TECHNICAL & SERVICE MANUAL INDOOR UNIT : MPAF90MRI MPAF0MRI MPAF80RI MPAF0RI DC INVERTER MULTISYSTEM AIR CONDITIONER Capacity Indoor Model No..6 kw.0 kw. kw 7.0 kw MPAF90MRI MPAF0MRI MPAF80RI MPAF0RI Wall Mounted Indoor Unit MPAF90MRI MPAF0MRI MPAF80RI MPAF0RI RoHS This product does not contain any hazardous substances prohibited by the RoHS Directive. WARNING You are requested to use RoHS compliant parts for maintenance or repair. You are requested to use leadfree solder. FGAS REGULATION (EC) No 8 / 006 Do not vent R0A into atmosphere : R0A is a fluorinated greenhouse gas, covered by Kyoto Protocol, with a Global Warming Potential (GWP) = 97.
Important! Please Read Before Starting This air conditioning system meets strict safety and operating standards. As the installer or service person, it is an important part of your job to install or service the system so it operates safely and efficiently. For safe installation and troublefree operation, you must: Carefully read this instruction booklet before beginning. Follow each installation or repair step exactly as shown. Observe all local, state, and national electrical codes. Pay close attention to all warning and caution notices given in this manual. This symbol refers to a hazard or unsafe practice which can WARNING result in severe personal injury or death. This symbol refers to a hazard or unsafe practice which can CAUTION result in personal injury or product or property damage. If Necessary, Get Help These instructions are all you need for most installation sites and maintenance conditions. If you require help for a special problem, contact our sales/service outlet or your certified dealer for additional instructions. In Case of Improper Installation The manufacturer shall in no way be responsible for improper installation or maintenance service, including failure to follow the instructions in this document. SPECIAL PRECAUTIONS WARNING When Wiring ELECTRICAL SHOCK CAN CAUSE SEVERE PERSONAL INJURY OR DEATH. ONLY A QUALIFIED, EXPERIENCED ELECTRICIAN SHOULD ATTEMPT TO WIRE THIS SYSTEM. Do not supply power to the unit until all wiring and tubing are completed or reconnected and checked. Highly dangerous electrical voltages are used in this system. Carefully refer to the wiring diagram and these instructions when wiring. Improper connections and inadequate grounding can cause accidental injury or death. Ground the unit following local electrical codes. Connect all wiring tightly. Loose wiring may cause overheating at connection points and a possible fire hazard. Install a protective leakage breaker depending on the installation location (especially a damp or humid location). If a leakage breaker is not installed, electric shock can occur. When Transporting Be careful when picking up and moving the indoor and outdoor units. Get a partner to help, and bend your knees when lifting to reduce strain on your back. Sharp edges or thin aluminum fins on the air conditioner can cut your fingers. When Installing In a Ceiling or Wall Make sure the ceiling/wall is strong enough to hold the unit s weight. It may be necessary to construct a strong wood or metal frame to provide added support. In a Room Properly insulate any tubing run inside a room to prevent "sweating" that can cause dripping and water damage to walls and floors. In Moist or Uneven Locations Use a raised concrete pad or concrete blocks to provide a solid, level foundation for the outdoor unit. This prevents water damage and abnormal vibration. In an Area with High Winds Securely anchor the outdoor unit down with bolts and a metal frame. Provide a suitable air baffle. In a Snowy Area (for Heat Pumptype Systems) Install the outdoor unit on a raised platform that is higher than drifting snow. Provide snow vents. When Connecting Refrigerant Tubing Use the flare method for connecting tubing. Apply refrigerant lubricant to the matching surfaces of the flare and union tubes before connecting them, then tighten the nut with a torque wrench for a leakfree connection. Check carefully for leaks before starting the test run. When Servicing Turn the power off at the main power box (mains) before opening the unit to check or repair electrical parts and wiring. Keep your fingers and clothing away from any moving parts. Clean up the site after you finish, remembering to check that no metal scraps or bits of wiring have been left inside the unit being serviced. Others CAUTION Ventilate any enclosed areas when installing or testing the refrigeration system. Escaped refrigerant gas, on contact with fire or heat, can produce dangerously toxic gas. Confirm upon completing installation that no refrigerant gas is leaking. If escaped gas comes in contact with a stove, gas water heater, electric room heater or other heat source, it can produce dangerously toxic gas.
Table of Contents Page APPLICABLE MULTIOUTDOOR UNITS.... OPERATING RANGE.... SPECIFICATIONS. Unit Specifications.... Major Component Specifications.... Other Component Specifications... 6 6. DIMENSIONAL DATA... 7. REFRIGERANT FLOW DIAGRAM. Refrigerant Flow Diagram... 9. PERFORMANCE DATA. Air Throw Distance Charts... 0 6. ELECTRICAL DATA 6. Electric Wiring Diagrams... 7. FUNCTIONS 7. Operation Functions 7. Protective Functions...... 8. TROUBLESHOOTING 8. Precautions before Performing Inspection or Repair... 8. Method of SelfDiagnostics... 8. Checking the Indoor and Outdoor Units... 8. Trouble Diagnosis of Fan Motor... 8. Noise Malfunction and Electromagnetic Interference... 7 9 0 0
. OPERATING RANGE Temperature Indoor Air Intake Temp. Outdoor Air Intake Temp. Cooling Maximum Minimum C D.B. / C W.B. 9 C D.B. / C W.B. C D.B. C D.B. (*) Heating Maximum Minimum 7 C D.B. 6 C D.B. C D.B. / 8 C W.B. D.B. / C W.B. (*) 0 C D.B. : When combined with MPAF80RIMPAF0RI
Indoor Unit MPAF90MRI Power Source Voltage Rating Wall Mounted Indoor Unit 0 to 0V SinglePhase 0Hz 0V Performance Capacity Air Circulation (High) Moisture Removal (High) kw BTU/h m /h Liters/h Cooling.6 9,000 60.6 Heating.6,00 80 Electrical Rating Available Voltage Range Running Amperes Power Input V A W Cooling 0. 98 to 6 Heating 0. Features Controls / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) Air Filter Refrigerant Operation Sound Indoor : Hi/Me/Lo/Qt* (*Qt = Quiet mode) Refrigerant Tubing Connections Refrigerant Narrow tube Tube Diameter Wide tube Refrigerant Tube Kit / Accessories Indoor Horizontal Vertical dba (in.) (in.) Microprocessor / I.C. Thermister Wireless Remote Control Unit Hour ON or OFF Timer, Hour OFF Timer Auto and steps Manual Auto Washable, AntiMold R0A / / 8 / / / 8 / Flare 6. (/) 9. (/8) Optional / Air Clean Filter Dimensions & Weight Unit Dimensions Package Dimensions Weight Shipping Volume Height Width Depth Height Width Depth Net Shipping kg kg m Indoor Unit 8 8 70 900 0 0.0.0 0.08 DATA SUBJECT TO CHANGE WITHOUT NOTICE. 7
Indoor Unit MPAF0MRI Power Source Voltage Rating Wall Mounted Indoor Unit 0 to 0V SinglePhase 0Hz 0V Performance Capacity Air Circulation (High) Moisture Removal (High) kw BTU/h m /h Liters/h Cooling.,900 80.0 Heating.,00 00 Electrical Rating Available Voltage Range Running Amperes Power Input V A W Cooling 0. 98 to 6 Heating 0. Features Controls / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) Air Filter Refrigerant Operation Sound Indoor : Hi/Me/Lo/Qt* (*Qt = Quiet mode) Refrigerant Tubing Connections Refrigerant Narrow tube Tube Diameter Wide tube Refrigerant Tube Kit / Accessories Indoor Horizontal Vertical dba (in.) (in.) Microprocessor / I.C. Thermister Wireless Remote Control Unit Hour ON or OFF Timer, Hour OFF Timer Auto and steps Manual Auto Washable, AntiMold R0A 6 / / 9 / / / 9 / Flare 6. (/) 9. (/8) Optional / Air Clean Filter Dimensions & Weight Unit Dimensions Package Dimensions Weight Shipping Volume Height Width Depth Height Width Depth Net Shipping kg kg m Indoor Unit 8 8 70 900 0 0.0.0 0.08 DATA SUBJECT TO CHANGE WITHOUT NOTICE. 8
Indoor Unit MPAF80RI Power Source Voltage Rating Wall Mounted Indoor Unit 0 to 0V SinglePhase 0Hz 0V Performance Capacity Air Circulation (High) Moisture Removal (High) kw BTU/h m /h Liters/h Cooling. 7,600 80. Heating 6.0 0,00 880 Electrical Rating Available Voltage Range Running Amperes Power Input V A W Cooling 0.9 98 to 6 Heating 0.9 Features Controls / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) Air Filter Refrigerant Operation Sound Indoor : Hi/Me/Lo/Qt* (*Qt = Quiet mode) Refrigerant Tubing Connections Refrigerant Narrow tube Tube Diameter Wide tube Refrigerant Tube Kit / Accessories Indoor Horizontal Vertical dba (in.) (in.) Microprocessor / I.C. Thermister Wireless Remote Control Unit Hour ON or OFF Timer, Hour OFF Timer Auto and steps Manual Auto Washable, AntiMold R0A / 8 / / 8 0 / 7 / / 8 Flare 6. (/).7 (/) Optional / Air Clean Filter Dimensions & Weight Unit Dimensions Package Dimensions Weight Shipping Volume Height Width Depth Height Width Depth Net Shipping kg kg m Indoor Unit 98,06 0,0 79.0.0 0. DATA SUBJECT TO CHANGE WITHOUT NOTICE. 9
Indoor Unit MPAF0RI Power Source Voltage Rating Wall Mounted Indoor Unit 0 to 0V SinglePhase 0Hz 0V Performance Capacity Air Circulation (High) Moisture Removal (High) kw BTU/h m /h Liters/h Cooling 7.,00 890. Heating 8. 9,000 90 Electrical Rating Available Voltage Range Running Amperes Power Input V A W Cooling 0. 6 98 to 6 Heating 0. 6 Features Controls / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) Air Filter Refrigerant Operation Sound Indoor : Hi/Me/Lo/Qt* (*Qt = Quiet mode) Refrigerant Tubing Connections Refrigerant Narrow tube Tube Diameter Wide tube Refrigerant Tube Kit / Accessories Indoor Horizontal Vertical dba (in.) (in.) Microprocessor / I.C. Thermister Wireless Remote Control Unit Hour ON or OFF Timer, Hour OFF Timer Auto and steps Manual Auto Washable, AntiMold R0A / / 8 / 0 / 0 / 7 / 0 Flare 6. (/).88 (/8) Optional / Air Clean Filter Dimensions & Weight Unit Dimensions Package Dimensions Weight Shipping Volume Height Width Depth Height Width Depth Net Shipping kg kg m Indoor Unit 98,06 0,0 79.0.0 0. DATA SUBJECT TO CHANGE WITHOUT NOTICE. 0
Indoor Unit MPAF90MRI Control PCB Part No. Controls Control Circuit Fuse Remote Control Unit CBKMRV96EH Microprocessor 0V.A RCS6MHVPUSE Fan Q'ty... Dia. and Length CrossFlow... D9 / L6 Fan Motor Model... Q'ty No. of Poles Rough Measure RPM (Cool / Heat) Nominal Output Coil Resistance (Ambient Temp. 0 C) Safety Device Over Current Protection OverHeat Protection Run Capacitor Flap Motor Model Rating Coil Resistance (Ambient Temp. C) Heat Exchanger Coil Coil Rows Fin Pitch Face Area W Ohm Micro F VAC Ohm m DC Motor SIC9CVLD87... 8,00 /,00 7 Internal Controller Yes Yes Stepping Motor BYJ896 DC V Each Pair of Terminal : 00 +/ 7% Aluminum Plate Fin / Copper Tube. 0.88 DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Indoor Unit MPAF0MRI Control PCB Part No. Controls Control Circuit Fuse Remote Control Unit CBKMRV6EH Microprocessor 0V.A RCS6MHVPUSE Fan Q'ty... Dia. and Length CrossFlow... D9 / L6 Fan Motor Model... Q'ty No. of Poles Rough Measure RPM (Cool / Heat) Nominal Output Coil Resistance (Ambient Temp. 0 C) Safety Device Over Current Protection OverHeat Protection Run Capacitor Flap Motor Model Rating Coil Resistance (Ambient Temp. C) Heat Exchanger Coil Coil Rows Fin Pitch Face Area W Ohm Micro F VAC Ohm m DC Motor SIC9CVLD87... 8,0 /,0 7 Internal Controller Yes Yes Stepping Motor BYJ896 DC V Each Pair of Terminal : 00 +/ 7% Aluminum Plate Fin / Copper Tube. 0.88 DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Indoor Unit MPAF80RI Control PCB Part No. Controls Control Circuit Fuse Remote Control Unit CBKRV86EH Microprocessor 0V.A RCS6MHVPUSWE Fan Q'ty... Dia. and Length CrossFlow... D9 / L8 Fan Motor Model... Q'ty No. of Poles Rough Measure RPM (Cool / Heat) Nominal Output Coil Resistance (Ambient Temp. 0 C) Safety Device Over Current Protection OverHeat Protection Run Capacitor Flap Motor Model Rating Coil Resistance (Ambient Temp. C) Heat Exchanger Coil Coil Rows Fin Pitch Face Area W Ohm Micro F VAC Ohm m DC Motor SIC9CVLD87... 8,00 /,00 0 Internal Controller Yes Yes Stepping Motor MPZ DC V Each Pair of Terminal : 00 +/ 7% Aluminum Plate Fin / Copper Tube. 0.8 DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Indoor Unit MPAF0RI Control PCB Part No. Controls Control Circuit Fuse Remote Control Unit CBKRV6EH Microprocessor 0V.A RCS6MHVPUSWE Fan Q'ty... Dia. and Length CrossFlow... D9 / L8 Fan Motor Model... Q'ty No. of Poles Rough Measure RPM (Cool / Heat) Nominal Output Coil Resistance (Ambient Temp. 0 C) Safety Device Over Current Protection OverHeat Protection Run Capacitor Flap Motor Model Rating Coil Resistance (Ambient Temp. C) Heat Exchanger Coil Coil Rows Fin Pitch Face Area W Ohm Micro F VAC Ohm m DC Motor SIC9CVLD87... 8,0 /,0 0 Internal Controller Yes Yes Stepping Motor MPZ DC V Each Pair of Terminal : 00 +/ 7% Aluminum Plate Fin / Copper Tube. 0.8 DATA SUBJECT TO CHANGE WITHOUT NOTICE.
. Other Component Specifications Sensor Name Indoor air temp sensor Model No. of sensor DTN TKSS FAVE 0600 TH Quantity of Sensor MPAF90M MPAF0M MPAF80 MPAF0 0 0 0 0 0 0 9 Resistance (k ohm) 8 7 6 0 0 0 0 Temperature ( C) Sensor Name Indoor heat exchanger sensor Model No. of sensor DTN TKSS FAVE 0600 TH Quantity of Sensor MPAF90M MPAF0M MPAF80 MPAF0 0 0 0 0 0 Resistance (k ohm) 00 80 60 0 0 00 80 60 0 0 0 0 0 0 0 0 0 60 70 80 90 Temperature ( C) 6
. DIMENSIONAL DATA Indoor Unit MPAF90MRI MPAF0MRI Unit: (80000000) 7
Indoor Unit MPAF80RI MPAF0RI Unit: (800006000) 8
. REFRIGERANT FLOW DIAGRAM. Refrigerant Flow Diagram Indoor Unit MPAF90MRI MPAF0MRI Indoor unit O.D. 9. (/8") Indoor heat exchanger O.D. 6. (/") Cooling cycle Heating cycle Indoor Unit MPAF80RI Indoor unit O.D..7 (/") Indoor heat exchanger O.D. 6. (/") Cooling cycle Heating cycle Indoor Unit MPAF0R Indoor unit O.D..88 (/8") Indoor heat exchanger O.D. 6. (/") Cooling cycle Heating cycle 9
Indoor Unit MPAF90MRI Cooling Room air temp. : 7 C Fan speed : High Horizontal distance (m) 0 6 7 8 9 0 Axis air velocity (m/s) Vertical distance (m) : Flap angle 0, : Axis air velocity 0 : Flap angle 0, : Axis air velocity 0 Heating Room air temp. : 0 C Fan speed : High Horizontal distance (m) 0 6 7 8 9 Axis air velocity (m/s) Vertical distance (m) : Flap angle, : Axis air velocity : Flap angle 60, : Axis air velocity 60
Indoor Unit MPAF0MRI Cooling Room air temp. : 7 C Fan speed : High Horizontal distance (m) 0 6 7 8 9 0 Axis air velocity (m/s) Vertical distance (m) : Flap angle 0, : Axis air velocity 0 : Flap angle 0, : Axis air velocity 0 Heating Room air temp. : 0 C Fan speed : High Horizontal distance (m) 0 6 7 8 9 Axis air velocity (m/s) Vertical distance (m) : Flap angle, : Axis air velocity : Flap angle 60, : Axis air velocity 60
Indoor Unit MPAF80RI Cooling Room air temp. : 7 C Fan speed : High Horizontal distance (m) 0 6 7 8 9 0 Axis air velocity (m/s) Vertical distance (m) : Flap angle 0, : Axis air velocity 0 : Flap angle 0, : Axis air velocity 0 Heating Room air temp. : 0 C Fan speed : High Horizontal distance (m) 0 6 7 8 9 Axis air velocity (m/s) Vertical distance (m) : Flap angle, : Axis air velocity : Flap angle 60, : Axis air velocity 60
Indoor Unit MPAF0R Cooling Room air temp. : 7 C Fan speed : High Horizontal distance (m) 0 6 7 8 9 0 Axis air velocity (m/s) Vertical distance (m) : Flap angle 0, : Axis air velocity 0 : Flap angle 0, : Axis air velocity 0 Heating Room air temp. : 0 C Fan speed : High Horizontal distance (m) 0 6 7 8 9 Axis air velocity (m/s) Vertical distance (m) : Flap angle, : Axis air velocity : Flap angle 60, : Axis air velocity 60
6. ELECTRICAL DATA 6. Electric Wiring Diagrams Indoor Unit MPAF90MRI MPAF0MRI WARNING To avoid electrical shock hazard, be sure to disconnect power before checking, servicing and/or cleaning any electrical parts. EVAPORATOR FERRITE CORE TERMINAL BASE GRN/YEL WHT WHT RED TO OUTDOOR UNIT FLAP MOTOR FLAP RED PNK BLU BRN YEL CONNECTOR AC IN AC FLAP P (WHT) IN CONTROLLER SI SI LAMP 9P (WHT) 6 7 8 9 6 7 8 9 RED WHT WHT WHT WHT WHT WHT WHT WHT 6 7 8 9 6 7 8 9 IND LAMP ASSY FAN MOTOR FM RED WHT YEL BLU GRN/YEL 6 6 DCM 6P (BLU) E HA JEMA P (WHT) ROOM/COIL/UV 6P (WHT) 6 6 ORG ORG RED UV ASSY ROOM THERMISTOR COIL THERMISTOR 8FA09700
Indoor Unit MPAF80RI MPAF0RI WARNING To avoid electrical shock hazard, be sure to disconnect power before checking, servicing and/or cleaning any electrical parts. EVAPORATOR GRN/YEL TERMINAL BASE WHT RED TO OUTDOOR UNIT FLAP CONNECTOR FLAP MOTOR RED PNK BLU BRN YEL AC AC SI FLAP P(WHT) LAMP 0P(WHT) 6 7 8 9 0 6 7 8 9 0 WHT 6 6 7 7 8 8 9 9 0 0 IND LAMP ASSY CONTROLLER FM FAN MOTOR RED WHT YEL BLU 6 GRN/YEL 6 DCM 6P(BLU) E ROOM/COIL P(WHT) UV P(RED) UV ASSY ROOM THERMISTOR ORG ORG COIL THERMISTOR RED HA JEMA P(WHT) 8FA07700 6
7. FUNCTIONS 7. Operation Functions Emergency operation Emergency operation is available when the remote controller malfunctions, has been lost, or otherwise cannot be used. To operate the system, press the OPERATION button, which is also used as the receiver, below the unit display. Each time this button is pressed, the OPERATION lamp changes color to indicate the type of operation. Select the desired type of operation. COOL HEAT STOP (GREEN) (RED) (Lamp Off) The set temperature is C below the detected room temperature in the case of cooling operation, and C above the room temperature in the case of heating operation. The flap and fan speed settings are AUTO. AUTO cooling/heating operation Selecting the operation mode When AUTO mode is selected, the microprocessor calculates the difference between the set temperature and the room temperature, and automatically switches to Cooling or Heating mode. Room temp. Set temp. COOL Room temp. Set temp. HEAT As shown by the example in the figure below, with AUTO cooling/heating operation, the mode changes between Heating and Cooling mode according to changes in the relationship between the current room temperature and the set temperature. Example Example of operation in AUTO mode with the set room temperature at C. Room temp. Zone A Zone B SENSOR DRY During DRY operation, the system adjusts the room temperature and fan speed according to the conditions in the room, in order to maintain a comfortable room environment. SENSOR DRY operation DRY operation is as shown in the figure below. Load COOL zone A zone B zone Conditions are monitored at all times when the room temperature is below C. DRY A The compressor operation frequency varies. The indoor fan operates with /f fluctuation. DRY B The compressor operates at a low operating frequency. The indoor fan operates with /f fluctuation. Monitor Monitoring operation takes place when the room temperature is below C, or more than C below the set temperature. When the monitoring range is entered, the compressor stops, and the indoor fan operates with /f fluctuation. PAM control In order to further improve inverter performance, control is switched between PWM control at low operation speeds, and PAM control at high operation speeds, making the most effective use of power. Set temp. Zone C Zone C Zone B Zone A More than hour Within hour Compressor ON OFF ON OFF ON Operation mode Cooling Heating Cooling NOTE When multiple indoor units are used and units in other rooms are already operating, they will be set to the same mode of operation as the operating indoor units. 7
HIGH POWER This function acts to raise the power but keeps the AC system in the same operating mode. This function is set with the HIGH POWER button on the remote controller. (It can be set regardless of the temperature and fan speed settings.) HIGH POWER operation from remote controller The unit operates at maximum output for 0 minutes, regardless of the desired temperature. The fan speed is step above "High." Frequency MAX NIGHT SETBACK When NIGHT SETBACK operation is set, the temperature and fan speed settings will be adjusted automatically to allow comfortable sleep. When NIGHT SETBACK operation is set, " mark" appears on the remote controller. The main unit display lamp also becomes dier. COOL and DRY modes When the night setback mode is selected, the air conditioner automatically raises the temperature setting C when 0 minutes have passed after the selection was made, and then another C after another 0 minutes have passed, regardless of the indoor temperature when night setback was selected. This enables you to save energy without sacrificing comfort. This function is convenient when gentle cooling is needed. 0 Start End NOTE When HIGH POWER operation ends, the unit operates at low Hz for minutes, regardless of the thermostat OFF conditions. When in DRY mode, operation is in the cooling zone. Lamp colors OPERATION lamp HEAT operation DRY operation COOL operation DEFROSTING operation TIMER lamp LED CLEAN lamp 0 min. min. Time Red Orange Green Red and Orange alternately Green Green Setting temperature Press the NIGHT SETBACK button HEAT mode When the night setback mode is selected, the air conditioner automatically lowers the temperature setting C when 0 minutes have passed after the selection was made, and then another C after another 0 minutes have passed, regardless of the indoor temperature when night setback was selected. This enables you to save energy without sacrificing comfort. This function is convenient when gentle heating is needed. Setting temperature Press the NIGHT SETBACK button C( F) C( F) 0 min. 0 min. Time C( F) C( F) 0 min. 0 min. Time Timer backup Operation stops if there are no operator controls for hours or longer after unit operation switched from OFF to ON by use of ON timer operation. 8
7. Protective Functions Overload prevention during heating During HEAT operation, the temperature of the indoor heat exchanger is used to control the frequency and lessen the load on the compressor before the protective device is activated. Coldair prevention during heating During heating, the fan speed is set to "LL" (very low) or stopped. As the temperature of the indoor heat exchanger rises, the fan speed is changed to the set speed. Indoor heat exchanger temperature ( C) Indoor heat exchanger Approx. A High A. Control start At stability of operation B. Control end Approx. 7 a b c d B Set fan speed At start of operation a. Area: Automatic capacity control b. When Point A has been exceeded, the operation frequency is reduced by a certain proportion. c. Area: Frequency increase is prohibited. d. At Point B and below, overload prevention is ended and control is the same as in the a area. Freeze prevention During COOL or DRY operation, freezing is detected and operation is stopped when the temperature of the indoor heat exchanger matches the conditions below.. Freezeprevention operation is engaged when the temperature of the indoor heat exchanger is below 6 C.. Restart after freezeprevention operation occurs when the temperature of the indoor heat exchanger reaches 8 C or above. LL Stopped NOTE 0 Approx. 0 Indoor heat exchanger temperature ( C) The fan speed is forcibly changed to "LL" beginning 0 seconds after the thermostat turns OFF. At stability of operation refers to operation when the room temperature has approached the set temperature. When HEAT operation starts, the indoor fan is stopped until the temperature of the indoor heat exchanger reaches 0 C or higher, or until the room temperature reaches C or higher. Indoor heat exchanger temperature ( C) 8 6 * C A B a b c d a. Area: Automatic capacity control b. When the temperature drops below Point A, the operation frequency is reduced by a certain proportion. c. Area: Frequency increase is prohibited. d. When the temperature reaches Point C or above, freezing prevention is ended and control is the same as in the a area. * When the temperature drops to below C (continuously for minutes or longer), the compressor stops. Once the freeze condition is detected, the air conditioner will work less than the maximum frequency until it is turned off. 9
8. TROUBLESHOOTING 8. Precautions before Performing Inspection or Repair After checking the selfdiagnostics monitor, turn the power OFF before starting inspection or repair. Highcapacity electrolytic capacitors are used inside the outdoor unit controller (inverter). They retain an electrical charge (charging voltage DC 0V) even after the power is turned OFF, and some time is required for the charge to dissipate. Be careful not to touch any electrified parts before the controller LED (red) turns OFF. If the outdoor controller is normal, approximately 0 seconds will be required for the charge to dissipate. However, allow at least minutes for the charge to dissipate if there is thought to be any trouble with the outdoor controller. 8. Method of SelfDiagnostics Follow the procedure below to perform detailed trouble diagnostics. NOTE < Clock display > Test run mode Selfdiagnostics mode : If the operation lamp blinks every 0. seconds iediately when the power is turned ON, there is an external ROM (OTP data) failure on the indoor circuit board, or a ROM socket insertion problem, or the ROM has not been installed. : The failure mode is stored in memory even when the power is not ON. Follow the procedure below to perform diagnostics. PROCEDURE After turning on power to the air conditioner, use the remote controller and follow the steps below to execute selfdiagnostics. Step : Press and hold the remote controller QUIET button and HR TIMER button. Then, press and hold the ACL (reset) button with a pointed object such as the tip of a pen. After seconds, release ACL button first, then release QUIET and HR TIMER buttons, "op" (test run) appears, blinking in the remote controller clock display area. Step : Next, press the HR TIMER button once to change the display from "op" to "op" (selfdiagnostics). (The display continues to blink.) Step : Finally press the ON/OFF button to engage selfdiagnostics mode. The selfdiagnostics function utilizes the indicator lamps on the main unit, in combinations of ON lamps, blinking lamps, and OFF lamps, to report the existence of sensor trouble or a protective operation. (The lamps blink or remain ON for seconds, then turn OFF for seconds.) Selfdiagnostics is completed when the buzzer sounds short beeps. A maximum of selfdiagnostics reports are displayed, for seconds each, beginning with the most recent report. Following this display the lamps turn OFF. In order to view the selfdiagnostics results again, press the ON/OFF button again. The lamps remain OFF if no trouble has occurred. <IMPORTANT> After selfdiagnostics is completed, be sure to press the ACL (reset) button to return to normal mode. The air conditioner will not operate if this is not done. QUIET button ON/OFF operation button HR. TIMER button ACL (Reset) button 0
() Selfdiagnostics Lamps LED CLEAN lamp TIMER lamp OPERATION lamp Since the indications cover various units, the corresponding parts listed below may not be present in some models. Indication on indoor unit... OFF... Blinking... ON (Illuminated) Quiet Timer Operation () () () Code Diagnostics items Diagnostics contents S0 S0 S0 Room temperature sensor failure Indoor heat exchanger sensor failure Humidity sensor failure () Sensor open circuit or short circuit () Contact failure at connector or open circuit at terminal crimping location (shortcircuit detection only for the humidity sensor) () Indoor/outdoor PCboard failure S0 S0 S06 S07 E0 E0 E0 E0 E0 E06 E07 E08 E09 E0 E E E Compressor temperature sensor failure Outdoor heat exchanger sensor failure Outdoor air temperature sensor failure Outdoor electrical current detection failure Indoor/outdoor counications failure (serial counications) HIC circuit failure Power Tr (transistor) circuit failure Outdoor unit external ROM (OTP data) failure Peak current cutoff PAM circuit failure Active circuit failure Compressor discharge overheat prevention activated. Indoor fan operating failure way valve switching failure Indoor zerocross failure Norefrigerant protection DC compressor drive circuit failure Outdoor fan operating failure Outdoor system counications failure OLR operation Outdoor power supply open phase Outdoor coil freezing Freezeprevention operation activated. () Sensor open circuit or short circuit () Contact failure at connector or open circuit at terminal crimping location () Outdoor PCboard failure Outdoor PCboard failure () Miswiring () AC power failure () Blown fuse () Power Relay failure () Indoor or outdoor PCboard failure (6) Outdoor Fan Motor failure (7) Reactor failure (8) HighPressure Switch failure (9) Overload Relay failure (0) Magnetic Coil failure * See detailed flowchart in this section. () HIC or power Tr failure () Outdoor fan does not turn. () Instantaneous power outage () Service valve not opened. () Outdoor fan blocked. (6) Continuous overload operation (7) Compressor failure (8) Outdoor PCboard failure () External ROM data failure () Outdoor PCboard failure () Instantaneous power outage () HIC or power transistor failure () Outdoor PCboard failure () Outdoor PCboard failure () Outdoor power supply voltage failure () Electric expansion valve failure () Capillaries choked () Shortage of refrigerant () Continuous overload operation () Outdoor fan does not rotate (6) Outdoor PCboard failure () Fan motor failure () Contact failure at connector () Indoor PCboard failure () way valve failure (heat pump model only) () Outdoor PCboard failure () Service valve not opened. () Shortage of refrigerant () Open phase () Outdoor PCboard failure () Fan motor failure () Contact failure at connector () Outdoor PCboard failure () Miswiring () Blown fuse () Power Relay failure () Outdoor PCboard failure () Compressor failure * See detailed flowchart in this section. () Indoor fan system failure () Shortage of refrigerant () Lowtemperature operation
() If the selfdiagnostics function fails to operate Check the indoor unit. Is the fuse blown? Normal Replace the controller. No indicators illuminate and the indoor fan does not rotate. Check the power voltage. Blown Replace the circuit board or the fuse. 8. Checking the Indoor and Outdoor Units () Checking the indoor unit No. Control Check items (unit operation) Use the remote controller to operate the The rated voltage must be present between interunit wirings and. unit in "TEST run" mode. To determine Connect a k ohm resistor between interunit wirings and. When the whether the mode is currently in voltage at both ends is measured, approximately to V DC must "TEST run" mode, check the indicator be output and the multimeter pointer must bounce once every 8 lamps on the unit. If all are blinking, seconds. the current mode is "TEST run." Or instead of measuring the voltage, you can insert an LED jig and check that the LED flickers once every 8 seconds. If there are no problems with the above, then check the outdoor unit. For the "Test run" procedure, refer to. "HOW TO TEST RUN THE AIR CONDITIONER" on Appendix C. () Checking the outdoor unit No. Control Check items (unit operation) Apply the rated voltage between outdoor The control panel LED (red) must illuminate. unit terminals L and N. Shortcircuit the outdoor unit COM terminal The compressor, fan motor, and way valve must all turn on. to the TRUN terminal. If there are no problems with the above, then check the indoor unit. Using the TEST/TRUN terminals TRUN :Test run (compressor and fan motor turn ON). TEST/MV : Compresses time to /60th (accelerates operation by 60 times faster than normal). TEST/TRUN terminals (TEST)/MV TRUN COM () Checking the serial counications Control Control... OFF... Blinking... Illuminated Initial selfdiagnostics Quiet ( ) Timer ( ) Operation ( ) Shortcircuit terminals and on the indoor unit terminal plate. Quiet ( ) Timer ( ) Operation ( ) Shortcircuit terminals and on the outdoor unit terminal plate. Quiet ( ) Probable location of malfunction Indoor unit circuit board failure Outdoor unit circuit board failure Failure (open circuit, contact failure, etc.) in the interunit wirings Outdoor unit circuit board failure Turn the power OFF before performing short circuiting procedures. Refer to the previous pages when performing system selfdiagnostics. So that the check can be made quickly, indicators blink at first counication after power ON. Before performing the above checks, perform TEST run operation, and check that the rated voltage is output to terminals L and N on the outdoor unit. If it is not output, there is a failure related to the indoor unit power. Timer ( ) Operation ( )
8. Trouble Diagnosis of Fan Motor 8. Indoor Fan Motor This indoor DC fan motor contains an internal control PCB. Therefore, it is not possible to measure the coil resistance, and the following procedure should be used to check the motor. To perform diagnosis, operate the unit in cooling mode with indoor fan speed "High". Next, make sure that the indoor unit receive the signals from the remote controller when the ON/OFF operation button is pressed. Important: (A) Turn OFF the power before connecting or disconnecting the motor connectors. (B) When performing voltage measurement at the indoor controller connector for () in the table below, the DC motor will trip and voltage output will stop approximately minute after operation is started. For this reason, to measure the voltage again, turn OFF the unit once using the remote controller, and then start the air conditioner again. [Trouble symptom ] The fan does not stop when the unit stops. Indoor unit controller trouble. [Trouble symptom ] The fan motor does not rotate when the unit is operating. (Diagnostic procedure) * Disconnect the motor connectors and measure the voltage at the DC motor connectors on the indoor unit controller ( locations). Measurement location () VmGnd: Between pin and pin () VccGnd: Between pin and pin () VsGnd: Between pin and pin Normal value DC 0V or more DC V or more Fluctuation between DC.7 to 6.V (Diagnostic results) All of the above measured values are normal. Fan motor trouble (Replace the motor.) Any one of the above measured values is not normal. Indoor unit controller trouble (Replace the controller.) (Reference) DC motor connector pin arrangement Pin : Vm (red) Pin : Not used Pin : Gnd (black) Pin : Vcc (white) Pin : Vs (yellow) Pin 6: PG (blue) [Trouble symptom ] [Trouble symptom ] [Trouble symptom ] Motor rotates for some time (several seconds), but then quickly stops, when the indoor unit operates. (There is trouble in the system that provides feedback of motor rotation speed from the motor to the indoor unit controller.) Fan motor rotation speed does not change during indoor unit operation. Fan motor rotation speed varies excessively during indoor unit operation. (Remedy for symptom to ) It is not possible to identify whether the trouble is indoor unit controller trouble or motor trouble. Therefore, first replace the indoor unit controller, then (if necessary) replace the DC motor.
8. Noise Malfunction and Electromagnetic Interference An inverter A/C operates using pulse signal control and high frequencies. Therefore, it is susceptible to the effects of external noise, and is likely to cause electromagnetic interference with nearby wireless devices. A noise filter is installed for ordinary use, preventing these problems. However, depending on the installation conditions, these effects may still occur. Please pay attention to the points listed below. () Noise malfunction This refers to the application of highfrequency noise to the signal wires, resulting in abnormal signal pulses and malfunction. Locations most susceptible to noise. Locations near broadcast stations where there are strong electromagnetic waves. Locations near amateur radio (short wave) stations. Locations near electronic sewing machines and arcwelding machines Trouble Either of the following trouble may occur.. The unit may stop suddenly during operation.. Indicator lamps may flicker. Correction (The fundamental concept is to make the system less susceptible to noise.) Insulate for noise or distance from the noise source.. Use shielded wires.. Move unit away from the noise source. () Electromagnetic interference This refers to noise generated by highspeed switching of the microcomputer and compressor. This noise radiates through space and returns to the electric wiring, affecting any wireless devices (televisions, radios, etc.) located nearby. Locations most susceptible to noise. A television or radio is located near the A/C and A/C wiring.. The antenna cable for a television or radio is located close to the A/C and A/C wiring.. Locations where television and radio signals are weak. Trouble. Noise appears in the television picture, or the picture is distorted.. Static occurs in the radio sound. Correction. Select a separate power source.. Keep the A/C and A/C wiring at least meter away from wireless devices and antenna cables.. Change the wireless device s antenna to a highsensitivity antenna.. Change the antenna cable to a BS coaxial cable.. Use a noise filter (for the wireless device). 6. Use a signal booster.
0.880.90.00 0/00 R.D. 8 Reyrieux BP 060 Trévoux CEDEX France Tél. 0.7.00.9.9 Fax 0.7.00..00 R.C.S. BourgenBresse B 79 00 78