Mitsubishi Electric MSY-GL-NA Series Service Manual Download Page 1

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HFC

utilized

R410A

INDOOR UNIT

SERVICE MANUAL

No. OBH733

REVISED EDITION-J

Indoor unit service manual

MSZ-GL•NA, MSY-GL•NA Series (OBH732)

MUZ-GL18/24NA

MUZ-GL18/24NAH

MUY-GL18/24NA

PARTS CATALOG (OBB733)

OBH733 REVISED EDITION-H is void.

Revision J:

• A warning when opening or closing the valve has

been added.

CONTENTS

1. TECHNICAL CHANGES ······························3

2. PART NAMES AND FUNCTIONS ··················3

3. SPECIFICATION ········································4

4. OUTLINES AND DIMENSIONS ·····················7

5. WIRING DIAGRAM ·····································9

6. REFRIGERANT SYSTEM DIAGRAM ··········· 21

7. DATA······················································ 24

8. ACTUATOR CONTROL ····························· 39

9. SERVICE FUNCTIONS ······························ 40

10. TROUBLESHOOTING ······························· 41

11. DISASSEMBLY INSTRUCTIONS ················· 65

OUTDOOR UNIT

Models

MUZ-GL09NA -

MUZ-GL09NAH -

MUY-GL09NA -

MUZ-GL12NA -

MUZ-GL12NAH -

MUY-GL12NA -

MUZ-GL15NA -

MUZ-GL15NAH -

MUY-GL15NA -

MUZ-GL18NA -

MUZ-GL18NAH -

MUY-GL18NA -

MUZ-GL24NA -

MUZ-GL24NAH -

MUY-GL24NA -

Summary of Contents for MSY-GL-NA Series

Page 1: ...ICAL CHANGES 3 2 PART NAMES AND FUNCTIONS 3 3 SPECIFICATION 4 4 OUTLINES AND DIMENSIONS 7 5 WIRING DIAGRAM 9 6 REFRIGERANT SYSTEM DIAGRAM 21 7 DATA 24 8 ACTUATOR CONTROL 39 9 SERVICE FUNCTIONS 40 10 TROUBLESHOOTING 41 11 DISASSEMBLY INSTRUCTIONS 65 OUTDOOR UNIT Models MUZ GL09NA U1 U2 U8 MUZ GL09NAH U1 U2 U8 MUY GL09NA U1 U2 MUZ GL12NA U1 U2 MUZ GL12NAH U1 U2 MUY GL12NA U1 U2 MUZ GL15NA U1 U2 MUZ ...

Page 2: ...n corrected Preparation before the repair service Prepare the proper tools Prepare the proper protectors Provide adequate ventilation After stopping the operation of the air conditioner turn off the power supply breaker and pull the power plug Discharge the capacitor before the work involving the electric parts Precautions during the repair service Do not perform the work involving the electric pa...

Page 3: ...ged 3 EXPANSION VALVE has been changed 4 4 WAY VALVE has been changed 5 R V COIL has been changed 6 Compressor has been changed MUZ GL12NA U1 MUZ GL12NA U2 MUZ GL12NAH U1 MUZ GL12NAH U2 1 Fan motor has been changed 2 INVERTER P C BOARD has been changed 3 EXPANSION VALVE has been changed 4 4 WAY VALVE has been changed 5 R V COIL has been changed MUY GL09NA U1 MUY GL09NA U2 1 Fan motor has been chan...

Page 4: ...R L A A 6 2 4 9 6 6 4 9 L R A A 7 7 6 1 8 2 6 1 Refrigeration oil floz L Model 9 1 0 27 FV50S 11 8 0 35 FV50S 9 1 0 27 FV50S 11 8 0 35 FV50S Refrigerant control Linear expansion valve Sound level 1 Cooling dB A 48 49 49 Heating MUZ dB A 50 51 Airflow High Med Low Cooling CFM 1 102 639 Heating MUZ CFM 1 186 1 116 1 045 1 186 1 116 1 045 Fan speed High Med Low Cooling rpm 810 490 Heating MUZ rpm 870...

Page 5: ...ration oil floz L Model 11 8 0 35 FV50S 11 8 0 35 FV50S 11 8 0 35 FV50S 13 5 0 40 FV50S Refrigerant control Linear expansion valve Sound level 1 Cooling dB A 49 49 54 55 Heating MUZ dB A 51 55 55 Airflow High Med Low COOL CFM 1 102 639 1 742 922 2 016 1 769 890 HEAT CFM 1 186 1 045 1 045 1 691 1 691 1 372 1 701 1 701 1 341 Fan speed High Med Low Cooling rpm 810 490 840 450 950 840 450 Heating MUZ ...

Page 6: ...r Speed 70 60 17 15 H0 1 Heating Steady State at minimum compressor Speed 70 60 62 56 5 H1 1 Heating Steady State at minimum compressor Speed 70 60 47 43 H2 V Heating at intermediate compressor Speed 5 70 60 35 33 NOTE 5 At intermediate compressor Speed Rated compressor speed minimum compressor speed 3 minimum compressor speed 3 4 2 OPERATION Mode Condition Intake air temperature F Indoor Outdoor ...

Page 7: ... 12 15NA GL09 12 15NAH REQUIRED SPACE Liquid refrigerant pipe joint Refrigerant pipe flared Ø 1 4 Gas refrigerant pipe joint Refrigerant pipe flared Ø 3 8 GL09 12 Ø 1 2 GL15 4 in 100 mm or more 14 in 350 mm or more 8 in 200 mm or more 2 4 in 100 mm or more Unit inch MUZ GL09NA MUZ GL09NAH MUY GL09NA MUZ GL12NA MUZ GL12NAH MUY GL12NA MUZ GL15NA MUZ GL15NAH MUY GL15NA OBH733J ...

Page 8: ...1 4 GL18 Refrigerant pipe flared Ø 3 8 GL24 Gas refrigerant pipe joint Refrigerant pipe flared Ø 1 2 GL18 Refrigerant pipe flared Ø 5 8 GL24 1 20 in 500 mm or more when front and sides of the unit are clear 14 in 350 mm or more 4 in 100 mm or more REQUIRED SPACE Clear 1 4 in 100 mm or more 20 in 500 mm or more 2 2 When any 2 sides of left right and rear of the unit are clear MUZ GL18NA MUZ GL18NAH...

Page 9: ...9 5 WIRING DIAGRAM MUZ GL09NA U1 U8 MUZ GL12NA U1 MUZ GL09NA U2 MUZ GL12NA U2 OBH733J ...

Page 10: ...10 MUZ GL09NAH U2 MUZ GL12NAH U2 MUZ GL09NAH U1 U8 MUZ GL12NAH U1 OBH733J ...

Page 11: ...11 MUY GL09NA U1 MUY GL12NA U1 MUY GL09NA U2 MUY GL12NA U2 OBH733J ...

Page 12: ...12 MUZ GL15NA U2 MUZ GL15NA U1 OBH733J ...

Page 13: ...13 MUZ GL15NAH U2 MUZ GL15NAH U1 OBH733J ...

Page 14: ...14 MUY GL15NA U1 MUY GL15NA U2 OBH733J ...

Page 15: ...15 MUZ GL18NA OBH733J ...

Page 16: ...16 MUZ GL18NAH OBH733J ...

Page 17: ...17 MUY GL18NA OBH733J ...

Page 18: ...18 MUZ GL24NA OBH733J ...

Page 19: ...19 MUZ GL24NAH OBH733J ...

Page 20: ...20 MUY GL24NA OBH733J ...

Page 21: ...ith service port Service port Service port Outdoor heat exchanger Flared connection Defrost thermistor RT61 MUZ Discharge temperature thermistor RT62 Flared connection Stop valve with strainer Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in heating MUZ Refrigerant pipe ø1 4 ø6 35 with heat insulator R V coil MUZ heating ON cooling OFF Strainer 100 LEV Ambient temperature the...

Page 22: ...stor RT65 Strainer 100 Service port Service port MUZ GL24NA U1 MUY GL24NA MUZ GL24NA U2 MUZ GL24NAH Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve Stop valve with service port Capillary tube O D 0 157 I D 0 094 3 15 16 ø4 0 ø2 4 100 Capillary tube O D 0 118 I D 0 071 21 21 32 ø3 0 ø1 8 550 Refrigerant flow in cool...

Page 23: ...1 2 1 4 MUZ GL24NA MUZ GL24NAH MUY GL24NA 100 50 5 8 3 8 ADDITIONAL REFRIGERANT CHARGE R410A oz NOTE Refrigerant piping exceeding 25 ft requires additional refrigerant charge according to the calculation Model Outdoor unit precharged Refrigerant piping length one way ft 25 30 40 50 60 65 MUZ GL09NA U1 MUZ GL09NA U2 MUZ GL09NAH U1 MUZ GL09NAH U2 MUY GL09NA U2 2 lb 5 oz 0 1 08 3 24 5 40 7 56 8 64 MU...

Page 24: ...13 7 8 7 0 90 12 9 8 2 0 97 12 0 7 6 1 02 11 0 7 0 1 06 67 13 9 10 7 0 77 13 0 10 0 0 85 12 0 9 2 0 92 11 2 8 6 0 98 10 3 7 9 1 02 63 13 1 11 8 0 74 12 1 10 9 0 81 11 3 10 2 0 88 10 3 9 3 0 94 9 4 8 5 0 98 MUZ GL15NA MUZ GL15NAH MUY GL15NA 71 17 2 9 7 0 96 16 0 9 1 1 05 15 1 8 5 1 13 14 0 7 9 1 19 12 9 7 3 1 24 67 16 2 11 4 0 91 15 1 10 6 1 00 14 0 9 8 1 08 13 0 9 1 1 14 12 0 8 4 1 20 63 15 3 12 7...

Page 25: ...Y GL15NA 1 0 0 988 0 967 MUZ GL18NA MUZ GL18NAH MUY GL18NA 1 0 0 985 0 963 0 933 MUZ GL24NA MUZ GL24NAH MUY GL24NA 1 0 0 983 0 956 0 921 3 HEATING CAPACITY CORRECTIONS Model Refrigerant piping length one way ft 25 std 40 65 100 MUZ GL09NA MUZ GL09NAH MUZ GL12NA MUZ GL12NAH MUZ GL15NA MUZ GL15NAH 1 0 0 997 0 993 MUZ GL18NA MUZ GL18NAH MUZ GL24NA MUZ GL24NAH 1 0 0 997 0 993 0 987 OBH733J ...

Page 26: ... 1 23 14 1 1 45 16 5 1 48 18 5 1 56 19 1 1 58 21 4 1 66 MUZ GL18NA 75 9 5 0 99 12 5 1 25 15 7 1 47 18 7 1 64 21 1 1 72 21 7 1 75 24 6 1 81 70 10 3 0 95 13 3 1 21 16 2 1 44 19 1 1 60 21 6 1 68 22 2 1 71 25 2 1 78 65 10 8 0 91 13 6 1 16 17 0 1 39 19 8 1 55 22 2 1 64 22 9 1 66 25 7 1 75 MUZ GL18NAH 75 9 5 1 12 12 5 1 38 15 7 1 60 18 7 1 64 21 1 1 72 21 7 1 75 24 6 1 81 70 10 3 1 08 13 3 1 34 16 2 1 5...

Page 27: ...door intake air WB temperature F SHF at rating condition 0 77 399 CFM Airflow Outdoor intake air DB temperature F Total power consumption kW 71 67 63 65 75 85 95 105 115 0 2 0 3 0 4 0 5 0 6 0 7 Indoor intake air WB temperature F SHF at rating condition 0 82 399 CFM Airflow Outdoor intake air DB temperature F Total power consumption kW 71 67 63 65 75 85 95 105 115 0 7 0 8 0 9 1 0 1 1 1 2 1 3 1 4 1 ...

Page 28: ...FM Airflow Outdoor intake air WB temperature F Total power consumption kW 75 70 65 5 5 15 25 35 45 55 65 0 5 0 8 1 1 1 4 1 7 2 0 Indoor intake air DB temperature F 463 CFM Airflow Outdoor intake air WB temperature F Total power consumption kW 65 70 75 5 5 15 25 35 45 55 65 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 1 0 Indoor intake air DB temperature F 406 CFM Airflow Outdoor intake air WB temperatu...

Page 29: ...kW MUZ GL18NAH 65 70 75 5 5 15 25 35 45 55 65 0 6 0 8 1 0 1 2 1 4 1 6 1 8 2 0 Indoor intake air DB temperature F 646 CFM Airflow Outdoor intake air WB temperature F Total power consumption kW 75 70 65 0 10 20 30 40 50 60 70 1 0 1 4 1 8 2 2 2 6 3 0 Indoor intake air DB temperature F 738 CFM Airflow Outdoor intake air WB temperature F Total power consumption kW MUZ GL24NAH 65 70 75 0 10 20 30 40 50 ...

Page 30: ...perature F Outdoor ambient temperature 86 80 75 70 86 80 75 70 65 70 75 80 85 90 95 100 105 200 250 300 350 400 450 500 F F 65 70 75 80 85 90 95 100 105 60 80 100 120 140 160 180 PSIG Condensing pressure Suction pressure Outdoor ambient temperature Indoor DB temperature F PSIG Indoor DB temperature F Outdoor ambient temperature 86 80 75 70 86 80 75 70 65 70 75 80 85 90 95 100 105 200 250 300 350 4...

Page 31: ...r ambient temperature Indoor DB temperature F PSIG Indoor DB temperature F Outdoor ambient temperature 86 80 75 70 86 80 75 70 PSIG 6870 75 80 85 90 95 100 105 F 270 300 330 360 390 420 450 480 PSIG 6870 75 80 85 90 95 100 105 F 110 120 130 140 150 160 170 180 Condensing pressure 86 80 75 70 Suction pressure Indoor DB temperature F Outdoor ambient temperature 86 80 75 70 Indoor DB temperature F Ou...

Page 32: ... temperature 5 15 25 35 45 55 65 75 200 250 300 350 400 450 58Hz Indoor DB temperature F 5 15 25 35 45 55 65 75 0 50 100 150 200 Indoor DB temperature F 58Hz 75 70 65 75 70 65 PSIG Condensing pressure Outdoor ambient temperature F F PSIG Suction pressure Outdoor ambient temperature 5 15 25 35 45 55 65 75 200 250 300 350 400 450 500 58Hz Indoor DB temperature F 5 15 25 35 45 55 65 75 40 65 90 115 1...

Page 33: ...SIG Condensing pressure Outdoor ambient temperature F F PSIG Suction pressure Outdoor ambient temperature 5 15 25 35 45 55 65 75 250 300 350 400 450 500 550 81Hz Indoor DB temperature F 5 15 25 35 45 55 65 75 50 75 100 125 150 175 200 Indoor DB tem perature F 81Hz 5 15 25 35 45 55 65 75 F 75 F 250 275 300 325 350 375 400 425 450 5 15 25 35 45 55 65 50 70 90 110 130 150 170 190 210 Indoor DB temper...

Page 34: ...0 697 0 563 0 697 0 563 Comp current A 2 67 2 41 3 25 2 94 2 45 2 21 3 05 2 76 2 63 2 37 Fan motor current A 0 36 0 33 0 34 0 31 0 36 0 33 0 34 0 31 0 36 0 33 Refrigerant circuit Condensing pressure PSIG 357 345 358 349 358 Suction pressure PSIG 151 107 149 108 149 Discharge temperature F 146 156 148 155 154 Condensing temperature F 108 102 108 104 108 Suction temperature F 61 44 63 44 66 Comp she...

Page 35: ...4 01 3 62 4 86 4 39 4 01 3 62 4 51 4 08 7 11 6 43 4 51 4 08 Fan motor current A 0 41 0 37 0 40 0 36 0 41 0 37 0 41 0 37 0 40 0 36 0 41 0 37 Refrigerant circuit Condensing pressure PSIG 380 402 380 396 427 396 Suction pressure PSIG 133 106 133 138 98 138 Discharge temperature F 166 167 166 168 178 168 Condensing temperature F 112 115 112 115 120 115 Suction temperature F 60 35 60 61 31 61 Comp shel...

Page 36: ...3 5 01 4 53 7 01 6 34 9 59 8 67 7 01 6 34 Fan motor current A 1 05 0 95 1 05 0 95 1 05 0 95 1 16 1 05 1 13 1 02 1 16 1 05 Refrigerant circuit Condensing pressure PSIG 377 391 377 395 405 395 Suction pressure PSIG 144 103 144 141 102 141 Discharge temperature F 149 178 149 158 171 158 Condensing temperature F 111 111 111 115 115 115 Suction temperature F 51 43 51 52 33 52 Comp shell bottom temperat...

Page 37: ...mpressor Correction of Heating capacity The operational frequency of compressor Hz Hz Hz Hz Capacity correction factors Input correction factors Input correction factors Capacity correction factors Correction of Cooling capacity The operational frequency of compressor Correction of Cooling total input The operational frequency of compressor Correction of Heating total input The operational frequen...

Page 38: ...UZ GL18NA MUZ GL18NAH MUY GL18NA MUZ GL18NA MUZ GL18NAH Capacity correction factors Input correction factors Input correction factors Input correction factors Input correction factors Capacity correction factors Correction of Cooling capacity The operational frequency of compressor Correction of Cooling total input The operational frequency of compressor Correction of Heating total input The opera...

Page 39: ... R V coil Indoor fan motor Defrost heater Discharge temperature thermistor Protection Indoor coil temperature thermistor Cooling Coil frost prevention Heating High pressure protection Defrost thermistor MUZ Heating Defrosting Fin temperature thermistor Protection Ambient temperature thermistor Cooling Low ambient temperature operation Heating Defrosting Heater Outdoor heat exchanger tem perature t...

Page 40: ...C or less may cause the following troubles The pre heat control prevents those troubles 1 If moisture gets into the refrigerant cycle and freezes it may interfere the startup of the compressor 2 If liquid refrigerant collects in the compressor a failure in the compressor may occur The pre heat control turns ON when the compressor temperature is 68 F 20 C or below When the pre heat control turns ON...

Page 41: ...are NOT to apply stress on the components 5 When connecting or disconnecting the connectors hold the connector housing DO NOT pull the lead wires 3 Troubleshooting procedure 1 Check if the OPERATION INDICATOR lamp on the indoor unit is blinking on and off to indicate an abnormality To make sure check how many times the OPERATION INDICATOR lamp is blinking on and off before starting service work Se...

Page 42: ...ATOR lamp stay ON for 3 seconds When it stays ON for 3 seconds without beep The outdoor unit is abnormal The indoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to the table of indoor unit failure mode recall function Refer to indoor unit service manual Make sure to check at least 2 consecutive blinking cycles 2 Releasing the failure mode recall function...

Page 43: ...ng pattern and identify the abnormal point by referring to the table of outdoor unit failure mode recall function 10 2 3 Make sure to check at least 2 consecutive blinking cycles 2 Releasing the failure mode recall function Release the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Press RESET button of the remote controller Repair the failu...

Page 44: ...link 2 5 seconds OFF Waveform of compressor current is distorted Reconnect compressor connector Refer to 10 5 How to check inverter compressor 5 time blink 2 5 seconds OFF Discharge temperature Temperature of discharge temperature thermistor exceeds 241 F 116 C compressor stops Compressor can restart if discharge temperature thermistor reads 212 F 100 C or less 3 minutes later Check refrigerant ci...

Page 45: ...h phase current of compressor cannot be detected normally 14 time blink 2 5 seconds OFF Stop valve Closed valve 14 time blink 2 5 seconds OFF Closed valve is detected by compressor current Check stop valve 4 way valve Pipe temperature 16 time blink 2 5 seconds OFF The 4 way valve does not work properly The indoor coil thermistor detects an abnormal temperature Check the 4 way valve Replace the inv...

Page 46: ...tor exceeds 241 F 116 C compressor stops Compressor can restart if discharge temperature thermistor reads 212 F 100 C or less 3 minutes later Check refrigerant circuit and refrig erant amount Refer to 10 5 Check of LEV 10 4 time blink 2 5 seconds OFF Fin temperature P C board tem perature thermistor overheat protection Temperature of the fin temperature thermistor on the heat sink exceeds 167 187 ...

Page 47: ...e temperature thermistor shorts or opens protective operation without that thermistors is performed Refer to 10 5 Check of outdoor thermistors 20 7 time blink 2 5 seconds OFF Low discharge tem perature protection Temperature of discharge temperature thermistor has been 122 F 50 C or less for 20 minutes Refer to 10 5 Check of LEV Check refrigerant circuit and refrig erant amount 21 8 time blink 2 5...

Page 48: ...U1 MUZ GL09NAH U1 MUY GL09NA U1 MUZ GL09NA U2 MUZ GL09NAH U2 MUY GL09NA U2 MUZ GL09NA U8 MUZ GL09NAH U8 MUZ GL12 MUY GL12 MUZ GL15 18 MUY GL15 18 MUZ GL24 MUY GL24 U V U W V W 1 26 1 72 1 59 2 16 1 60 2 17 0 82 1 11 0 87 1 18 W U V WHT RED BLK Outdoor fan motor Measure the resistance between lead wires using a tester Temperature 14 104 F 10 40 C Color of lead wire Normal Ω MUZ GL09 12 15 U1 MUY GL...

Page 49: ...heck of open phase C Check of compressor With the connector between the compressor and the power module IC700 MUZ GL09 12 15 18 MUY GL09 12 15 18 IGBT module IC700 MUZ GL24 MUY GL24 disconnected activate the inverter and check if the inverter is normal by measuring the voltage balance between the terminals Output voltage is 50 130 V The voltage may differ according to the tester Operation method S...

Page 50: ...h a drier for about 20 minutes Do not recover refrigerant gas while heating Heating part Connect the compressor and activate the inverter Then measure the time until the inverter stops due to overcurrent Operation method Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit TEST RUN OPERATION Refer to 7 6 Measurement Measure the time from the start of compres...

Page 51: ...ce of thermistor MUZ GL09 12 15 18 MUY GL09 12 15 18 Thermistor Symbol Connector Pin No Board Defrost MUZ RT61 Between CN641 pin1 and pin2 Inverter P C board Discharge temperature RT62 Between CN641 pin3 and pin4 Fin temperature RT64 Between CN642 pin1 and pin2 Ambient temperature RT65 Between CN643 pin1 and pin2 Outdoor heat exchanger temperature RT68 Between CN644 pin1 and pin3 MUZ GL24 MUY GL24...

Page 52: ...onnect connector between the compressor and the power module IC700 Turn ON the power supply and press EMERGENCY OPERATION switch once COOL mode First of all measure the resistance of R V coil to check if the coil is defective Refer to 10 4 In case CN602 is disconnected or R V coil is open voltage is generated between the terminal pins of the connector although no signal is being transmitted to R V...

Page 53: ...asure the voltage of CN931 Between 1 and 5 Between 2 and 5 Between 3 and 5 Does the voltage between each terminal become 5 and 0 V DC repeatedly Does the outdoor fan motor rotate smoothly Replace the outdoor fan motor Replace the inverter P C board Yes Yes No Fixed to either 5 or 0 V DC No No Yes Check the connection between the connector CN931 and CN932 Disconnect the connectors CN931 and CN932 f...

Page 54: ... there Bus bar voltage 260 370 V DC between DB61 and DB61 MUZ GL09 12 15 18 MUY GL09 12 15 18 294 370 V DC between JP715 and JP30 MUZ GL24 MUY GL24 on the inverter P C board Refer to 10 6 1 No Check the electric parts in main circuit Yes Yes No Disconnect the connector between the compressor and the power module IC700 MUZ GL09 12 15 18 MUY GL09 12 15 18 IGBT module IC700 MUZ GL24 MUY GL24 Turn ON ...

Page 55: ... to the expansion valve Replace the inverter P C board Replace the LEV coil Replace the expansion valve Is LEV coil properly fixed to the expansion valve Does the resistance of LEV coil have the characteristics Refer to 10 4 Do you hear the expansion valve click click Do you feel the expansion valve vibrates when touching it Turn ON the power supply Preparation of the remote controller While press...

Page 56: ...oor fan motor If the connection is poor make it correct Operate the outdoor unit by starting EMERGENCY OPERATION Check the LED indication on the in verter P C board Does the LED blink 10 times Replace the inverter P C board Check the corresponding parts following LED indication Refer to 10 3 Yes No Yes 10 time blink No L Check of inverter P C board OBH733J ...

Page 57: ...d OFF and 0 8 second ON quick blinking 3 Yes No Lit or not lit Replace the inverter P C board 2 2 Be careful of the residual voltage of smoothing capacitor Is there amplitude of 10 to 20 V DC between the indoor terminal block S2 and S3 Confirmation of serial signal Yes Check the wiring If there are any error of the indoor outdoor connecting wire such as the damage of the wire intermediate connecti...

Page 58: ...the outdoor electronic control P C board repeat 3 6 second OFF and 0 8 second ON quick blinking 3 Yes GL24 GL18 No Lit or not lit Replace the inverter P C board or the outdoor electronic control P C board 2 2 Be careful of the residual voltage of smoothing capacitor Turn OFF the power supply Remove the bridge between outdoor terminal block S2 and S3 Yes 3 Be sure to check this within 3 minutes aft...

Page 59: ...re than 5 minutes let the ambient temperature thermistor continue to read 32 F 0 C or below and let the defrost thermistor continue to read 30 F 1 C or below NOTE In case both thermistors are more than the above temperature cool them with cold water etc Has the operation stopped during pump down Was the operation started with the stop valve closed and was it opened during operation No Yes The oper...

Page 60: ...ondition combination of specific conditions such as antennas or wiring Check the following before asking for service 1 Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave 2 Channel frequency broadcast station affected by the electromagnetic noise 3 Channel frequency broadcast station unaffected by the electromagnetic noise 4 Layout of indoor outdoor unit of the a...

Page 61: ...or fan motor CN931 208 230 V AC Outdoor heat exchanger temperature thermistor RT68 CN644 Jumper wire for pre heat control setting JK Heater connector CN722 MUZ GL09 12 15NAH Fuse F801 T3 15AL250V Back side of unit Expansion valve LEV CN724 Output to drive outdoor fan motor CN932 LED 4 14 32 50 68 86 104 0 10 20 30 40 50 60 70 80 90 100 Temperature F Defrost thermistor RT61 Ambient temperature ther...

Page 62: ...58 176 194 212 230 248 Fuse F701 T3 15AL250V 208 230 V AC Fin temperature thermistor RT64 CN642 Ambient temperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 DB61 260 370 V DC Front side of unit 208 230 V AC Smoothing capacitor C62 Output to drive compressor LDU LDV LDW Smoothing capacitor C61 Fuse F901 T3 15AL250V R V coil CN721 208 230 V AC J...

Page 63: ...hermistor RT64 CN642 Ambient temperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 MUZ DB61 260 370 V DC 208 230 V AC Smoothing capacitor C62 Smoothing capacitor C63 Output to drive compressor LDU LDV LDW Fuse F701 T3 15AL250V Smoothing capacitor C61 Fuse F901 T3 15AL250V R V coil 21S4 CN721 MUZ 208 230 V AC Jumper wire for changing defrost set...

Page 64: ...ing JK Fuse F601 T3 15AL250V Signal of out door fan motor CN931 R V coil 21S4 CN602 208 230 V AC MUZ 294 370 V DC JP715 JP30 LED 4 14 32 50 68 86 104 0 10 20 30 40 50 60 70 80 90 100 Temperature F Defrost thermistor RT61 MUZ Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 32 50 68 86 104 122 140 158 176 0 20 40 60 80 100 120 140 160 180 200 Temperature F Fin ...

Page 65: ... check if there is a locking lever or not 2 The terminal with the connector shown below has the locking mechanism Slide the sleeve Pull the terminal while pushing the locking lever Hold the sleeve and pull out the terminal slowly Connector Sleeve Locking lever Detaching method of the terminals with locking mechanism The terminal which has the locking mechanism can be detached as shown below There ...

Page 66: ...ort and the back panel 6 Remove the inverter assembly 7 Remove the screw of the ground wire and screw of the ter minal block support 8 Remove the heat sink support from the P C board support 9 Remove the screw of the inverter P C board and remove the inverter P C board from the P C board support Photo 6 3 Removing R V coil 1 Remove the cabinet and panels Refer to section 1 2 Disconnect the followi...

Page 67: ...discharge temperature thermistor CN643 Ambient temperature thermistor CN644 Outdoor heat exchanger temperature thermistor 3 Pull out the discharge temperature thermistor from its holder 4 Pull out the defrost thermistor from its holder 5 Pull out the outdoor heat exchanger temperature thermistor from its holder 6 Pull out the ambient temperature thermistor from its holder Photo 8 Photo 9 67 Discha...

Page 68: ...ove the inverter assembly Refer to section 2 3 Remove the screws fixing the reactor 4 Remove the reactor 5 Remove the soundproof felt 6 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 PSIG 7 Detach the brazed part of the suction and the discharge pipe connected with compressor 8 Remove the nuts fixing the compressor 9 Remove the compressor ...

Page 69: ...ve the conduit plate 9 Remove the top panel 10 Remove the valve cover 11 Disconnect the power supply and indoor outdoor connect ing wire 12 Remove the screws of the cabinet 13 Remove the cabinet 14 Remove the screws of the back panel 15 Remove the back panel Photo 3 Photo 4 Photo 1 Photo 2 69 Screws of the cabinet Screws of the top panel Screws of the top panel Screw of the back panel Screws of th...

Page 70: ...and the back panel 6 Remove the inverter assembly 7 Remove the screw of the ground wire screw of the P C board cover and screws of the terminal block support 8 Remove the heat sink support from the P C board support 9 Remove the screw of the inverter P C board and the inverter P C board from the P C board support Photo 5 Photo 6 3 Removing R V coil MUZ 1 Remove the cabinet and panels Refer to sect...

Page 71: ...er to section 1 2 Disconnect the following connectors Inverter P C board CN931 and CN932 Fan motor 3 Remove the propeller fan nut 4 Remove the propeller fan 5 Remove the screws fixing the fan motor 6 Remove the fan motor NOTE The propeller fan nut is a reverse thread 6 Removing the compressor and 4 way valve 1 Remove the top panel cabinet and service panel Refer to section 1 2 Remove the back pane...

Page 72: ...cover 9 Disconnect the power supply and indoor outdoor con necting wire 10 Remove the screws of the cabinet 11 Remove the cabinet 12 Remove the screws of the back panel 13 Remove the back panel Photo 2 Photo 1 Photo 3 Photo 4 72 Screws of the top panel Screws of the back panel Screws of the service panel Screws of the back panel Screws of the cabinet Screws of the back panel Screws of the back pan...

Page 73: ...tor CN724 LEV 3 Remove the compressor connector 4 Remove the screws fixing the relay panel 5 Remove the relay panel 6 Remove the ground wires and the lead wires of the inverter P C board 7 Remove the screws of the P B support 8 Remove the inverter P C board from the P B support Photo 5 3 Removing R V coil MUZ 1 Remove the cabinet and panels Refer to section 1 2 Disconnect the following connector I...

Page 74: ... and service panel Refer to section 1 2 Disconnect the following connectors Inverter P C board CN931 and CN932 Fan motor 3 Remove the propeller 4 Remove the screws fixing the fan motor 5 Remove the fan motor NOTE The propeller fan nut is a reverse thread 6 Removing the compressor and 4 way valve 1 Remove the top panel cabinet and service panel Refer to section 1 2 Remove the back panel Refer to se...

Page 75: ...75 OBH733J ...

Page 76: ...REVISED EDITION F Issued Jul 2017 No OBH733 REVISED EDITION E Issued Mar 2017 No OBH733 REVISED EDITION D Issued Sep 2016 No OBH733 REVISED EDITION C Issued Jan 2016 No OBH733 REVISED EDITION B Issued Nov 2015 No OBH733 REVISED EDITION A Published Sep 2015 No OBH733 Made in Japan HEAD OFFICE TOKYO BUILDING 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Specifications are subject to change withou...

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