Service Manual CAUTION ! WARNING SAFETY CONSIDERATIONS INTRODUCTION. 38MA*R Outdoor Unit Single Zone Ductless System Sizes 09 to 36

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1 38MA*R Outdoor Unit Single Zone Ductless System Sizes 09 to 36 Service Manual TABLE OF CONTENTS PAGE SAFETY CONSIDERATIONS... 1 INTRODUCTION... 1 MODEL / SERIAL NUMBER NOMENCLATURES... 2 SPECIFICATIONS... 3 DIMENSIONS... 4 ELECTRICAL DATA... 4 CONNECTION DIAGRAMS... 5 WIRING DIAGRAMS... 6 FAN AND MOTOR SPECIFICATIONS... 8 REFRIGERATION CYCLE DIAGRAMS... 9 REFRIGERANT LINES... 9 SYSTEM EVACUATION AND CHARGING SYSTEM VACUUM AND CHARGE OPERATION CHARACTERISTICS ELECTRONIC FUNCTIONS INDOOR UNIT DIAGNOSTIC GUIDES DIAGNOSTIC AND SOLUTION OUTDOOR UNIT SIZES APPENDIX SAFETY CONSIDERATIONS Installing, starting up, and servicing air conditioning equipment can be hazardous due to system pressures, electrical components, and equipment location (roofs, elevated structures, etc.). Only trained, qualified installers and service mechanics should install, start up, and service this equipment. Untrained personnel can perform basic maintenance functions such as cleaning coils. All other operations should be performed by trained service personnel. When working on the equipment, observe precautions in the literature and on tags, stickers, and labels attached to the equipment. Follow all safety codes. Wear safety glasses and work gloves. Keep quenching cloth and fire extinguisher nearby when brazing. Use care in handling, rigging, and setting bulky equipment. Read this manual thoroughly and follow all warnings or cautions included in literature and attached to the unit. Consult local building codes and National Electrical Code (NEC) for special requirements. Recognize safety information. This is the safety alert symbol!!. When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand these signal words: DANGER, WARNING, and CAUTION. These words are used with the safety alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.! WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death. Before installing, modifying, or servicing system, main electrical disconnect switch must be in the OFF position. There may be more than 1 disconnect switch. Lock out and tag switch with a suitable warning label.!! WARNING EXPLOSION HAZARD Failure to follow this warning could result in death, serious personal injury, and/or property damage. Never use air or gases containing oxygen for leak testing or operating refrigerant compressors. Pressurized mixtures of air or gases containing oxygen can lead to an explosion. CAUTION EQUIPMENT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation. Do not bury more than 36 in. (914 mm) of refrigerant pipe in the ground. If any section of pipe is buried, there must be a 6 in. (152 mm) vertical rise to the valve connections on the outdoor units. If more than the recommended length is buried, refrigerant may migrate to the cooler buried section during extended periods of system shutdown. This causes refrigerant slugging and could possibly damage the compressor at start up. INTRODUCTION This Service Manual provides the necessary information to service, repair, and maintain the 38MA*R family of heat pumps. Section 2 of this manual has an appendix with data required to perform troubleshooting. Use the Table of Contents to locate a desired topic.

2 MODEL / SERIAL NUMBER NOMENCLATURES Table 1 Unit Sizes SYSTEM TONS kbtuh VOLTAGE -- PHASE OUTDOOR MODEL , MAQB09R , MAQB12R , / MAQB09R , / MAQB12R , / MAQB18R , / MAQB24R , / MAQB30R , / MAQB36R- -3 OUTDOOR UNIT 38 MA Q B 09 R = OUTDOOR UNIT MA = MODEL VOLTAGE 1 = = 208/ SYSTEM TYPE Q = HEAT PUMP MAXIMUM NUMBER OF FAN COIL UNITS THAT CAN BE CONNECTED TO THE OUTDOOR UNIT B=1:1 NOT USED NOMINAL CAPACITY 09-3/4 TON 12-1 TON /2 TONS 24-2 TONS /2 TONS 36-3 TONS UNIT TYPE R = OUTDOOR UNIT V Week of Manufacture Sequential Serial Number Year of Manufacture V = ALL MODELS Use of the AHRI Certified TM Mark indicates a manufacturer s participation in the program For verification of certification for individual products, go to 2

3 SPECIFICATIONS OUTDOOR HEAT PUMP System Electrical Operating Range Piping Refrigerant Outdoor Coil Compressor Outdoor Table 2 Outdoor Heat Pump SIZE Outdoor Model 38MAQB09R--1 38MAQB12R--1 38MAQB09R--3 38MAQB12R--3 38MAQB18R--3 38MAQB24R--3 38MAQB30R--3 38MAQB36R--3 Voltage, Phase, V/Ph/Hz / / / / / / Cycle MCA A MOCP - Fuse Rating A Cooling -4~122-4~122-4~122-4~122-4~122-4~122-4~122-4~122 Outdoor DB F( C) (-20~50) (-20~50) (-20~50) (-20~50) (-20~50) (-20~50) (-20~50) (-20~50) Min - Max Heating Outdoor DB Min - Max Total Piping Length F( C) -4~86 (-20~30) -4~86 (-20~30) -22~86 (-30~30) -22~86 (-30~30) -22~86 (-30~30) -22~86 (-30~30) -4~86 (-20~30) -4~86 (-20~30) ft (m) 82 (25) 82 (25) 82 (25) 82 (25) 98 (30) 98 (30) 164 (50) 164 (50) Piping Lift * ft (m) 32 (10) 32 (10) 32 (10) 32 (10) 65 (20) 65 (20) 82 (25) 82 (25) Pipe Connection Size - in (mm) 1/4 (6.35) 1/4 (6.35) 1/4 (6.35) 1/4 (6.35) 1/4 (6.35) 3/8 (9.52) 3/8 (9.52) 3/8 (9.52) Liquid Pipe Connection Size - Suction in (mm) 3/8 (9.52) 1/2 (12.7) 3/8 (9.52) 1/2 (12.7) 1/2 (12.7) 5/8 (16) 5/8 (16) 5/8 (16) Type R410A R410A R410A R410A R410A R410A R410A R410A Metering Device EEV EEV EEV EEV EEV EEV EEV EEV Charge lbs (kg) 2.76 (1.25) 2.76 (1.25) 3.31 (1.5) 3.31 (1.5) 4.30 (1.95) 5.73 (2.60) 6.06 (2.75) 7.50 (3.40) Face Area Sq. Ft No. Rows Fins per inch Circuits Type Hermetic Rotary DC Inverter Model ASM98D32UFZ ASM98D32UFZ ATM115D43UFZ2 ATM115D43UFZ2 ATF235D22UMT ATF235D22UMT ATF250D22UMT ATF250D22UMT Oil Type VG74 VG74 VG74 VG74 VG74 VG74 VG74 VG74 Oil Charge Fl. Oz Rated Current RLA Unit Width in (mm) (815) (815) (815) (815) (855) (946) (946) (946) Unit Height in (mm) (554) (554) (554) (554) (702) (810) (810) (810) Unit Depth in (mm) (333) (333) (333) (333) (360) (410) (410) (410) Net Weight lbs (kg) 82.9 (37.6) 82.9 (37.6) 91.5 (41.5) 91.5 (41.5) (53.6) (66) (63.4) (66.8) Airflow CFM 1,200 1,200 1,200 1,200 1,390 2,130 2,130 2,130 Sound Pressure db(a) * Condensing unit above or below indoor unit 3

4 DIMENSIONS OUTDOOR Fig. 1 Outdoor Unit A Table 3 Unit Sizes 38MAR UNIT SIZE 9K 12K 9K 12K 18K 24K 30K 36K Voltage 115V 115V 208/230V 208/230V 208/230 V 208/230 V 208/230 V 208/230 V Height (H) in (mm) 21.81(554) 21.81(554) 21.81(554) 21.81(554) (702) 31.89(810) 31.89(810) 31.89(810) Width (W) in (mm) 32.09(815) 32.09(815) 32.09(815) 32.09(815) (855) 37.24(946) 37.24(946) 37.24(946) Depth (D) in (mm) 13.11(333) 13.11(333) 13.11(333) 13.11(333) (360) 16.14(410) 16.14(410) 16.14(410) L1 in (mm) (514) (514) (514) (514) 21.26(540) 26.50(673) 26.50(673) 26.50(673) L2 in (mm) (340) (340) (340) (340) 13.78(350) 15.87(403) 15.87(403) 15.87(403) Operating Weight Lbs (kg) 82.9(37.6) 82.9(37.6) 91.5(41.5) 91.5(41.5) 118.2(53.6) 145.5(66) 139.8(63.4) 147.3(66.8) ELECTRICAL DATA Table 4 Electrical Data MAR OUTDOOR UNIT SIZE 9K 12K 9K 12K 18K 24K 30K 36K Volts-PH-Hz / / / / / / Max Min* Oper. Voltage Power Supply MCA Max Fuse/ CB AMP Compressor Volts-PH-Hz / / / / / / RLA Volts-PH-Hz / / / / / / Outdoor Fan FLA Motor Rated HP Output *Permissible limits of the voltage range at which the unit will operate satisfactorily. LEGEND FLA - Full Load Amps MCA - Minimum Circuit Amps RLA - Rated Load Amps 4

5 WIRING All wires must be sized per NEC (National Electrical Code) or CEC (Canadian Electrical Code) and local codes. Use Electrical Data table MCA (minimum circuit amps) and MOCP (maximum over current protection) to correctly size the wires and the disconnect fuse or breakers respectively. Per the caution note, only stranded copper conductors with a 600 volt rating and double insulated copper wire must be used. The use of BX cable is not recommended. Recommended Connection Method for Power and Communication Wiring Power and Communication Wiring: The main power is supplied to the outdoor unit. The field supplied 14/3 power/communication wiring from the outdoor unit to indoor unit consists of four (4) wires and provides the power for the indoor unit. Two wires are high voltage AC power, one is communication wiring and the other is a ground wire. Recommended Connection Method for Power and Communication Wiring (To minimize communication wiring interference) PowerWiring: The main power is supplied to the outdoor unit. The field supplied power wiring from the outdoor unit to indoor unit consists of three (3) wires and provides the power for the indoor unit. Two wires are high voltage AC power and one is a ground wire. To minimize voltage drop, the factory recommended wire size is 14/2 stranded with a ground. Communication Wiring: A separate shielded Stranded copper conductor only, with a 600 volt rating and double insulated copper wire, must be used as the communication wire from the outdoor unit to the indoor unit. Please use a separate shielded 16GA stranded control wire.! CAUTION EQUIPMENT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation. Wires should be sized based on NEC and local codes. Use copper conductors only with a 600 volt rating and double insulated copper wire.! CAUTION EQUIPMENT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation. Be sure to comply with local codes while running wire from the indoor unit to the outdoor unit. Every wire must be connected firmly. Loose wiring may cause the terminal to overheat or result in unit malfunction. A fire hazard may also exist. Ensure all wiring is tightly connected. No wire should touch the refrigerant tubing, compressor or any moving parts. Disconnecting means must be provided and shall be located within sight and readily accessible from the air conditioner. Connecting cable with conduit shall be routed through the hole in the conduit panel. CONNECTION DIAGRAMS CONNECTING CABLE OUTDOOR TO INDOOR FIELD POWER SUPPLY CONNECTING CABLE OUTDOOR TO INDOOR 208/ FIELD POWER SUPPLY GND L N S Indoor Unit Indoor Power Supply Signal High Voltage GND Ground GND L N S L N Power to Indoor Main Indoor Unit Signal Power Supply High Voltage L1 L2 S Indoor Unit Indoor Power Supply Signal High 208/ Voltage GND Ground L1 L2 S L1 L2 Power to Indoor Main Indoor Unit Signal Power Supply High 208/ Voltage 208/ K and 12K 115V Indoor Unit 9K and 12K 115V Outdoor Unit 9K to 36K 230V Indoor Unit 9K to 36K 230V Outdoor Unit Notes: 1. Do not use the thermostat wire for any connection between indoor and outdoor units. 2. All connections between indoor and outdoor units must be as shown. The connections are sensitive to polarity and will result in a fault code. Fig. 2 Connection Diagrams A

6 WIRING DIAGRAMS Fig. 3 9K & 12K (115V) Outdoor Unit Only Table 5 9K & 12K (115V) CODE PART NAME CODE PART NAME CN1A INPUT: 115V High voltage connector with L/N/Grounf/Signal CN60 Output 115VAC for - 4way valve control CN4_1, CN4_2 Output: 115VAC High voltage connector for Output:PWM for UVW to control compressor CN50 CN4_2, CN4_4 power factor corrector (PFC) (0-320VAC) CN7 Output: PWM for UVM to control the outdoor fan (0-320VAC) CN21 Input: Temperature acquisition (0-5VDC) CN15 CN17 Output: 115VAC High voltage to control the base pan heater Output: 115VAC High voltage to control the crankcase heater CN31 Connector for electronic expansion valve (0-12VDC) 6

7 WIRING DIAGRAMS (CONT) Fig. 4 9K, 12K, & 18K (230V) Outdoor Unit Only Table 6 9K, 12K, & 18K (230V) CODE PART NAME CODE PART NAME CN2 Output: High voltage signal (to the indoor unit) CN12, CN13 Output: High voltage to reactor CN 7, 8 Input: 220 VAC High voltage (from the indoor unit) U V W Output Pulse (0-320VDC) to compressor CN60 Output 220 VAC for 4-way valve control CN10 Input: Pin 1-Pin2 (0-5V) from discharge temperature sensor CN16 Output: 220VAC High voltage to control the crankcase heater CN31 CN414 Output: Pulse (0-320VDC) to the outdoor fan motor CN6-1 Ground Connector CN5 (CN4) Output: 220 VAC High voltage to control the base pan heater CN18 Connector for electronic expansion valve (0-12VDC) Output:Pin5&6 (12V) to the electronic expansion valve 7

8 WIRING DIAGRAMS (CONT) Fig. 5 24K, 30K, & 36K (230V) Outdoor Unit Only FAN AND MOTOR SPECIFICATIONS Outdoor Fan Outdoor Fan Motor Table 7 Fan and Motor Specifications 38MAR UNIT Size 9K 12K 9K 12K 18K 24K 30K 36K (115V) (115V) (208/230V) (208/230V) (208/230V) (208/230V) (208/230V) (208/230V) Material AS AS AS AS AS AS AS AS ZL-429*119*8-3KN ZL-429*119*8-3KN ZL-427*139*8-3 ZL-427*139*8-3 ZL-490*151*12-3 ZL-560*139*12-3 ZL-560*139*12-3KN ZL-560*139*12-3KN Type (ASG30) (ASG30) KN (ASG30) KN (ASG30) KN (ASG30) KN (ASG30) (ASG30) (ASG30) Diameter inch Height inch Model ZKFN L ZKFN L ZKFN L ZKFN L ZKFN ZKFN ZKFN ZKFN Volts V / / / / / /230 Phase Hertz Hz FLA Rated HP HP Output W Type DC Insulation class A A A A A A A A Safe class IPX4 IPX4 IPX4 IPX4 IPX4 IPX4 IPX4 IPX4 Input W Range of current Amps 0.19 ±10% 0.19 ±10% 0.19 ±10% 0.19 ±10% 0.41±10% 0.31±10% 0.31±10% 0.31±10% Rated current Amps Capacitor μf No Capacitor Speed rev/ min 800/700/ /700/ /700/ /700/ /700/ /750/ /800/ /800/750 Rated RPM rev/ min Max. input W

9 REFRIGERATION CYCLE DIAGRAMS REFRIGERANT LINES Fig. 6 Heat Pumps General refrigerant line sizing: 1 The outdoor units are shipped with a full charge of R410A refrigerant. All charges, line sizing, and capacities are based on runs of 25 ft. (7.6 m). For runs over 25 ft. (7.6 m), consult long line section on this page for proper charge adjustments. 2 Minimum refrigerant line length between the indoor and outdoor units is 10 ft. (3 m). 3 Refrigerant lines should not be buried in the ground. If it is necessary to bury the lines, not more than 36 in (914 mm) should be buried. Provide a minimum 6 in (152 mm) vertical rise to the service valves to prevent refrigerant migration. 4 Both lines must be insulated. Use a minimum of 1/2 in. (12.7 mm) thick insulation. Closed cell insulation is recommended in all long line applications. 5 Special consideration should be given to isolating interconnecting tubing from the building structure. Isolate the tubing so that vibration or noise is not transmitted into the structure. 9

10 IMPORTANT: Both refrigerant lines must be insulated separately. The following maximum lengths are allowed: Piping Refrigerant 38MAR SIZE Min. Piping Length Standard Piping Length Max. Outdoor indoor height difference Max. Piping Length with no additional refrigerant charge Max. Piping Length Additional refrigerant charge (between Standard Max piping length) Gas Pipe Liquid Pipe Refrigerant Type Heat Pump Models Charge Amount 9K (115V) Table 8 Piping And Refrigerant Information 12K (115V) 9K (208/230V) 12 (208/230V) 18K (208/230V) 24K (208/230V) 30K (208/230V) 36K (208/230V) Ft (m) 10 (3) 10 (3) 10 (3) 10 (3) 10 (3) 10 (3) 10 (3) 10 (3) Ft (m) 25 (7.6) 25 (7.6) 25 (7.6) 25 (7.6)) 25 (7.6) 25 (7.6) 25 (7.6) 25 (7.6) Ft (m) 32 (10) 32 (10) 32 (10) 32 (10) 65 (20) 65 (20) 82 (25) 82 (25) Ft (m) 25 (7.6) 25 (7.6) 25 (7.6) 25 (7.6) 25 (7.6) 25 (7.6) 25 (7.6) 25 (7.6) Ft (m) 82 (25) 82 (25) 82 (25) 82 (25) 98 (30) 98 (30) 164 (50) 164 (50) Oz/ft (g/m) 0.16 (15) 0.16 (15) 0.16 (15) 0.16 (15) 0.16 (15) 0.32 (30) 0.32 (30) 0.32 (30) in 3/8 1/2 3/8 1/2 1/2 5/8 5/8 5/8 (mm) in 1/4 1/4 1/4 1/4 1/4 3/8 3/8 3/8 (mm) R140A R140A R140A R140A R140A R140A R140A R140A Lbs (kg) Above charge is for piping runs up to 25 ft. (7.6 m). For piping runs greater than 25 ft. (7.6 m), add refrigerant up to the allowable length as specified below. The outdoor unit has an electronic expansion valve to manage the refrigerant flow of the connected fan coil. Long Line Applications,: 1 No change in line sizing is required. 2 Add refrigerant per table below. Table 9 Additional Charge Table Unit Size Total Line Length ft Min Max (3-8) None 2.76 (125) 2.76 (125) 3.31 (1.5) 3.31 (1.5) 4.30 (1.95) 5.73 (2.60) 6.06 (2.75) 7.50 (3.40) Additional Charge, oz/ft. ft (m) >25-82 > (8-25) (25-50) Reduction in capacity due to long lines can be calculated from the chart below. SYSTEM EVACUATION AND CHARGING! CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation. Never use the system compressor as a vacuum pump. Refrigerant tubes and indoor coil should be evacuated using the recommended deep vacuum method of 500 microns. Always break a vacuum with dry nitrogen. 10

11 SYSTEM VACUUM AND CHARGE Using Vacuum Pump 1 Completely tighten all flare nuts and connect manifold gage charge hose to a charge port of the low side service valve (see Fig. 7). 2 Connect charge hose to vacuum pump. 3 Fully open the low side of manifold gage (see Fig. 8). 4 Start the vacuum pump. 5 Evacuate using the triple evacuation method. 6 After evacuation is complete, fully close the low side of manifold gage and stop operation of vacuum pump. 7 The factory charge contained in the outdoor unit is good for up to 25 ft. (8 m) of line length. For refrigerant lines longer than 25 ft. (8 m), add refrigerant as specified in the ADDITIONAL REFRIGERANT CHARGE table in this document. 8 Disconnect charge hose from charge connection of the low side service valve. 9 Fully open service valves B and A. 10 Securely tighten caps of service valves. Outdoor Unit A B Refrigerant Low Side High Side Service Valve Fig. 7 Service Valve 500 microns Low side valve Charge hose Manifold Gage High side valve Charge hose Indoor Unit C D Triple Evacuation Method The triple evacuation method should be used. Refer to Fig. 10 and proceed as follows: 1 Pump system down to 500 MICRONS of mercury and allow pump to continue operating for an additional 15 minutes. 2 Close service valves and shut off vacuum pump. 3 Connect a nitrogen cylinder and regulator to system and open until system pressure is 2 psig. 4 Close service valve and allow system to stand for 10 minutes. During this time, dry nitrogen will be able to diffuse throughout the system absorbing moisture. 5 Repeat this procedure as indicated in Fig. 10. System will then be free of any contaminants and water vapor. EVACUATE BREAK VACUUM WITH DRY NITROGEN WAIT EVACUATE BREAK VACUUM WITH DRY NITROGEN WAIT EVACUATE CHECK FOR TIGHT, DRY SYSTEM (IF IT HOLDS DEEP VACUUM) RELEASE CHARGE INTO SYSTEM Fig. 10 Triple Evacuation Method Final Tubing Check IMPORTANT: Check to be certain factory tubing on both indoor and outdoor unit has not shifted during shipment. Ensure tubes are not rubbing against each other or any sheet metal. Pay close attention to feeder tubes, making sure wire ties on feeder tubes are secure and tight. Vacuum pump Low side valve Fig. 8 Manifold Deep Vacuum Method The deep vacuum method requires a vacuum pump capable of pulling a vacuum of 500 microns and a vacuum gage capable of accurately measuring this vacuum depth. The deep vacuum method is the most positive way of assuring a system is free of air and liquid water (see Fig. 9) LEAK IN SYSTEM VACUUM TIGHT TOO WET 1000 TIGHT 500 DRY SYSTEM MICRONS MINUTES Fig. 9 Deep Vacuum Graph 11

12 OPERATION CHARACTERISTICS Table 10 Operation Characteristics 38MAR SYSTEM SIZE 9K 12K 9K 12K 18K 24K 30K 36K (115V) (115V) (208/230V) (208/230V) (208/230V) (208/230V) (208/230V) (208/230V) Outdoor Min - Max DB F ( C) (-20-50) (-20-50) (-20-50) (-20-50) (-20-50) (-20-50) (-20-50) (-20-50) Cooling Indoor Min - Max DB F Operating Range ( C) (17-30) (17-30) (17-30) (17-30) (17-30) (17-30) (17-30) (17-30) Indoor Min - Max WB F ( C) (15-29) (15-29) (15-29) (15-29) (15-29) (15-29) (15-29) (15-29) Outdoor DB Min Max F ( C) (-20-30) (-20-30) (-30-30) (-30-30) (-30-30) (-30-30) (-20-30) (-20-30) Heating Outdoor WB Min Max F Operating Range ( C) (-20-25) (-20-25) (-20-25) (-20-25) (-20-25) (-20-25) (-20-25) (-20-25) Indoor DB Min Max F ( C) (0-30) (0-30) (0-30) (0-30) (0-30) (0-30) (0-30) (0-30) Operation Humidity % 0-80 % 0-80 % 0-80 % 0-80 % 0-80 % 0-80 % 0-80 % 0-80 % Ambient Humidity % 0-80 % 0-80 % 0-80 % 0-80 % 0-80 % 0-80 % 0-80 % 0-80 % NOTE: 1 If the air conditioner is used beyond the above conditions, certain safety protection features may engage and cause the unit to operate abnormally. 2 The room relative humidity should be less than 80%. If the air conditioner operates beyond this figure, the surface of the air conditioner may attract condensation. Please set the vertical air flow louver to its maximum angle (vertically to the floor), and set the unit to HIGH fan mode. 3 The optimum performance will be achieved during this operating temperature zone. ELECTRONIC FUNCTIONS Main Protection Three minute delay for compressor restart Less than a 1 minute delay for the initial start up and a 3 minute delay for subsequent starts. Compressor top temperature protection The unit stops working when the compressor top temp. protector cuts off, and restarts after the compressor top temp. protector restarts. Compressor discharge temperature protection Compressor discharge temp. T5>239 F(115 C) for 5s, compressor stops. Fan speed is out of control When the indoor fan speed is too low (300RPM) or too high (1500RPM) for a certain time, the unit stops and the LED displays the failure. Inverter module protection The inverter module has a protection function for current, voltage and temperature. If any of these protections engage, the corresponding code displays on the indoor unit and the unit stops working. Indoor fan delayed open function When the unit starts up, the louver is active immediately and the indoor fan opens 10s later. If the unit is running in the heating mode, the indoor fan is will be controlled also by the anti cold wind function. Compressor preheating functions Preheating permitting condition: When the T4 (outdoor ambient temperature)<37.4 F (3 C), the preheating function engages. Zero crossing detection error protection If the AC detects the time interval is not correct for a continuous 240s, the unit stops and the LED displays the failure. The correct zero crossing signal time interval should be between 6 13ms. Sensor protection at open circuit and breaking disconnection If only one temperature sensor malfunctions, the air conditioner continues to work however the error code displays on the LED, in the event of any emergency use. If more than one temperature sensor malfunctions, the air conditioner stops working. Refrigerant leakage detection This function is only active in the COOLING mode. The function helps prevent the compressor from being damaged by a refrigerant leakage or a compressor overload. Open condition: When the compressor is active, the evaporator T2 coil temperature value has no or very little change. 12

13 Operation Modes and Functions Fan Mode 1 Outdoor fan and compressor stop. 2 Temperature setting function is disabled and no setting temperature is displayed. 3 Indoor fan can be set to high/med/low/auto. 4 The louver operates same as in cooling mode. 5 Auto fan Indoor Fan Running Rules: In the COOLING mode, the indoor fan runs continuously and the user can select any of the following speeds: high, medium, low and auto. When the setting temperature is reached, if the compressor stops running, the indoor fan motor runs in the minimum or setting speed. The indoor fan is controlled as shown in the following image. The auto fan adheres to the following rules. Cooling Mode Compressor Running Rules: When T1 Ts < 28.4 F( 2 C), the compressor stops. When T1 TS > 31.1 F( 0.5 C), the compressor activates. When the AC runs in the mute mode, the compressor runs with low frequency. When the current is more than setting value, the current protection function activates, and the compressor stops. Outdoor Fan Running Rules: The outdoor unit runs at a different fan speed according to T4. For different outdoor units, the fan speeds differ. Compressor Temperature Protection When the condenser temperature temperature is higher than the setting value, the compressor stops. 13

14 Evaporator Temperature Protection When the evaporator temperature is lower than the setting value the compressor stops. Heating Mode Compressor Running Rules: When T1 Ts> ΔT, the compressor stops, When T1 TS<ΔT 1.5, the compressor is on. ΔT is the programmed parameter of temperature compensation. When the AC runs in MUTE mode, the compressor runs with a low frequency. When the current is more than the setting value, the current protection function activates and the compressor stops. Outdoor Fan Running Rules The outdoor unit runs at a different fan speed according to T4. For different outdoor units, the fan speeds differ. Auto fan action in the heating mode. Defrosting mode The air conditioning unit enters the defrost mode according to the value of temperature of T3 and the value range of temperature change of T3 plus the compressor running time. During the defrosting mode, the compressor keeps running however the indoor and outdoor motors stop. The indoor unit defrost lamp illuminates and the appears. Evaporator coil temperature protection logo Indoor Fan Running Rules When the compressor is on, the user can set the indoor fan to either high/med/low/auto/mute. When the indoor unit coil temperature is low, the anti cold air function starts and the indoor fan motor runs at the low speed. The speed can not be changed. When the temperature is lower than the setting value, the indoor fan motor stops. When the indoor temperature reaches the setting temperature, the compressor stops, the indoor fan motor runs at the minimum speed or setting speed. The anti cold air function is valid. The indoor fan is controlled shown in the following figure. When the evaporator temperature is higher than the setting protection value, the compressor stops. Auto mode This mode can be selected with the remote controller and the setting temperature can be changed between 62.6 F (17 C) ~86 F(30 C). In auto mode, the unit chooses either cooling, heating or fan only mode according to ΔT. (ΔT =T1 Ts). 14

15 Heating*: For cooling only models, they will run at fan speed. The indoor fan will run in the auto fan speed for the relevant mode. The louver operates the same as in the relevant mode. If the unit switches mode between heating and cooling, the compressor keeps stopping for certain time and then chooses the mode according to T1 Ts. If the setting temperature is modified, the unit choose a running function again. Drying mode Indoor fan speed is fixed at breeze and can not be changed. The louver angle is the same as in the cooling mode. Low indoor room temperature protection In the drying mode, if the room temperature is lower than 50 F (10 C), the compressor stops and does not resume until the room temperature exceeds 53.6 F (12 C). Evaporator anti freezing protection, condenser high temperature protection and outdoor unit frequency limit are active and are the same as that in the cooling mode. The outdoor fan operates the same as in cooling mode. Forced Operation Function Enter forced operation function: When the machine is off, press the Touch button to engage the the Forced Auto Mode. Press the button once again, within 5 seconds, to engage the Forced Cooling Mode. In forced auto, forced cooling or any other operation mode, press the touch button to turn off the unit. In the forced operation mode, all general protections and remote control are available. Operation rules: Forced cooling mode: The compressor runs at the F2 frequency and the indoor fan runs as a breeze. After running for 30 minutes, the unit enters the auto mode as 75.2 F (24 C) setting temperature. Forced auto mode: The forced auto mode is the same as the normal auto mode with a 75.2 F (24 C) setting temperature. Auto Restart function The indoor unit is equipped with an auto restart function, which is carried out through an auto restart module. In case of a sudden power failure, the module memorizes the setting conditions before the power failure. The unit resumes the previous operation setting (not including the swing function) automatically 3 minutes after the power returns. If the memorization condition is the forced cooling mode, the unit runs in the cooling mode for 30 minutes and enters the auto mode as 75.2 F (24 C) setting temp. If the air conditioner turns off before the unit powers off and the air conditioner is required to start up now, the compressor delays for 1 minute when the power is on. Under other conditions, the compressor has a 3 minute delay when it restarts. Refrigerant Leakage Detection With this new technology, the display area displays EC when the outdoor unit detects a refrigerant leak F (8 C) Heating (optional) When the compressor is running, the indoor fan motor runs without the anti cold air function. When the compressor is off, the indoor fan motor is off. Point check function Press the remote controller LED DISPLAY or LED or MUTE button three times, and then press the AIR DIRECTION or SWING button three times in ten seconds (the buzzer rings for two seconds). The air conditioner enters the information enquiry status. The user can press the LED DISPLAY or AIR DIRECTION button to check the next or front item s information. When the air conditioner enters the enquiry information status, it displays the code name in 2 seconds. Refer to Table 11 for details. Point Check Function Press the remote controller LED DISPLAY or LED or MUTE button three times, and then press the AIR DIRECTION or SWING button three times within ten seconds (the buzzer rings for two seconds). The air conditioner will enter the information enquiry status. The user can press the LED DISPLAY or AIR DIRECTION button to check the next command. When the air conditioner enters the information enquiry status, it displays the code name in 2 seconds. When the air conditioner enters the information enquiry status, it displays the code value in the next 25 seconds. Table 11 Enquiry Information ENQUIRY INFORMATION DISPLAYING CODE MEANING T1 T1 T1 temp. T2 T2 T2 temp. T3 T3 T3 temp. T4 T4 T4 temp. T2B Tb T2B temp. TP TP TP temp. TH TH TH temp. Targeted Frequency FT Targeted Frequency Actual Frequency Fr Actual Frequency Indoor fan speed IF Indoor fan speed Outdoor fan speed OF Outdoor fan speed EXV opening angle LA EXV opening angle Compressor continuous Compressor continuous CT running time running time Compressor stop issues ST Compressor stop issues 15

16 When the air conditioner enters the information enquiry status, the LED displays the code value within 25 seconds (see Table 12). ENQUIRY INFORMATION T1,T2,T3,T4, T2B,TP,TH, Targeted Frequency, Actual Frequency Table 12 Enquiry Information DISPLAY VALUE MEANING REMARK -1F,-1E,-1d,-1c,-1 b,-1a -25,-24,-23,-22,-21, A0,A1, A9 100,101, 109 b0,b1, b9 110,111, 119 c0,c1, c9 120,121, 129 d0,d1, d9 130,131, 139 E0,E1, E9 140,141, 149 F0,F1, F9 150,151, All the displaying temperature is actual value. 2 Temperature is C no matter the remote. 3 T1,T2,T3,T4,T2B display range:-25~70, 4 TP display range:-20~ Frenquency display range: 0~159HZ. 6 If the actual value exceeds the range, it displays the maximum value or minimum value. Indoor fan speed /Outdoor fan speed EXV opening angle Compressor continuous running time Causes of compressor stop. Reserve 0 OFF Low speed, Medium speed, 1,2,3,4 High speed, Turbo Actual fan speed=display value turns to decimal value 14-FF and then multiply 10. The unit is RPM. Actual EXV opening value=display value turns to 0-FF decimal value and then multiply 2. 0-FF FF minutes For the detailed meaning, please consult with engineer For some big capacity motors. For some small capacity motors, the display value is from 14-FF (hexadecimal), the corresponding fan speed range is from RPM. If the actual value exceeds the range, it displays the maximum value or minimum value. Decimal display 16

17 INDOOR UNIT DIAGNOSTIC GUIDES Table 13 Diagnostic Guide OPERATION LAMP TIMER LAMP DISPLAY LED STATUS 1 time X E0 Indoor unit EEPROM parameter error 2 times X E1 Indoor / outdoor units communication error 3 times X E2 Zero-crossing signal detection error 4 times X E3 Indoor fan speed has been out of control 5 times X E4 Indoor room temperature sensor T1 open circuit or short circuit 6 times X E5 Evaporator coil temperature sensor T2 open circuit or short circuit 7 times X EC Refrigerant leakage detection 1 times O F0 Overload current protection 2 times O F1 Outdoor ambient temperature sensor T4 open circuit or short circuit 3 times O F2 Condenser coil temperature sensor T3 open circuit or short circuit 4 times O F3 Compressor discharge temperature sensor T5 open circuit or short circuit 5 times O F4 Outdoor unit EEPROM parameter error 6 times O F5 Outdoor fan speed has been out of control 1 times P0 IPM malfunction or IGBT over-strong current protection 2 times P1 Over voltage or over low voltage protection 3 times P2 5 times P4 Inverter compressor drive error O(light) X(off) (flash) High temperature protection of compressor top diagnosis and solution(only for 9k,12k models) 17

18 DIAGNOSIS AND SOLUTION Outdoor Unit Error Display Sizes 9 12 (115V) After the power is on, LED100 (Blue color) flashes slowly (0.2Hz) when the unit is in standby. The LED flashes quickly (2.5Hz) if the unit has an issue. Table 14 Diagnostic Table Sizes 9K 18K No. PROBLEMS LED301 (Green) LED300 (Red) IU DISPLAY 1 standby for normal O X 2 Operation normally X O 3 IPM malfunction or IGBT over-strong current protection X P0 4 Over voltage or too low voltage protection O O P1 5 Over voltage or too low voltage protection O P1 6 Inverter compressor drive error X P4 7 Inverter compressor drive error O P4 8 Inverter compressor drive error P4 O(light) X(off) (2.5Hz flash) 18

19 Sizes 9 12 ( V) 19

20 Sizes ( V) Table 15 Diagnostic Table Sizes 18K 36K No. PROBLEMS LED2 (Green) LED1 (Red) IU DISPLAY 1 standby for normal O X 2 Operation normally X O 3 IPM malfunction or IGBT over-strong current protection X P0 4 Over voltage or too low voltage protection O O P1 5 Over voltage or too low voltage protection O P1 6 Inverter compressor drive error X P4 7 Inverter compressor drive error O P4 8 Inverter compressor drive error P4 20

21 EEPROM Parameter Error Diagnosis and Solution (E0/F4) Error Code E0/F4 Malfunction decision conditions Indoor or outdoor PCB main chip does not receive feedback from the EEPROM chip. Supposed causes Troubleshooting Installation mistake PCB faulty EEPROM: A read only memory whose contents can be erased and reprogrammed using a pulsed voltage. For the location of EEPROM chip, refer to the following images. Fig. 11 Indoor PCB Fig. 12 Outdoor (18K model) PCB NOTE: The two images are for illustration purposes only and may differ from your actual unit. 21

22 Index 1: 1 Indoor or Outdoor DC Fan Motor (control chip is in fan motor). Power on and when the unit is in standby, measure the voltage of pin1 pin3, pin4 pin3 in the fan motor connector. If the voltage value is out of range (see the following table) the PCB must has an issue and must be replaced. Table 16 DC Motor Voltage Input and Output (voltage: V~) NO. COLOR SIGNAL VOLTAGE 1 Red Vs/Vm 280V~380V Black GND 0V 4 White Vcc V 5 Yellow Vsp 0~5.6V 6 Blue FG V Table 17 DC Motor Voltage Input and Output (voltage: 115V~) NO. COLOR SIGNAL VOLTAGE 1 Red Vs/Vm 140V~190V Black GND 0V 4 White Vcc V 5 Yellow Vsp 0~5.6V 6 Blue FG V 2 Outdoor DC Fan Motor (control chip is in the outdoor PCB). Power on and check if the fan can run normally. If the fan can run normally, the PCB has an issue and must be replaced. If the fan can not run normally, measure the resistance of each of the two pins. If the resistance is not equal to each other, the fan motor has an issue and must be replaced. Otherwise the PCB must has an issue and must be replaced. 3 Indoor AC Fan Motor Power the unit on and engage the Fan mode at the high fan speed. After running for 15 seconds, measure the voltage of pin1 and pin2. If the voltage value is less than 100V(208~240V power supply) or 50V (115V power supply), the PCB has an issue and must be replaced. 22

23 Overload Current Protection Diagnosis and Solution (F0) Error Code Malfunction decision conditions Supposed causes F0 An abnormal current rise is detected by checking the specified current detection circuit. Power supply problems System blockage PCB faulty Wiring mistake Compressor malfunction 23

24 Indoor/Outdoor Unit Communication Error Diagnosis and Solution (E1) Error Code Malfunction decision conditions Supposed Causes E1 Indoor unit does not receive feedback from outdoor unit in 110 seconds, and this condition occurs four times continuously. Indoor and outdoor unit communications fault Troubleshooting: 24

25 Remark Use a multimeter to test the DC voltage between the L2 port and S ports of the outdoor unit (Fig. 13). The red pin of multimeter connects with the L2 port while the black pin is for the S port. When the AC is running normally, the voltage will move alternatively between 50V to 50V. If the outdoor unit has a malfunction, the voltage will move alternatively with a positive value. If the indoor unit has a malfunction, the voltage will be a certain value. Example: 10 13VDC small fluctuating amounts indicates indoor unit malfunction. Fig. 13 DC voltage test Remark Use a multimeter to test the resistance of the reactor which does not connect with the capacitor (Fig. 14). The normal values should be around zero ohm. Otherwise, the reactor must has a malfunction and must be replaced. Fig. 14 Reactor resistance test 25

26 Zero Crossing Detection Error Diagnosis and Solution (E2) Error Code Malfunction decision conditions Supposed Causes Troubleshooting: E2 When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing signal interval is abnormal Connection mistake PCB faulty 26

27 Fan Speed has Been Out of Control Diagnosis and Solution (E3) Error Code Malfunction decision conditions Supposed Causes E3 When the indoor fan speed is too slow (300 RPM) for a certain time, the unit stops and the LED displays the failure. Wiring mistake Fan assembly faulty Fan motor faulty PCB faulty Troubleshooting: 27

28 Index 1: Indoor or outdoor DC fan motor (control chip is in fan motor) Measure the resistance value of each winding by using the tester. If any resistance value is zero, the fan motor must have problems and needs to be replaced. Fig. 15 Fan motor Index 2: 1 Indoor or Outdoor DC Fan Motor (control chip is in the fan motor). Power on and when the unit is in standby, measure the voltage of pin 1 pin3, pin4 pin3 in the fan motor connector. If the value of the voltage is not in the range showing in the table below, the PCB has an issue and needs to be replaced. DC motor voltage input and output Fig. 16 Control chip No. COLOR SIGNAL VOLTAGE 1 Red Vs/Vm 280V-380V Black GND OV 4 White Vcc V 5 Yellow Vsp 0~ 5.6V 6 Blue FG V 28

29 2 Outdoor DC Fan Motor (control chip is in the outdoor PCB) Fig. 17 Outdoor DC Fan Motor No Color Orange Grey White Pink Black Signal Hu Hv Hw Vcc GND COLOR RED BLUE YELLOW Signal W V U 1 Release the UVW connector. Measure the resistance of U V, U W, V W. If the resistance is not equal to each other, the fan motor has an issue and needs to be replaced. Otherwise, proceed to step 2. 2 Power on and when the unit is in standby, measure the voltage of pin 4 5 in the feedback signal connector. If the value is not 5V, change the PCB. Otherwise proceed to step 3. 3 Rotate the fan by hand, measure the voltage of pin 1 5, pin 2 5, and pin 3 5 in the feedback signal connector. If any voltage is not positive voltage fluctuation, the fan motor has an issue and must be replaced. 29

30 Open Circuit or Short Circuit of Temperature Sensor Diagnosis and Solution (E5) Error Code E5 Malfunction decision conditions If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays the failure. Supposed Causes Troubleshooting: Wiring mistake Sensor faulty Fig. 18 Test 30

31 Refrigerant Leakage Detection Diagnosis and Solution (EC) Error Code Malfunction decision conditions Supposed caused EC Define the evaporator coil temp.t2 of the compressor just starts running as Tcool. In the beginning 5 minutes after the compressor starts up, if T2 <Tcool-35.6 F(Tcool-2 C) does not keep continuous 4 seconds and this situation happens 3 times, the display area shows EC and AC turns off. T2 sensor faulty Indoor PCB faulty System problems, such as leakage or blocking Troubleshooting 31

32 IPM Malfunction or IGBT Over strong Current Protection Diagnosis and Solution (PO) Error Code Malfunction decision conditions Supposed causes PO When the voltage signal that IPM sends to the compressor drive chip is abnormal, the LED displays PO and the AC turns off. Wiring mistake IPM malfunction Outdoor fan assembly faulty Compressor malfunction Outdoor PCB faulty NOTE: In figures the following is observed: U,V,W references compressor connection point P references input voltage N references output voltage 32

33 Fig. 19 P U Fig. 20 P V 33

34 Fig. 21 P W Fig. 22 N U 34

35 Fig. 23 N V Fig. 24 N W 35

36 Over Voltage or Too Low Voltage Protection Diagnosis and Solution (P1) Error Code P1 Malfunction decision conditions An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit. Supposed causes Troubleshooting: Power supply problems System leakage or block PCB faulty Fig. 25 Test NOTE: Measure the DC voltage between the P and N ports. The normal value should be around 310V. 36

37 High Temperature Protection of Compressor Top Diagnosis and Solution (P2) Error Code P2 Malfunction decision conditions If the sampling voltage is not 5V, the LED displays the failure. Power supply problems Supposed causes System leakage or block PCB faulty Troubleshooting 37

38 Inverter Compressor Drive Error Diagnosis and Solution(P4) Error Code Malfunction decision conditions Supposed causes P4 An abnormal inverter compressor drive is detected by a special detection circuit, including communication signal detection, voltage detection, compressor rotation speed signal detection and so on. Wiring mistake IPM malfunction Outdoor fan assembly fault Compressor malfunction Outdoor PCB faulty 38

39 Main Parts Check 1 Temperature sensor checking Disconnect the temperature sensor from PCB, measure the resistance value with a tester. Fig. 26 Tester Temperature sensors. Room temp. (T1) sensor, Indoor coil temp. (T2) sensor, Outdoor coil temp. (T3) sensor, Outdoor ambient temp. (T4) sensor, Compressor discharge temp. (T5) sensor. Measure the resistance value of each winding by using the multi meter. 39

40 Compressor Checking Measure the resistance value of each winding by using the tester. Fig. 27 Tester Terminal Blue - Red Blue - Black Red - Blue Resistance Value Terminal one Terminal two Terminal three 0.8Ω 1.77Ω 0.55Ω (68 F/20 C) (68 F/20 C) (68 F/20 C) Fig. 28 Compressor Checking 40

41 IPM Continuity Check Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital tester to measure the resistance between P and UVWN; UVW and N. DIGITAL TESTER NORMAL RESISTANCE VALUE DIGITAL TESTER NORMAL RESISTANCE VALUE (+)Red P (-)Black N U V W (Several MΩ) Indoor AC Fan Motor Measure the resistance value of each winding by using the tester. (+)Red U V W (+)Red (-)Black N (Several MΩ) Fig. 29 Indoor AC Fan Motor TERMINAL RESISTANCE VALUE Black - Red White - Black 100.5Ω±8% (20 C /68 F) (Brand: Weiling) 64.5Ω±8% (20 C /68 F) (Brand: Weiling) 100Ω±8% (20 C /68 F) (Brand: Dayang) 68.5Ω±8% (20 C /68 F) (Brand: Dayang) 41

42 OUTDOOR UNIT SIZES 9 12K 115V No. Part name Procedures Remarks 1. Panel plate Remove the panel plate. 1. Stop operation of the air conditioner and turn off the power breaker. 2. Remove the big handle first. Next, Screws of top panel (3 screws, 1 screws is under the big remove the top cover (3 screws). 3. Remove the screws of front panel (6 screws). 3 screws of the big handle Screws of front panel (6 screws) 4. Remove the right side panel screws (6 screws). 42

43 OUTDOOR UNIT SIZES 9 12K 115V (CONT) 2. Fan ass y Remove the fan ass y. Fan ass y Electronic control box 1. After removing the panel plate (review step 1) proceed to step 2. Reactor Compressor and liquid-gas separator 2 2. Remove the nut securing the fan and remove the fan Disconnect the hooks. Open the electronic control box cover. 43

44 OUTDOOR UNIT SIZES 9 12K 115V (CONT) 4. Disconnect the fan motor connector from the electronic control 4 board Remove the fan motor screws (four), then remove the motor. 44

45 OUTDOOR UNIT SIZES 9 12K 115V (CONT) 3. Electrical parts Remove the electrical parts. 1. After steps 1 and 2 are complete, remove the 1 two connectors for the compressor and the reactors. 2. Pull out the two blue 2 wires connected with the 4-way valve. 3. Pull out the connectors 3 of the compressor top temp. sensor, condenser coil temp. sensor (T3),outdoor ambient temp. sensor (T4) and discharge temp. sensor (T5). 45

46 OUTDOOR UNIT SIZES 9 12K 115V (CONT) 4. Disconnect the compressor crankcase heater connection. 5. Disconnect the electronic expansion 5 valve wire from the control board Remove the ground wires. 7. Remove the power supply wires(l1,l2,s). 8. Remove the electronic control box. 46

47 OUTDOOR UNIT SIZES 9 12K 115V (CONT) 4. Four-way valve Remove the 4-way valve. 1. Complete the previous removal steps (1-3). The picture of 4-way valve may be different from the one on your side. 2. Recover the refrigerant from the refrigerant circuit. 3. Remove the coil screw and then remove the coil. 4. Detach the welded parts of the 4-way valve and pipe. 5. Remove the 4-way valve ass y Compressor Remove the compressor Complete the previous removal steps (1-3). 2. Remove the discharge pipe and suction pipe with a burner. 3. Remove the hex nuts and washers securing the compressor on the bottom plate. 4. Lift the compressor from the base pan assembly. 3 47

48 SIZES 9 12K ( V) No. Part name Procedures Remarks 1. Panel plate Remove the panel plate 1. Stop the air conditioner and turn off the power breaker. Screws of top panel (3 screws, 1 screw is under the big handler) 3 screws of the big handler 6 screws of front panel 2. Remove the big handle first. Next, remove the top panel (3 screws). 3. Remove the front panel screws (6 screws). 4. Remove the right side panel screws (8 screws). 48

49 SIZES 9 12K ( V) (CONT) 2. Fan ass y Remove the fan ass y After removing the panel plate, remove the hex nut securing the fan. Next, remove the fan Remove the hooks and open the electronic control box cover. Compressor T3, T4, T5 sensor Motor Electronic expansion valve 4 way valve 49

50 SIZES 9 12K ( V) (CONT) 3. Disconnect fan motor connector from the 3 electronic control board. 4. Remove the four fan 4 motor screws. 5. Next, remove the fan motor. 3. Electrical parts Remove the electrical parts. 1. After completing steps 1 and 2, remove the compressor connectors Pull out the two blue wires connected with the 4- way valve. 50

51 SIZES 9 12K ( V) (CONT) 3. Pull out the 3 compressor connectors top temp. sensor, condenser coil temp. sensor (T3), outdoor ambient temp. sensor (T4) and discharge temp. sensor (T5) Disconnect the electronic expansion valve wire Remove the grounding screw. 6. Remove the power supply wires (L1,L2,S). 7. Remove the electronic control box. 51

52 SIZES 9 12K ( V) (CONT) 4. 4-way valve How to remove the 4-way valve. The picture of 4-way valve may be different from the one on your side. 1. Complete steps Recover the refrigerant from the refrigerant circuit. 3. Remove the coil screw and remove the coil. 4. Detach the welded parts of the 4-way valve and pipe. 5. Remove the 4-way valve ass y Compressor Remove the compressor Complete steps Remove the discharge pipe and the suction pipe with a burner. 3. Remove the hex nuts and washers that secure the compressor to the bottom plate Lift the compressor from the base pan assembly. 52

53 SIZES 18K ( V) No. Part name Procedures Remarks 1. Panel plate Remove the panel plate. 1. Stop the air conditioner and turn off the power breaker. 4 screws of top panel 3 screws of big handle 9 screws of front panel 2. Remove the top panel (7 screws) Remove the front panel screws (9 4 screws). 4. Remove the right side panel screws (10 screws). 3 53

54 SIZES 18K ( V) (CONT) 2. Fan ass y Remove the fan ass y 1 1. After removing the panel plate, remove the hex nut securing the fan. Next, remove the fan Release the hooks and open the electronic control box cover. T3,T4,T5 sensor wire Compressor wire Motor wire Electronic expansion valve 4 way valve wire Electric pipe heater and Crankcase electric heater 54

55 SIZES 18K ( V) (CONT) 3. Disconnect the fan motor connector from 3 the electronic control board. 4. Remove the four fan 4 motor screws. 5. Remove the fan motor. 2. Electrical parts Remove the electrical parts. 1. After completing steps 1 and 2, remove the connectors for the compressor and reactor. 1 55

56 SIZES 18K ( V) (CONT) 2. Pull out the two blue wires connected with the 4- way valve Pull out the connectors of the compressor top temp. sensor, condenser coil temp. sensor (T3), outdoor ambient temp. sensor (T4) and discharge temp. sensor (T5) Disconnect the electronic expansion valve wire. 56

57 SIZES 18K ( V) (CONT) 5. Remove the compressor crankcase 5 electric heater. 6. Remove the grounding screw. 7. Remove the power supply wires (L1,L2, S) Remove the electronic control box. 7 57

58 SIZES 18K ( V) (CONT) 4. 4-way valve Remove the 4-way valve. 1. Complete steps Recover the refrigerant from the refrigerant This picture of the 4-way valve may differ from the user s actual valve. 3 circuit. 3. Remove the coil screw and remove the coil. 4. Detach the welded parts of the 4-way valve and pipe. 5. Remove the 4-way valve ass y. 5. Compressor Remove the compressor 2 1. Complete steps Remove the discharge pipe and suction pipe with a burner. 3. Remove the hex nuts and washers securing the compressor on the bottom plate. 4. Lift the compressor from the base pan assembly. 3 58

59 SIZES 24K ( V) No. Part name Procedures Remarks 1. Panel plate Remove the panel plate 1. Stop the air conditioner operation and turn off the power breaker. 3 screws of top panel 4 screws of big handle 11 screws of front panel 2 2. Remove the big handle first, then remove the top panel (7screws) Remove the front panel screws (11 screws). 4. Remove the right side 3 plate screws and remove the right side plate (12 screws). 59

60 SIZES 24K ( V) (CONT) 2. Fan ass y Remove the fan ass y 1 1. After removing the panel plate, remove the hex nut securing the fan and remove the fan Loosen the hooks and screws, then open the electronic control box cover. T3,T4,T5 sensor wire Compressor Electric pipe heater and Crankcase 4 way valve Electronic expansion electric Valve wire Motor wire 60

61 SIZES 24K ( V) (CONT) 3. Disconnect the fan 3 motor connector from the electronic control board Remove the four fan motor screws. 5. Remove the fan motor. 3. Electrical parts Remove the electrical parts 1. After completing steps 1 and 2, remove the three connectors for the compressor, the 1 compressor crankcase 2 heater, and the electric heater. 2. Pull out the two blue wires connected with the 4-way valve. 61

62 SIZES 24K ( V) (CONT) 3. Remove the 3 connectors from the compressor top temp. sensor, condenser coil temp. sensor (T3), outdoor ambient temp. sensor (T4) and the discharge temp. sensor (T5) )Disconnect the electronic expansion valve wire from the control board Remove the grounding screw. 6. Remove the power supply wires (L1,L2,S). 7. Remove the electronic control box. 62

63 SIZES 24K ( V) (CONT) 4. 4-way valve Remove the 4-way valve 1. Complete steps Recover the refrigerant The picture of four-way valve may be different from the one on your side. 3 4 from the refrigerant circuit. 3. Remove the coil screw and remove the coil. 4. Detach the welded parts of the 4-way valve and pipe. 5. Remove the 4-way valve ass y. 5. Compressor Remove the compressor 1. Complete steps Remove the discharge pipe and suction pipe with a burner. 3. Remove the hex nuts and washers securing the compressor on the bottom plate. 4. Lift the compressor 3 from the base pan assembly. 63

64 SIZES 30 36K ( V) No. Part name Procedures Remarks 1. Panel plate Remove the panel plate 1. Stop the air conditioner 4 screws of big handle Screws of top panel (3screws, 1screws is under the big handle) and turn off the power breaker. Screws of big \ handle (3 screws) 2. Remove the big handle. Screws of front panel(11 screws) Next, remove the top cover (7 screws) Remove the front panel screws (11 screws) Remove the right side panel screws (13 screws). 64

65 SIZES 30 36K ( V) (CONT) 2. Fan ass y Remove the fan ass y 1. After completing step Electronic control box 1, remove the nut securing the fan, and remove the fan. Compressor 2 2. Loosen the hooks and remove the screws. Open the electronic control box cover. 3 65

66 SIZES 30 36K ( V) (CONT) T3,T4,T5,sensor Pressure switch Compressor wire 5 3. Disconnect the fan motor connector from the electronic control board. Electronic expansion 4 way valve Motor wire 4 4. Remove the four fan motor screws. Next, remove the motor. 5 66

67 SIZES 30 36K ( V) (CONT) 3. Electrical parts Remove the electrical parts 1. After completing steps 1 and 2, remove the compressor connector Pull out the two blue 2 wires connected with the 4-way valve. 3. Pull out the compressor connectors from the 3 compressor top temp. sensor, condenser coil temp. sensor (T3) outdoor ambient temp. sensor (T4) and the discharge temp. sensor (T5). 67

68 SIZES 30 36K ( V) (CONT) 4. Disconnect the pressure switch connector. 5. Disconnect the electronic expansion 5 valve wire from the control board Remove the ground wires. 7. Remove the power supply wires (L1,L2,S). 8. Remove the electronic control box. 68

69 SIZES 30 36K ( V) (CONT) 4. 4-way valve Remove the 4-way valve 1. After completing steps 1-3, recover the The picture of 4-way valve may differ from unit to unit. refrigerant from the refrigerant circuit. 2. Remove the coil screw and remove the coil. 3. Detach the welded parts of the 4-way valve and pipe. 4. Remove the 4-way valve ass y Compressor Remove the compressor 2 1. After completing steps 1-3 remove the discharge pipe and suction pipe with a burner. 2. Remove the hex nuts and washers securing the compressor on the bottom plate. 3. Lift the compressor from the base pan assembly. 3 69

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