REYQ72-456TTJU REYQ72-456TYDN R-410A

Transcription

1 Service Manual REYQ72-456TTJU REYQ72-456TYDN R-410A Heat Recovery 60 Hz

2 R-410A Heat Recovery 60 Hz ED Reference For items below, please refer to Engineering Data. No. Item ED No. Page Remarks 1 Specifications 2 Piping Diagrams 3 Option List EDUS R1 EDUS R2 ED R1 EDUS R2 EDUS R1 EDUS R2 P.2-7 P.2-7 P P P.116 P Safety Cautions... vi 1.1 Warnings and Cautions Regarding Safety of Workers...vi 1.2 Warnings and Cautions Regarding Safety of Users... viii 2. Used Icons... xi Part 1 General Information Model Names of Indoor/Outdoor Units Indoor Units Outdoor Units Air Treatment Equipment Branch Selector Unit External Appearance Indoor Units Outdoor Units Air Treatment Equipment Branch Selector Unit Combination of Outdoor Units REYQ-TYDN, REYQ-TTJU Interchangeability Capacity Range Combination Ratio Outdoor Unit Combinations Limitation of Capacity Index for Heat Recovery Part 2 Refrigerant Circuit Refrigerant Circuit REYQ72TYDN / REYQ72TTJU REYQ96-168TYDN / REYQ96-168TTJU i Table of Contents

3 1.3 Branch Selector Unit Functional Parts Functional Parts Layout REYQ72TYDN REYQ96 / 120TYDN REYQ144 / 168TYDN REYQ72TTJU REYQ96 / 120TTJU REYQ144 / 168TTJU Refrigerant Flow for Each Operation Mode REYQ72TYDN / REYQ72TTJU REYQ96-168TYDN / REYQ96-168TTJU Part 3 Remote Controller Wired Remote Controller Applicable Models Names and Functions MAIN/SUB Setting when Using 2 Remote Controllers Centralized Control Group No. Setting Wireless Remote Controller Applicable Models Names and Functions Address and MAIN/SUB Setting Service Mode BRC1E Part 4 Function and Control Function General Operation Mode Stop Control Standby Control Startup Control Basic Control List of Functions in Normal Operation Compressor PI Control Operating Priority and Rotation of Compressors Compressor Step Control PI Control Step Control of Outdoor Unit Fans Heat Exchanger Control Protection Control High Pressure Protection Control Low Pressure Protection Control Discharge Pipe Protection Control Inverter Protection Control Special Control Pump down Residual Operation Table of Contents ii

4 4.2 Oil Return Operation Defrost Operation Cooling / Heating Mode Switching Other Control Backup Operation Demand Operation Heating Operation Prohibition Outline of Control (Indoor Unit) Operation Flow Chart Thermostat Control Drain Pump Control Control of Freeze-up Prevention Heater Control (Optional PCB KRP1B... is required.) List of Swing Flap Operations Hot Start Control (In Heating Only) Louver Control for Preventing Ceiling Dirt Heater Control (FXTQ) Step Thermostat Processing (FXTQ) Interlocked with External Equipment (FXTQ) Part 5 Field Settings Test Operation Checks before Test Operation Test Operation Checks Field Setting from Remote Controller Wired Remote Controller Wireless Remote Controller Simplified Remote Controller Setting Contents and Code No. for Indoor Units Field Setting from Outdoor Unit Accessing the BS Buttons on the Logic Board Operating the BS Buttons and DIP Switches on the Logic Board Monitoring Function and Field Settings Cool / Heat Mode Changeover Setting of Low Night Noise Operation and Demand Operation Charging Refrigerant Precautions Calculating the Additional Refrigerant Charge Method for Adding Refrigerant Part 6 Service Diagnosis Symptom-based Troubleshooting Troubleshooting by Remote Controller iii Table of Contents

5 2.1 Mode Access Operation Procedure of Self-diagnosis by Remote Controller Error Code and Description Error Codes - Sub Codes Troubleshooting by Indication on the Remote Controller External Protection Device Abnormality PCB Abnormality Drain Level Control System (S1L) Abnormality Fan Motor (M1F) Lock, Overload Indoor Unit Fan Motor Abnormality Indoor Unit Fan Motor Abnormality Overload / Overcurrent / Lock of Indoor Unit Fan Motor Swing Flap Motor (M1S) Abnormality Power Supply Voltage Abnormality Coil Abnormality / Dust Clogging Coil Abnormality Drain Level above Limit Capacity Determination Device Abnormality Transmission Abnormality between Indoor Unit PCB and Fan PCB Thermistor Abnormality Combination Error between Indoor Unit PCB and Fan PCB Remote Sensor Abnormality Thermistor Abnormality Humidity Sensor System Abnormality Room Temperature Thermistor in Remote Controller Abnormality PCB Abnormality Actuation of High Pressure Switch Actuation of Low Pressure Sensor INV Compressor Motor Lock Compressor Damage Alarm Outdoor Unit Fan Motor Abnormality Coil Abnormality Discharge Pipe Temperature Abnormality Wet Alarm Refrigerant Overcharged Harness Abnormality (between Control PCB and Inverter PCB) Outdoor Unit Fan Motor Signal Abnormality Thermistor Abnormality High Pressure Sensor Abnormality Low Pressure Sensor Abnormality Inverter PCB Abnormality Reactor Temperature Rise Abnormality Inverter Radiation Fin Temperature Rise Abnormality INV Compressor Instantaneous Overcurrent INV Compressor Overcurrent INV Compressor Startup Abnormality Transmission Error between Inverter and Control PCB Power Supply Voltage Imbalance Table of Contents iv

6 3.44 Reactor Temperature Abnormality Inverter Radiation Fin Temperature Abnormality Field Setting after Replacing Outdoor Unit Main PCB Abnormality or Combination of PCB Abnormality Refrigerant Shortage Reverse Phase, Open Phase Power Supply Insufficient or Instantaneous Abnormality Check Operation is not Executed Transmission Error between Indoor Units and Outdoor Units Transmission Error between Remote Controller and Indoor Unit Transmission Error between Outdoor Units Transmission Error between Main and Sub Remote Controllers Transmission Error between Indoor and Outdoor Units in the Same System Improper Combination of Indoor and Outdoor Units, Indoor Units and Remote Controller Address Duplication of Centralized Control Equipment Transmission Error between Centralized Control Equipment and Indoor Unit System is not Set yet System Abnormality, Refrigerant System Address Undefined Check Part 7 Appendix Wiring Diagrams Outdoor Units Indoor Units v Table of Contents

7 Safety Cautions 1. Safety Cautions Be sure to read the following safety cautions before conducting repair work. After the repair work is complete, be sure to conduct a test operation to ensure that the equipment operates normally, and explain the cautions for operating the product to the customer. Caution Items The caution items are classified into Warning and Caution. The Warning items are especially important since they can lead to death or serious injury if they are not followed closely. The Caution items can also lead to serious accidents under some conditions if they are not followed. Therefore, be sure to observe all the safety caution items described below. Pictograms This symbol indicates the item for which caution must be exercised. The pictogram shows the item to which attention must be paid. This symbol indicates the prohibited action. The prohibited item or action is shown in the illustration or near the symbol. This symbol indicates the action that must be taken, or the instruction. The instruction is shown in the illustration or near the symbol. 1.1 Warnings and Cautions Regarding Safety of Workers Warning Do not store the equipment in a room with successive fire sources (e.g., naked flame, gas appliance, electric heater). Be sure to disconnect the power cable plug from the plug socket before disassembling the equipment for repair. Working on the equipment that is connected to the power supply may cause an electrical shock. If it is necessary to supply power to the equipment to conduct the repair or inspecting the circuits, do not touch any electrically charged sections of the equipment. If the refrigerant gas is discharged during the repair work, do not touch the discharged refrigerant gas. The refrigerant gas may cause frostbite. When disconnecting the suction or discharge pipe of the compressor at the welded section, evacuate the refrigerant gas completely at a wellventilated place first. If there is gas remaining inside the compressor, the refrigerant gas or refrigerating machine oil discharges when the pipe is disconnected, and it may cause injury. If the refrigerant gas leaks during the repair work, ventilate the area. The refrigerant gas may generate toxic gases when it contacts flames. Be sure to discharge the capacitor completely before conducting repair work. The step-up capacitor supplies high-voltage electricity to the electrical components of the outdoor unit. A charged capacitor may cause an electrical shock. vi

8 Safety Cautions SiUS341504E Warning Do not start or stop the air conditioner operation by plugging or unplugging the power cable plug. Plugging or unplugging the power cable plug to operate the equipment may cause an electrical shock or fire. Be sure to wear a safety helmet, gloves, and a safety belt when working at a high place (more than 2 m (6.5 ft)). Insufficient safety measures may cause a fall accident. In case of R-32 / R-410A refrigerant models, be sure to use pipes, flare nuts and tools for the exclusive use of the R-32 / R-410A refrigerant. The use of materials for R-22 refrigerant models may cause a serious accident such as a damage of refrigerant cycle as well as an equipment failure. Do not mix air or gas other than the specified refrigerant (R-32 / R-410A / R-22) in the refrigerant system. If air enters the refrigerating system, an excessively high pressure results, causing equipment damage and injury. Caution Do not repair the electrical components with wet hands. Working on the equipment with wet hands may cause an electrical shock. Do not clean the air conditioner by splashing water. Washing the unit with water may cause an electrical shock. Be sure to provide the earth / grounding when repairing the equipment in a humid or wet place, to avoid electrical shocks. Be sure to turn off the power switch and unplug the power cable when cleaning the equipment. The internal fan rotates at a high speed, and may cause injury. Be sure to conduct repair work with appropriate tools. The use of inappropriate tools may cause injury. vii

9 Safety Cautions Caution Be sure to check that the refrigerating cycle section has cooled down enough before conducting repair work. Working on the unit when the refrigerating cycle section is hot may cause burns. Use the welder in a well-ventilated place. Using the welder in an enclosed room may cause oxygen deficiency. 1.2 Warnings and Cautions Regarding Safety of Users Warning Do not store the equipment in a room with successive fire sources (e.g., naked flame, gas appliance, electric heater). Be sure to use parts listed in the service parts list of the applicable model and appropriate tools to conduct repair work. Never attempt to modify the equipment. The use of inappropriate parts or tools may cause an electrical shock, excessive heat generation or fire. If the power cable and lead wires have scratches or deteriorated, be sure to replace them. Damaged cable and wires may cause an electrical shock, excessive heat generation or fire. Do not use a joined power cable or extension cable, or share the same power outlet with other electrical appliances, since it may cause an electrical shock, excessive heat generation or fire. Be sure to use an exclusive power circuit for the equipment, and follow the local technical standards related to the electrical equipment, the internal wiring regulations, and the instruction manual for installation when conducting electrical work. Insufficient power circuit capacity and improper electrical work may cause an electrical shock or fire. Be sure to use the specified cable for wiring between the indoor and outdoor units. Make the connections securely and route the cable properly so that there is no force pulling the cable at the connection terminals. Improper connections may cause excessive heat generation or fire. viii

10 Safety Cautions SiUS341504E Warning When wiring between the indoor and outdoor units, make sure that the terminal cover does not lift off or dismount because of the cable. If the cover is not mounted properly, the terminal connection section may cause an electrical shock, excessive heat generation or fire. Do not damage or modify the power cable. Damaged or modified power cable may cause an electrical shock or fire. Placing heavy items on the power cable, and heating or pulling the power cable may damage the cable. Do not mix air or gas other than the specified refrigerant (R-32 / R-410A / R-22) in the refrigerant system. If air enters the refrigerating system, an excessively high pressure results, causing equipment damage and injury. If the refrigerant gas leaks, be sure to locate the leaking point and repair it before charging the refrigerant. After charging refrigerant, make sure that there is no refrigerant leak. If the leaking point cannot be located and the repair work must be stopped, be sure to perform pump-down and close the service, to prevent the refrigerant gas from leaking into the room. The refrigerant gas itself is harmless, but it may generate toxic gases when it contacts flames, such as fan and other heaters, stoves and ranges. When relocating the equipment, make sure that the new installation site has sufficient strength to withstand the weight of the equipment. If the installation site does not have sufficient strength and if the installation work is not conducted securely, the equipment may fall and cause injury. Check to make sure that the power cable plug is not dirty or loose, then insert the plug into a power outlet securely. If the plug has dust or loose connection, it may cause an electrical shock or fire. Be sure to install the product correctly by using the provided standard installation frame. Incorrect use of the installation frame and improper installation may cause the equipment to fall, resulting in injury. For unitary type only Be sure to install the product securely in the installation frame mounted on the window frame. If the unit is not securely mounted, it may fall and cause injury. For unitary type only When replacing the coin battery in the remote controller, be sure to dispose of the old battery to prevent children from swallowing it. If a child swallows the coin battery, see a doctor immediately. ix

11 Safety Cautions Caution Installation of a leakage breaker is necessary in some cases depending on the conditions of the installation site, to prevent electrical shocks. Do not install the equipment in a place where there is a possibility of combustible gas leaks. If the combustible gas leaks and remains around the unit, it may cause a fire. Check to see if the parts and wires are mounted and connected properly, and if the connections at the soldered or crimped terminals are secure. Improper installation and connections may cause excessive heat generation, fire or an electrical shock. If the installation platform or frame has corroded, replace it. Corroded installation platform or frame may cause the unit to fall, resulting in injury. Check the earth / grounding, and repair it if the equipment is not properly earthed / grounded. Improper earth / grounding may cause an electrical shock. Be sure to measure the insulation resistance after the repair, and make sure that the resistance is 1 MΩ or higher. Faulty insulation may cause an electrical shock. Be sure to check the drainage of the indoor unit after the repair. Faulty drainage may cause the water to enter the room and wet the furniture and floor. Do not tilt the unit when removing it. The water inside the unit may spill and wet the furniture and floor. Be sure to install the packing and seal on the installation frame properly. If the packing and seal are not installed properly, water may enter the room and wet the furniture and floor. For unitary type only x

12 Used Icons SiUS341504E 2. Used Icons The following icons are used to attract the attention of the reader to specific information. Icon Type of Information Warning Description A Warning is used when there is danger of personal injury. Warning Caution Note: Caution Note Reference A Caution is used when there is danger that the reader, through incorrect manipulation, may damage equipment, lose data, get an unexpected result or has to restart (part of) a procedure. A Note provides information that is not indispensable, but may nevertheless be valuable to the reader, such as tips and tricks. A Reference guides the reader to other places in this binder or in this manual, where he/she will find additional information on a specific topic. xi

13 Part 1 General Information 1. Model Names of Indoor/Outdoor Units Indoor Units Outdoor Units Air Treatment Equipment Branch Selector Unit External Appearance Indoor Units Outdoor Units Air Treatment Equipment Branch Selector Unit Combination of Outdoor Units REYQ-TYDN, REYQ-TTJU Interchangeability Capacity Range Combination Ratio Outdoor Unit Combinations Limitation of Capacity Index for Heat Recovery General Information 1

14 Model Names of Indoor/Outdoor Units 1. Model Names of Indoor/Outdoor Units 1.1 Indoor Units VJ : 1 phase, 208/230 V, 60 Hz U(VJU) : Standard Symbol 1.2 Outdoor Units REYQ-TYDN, REYQ-TTJU YD(N) : 3 phase, 460 V, 60 Hz TJ : 3 phase, 208/230 V, 60 Hz U(TJU) : Standard Symbol SiUS341504E Capacity Range 0.6 ton 0.8 ton 1 ton 1.25 ton 1.5 ton 2 ton 2.5 ton 3 ton 3.5 ton 4 ton 4.5 ton 6 ton 8 ton Power Supply, Capacity Index Standard Ceiling Mounted Cassette (Round Flow with Sensing) FXFQ 07T 09T 12T 15T 18T 24T 30T 36T 48T Type VJU Ceiling Mounted Cassette (Round Flow) Type FXFQ 09P 12P 18P 24P 30P 36P 48P 4 Way Ceiling Mounted Cassette (2' 2') Type FXZQ 07M 09M 12M 15M 18M VJU9 Slim Ceiling Mounted Duct Type FXDQ 07M 09M 12M 18M 24M Ceiling Mounted Duct Type (Middle and High Static Pressure) FXMQ 07PB 09PB 12PB 15PB 18PB 24PB 30PB 36PB 48PB 54PB Ceiling Mounted Duct Type FXMQ 72M 96M Ceiling Suspended Type FXHQ 12M 24M 36M VJU Wall Mounted Type FXAQ 07P 09P 12P 18P 24P 4-Way Blow Ceiling-Suspended Type FXUQ 18P 24P 30P 36P Floor Standing Type FXLQ 07M 09M 12M 18M 24M Concealed Floor Standing Type FXNQ 07M 09M 12M 18M 24M Vertical Air Handling Unit FXTQ 12PA 18PA 24PA 30PA 36PA 42PA 48PA 54PA Capacity Range 6 ton 8 ton 10 ton 12 ton 14 ton 16 ton 18 ton 20 ton 22 ton Power Supply, Capacity Index Standard Heat Recovery 460 V REYQ- 72T 96T 120T 144T 168T 192T 216T 240T 264T YDN 208/230 V REYQ- 72T 96T 120T 144T 168T 192T 216T 240T 264T TJU Capacity Range 24 ton 26 ton 28 ton 30 ton 32 ton 34 ton 36 ton 38 ton Power Supply, Capacity Index Standard Heat Recovery 460 V REYQ- 288T 312T 336T 360T 384T 408T 432T 456T YDN 208/230 V REYQ- 288T 312T 336T 360T 384T 408T 432T 456T TJU 2 General Information

15 Model Names of Indoor/Outdoor Units Combination of Outdoor Units (Heat Recovery 460 V) REYQ-TYDN Model name REYQ72TYDN REYQ96TYDN REYQ120TYDN REYQ144TYDN REYQ168TYDN Outdoor unit 1 REYQ72TYDN REYQ96TYDN REYQ120TYDN REYQ144TYDN REYQ168TYDN Model name REYQ192TYDN REYQ216TYDN REYQ240TYDN REYQ264TYDN REYQ288TYDN Outdoor unit 1 REYQ72TYDN REYQ96TYDN REYQ96TYDN REYQ120TYDN REYQ144TYDN Outdoor unit 2 REYQ120TYDN REYQ120TYDN REYQ144TYDN REYQ144TYDN REYQ144TYDN Model name REYQ312TYDN REYQ336TYDN REYQ360TYDN REYQ384TYDN REYQ408TYDN Outdoor unit 1 REYQ144TYDN REYQ168TYDN REYQ120TYDN REYQ96TYDN REYQ96TYDN Outdoor unit 2 REYQ168TYDN REYQ168TYDN REYQ120TYDN REYQ120TYDN REYQ144TYDN Outdoor unit 3 REYQ120TYDN REYQ168TYDN REYQ168TYDN Model name REYQ432TYDN REYQ456TYDN Outdoor unit 1 REYQ144TYDN REYQ144TYDN Outdoor unit 2 REYQ144TYDN REYQ144TYDN Outdoor unit 3 REYQ144TYDN REYQ168TYDN Combination of Outdoor Units (Heat Recovery 208/230 V) REYQ-TTJU Model name REYQ72TTJU REYQ96TTJU REYQ120TTJU REYQ144TTJU REYQ168TTJU Outdoor unit 1 REYQ72TTJU REYQ96TTJU REYQ120TTJU REYQ144TTJU REYQ168TTJU Model name REYQ192TTJU REYQ216TTJU REYQ240TTJU REYQ264TTJU REYQ288TTJU Outdoor unit 1 REYQ72TTJU REYQ96TTJU REYQ96TTJU REYQ120TTJU REYQ144TTJU Outdoor unit 2 REYQ120TTJU REYQ120TTJU REYQ144TTJU REYQ144TTJU REYQ144TTJU Model name REYQ312TTJU REYQ336TTJU REYQ360TTJU REYQ384TTJU REYQ408TTJU Outdoor unit 1 REYQ144TTJU REYQ168TTJU REYQ120TTJU REYQ96TTJU REYQ96TTJU Outdoor unit 2 REYQ168TTJU REYQ168TTJU REYQ120TTJU REYQ120TTJU REYQ144TTJU Outdoor unit 3 REYQ120TTJU REYQ168TTJU REYQ168TTJU Model name REYQ432TTJU REYQ456TTJU Outdoor unit 1 REYQ144TTJU REYQ144TTJU Outdoor unit 2 REYQ144TTJU REYQ144TTJU Outdoor unit 3 REYQ144TTJU REYQ168TTJU General Information 3

16 Model Names of Indoor/Outdoor Units SiUS341504E 1.3 Air Treatment Equipment Outdoor Air Processing Unit Series Model Name Power Supply, Standard FXMQ 48MF 72MF 96MF VJU Energy Recovery Ventilator (VAM series) Series Model Name Power Supply, Standard VAM 300G 470G 600G 1200G VJU VJ : 1 phase, 208/230 V, 60 Hz U(VJU) : Standard Symbol 1.4 Branch Selector Unit Single Branch Selector Unit for Heat Recovery Series Model Name Power Supply, Standard Heat Recovery BSQ 36T 60T 96T VJ Note: No interchangeability with BSVQ36/60/96PVJU. VJ: 1 phase, 208/230 V, 60 Hz Multi Branch Selector Unit for Heat Recovery Series Model Name Power Supply, Standard Heat Recovery BS 4Q54T 6Q54T 8Q54T 10Q54T 12Q54T VJ Note: No interchangeability with BSV4/6Q36PVJU. VJ: 1 phase, 208/230 V, 60 Hz 4 General Information

17 SiUS341504E External Appearance 2. External Appearance 2.1 Indoor Units Ceiling mounted cassette (Round flow with sensing) type FXFQ-T Ceiling suspended type FXHQ-M Shown with BYCQ125B-W1 Ceiling mounted cassette (Round flow) type FXFQ-P Wall mounted type FXAQ-P Shown with BYCP125K-W1 4 way ceiling mounted cassette (2 2 ) type FXZQ-M 4-way blow ceiling-suspended type FXUQ-P Shown with BYFQ60B8W1U Slim ceiling mounted duct type FXDQ-M Ceiling mounted duct type (Middle and high static pressure) FXMQ-PB Ceiling mounted duct type FXMQ-M General Information Floor standing type FXLQ-M Concealed floor standing type FXNQ-M Vertical air handling unit FXTQ-PA 5

18 External Appearance SiUS341504E 2.2 Outdoor Units REYQ-TYDN, REYQ-TTJU Single Outdoor Units REYQ72TYDN REYQ72TTJU REYQ96 / 120 / 144 / 168TYDN REYQ96 / 120 / 144 / 168TTJU Double Outdoor Units REYQ192TYDN REYQ192TTJU REYQ216 / 240 / 264 / 288 / 312 / 336TYDN REYQ216 / 240 / 264 / 288 / 312 / 336TTJU Triple Outdoor Units REYQ360 / 384 / 408 / 432 / 456TYDN REYQ360 / 384 / 408 / 432 / 456TTJU 6 General Information

19 External Appearance 2.3 Air Treatment Equipment Outdoor air processing unit FXMQ-MF Energy recovery ventilator (VAM series) VAM-G 2.4 Branch Selector Unit Single branch selector unit BSQ-T Multi branch selector unit BS-Q54TVJ General Information 7

20 Combination of Outdoor Units 3. Combination of Outdoor Units 3.1 REYQ-TYDN, REYQ-TTJU System capacity Number of Module Ton HP kw units Outdoor Unit Multi Connection Piping Kit Note: 1 For multiple connection, the outdoor unit multi connection piping kit (separately sold) is required. BHFP26P100U BHFP26P151U SiUS341504E 8 General Information

21 Interchangeability 4. Interchangeability Outdoor unit Heat Recovery REYQ-T Branch Selector unit New Branch Selector unit Single Branch Selector unit BSQ36TVJ BSQ60TVJ BSQ96TVJ Multi Branch Selector unit BS4Q54TVJ BS6Q54TVJ BS8Q54TVJ BS10Q54TVJ BS12Q54TVJ (Reference) Current Branch Selector unit Single Branch Selector unit BSVQ36PVJU BSVQ60PVJU BSVQ96PVJU Multi Branch Selector unit BSV4Q36PVJU BSV6Q36PVJU REYQ-TYDN Connectable Connectable Not connectable Not connectable REYQ-TTJU Connectable Connectable Not connectable Not connectable General Information 9

22 Capacity Range 5. Capacity Range 5.1 Combination Ratio SiUS341504E Combination ratio = Total capacity index of the indoor units Capacity index of the outdoor units Type Single outdoor units Double outdoor units Min. combination ratio Types of connected indoor units When using only FXDQ, FXMQ-PB, FXAQ When using only FXTQ, or at least one FXFQ07 or FXFQ09 50% 200% 1 130% Max. combination ratio Other indoor unit models 200% 1 160% 1 Type of connected air treatment equipments When FXMQ-MF is only connected FXMQ-MF When FXMQ-MF and indoor units are connected 100% 100% 2 Triple outdoor units 130% Notes: 1. If the operational capacity of indoor units is more than 130%, low airflow operation is enforced in all the indoor units. Refer to P.128 for detail. 2. When outdoor-air processing units (FXMQ-MF) and standard indoor units are connected, the total connection capacity of the outdoor-air processing units (FXMQ-MF) must not exceed 30% of the capacity index of the outdoor units. And the connection ratio must not exceed 100%. 5.2 Outdoor Unit Combinations REYQ-TYDN, REYQ-TTJU Capacity Range 6 ton 8 ton 10 ton 12 ton 14 ton 16 ton 18 ton 20 ton 22 ton REYQ Max. Number of Connectable Indoor Units Total Capacity Index of Indoor Units to be Connected 1 72TYDN 72TTJU 96TYDN 96TTJU 120TYDN 120TTJU 144TYDN 144TTJU 168TYDN 168TTJU 192TYDN 192TTJU 216TYDN 216TTJU 240TYDN 240TTJU 264TYDN 264TTJU ~93 (144) 48~124 (192) 60~156 (240) 72~187 (288) 84~218 (336) 96~249 (307) 108~280 (346) 120~312 (384) Capacity Range 24 ton 26 ton 28 ton 30 ton 32 ton 34 ton 36 ton 38 ton REYQ Max. Number of Connectable Indoor Units Total Capacity Index of Indoor Units to be Connected 1 Note: 288TYDN 288TTJU 312TYDN 312TTJU 336TYDN 336TTJU 360TYDN 360TTJU 384TYDN 384TTJU 408TYDN 408TTJU 432TYDN 432TTJU 456TYDN 456TTJU ~374 (461) 156~405 (499) 168~436 (538) 180~468 (468) 192~499 (499) 204~530 (530) 216~561 (561) 228~592 (592) 132~343 (422) 1. Values inside brackets are based on connection of indoor units rated at maximum capacity, 200% for single outdoor units, 160% for double outdoor units, and 130% for triple outdoor units. 10 General Information

23 Capacity Range 5.3 Limitation of Capacity Index for Heat Recovery Single Branch Selector unit Model BSQ36TVJ BSQ60TVJ BSQ96TVJ Maximum number of connectable indoor units Total capacity index of connectable indoor units 36 or less More than 36 and 60 or less More than 60 and 96 or less Multi Branch Selector unit Model BS4Q54TVJ BS6Q54TVJ BS8Q54TVJ BS10Q54TVJ BS14Q54TVJ Maximum number of connectable indoor units per branch Number of branches Maximum capacity index of connectable indoor units 144 or less 216 or less 290 or less 290 or less 290 or less Maximum capacity index of connectable indoor units per branch ( 1) 54 or less 54 or less 54 or less 54 or less 54 or less Note: 1. When the total capacity of indoor units to be connected downstream is larger than 54 (Max. 96), use a junction pipe kit (KHRP26A250T, optional parts) to join 2 connections downstream from the Branch Selector unit. Heat Recovery High and low pressure gas piping Suction gas piping Liquid piping Outdoor unit Branch Selector unit Branch Selector unit Indoor unit (Heating) Indoor unit (Cooling) Indoor unit (Cooling only) Heat Recovery operation! For indoor units used for cooling only (do not connect to Branch Selector unit when using for Heat Recovery), total capacity index must be 50% or less than the capacity index of the outdoor units. General Information 11

24 Part 2 Refrigerant Circuit 1. Refrigerant Circuit REYQ72TYDN / REYQ72TTJU REYQ96-168TYDN / REYQ96-168TTJU Branch Selector Unit Functional Parts Functional Parts Layout REYQ72TYDN REYQ96 / 120TYDN REYQ144 / 168TYDN REYQ72TTJU REYQ96 / 120TTJU REYQ144 / 168TTJU Refrigerant Flow for Each Operation Mode REYQ72TYDN / REYQ72TTJU REYQ96-168TYDN / REYQ96-168TTJU Refrigerant Circuit

25 Refrigerant Circuit 1. Refrigerant Circuit 1.1 REYQ72TYDN / REYQ72TTJU No. in refrigerant system diagram Electric symbol Name (1) M1C Inverter compressor (INV) (2) M1F Inverter fan (3) Y1E (4) Y2E (5) Y3E (6) Y4E (7) Y5E (8) Y6E expansion (Heat exchanger upper) expansion (Subcooling heat exchanger) expansion (Heat exchanger lower) expansion (Receiver gas purge) expansion (Refrigerant cooling) expansion (Leak detection) Major function Inverter compressor is operated on frequencies between 52 Hz to 210 Hz by using the inverter. Compressor operation steps: Refer to P.60~ Because the system is an air heat exchange type, the fan is operated at 9-step rotation speed by using the inverter. While in heating, PI control is applied to keep the outlet superheated degree of air heat exchanger constant. PI control is applied to keep the outlet superheated degree of subcooling heat exchanger constant. While in heating, PI control is applied to keep the outlet superheated degree of air heat exchanger constant. Used to collect the refrigerant to receiver. Used to control the refrigerant amount to cool the diode bridge and power module of the inverter PCB. Used to detect refrigerant leakage. (9) Y1S Solenoid (OS oil return) Used to return oil from the oil separator to the compressor. (10) Y3S Solenoid (Liquid shutoff) Used to return oil from the accumulator to the compressor. (11) Y4S Four way (HP/LP gas) Used to switch dual pressure gas pipe to high pressure or low pressure. (12) Y5S Four way (Heat exchanger lower) (13) Y6S Four way (Heat exchanger upper) Used to switch outdoor unit heat exchanger to evaporator or condenser. (14) S1NPH High pressure sensor Used to detect the high pressure. (15) S1NPL Low pressure sensor Used to detect the low pressure. (16) S1PH (17) High pressure switch (For INV compressor) Pressure regulating (Liquid pipe) This functions when pressure increases to stop operation and avoid high pressure increase in the fault operation. This is used when pressure increases, to prevent any damage on components caused by pressure increase in transport or storage. (18) Subcooling heat exchanger Apply subcooling to liquid refrigerant. (19) Capillary tube Used to return the refrigerating oil separated through the oil separator to the INV compressor. (20) R1T Thermistor (Outdoor air) Used to detect outdoor air temperature, correct discharge pipe temperature and others. (21) R2T Thermistor (M1C discharge) Used to detect discharge pipe temperature. (22) R3T Thermistor (Receiver inlet) Used to detect liquid pipe temperature of receiver inlet. (23) R4T Thermistor (Heat exchanger liquid upper) (24) R5T Thermistor (Heat exchanger liquid lower) This detects temperature of liquid pipe for air heat exchanger. (25) R6T Thermistor (Subcooling gas) Used to detect outdoor air temperature, correct discharge pipe temperature and others. (26) R7T Thermistor (Subcooling liquid) This detects temperature of liquid pipe for subcooling heat exchanger. (27) R8T Thermistor (Heat exchanger gas upper) (28) R9T Thermistor (Heat exchanger gas lower) This detects temperature of gas pipe for air heat exchanger. (29) R10T Thermistor (Suction) Used to detect suction pipe temperature. (30) R11T Thermistor (Deicer) Used to detect liquid pipe temperature of air heat exchanger. Used to make judgements on defrosting operation. (31) R12T Thermistor (Comp. suction) Used to detect suction pipe temperature of compressor. (32) R13T Thermistor (Receiver gas purge) Used to detect gas pipe temperature of receiver gas purge piping. (33) R14T Thermistor (M1C body) Detects compressor surface temperature, this switch is activated at surface temperature of 120 C (248 F) or more to stop the compressor. (34) R15T Thermistor (Leak detection) The thermistor detects refrigerant leakage. U Refrigerant Circuit 13

26 Refrigerant Circuit SiUS341504E REYQ72TYDN / REYQ72TTJU Check (26) Check (25) (13) Four way S1NPL Check SV (2) Fan M S1NPH S1PH SV Liquid pipe High/low pressure gas pipe Suction gas pipe Stop (With service port φ5/16in. (7.9mm) flare connection) expansion (4) expansion (6) Double tube heat exchanger (18) Capillary tube Check Liquid Receiver (12) Four way Double tube heat exchanger (11) Four way (32) (15) Low pressure sensor Capillary tube Charge port (29) Accumulator Fusible plug Check (22) Solenoid (10) expansion (8) Fusible plug (27) Pressure regulating (28) (17) (30) Check (23) (24) Check expansion (3) Capillary tube (5) expansion (7) Heat sink expansion (20) High pressure sensor (14) Check High pressure switch (16) (21) Oil separator (33) Compressor INV (1) (31) Solenoid (9) Capillary tube (19) C: 3D Refrigerant Circuit

27 Refrigerant Circuit 1.2 REYQ96-168TYDN / REYQ96-168TTJU No. in refrigerant system diagram Electric symbol Name Major function (1) M1C Inverter compressor (INV 1) Inverter compressor is operated on frequencies between 52 Hz to 210 Hz by using the (2) M2C Inverter compressor (INV 2) inverter. Compressor operation steps: Refer to P.60~ (3) M1F (4) M2F Inverter fan Because the system is an air heat exchange type, the fan is operated at 9-step rotation speed by using the inverter. (5) Y1E expansion (Heat exchanger upper) While in heating, PI control is applied to keep the outlet superheated degree of air heat exchanger constant. (6) Y2E expansion (Subcooling heat exchanger) PI control is applied to keep the outlet superheated degree of subcooling heat exchanger constant. (7) Y3E expansion (Heat exchanger lower) While in heating, PI control is applied to keep the outlet superheated degree of air heat exchanger constant. (8) Y4E expansion (Receiver gas purge) Used to collect the refrigerant to receiver. (9) Y5E expansion (Refrigerant cooling) Used to control the refrigerant amount to cool the diode bridge and power module of the inverter PCB. (10) Y6E expansion (Leak detection) Used to detect refrigerant leakage. (11) Y1S Solenoid (OS oil return 1) Used to return oil from the oil separator to the compressor (M1C). (12) Y2S Solenoid (OS oil return 2) Used to return oil from the oil separator to the compressor (M2C). (13) Y3S Solenoid (Liquid shutoff) Used to return oil from the accumulator to the compressor. (14) Y4S Four way (HP/LP gas) Used to switch dual pressure gas pipe to high pressure or low pressure. (15) Y5S Four way (Heat exchanger lower) (16) Y6S Four way (Heat exchanger upper) Used to switch outdoor unit heat exchanger to evaporator or condenser. (17) S1NPH High pressure sensor Used to detect the high pressure. (18) S1NPL Low pressure sensor Used to detect the low pressure. (19) S1PH High pressure switch (For INV 1 compressor) This functions when pressure increases to stop operation and avoid high pressure (20) S2PH High pressure switch increase in the fault operation. (For INV 2 compressor) (21) Pressure regulating (Liquid pipe) This is used when pressure increases, to prevent any damage on components caused by pressure increase in transport or storage. (22) Subcooling heat exchanger Apply subcooling to liquid refrigerant. (23) Capillary tube Used to return the refrigerating oil separated through the oil separator to the INV 1 compressor. (24) Capillary tube Used to return the refrigerating oil separated through the oil separator to the INV 2 compressor. (25) R1T Thermistor (Outdoor air) Used to detect outdoor air temperature, correct discharge pipe temperature and others. (26) R21T Thermistor (M1C discharge) (27) R22T Thermistor (M2C discharge) Used to detect discharge pipe temperature. (28) R3T Thermistor (Receiver inlet) Used to detect liquid pipe temperature of receiver inlet. (29) R4T Thermistor (Heat exchanger liquid upper) (30) R5T Thermistor (Heat exchanger liquid lower) This detects temperature of liquid pipe for air heat exchanger. (31) R6T Thermistor (Subcooling gas) Used to detect gas pipe temperature on the evaporating side of subcooling heat exchanger. Used to exercise the constant control of superheated degree at the outlet of subcooling heat exchanger. (32) R7T Thermistor (Subcooling liquid) This detects temperature of liquid pipe for subcooling heat exchanger. (33) R8T Thermistor (Heat exchanger gas upper) (34) R9T Thermistor (Heat exchanger gas lower) This detects temperature of gas pipe for air heat exchanger. (35) R10T Thermistor (Suction) Used to detect suction pipe temperature. (36) R11T Thermistor (Deicer) Used to detect liquid pipe temperature of air heat exchanger. Used to make judgements on defrosting operation. (37) R12T Thermistor (Comp. suction) Used to detect suction pipe temperature of compressor. (38) R13T Thermistor (Receiver gas purge) Used to detect gas pipe temperature of receiver gas purge piping. (39) R14T Thermistor (M2C body) Detects compressor surface temperature, this switch is activated at surface temperature of 120 C (248 F) or more to stop the compressor. (144/168 class models only) (40) R15T Thermistor (Leak detection) The thermistor detects refrigerant leakage. Refrigerant Circuit 15

28 Refrigerant Circuit SiUS341504E REYQ96-168TYDN / REYQ96-168TTJU Stop (With service port φ5/16in. (7.9mm) flare connection) Check (32) Check Solenoid SV (13) Check Receiver Pressure regulating (4) (3) Fusible Fan Fan plug (29) (21) M M Four way S1NPH S2PH S1PH (27) SV Liquid pipe High/low pressure gas pipe Suction gas pipe Check (28) Check expansion expansion (6) Double tube heat exchanger (31) (22) (8) Capillary tube Check (16) Four way (33) (36) (30) expansion (8) Check (5) (7) Capillary tube expansion (34) expansion (9) (15) expansion Heat sink (14) Lows pressure sensor (18) S1NPL Four way Double tube heat exchanger Capillary tube Charge port High pressure switch High pressure sensor Compressor INV 2 Solenoid Check Oil Separator Capillary tube (24) High pressure switch Compressor INV 1 Solenoid Check Oil Separator SV (35) (38) (39) (20) (17) (2) (12) (19) (26) (1) (11) Capillary tube (23) (25) Accumulator Fusible plug (37) C: 3D Refrigerant Circuit

29 Refrigerant Circuit 1.3 Branch Selector Unit Functional Parts Single Branch Selector Unit BSQ36-96TVJ No. Name Electric symbol 1 expansion (EVH) Y2E Note: Factory setting of all EV opening: 60 pulse Function Opens while in heating operation or all indoor units are in cooling. (Max : 760 pulse) 2 expansion (EVL) Y3E Opens while in cooling. (Max : 760 pulse) 3 expansion (EVSC) Y1E In simultaneous cooling and heating operation, it is used to subcooling liquid refrigerants when an indoor unit downstream of this Branch Selector unit is in heating. (Max : 480 pulse) Liquid pipe connection port Liquid pipe connection port Double pipe heat exchanger (EVSC) (3) Gas pipe connection port (EVH) (1) HP/LP gas pipe connection port (EVL) (2) Suction gas pipe connection port 4D085545A Refrigerant Circuit 17

30 Refrigerant Circuit SiUS341504E Multi Branch Selector Unit BS4Q54TVJ Liquid pipe connection port Suction gas pipe connection port HP/LP gas pipe connection port D unit B unit C unit A unit Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port (1) (HP/LP gas) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (1) (HP/LP gas) (Suction) (2) (HP/LP gas) (1) (Suction) (2) Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger (3) (Subcooling) (3) (Subcooling) (3) (Subcooling) (3) (Subcooling) 3D086032A 18 Refrigerant Circuit

31 Refrigerant Circuit BS6Q54TVJ Liquid pipe connection port Suction gas pipe connection port HP/LP gas pipe connection port F unit Gas pipe connection port Liquid pipe connection port (HP/LP gas) (1) (Suction) Double pipe heat (Subcooling) exchanger (2) (3) E unit Gas pipe connection port Liquid pipe connection port (HP/LP gas) (1) (Suction) (2) Double pipe heat (Subcooling) exchanger (3) D unit Gas pipe connection port Liquid pipe connection port (HP/LP gas) (1) (Suction) (2) Double pipe heat (Subcooling) exchanger (3) C unit Gas pipe connection port Liquid pipe connection port (HP/LP gas) (1) (Suction) (2) Double pipe heat (Subcooling) exchanger (3) B unit A unit Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) Double pipe heat (Subcooling) exchanger (3) Double pipe heat (Subcooling) exchanger (3) 3D086033A Refrigerant Circuit 19

32 Refrigerant Circuit SiUS341504E BS8Q54TVJ Liquid pipe connection port Suction gas pipe connection port HP/LP gas pipe connection port H unit G unit F unit E unit D unit C unit B unit A unit Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger (Subcooling) (Subcooling) (Subcooling) (Subcooling) (Subcooling) (Subcooling) (Subcooling) (HP/LP gas) (1) Double pipe heat (Suction) (Subcooling) exchanger (2) (3) (3) (3) (3) (3) (3) (3) (3) 3D086034A 20 Refrigerant Circuit

33 Refrigerant Circuit BS10Q54TVJ Liquid pipe connection port Suction gas pipe connection port HP/LP gas pipe connection port J unit I unit H unit G unit F unit E unit D unit C unit B unit A unit Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) Double pipe heat (Suction) (Subcooling) exchanger (2) (3) Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger (Subcooling) (3) (Subcooling) (3) (Subcooling) (3) (Subcooling) (3) (Subcooling) (3) (Subcooling) (3) (Subcooling) (3) (Subcooling) (3) (Subcooling) (3) 3D086035A Refrigerant Circuit 21

34 Refrigerant Circuit SiUS341504E BS12Q54TVJ Liquid pipe connection port Suction gas pipe connection port HP/LP gas pipe connection port L unit K unit J unit I unit H unit G unit F unit E unit D unit C unit B unit A unit Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port Gas pipe connection port Liquid pipe connection port (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (HP/LP gas) (1) (Suction) (2) (Subcooling) (3) (Subcooling) (3) (Subcooling) (3) (Subcooling) (3) (Subcooling) (3) (Subcooling) (3) (Subcooling) (3) (Subcooling) (3) (Subcooling) (3) (Subcooling) (3) (HP/LP gas) (1) Double pipe heat (Suction) (Subcooling) exchanger (2) (3) Double pipe heat (Subcooling) exchanger (3) Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger 3D086036A 22 Refrigerant Circuit

35 2. Functional Parts Layout 2.1 REYQ72TYDN Plane View expansion (Refrigerant cooling) (Y5E) expansion (Subcooling heat exchanger) (Y2E) Four way (Heat exchanger lower) (Y5S) Four way (Heat exchanger upper) (Y6S) Thermistor (Heat exchanger gas lower) (R9T) Thermistor (Heat exchanger gas upper) (R8T) Four way (HP/LP gas) (Y4S) Solenoid (Liquid shutoff) (Y3S) Solenoid (DS oil return) (Y1S) Thermistor (Suction) (R10T) Thermistor (M1C discharge) (R2T) Functional Parts Layout Front View Fan motor (M1F) High pressure sensor (S1NPH) High pressure switch (S1PH) Thermistor (Compressor suction) (R12T) Low pressure sensor (S1NPL) Thermistor (Receiver gas purge) (R13T) Thermistor (Deicer) (R11T) Crankcase heater (E1HC) Thermistor (M1C body) (R14T) Compressor (INV) (M1C) C: 1P385179A Refrigerant Circuit 23

36 Functional Parts Layout 2.2 REYQ96 / 120TYDN Plane View expansion (Refrigerant cooling) (Y5E) expansion (Subcooling heat exchanger) (Y2E) Four way (Heat exchanger upper) (Y6S) Four way (Heat exchanger lower) (Y5S) Thermistor (Heat exchanger gas upper) (R8T) Thermistor (Suction) (R10T) SiUS341504E Solenoid (Liquid shutoff) (Y3S) Solenoid (DS oil return 2) (Y2S) Solenoid (DS oil return 1) (Y1S) High pressure sensor (S1NPH) Thermistor (M1C discharge) (R21T) Thermistor (M2C discharge) (R22T) Front View Thermistor (Outdoor air) (R1T) Fan motor (M2F) Fan motor (M1F) Thermistor (Heat exchanger gas lower) (R9T) High pressure switch (S2PH) Four way (HP/LP gas) (Y4S) High pressure switch (S1PH) Thermistor (Compressor suction) (R12T) Low pressure sensor (S1NPL) Thermistor (Receiver gas purge) (R13T) expansion (Heat exchanger upper) (Y1E) expansion (Heat exchanger lower) (Y3E) Thermistor (Deicer) (R11T) Crankcase heater (E2HC) Compressor (INV 2) (M2C) Crankcase heater (E1HC) Compressor (INV 1) (M1C) C: 1P385180B 24 Refrigerant Circuit

37 Functional Parts Layout 2.3 REYQ144 / 168TYDN Plane View expansion (Refrigerant cooling) (Y5E) expansion (Subcooling heat exchanger) (Y2E) Four way (Heat exchanger upper) (Y6S) Four way (Heat exchanger lower) (Y5S) Solenoid (Liquid shutoff) (Y3S) Solenoid (DS oil return 2) (Y2S) Solenoid (DS oil return 1) (Y1S) High pressure sensor (S1NPH) Thermistor (Heat exchanger gas upper) (R8T) Thermistor (Suction) (R10T) Thermistor (M1C discharge) (R21T) Thermistor (M2C discharge) (R22T) Front View Fan motor (M2F) Thermistor (Outdoor air) (R1T) Fan motor (M1F) Four way (HP/LP gas) (Y4S) Thermistor (Heat exchanger gas lower) (R9T) High pressure switch (S1PH) Low pressure sensor (S1NPL) Thermistor (Compressor suction) (R12T) expansion (Heat exchanger upper) (Y1E) High pressure switch (S2PH) Thermistor (Deicer) (R11T) expansion (Heat exchanger lower) (Y3E) Thermistor (M2C body) (R14T) Crankcase heater (E2HC) Compressor (INV 2) (M2C) Thermistor (Receiver gas purge) (R13T) Crankcase heater (E1HC) Compressor (INV 1) (M1C) C: 1P385181C Refrigerant Circuit 25

38 Functional Parts Layout 2.4 REYQ72TTJU Plane View expansion (Refrigerant cooling) (Y5E) expansion (Subcooling heat exchanger) (Y2E) Four way (Heat exchanger lower) (Y5S) Four way (Heat exchanger upper) (Y6S) Thermistor (Heat exchanger gas lower) (R9T) Thermistor (Heat exchanger gas upper) (R8T) Four way (HP/LP gas) (Y4S) Solenoid (Liquid shutoff) (Y3S) Solenoid (DS oil return) (Y1S) Thermistor (Suction) (R10T) Thermistor (M1C discharge) (R2T) SiUS341504E Front View Fan motor (M1F) High pressure sensor (S1NPH) High pressure switch (S1PH) Thermistor (Compressor suction) (R12T) Thermistor (Receiver gas purge) (R13T) Low pressure sensor (S1NPL) Thermistor (Deicer) (R11T) Crankcase heater (E1HC) Thermistor (M1C body) (R14T) Compressor (INV) (M1C) C: 1P383624C 26 Refrigerant Circuit

39 Functional Parts Layout 2.5 REYQ96 / 120TTJU Plane View expansion (Refrigerant cooling) (Y5E) expansion (Subcooling heat exchanger) (Y2E) Four way (Heat exchanger lower) (Y5S) Thermistor (Heat exchanger gas upper) (R8T) Four way (Heat exchanger upper) (Y6S) Thermistor (Suction) (R10T) Thermistor (M2C discharge) (R22T) Solenoid (Liquid shutoff) (Y3S) Solenoid (DS oil return 2) (Y2S) Solenoid (DS oil return 1) (Y1S) High pressure sensor (S1NPH) Thermistor (M1C discharge) (R21T) Front View Fan motor (M1F) Thermistor (Outdoor air) (R1T) Fan motor (M2F) Thermistor (Heat exchanger gas lower) (R9T) High pressure switch (S2PH) Four way (HP/LP gas) (Y4S) High pressure switch (S1PH) Low pressure sensor (S1NPL) expansion (Heat exchanger upper) (Y1E) Thermistor (Compressor suction) (R12T) Thermistor (Receiver gas purge) (R13T) expansion (Heat exchanger lower) (Y3E) Thermistor (Deicer) (R11T) Crankcase heater (E1HC) Crankcase heater (E2HC) Compressor (INV 1) (M1C) Compressor (INV 2) (M2C) C: 1P383625D Refrigerant Circuit 27

40 Functional Parts Layout 2.6 REYQ144 / 168TTJU Plane View expansion (Refrigerant cooling) (Y5E) expansion (Subcooling heat exchanger) (Y2E) Four way (Heat exchanger upper) (Y6S) Four way (Heat exchanger lower) (Y5S) Thermistor (Heat exchanger gas upper) (R8T) Solenoid (Liquid shutoff) (Y3S) Solenoid (DS oil return 2) (Y2S) Solenoid (DS oil return 1) (Y1S) High pressure sensor (S1NPH) SiUS341504E Thermistor (Suction) (R10T) Thermistor (M1C discharge) (R21T) Thermistor (M2C discharge) (R22T) Front View Fan motor (M2F) Fan motor (M1F) Thermistor (Heat exchanger gas lower) (R9T) Four way (HP/LP gas) (Y4S) Low pressure sensor (S1NPL) High pressure switch (S1PH) expansion (Heat exchanger upper) (Y1E) Thermistor (Compressor suction) (R12T) High pressure switch (S2PH) expansion (Heat exchanger lower) (Y3E) Thermistor (Deicer) (R11T) Thermistor (Receiver gas purge) (R13T) Thermistor (M2C body) (R14T) Crankcase heater (E1HC) Crankcase heater (E2HC) Compressor (INV 2) (M2C) Compressor (INV 1) (M1C) C: 1P383626D 28 Refrigerant Circuit

41 Refrigerant Flow for Each Operation Mode 3. Refrigerant Flow for Each Operation Mode 3.1 REYQ72TYDN / REYQ72TTJU Cooling Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Cooling Unit Thermostat "OFF" Cooling Unit Thermostat "ON" Cooling Unit Indoor Unit Fan "OFF" "OFF" Fan "ON" "ON" Fan "ON" "ON" Indoor unit Operation Stop (With service port φ5/16in. (7.9mm) flare connection) Liquid pipe Check Check Check Check expansion expansion Solenoid SV expansion Double tube heat exchanger Capillary tube Check Liquid Receiver Fusible plug Pressure regulating Fan M Check Check expansion Capillary tube Four way expansion Four way expansion Heat sink Double tube heat exchanger S1NPH High pressure sensor Check Dual pressure gas pipe Suction gas pipe Low pressure sensor S1NPL Four way Capillary tube Charge port High pressure switch S1PH Solenoid Compressor INV SV Oil separator Capillary tube Accumulator Fusible plug Refrigerant Circuit 29

42 Refrigerant Flow for Each Operation Mode SiUS341504E Heating Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Heating Unit 192 pulse Thermostat "OFF" Heating Unit 192 pulse Thermostat "ON" Heating Unit Indoor Unit Fan "OFF" "OFF" Fan "LL" "ON" Fan "ON" "ON" Indoor unit Operation Stop (With service port φ5/16in. (7.9mm) flare connection) Liquid pipe Check Check Check Check expansion expansion Solenoid SV expansion Double tube heat exchanger Capillary tube Check Liquid Receiver Fusible plug Pressure regulating Fan M Check Check expansion Capillary tube Four way expansion Four way expansion Heat sink Double tube heat exchanger S1NPH High pressure sensor Check Dual pressure gas pipe Suction gas pipe Low pressure sensor S1NPL Four way Capillary tube Charge port High pressure switch S1PH Solenoid Compressor INV SV Oil separator Capillary tube Accumulator Fusible plug 30 Refrigerant Circuit

43 Refrigerant Flow for Each Operation Mode Simultaneous Cooling / Heating Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Thermostat "OFF" Heating Unit 192 pulse Thermostat "ON" Heating Unit Thermostat "ON" Cooling Unit Indoor Unit Fan "LL" "ON" Fan "ON" "ON" Fan "ON" "ON" Indoor unit Operation Stop (With service port φ5/16in. (7.9mm) flare connection) Liquid pipe Check Check Check Check expansion expansion Solenoid SV expansion Double tube heat exchanger Capillary tube Check Liquid Receiver Fusible plug Pressure regulating Fan M Check Check expansion Capillary tube Four way expansion Four way expansion Heat sink Double tube heat exchanger S1NPH High pressure sensor Check Dual pressure gas pipe Suction gas pipe Low pressure sensor S1NPL Four way Capillary tube Charge port High pressure switch S1PH Solenoid Compressor INV SV Oil separator Capillary tube Accumulator Fusible plug Refrigerant Circuit 31

44 Refrigerant Flow for Each Operation Mode SiUS341504E Cooling Oil Return Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Cooling Unit 192 pulse Thermostat "OFF" Cooling Unit Thermostat "ON" Cooling Unit Indoor Unit Fan "OFF" "OFF" Fan "ON" "ON" Fan "ON" "ON" Indoor unit Operation Stop (With service port φ5/16in. (7.9mm) flare connection) Liquid pipe Check Check Check Check expansion expansion Solenoid SV expansion Double tube heat exchanger Capillary tube Check Liquid Receiver Fusible plug Pressure regulating Fan M Check Check expansion Capillary tube Four way expansion Four way expansion Heat sink Double tube heat exchanger S1NPH High pressure sensor Check Dual pressure gas pipe Suction gas pipe Low pressure sensor S1NPL Four way Capillary tube Charge port High pressure switch S1PH Solenoid Compressor INV SV Oil separator Capillary tube Accumulator Fusible plug 32 Refrigerant Circuit

45 Refrigerant Flow for Each Operation Mode Defrost Heating Oil Return Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Heating Unit 224 pulse Indoor Unit Thermostat "OFF" Heating Unit Indoor Unit Thermostat "ON" Heating Unit Indoor Unit Fan "OFF" "OFF" Fan "LL" "ON" Fan "ON" "ON" Indoor unit Operation Stop (With service port φ5/16in. (7.9mm) flare connection) Liquid pipe Check Check Check Check expansion expansion Solenoid SV expansion Double tube heat exchanger Capillary tube Check Liquid Receiver Fusible plug Pressure regulating Fan M Check Check expansion Capillary tube Four way expansion Four way expansion Heat sink Double tube heat exchanger S1NPH High pressure sensor Check Dual pressure gas pipe Suction gas pipe Low pressure sensor S1NPL Four way Capillary tube Charge port High pressure switch S1PH Solenoid Compressor INV SV Oil separator Capillary tube Accumulator Fusible plug Refrigerant Circuit 33

46 Refrigerant Flow for Each Operation Mode SiUS341504E Oil Return Operation at Simultaneous Cooling / Heating Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Heating Unit 224 pulse Thermostat "ON" Heating Unit Thermostat "ON" Cooling Unit Indoor Unit Fan "ON" "ON" Fan "ON" "ON" Fan "ON" "ON" Indoor unit Operation Stop (With service port φ5/16in. (7.9mm) flare connection) Liquid pipe Check Check Check Check expansion expansion Solenoid SV expansion Double tube heat exchanger Capillary tube Check Liquid Receiver Fusible plug Pressure regulating Fan M Check Check expansion Capillary tube Four way expansion Four way expansion Heat sink Double tube heat exchanger S1NPH High pressure sensor Check Dual pressure gas pipe Suction gas pipe Low pressure sensor S1NPL Four way Capillary tube Charge port High pressure switch S1PH Solenoid Compressor INV SV Oil separator Capillary tube Accumulator Fusible plug 34 Refrigerant Circuit

47 Refrigerant Flow for Each Operation Mode 3.2 REYQ96-168TYDN / REYQ96-168TTJU Cooling Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Cooling Unit Thermostat "OFF" Cooling Unit Thermostat "ON" Cooling Unit Indoor Unit Fan "OFF" "OFF" Fan "ON" "ON" Fan "ON" "ON" Indoor unit Operation Stop (With service port φ5/16in. (7.9mm) flare connection) Liquid pipe Check Check Check Check expansion Double tube heat exchanger expansion Capillary tube Check Receiver Pressure regulating Fusible plug Solenoid SV Fan M Fan M Check expansion Check Capillary tube expansion Four way expansion Four way expansion Heat sink Dual pressure gas pipe Low pressure sensor S1NPL Four way Double tube heat exchanger Capillary tube Charge port High pressure switch S2PH S1NPH High pressure sensor Solenoid SV Check Oil Separator High pressure switch S1PH Solenoid SV Check Oil Separator Suction gas pipe Compressor INV 2 Capillary tube Compressor INV 1 Capillary tube Accumulator Fusible plug Refrigerant Circuit 35

48 Refrigerant Flow for Each Operation Mode SiUS341504E Heating Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Heating Unit 192 pulse Thermostat "OFF" Heating Unit 192 pulse Thermostat "ON" Heating Unit Indoor Unit Fan "OFF" "OFF" Fan "LL" "ON" Fan "ON" "ON" Indoor unit Operation Stop (With service port φ5/16in. (7.9mm) flare connection) Liquid pipe Check Check Check Check expansion Double tube heat exchanger expansion Capillary tube Check Receiver Pressure regulating Fusible plug Solenoid SV Fan M Fan M Check expansion Check Capillary tube expansion Four way expansion Four way expansion Heat sink Dual pressure gas pipe Low pressure sensor S1NPL Four way Double tube heat exchanger Capillary tube Charge port High pressure switch S2PH S1NPH High pressure sensor Solenoid SV Check Oil Separator High pressure switch S1PH Solenoid SV Check Oil Separator Suction gas pipe Compressor INV 2 Capillary tube Compressor INV 1 Capillary tube Accumulator Fusible plug 36 Refrigerant Circuit

49 Refrigerant Flow for Each Operation Mode Simultaneous Cooling / Heating Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Thermostat "OFF" Heating Unit 192 pulse Thermostat "ON" Heating Unit Thermostat "ON" Cooling Unit Indoor Unit Fan "LL" "ON" Fan "ON" "ON" Fan "ON" "ON" Indoor unit Operation Stop (With service port φ5/16in. (7.9mm) flare connection) Liquid pipe Check Check Check Check expansion Double tube heat exchanger expansion Capillary tube Check Receiver Pressure regulating Fusible plug Solenoid SV Fan M Fan M Check expansion Check Capillary tube expansion Four way expansion Four way expansion Heat sink Dual pressure gas pipe Low pressure sensor S1NPL Four way Double tube heat exchanger Capillary tube Charge port High pressure switch S2PH S1NPH High pressure sensor Solenoid SV Check Oil Separator High pressure switch S1PH Solenoid SV Check Oil Separator Suction gas pipe Compressor INV 2 Capillary tube Compressor INV 1 Capillary tube Accumulator Fusible plug Refrigerant Circuit 37

50 Refrigerant Flow for Each Operation Mode SiUS341504E Cooling Oil Return Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Cooling Unit 192 pulse Thermostat "OFF" Cooling Unit Thermostat "ON" Cooling Unit Indoor Unit Fan "OFF" "OFF" Fan "ON" "ON" Fan "ON" "ON" Indoor unit Operation Stop (With service port φ5/16in. (7.9mm) flare connection) Liquid pipe Check Check Check Check expansion Double tube heat exchanger expansion Capillary tube Check Receiver Pressure regulating Fusible plug Solenoid SV Fan M Fan M Check expansion Check Capillary tube expansion Four way expansion Four way expansion Heat sink Dual pressure gas pipe Low pressure sensor S1NPL Four way Double tube heat exchanger Capillary tube Charge port High pressure switch S2PH S1NPH High pressure sensor Solenoid SV Check Oil Separator High pressure switch S1PH Solenoid SV Check Oil Separator Suction gas pipe Compressor INV 2 Capillary tube Compressor INV 1 Capillary tube Accumulator Fusible plug 38 Refrigerant Circuit

51 Refrigerant Flow for Each Operation Mode Defrost Heating Oil Return Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Heating Unit 224 pulse Thermostat "OFF" Heating Unit Thermostat "ON" Heating Unit Indoor Unit Fan "OFF" "OFF" Fan "LL" "ON" Fan "ON" "ON" Indoor unit Operation Stop (With service port φ5/16in. (7.9mm) flare connection) Liquid pipe Check Check Check Check expansion Double tube heat exchanger expansion Capillary tube Check Receiver Pressure regulating Fusible plug Solenoid SV Fan M Fan M Check expansion Check Capillary tube expansion Four way expansion Four way expansion Heat sink Dual pressure gas pipe Low pressure sensor S1NPL Four way Double tube heat exchanger Capillary tube Charge port High pressure switch S2PH S1NPH High pressure sensor Solenoid SV Check Oil Separator High pressure switch S1PH Solenoid SV Check Oil Separator Suction gas pipe Compressor INV 2 Capillary tube Compressor INV 1 Capillary tube Accumulator Fusible plug Refrigerant Circuit 39

52 Refrigerant Flow for Each Operation Mode SiUS341504E Oil Return Operation at Simultaneous Cooling / Heating Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) (EVL) (EVH) (EVSC) Double pipe heat exchanger Double pipe heat exchanger Double pipe heat exchanger Heating Unit 224 pulse Thermostat "ON" Heating Unit Thermostat "ON" Cooling Unit Indoor Unit Fan "ON" "ON" Fan "ON" "ON" Fan "ON" "ON" Indoor unit Operation Stop (With service port φ5/16in. (7.9mm) flare connection) Liquid pipe Check Check Check Check expansion Double tube heat exchanger expansion Capillary tube Check Receiver Pressure regulating Fusible plug Solenoid SV Fan M Fan M Check expansion Check Capillary tube expansion Four way expansion Four way expansion Heat sink Dual pressure gas pipe Low pressure sensor S1NPL Four way Double tube heat exchanger Capillary tube Charge port High pressure switch S2PH S1NPH High pressure sensor Solenoid SV Check Oil Separator High pressure switch S1PH Solenoid SV Check Oil Separator Suction gas pipe Compressor INV 2 Capillary tube Compressor INV 1 Capillary tube Accumulator Fusible plug 40 Refrigerant Circuit

53 Part 3 Remote Controller 1. Wired Remote Controller Applicable Models Names and Functions MAIN/SUB Setting when Using 2 Remote Controllers Centralized Control Group No. Setting Wireless Remote Controller Applicable Models Names and Functions Address and MAIN/SUB Setting Service Mode BRC1E Remote Controller 41

54 Wired Remote Controller SiUS341504E 1. Wired Remote Controller 1.1 Applicable Models FXFQ-T FXFQ-P FXZQ-M FXDQ-M FXMQ-PB FXMQ-M FXHQ-M FXAQ-P FXUQ-P FXLQ-M FXNQ-M FXTQ-PA BRC1E73 (Navigation Remote Controller) 1.2 Names and Functions BRC1E73 1. Operation mode selector button 11. LCD (with backlight) 4. Up button 5. Down button 6. Right button 7. Left button 9. Operation lamp 8. On/Off button 3. Menu/OK button 10. Cancel button Functions other than basic operation items (i.e., On/Off, Operation Mode, Fan Speed, and Setpoint) are set from the menu screen. TE Do not install the remote controller in places exposed to direct sunlight, the LCD will be damaged. Do not pull or twist the remote controller cord, the remote controller may be damaged. Do not use objects with sharp ends to press the buttons on the remote controller damage may result. 1. Operation mode selector button Press this button to select the operation mode of your preference. Available modes vary with the indoor unit model. 2. Fan speed control button Press this button to select the fan speed of your preference. Available fan speeds vary with the indoor unit model. 2. Fan speed control button 42 Remote Controller

55 Wired Remote Controller 3. Menu/OK button Used to enter the main menu. Used to enter the selected item. 4. Up button Used to raise the setpoint. The item above the current selection will be highlighted. (The highlighted items will be scrolled continuously when the button is continuously pressed.) Used to change the selected item. 5. Down button Used to lower the setpoint. The item below the current selection will be highlighted. (The highlighted items will be scrolled continuously when the button is continuously pressed.) Used to change the selected item. 6. Right button Used to highlight the next items on the right-hand side. Each screen is scrolled in the right-hand direction. 7. Left button Used to highlight the next items on the left-hand side. Each screen is scrolled in the left-hand direction. 8. On/Off button Press this button and system will start. Press this button again to stop the system. 9. Operation lamp This lamp illuminates solid green during normal operation. This lamp blinks if an error occurs. 10.Cancel button Used to return to the previous screen. 11. LCD (with backlight) The backlight will be illuminated for approximately 30 seconds by pressing any button. If two remote controllers are used to control a single indoor unit, only the controller accessed first will have backlight functionality. Remote Controller 43

56 Wired Remote Controller SiUS341504E 1.3 MAIN/SUB Setting when Using 2 Remote Controllers Situation The MAIN/SUB setting is necessary when 1 indoor unit is controlled by 2 remote controllers. When you use 2 remote controllers (control panel and separate remote controller), set one to MAIN and the other to SUB. Setting The remote controllers are factory setting to MAIN, so you only have to change one remote controller from MAIN to SUB. To change a remote controller from MAIN to SUB, proceed as follows: BRC1E73 The designation of the main and sub remote controllers can be swapped. Note that this change requires turning the power OFF and then ON again. Basic screen is displayed. Press "Cancel" button once. Press and hold "Cancel" button for 4 seconds or more. Service settings menu is displayed. Select "Switch Main Sub Controller" and press "Menu/OK" button. Press "Cancel" button. Item 2 is displayed. Press "Menu/OK" button. Item 2 is displayed. Select "Main RC" or "Sub RC" using the " / (Up/Down)" buttons, and then press "Menu/OK" button. Service settings menu Item 2 Switch Main Sub Controller Main RC Sub RC 44 Remote Controller

57 Wired Remote Controller 1.4 Centralized Control Group No. Setting BRC1E73 In order to conduct the centralized remote control using the central remote controller and the unified ON/OFF controller, Group No. settings should be made by group using the operating remote controller. Make Group No. settings for centralized remote control using the operating remote controller. <When initializing Group Address> Basic screen is displayed. Press "Cancel" button once. Press and hold "Cancel" button for 4 seconds or more. Service settings menu is displayed. Select "Group Address" and then press "Menu/OK" button. Press "Cancel" button once. Press "Cancel" button once. Item 2 is displayed. Select "Group Address (Unit)" and then press "Menu/OK" button. Item 2 is displayed Item 2 is displayed. Select the desired Unit No. using the " / (Up/Down)" buttons, and then select Group Address using the " " buttons. Press "Menu/OK" button. Select the desired Group Address using the " / (Up/Down)" buttons, and then press "Menu/OK" button. Item 2 is displayed. Service settings menu Item 2 Description Group Address Group Address (Group) This menu is used to make group address setting for centralized control. Group Address (Unit) It is also used to make group address setting by indoor unit. Remote Controller 45

58 Wired Remote Controller SiUS341504E <Group Address (Group)> Note: For setting group No. of Energy recovery ventilator and wiring adaptor for other air conditioners, etc., refer to the instruction manual attached. Basic screen is displayed. Press "Cancel" button once. TICE Enter the group No. and installation place of the indoor unit into the attached installation table. Be sure to keep the installation table with the operation manual for maintenance. Press and hold "Cancel" button for 4 seconds or more. Service settings menu is displayed. Select "Group Address" and then press "Menu/OK" button. Press "Cancel" button once. Press "Cancel" button once. Item 2 is displayed. Select "Group Address (Group)" and then press "Menu/OK" button. Item 2 is displayed. Press "Menu/OK" button. Select the desired Group Address using the " / (Up/Down)" buttons, and then press "Menu/OK" button. Item 2 is displayed. 46 Remote Controller

59 Wireless Remote Controller 2. Wireless Remote Controller 2.1 Applicable Models FXFQ-T FXFQ-P FXZQ-M FXDQ-M FXMQ-PB FXMQ-M 2.2 Names and Functions FXHQ-M FXAQ-P FXUQ-P FXLQ-M FXNQ-M FXTQ-PA BRC7C812 BRC4C82 BRC7E83 BRC7E P J Remote Controller 47

60 Wireless Remote Controller SiUS341504E DISPLAY (SIGNAL TRANSMISSION) This lights up when a signal is being transmitted. DISPLAY (OPERATION MODE) This display shows the current OPERATION MODE. For cooling only type, (Auto) and (Heating) are not installed. DISPLAY (SET TEMPERATURE) This display shows the set temperature. DISPLAY (PROGRAMMED TIME) This display shows PROGRAMMED TIME of the system start or stop. DISPLAY (AIRFLOW FLAP) DISPLAY (FAN SPEED) The display shows the set fan speed. DISPLAY TEST (INSPECTION/ TEST OPERATION) When the INSPECTION/TEST OPERATION BUTTON is pressed, the display shows the system mode is in. ON/OFF BUTTON Press the button and the system will start. Press the button again and the system will stop. FAN SPEED CONTROL BUTTON Press this button to select the fan speed, HIGH or LOW, of your choice. TEMPERATURE SETTING BUTTON Use this button for SETTING TEMPERATURE (Operates with the front cover of the remote controller closed.) PROGRAMMING TIMER BUTTON Use this button for programming START and/or STOP time. (Operates with the front cover of the remote controller opened.) TIMER MODE START/STOP BUTTON TIMER RESERVE/CANCEL BUTTON AIRFLOW DIRECTION ADJUST BUTTON OPERATION MODE SELECTOR BUTTON Press this button to select OPERATION MODE. FILTER SIGN RESET BUTTON Refer to the section of MAINTENANCE in the operation manual attached to the indoor unit. INSPECTION/TEST OPERATION BUTTON This button is used only by qualified service persons for maintenance purposes. EMERGENCY OPERATION SWITCH This switch is readily used if the remote controller does not work. RECEIVER This receives the signals from the remote controller. OPERATING INDICATOR LAMP (Red) This lamp stays lit while the air conditioner runs. It blinks when the unit is in trouble. TIMER INDICATOR LAMP (Green) This lamp stays lit while the timer is set. AIR FILTER CLEANING TIME INDICATOR LAMP (Red) Lights up when it is time to clean the air filter. DEFROST LAMP (Orange) Lights up when the defrosting operation has started. (For cooling only type this lamp does not turn ON.) TES For the sake of explanation, all indications are shown on the display in Figure 1 contrary to actual running situations. Fig. 1-2 shows the remote controller with the front cover opened. If the air filter cleaning time indicator lamp lights up, clean the air filter as explained in the operation manual provided with the indoor unit. After cleaning and reinstalling the air filter, press the filter sign reset button on the remote controller. The air filter cleaning time indicator lamp on the receiver will go out. The Defrost Lamp will blink when the power is turned ON. This is not an error. C: 3P J 48 Remote Controller

61 1 2 3 SiUS341504E Wireless Remote Controller 2.3 Address and MAIN/SUB Setting Introduction To set the wireless remote controller, you have to set the address for: The receiver of the wireless remote controller The wireless remote controller. Setting the Address for the Receiver The address for the receiver of the wireless remote controller is factory setting to 1. To change this setting, proceed as follows: Set the wireless address switch (SS2) on the PCB according to the table below. Unit No. No. 1 No. 2 No. 3 Wireless address switch (SS2) When using both a wired and a wireless remote controller for 1 indoor unit, the wired controller should be set to MAIN. Therefore, set the MAIN/SUB switch (SS1) of the receiver to SUB. MAIN/SUB MAIN SUB MAIN/SUB switch (SS1) S M S M Setting the Address for the Wireless Remote Controller The address for the wireless remote controller is factory setting to 1. To change this setting, proceed as follows: 1. Hold down the button and the button for at least 4 seconds to get the Field setting mode. (Indicated in the display area in the figure at right.) Mode 3 2. Press the button and select a multiple setting (A/b). Each time the button is pressed the display switches between A and b. 3. Press the button or button to set the address Address can be set from 1 to 6, but set it to 1 ~ 3 and to same address as the receiver. (The receiver does not work with address 4 ~ 6.) 4. Press the button to enter the setting. Address Multiple setting Hold down the button for at least 1 second to quit the Field setting mode and return to the normal display. Remote Controller 49

62 Service Mode SiUS341504E 3. Service Mode 3.1 BRC1E73 Operating the remote controller allows service data to be acquired and various services to be set. Basic screen is displayed. Press "Cancel" button once. Press and hold "Cancel" button for 4 seconds or more. Press "Cancel" button. Service settings menu is displayed. Press and hold "Cancel" button for 4 seconds or more. Maintenance menu is displayed. Select the desired item from the Maintenance menu, and then press "Menu/OK" button. Press "Cancel" button. Item 2 is displayed. Select the desired Unit No. using the " / (Up/Down)" buttons. The corresponding data will be displayed. Maintenance Menu Item 2 Remarks 2.1 Model Name 1.Unit No. Select the Unit No. you want to check. 2.Indoor unit 3. Outdoor unit 2.2 Operation Hours 1.Unit No. Select the Unit No. you want to check. 2.Indoor unit operating All of these are displayed in hours. time 3.Indoor fan operation 4.Indoor unit energized time 5. Outdoor unit operating time 6. Outdoor unit fan 1 operation 7. Outdoor unit fan 2 operation 8. Outdoor comp. 1 operation 9. Outdoor comp. 2 operation 2.3 Indoor Unit Status 1. Unit No. Select the Unit No. you want to check. 2.FAN Fan tap 3.FLAP Swing, fixed 4.Speed Fan speed (rpm) 5. EV Degree that electronic expansion is open (pulse) 6. MP Drain pump ON/OFF 7.EH Electric heater ON/OFF 8. Hu Humidifier ON/OFF 9.TBF Anti-freezing control ON/OFF 50 Remote Controller

63 Service Mode Maintenance Menu Item 2 Remarks 2.3 Indoor Unit Status 10.FLOAT 11.T1/T2 12.Unit No. Select the Unit No. you want to check. SkyAir VRV 13.Th1 Suction air thermistor Suction air thermistor 14.Th2 Heat exchanger thermistor Heat exchanger liquid pipe thermistor 15.Th3 Heat exchanger gas pipe thermistor 16.Th4 Discharge air thermistor Discharge air thermistor 17.Th5 18.Th6 2.4 Outdoor Unit Status 1.Unit No. Select the Unit No. you want to check. 2.FAN step Fan tap 3. COMP Compressor power supply frequency (Hz) 4. EV1 Degree that electronic expansion is open (pulse) 5.SV1 Solenoid ON/OFF SkyAir VRV 6. Th1 Outdoor air thermistor 7. Th2 Heat exchanger thermistor 8.Th3 Discharge pipe thermistor 9.Th4 Heat exchanger deicer thermistor 10.Th5 Heat exchanger gas pipe thermistor 11.Th6 Liquid pipe thermistor 2.5 Forced Defrost 1.Forced defrost ON Enables the forced defrost operation. (SkyAir only) 2.Forced defrost OFF Disables the forced defrost operation. 2.6 Error Display 1.Display Error ON Displays the error on the screen. 2.Display Error OFF Displays neither errors nor warnings. 3.Display Warning ON Displays a warning on the screen if an error occurs. 4.Display Warning OFF No warning is displayed. 2.7 Swap Unit No. 1.Current Unit No. A unit No. can be transferred to another. 2. Transfer Unit No. 2.8 Addressed Sensor Value Unit No.: 0-15 Code 00: 01: 02: 03: 04: 05: 06: 07: 08: 09: Data Select the Unit No. you want to check. Remote controller thermistor ( F) Suction air thermistor ( F) Heat exchanger liquid pipe thermistor ( F) Heat exchanger gas pipe thermistor ( F) Indoor unit address No. Outdoor unit address No. Branch selector unit address No. Zone control address No. Cooling/Heating batch address No. Demand/low-noise address No. The corresponding data will be displayed, based on the Unit No. and Code selected. Remote Controller 51

64 Part 4 Function and Control 1. Function General Operation Mode Stop Control Standby Control Startup Control Basic Control List of Functions in Normal Operation Compressor PI Control Operating Priority and Rotation of Compressors Compressor Step Control PI Control Step Control of Outdoor Unit Fans Heat Exchanger Control Protection Control High Pressure Protection Control Low Pressure Protection Control Discharge Pipe Protection Control Inverter Protection Control Special Control Pump down Residual Operation Oil Return Operation Defrost Operation Cooling / Heating Mode Switching Other Control Backup Operation Demand Operation Heating Operation Prohibition Outline of Control (Indoor Unit) Operation Flow Chart Thermostat Control Drain Pump Control Control of Freeze-up Prevention Heater Control (Optional PCB KRP1B... is required.) List of Swing Flap Operations Hot Start Control (In Heating Only) Louver Control for Preventing Ceiling Dirt Heater Control (FXTQ) Step Thermostat Processing (FXTQ) Interlocked with External Equipment (FXTQ) Function and Control

65 Function General 1. Function General 1.1 Operation Mode Operation flow chart For detailed description of each function in the flow below, refer to the details on related function on the following pages. 1.1 Stop control (1) Stop due to error (2) When system is in stop mode (3) Slave unit stops during master unit operation 1.2 Standby control (1) Restart standby (2) Crankcase heater control Thermo. ON 1.3 Startup control (include pressure equalization before startup) (1) Startup control in cooling (2) Startup control in heating Thermo. ON 1.6 Special control (1) Pump down residual operation (note 2) (2) Outdoor unit rotation Thermo. OFF End of startup control Abnormality Thermo. OFF 1.4 Basic control (1) List of Functions in Normal Operation (2) Compressor PI control (3) Operation priority and rotation of compressors (4) Compressor step control (5) expansion PI control (6) Step control of outdoor unit fans (7) Heat exchanger control 1.5 Protection control (1) High pressure protection control (2) Low pressure protection control (3) Discharge pipe protection control (4) Compressor body protection control (5) Inverter protection control Conditions met for oil return Conditions met for defrosting (3) Oil return operation (note 1) (4) Defrost operation (note1) Note: 1. In the event indoor unit stops or the thermostat turns OFF while in oil return operation or defrosting operation, pump down residual operation is performed on completion of the oil return operation or defrosting operation. 2. Not performed during cooling mode. Function and Control 53

66 Function General SiUS341504E 1.2 Stop Control Stop due to Error In order to protect compressors, if any of the abnormal state occurs, the system will make "stop with thermostat OFF" and the error will be determined according to the number of retry times. (Refer to "Error code and Description" (P.152~) of the troubleshooting for the items to determine the error.) When System is in Stop Mode The four way s both for heat exchanger switch and piping switch retain the condition before they were stopped Slave Unit Stops during Master Unit Operation When slave unit is stopped (because of low demand), conditions for this unit are set same as above When System is in Stop Mode till this unit is required to operate (increase of load). 1.3 Standby Control Restart Standby Used to forcedly stop the compressor for a period of 5 minutes, in order to prevent the frequent ON/OFF of the compressor and equalize the pressure within the refrigerant system. In addition, the outdoor unit fan carry out the residual operation for a while to suppress the acceleration of the pressure equalizing and melting of the refrigerant to the evaporator Crankcase Heater Control In order to prevent the refrigerant from melting in the compressor oil in the stopped mode, this mode is used to control the crankcase heater. Crankcase heater OFF Discharge pipe temperature < 70 C (158 F) Discharge pipe temperature > 75 C (167 F) Crankcase heater ON 54 Function and Control

67 Function General 1.4 Startup Control This control is used to equalize the pressure in the front and back of the compressor prior to the startup of the compressor, thus reducing startup loads. Furthermore, the inverter is turned ON to charge the capacitor. To avoid stresses to the compressor due to oil return or else after the startup, the following control is made and the position of the four way is also determined. Start both the master and the slave units simultaneously to position the four way Startup Control in Cooling INV compressor 1 (M1C) 0 Hz Frequency step up 5 sec. interval A C B D E A B C D E REYQ72T 60 Hz 75 Hz 90 Hz 120 Hz 180 Hz REYQ96-168T 52 Hz 74 Hz 90 Hz 120 Hz 164 Hz INV compressor 2 (M2C) 0 Hz only REYQ96-168T 3,000 pulse (fully open) expansion (main) (Y1E) 0 pulse Inverter fan Step4 M1F: REYQ72T M1F + M2F: REYQ96-168T Ta < 20 C: OFF (68 F) Ta 20 C: Step4 (68 F) +1step/15 sec. (Pc > 2.16 MPa (723 fth2o)) 1step/15 sec. (Pc < 1.77 MPa (592 fth2o)) Pc Pe > 0.17 MPa (57 fth2o) OR & Pc Pe > 0.78 MPa (261 fth2o) Pc Pe > 0.39 MPa (130 fth2o) 164 Hz or more Function and Control 55

68 Function General SiUS341504E Startup Control in Heating INV compressor 1 (M1C) INV compressor 2 (M2C) only REYQ96-168T 0 Hz 0 Hz Frequency step up 5 sec. interval E D A B C Initial opening +12 Hz/20 sec. A +12 Hz/20 sec. A T(Ta Te)control A B C D E REYQ72T 60 Hz 75 Hz 90 Hz 120 Hz 180 Hz REYQ96-168T 52 Hz 74 Hz 90 Hz 120 Hz 164 Hz expansion 0 pulse (main) (Y1E) Step8 Inverter fan Step4 M1F: REYQ72T M1F + M2F: REYQ96-168T Pc Pe > 0.17 MPa (57 fth2o) OR Pc Pe > 0.78 MPa (261 fth2o) & Pc Pe > 0.39 MPa (130 fth2o) 164 Hz or more 56 Function and Control

69 Basic Control 2. Basic Control 2.1 List of Functions in Normal Operation Part Name REYQ72T Electric Symbol REYQ T Inverter compressor M1C M1C, M2C Function of Functional Part Normal Normal Cooling Normal Heating Simultaneous Cooling / Heating PI control, High pressure protection, Low pressure protection, Td protection, Inverter protection, Inverter fan M1F M1F, M2F Cooling fan control expansion (Heat exchanger upper) expansion (Heat exchanger lower) expansion (Subcooling heat exchanger) expansion (Receiver gas purge) expansion (Inverter cooling) Solenoid (Oil separator oil return) Y1E Y3E Y2E Y1E Y3E Y2E Subcooled degree control Subcooled degree control (0 pulse in low load) Superheated degree control (discharge pipe protection) PI control, High pressure protection, Low pressure protection, Td protection, Inverter protection, Outdoor unit heat exchanger: Condenser / Cooling fan control Outdoor unit heat exchanger: Evaporator / Fan step 7 or 8 Superheated degree control (Subcooled degree control in low load) Superheated degree control (0 pulse in low load) Superheated degree control (discharge pipe protection) PI control, High pressure protection, Low pressure protection, Td protection, Inverter protection, Outdoor unit heat exchanger: Condenser / Cooling fan control Outdoor unit heat exchanger: Evaporator / Fan step 7 or 8 Subcooled degree control (when HE is evaporator) Superheated degree control (when HE is condensor) Superheated degree control (discharge pipe protection) Y4E Y4E 0 pulse Gas purge control Gas purge control Y5E Y5E Cooling refrigerant control Cooling refrigerant control Y1S Y1S, Y2S ON ON ON Solenoid (Liquid pipe) Y3S Y3S ON ON ON Four way (HP/LP gas pipe) Y4S Y4S ON OFF OFF Four way (Heat exchanger lower) Four way (Heat exchanger upper) Y5S Y5S OFF (ON in low load) ON Y6S Y6S OFF ON (OFF in low load) Cooling refrigerant control OFF (in cooling) OFF (In heating) OFF (in cooling) OFF (In heating) expansion (EVSC) expansion (EVH) expansion (EVL) Branch selector unit actuator Y1E Y2E Y3E Normal cooling Normal Simultaneous Cooling / Heating Normal heating Cooling Cooling Heating Heating Thermo. ON 0 pulse 0 pulse Subcooled degree control 0 pulse Stopping 0 pulse 0 pulse 0 pulse 0 pulse Thermo. OFF 0 pulse 0 pulse 0 pulse 0 pulse Thermo. ON 6,000 pulse 0 pulse 6,000 pulse 6,000 pulse Stopping 6,000 pulse 0 pulse 6,000 pulse 6,000 pulse Thermo. OFF 6,000 pulse 0 pulse 6,000 pulse 6,000 pulse Thermo. ON 6,000 pulse 6,000 pulse 0 pulse 0 pulse Stopping 6,000 pulse 6,000 pulse 0 pulse 0 pulse Thermo. OFF 6,000 pulse 6,000 pulse 0 pulse 0 pulse Function and Control 57

70 Basic Control SiUS341504E 2.2 Compressor PI Control Carries out the compressor capacity PI control to maintain Te at constant during cooling operation and Tc at constant during heating operation to ensure stable unit performance. On multi-outdoor-unit systems, this control is made according to values of the first-priority unit, which is detected with the pressure sensor. [Cooling operation] Controls compressor capacity to adjust Te to achieve target value (TeS). Te set value (Make this setting while in Setting mode 2.) Te: Low pressure equivalent saturation temperature TeS: Target temperature of Te (Varies depending on Te setting, operating frequency, etc.) Te setting L M (Normal) (factory setting) 3 C (37.4 F) 6 C (42.8 F) 7 C (44.6 F) 8 C (46.4 F) H 9 C (48.2 F) 10 C (50 F) 11 C (51.8 F) [Heating operation] Controls compressor capacity to adjust Tc to achieve target value (TcS). Te set value (Make this setting while in Setting mode 2.) Tc setting L M (Normal) : factory setting H 43 C (109.4 F) 46 C (114.8 F) 48 C (118.4 F) Tc: High pressure equivalent saturation temperature TcS: Target temperature of Tc (Varies depending on Tc setting, operating frequency, etc.) 2.3 Operating Priority and Rotation of Compressors Each compressor operates in the following order of priority. In the case of multi-outdoor-unit system, each compressor operates in any of Pattern 1 through Pattern 3 according to the rotation of outdoor units. INV: Inverter compressor INV 1: Inverter compressor 1 INV 2: Inverter compressor 2 Pattern 1 Pattern 2 Pattern 3 [Single Outdoor Unit] Standard type: REYQ72T Standard type: REYQ96-168T No. 1 No. 1 No. 2 INV INV1 INV2 58 Function and Control

71 Basic Control [2 Outdoor Units] Standard type: REYQ192T Standard type: REYQ T No. 1 No. 2 No. 3 No. 2 No. 1 No. 3 INV INV1 INV2 No. 1 No. 3 No. 2 No. 4 No. 2 No. 4 No. 1 No. 3 INV1 INV2 INV1 INV2 [3 Outdoor Units] Standard type: REYQ T No. 1 No. 4 No. 3 No. 6 No. 2 No. 5 No. 2 No. 5 No. 1 No. 4 No. 3 No. 6 No. 3 No. 6 No. 2 No. 5 No. 1 No. 4 INV1 INV2 INV1 INV2 INV1 INV2 Note: 1. In the case of combination of 3 outdoor units, the above diagram shows master unit, slave unit 1, and slave unit 2 from left to right. 2. Compressors may operate in any pattern other than those mentioned above according to the operating status. Function and Control 59

72 Basic Control SiUS341504E 2.4 Compressor Step Control Compressor operations vary with the following steps according to information in "2.2 Compressor PI Control". Furthermore, the operating priority of compressors is subject to information in " Operating Priority and Rotation of Compressors". Single unit installation REYQ72T Step No. INV (Hz) Step No. INV (Hz) Step No. INV (Hz) REYQ72T upper limit Note: 1. Depending on the operating conditions of compressors, the compressors may run in patterns other than those aforementioned. 60 Function and Control

73 Basic Control REYQ96/120T Step Step up (Hz) Step down (Hz) Step Step up (Hz) Step down (Hz) Step Step up (Hz) Step down (Hz) No. INV1 INV2 INV1 INV2 No. INV1 INV2 INV1 INV2 No. INV1 INV2 INV1 INV REYQ96T upper limit REYQ120T upper limit Note: 1. Depending on the operating conditions of compressors, the compressors may run in patterns other than those aforementioned. Function and Control 61

74 Basic Control SiUS341504E REYQ144T Step Step up (Hz) Step down (Hz) Step Step up (Hz) Step down (Hz) Step Step up (Hz) Step down (Hz) No. INV1 INV2 INV1 INV2 No. INV1 INV2 INV1 INV2 No. INV1 INV2 INV1 INV REYQ144T upper limit Note: 1. Depending on the operating conditions of compressors, the compressors may run in patterns other than those aforementioned. 62 Function and Control

75 Basic Control 2.5 PI Control Main electronic expansion EVM control When the outdoor unit heat exchanging is performed via the evaporator (20SA is set to ON), this function is used to exert PI control on the electronic expansion (Y1E or Y3E) so that the evaporator outlet superheated degree (SH) will become constant. SH = Tg Te SH: Evaporator outlet superheated degree Tg: Suction pipe temperature detected by the heat exchanger gas pipe thermistor R2T Te: Low pressure equivalent saturated temperature Subcooling electronic expansion EVT control In order to make the maximum use of the subcooling heat exchanger, this function is used to exert PI control on the electronic expansion (Y2E, Y5E or Y3E) so that the evaporator-side gas pipe superheated degree (SH) will become constant. SH = Tsh Te SH: Evaporator outlet superheated degree Tsh: Suction pipe temperature detected by the subcooling heat exchanger outlet thermistor R5T Te: Low pressure equivalent saturated temperature Refrigerant charge electronic expansion EVJ control While in automatic refrigerant charge mode, this function is used to exert PI control on the opening degree of the electronic expansion (Y2E or Y4E) in response to outdoor temperature and close the after the completion of refrigerant charge. For normal operation, fully open this electronic expansion. Function and Control 63

76 Basic Control SiUS341504E 2.6 Step Control of Outdoor Unit Fans Used to control the revolutions of outdoor unit fans in the steps listed in table below, according to condition changes. REYQ72T Standard (default) Step No. Cooling Heating Simultaneous ( 1) ( 2) Step 2/X 2. Step X REYQ96T Step No. Standard (default) Cooling Heating Simultaneous FAN1 FAN2 FAN1 FAN ( 1) ( 2) Function and Control

77 Basic Control REYQ120T Step No. 1. Step 2/X 2. Step X Standard (default) Cooling Heating Simultaneous FAN1 FAN2 FAN1 FAN ( 1) ( 2) REYQ144T Step No. Standard (default) Cooling Heating Simultaneous FAN1 FAN2 FAN1 FAN ( 1) ( 2) Function and Control 65

78 Basic Control SiUS341504E 2.7 Heat Exchanger Control While in heating or cool/heat simultaneous operation, ensure target condensing and evaporating temperature by changing over the air heat exchange of outdoor unit to the evaporator or the condenser in response to loads. [Single system] Outdoor unit Lower side Upper side Condenser Condenser CL decrease HL increase CL increase HL decrease Outdoor unit Lower side Upper side Condenser CL decrease HL increase CL increase HL increase CL decrease HL increase Outdoor unit Lower side Upper side Evaporator Condenser CL increase HL decrease Outdoor unit Lower side Upper side Evaporator Evaporator [Multi outdoor unit system] Outdoor unit Lower side Upper side Lower side Upper side Lower side Upper side Condenser Condenser Condenser Condenser Condenser Outdoor unit Lower side Upper side Lower side Upper side Lower side Upper side Evaporator Condenser CL decrease HL increase CL increase HL decrease CL decrease HL increase CL increase HL decrease Outdoor unit Lower side Upper side Lower side Upper side Lower side Upper side Condenser Condenser Condenser Condenser CL decrease HL increase CL increase HL decrease Outdoor unit Lower side Upper side Lower side Upper side Lower side Upper side Condenser Condenser Condenser CL decrease HL increase CL increase HL decrease Outdoor unit Lower side Upper side Lower side Upper side Lower side Upper side Evaporator Evaporator CL decrease HL increase CL increase HL decrease Outdoor unit Lower side Upper side Lower side Upper side Lower side Upper side Evaporator Evaporator Evaporator Evaporator CL decrease HL increase CL increase HL decrease CL decrease HL increase CL increase HL decrease Outdoor unit Lower side Upper side Lower side Upper side Lower side Upper side Condenser Condenser Outdoor unit Lower side Upper side Lower side Upper side Lower side Upper side Evaporator Evaporator Evaporator Evaporator Evaporator Evaporator <Symbol meanings> CL: Cooling Load HL: Heating Load 66 Function and Control

79 Protection Control 3. Protection Control 3.1 High Pressure Protection Control This high pressure protection control is used to prevent the activation of protection devices due to abnormal increase of high pressure and to protect compressors against the transient increase of high pressure. [In cooling] Normal Operation Upper limit compressor step = max (Max. Step) Pc > 3.57 MPa (1194 fth2o) Pc: High pressure sensor detection value for each outdoor unit 21-step down 2-step down After 10 seconds After 15 seconds 9-step up Pc > 3.67 MPa (1228 fth2o) 9-step down Pc > 3.62 MPa (1211 fth2o) Pc > 3.57 MPa (1194 fth2o) 2-step down Pc < 3.14 MPa (1050 fth2o) Current Pc < 3.33 MPa (1114 fth2o) step 3-step up maintained After 15 seconds Pc < 3.45 MPa (1154 fth2o) After 10 seconds After 15 seconds 1-step up After 10 seconds Pc > 3.70 MPa (1238 fth2o) After 10 seconds Compressor step: 1 Pc > 3.72 MPa (1245 fth2o) High pressure standby (2 times within 30 minutes) Abnormal stop (E3 is displayed) High pressure switch (4.0 MPa (1338 fth2o)) is activated Function and Control 67

80 Protection Control SiUS341504E [In heating] Normal Operation Pc > 3.31 MPa (1107 fth2o) System 9-step down/10 seconds Pc > 3.31 MPa (1107 fth2o) Pc < 3.17 MPa (1061 fth2o) Pc < 3.22 MPa (1077 fth2o) System 3-step up/15 seconds Pc > 3.39 MPa (1134 fth2o) Pc < 3.17 MPa (1061 fth2o) All units Compressor step: 1 Pc: High pressure sensor detection value for master unit Pc > 3.72 MPa (1245 fth2o) High pressure standby (2 times within 30 minutes) Abnormal stop (E3 is displayed) High pressure switch (4.0 MPa (1338 fth2o)) is activated 68 Function and Control

81 Protection Control 3.2 Low Pressure Protection Control This low pressure protection control is used to protect compressors against the transient decrease of low pressure. [In cooling] Normal Operation Pe < 0.25 MPa (83.6 fth2o) All compressors step.: 1 Pe > 0.39 MPa (130.5 fth2o) Pe: Low pressure sensor detection value for master unit Pe < 0.15 MPa (50.2 fth2o) Master unit: Compressor step: 1 Slave unit: All stop Low pressure standby (3 times within 60 minutes) Pe < 0.07 MPa (23.4 fth2o) Abnormal stop (E4 is displayed) Low pressure standby (4 times within 60 minutes) [In heating] Pe < 0.17 MPa (56.9 fth2o) Normal Operation Upper limit compressor step = max (Max. Step) Pe: Low pressure sensor detection value for each outdoor unit 9-step down After 10 seconds After 15 seconds 9-step up Pe < 0.17 MPa (56.9 fth2o) Pe < 0.14 MPa (46.8 fth2o) Current step maintained Pe > 0.27 MPa (90.3 fth2o) Pe > 0.20 MPa (66.9 fth2o) 21-step down After 10 seconds After 15 seconds 3-step up Pe < 0.13 MPa (43.5 fth2o) After 10 seconds Compressor step: 1 Pe < 0.07 MPa (23.4 fth2o) Low pressure standby (3 times within 60 minutes) Abnormal stop (E4 is displayed) Low pressure standby (4 times within 60 minutes) Function and Control 69

82 Protection Control SiUS341504E 3.3 Discharge Pipe Protection Control This discharge pipe protection control is used to protect the compressor internal temperature against an error or transient increase of discharge pipe temperature. [INV compressor] HTdi > 115 C (239 F) Normal Operation Upper limit compressor step = max (Max. Step) HTdi: Value of INV compressor discharge pipe temperature (Tdi) compensated with outdoor air temperature 3-step down After 30 seconds After 20 seconds 9-step up HTdi > 115 C (239 F) After 30 seconds 9-step down HTdi > 118 C HTdi > 120 C (244.4 F) (248 F) 21-step down After 30 seconds Current step maintained After 20 seconds HTdi < 100 C (212 F) HTdi < 110 C (230 F) 3-step up HTdi > 130 C (266 F) After 20 seconds Compressor step: 1 OR HTdi > 135 C (275 F) HTdi > 120 C (248 F) continues for 10 minutes Discharge pipe temperature standby (2 times within 100 minutes) Abnormal stop (F3 is displayed) Discharge pipe temperature standby (3 times within 100 minutes) 70 Function and Control

83 Protection Control 3.4 Inverter Protection Control Inverter current protection control and radiation fin temperature control are performed to prevent tripping due to an error, or transient inverter overcurrent, and fin temperature increase. In the case of multi-outdoor-unit system, each INV compressor performs these controls in the following sequence. [Inverter overcurrent protection control] Perform the following control of integrated as well as multi units for each INV compressor. Normal operation A B Reduce compressor capacity C Inverter current standby When occurring 3 times within 60 minutes, the error code L8 is output. Model REYQ72T REYQ96-144T REYQ168T M1C M1C M2C M1C M2C A > 18.5 A > 14.7 A > 14.7 A > 14.7 A > 22.0 A B < 18.5 A < 14.7 A < 14.7 A < 14.7 A < 22.0 A C > 22.5 A > 16.1 A > 16.1 A > 16.1 A > 22.5 A [Radiation fin temperature control] Perform the following control of integrated as well as multi units for each INV compressor. Normal operation A B Reduce compressor capacity C Fin temperature standby When occurring 4 times within 60 minutes, the error code L4 is output. Model REYQ72T REYQ96-144T REYQ168T M1C M1C M2C M1C M2C A > 96 C (204.8 F) > 99 C (210.2 F) > 99 C (210.2 F) > 99 C (210.2 F) > 80 C (176 F) B < 93 C (199.4 F) < 96 C (204.8 F) < 96 C (204.8 F) < 96 C (204.8 F) < 77 C (170.6 F) C > 100 C (212 F) > 105 C (221 F) > 105 C (221 F) > 105 C (221 F) > 84 C (183.2 F) Function and Control 71

84 Special Control SiUS341504E 4. Special Control 4.1 Pump down Residual Operation If the liquid refrigerant stays in the evaporator at the startup of a compressor, this liquid refrigerant enters the compressor, thus resulting in diluted oil in the compressor and then degraded lubrication performance. Consequently, in order to recover the refrigerant in the evaporator while the compressor stops, the pump down residual operation is conducted. Part Name Electric Symbol Function of Functional Part REYQ72T REYQ96-168T Normal Cooling Normal Heating Inverter compressor 1 M1C M1C 124 Hz/120 Hz 124 Hz/120 Hz Inverter compressor 2 M2C 0 Hz 0 Hz Inverter fan M1F M1F, M2F For heat exchanger mode For heat exchanger mode expansion (Heat exchanger upper) Y1E Y1E expansion (Heat exchanger lower) Y3E Y3E Same as normal operation Same as normal operation expansion (Subcooling heat exchanger) Y2E Y2E 0 pulse 0 pulse expansion (Receiver gas purge) Y4E Y4E Open slightly Open slightly expansion (Inverter cooling) Y5E Y5E Same as normal operation Same as normal operation Solenoid (Oil separator oil return) Y1S Y1S, Y2S ON ON Solenoid (Liquid pipe) Y3S Y3S ON ON Four way (HP/LP gas pipe) Y4S Y4S Hold Hold Four way (Heat exchanger lower) Y5S Y5S Hold Hold Four way (Heat exchanger upper) Y6S Y6S Hold Hold Ending condition OR A lapse of 30 seconds A lapse of 30 seconds Pe_min < 0.25 Mpa (83.6 fth2o) Pe_min < 0.49 Mpa (163.9 fth2o) Master unit DSH > 35 C (95 F) OR Master unit DSH > 35 C (95 F) Pc_max > 3.14 MPa (1050 fth2o) Pc_max > 2.94 MPa (984 fth2o) Master unit Ta Te > 5 C (9 F) REYQ72T 72 Function and Control

85 Special Control 4.2 Oil Return Operation In order to prevent the compressor from running out of oil, the oil return operation is conducted to recover oil flown out from the compressor to the system side Oil Return Operation in Cooling Operation [Starting conditions] Referring to the set conditions for the following items, start the oil return operation in cooling Cumulative oil feed rate Timer setting (Make this setting so as to start the oil return operation when the initial cumulative operating time reaches 2 hours after power supply is turned ON and then every 8 hours.) Furthermore, the cumulative oil feed rate is computed from Tc, Te, and compressor loads. Part Name Electric Symbol REYQ72T REYQ96-168T Oil return operation Inverter compressor 1 M1C M1C Inverter compressor 2 M2C Constant low pressure control Inverter fan M1F M1F, M2F For heat exchanger mode expansion (Heat Y1E Y1E exchanger upper) Same as normal Same as normal expansion (Heat operation operation Y3E Y3E exchanger lower) expansion (Subcooling heat exchanger) Y2E Y2E 0 pulse expansion (Receiver gas purge) Y4E Y4E 0 pulse expansion (Inverter cooling) Y5E Y5E Same as normal operation Solenoid (Oil separator oil return) Y1S Y1S, Y2S ON Solenoid (Liquid pipe) Y3S Y3S ON Four way (HP/LP gas pipe) Y4S Y4S Hold Four way (Heat exchanger lower) Y5S Y5S Hold Four way (Heat exchanger upper) Y6S Y6S Hold A lapse of 3 minutes TsA Te < 3 C (5.4 F) Ending condition & A lapse of 6 minutes while the OR frequency is more than that of oil return operation. Fan expansion Indoor unit actuator Thermostat ON unit Stopping unit Thermostat OFF unit Thermostat ON unit Stopping unit Thermostat OFF unit Oil return operation Remote controller setting OFF Remote controller setting Normal control 224 pulse Forced thermo. OFF (PI control) Branch selector unit actuator Normal cooling Normal Simultaneous Cooling / Heating Normal heating Cooling Cooling Heating Heating Thermo. ON 0 pulse 0 pulse Subcooled degree control 0 pulse expansion Y1E Stopping 0 pulse 0 pulse 0 pulse 0 pulse (EVSC) Thermo. OFF 0 pulse 0 pulse 0 pulse 0 pulse Thermo. ON 6,000 pulse 0 pulse 6,000 pulse 6,000 pulse expansion Y2E Stopping 6,000 pulse 0 pulse 6,000 pulse 6,000 pulse (EVH) Thermo. OFF 6,000 pulse 0 pulse 6,000 pulse 6,000 pulse expansion (EVL) Y3E Thermo. ON 6,000 pulse 6,000 pulse 0 pulse 0 pulse Stopping 6,000 pulse 6,000 pulse 0 pulse 0 pulse Thermo. OFF 6,000 pulse 6,000 pulse 0 pulse 0 pulse Function and Control 73

86 Special Control SiUS341504E Oil Return Operation in Heating Operation [Starting conditions] Part Name Electric Symbol REYQ72T REYQ96-168T Oil return operation Inverter compressor 1 M1C M1C +1 to +6 steps from frequency to frequency when oil Inverter compressor 2 M2C return is IN at a constant level Inverter fan M1F M1F, M2F Same as normal operation expansion (Heat exchanger upper) Y1E Y1E expansion (Heat exchanger lower) Y3E Y3E Same as normal operation expansion (Subcooling heat exchanger) Y2E Y2E Same as normal operation expansion (Receiver gas purge) Y4E Y4E 0 pulse expansion (Inverter cooling) Y5E Y5E Same as normal operation Solenoid (Oil separator oil return) Y1S Y1S, Y2S ON Solenoid (Liquid pipe) Y3S Y3S ON Four way (HP/LP gas pipe) Y4S Y4S Hold Four way (Heat exchanger lower) Y5S Y5S Hold Four way (Heat exchanger upper) Y6S Y6S Hold Ending condition A lapse of 8 minutes while the frequency is more than that of oil return operation. Indoor unit actuator Cooling Heating Thermostat ON unit Remote controller setting Remote controller setting Fan Stopping unit OFF OFF Thermostat OFF unit Remote controller setting Remote controller setting Thermostat ON unit Normal control Normal control expansion Stopping unit 224 pulse 224 pulse Thermostat OFF unit Forced thermo. OFF 224 pulse Branch selector unit actuator expansion (EVSC) expansion (EVH) expansion (EVL) Y1E Y2E Y3E Normal cooling Normal Simultaneous Cooling / Heating Normal heating Cooling Cooling Heating Heating Thermo. ON 0 pulse 0 pulse Subcooled degree control 0 pulse Stopping 0 pulse 0 pulse 0 pulse 0 pulse Thermo. OFF 0 pulse 0 pulse 0 pulse 0 pulse Thermo. ON 6,000 pulse 0 pulse 6,000 pulse 6,000 pulse Stopping 6,000 pulse 0 pulse 6,000 pulse 6,000 pulse Thermo. OFF 6,000 pulse 0 pulse 6,000 pulse 6,000 pulse Thermo. ON 6,000 pulse 6,000 pulse 0 pulse 0 pulse Stopping 6,000 pulse 6,000 pulse 0 pulse 0 pulse Thermo. OFF 6,000 pulse 6,000 pulse 0 pulse 0 pulse 74 Function and Control

87 Special Control 4.3 Defrost Operation To defrost the outdoor unit heat exchanger while in Evaporator, the defrost operation is conducted to recover the heating capacity. Part Name Electric Symbol REYQ72T REYQ96-168T Defrost operation Inverter compressor 1 M1C M1C REYQ72: Hz REYQ96/120: Hz REYQ144/168: Hz Inverter compressor 2 M2C Inverter fan M1F M1F, M2F With high pressure OFF Step 2/X Step X expansion (Heat exchanger upper) Y1E Y1E expansion (Heat exchanger lower) Y3E Y3E 100% expansion (Subcooling heat exchanger) Y2E Y2E 0 pulse expansion (Receiver gas purge) Y4E Y4E 0 pulse expansion (Inverter cooling) Y5E Y5E Same as normal operation Solenoid (Oil separator oil return) Y1S Y1S, Y2S ON Solenoid (Liquid pipe) Y3S Y3S ON Four way (HP/LP gas pipe) Y4S Y4S Hold Four way (Heat exchanger lower) Y5S Y5S Hold Four way (Heat exchanger upper) Y6S Y6S Hold Ending condition OR A lapse of 15 minutes Tb>11 C (51.8 F) continues for 30 seconds or more Indoor unit actuator Thermostat ON unit Fan Stopping unit Thermostat OFF unit Thermostat ON unit expansion Stopping unit Thermostat OFF unit Defrost operation OFF OFF OFF Defrost EV opening degree Defrost EV opening degree Defrost EV opening degree Branch selector unit actuator expansion (EVSC) expansion (EVH) expansion (EVL) Y1E Y2E Y3E Normal cooling Normal Simultaneous Cooling / Heating Normal heating Cooling Cooling Heating Heating Thermo. ON 0 pulse 0 pulse Subcooled degree control 0 pulse Stopping 0 pulse 0 pulse 0 pulse 0 pulse Thermo. OFF 0 pulse 0 pulse 0 pulse 0 pulse Thermo. ON 6,000 pulse 0 pulse 6,000 pulse 6,000 pulse Stopping 6,000 pulse 0 pulse 6,000 pulse 6,000 pulse Thermo. OFF 6,000 pulse 0 pulse 6,000 pulse 6,000 pulse Thermo. ON 6,000 pulse 6,000 pulse 0 pulse 0 pulse Stopping 6,000 pulse 6,000 pulse 0 pulse 0 pulse Thermo. OFF 6,000 pulse 6,000 pulse 0 pulse 0 pulse Function and Control 75

88 Special Control SiUS341504E 4.4 Cooling / Heating Mode Switching [While in cooling / heating mixed mode, single-room cooling heating] First, the electronic expansion of the indoor unit in cooling operation will close, and the Y2E and Y3E electronic expansion s of the branch selector unit will all close once. Next, the Y2E electronic expansion will open little by little to perform pressure equalization. Then the electronic expansion will fully open, and the electronic expansion of the indoor unit will open to activate the heating circuit. The required switching time is approximately 6 minutes. (Field settings, however, can shorten the time from 6 minutes to 4 minutes.) (1) In cooling operation Outdoor unit Branch selector unit Y1E Liquid pipe Cooling unit Y2E Y3E Dual pressure gas pipe Suction gas pipe (2) In equalization Indoor unit (close) Branch selector unit Y1E Liquid pipe Y2E (open) Y3E (close) Dual pressure gas pipe Suction gas pipe (3) To heating mode Indoor unit Branch selector unit Y1E Liquid pipe Heating unit Y2E Y3E Dual pressure gas pipe Suction gas pipe 76 Function and Control

89 Special Control [While in cooling/heating mixed mode, single-room heating cooling] First, the electronic expansion of the indoor unit in heating operation will close, and the Y2E and Y3E electronic expansion s of the branch selector unit will all close once. Next, the Y3E electronic expansion will open little by little to perform pressure equalization. Then the electronic expansion will fully open, and the electronic expansion of the indoor unit will open to activate the heating circuit. The required switching time is approximately 6 minutes. (Field settings, however, can shorten the time from 6 minutes to 4 minutes.) (1) In heating Indoor unit Branch selector unit Y1E Liquid pipe Heating unit Y2E Y3E Dual pressure gas pipe Suction gas pipe (2) In equalization Indoor unit (close) Branch selector unit Y1E Liquid pipe In equalization Y2E (open) Y3E (close) Dual pressure gas pipe Suction gas pipe (3) To cooling Indoor unit Branch selector unit Y1E Liquid pipe Cooling unit Y2E Y3E Dual pressure gas pipe Suction gas pipe Function and Control 77

90 Special Control SiUS341504E [While in all-room cooling operation All-room cooling/heating simultaneous operation] Dual pressure gas pipe Suction gas pipe Liquid pipe (1) All the indoor units in cooling operation Using the dual pressure gas pipe as a suction gas pipe. (2) Pump-down residual operation Cooling Cooling Cooling Cooling Cooling Dual pressure gas pipe Suction gas pipe Liquid pipe (3) Pre-startup control Switching between the electronic expansion s of branch selector unit. Required switching time: 30 seconds (switching control time) (While switching: The compressor stops operating.) (4) Startup control Switching the dual pressure gas pipe from low pressure to high pressure. Dual pressure gas pipe Suction gas pipe Liquid pipe (5) Into heating operation or cooling and heating simultaneous operation Each indoor unit In warm air supply operation under cool air prevention control (for 3 to 5 minutes). Heating Heating Heating Heating Heating 78 Function and Control

91 Special Control [While in all-room heating operation or cooling/heating simultaneous operation All-room cooling] Dual pressure gas pipe Suction gas pipe Liquid pipe Heating Heating Heating Heating Heating Dual pressure gas pipe Suction gas pipe Liquid pipe (1) In heating operation or cooling and heating simultaneous operation Using the dual pressure gas pipe as a suction gas pipe. (2) Pump-down residual operation (3) Pre-startup control Switching between the electronic expansion s of branch selector unit. Required switching time: 2 to 4 minutes (switching control time) (While switching: The compressor stops operating.) (4) Startup control Switching the dual pressure gas pipe from low pressure to high pressure. Vent Vent Vent Vent Vent Dual pressure gas pipe Suction gas pipe (5) Into all-unit cooling operation In cool air supply operation Liquid pipe Cooling Cooling Cooling Cooling Cooling Function and Control 79

92 Other Control SiUS341504E 5. Other Control 5.1 Backup Operation If any of the compressors goes wrong, disable the relevant compressor or the relevant outdoor unit from operating, and then conduct emergency operation only with operational compressors or outdoor units. "Emergency operation with remote controller reset" and "Emergency operation with outdoor unit PCB setting" are available Applicable model Operating method (1) Emergency operation with remote controller reset (Auto backup operation) REYQ96-168T REYQ T Backup operation by the outdoor unit (2) Emergency operation with outdoor unit PCB setting (Manual backup operation) Backup operation by the compressor Backup operation by the outdoor unit (1) Emergency operation with remote controller reset [Operating method] Reset the remote controller. (Press the ON/OFF button for 4 seconds or more.) [Details of operation] Disable the defective outdoor unit from operating, and then only operate other outdoor units. (On the system with 1 outdoor unit, this emergency operation is not available.) (2) Emergency operation with outdoor unit PCB setting [Setting method] Make setting of the compressor, "the operation of which is to be disabled", in field setting mode (setting mode 2). [Details of operation] Disable the compressor with "operation disable setting" made from operating and only operate other compressors. (On the system with 1 compressor, REYQ72T, this emergency operation is not available.) 5.2 Demand Operation In order to save the power consumption, the capacity of outdoor unit is saved with control forcibly by using Demand 1 Setting or Demand 2 Setting. To operate the unit with this mode, additional setting of Continuous Demand Setting or external input by external control adaptor for outdoor unit is required. Setting item Condition Content Demand 1 Level 1 The compressor operates at the power of 60% or less of the rating. Level 2 The compressor operates at the power of 70% or less of the rating. Level 3 The compressor operates at the power of 80% or less of the rating. Demand 2 The compressor operates at the power of 40% or less of the rating. Demand 3 Forced thermostat OFF 5.3 Heating Operation Prohibition Heating operation is prohibited when the outdoor air temperature is above 24 C (75.2 F). 80 Function and Control

93 6. Outline of Control (Indoor Unit) 6.1 Operation Flow Chart Start Turn ON power supply Initialize electronic expansion 20E Cooling Operation (Option) Aux. electric heater 52H : OFF Humidifier Mu : OFF Outline of Control (Indoor Unit) Cyclic operation with RUN/STOP push button Cooling Cooling Operation Detect louver lock LED in remote controller turns ON Run or Stop? Run Is the safety device activated? No Is the RUN indicating lamp blinking? No RUN indicating lamp: ON Airflow rate display: Displayed Wind direction display: Displayed Temp. setting display: Displayed Fan or Temp. control? Cooling or Heating? Heating Operation The previous settings of airflow ( ) rate, wind direction, and Stop Yes Yes Fan Temp. control Heating temperature are displayed. RUN indicating lamp: OFF RUN indicating lamp: Blink Error code: Displayed Press the RESET RUN/STOP push button. RUN indicating lamp: OFF Error mode display: Reset 1 2 Fan MF : Stop expansion 20E : Closed Louver MA : Stop (Option) 3 Drain pump kit MP : OFF Fan Operation Aux. electric heater 52H : OFF Humidifier Mu : OFF Swing flap Yes Swing flap Program dry ON/OFF OFF Program dry display: Reset Fan: MF Operating with set airflow rate Is Restart prevention operation in progress? (5 min.) No No ON Dew prevention condition? Set wind direction Program dry operation (Option) (Option) 4 Is freezeup prevention operation in Yes Drain pump kit progress? MP :ON No Is test run in progress? No (Option) 5 OFF Drain pump kit Thermostat status : OFF after 5-min. MP residual operation ON expansion expansion 20E : Capacity control 20E : Closed A No Yes Drain pump kit : OFF after 5-min. MP residual operation Yes Dew prevention position Cassette type: P1 Ceiling suspended type: P0 A (Option) 6 Drain pump kit 1. If any error occurs, the relevant error code will be displayed according to the error code display of the MP : ON remote controller. 2. When the aux. electric heater turns ON, the fan will stop after it conducts residual operation for 1 min. 3. When the drain pump kit turns ON, the drain pump kit will stop after it conducts residual operation for a period of 5 min. 4. If the evaporator inlet temperature is kept at not more than 5 C (23 F) for a period of cumulative 10 A min. or not more than 1 C (30.2 F) for a cumulative period of 40 min., freeze-up prevention operation will be conducted. If the evaporator inlet temperature is kept at not less than 7 C (44.6 F) for a consecutive period of 10 min., the freeze-up prevention operation will be reset. 5. Thermostat status OFF Set temperature ON Thermostat-ONoperation signal to outdoor unit: Output Suction air temperature a = b = 1 C (1.8 F) (a = b = 0.5 C (0.9 F) is only available for the FXFQ and FXHQ series.) Thermostat-ONoperation signal to outdoor unit: Output a b 6. The FXFQ series have the drain pump as standard equipment. Function and Control 81

94 Outline of Control (Indoor Unit) SiUS341504E Program dry operation Heating Operation 7 Program dry display (option) Drain pump kit MP : OFF 8 Thermostat status OFF ON Fan MF : Operating in L mode expansion 20E : Superheated degree control Fan MF : Operating in L mode after it stops for 6 min. expansion Closed 20E : (Option) Drain pump kit MP : OFF after 5-min. residual operation 12 Swing flap? Yes Swing flap Is defrost operation in progress? No Yes 12 Set wind direction A 7. Program dry display No set temperature and airflow rate of the remote controller are displayed. 8. Thermostat status Set temperature when operating the program dry mechanism. Yes No 13 Is hot starting in progress? No DEFROST/HOT START indicating lamp: OFF Restart prevention operating in progress? (4 min.) No Yes DEFROST/HOT START indicating lamp: ON Is test run in progress? a Suction air temperature b (1) 14 Thermostat status (3) (2) 9 (Option) Fan Operation Drain pump kit MP : OFF Aux. electric heater 52H : OFF Humidifier Mu : OFF Swing flap Yes Swing flap A No 11 Fan MF: Operating with set airflow rate expansion 20E : Closed 10 Set wind direction (Option) (Option) (Option) (Option) Aux. Aux. Aux. Aux. electric heater 52H : OFF electric heater 52H : OFF electric heater 52H : ON electric heater 52H : OFF Humidifier : OFF Humidifier : ON Humidifier : ON Humidifier : OFF Mu A Mu 15 Is outlet air temperature drop protection in progress? No Fan MF : Fan MF : Fan MF : Fan MF : LL operation Operating with set airflow rate Operating in L mode Stop 20E : expansion 20E : expansion expansion 20E : Closed Capacity control Open 12. Wind direction When the heating thermostat turns OFF, the wind direction will be set to 100% horizontal. 13. Hot start If the condenser inlet temperature exceeds 34 C (93.2 F) at the time of starting operation or after the completion of defrost operation, or until 3 minutes pass or Tc is above 52 C (125.6 F), hot starting will be conducted. 14. Thermostat status (3) Mu Yes Mu 9. Fan operation By setting the remote controller to Fan, the fan will operate with thermostat OFF in set temperature control operation mode. 10. Set wind direction According to wind direction instruction from the remote controller, the wind direction is set to 100% horizontal while in heating operation. 11. Fan According to fan speed instruction from the remote controller, the fan is put into operation in LL mode while in heating operation. (2) 4 C (24.8 F) 2 C (28.4 F) Set temp. Suction air temp. 15. Outlet air temperature drop protection When the set temperature is below 24 C (75.2 F) or the electronic expansion opening is small, the protection will be activated. b a (1) 82 Function and Control

95 Outline of Control (Indoor Unit) 6.2 Thermostat Control Thermostat Control While in Normal Operation VRV multi systems are set at factory to thermostat control mode using the remote controller. While in normal thermostat differential control mode (i.e., factory setting mode), the thermostat turns OFF when the system reaches a temperature of 1 C ( 1.8 F) from the set temperature while in cooling operation or of +1 C (+1.8 F) from that while in heating operation. Cooling operation: Normal operation Tr < Set temperature 1 C ( 1.8 F) Thermostat OFF Tr: Temperature detected with the suction air thermistor (R1T) Heating operation: Normal operation Tr > Set temperature +1 C (+1.8 F) Thermostat OFF While in a single remote controller group control, the suction air thermistor in the indoor unit is only used from this control. Furthermore, while in heating operation, ceiling mounted cassette type indoor units conduct the thermostat control by a value compensated by 2 C ( 3.6 F) for the value detected with the suction air thermistor in the indoor unit. (Through field settings, the thermostat differential setting can be changed from 1 C (1.8 F) to 0.5 C (0.9 F). For details on the changing procedure, refer to information on page onward.) Thermostat Control in Dry Operation While in dry operation, the thermostat control is conducted according to a suction air temperature at the time of starting the dry operation. Assuming that the suction air temperature at the time of starting the dry operation is Tro and the suction air temperature in operation is Tr, Tr < Tro 1 C ( 1.8 F) when Tro 24.5 C: (76.1 F) In dry operation Thermostat OFF Tro: Suction air temperature at the time of starting the dry operation when Tro > 24.5 C: (76.1 F) In dry operation Tr < Tro 1.5 C ( 2.7 F) Thermostat OFF Tr: Temperature detected with the suction air thermistor (R1T) Furthermore, while in dry operation mode, fans operate at L flow rate, stops for a period of 6 minutes while the thermostat is OFF, and then return to operation at L flow rate. (This control is used to prevent a rise in indoor humidity while in thermostat OFF mode.) Function and Control 83

96 Outline of Control (Indoor Unit) SiUS341504E Thermostat Control with Operation Mode Set to "AUTO" When the operation mode is set to "AUTO" on the remote controller, the system will conduct the temperature control shown below. Furthermore, setting changes of the differential value (D) can be made according to information in the "Field Setting from Remote Controller (P.100 and later)" section. Mode First code Second code No. Contents of setting No. No Differential value while in "AUTO" operation mode 0 C 1 C 7 C 0 F 1.8 F 3.6 F 5.4 F 7.2 F 9.0 F 10.8 F 12.6 F : Factory setting Set heating temperature (A D) D Set cooling temperature A Cooling thermostat ON Cooling thermostat OFF Display change Cooling Heating Display change Heating Cooling Heating thermostat OFF Heating thermostat ON 3 C (5.4 F) D 2 D ( + 2) C ( ) F (Ex.) When automatic cooling temperature is set to 27 C (80.6 F): Differential value: 0 C (0 F) Differential value set to 4 C (7.2 F) Set cooling/ heating temp. 25 C 27 C (77 F) (80.6 F) 30 C (86 F) Cooling mode Set heating temp. Set cooling temp. 23 C 26 C 27 C (73.4 F) (78.8 F) (80.6 F) Cooling mode Heating mode Differential value set to 1 C (1.8 F) Set heating temp. Set cooling temp. 26 C 27 C 24.5 C (78.8 F) (80.6 F) (76.1 F) 29 C (84.2 F) Control temp. Cooling mode Heating mode Differential value set to 5 C (9 F) Set heating temp. 22 C (71.6 F) 22.5 C (72.5 F) Set cooling temp. 25 C 27 C (77 F) (80.6 F) Control temp. Cooling mode Heating mode Differential value set to 2 C (3.6 F) Set heating temp. Set cooling temp. 25 C 27 C 28 C 24 C (77 F) (80.6 F) (82.4 F) (75.2 F) Control temp. Cooling mode Heating mode Control temp. Differential value set to 6 C (10.8 F) Set heating temp. Set cooling temp. 22 C 24 C 27 C 21 C (71.6 F) (75.2 F) (80.6 F) (69.8 F) Cooling mode Control temp. Control temp. Heating mode Differential value set to 3 C (5.4 F) Set heating temp. Set cooling temp. 24 C 23.5 C (75.2 F) (74.3 F) 27 C Heating mode (80.6 F) Cooling mode 20 C Differential value set to 7 C (12.6 F) Set heating temp C (70.7 F) (68 F) 23 C (73.4 F) Set cooling temp. 27 C (80.6 F) Cooling mode Control temp. Control temp. Heating mode Heating mode 84 Function and Control

97 Outline of Control (Indoor Unit) 6.3 Drain Pump Control Normal Operation Float switch ON OFF Thermostat (running) ON OFF Error display ON OFF Drain pump ON OFF The float switch is OFF in normal operation. When cooling operation starts (thermostat ON), the drain pump turns ON simultaneously. After the thermostat turns OFF, the drain pump continues to operate for another 5 minutes. The aim of residual operation after thermostat OFF is to eliminate the dew that condenses on the indoor heat exchanger during cooling operation If the Float Switch is ON with the Thermostat ON in Cooling Operation 5 min. Float switch ON OFF } Thermostat (running) ON OFF Error display ON OFF A3 Drain pump ON OFF 5 min. 5 sec. 5 min. 5 sec. When the float switch turns ON, the thermostat turns OFF simultaneously. After the thermostat turns OFF, the drain pump continues to operate for another 5 minutes. 1. If the float switch turns OFF again during the residual operation of the drain pump, cooling operation also turns on again (thermostat ON). 2. If the float switch remains ON even after the residual operation of the drain pump has ended, the error code A3 is displayed on the remote controller. 3. The drain pump turns OFF once residual operation has ended, then turns ON again after 5 seconds. 4. After A3 is displayed and the unit comes to an abnormal stop, the thermostat will remain OFF even if the float switch turns OFF again. Function and Control 85

98 } 2 } 3 Outline of Control (Indoor Unit) SiUS341504E If the Float Switch is ON with the Thermostat OFF in Cooling Operation Float switch ON OFF Thermostat (running) ON OFF Error display ON OFF A3 Drain pump ON OFF 5 min. 5 sec. When the float switch turns ON, the drain pump turns ON simultaneously. If the float switch remains ON even after the residual operation of the drain pump has ended, the error code A3 is displayed on the remote controller. The drain pump turns OFF once residual operation has ended, then turns ON again after 5 seconds If the Float Switch Turns ON and OFF Continuously, or the Float Switch Turns ON While AF Displayed Float switch ON OFF 1st 2nd 3rd 4th 5th } 1 Thermostat (running) ON OFF Error display ON OFF AF A3 Drain pump ON OFF 5 min. 5 min. 5 min. 5 min. 5 min. 5 min. 5 min. 5 sec. When the float switch turns ON, the drain pump turns ON simultaneously. 1: If the float switch continues to turn ON and OFF 5 times consecutively, it is judged as a drain system error and the error code AF is displayed on the remote controller. 2: The drain pump continues to turn ON/OFF in accordance with the float switch ON/OFF even after AF is displayed on the remote controller. 3: While the error code AF is displayed, if the float switch remains ON even after the residual operation of the drain pump has ended, the error code A3 will be displayed on the remote controller. 86 Function and Control

99 Outline of Control (Indoor Unit) 6.4 Control of expansion s in indoor units have the functions of conducting superheated degree control in cooling operation and subcooling degree control in heating operation. However, if the indoor units receive any control command such as a protection control command or a special control command from the outdoor unit, the units will give a priority to the control command. Superheated degree control in cooling operation This function is used to adjust the opening of the electronic expansion so that superheated degree (SH), which is calculated from the detection temperature (Tg) of the gas pipe thermistor (R3T) and the detection temperature (Tl) of the liquid temperature thermistor (R2T) of the indoor unit, will come close to a target superheated degree (SHS). At that time, correction to the superheated degree is made according to the differences ( T) between set temperature and suction air temperature. SH = Tg Tl SH: Evaporator outlet superheated degree Tg: Indoor unit gas pipe temperature (R3T) Tl: Indoor unit liquid pipe temperature (R2T) SHS (Target SH value) SHS: Target superheated degree Normally 5 C (9 F) As T (Remote controller set temp. Suction air temp.) becomes larger, SHS becomes lower. As T (Remote controller set temp. Suction air temp.) becomes smaller, SHS becomes higher. Subcooling degree control in heating operation This function is used to adjust the opening of the electronic expansion so that the high pressure equivalent saturated temperature (Tc), which is converted from the detected pressure of the high pressure sensor in the outdoor unit, and the subcooling degree (SC), which is calculated from the detected temperature (Tl) of the liquid temperature thermistor (R2T) in the indoor unit, will come close to the target subcooling degree (SCS). At that time, corrections to the subcooling degree are made according to differences ( T) between set temperature and suction air temperatures. SC = Tc Tl SC: Condenser outlet subcooling degree Tc: High pressure equivalent saturated temperature detected by the high pressure sensor (S1NPH) Tl: Indoor unit liquid pipe temperature (R2T) SCS (Target SC value) SCS: Target subcooling degree Normally 5 C (9 F) As T (Remote controller set temp. Suction air temp.) becomes larger, SCS becomes lower. As T (Remote controller set temp. Suction air temp.) becomes smaller, SCS becomes higher. Function and Control 87

100 Outline of Control (Indoor Unit) SiUS341504E 6.5 Freeze-up Prevention Freeze-up Prevention by Off Cycle (Indoor Unit) When the temperature detected by liquid pipe thermistor (R2T) of the indoor unit heat exchanger drops too low, the unit enters freeze-up prevention operation in accordance with the following conditions, and is also set in accordance with the conditions given below. When freeze-up prevention is activated, the electronic expansion is closed, the drain pump turns ON and the fan tap is fixed to L airflow. When the following conditions for stopping are satisfied, it returns. Conditions for starting freeze-up prevention Temperature is 1 C (30.2 F) or less for total of 40 minutes, or temperature is 5 C (23 F) or less for total of 10 minutes. Conditions for stopping freeze-up prevention: Temperature is 7 C (44.6 F) or more for 10 minutes continuously. 10 minutes 7 C (44.6 F) 0 C (32 F) 5 C (23 F) Freeze-up prevention operation Forced OFF by thermostat OR 7 C (44.6 F) 0 C (32 F) 1 C (30.2 F) 10 minutes t1 t2 t3 t4 t > 40 minutes 10 minutes Freeze-up prevention operation Forced OFF by thermostat 7 C (44.6 F) Conditions for starting when airflow direction is two-way or three-way Temperature is 1 C (33.8 F) or less for a total of 15 minutes or 0 C (32 F) or less for 1 minute continuously. 10 minutes 7 C (44.6 F) 10 minutes 0 C (32 F) 1 minute Freeze-up prevention operation Forced OFF by thermostat OR 1 C (33.8 F) t1 t2 t3 t4 Freeze-up prevention operation Forced OFF by thermostat t > 15 minutes 88 Function and Control

101 Outline of Control (Indoor Unit) 6.6 Heater Control (Optional PCB KRP1B... is required.) The heater control is conducted in the following manner. [Normal control] While in heating, the heater control (ON/ OFF) is conducted as shown on the right. [Overload control] When the system is overloaded in heating, the heater will be turned OFF in the following 2 manners. (1) The heater control (ON/OFF) is conducted through the liquid pipe temperature (R2T) of the indoor unit. (2) The heater control (ON/OFF) is conducted by converting the heater temperature into the condensing pressure equivalent saturated temperature (Tc) according to the temperature detection through the high ON 43 C (109.4 F) pressure sensor (S1NPH) of the outdoor unit. ON 2 C (3.6 F) Set temperature 2 C (3.6 F) ON 50 C (122 F) 60 C (140 F) [Fan residual operation] While the heater turns OFF, in order to prevent the activation of the thermal protector, the fan conducts residual operation for a given period of time after the heater turns OFF. (This operation is conducted regardless of with or without heater equipped.) Residual operation time = 100 seconds on ceiling suspended type or 60 seconds on other types OFF OFF 50 C (122 F) Liquid pipe temperature Condensing pressure equivalent saturated temperature OFF Function and Control 89

102 Outline of Control (Indoor Unit) SiUS341504E 6.7 List of Swing Flap Operations Swing flaps operate as shown in table below. Hot start from defrosting operation Fan Flap FXFQ FXHQ FXAQ Swing OFF Horizontal Horizontal Horizontal Airflow direction set OFF Horizontal Horizontal Horizontal Heating Cooling Defrosting operation Thermostat OFF Hot start from thermostat OFF mode (for prevention of cold air) Stop Thermostat ON in program dry Thermostat OFF in program dry Thermostat OFF in cooling Stop Micro-computer control (including cooling operation) Swing OFF Horizontal Horizontal Horizontal Airflow direction set OFF Horizontal Horizontal Horizontal Swing LL Horizontal Horizontal Horizontal Airflow direction set LL Horizontal Horizontal Horizontal Swing LL Horizontal Horizontal Horizontal Airflow direction set LL Horizontal Horizontal Horizontal Swing OFF Horizontal Horizontal Totally closed Airflow direction set OFF Horizontal Horizontal Totally closed Swing L ( 1) Swing Swing Swing Airflow direction set L ( 1) Set Set Set Swing Swing Swing Swing OFF or L Airflow direction set Horizontal or Set Set Set Swing Set Swing Swing Swing Airflow direction set Set Set Set Set Swing OFF Horizontal Horizontal Totally closed Airflow direction set OFF Horizontal Horizontal Totally closed Swing L Swing Swing Swing Airflow direction set L Set Set Set Note: 1. L or LL only on FXFQ models 90 Function and Control

103 Outline of Control (Indoor Unit) 6.8 Hot Start Control (In Heating Only) At startup with thermostat ON or after the completion of defrosting in heating operation, the indoor unit fan is controlled to prevent cold air from blasting out and ensure startup capacity. [Detail of operation] When either the starting condition 1 or the starting condition 2 is established, the operations shown below will be conducted. Defrost ending or oil return ending or Thermostat ON Hot start ending conditions OR lapse of 3 minutes TH2 > 34 C (93.2 F) Tc > 52 C (125.6 F) Hot start control Hot start in progress Fan Louver H/L remote controller setting LL OFF Remote controller setting Po (Horizontal) The fan is not OFF before initiating the hot start: LL The fan is OFF before initiating the hot start: OFF Normal control Normal control FXTQ At startup with thermostat ON or after the completion of defrosting in heating operation, the indoor unit fan is controlled to prevent cold air from blasting out and ensure startup capacity. [Detail of operation] When either the starting condition 1 or the starting condition 2 is established, the operations shown below will be conducted. Hot start start conditions Starting condition 1: Defrost ending or OR oil return ending Starting condition 2: Thermostat ON Hot start ending conditions lapse of 3 minutes OR TH2 > 34 C (93.2 F) Tc > 52 C (125.6 F) Hot start control H/L remote controller setting Hot start in progress Hot start delay 30 sec. Normal control Fan LL OFF The fan is not OFF before initiating the hot start: LL The fan is OFF before initiating the hot start: OFF Heater ON OFF Normal control Humidifier ON OFF The fan is ON: ON The fan is OFF: OFF Normal control TH2: Temperature detected with the gas thermistor TC : High pressure equivalent saturated temperature Function and Control 91

104 Outline of Control (Indoor Unit) SiUS341504E 6.9 Louver Control for Preventing Ceiling Dirt We have added a control feature that allows you to select the range of in which air direction can be adjusted in order to prevent the ceiling surrounding the air discharge outlet of ceiling mounted cassette type units from being soiled. (This feature is available on round flow, 4 way ceiling mounted cassette (2' 2') types.) Existing position P0 P1 P2 P3 P4 Draft prevention position P0 Standard Setting position P0 Ceiling soiling prevention position P0 Draft prevention position P1 P2 P4 P3 P0 P4 P4' P1 P3' P0' P1' P2' P4 P4'' P2 P0'' P1'' P2'' P3'' P1 P2 P3 P4 Same as existing position Range of direction adjustment Standard position Prohibited P0' P1' P2' P3' P4' Separated into 5 positions (P1-4) Range of direction adjustment Dirt prevention position Prohibited P0'' P1'' P2'' P3'' P4'' Separated into 5 positions (P2-4) The factory setting position is standard position. Note: The factory setting position of FXFQ model only (round flow) is draft prevention position. 92 Function and Control

105 Outline of Control (Indoor Unit) 6.10 Heater Control (FXTQ) Auxiliary Heater Control If heating is insufficient in heat pump system alone, an electrical heater is to be used as the auxiliary heater. The following shows the ON/OFF conditions for the electric heater. Thermostat OFF/Stop operation Fan H tap 120 seconds ( 2) Thermostat OFF Thermostat OFF Stop operation Thermostat step 1 Heat Pump: Fan normal operation Fan H tap 120 seconds ( 2) Condition A Continues for 5 minutes Timer clear Electrical heater step setting 01 Heater 1 ON Heater 2 OFF Fan H tap ( 1) Elimination of Condition A Thermostat step 3 = "ON" Continues for 5 minutes Timer clear Thermostat step 3 = "OFF" Heater 1 ON Heater 2 ON Fan H tap ( 1) Elimination of Condition A Thermostat step 4 = "ON" Continues for 5 minutes Timer clear Thermostat step 4 = "OFF" Heater 1 ON Heater 2 ON Fan H tap ( 1) Elimination of Condition A Note: 1. Fixing of the fan H tap. 2. The heater backup prohibiting conditions are prioritized. Even when the heater ON conditions are met, the heater is turned OFF when the prohibiting conditions are met. Function and Control 93

106 Outline of Control (Indoor Unit) SiUS341504E Heat Pump Lockout Mode During heating operation, users can select an electrical heater for heating. For this, signals are sent using ABC terminal of outdoor unit PCB. When the hot-water heating signal is received from the outdoor unit PCB, heating operation is performed only with the heater as manual backup operation. The ON/OFF conditions for this electrical heater are shown below. Thermostat OFF/Stop operation Fan H tap 120 seconds ( 3) Thermostat ON Thermostat OFF Stop operation Thermostat step 1 H/P Fan: Normal operation Fan H tap 120 seconds ( 3) Condition A Timer count: 5 minutes Timer clear Electrical heater step setting 01 Heater 1 ON Heater 2 OFF Fan H tap ( 1) Condition B Thermostat step 2 = "ON" Timer count: 5 minutes Timer clear Thermostat step 2 = "OFF" Heater 1 ON Heater 2 ON Fan H tap ( 1) Condition B Thermostat step 3 = "ON" Timer count: 5 minutes Timer clear Thermostat step 3 = "OFF" Heater 1 ON Heater 2 ON Fan H tap ( 1) Condition B 94 Function and Control

107 Outline of Control (Indoor Unit) Condition A Heating mode Thermostat step 1 = "ON" Not during fan residual operation & [Electrical heater setting] = "01" OR & [Electrical heater setting] = "03" Hot-water heater = "1" (ON) Condition B Elimination of Condition A Indoor unit error [Stop due to error] Indoor unit error [Abnormal stop] OR Indoor unit error [Remote control thermistor error] Indoor unit error [Suction air thermistor error] During defrosting or oil return operation Heater backup prohibiting conditions ( 2) Note: 1. Fixing of the fan H tap. 2. The heater backup prohibiting conditions are prioritized. Even when the heater ON conditions are met, the heater is turned OFF when the prohibiting conditions are met. 3. The operation must continue for a certain period of time after the heater turns OFF. 4. The thermostat steps for this control comply with the Step Thermostat Processing (FXTQ) Step Thermostat Processing (FXTQ) [Outline] The thermostat ON/OFF for the indoor unit is controlled in accordance with [Thermostat Step 1]. The heater ON/OFF operation during heating is controlled in accordance with [Thermostat Step 2, 3, or 4] or [Thermostat Step 1, 2, or 3]. For more details of the heater, see 9.10 Heater Control (FXTQ). [Detail] [Thermostat step 1] = "OFF" [Thermostat step 2] = "OFF" [Thermostat step 3] = "OFF" [Thermostat step 4] = "OFF" & Drain pump abnormal output = OFF Thermostat OFF error has not occurred. Forced thermostat OFF = "0" (OFF) Normal operation = ON Remote control operation mode = "Heating" OR Not during anti-freeze operation Elimination conditions of the above Perform the processing in the following chart. (1) Cooling (2) Heating ON OFF ON OFF [Thermostat step 2] 2 C (3.6 F) 4 C (7.2 F) [Thermostat step 1] 1 C ( 1) 1 C ( 1) (1.8 F) (1.8 F) Set temperature Controlled temperature ON OFF ON OFF ON OFF ON OFF [Thermostat step 4] 1.5 C (2.7 F) 1.5 C (2.7 F) [Thermostat step 3] [Thermostat step 2] [Thermostat step 1] 1.5 C (2.7 F) 1.5 C (2.7 F) <Ttsoff> <Ttson> 1 C ( 1) 1 C ( 1) Controlled (1.8 F) (1.8 F) temperature Set temperature Note: 1. This value varies according to the field setting Function and Control 95

108 Outline of Control (Indoor Unit) SiUS341504E 6.12 Interlocked with External Equipment (FXTQ) Humidifier When a humidifier is connected onsite, the fan operates with the airflow rate set of the remote controller or with the H tap. & & Remote control operation = ON (including thermostat OFF) External input = ON Remote control operation = ON (including thermostat OFF) When the external input changes from ON to OFF. Fan X ( 3) tap operation (Same operation as with the airflow rate selected with the remote controller) Fan residual operation for Y ( 3) seconds (The fan airflow rate is set with the X ( 3) tap.) Note: 1.This control is different from connection of humidifier and it is used for humidifiers locally connected in North America. 2.External input ON is an input signal to the X12A terminal on the PCB (A3P). 3. Refer to 2.4 Setting Contents and Code No. for Indoor Units (P.103) : Factory setting Mode No. 14 (24) First Code No. Description of Setting Second Code No Setting of humidifier / air purifier fan tap Remote controller H tap setting 5 Humidifier residual operation time 30 seconds 60 seconds 120 seconds 96 Function and Control

109 Outline of Control (Indoor Unit) Economizer When indoor and outdoor air temperatures are reversed, the compressor is stopped to let in the outdoor air to save energy. This operation is called economizer operation, and the equipment to detect indoor and outdoor air temperatures and open and close the damper to perform this operation is called an economizer. The economizer detects indoor and outdoor air temperatures, informs the air conditioner that the economizer operation is ready, and opens and closes the damper. The indoor unit stops the outdoor unit when it receives a signal from the economizer and performs air supply operation. When the indoor air temperature is cooled down sufficiently by the economizer operation, and it is no longer necessary (thermostat OFF), the indoor unit outputs a signal to the economizer to close the damper. Stop Thermostat ON signal ( 1) to the economizer. & Cooling mode When the thermostat is ON Elimination of others Transfer Thermostat ON signal ( 1) to the economizer. Normal operation & Cooling mode When the thermostat is ON External input = ON ( 2) Elimination of others Transfer the thermostat OFF state to the outdoor unit. ( 3) EV = 0 pulse The remote controller indicates cooling operation. The fan tap follows the remote controller. Stop indoor unit ON signal ( 4) to the economizer. Remote control ON Remote control OFF Transfer indoor unit ON signal ( 4) to the economizer. Note: 1. Thermostat ON signal: A signal to turn ON the indoor unit thermostat and allow the economizer to open the damper. It turns ON the relay on the X8A side of X23A on the PCB (A3P). 2. External input ON is an input signal to the X11A terminal on the PCB (A3P). 3. To stop the compressor while the economizer is in operation to save energy. 4. Remote control ON signal: Contact output which shows the operating status of the indoor unit. This signal turns on the relay on the opposite side of X8A of X23A on the PCB (A3P) Air Purifier (UV lamp) When an air purifier is connected onsite, the fan is operated with the airflow rate set of the remote controller or with the H tap. & Remote control operation (including thermostat OFF) External input = ON ( 1) Fan x tap operation (Same operation as with the airflow rate selected with the remote controller) Note: 1. External input ON is an input signal to the X25A terminal on the PCB (A3P). Function and Control 97

110 Part 5 Field Settings 1. Test Operation Checks before Test Operation Test Operation Checks Field Setting from Remote Controller Wired Remote Controller Wireless Remote Controller Simplified Remote Controller Setting Contents and Code No. for Indoor Units Field Setting from Outdoor Unit Accessing the BS Buttons on the Logic Board Operating the BS Buttons and DIP Switches on the Logic Board Connecting of the Optional PC Configurator Cable to the Outdoor Unit Monitoring Function and Field Settings Cool / Heat Mode Changeover Setting of Low Night Noise Operation and Demand Operation Charging Refrigerant Precautions Calculating the Additional Refrigerant Charge Method for Adding Refrigerant Field Settings

111 1. Test Operation 1.1 Checks before Test Operation Before carrying out a test operation, proceed as follows: Step Action 1 Make sure the voltage at the primary side of the safety breaker is: (230V or 460V) ± 10% for 3-phase units 2 Fully open the liquid and the gas stop. Test Operation 1.2 Test Operation Checks To carry out a test operation, check the following: Check that the temperature setting of the remote controller is at the lowest level in cooling mode or use test mode. Go through the following checklist: Checkpoints Cautions or warnings Are all units securely installed? Dangerous for turning over during storm Possible damage to pipe connections Is the earth wire installed according to the applicable local standard? Dangerous if electric leakage occurs Are all air inlets and outlets of the indoor and outdoor units unobstructed? Poor cooling Poor heating Does the drain flow out smoothly? Water leakage Is piping adequately heat-insulated? Water leakage Have the connections been checked for gas leakage? Poor cooling Poor heating Stop Is the supply voltage conform to the specifications on the name plate? Incorrect operation Are the cable sizes as specified and according to local regulations? Damage of cables Are the remote controller signals received by the unit? No operation Field Settings 99

112 Field Setting from Remote Controller 2. Field Setting from Remote Controller SiUS341504E Individual function of indoor unit can be changed from the remote controller. At the time of installation or after service inspection / repair, make the field setting in accordance with the following description. Wrong setting may cause error. (When optional accessory is mounted on the indoor unit, setting for the indoor unit may be required to change. Refer to information in the option handbook.) 2.1 Wired Remote Controller BRC1E73 (1) <Basic screen> 1. Press and hold Cancel button for 4 seconds or more. Service settings menu is displayed. (3) (4) (5) Press and hold Cancel button for 4 seconds or more during backlight lit. <Service Settings menu screen> (2) In the case of individual setting per indoor unit Press Menu/OK button. <Service Settings screen> (3) (5) Press Menu/OK button. In the case of group total setting SECOND CODE. FIRST CODE (SW). 2. Select Field Settings in the Service Settings menu, and press Menu/OK button. Field settings screen is displayed. 3. Highlight the mode, and select desired Mode No. by using (Up/Down) button. 4. In the case of setting per indoor unit during group control (When Mode No. such as 20, 21, 22, 23, 25 are selected), highlight the unit No. and select Indoor unit No. to be set by using (Up/Down) button. (In the case of group total setting, this operation is not needed.) In the case of individual setting per indoor unit, current settings are displayed. And, SECOND CODE. - means no function. 5. Highlight SECOND CODE. of the FIRST CODE. to be changed, and select desired SECOND CODE. by using (Up/Down) button. Multiple identical mode number settings are available. In case of setting for all indoor units in the remote control group, available SECOND CODE. is displayed as which means it can be changed. When SECOND CODE. is displayed as -, there is no function. 100 Field Settings

113 Field Setting from Remote Controller (6) (7) <Setting confirmation screen> 6. Press Menu/OK button. Setting confirmation screen is displayed. 7. Select Yes and press Menu/OK button. Setting details are determined and field settings screen returns. 8. In the case of multiple setting changes, repeat (3) to (7). Press Menu/OK button. 9. After all setting changes are completed, press Cancel button twice. TE Setting confirmation 2.2 Wireless Remote Controller 10. Backlight goes out, and Checking the connection. Please standby. is displayed for initialization. After the initialization, the basic screen returns. Installation of optional accessories on the indoor unit may require changes to field settings. See the manual of the optional accessory. For field setting details related to the indoor unit, see installation manual shipped with the indoor unit. MODE. FIELD SETTING MODE SECOND CODE. FIRST CODE. 2 1, 6 1. When in the normal mode, press the button for 4 seconds or more, and operation then enters the field setting mode. 2. Select the desired mode No. with the button. 3. Pressing the button, select the first code No. 4. Pressing the button, select the second code No. 5. Press the timer button and check the settings. 6. Press the button to return to the normal mode. (Example) When setting the filter sign time to Contamination Heavy in all group unit setting, set the Mode No. to 10, First code No. to 0 and second code No. to 02. Field Settings 101

114 Field Setting from Remote Controller SiUS341504E 2.3 Simplified Remote Controller MODE. UNIT. 3 3 FIRST CODE. SECOND CODE Remove the upper part of remote controller. 2. When in the normal mode, press the [BS6] BUTTON ( ) (field setting), and the FIELD SETTING MODE is entered. 3. Select the desired MODE No. with the [BS2] BUTTON ( ) (temperature setting ) and the [BS3] BUTTON ( ) (temperature setting ). 4. During group control, when setting by each indoor unit (mode No. 20, 22, and 23 have been selected), press the [BS8] ( ) BUTTON (unit No.) and select the INDOOR UNIT. to be set. (This operation is unnecessary when setting by group.) 5. Press the [BS9] BUTTON ( ) (set A) and select FIRST CODE. 6. Press the [BS10] BUTTON ( ) (set B) and select SECOND CODE. 7. Press the [BS7] BUTTON ( ) (set/cancel) once and the present settings are SET. 8. Press the [BS6] BUTTON ( ) (field setting) to return to the RMAL MODE. 9. (Example) If during group setting and the time to clean air filter is set to FILTER CONTAMINATION - HEAVY, SET MODE. to 10, FIRST CODE. to 0, and SECOND CODE. to Field Settings

115 Field Setting from Remote Controller 2.4 Setting Contents and Code No. for Indoor Units Mode No. ( 2) 10(20) 11(21) 12(22) 13(23) 14 (24) First Code No. 0 Setting Contents Sign Setting (Setting for display time to clean air filter) (Sets display time to clean air filter to half when there is heavy filter contamination.) Ultra long life filter Long life filter Light : Factory setting Second Code No Approx. 10,000 hrs. Approx. 2,500 hrs. Approx. 200 hrs. Heavy Approx. 5,000 hrs. Approx. 1,250 hrs. Approx. 100 hrs. Standard filter 0 ( 6) Sign Setting Light Heavy 1 Ultra Long Life Sign Setting Long life filter Ultra long life filter 1 ( 6) cleaning sign time (Light/Heavy) 2,500/1,250 10,000/5,000 2 Selection of Thermistor Remote controller + Suction air thermistor 2 ( 6) Remote sensor and remote controller thermistor Both Only suction air thermistor Only remote sensor thermistor Only remote controller thermistor Only remote controller thermistor 3 " Cleaning" Displayed or Not Displayed Display No display Remote controller Remote controller 6 Remote controller thermostat control during the group control thermostat control thermostat control is not permitted is permitted 7 Auxiliary electric heater ON/OFF temperature Refer to P.108 for detail. 1 Auxiliary electric heater ON temperature: Ttson ( 8) Refer to P.108 for detail. Auxiliary electric heater OFF temperature: Ttsoff 2 ( 8) 3 Setting the airflow rate when heating Standard Slightly increased Increased 6 Setting the rate of human detection High sensitivity Low sensitivity Standard sensitivity Infrared presence sensor disabled 7 Airflow adjustment OFF Completion of airflow adjustment Start of airflow adjustment 8 Compensating the temperature around human Suction air temperature only Priorities given on Priorities given the suction air Standard on the floor temperature temperature 9 Compensating the floor temperature 4 C ( 7.2 F) 2 C ( 3.6 F) 0 C (0 F) +2 C (+3.6 F) 0 Optional Output Switching (field selection of output for adaptor for wiring) Refer to P.110 for detail. External ON/OFF Input 1 (Set when ON/OFF is to be controlled from Refer to P.110 for detail. outside.) 2 Thermostat Switching (Set when remote sensor is to be used.) 1 C (1.8 F) 0.5 C (0.9 F) ( 7) 3 Airflow Setting when Heating Thermostat is OFF LL Set fan speed Setting of Operation Mode to "AUTO" 4 (automatic temperature differential setting for Refer to P.111 for detail. VRV system Heat Recovery series cool/heat) 5 Auto Restart after Power Failure Reset Not equipped Equipped 6 Airflow when Cooling Thermostat is OFF LL Set fan speed 0 Setting of Normal Airflow N H S 1 Airflow Direction Setting (Set when a blocking pad kit has been installed.) F (4 directions) T (3 directions) W (2 directions) 2 Swing pattern settings (In case of an infrared floor sensor is installed) All direction synchronized swing Facing swing 3 Operation of downward flow flap: Yes/No Equipped Not equipped 4 Setting of Airflow Direction Adjustment Range Draft prevention Standard Ceiling Soiling prevention 5 Setting of the Static Pressure Selection Standard High static pressure 6 External Static Pressure Settings Refer to P.113 for detail. 4 ( 6) Setting of Humidifier / Air Purifier Fan Tap Remote controller setting H tap 5 ( 6) Residual Operation Time 30 seconds 60 seconds 120 seconds Field Settings 103

116 Field Setting from Remote Controller SiUS341504E Mode No. ( 2) 15(25) First Second Code No. Code No. Setting Contents Humidification when Heating Thermostat is OFF Not equipped Equipped Setting of Direct Duct Connection 2 (when the indoor unit and energy recovery ventilator unit are connected by duct directly.) Not equipped Equipped ( 5) 3 Interlocked Operation between Humidifier and Drain Pump Not equipped Equipped 5 Individual Setting of Ventilation Not equipped Equipped 1b (2b) 3 Display of Contact Center Displayed Not displayed 4 Display of error codes on the remote controller Two-digit display Four-digit display 12 Key-lock pattern settings No operation allowed (Cancel procedure is displayed.) No operation allowed (Cancel procedure is not displayed.) No menu operation is allowed (Cancel procedure is displayed.) No menu operation is allowed any time. 14 Setting "restricted / permitted" of airflow block Refer to P.115 for detail. 1c (2c) 0 Room temperature display Room temperature is not displayed Room temperature is displayed Note : 1. Settings are made simultaneously for the entire group, however, if you select the mode No. inside parentheses, you can also set by each individual unit. Setting changes however cannot be checked except in the individual mode for those in parentheses. 2. The mode numbers inside parentheses cannot be used by wireless remote controllers, so they cannot be set individually. Setting changes also cannot be checked. 3. Do not make settings other than those described above. Nothing is displayed for functions the indoor unit is not equipped with or Checking the connection. Please stand by. may be displayed to indicate the remote controller is resetting when returning to the normal mode. 5. If the setting mode to Equipped, energy recovery ventilator fan conducts the fan residual operation by linking to indoor unit. 6. Only for FXTQ 7. For FXTQ: Factory setting is Thermostat ON Set temperature <Ttsoff> <Ttson> Thermostat OFF 104 Field Settings

117 Field Setting from Remote Controller Applicable Range of Field setting Setting Modes Ceiling mounted cassette type Slim ceiling mounted duct type Ceiling mounted duct type Ceiling suspended type Wall mounted type Floor standing type Concealed floor standing type Air handling unit 4-way blow ceiling suspended cassette type Round flow 4 way flow FXFQ FXZQ FXDQ FXMQ FXHQ FXAQ FXLQ FXNQ FXTQ FXUQ sign Ultra long life filter sign Remote controller Set fan speed when thermostat OFF Airflow adjustment ceiling height Airflow direction Airflow direction adjustment (Down flow operation) Airflow direction adjustment range Field setting fan speed selection 1 1 Auxiliary electric heater ON/OFF temperature (FXFQ-T only) 1. Static pressure selection Field Settings 105

118 Field Setting from Remote Controller SiUS341504E Detailed Explanation of Setting Modes Sign Setting If switching the filter sign ON time, set as given in the table below. Mode No. FXTQ Ultra Long Life Sign Setting When a Ultra long life filter is installed, the filter sign timer setting must be changed. Mode No. First Code No. Second Code No. Setting 01 Long Life 10 (20) 1 02 Ultra Long Life FXTQ First Code No. 10 (20) 0 Second Code No. Standard Long Life Ultra Long Life Setting hrs. 2,500 hrs. 10,000 hrs. Contamination Light hrs. 1,250 hrs. 5,000 hrs. Contamination Heavy Mode No. First Code No. Second Code No. Setting 01 Light 10 (20) 0 02 Heavy Mode No. First Code No. Second Code No. Display time (Light/Heavy) 01 2,500/1, (20) ,000/5,000 Selection of Thermistor Select a thermistor to control room temperature. When the unit is not equipped with an infrared floor sensor: Mode No. First Code No. Second Code No. Thermistor that controls room temperature 10 (20) 2 01 Room temperature thermistor in remote controller and suction air thermistor for indoor unit 02 Suction air thermistor for indoor unit 03 Room temperature thermistor in remote controller The factory setting for the Second Code No. is "01" and room temperature is controlled by the suction air thermistor and room temperature thermistor in remote controller. When the Second Code No. is set to "02", room temperature is controlled by the suction air thermistor. When the Second Code No. is set to "03", room temperature is controlled by the room temperature thermistor in remote controller. 106 Field Settings

119 Field Setting from Remote Controller Set temperature Set temperature ( F) ( C) ( F) ( C) ( C) ( F) Suction air temperature In heating In cooling Suction air thermistor Suction air thermistor Suction air thermistor Suction air thermistor Remote controller thermistor Remote controller thermistor Remote controller thermistor Remote controller thermistor Suction air thermistor Suction air thermistor Suction air thermistor Suction air thermistor Suction air temperature ( C) ( F) When the unit is equipped with an infrared floor sensor: Mode No. First Code No. Second Code No. 10 (20) (21) The thermistor to be used Remote controller thermistor Suction air thermistor Infrared floor sensor The infrared floor sensor is not used Only the suction air thermistor is used Priorities given on the suction air temperature ( ) Standard setting (Factory setting) Priorities given on the floor temperature ( ) Only the remote controller thermistor is used Refer to "Compensating the temperature around human." Note that the control is automatically switched to the one performed only by the suction air thermistor for indoor unit when the Second code No. is "01" during the group control. To use the remote controller thermistor during the group control, select the Second code No. "02" in First code No. "6." Mode No. First Code No. Second Code No. Note 01 The remote controller thermostat control is not permitted during the group control 10 (20) 6 02 The remote controller thermostat control is permitted during the group control Field Settings 107

120 Field Setting from Remote Controller SiUS341504E " Cleaning" Displayed or Not Displayed Whether or not to display " Cleaning" after operation of certain duration can be selected. Mode No. First Code No. Second Code No. " Cleaning" display 01 Display 10 (20) 3 02 No display " Cleaning" is not displayed when an Auto-clean Panel is connected. Auxiliary Electric Heater ON/OFF Temperature Setting Thermostat ON Set temperature <Ttsoff> <Ttson> Thermostat OFF Mode No. 11 (21) First Code No. Symbol 1 <Ttson> 2 <Ttsoff> Second Code No C ( 7.2 F) 2 C ( 3.6 F) 3.5 C ( 6.3 F) 1.5 C ( 2.7 F) 3 C ( 5.4 F) 1 C ( 1.8 F) 2.5 C ( 4.5 F) 0.5 C ( 0.9 F) 2 C ( 3.6 F) 0 C (0 F) 1.5 C ( 2.7 F) 0.5 C (0.9 F) FXTQ, FXMQ-PB Mode No. First Code No. 10 (20) 7 Symbol <Ttson> <Ttsoff> Second Code No C ( 7.2 F) 2 C ( 3.6 F) 3.5 C ( 6.3 F) 1.5 C ( 2.7 F) 3 C ( 5.4 F) 1 C ( 1.8 F) 2.5 C ( 4.5 F) 0.5 C ( 0.9 F) 2 C ( 3.6 F) 0 C (0 F) 1.5 C ( 2.7 F) 0.5 C (0.9 F) There is a limitation of combination between Ttson and Ttsoff as below due to 2 C (3.6 F) hysteresis required for reliability. The combinations shown with N/A cannot be selected. <Ttson> Second Code No C 3.5 C 3 C 2.5 C 2 C 1.5 C ( 7.2 F) ( 6.3 F) ( 5.4 F) ( 4.5 F) ( 3.6 F) ( 2.7 F) C (0.9 F) 05 0 C (0 F) N/A C ( 0.9 F) N/A N/A 03 1 C ( 1.8 F) N/A N/A N/A C ( 2.7 F) N/A N/A N/A N/A 01 2 C ( 3.6 F) N/A N/A N/A N/A N/A <Ttsoff> 108 Field Settings

121 Field Setting from Remote Controller Setting the Airflow Rate when Heating The fan revolution is changed to maintain the sufficient distance for warm air to reach during the heating operation. The setting should be changed depending on the installation condition of the unit. Second Code No. Mode No. First Code No (21) 3 Standard Slightly increased Increased Note that this setting is effective only during the heating operation. Setting the Rate of Human Detection (For units with the infrared presence sensor only) Set the sensitivity of the infrared presence sensor. The infrared presence sensor can be disabled by selecting the Second code No. "04." (Note) When the infrared presence sensor is disabled, the remote controller menu does not display some functions such as the automatic draft reduction, energy-saving operation in absence and halt in absence. Mode No. First Code No. Second Code No. Contents 01 High sensitivity 11(21) 6 02 Low sensitivity 03 Standard sensitivity 04 Infrared presence sensor disabled Airflow Adjustment (AUTO) External Static Pressure Settings Make settings in either method (a) or method (b) as explained below. (a) Use the airflow auto adjustment function to make settings. Airflow auto adjustment: The volume of discharge air is automatically adjusted to the rated quantity. (b) Select External Static Pressure with Remote Controller Check that 01 (OFF) is set for the SECOND CODE No. in MODE No. 21 for airflow adjustment on an indoor unit basis in Table 4. The SECOND CODE No. is set to 01 (OFF) at factory setting. Change the SECOND CODE No. as shown in table according to the external static pressure of the duct to be connected. Mode No. First Code No. Second Code No. Airflow Adjustment 01 OFF 11 (21) 7 02 Completion of airflow adjustment 03 Start of airflow adjustment Compensating the Temperature around Human (When the unit is equipped with an infrared floor sensor) Change the ratio between the suction air temperature and floor temperature used to calculate the temperature around human. The temperature around human is calculated using the values of the suction air thermistor and the infrared floor sensor. The factory setting is "Normal" (the average value of the suction air temperature and the floor temperature is applied). However, the rate at which the suction air thermistor and the infrared floor sensor affect the temperature around human can be changed with this setting. To reflect the effect of the temperature around the ceiling, select the "Priorities given on the suction air temperature" (the Second code No. "02"). To reflect the effect of the temperature around the floor, select the "Priorities given on the floor temperature" (the Second code No. "04"). The infrared floor sensor can be disabled by selecting "Suction air temperature only" (the Second code No. "01"). Mode No. First Code No. Second Code No. Contents 01 Suction air temperature only 02 Priorities given on the suction air temperature 11 (21) 8 03 Standard 04 Priorities given on the floor temperature Field Settings 109

122 Field Setting from Remote Controller SiUS341504E Compensating the Floor Temperature (When the unit is equipped with an infrared floor sensor) Offset the detected value of the infrared floor sensor with a certain temperature. This setting should be used to have the actual floor temperature detected when, for example, the unit is installed close to a wall. Mode No. First Code No. Second Code No. Contents 01 4 C ( 7.2 F) 11 (21) C ( 3.6 F) 03 0 C (0 F) C (+3.6 F) [Actual procedure to use the setting] Although the standard setting is normally used with no problem, the setting should be changed in the following cases: Environment Operation Mode Problem Setting Value The unit is installed close to a wall or a window. High thermal capacity of the floor whose material is concrete, etc. There are many heat sources like a PC. There is a non-negligible heat source such as floor heating. Heating Heated too much Heated little +2 C (+3.6 F) 2 C to 4 C ( 3.6 F to 7.2 F) Optional Output Switching Using this setting, "operation output signal" and "abnormal output signal" can be provided. Output signal is output between terminals X1 and X2 of "adaptor for wiring", an optional accessory. Mode No. First Code No. Second Code No. Remarks 01 Indoor unit thermostat ON/OFF signal is provided Output linked with "Start/Stop" of remote controller is provided. 12 (22) 0 04 In case of "Error Display" appears on the remote controller, output is provided Only for FXMQ-PB Economizer (field supply) ON/OFF signal is provided. External ON/OFF Input This input is used for "ON/OFF operation" and "Protection device input" from the outside. The input is performed from the T1-T2 terminal of the operation terminal block in the electrical component box. F2 T1 T2 Forced stop Input A Mode No. First Code No. Second Code No. Operation by input of the signal A 01 ON: Forced stop (prohibition of using the remote controller) OFF: Permission of using the remote controller 02 OFF ON: Permission of operation ON OFF: Stop 12 (22) 1 03 ON: Operation OFF: The system stops, then the applicable unit indicates "A0". The other indoor units indicate "U9" Only for FXMQ-PB ON: Economizer (field supply) is connected. OFF: Not connected 110 Field Settings

123 Field Setting from Remote Controller Thermostat Switching Differential value during thermostat ON/OFF control can be changed. Mode No. First Code No. Second Code No. Differential value 01 1 C (1.8 F) 12(22) C (0.9 F) Airflow Setting when Heating Thermostat is OFF This setting is used to set airflow when heating thermostat is OFF. When thermostat OFF airflow volume up mode is used, careful consideration is required before deciding installation location. Mode No. First Code No. Second Code No. Setting 01 LL airflow 12 (22) 3 02 Preset airflow Setting of Operation Mode to "AUTO" This setting makes it possible to change differential values for mode selection while in automatic operation mode. Mode No. First Code No. Auto Restart after Power Failure Reset Second Code No (22) 4 0 C 1 C 2 C 3 C 4 C 5 C 6 C (0 F) (1.8 F) (3.6 F) (5.4 F) (7.2 F) (9.0 F) (10.8 F) The automatic operation mode setting is made by the use of the "Operation Mode Selector" button. Mode No. First Code No. Second Code No. Setting 12 (22) 5 01 Not equipped 02 Equipped For the air conditioners with no setting for the function, the units will be left in the stop condition when the power supply is reset automatically after power failure reset or the main power supply is turned ON again after once turned OFF. However, for the air conditioners with the setting (same as factory setting), the units may start automatically after power failure reset or the main power supply turned ON again (return to the same operation condition as that of before power failure). For the above reasons, when the unit is set enabling to utilize Auto restart function after power failure reset, utmost care should be paid for the occurrence of the following situation. 7 C (12.6 F) Caution 1. The air conditioner starts operation suddenly after power failure reset or the main power supply turned ON again. Consequently, the user might be surprised (with question for the reason why). 2. In the service work, for example, turning OFF the main power switch during the unit is in operation, and turning ON the switch again after the work is completed start the unit operation (the fan rotates). Airflow when Cooling Thermostat is OFF This is used to set airflow to "LL airflow" when cooling thermostat is OFF. Mode No. First Code No. Second Code No. Setting 12 (22) 6 01 LL airflow 02 Preset airflow Field Settings 111

124 Field Setting from Remote Controller SiUS341504E Setting of Normal Airflow Make the following setting according to the ceiling height. The second code No. is set to 01 at the factory. In the Case of FXHQ, FXAQ Mode No. First Code No. Second Code No. Setting 01 Standard (N) 13 (23) 0 02 Slight increase (H) 03 Normal increase (S) In the Case of FXFQ12~30 Mode No. First Code No. 13 (23) 0 Second Code No. Setting 01 Standard (N) 02 High Ceiling (H) 03 Higher Ceiling (S) Ceiling height 4-way Outlets 3-way Outlets 2-way Outlets Lower than 2.7 m (8-29/32 ft) Lower than 3.0 m (9-29/32 ft) Lower than 3.5 m (11-1/2 ft) Lower than 3.0 m (9-29/32 ft) Lower than 3.3 m (10-27/32 ft) Lower than 3.5 m (11-1/2 ft) Lower than 3.5 m (11-1/2 ft) Lower than 3.8 m (12-15/32 ft) In the Case of FXFQ36 Mode No. First Code No. 13 (23) 0 Second Code No. Setting 01 Standard (N) 02 High Ceiling (H) 03 Higher Ceiling (S) Ceiling height 4-way Outlets 3-way Outlets 2-way Outlets Lower than 3.2 m (10-1/2 ft) Lower than 3.6 m (11-12/18 ft) Lower than 4.2 m (13-25/32 ft) Lower than 3.6 m (11-12/18 ft) Lower than 4.0 m (13-1/8 ft) Lower than 4.2 m (13-25/32 ft) Lower than 4.2 m (13-25/32 ft) Lower than 4.2 m (13-25/32 ft) Airflow Direction Setting Set the airflow direction of indoor units as given in the table below. (Set when sealing material kit of air discharge outlet has been installed.) The second code No. is factory set to 01. Mode No. First Code No. Second Code No. Setting 01 F: 4-direction airflow 13 (23) 1 02 T: 3-direction airflow 03 W: 2-direction airflow Swing Pattern Settings (In case of a infrared floor sensor is installed) Set the flap operation in swing mode. With the factory swing, flaps facing each other are synchronized to operate, and flaps placed side by side are set to swing in an opposite direction to agitate airflow to reduce temperature irregularity. Conventional swing operation (all direction synchronized swing) can be set onsite. Mode No. First Code No. Second Code No. Contents 13 (23) 2 01 All direction synchronized swing Facing swing 112 Field Settings

125 Field Setting from Remote Controller Setting of Airflow Direction Adjustment Range Make the following airflow direction setting according to the respective purpose. Mode No. First Code No. Second Code No. Setting 13 (23) 4 03 Downward (Ceiling soiling prevention) Some indoor unit models are not equipped with draft prevention (upward) function. Setting of the Static Pressure Selection (for FXDQ model) Model No. First Code No. Second Code No. External static pressure 13 (23) 5 External Static Pressure Settings (for FXMQ model) Mode No. First Code No. Second Code No. External Static Pressure 13 (23) Pa (0.80 inh2o) ( 2) ( 3) The Second Code No. is set to 07 (an external static pressure of 100 Pa (0.40 inh2o)) at factory setting. 1. FXMQ PB cannot be set to 30 Pa (0.12 inh2o). 2. FXMQ PB cannot be set to 110 ~ 200 Pa (0.44 ~ 0.80 inh2o). 3. FXMQ54PB cannot be set to 30 Pa (0.12 inh2o) or 150 ~ 200 Pa (0.60 ~ 0.80 inh2o). Setting of Humidifier / Air Purifier Fan Tap (for FXTQ model) Residual Operation Time (for FXTQ model) 01 Upward (Draft prevention) 02 Standard Standard (FXDQ07-12: 10 Pa (0.04 inh2o), FXDQ18 24: 30 Pa (0.12 inh2o)) High static pressure (FXDQ07-12: 15 Pa (0.06 inh2o), FXDQ18 24: 45 Pa (0.18 inh2o)) Pa (0.12 inh2o) ( 1) ( 3) Pa (0.20 inh2o) Pa (0.24 inh2o) Pa (0.28 inh2o) Pa (0.32 inh2o) Pa (0.36 inh2o) Pa (0.40 inh2o) Pa (0.44 inh2o) ( 2) Pa (0.48 inh2o) ( 2) Pa (0.52 inh2o) ( 2) Pa (0.56 inh2o) ( 2) Pa (0.60 inh2o) ( 2) ( 3) Pa (0.64 inh2o) ( 2) ( 3) Pa (0.72 inh2o) ( 2) ( 3) Mode No. First Code No. Second Code No. Setting 01 Remote controller setting 14 (24) 4 02 H tap Mode No. First Code No. Second Code No. Setting seconds 14 (24) seconds seconds Field Settings 113

126 Field Setting from Remote Controller SiUS341504E Humidification when Heating Thermostat is OFF Setting to "Humidification Setting" turns ON the humidifier if suction air temperature is 20 C (68 F) or above and turns OFF the humidifier if suction air temperature is 18 C (64.4 F) or below when the heating thermostat is OFF. Mode No. First Code No. Second Code No. Setting 01 Not equipped 15 (25) 1 02 Setting of humidifier Setting of Direct Duct Connection This is used when "fresh air intake kit equipped with fan" is connected. The indoor fan carries out residual operation for one minute after the thermostat is stopped. (For the purpose of preventing dust on the air filter from falling off.) Mode No. First Code No. Second Code No. Contents 01 Without direct duct connection 15 (25) 2 02 With direct duct connection equipped with fan Interlocked Operation between Humidifier and Drain Pump This is used to interlock the humidifier with the drain pump. When water is drained out of the unit, this setting is unnecessary. Mode No. First Code No. Second Code No. Contents 01 Individual operation of humidifier 15 (25) 3 Individual Setting of Ventilation This is set to perform individual operation of Energy recovery ventilator using the remote controller/central unit when Energy recovery ventilator is built in. (Switch only when Energy recovery ventilator is built in.) Mode No. First Code No. Second Code No. Contents 01 Not equipped 15 (25) 5 02 Individual operation of ventilation Display of Contact Center (For BRC1E73 only) You can turn OFF the display of "DAIKIN Contact Center" as "Contact for Service Display." Mode No. First Code No. Second Code No. Contents 01 Displayed 1b (2b) 3 02 Not displayed Display of Error Codes on the Remote Controller (For BRC1E73 only) Error code (four digits) is displayed for limited products. Select two-digit display if four-digit display is not preferred. Mode No. First Code No. Second Code No. Contents 1b (2b) 4 02 Interlocked operation between humidifier and drain pump 02 Two-digit display 04 Four-digit display 114 Field Settings

127 Field Setting from Remote Controller Key-lock Pattern Settings (For BRC1E73 only) Setting of key-lock pattern for the remote controller Mode No. First Code No. Second Code No. Contents 1b (2b) No operation allowed (Cancel procedure is displayed.) 02 No operation allowed (Cancel procedure is not displayed.) 03 No menu operation is allowed. 04 No menu operation is allowed any time. When the Second code No. is set to "04," no menu operation is allowed without key-lock by pressing and holding the menu button. Set the Second code No. to other than "4" to cancel it. Setting "Restricted / Permitted" of Airflow Block (For Sensing flow type only) Due to possibility of dew condensation, the airflow block function cannot be enabled when closure material kit, fresh air intake kit, natural / separately installed evaporation humidifier, or branch air duct. This setting will prevent the airflow bock is advertently set to ON. Ensure that this setting is "Disable airflow block" when using together with options listed above. Mode No. First Code No. Second Code No. Contents 1b (2b) Airflow block permitted Airflow block restricted Room Temperature Display (For BRC1E73 only) A "Detailed display screen" can be selected as the display screen. This setting is used if you do not want to display "Room temperature display" on the "Detailed display screen." Mode No. First Code No. Second Code No. Contents 1c (2c) 0 01 Room temperature is not displayed. 02 Room temperature is displayed. Field Settings 115

128 Field Setting from Remote Controller SiUS341504E Centralized Control Group No. Setting BRC1E Type In order to conduct the centralized remote control using the central remote controller and the unified ON/OFF controller, Group No. settings should be made by group using the operating remote controller. Make Group No. settings for centralized remote control using the operating remote controller. (1) <Basic screen> 1. Press and hold Cancel button for 4 seconds or more. Service Settings menu in displayed. (2) <Service Settings menu screen> 2. Select Group Address, and press Menu/OK button. Group Address screen is displayed. (3) <Group Address> 3. Select Group Address (Group), and press Menu/OK button. Group Address (Group) screen is displayed. (3) <Group Address (Group)> 4. Select the group No. by using (Up/Down) button. Press Menu/OK button. Note: For wireless remote controller, see the following. For setting group No. of Energy recovery ventilator and wiring adaptor for other air conditioners, etc., refer to the installation manual attached. TICE Enter the group No. and installation place of the indoor unit into the attached installation table. Be sure to keep the installation table with the operation manual for maintenance. 116 Field Settings

129 Field Setting from Remote Controller BRC7C Type / BRC7E Type / BRC4C Type Group No. setting by wireless remote controller for centralized control 1. When in the normal mode, press button for 4 seconds or more, and operation then enters the field setting mode. 2. Set mode No. 00 with button. 3. Set the group No. for each group with button (advance/backward). 4. Enter the selected group numbers by pressing button. 5. Press button and return to the normal mode. MODE No. FIELD SETTING MODE 3 4 GROUP No. 2 1, 5 Group No. Setting Example Indoor/Outdoor Outdoor/Outdoor Indoor/Outdoor Outdoor/Outdoor Central Remote Controller F1 F2 F1 F2 F1 F2 F1 F2 F1 F2 F1 F2 P1 P2 F1 F2 P1 P2 F1 F2 P1 P2 F1 F2 P1 P2 RC 1-00 Main RC RC Sub RC Group Control by Remote Controller (Automatic unit address) F1 F2 P1 P2 F1 F2 P1 P2 F1 F2 P1 P2 F1 F2 P1 P2 No Remote Controller 1-03 RC 1-04 Caution When turning the power supply ON, the unit may often not accept any operation while 88 is displaying after all indications were displayed once for about 1 minute on the liquid crystal display. This is not an operative fault. Field Settings 117

130 Field Setting from Remote Controller SiUS341504E Outdoor-Air Processing Unit - Field Setting (Remote Controller) : Factory setting Mode No. 10 (20) 12 (22) 14 (24) First Code No. Setting Contents Second Code No contamination 2500 hr 1250 hr Display time to clean air filter calculation External ON/OFF input Power failure automatic reset Discharge pipe temperature (cooling) Display Forced OFF No display ON/OFF control Not equipped Equipped C F Setting of Operation Control Mode from Remote Controller (Field Setting) The operation control mode is compatible with a variety of controls and operations by limiting the functions of the operation remote controller. Furthermore, operations such as remote controller ON/OFF can be limited in accordance with the combination conditions. (Refer to information in the next page.) Central remote controller is normally available for operations. (Except when centralized monitor is connected) Contents of Control Modes 20 modes consisting of combinations of the following 5 operation modes with temperature and operation mode setting by remote controller can be set and displayed by operation modes 0 through 19. ON/OFF control impossible by remote controller Used when you want to turn ON/OFF by central remote controller only. (Cannot be turned ON/OFF by remote controller.) OFF control only possible by remote controller Used when you want to turn ON by central remote controller only, and OFF by remote controller only. Centralized Used when you want to turn ON by central remote controller only, and turn ON/OFF freely by remote controller during set time. Individual Used when you want to turn ON/OFF by both central remote controller and remote controller. Timer operation possible by remote controller Used when you want to turn ON/OFF by remote controller during set time and you do not want to start operation by central remote controller when time of system start is programmed. 118 Field Settings

131 Field Setting from Remote Controller How to Select Operation Mode Whether operation by remote controller will be possible or not for turning ON/OFF, controlling temperature or setting operation mode is selected and decided by the operation mode given on the right edge of the table below. Example ON by remote controller (Unified ON by central remote controller) Rejection OFF by remote controller (Unified OFF by central remote controller) Rejection OFF by remote controller Rejection Temperature control by remote controller Acceptance Operation mode setting by remote controller Acceptance Control mode is "1". : Factory setting Control mode ON/OFF control impossible by remote controller OFF control only possible by remote controller Centralized Individual Timer operation possible by remote controller Unified operation, individual operation by central remote controller, or operation controlled by timer Rejection (Example) Acceptance Acceptance (During timer at ON position only) Operation Control by remote controller Unified OFF, individual stop by central remote controller, or timer stop Rejection (Example) Acceptance Rejection (During timer at OFF position only) Control mode Rejection 19 Do not select timer operation possible by remote controller if not using a remote controller. Operation by timer is impossible in this case. OFF Rejection (Example) Acceptance Temperature control Rejection Acceptance (Example) Rejection Acceptance Rejection Acceptance Rejection Acceptance Rejection Acceptance Operation mode setting Local remote controllers cannot set temperature or operation mode when the system is under centralized control and "CENTRAL CONTROL" is displayed on the screen. Acceptance 0 Rejection 10 Acceptance (Example) 1 (Example) Rejection 11 Acceptance 2 Rejection 12 Acceptance 3 Rejection 13 Acceptance 4 Rejection 14 Acceptance 5 Rejection 15 Acceptance 6 Rejection 16 Acceptance 7 Rejection 17 Acceptance 8 Rejection 18 Acceptance 9 Field Settings 119

132 Field Setting from Outdoor Unit SiUS341504E 3. Field Setting from Outdoor Unit To continue the configuration of the VRV IV heat recovery system, it is required to give some input to the logic board of the unit. This chapter will describe how manual input is possible by operating the BS buttons/dip switches on the logic board and reading the feedback from the 7 segment displays. For VRV IV heat recovery system it is alternatively possible to make several commissioning field setting through a personal computer interface (for this, option EKPCCAB1 is required). The installer can prepare the configuration (off-site) on PC and afterwards upload the configuration to the system. 3.1 Accessing the BS Buttons on the Logic Board It is not required to open the complete electronic component box to access the BS buttons on the logic board and read out the 7 segment display(s). To access you can remove the front plate (see figure). Now you can open the inspection cover of the electrical component box front plate (see figure). You can see the three BS buttons and the three 7 segment displays and DIP switches Front plate 2 Inspection cover 3 Main PCB with 3sevensegmentdisplay and 3 BS buttons Operate the switches and BS buttons with an insulated stick (such as a closed ball-point pen) to avoid touching of live parts. Location of the segment displays, buttons and DIP switches: 1 2 BS1BS2BS3 DS1 DS2 X27A BS1 MODE for changing the set mode BS2 SET for field setting BS3 RETURN for field setting DS1, DS2 DIP switches 1 7segment displays (3x) 2 BS buttons 120 Field Settings

133 Field Setting from Outdoor Unit 3.2 Operating the BS Buttons and DIP Switches on the Logic Board Operating the BS buttons By operating the BS buttons it is possible to: Perform special actions (testrun, etc). Perform field settings (demand operation, low noise, etc). Below procedure explains how to operate the BS buttons to reach the required mode in the menu, select the correct setting and modify the value of the setting. This procedure can be used any time special settings and regular field setting are discussed in this manual. Setting definition: [A-B] = C; A = mode; B = setting; C = setting value. A, B and C are numerical values for field settings. Parameter C has to be defined. It can be a chosen from a set (0, 1, 2, 3, 4, 5, ) or regarded as an ON/ OFF (1 or 0) depending on the contents. This is informed when the field setting is explained. INFORMATION During special operation (e.g., test run, etc.) or when an error happened, information will contain letters and numerical values. Functions of the BS button switches which are located on the outdoor unit PCB (A1P) Turn ON the power supply of the outdoor unit and all indoor units. When the communication between indoor units and outdoor unit(s) is established and normal, the segment indication state will be as below (default situation when shipped from factory). When turning ON the power supply: flashing as indicated. First checks on power supply are executed (1 ~ 2 minutes). When no trouble occurs: lighted as indicated (8 ~ 10 minutes). Ready for operation: blank display indication as indicated. Segment display indications: Off Blinking On When above situation cannot be confirmed after 12 minutes, the error code can be checked on the indoor unit user interface and the outdoor unit segment display. Solve the error code accordingly. The communication wiring should be checked at first. INFORMATION During special operation (e.g., test run, etc.) or when an error happened, information will contain letters and numerical values. Field Settings 121

134 Field Setting from Outdoor Unit SiUS341504E Accessing modes BS1 is used to change the mode you want to access. Access mode 1 Press BS1 once. Segment indication changes to: Access mode 2 Press BS1 for at least 5 seconds. Segment indication changes to: INFORMATION If you get confused in the middle of the process, press BS1. Then it returns to idle situation (no indication on segment displays: blank) Mode 1 Mode 1 is used to set basic settings and to monitor the status of the unit. Changing and access the setting in mode 1: Once mode1 is selected (press BS1 once), you can select the wanted setting. It is done by pushing BS2. Accessing the selected setting's value is done by pressing BS3 once. To quit and return to the initial status, press BS1. Example: Checking the content of parameter [1-10] (to know how many indoor units are connected to the system). [A-B] = C in this case defined as: A = 1; B = 10; C = the value we want to know/monitor: Make sure the segment indication is as during normal operation (default situation when shipped from factory). Press BS1 once; result segment display: Result: mode 1 is accessed. Press BS2 10 times; result segment display: Result: mode 1 setting 10 is addressed. Press BS3 1 time; the value which is returned (depending on the actual field situation), is the amount of indoor units which are connected to the system. Result: mode1 setting 10 is addressed and selected, return value is monitored information To leave the monitoring function, press BS1 once, you will return to the default situation when shipped from factory. Mode 2 Mode 2 is used to set field settings of the outdoor unit and system. Changing and access the setting in mode 2: Once mode 2 is selected (press BS1 for more than 5 seconds), you can select the wanted setting. It is done by pressing BS2. Accessing the selected setting's value is done by pressing BS3 once. To quit and return to the initial status, press BS1. Changing the value of the selected setting in mode 2: - Once mode 2 is selected (press BS1 for more than 5 seconds) you can select the wanted setting. It is done by pressing BS2. - Accessing the selected setting's value is done by pressing BS3 once. - Now BS2 is used to select the required value of the selected setting. - When the required value is selected, you can define the change of value by pressing BS3 once. - Press BS3 again to start operation according to the chosen value. 122 Field Settings

135 Field Setting from Outdoor Unit Example: Checking the content of parameter [2-18] (to define the high static pressure setting of the outdoor unit's fan). [A-B] = C in this case defined as: A = 2; B = 18; C = the value we want to know/change Make sure the segment indication is as during normal operation (default situation when shipped from factory). Press BS1 for over 5 seconds; result segment display: Result: mode 2 is accessed. Press BS2 18 times; result segment display: Result: mode 2 setting 18 is addressed. Press BS3 once; the value which is returned (depending on the actual field situation), is the status of the setting. In the case of [2-18], default value is "0", which means the function is not active. Result: mode2 setting 18 is addressed and selected, return value is the current setting situation. To change the value of the setting, press BS2 till the required value appears on the segment indication. When achieved, define the setting value by pressing BS3 once. To start operation according to the chosen setting, confirm again by pressing BS3. To leave the monitoring function, press BS1 2 times, you will return to the default situation when shipped from factory. Operating the DIP switches By operating the DIP switches it is possible to: What to do with DIP switch DS1 T USED DO T CHANGE THE FACTORY SETTING What to do with DIP switch DS2 T USED DO T CHANGE THE FACTORY SETTING Field Settings 123

136 Field Setting from Outdoor Unit SiUS341504E 3.4 Monitoring Function and Field Settings The operation of the outdoor unit can further be defined by changing some field settings. Next to making field settings it is also possible to confirm the current operation parameters of the unit. The setting can also be performed via the PC configuration software. Below relevant Monitoring mode (mode 1) and Field setting mode (mode 2) settings are explained in detail. Making settings is done via the master outdoor unit Mode 1 Mode 1 can be used to monitor the current situation of the outdoor unit. Some field setting contents can be monitored as well. Below the settings in mode 1 are explained. [1-0] = shows whether the unit you check is a master, slave 1 or slave 2 unit No indication = undefined situation 0 = outdoor unit is master unit 1 = outdoor unit is slave 1 unit 2 = outdoor unit is slave 2 unit Master, slave 1 and slave 2 indications are relevant in multiple outdoor unit system configurations. The allocation of which outdoor unit is master, slave 1 or slave 2 are decided by the unit s logic. The master unit should be used to input field settings in mode 2. [1-1] = shows the status of low night noise operation 1 = unit is currently operating under low noise restrictions 0 = unit is currently not operating under low noise restrictions Low night noise operation reduces the sound generated by the unit compared to nominal operating conditions. Low night noise operation can be set in mode 2. There are two methods to activate low night noise operation of the outdoor unit system. The first method is to enable an automatic low night noise operation during night time by field setting.the unit will operate at the selected low noise level during the selected time frames. The second method is to enable low night noise operation based on an external input. For this operation an optional accessory is required. [1-2] = shows the status of power consumption limitation operation 1 = unit is currently operating under power consumption limitation 0 = unit is currently not operating under power consumption limitations Power consumption limitation reduces the power consumption of the unit compared to nominal operating conditions. Power consumption limitation can be set in mode 2. There are two methods to activate power consumption limitation of the outdoor unit system. The first method is to enable a forced power consumption limitation by field setting. The unit will always operate at the selected power consumption limitation. The second method is to enable power consumption limitation based on an external input. For this operation an optional accessory is required. 124 Field Settings

137 Field Setting from Outdoor Unit [1-5] = shows the current T target parameter position. [1-6] = shows the current T target parameter position [1-10] = shows the total number of connected indoor units It can be convenient to check if the total number of indoor units which are installed match the total number of indoor units which are recognized by the system. In case there is a mismatch, It is advised to check the communication wiring path between outdoor and indoor units (F1/F2 communication line). [1-13] = shows the total number of connected outdoor units (in case of multiple outdoor system). It can be convenient to check if the total number of outdoor units which are installed matches the total number of outdoor units which are recognized by the system. In case there is a mismatch, It is advised to check the communication wiring path between outdoor and outdoor units (Q1/Q2 communication line). [1-17] = shows the latest error code. [1-18] = shows the error code which occurred 1 time before current error code. [1-19] = shows the error code which occurred 2 time before current error code. When the latest error codes were reset by accident on an indoor unit user interface, they can be checked again through this monitoring settings. Detailed information about error codes can be consulted in the service manual of this unit. [1-40] = shows the current cooling comfort setting. [1-41] = shows the current heating comfort setting Mode 2 Mode 2 is used to change the field settings of the system. Consulting the current field setting value and changing the current field setting value is possible. In general, normal operation can be resumed without special intervention after changing field settings. Some field settings are used for special operation (e.g., 1 time operation, recovery/vacuuming setting, manual adding refrigerant setting, etc.). In such a case, it is required to abort the special operation before normal operation can restart. It will be indicated in below explanations. [2-8]: Te target temperature during cooling operation Value Te target [2-8] 0 (default) Auto 2 6 C (42.8 F) 3 7 C (44.6 F) 4 8 C (46.4 F) 5 9 C (48.2 F) 6 10 C (50 F) 7 11 C (51.8 F) [2-9]: Tc target temperature during heating operation Value [2-9] Tc target 0 (default) Auto 1 41 C (105.8 F) 3 43 C (109.4 F) 6 46 C (114.8 F) Field Settings 125

138 Field Setting from Outdoor Unit SiUS341504E [2-12]: Enable the low night noise function and/or power consumption limitation via external control adaptor (DTA104A61/62) If the system needs to be running under low night noise operation or under power consumption limitation conditions when an external signal is sent to the unit, this setting should be changed. This setting will only be effective when the optional external control adaptor (DTA104A61/62) is installed. Default value: 0 To activate this function: 1 [2-18]: Fan high static pressure setting In order to increase the static pressure the outdoor unit fan is delivering, this setting should be activated. For details about this setting, see technical specifications. Default value: 0 To activate this function: 1 [2-20]: Manual additional refrigerant charge In order to add the additional refrigerant charge amount in a manual way (without automatic refrigerant charging functionality), following setting should be applied. Refer to Method for Adding Refrigerant on P.138 for further instructions regarding the different ways to charge additional refrigerant. Default value: 0 To activate this function: 1 To stop the manual additional refrigerant charge operation (when the required additional refrigerant amount is charged), press BS3. If this function was not aborted by pressing BS3, the unit will stop its operation after 30 minutes. If 30 minutes was not sufficient to add the needed refrigerant amount, the function can be reactivated by changing the field setting again. [2-21]: Refrigerant recovery/vacuuming mode In order to achieve a free pathway to reclaim refrigerant out of the system or to remove residual substances or to vacuum the system it is necessary to apply a setting which will open required s in the refrigerant circuit so the reclaim of refrigerant or vacuuming process can be done properly. Default value: 0 To activate this function: 1 To stop the refrigerant recovery/vacuuming mode, press BS3. If BS3 is not pressed, the system will remain in refrigerant recovery/vacuuming mode. [2-22]: Automatic low night noise setting and level during night time By changing this setting, you activate the automatic low night noise operation function of the unit and define the level of operation. Depending on the chosen level, the noise level will be lowered (3: Level 3 < 2: Level 2 < 1: Level 1). The start and stop moments for this function are defined under setting [2-26] and [2-27]. Default value: 0 To activate this function: 1, 2, or Field Settings

139 Field Setting from Outdoor Unit [2-25]: Low night noise operation level via the external control adaptor If the system needs to be running under low night noise operation conditions when an external signal is sent to the unit, this setting defines the level of low night noise that will be applied (3: Level 3 < 2: Level 2 < 1: Level 1). This setting will only be effective when the optional external control adaptor (DTA104A61/62) is installed and the setting [2-12] was activated. Default value: 2 To activate this function: 1, 2, or 3 [2-26]: Low night noise operation start time Value [2-26] This setting is used in conjunction with setting [2-22]. [2-27]: Low night noise operation stop time Start time automatic low night noise operation (approximately) 1 20:00 2 (default) 22: :00 Value [2-27] Start time automatic low night noise operation (approximately) 1 6:00 2 7:00 3 (default) 8:00 This setting is used in conjunction with setting [2-22]. [2-30]: Power consumption limitation level (step 1) via the external control adaptor (DTA104A61/62) If the system needs to be running under power consumption limitation conditions when an external signal is sent to the unit, this setting defines the level power consumption limitation that will be applied for step 1. The level is according to the table. Value [2-30] Power consumption limitation (approximately) 1 60% 2 65% 3 (default) 70% 4 75% 5 80% 6 85% 7 90% 8 95% [2-31]: Power consumption limitation level (step 2) via the external control adaptor (DTA104A61/62) If the system needs to be running under power consumption limitation conditions when an external signal is sent to the unit, this setting defines the level power consumption limitation that will be applied for step 2. The level is according to the table. Value [2-31] Power consumption limitation (approximately) 1 (default) 40% 2 50% 3 55% Field Settings 127

140 Field Setting from Outdoor Unit SiUS341504E [2-32]: Forced, all time, power consumption limitation operation (no external control adaptor is required to perform power consumption limitation) If the system always needs to be running under power consumption limitation conditions, this setting activates and defines the level power consumption limitation that will be applied continuously. The level is according to the table. Value Restriction reference [2-32] 0 (default) Function not active 1 Follows [2-30] setting 2 Follows [2-31] setting [2-34]: Indoor unit fan tap setting Indoor units fan speed limitation related to connection capacity and outdoor air temperature for energy saving. Value [2-34] 0 (default) Indoor unit fan tap setting Fan speed is limited to L tap when indoor units capacity 130%. In heating mode, fan speed is limited to L tap when indoor units capacity 130%. Fan speed follows a setting of the remote controller (not limited by indoor units connection capacity). Fan speed is limited to L tap when outdoor air temperature goes down to below 29.5 C (85.1 F) and indoor condition A ( ). It returns to remote controller setting when outdoor air temperature goes up to over 32.5 C (90.5 F) or indoor condition B ( ). Fan speed is limited to L tap when outdoor air temperature goes down to below 23.5 C (74.3 F) and indoor condition A ( ). It returns to remote controller setting when outdoor air temperature goes up to over 26.5 C (79.7 F) or indoor condition B ( ). Fan speed is limited to L tap when outdoor air temperature goes down to below 19.3 C (66.7 F) and indoor condition A ( ). It returns to remote controller setting when outdoor air temperature goes up to over 22.3 C (72.1 F) or indoor condition B ( ). Fan speed is limited to L tap when outdoor air temperature goes down to below 29.5 C (85.1 F). It returns to remote controller setting when outdoor air temperature goes up to over 32.5 C (90.5 F). Fan speed is limited to L tap when outdoor air temperature goes down to below 23.5 C (74.3 F). It returns to remote controller setting when outdoor air temperature goes up to over 26.5 C (79.7 F). Fan speed is limited to L tap when outdoor air temperature goes down to below 19.3 C (66.7 F). It returns to remote controller setting when outdoor air temperature goes up to over 22.3 C (72.1 F). Indoor condition A: 1.7 C ( 3 F) < Indoor air temperature set temperature < 3 C (5.4 F) Indoor condition B: 1.7 C ( 3 F) Indoor air temperature set temperature, or 3 C (5.4 F) 128 Field Settings

141 Field Setting from Outdoor Unit [2-35]: Height difference setting Default value: 1 In case the outdoor unit is installed in the lowest position (indoor units are installed on a higher position than outdoor units) and the height difference between the highest indoor unit and the outdoor unit exceeds 40 m (131 ft), the setting [2-35] should be changed to 0. [2-45]: Technical cooling [2-45] Description 0 (default) No technical cooling available 1 Technical cooling available [2-47]: Te target temperature during heat recovery operation Value [2-47] Te target 0 (default) Auto 2 6 C (42.8 F) 3 7 C (44.6 F) 4 8 C (46.4 F) 5 9 C (48.2 F) 6 10 C (50 F) 7 11 C (51.8 F) [2-49]: Max. level difference setting In case the outdoor location is higher than indoor, extension is possible up till 90 m (295 ft), Refer to [2-49] for dedicated setting. Value [2-49] Max. level difference setting 0 (default) OFF 1 ON [2-81]: Cooling comfort setting Value Cooling comfort setting [2-81] 0 Eco 1 (default) Mild 2 Quick 3 Powerful This setting is used in conjunction with setting [2-8]. [2-82]: Heating comfort setting Value [2-82] Heating comfort setting 0 Eco 1 (default) Mild 2 Quick 3 Powerful This setting is used in conjunction with setting [2-9]. Field Settings 129

142 Field Setting from Outdoor Unit SiUS341504E 3.5 Cool / Heat Mode Changeover Set Cool/Heat Separately for Each Branch Selector Unit by Cool/Heat Selector. Set remote controller changeover switch (SS1, SS2) as following: When using COOL/HEAT selector, turn this switch to the BS side. 1 2 SS1 1 2 SS2 TE: This setting must be completed before turning power supply ON. When using cool/heat selector, connect to the terminal A, B and C on the EC of the electrical component box. EXAMPLE OF TRANSMISSION LINE CONNECTION Example of connecting transmission wiring. Connect the transmission wirings as shown in the figure below. In case of the indoor unit connect as the cooling only unit, it wire the terminal F1 F2 of the last Branch Selector unit. OUT/D.BS F1 F2 F1 F2 IN/D OUT/D.BS F1 F2 F1 F2 Final Branch Selector unit To the indoor unit where 1st unit Final unit the selection of heating and cooling is available. Cooling Only Outdoor unit TO IN/D UNIT TO OUT/D UNIT F1 F2 F1 F2 Branch wiring Use 2-core wires. (There is no polarity.) Cool/heat selector remote control wiring Use 3-core wires. (Keep in mind the polarity.) F1 F2 F1 F2 IN/D OUT/D.BS REMOTE CONTROLLER A B C F1 F2 F1 F2 IN/D OUT/D.BS REMOTE CONTROLLER A B C F1 F2 F1 F2 IN/D OUT/D.BS REMOTE CONTROLLER A B C Branch Selector unit A Branch Selector unit B Final Branch Selector unit F1 F2 F1 F2 F1 F2 COOL/HEAT selector F1 F2 COOL/HEAT selector F1 F2 COOL/HEAT F1 F2 selector Indoor unit for cooling 130 Field Settings

143 Field Setting from Outdoor Unit 3.6 Setting of Low Night Noise Operation and Demand Operation Setting of Low Night Noise Operation By connecting the external contact input to the low noise input of the outdoor unit external control adaptor (optional), you can lower operating noise. Level 1 Level 2 Level 3 Setting Content Set the outdoor unit fan to Step 6 or lower. Set the outdoor unit fan to Step 5 or lower. Set the outdoor unit fan to Step 4 or lower. A. When the low night noise operation is carried out by external contact (with the use of the external control adaptor for outdoor unit) 1. Connect external control adaptor for outdoor unit and short circuit terminal of low night noise operation. If carrying out demand or low noise input, connect the adaptor s terminals as shown below. External control adaptor for outdoor unit F1 F2 P3 P4 X X X X X X X X X X C Demand Low noise Host computer monitor panel or demand controller Outside wiring indicated by dotted line 2. While in "Setting mode 2", set the setting condition for set item No. 12 (Setting of external low noise/demand operation) to "". 3. If necessary, while in "Setting mode 2", select the setting condition (i.e., "Level 1", "Level 2", or "Level 3") for set item No. 25 (Setting of external low noise level). 4. If necessary, while in "Setting mode 2", set the setting condition for the set item No. 29 (Setting of capacity priority) to "ON". (If the condition is set to "ON", when the air conditioning load reaches a high level, the low night noise operation command will be ignored to put the system into normal operation mode.) B. When the low night noise operation is carried out automatically at night (The external control adaptor for outdoor unit is not required) 1. While in "Setting mode 2", select the setting condition (i.e., "Level 1", "Level 2", or "Level 3") for set item No. 22 (Setting of low night noise operation level). 2. If necessary, while in "Setting mode 2", select the setting condition (i.e., "20:00", "22:00", or "24:00") for set item No. 26 (Setting of start time of low night noise operation). (Use the start time as a guide since it is estimated according to outdoor temperatures.) 3. If necessary, while in "Setting mode 2", select the setting condition (i.e., "06:00", "07:00", or "08:00") for set item No. 27 (Setting of end time of low night noise operation). (Use the end time as a guide since it is estimated according to outdoor temperatures.) 4. If necessary, while in "Setting mode 2", set the setting condition for set item No. 29 (Setting of capacity priority) to "ON". (If the condition is set to "ON", when the air conditioning load reaches a high level, the system will be put into normal operation mode even during night-time.) Field Settings 131

144 Field Setting from Outdoor Unit SiUS341504E Image of operation in the case of A Operation sound Rated operation sound Operation sound of mode 1 Operation sound of mode 2 Operation sound of mode 3 Approx. 55 db (target) (The power consumption may be increased by about 10%) Approx. 50 db (target) (The power consumption may be increased by about 20%) Approx. 45 db (target) (The power consumption may be increased by about 30%) If capacity priority is set in "Capacity priority setting", the fan speed will be increased according to the load of air conditioning when load is heavier. Low noise mode instructing Operation sound level set with "External low noise operation setting" Operation sound during low noise mode is instructed can be set with "External low noise level setting" (Factory setting is "Mode 2".) Note 1: Above values are reference only (measured in silent room) Note 2: Above values are for 1 module only. Image of operation in the case of B Operation sound Rated operation sound Operation sound of mode 1 Operation sound of mode 2 Operation sound of mode 3 Time set with "Low night noise operation start setting" If capacity priority is set in "Capacity priority setting", the fan speed will be increased according to the load of air conditioning when load is heavier. Night-time Operation sound level set with "Low night noise operation setting" Time set with "Low night noise operation end setting" Operation sound during low night noise mode is instructed can be set with "Low night noise level setting". (Factory setting is "OFF".) PM 8:00 PM 10:00 PM 0:00 AM 6:00 AM 7:00AM 8:00 Set with "Low night noise operation start setting". (Factory setting is "PM 10:00".) Set with "Low night noise operation end setting". (Factory setting is "AM 8:00".) Image of operation in the case of A and B Operation sound Rated operation sound Operation sound of mode 1 Operation sound of mode 2 Operation sound of mode 3 Time set with "Low night noise operation start setting" Low noise mode instructing Operation sound set with "External low noise operation setting" If capacity priority is set in "Capacity priority setting", the fan speed will be increased according to the load of air conditioning when load is heavier. Night-time Low noise mode instructing Operation sound level set with "Low night noise Operation sound set with operation setting" "External low noise operation setting" PM 8:00 PM 10:00 PM 0:00 AM 6:00 AM 7:00AM 8:00 Set with "Low night noise operation start setting". (Factory setting is "PM 10:00".) Time set with "Low night noise operation end setting" Operation sound during low noise mode is instructed can be set with "External low noise level setting". (Factory setting is "Mode 2".) Set with "Low night noise operation end setting". (Factory setting is "AM 8:00".) Operation sound during low night noise mode is instructed can be set with "Low night noise level setting". (Factory setting is "OFF".) When external low noise instruction is received during the operation with low night noise mode, Mode 2 precedes Mode 1 and Mode 3 precedes Mode Field Settings

145 Field Setting from Outdoor Unit Setting of Demand Operation By connecting the external contact input to the demand input of the outdoor unit external control adaptor for outdoor unit (optional), the power consumption of unit operation can be saved suppressing the compressor operating condition. Setting item Demand 1 Description of setting Condition Level 1 Level 2 Level 3 Demand 2 Demand 3 Description Operate with power of approx. 60% or less of the rating. Operate with power of approx. 70% or less of the rating. Operate with power of approx. 80% or less of the rating. Operate with power of approx. 40% or less of the rating. Operate with forced thermostat OFF External control adaptor for outdoor unit Short circuit between "1" and "C" of the terminal block (TeS1). Short circuit between "2" and "C". Short circuit between "3" and "C" Setting procedure Outdoor unit PCB Set the setting item No. 32 to "Demand 1" and the setting item No. 30 to "Level 1". Set the setting item No. 32 to "Demand 1" and the setting item No. 30 to "Level 2". Set the setting item No. 32 to "Demand 1" and the setting item No. 30 to "Level 3". Set the setting item No. 32 to "Demand 2". : However the demand operation does not occur in the following operation modes. (1) Startup control (2) Oil return operation (3) Defrosting operation (4) Pump down residual operation If carrying out demand or low noise input, connect the adaptor s terminals as shown below. External control adaptor for outdoor unit F1 F2 P3 P4 X X X X X X X X X X C Demand Low noise Host computer monitor panel or demand controller Outside wiring indicated by dotted line A. When the demand operation is carried out by external contact (with the use of the external control adaptor for outdoor unit). 1. Connect external control adaptor for outdoor unit and short circuit terminals as required (Refer above figure). 2. While in "Setting mode 2", set the setting condition for set item No. 12 (Setting of external low noise/demand operation) to "". 3. If necessary, while in "Setting mode 2", select the set item No. 30 (Setting of Demand 1 level) and then set the setting condition to targeted mode. Field Settings 133

146 Field Setting from Outdoor Unit SiUS341504E B. When the Normal demand operation is carried out. (Use of the external control adaptor for outdoor unit is not required.) 1. While in "Setting mode 2", make setting of the set item No. 32 (Setting of alternate demand) to "ON". 2. While in "Setting mode 2", select the set item No. 30 (Setting of Demand 1 level) and then set the setting condition to targeted mode. If carrying out demand or low-noise input, connect the terminals of the external control adaptor for outdoor unit as shown below. F1 F2 N P X1M C Low Demand noise To other external control adaptor for outdoor unit Outside wiring indicated by dotted line. Host computer monitor panel or demand controller Image of operation in the case of A Power consumption Rated power consumption 80 % of rated power consumption 70 % of rated power consumption 60 % of rated power consumption 40 % of rated power consumption Forced thermostat OFF (Fan operation) Demand level 1 instructing Demand level 2 instructing Demand level 3 instructing Power consumption set by "Demand 1 level setting". The power consumption during the demand level 1 instructing can be set with the "Demand 1 level setting". ("70 % of rated power consumption" has been set at factory.) Image of operation in the case of B Power consumption Rated power consumption 80 % of rated power consumption 70 % of rated power consumption 60 % of rated power consumption The power consumption set with "Demand 1 level setting". When the "Normal demand setting" is set to ON ("OFF" has been set at factory.), the power consumption can be set with the "Demand 1 level setting". ("70 % of rated power consumption" has been set at factory.) 134 Field Settings

147 Field Setting from Outdoor Unit Image of operation in the case of A and B Power consumption Rated power consumption 80 % of rated power consumption 70 % of rated power consumption 60 % of rated power consumption 40 % of rated power consumption Forced thermostat OFF (Fan operation) The power consumption set with "Demand 1 level setting". Demand level 2 instructing Demand level 3 instructing The power consumption can be set with the "Demand 1 level setting". ("70 % of rated power consumption" has been set at factory.) During continuous demand operation, when the external demand instruction is received repeatedly, the instruction with higher demand level has the precedence. Detailed Setting Procedure of Low Night Noise Operation and Demand Control 1. Setting mode 1 (H1P OFF) In setting mode 2, press the BS1 (MODE button) once Setting mode 1 is entered and H1P turns OFF. During the setting mode 1 is displayed, In low night noise operation and In demand control are displayed. 2. Setting mode 2 (H1P ON) (1) In setting 1, press and hold the BS1 (MODE button) for more than 5 seconds. Setting mode 2 is entered and H1P lights. (2) Press the BS2 (SET button) several times and match the LED display with the Setting No. you want. (3) Press the BS3 (RETURN button) once, and the present setting content is displayed. Press the BS2 (SET button) several times and match the LED display with the setting content you want. (4) Press the BS3 (RETURN button) two times. Returns to (1). (5) Press the BS1 (MODE button) once Returns to the setting mode 1 and H1P turns OFF. Field Settings 135

148 Charging Refrigerant SiUS341504E 4. Charging Refrigerant 4.1 Precautions TE Refrigerant cannot be charged until field wiring has been completed. Refrigerant may only be charged after performing the leak test and the vacuum drying. When charging a system, care shall be taken that its maximum permissible charge is never exceeded, in view of the danger of liquid hammer. Charging with an unsuitable substance may cause explosions and accidents, so always ensure that the appropriate refrigerant R-410A is charged. Refrigerant containers shall be opened slowly. Always use protective gloves and protect your eyes when charging refrigerant. When the refrigerant system is to be opened, refrigerant must be treated according to the applicable legislation. DANGER: Electrical shock To avoid compressor breakdown. Do not charge the refrigerant more than the specified amount. This outdoor unit is factory charged with refrigerant and depending on pipe sizes and pipe lengths some systems require additional charging of refrigerant. In case re-charge is required, refer to the nameplate of the unit. It states the type of refrigerant and necessary amount. 4.2 Calculating the Additional Refrigerant Charge How to calculate the additional refrigerant to be charged Additional refrigerant to be charged = R (lbs.). R should be rounded off in units of 0.1 lbs. R = [(X 1 φ7/8) (X 2 φ3/4) (X 3 φ5/8) (X 4 φ1/2) (X 5 φ3/8) (X 6 φ1/4) 0.015] [A] + [B] + [C] X = Total length (ft. (m)) of liquid piping size at φa In units of 0.1 kg, additional refrigerant to be charged = R (kg). R = [(X 1 φ22.2) (X 2 φ19.1) (X 3 φ15.9) (X 4 φ12.7) (X 5 φ9.5) (X 6 φ6.4) 0.022] [A] + [B] + [C] Parameter [A] Refrigerant amount for Branch Selector units Branch Selector unit model Refrigerant amount BS4Q54T 0.7 lbs./unit (0.3 kg/unit) BS6Q54T 0.9 lbs./unit (0.4 kg/unit) BS8Q54T 1.1 lbs./unit (0.5 kg/unit) BS10Q54T 1.5 lbs./unit (0.7 kg/unit) BS12Q54T 1.8 lbs./unit (0.8 kg/unit) BSQ36T 0.1 lbs./unit (0.05 kg/unit) BSQ60T 0.2 lbs./unit (0.1 kg/unit) BSQ96T 0.4 lbs./unit (0.2 kg/unit) 136 Field Settings

149 Charging Refrigerant INFORMATION Piping length is considered the distance from the outdoor unit to the farthest indoor unit. When using more than one multi branch selector unit, add the sum of the individual BS unit charge factors. In case of a multi-outdoor-unit system, add the sum of the individual outdoor unit charge factors. Parameter [B] Refrigerant amount for outdoor units Outdoor unit capacity type Refrigerant amount REYQ72T 0.0 lbs./unit (0.0 kg/unit) REYQ96T 3.1 lbs./unit (1.4 kg/unit) REYQ120T 3.3 lbs./unit (1.5 kg/unit) REYQ144T 10.6 lbs./unit (4.8 kg/unit) REYQ168T 10.8 lbs./unit (4.9 kg/unit) Field piping length < ft. (90 m) ft. (90 m) Total indoor unit capacity connection ratio Parameter [C] Refrigerant amount by field piping length and indoor units capacity Refrigerant amount Total outdoor unit capacity type REYQ72-144T REYQ T REYQ T 85% 0.0 > 85% The smaller of [D] or 5.51 lbs. (2.5 kg) The smaller of [D] or 6.61 lbs. (3.0 kg) 85% 0.0 > 85% 2.20 lbs. (1.0 kg) The smaller of [D] or 7.50 lbs. (3.4 kg) Field Settings 137

150 Charging Refrigerant SiUS341504E 4.3 Method for Adding Refrigerant Flow Chart For more information, see Charging Method on P.140. Pre-charging refrigerant Step 1 Calculate additional refrigerant charge amount: R (kg) p< p> C D A B Step 2+3 Close s C, D and A Open B to the liquid line Execute pre-charging amount: Q (kg) Disconnect the manifold from the suction gas line and the high pressure/low pressure gas line N2 R-410A Step 4a R=Q Close B Charging is finished Fill in the amount on the additional refrigerant charge label Go to test run R<Q Refrigerant overcharge happened, recover refrigerant to reach R=Q Charging refrigerant R>Q Step 4b Close B Disconnect the manifold from the liquid line R>Q Step 5 (Refer as left figure) Connect A to the suction gas stop service port. Open all outdoor unit stop s Step 5 ~ End p< p> A R-410A Step 6 Manual charge Activate field setting [2-20] = 1 Unit will start manual refrigerant charging operation. Open A Charge remaining amount of refrigerant P (kg) R = Q + P Close A Press BS3 to stop manual charging Charging is finished Fill in the amount on the additional refrigerant charge label Go to test run See figure Location of s on P.140 for more information refer to the text in this chapter. Be sure to charge the specified amount of refrigerant in liquid state. Since this refrigerant is a mixed refrigerant, adding it in gas form may cause the refrigerant composition to change, preventing normal operation. Before charging, check whether the refrigerant cylinder is equipped with a siphon tube or not. Charge the liquid refrigerant with the cylinder in upright position. Charge the liquid refrigerant with the cylinder in upside-down position. Be sure to use tools exclusively for R-410A to ensure required pressure resistance and to prevent foreign materials from mixing into the system. 138 Field Settings

151 Charging Refrigerant TE Charging with an unsuitable substance may cause explosions and accidents, so always make sure that the appropriate refrigerant (R-410A) in charged. Refrigerant containers must be opened slowly. CAUTION When charging a system, charging over the permissible quantity can cause liquid hammer. Always use protective gloves and protect your eyes when charging refrigerant. When the refrigerant charging procedure is done or when pausing, close the of the refrigerant tank immediately. If the tank is left with the open, the amount of refrigerant which is properly charged may get off point. More refrigerant may be charged by any remaining pressure after the unit has stopped. TE If the power of some units is turned OFF, the charging procedure cannot be finished properly. In case of a multiple outdoor system, turn on the power of all outdoor units. Make sure to turn ON the power 6 hours before starting the operation. This is necessary to warm the crankcase by the electric heater. If operation is performed within 12 minutes after the indoor and outdoor units are turned on, the compressor will not operate before the communication is established in a correct way between outdoor unit(s) and indoor units. Before starting charging procedures, check if the segment display indication of the outdoor unit A1P PCB is as normal (see "Functions of the BS button which are located on the outdoor unit PCB (A1P)". Make sure all connected indoor units are recognised Close the front panel before any refrigerant charge operation is executed. Without the front panel attached the unit cannot judge correctly whether it is operating properly or not. TE In case of maintenance and the system (outdoor unit+field piping+indoor units) does not contain any refrigerant any more (e.g., after refrigerant reclaim operation), the unit has to be charged with its original amount of refrigerant (refer to the nameplate on the unit) by pre-charging before the automatic charging function can be started. Field Settings 139

152 Charging Refrigerant SiUS341504E Charging Method As explained during vacuum drying method, once vacuum drying is finished, additional refrigerant charging can start. Adding refrigerant by using the manual refrigerant charging function. See "Adding refrigerant by using the manual charging function". This method uses a manual method for charging refrigerant. A flow chart is available which gives an overview of the possibilities and actions to be taken (see "Flow Chart" on P.138). To speed up the process of pre-charging refrigerant for large systems, it is recommended to first charge a portion of the refrigerant before performing charging. This step is included in below procedure. This step can be skipped, charging will take longer in such a case. Follow the steps as described below and take into account whether you want to use the automatic charge function or not. 1 Calculate the additional amount of refrigerant to be added using the formula mentioned in "Calculating the Additional Refrigerant Charge" on P The first 10 kg (22 lbs) of additional refrigerant can be charged without outdoor unit operation. If the additional refrigerant amount is smaller than 10 kg (22 lbs), perform the pre-charging procedure as explained in step 3 and 4a below. If the additional refrigerant charge is larger than 10 kg (22 lbs), perform step 3 till the end of the procedure. 3 Pre-charging can be done without compressor running by connecting the refrigerant bottle to the liquid stop service port (open B). Make sure that all outdoor unit stop, as well as A,C,D are closed a A d p< p> B h g f C D N2 R-410A b c a b c d e f g h A B C D e Pressure reducing Nitrogen Weighing scales Refrigerant R-410A tank (siphon system) Vacuum pump Liquid line stop Gas line stop High pressure/low pressure gas line stop Valve A Valve B Valve C Valve D 4 Do one of the following: 4a 4b If The calculated additional refrigerant amount is reached by above pre-charging procedure The total amount of refrigerant could not be charged by pre-charging Then Close B and disconnect the manifold from the liquid line. Close B, disconnect the manifold from the liquid line, and perform steps 5~ Field Settings

153 Charging Refrigerant INFORMATION If the total additional refrigerant amount was reached in step 4 (by precharging only), record the amount of refrigerant that was added on the additional refrigerant charge label provided with the unit and attach it on the back side of the front panel. Perform the test procedure as described in "Test Operation" on P After pre-charging, perform the refrigerant charge operation as shown below and connect A to the gas line stop service port and charge the remaining additional refrigerant through this port open all outdoor unit stop s. At this point, A must remain closed. A p< p> R-410A INFORMATION For a multi outdoor unit system, it is not required to connect all charge ports to a refrigerant tank. The refrigerant will be charged with ± 22 kg (48.5 lbs) in 1 hour time at an outdoor temperature of 30 C DB (86 FDB) or with ± 6 kg (13.2 lbs) at an outdoor temperature of 0 C DB (32 FDB). If you need to speed up in case of a multiple outdoor system, connect the refrigerant tanks to each outdoor unit. TE The unit's internal piping is already factory charged with refrigerant, so be careful when connecting the charge hose. After adding the refrigerant, do not forget to close the lid of the refrigerant charging port. The tightening torque for the lid is 11.5 ~ 13.9 N m (8.5 ~ 10.3 ft lbf). In order to ensure uniform refrigerant distribution, it may take the compressor ±10 minutes to start up after the unit has started operation. This is not an error. Adding refrigerant by using the manual charging function 6 The remaining additional refrigerant charge can be charged by operating the outdoor unit by means of the manual refrigerant charge operation mode: Turn on the power of the indoor units and outdoor unit. Take all the precautions mentioned in "start-up and configuration" into account. Activate outdoor unit setting [2-20] = 1 to start manual refrigerant charge mode. Result: The unit will start operation. Valve A can be opened. Charging of remaining additional refrigerant can be done. When the remaining calculated additional refrigerant amount is added, close A and press BS3 to stop the manual refrigerant charging procedure. Field Settings 141

154 Charging Refrigerant SiUS341504E INFORMATION The manual refrigerant charge operation will automatically stop within 30 minutes. If charging is not completed after 30 minutes, perform the additional refrigerant charging operation again. When an error is detected during the procedure (e.g., in case of closed stop ), an error code will be displayed. In that case, refer to "Error code list" on P.152 and solve the error accordingly. Resetting the error can be done by pushing BS3. The procedure can be restarted from 6B). Aborting the manual refrigerant charge is possible by pressing BS3. The unit will stop and return to idle condition Checks after Adding Refrigerant Are the stop s for liquid and gas open? Is the amount of refrigerant, that has been added, recorded on the refrigerant charge label? TE Make sure to open all stop s after (pre-) charging the refrigerant. Operating with the stop s closed will damage the compressor. 142 Field Settings

155 Part 6 Service Diagnosis 1. Symptom-based Troubleshooting Troubleshooting by Remote Controller Mode Access Operation Procedure of Self-diagnosis by Remote Controller Error Code and Description Error Codes - Sub Codes Troubleshooting by Indication on the Remote Controller External Protection Device Abnormality PCB Abnormality Drain Level Control System (S1L) Abnormality Fan Motor (M1F) Lock, Overload Indoor Unit Fan Motor Abnormality Indoor Unit Fan Motor Abnormality Overload / Overcurrent / Lock of Indoor Unit Fan Motor Swing Flap Motor (M1S) Abnormality Power Supply Voltage Abnormality Coil Abnormality / Dust Clogging Coil Abnormality Drain Level above Limit Capacity Determination Device Abnormality Transmission Abnormality between Indoor Unit PCB and Fan PCB Thermistor Abnormality Combination Error between Indoor Unit PCB and Fan PCB Remote Sensor Abnormality Thermistor Abnormality Humidity Sensor System Abnormality Room Temperature Thermistor in Remote Controller Abnormality PCB Abnormality Actuation of High Pressure Switch Actuation of Low Pressure Sensor INV Compressor Motor Lock Compressor Damage Alarm Outdoor Unit Fan Motor Abnormality Coil Abnormality Discharge Pipe Temperature Abnormality Wet Alarm Refrigerant Overcharged Harness Abnormality (between Control PCB and Inverter PCB) Outdoor Unit Fan Motor Signal Abnormality Thermistor Abnormality High Pressure Sensor Abnormality Service Diagnosis 143

156 3.35 Low Pressure Sensor Abnormality Inverter PCB Abnormality Reactor Temperature Rise Abnormality Inverter Radiation Fin Temperature Rise Abnormality INV Compressor Instantaneous Overcurrent INV Compressor Overcurrent INV Compressor Startup Abnormality Transmission Error between Inverter and Control PCB Power Supply Voltage Imbalance Reactor Temperature Abnormality Inverter Radiation Fin Temperature Abnormality Field Setting after Replacing Outdoor Unit Main PCB Abnormality or Combination of PCB Abnormality Refrigerant Shortage Reverse Phase, Open Phase Power Supply Insufficient or Instantaneous Abnormality Check Operation is not Executed Transmission Error between Indoor Units and Outdoor Units Transmission Error between Remote Controller and Indoor Unit Transmission Error between Outdoor Units Transmission Error between Main and Sub Remote Controllers Transmission Error between Indoor and Outdoor Units in the Same System Improper Combination of Indoor and Outdoor Units, Indoor Units and Remote Controller Address Duplication of Centralized Control Equipment Transmission Error between Centralized Control Equipment and Indoor Unit System is not Set yet System Abnormality, Refrigerant System Address Undefined Check Service Diagnosis

157 1. Symptom-based Troubleshooting Symptom-based Troubleshooting No. Symptom Supposed Cause Countermeasure 1 The system does not start operation at all. Blowout of fuse(s) Turn OFF the power supply and then replace the fuse(s). Cutout of breaker(s) If the knob of any breaker is in its ON OFF position, turn ON the power Knob supply. Tripped If the knob of any circuit breaker is in its tripped position, do not OFF turn ON the power supply. Circuit breaker Power failure After the power failure is reset, restart the system. 2 The system starts operation but makes an immediate stop. Blocked air inlet or outlet of indoor or outdoor unit Clogged air filter(s) 3 The system does not cool or heat air well. Blocked air inlet or outlet of indoor or outdoor unit Clogged air filter(s) Enclosed outdoor unit(s) Improper set temperature 4 The system does not operate. 5 The system makes intermittent stops. 6 COOL-HEAT selection is disabled. The system stops and immediately restarts operation. Pressing the TEMP ADJUST button immediately resets the system. The remote controller displays "UNDER CENTRALIZED CONTROL", which blinks for a period of several seconds when the OPERATION button is depressed. The system stops immediately after turning ON the power supply. The remote controller displays error codes "U4" and "U5", and the system stops but restarts after a lapse of several minutes. The remote controller displays "UNDER CENTRALIZED CONTROL". The remote controller displays "UNDER CENTRALIZED CONTROL", and the COOL- HEAT selection remote controller is provided. Airflow rate set to "LOW" Improper direction of air diffusion Open window(s) or door(s) [In cooling] Direct sunlight received [In cooling] Too many persons staying in a room [In cooling] Too many heat sources (e.g. OA equipment) located in a room If the OPERATION lamp on the remote controller turns ON, the system will be normal. These symptoms indicate that the system is controlled so as not to put unreasonable loads on the system. The system is controlled with centralized control equipment. Blinking display indicates that the system cannot be operated using the remote controller. The system is in preparation mode of micro-computer operation. The system stops due to an interruption in communication between units caused by electrical noises coming from equipment other than air conditioners. This remote controller has no option to select cooling operation. COOL-HEAT selection is made using the COOL-HEAT selection remote controller. Remove obstacle(s). Clean the air filter(s). Remove obstacle(s). Clean the air filter(s). Remove the enclosure. Set the temperature to a proper degree. Set it to a proper airflow rate. Set it to a proper direction. Shut it tightly. Hang curtains or shades on windows. The model must be selected to match the air conditioning load. Normal operation. The system will automatically start operation after a lapse of 5 minutes. Operate the system using the COOL/HEAT central remote controller. Wait for a period of approximately 1 minute. Remove causes of electrical noises. If these causes are removed, the system will automatically restart operation. Use a remote controller with option to select cooling operation. Use the COOL-HEAT selection remote controller to select cool or heat. Service Diagnosis 145

158 Symptom-based Troubleshooting SiUS341504E No. Symptom Supposed Cause Countermeasure 7 The system conducts fan operation but not cooling operation or heating operation. 8 The airflow rate is not reproduced according to the setting. 9 The airflow direction is not reproduced according to the setting. 10 A white mist comes out from the system. This symptom occurs immediately after turning ON the power supply. Even pressing the AIRFLOW RATE SET button makes no changes in the airflow rate. The airflow direction is not corresponding to that displayed on the remote controller. The flap does not swing. <Indoor unit> In cooling, the ambient humidity is high. (This indoor unit is installed in a place with much oil or dust.) <Indoor unit> Immediately after cooling operation stopping, the outdoor air temperature and ambient humidity are low. <Indoor and outdoor units> After the completion of defrosting operation, the system is switched to heating operation. The system is in preparation mode of operation. In heating operation, when the room temperature reaches the set degree, the outdoor unit will stop while the indoor unit is brought to fan LL operation so that no one gets cold air. Furthermore, if fan operation mode is selected when other indoor unit is in heating operation, the system will be brought to fan LL operation. (The fan LL operation is also enabled while in oil return mode in cooling operation.) Automatic control Uneven temperature distribution due to heavy stain of the inside of the indoor unit. Hot gas (refrigerant) flown in the indoor unit results to be vapor from the unit. Defrosted moisture turns to be vapor and comes out from the units. Wait for a period of approximately 10 minutes. Normal operation. Normal operation. Clean the inside of the indoor unit. Normal operation. Normal operation. 146 Service Diagnosis

159 Symptom-based Troubleshooting No. Symptom Supposed Cause Countermeasure 11 The system produces sounds. 12 Dust comes out from the system. 13 Odors come out from the system. 14 Outdoor unit fan does not rotate. 15 LCD display "88" appears on the remote controller. 16 The outdoor unit compressor or the outdoor unit fan does not stop. 17 The outdoor gets hot. 18 Hot air comes out from the system even though it stops. 19 The system does not cool air well. <Indoor unit> Immediately after turning ON the power supply, indoor unit produces "ringing" sounds. <Indoor and outdoor units> "Hissing" sounds are continuously produced while in cooling or defrosting operation. <Indoor and outdoor units> "Hissing" sounds are produced immediately after the startup or stop of the system, or the startup or stop of defrosting operation. <Indoor unit> Faint sounds are continuously produced while in cooling operation or after stopping the operation. <Indoor unit> "Creaking" sounds are produced while in heating operation or after stopping the operation. <Indoor unit> Sounds like "trickling" or the like are produced from indoor units in the stopped state. <Outdoor unit> Pitch of operating sounds changes. Dust comes out from the system when it restarts after the stop for an extended period of time. In operation In operation Immediately after turning ON the power supply After stopping operation While stopping operation Hot air is felt while the system stops. The system is in dry operation. These are operating sounds of the electronic expansion of the indoor unit. These sounds are produced from gas (refrigerant) flowing respectively through the indoor and outdoor units. These sounds are produced when the gas (refrigerant) stops or changes flowing. These sounds are produced from the drain discharge device in operation. These sounds are produced from resin parts expanding and contracting with temperature changes. On VRV systems, these sounds are produced when other indoor units in operation. The reason is that the system runs in order to prevent oil or refrigerant from dwelling. The reason is that the compressor changes the operating frequency. Dust, which has deposited on the inside of indoor unit, is blown out from the system. Odors of room, cigarettes or else adsorbed to the inside of indoor unit are blown out. The reason is that fan revolutions are controlled to put the operation to the optimum state. The reason is that the system is checking to be sure the remote controller is normal. It stops in order to prevent oil or refrigerant from dwelling. The reason is that the compressor is warmed up to provide smooth startup of the system. On VRV systems, small quantity of refrigerant is fed to indoor units in the stopped state when other indoor units are in operation. The reason is that the dry operation serves not to reduce the room temperature where possible. Normal operation. This sound becomes low after a lapse of approximately 1 minute. Normal operation. Normal operation. Normal operation. Normal operation. Normal operation. Normal operation. Normal operation. The inside of the indoor unit should be cleaned. Normal operation. Normal operation. This code is displayed for a period of approximately 1 minute at maximum. Normal operation. It stops after a lapse of approximately 5 to 10 minutes. Normal operation. Normal operation. Change the system to cooling operation. Service Diagnosis 147

160 Troubleshooting by Remote Controller 2. Troubleshooting by Remote Controller 2.1 Mode Access Operation BRC1E73 <Basic Screen> Operation mode changeover Fan speed control Menu display Confirmation of each setting On Off Cancel Operation lamp Main Menu Airflow Direction Individual Airflow Direction Ventilation Schedule Off Timer Celsius / Fahrenheit Main Menu screen Press "Menu/OK" button once. Setting Press "Cancel" button once. 1/3 <Main Menu> Airflow Direction Individual Airflow Direction Ventilation Schedule Off Timer Celsius / Fahrenheit Auto Clean Maintenance Information Configuration Current Settings Clock & Calendar Daylight Saving Time Language SiUS341504E Press "Cancel" button for 4 seconds or more. Basic screen Press "Cancel" button once. Press "Cancel" button once. Press "Cancel" button for 4 seconds or more. Service Settings screen <Service Settings> Test Operation Maintenance Contact Field Settings Energy Saving Options Prohibit Function Min Setpoints Differential Group Address Indoor unit AirNet Address Outdoor unit AirNet Address Error History Indoor Unit Status Outdoor Unit Status Forced Fan ON Switch Main Sub Controller Indicator Test Auto Clean Brush / Ind. Disable Auto Clean Maintenance Menu screen <Maintenance Menu> Model Name Operation Hours Indoor Unit Status Outdoor Unit Status Forced Defrost Error Display Swap Unit No. Addressed Sensor Value 148 Service Diagnosis