Mitsubishi Electric Mr. Slim MUZ-GE15NA-1 Service Manual Download Page 1 | Manualshive

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SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 4
3. SPECIFICATION ················································ 6
4. OUTLINES AND DIMENSIONS ······················ 10
5. WIRING DIAGRAM ·········································· 13
6. REFRIGERANT SYSTEM DIAGRAM ············· 25
7. DATA ································································ 28
8. ACTUATOR CONTROL ··································· 42
9. SERVICE FUNCTIONS ··································· 43

10. TROUBLESHOOTING ····································· 44
11. DISASSEMBLY INSTRUCTIONS ···················· 64

Models

SPLIT-TYPE AIR CONDITIONERS

OUTDOOR UNIT

Indoor unit service manual

MSZ-GE•NA MSY-GE•NA Series (OBH548)

NOTE:

RoHS compliant products have <G> mark on the spec name plate.

HFC

utilized

R410A

No. OBH549

REVISED EDITION-F

PARTS CATALOG (OBB549)

Please void OBH549 REVISED EDITION-E.

MUZ-GE09NA/NA2
MUZ-GE12NA/NA2
MUZ-GE15NA,

-

1

/NA2

MUZ-GE09NA
MUZ-GE09NA2
MUZ-GE12NA
MUZ-GE12NA2
MUZ-GE15NA,

-

1

MUZ-GE15NA2
MUZ-GE18NA,

-

1

MUZ-GE24NA

Revision F:

• MUZ-GE09/12/15NA2, MUZ-GE09/12/15NAH2

and MUY-GE09/12/15NA2 have been added.

MUZ-GE09NAH
MUZ-GE09NAH2
MUZ-GE12NAH
MUZ-GE12NAH2
MUZ-GE15NAH
MUZ-GE15NAH2
MUZ-GE18NAH

MUY-GE09NA/NA2
MUY-GE12NA/NA2
MUY-GE15NA,

-

1

/NA2

TM

MUY-GE18NA,

-

1

MUY-GE24NA

MUY-GE09NA
MUY-GE09NA2
MUY-GE12NA
MUY-GE12NA2
MUY-GE15NA,

-

1

MUY-GE15NA2

MUZ-GE09NAH/NAH2
MUZ-GE12NAH/NAH2
MUZ-GE15NAH/NAH2

1
2
3
...
»

Summary of Contents for Mr. Slim MUZ-GE15NA-1

Page 1: ... the spec name plate HFC utilized R410A No OBH549 REVISED EDITION F PARTS CATALOG OBB549 Please void OBH549 REVISED EDITION E MUZ GE09NA NA2 MUZ GE12NA NA2 MUZ GE15NA 1 NA2 MUZ GE09NA MUZ GE09NA2 MUZ GE12NA MUZ GE12NA2 MUZ GE15NA 1 MUZ GE15NA2 MUZ GE18NA 1 MUZ GE24NA Revision F MUZ GE09 12 15NA2 MUZ GE09 12 15NAH2 and MUY GE09 12 15NA2 have been added MUZ GE09NAH MUZ GE09NAH2 MUZ GE12NAH MUZ GE12N...

Page 2: ...used serviced or disposed of Correct refrigerant is specified in the manuals and on the spec labels provided with our products We will not be held responsible for mechanical failure system malfunction unit breakdown or accidents caused by failure to follow the instructions Revision D Specification has been corrected Capacity Capacity Rated Maximum Power consumption Power consumption Rated Maximum ...

Page 3: ... changed MUZ GE09NA MUZ GE09NAH 1 Defrost heater has been added 2 Reactor has been changed 3 Inverter P C board has been changed MUZ GE12NA MUZ GE12NAH MUZ GE15NA 1 MUZ GE15NAH MUZ GE18NA 1 MUZ GE18NAH 1 Defrost heater has been added 2 Inverter P C board has been changed MUZ GE09NA MUZ GE09NA2 MUZ GE12NA MUZ GE12NA2 MUZ GE15NA 1 MUZ GE15NA2 MUZ GE09NAH MUZ GE09NAH2 MUZ GE12NAH MUZ GE12NAH2 MUZ GE1...

Page 4: ...MUZ GE09NAH2 MUZ GE12NAH2 MUZ GE15NAH2 MUY GE09NA MUY GE12NA MUY GE15NA MUY GE09NA2 MUY GE12NA2 MUY GE15NA2 Air outlet Drain outlet Piping Drain hose Air inlet back and side MUZ GE18NA MUZ GE18NAH MUY GE18NA Air inlet back and side Piping Air outlet Drain hose Drain outlet 2 PART NAMES AND FUNCTIONS OBH549F ...

Page 5: ...5 MUZ GE24NA MUY GE24NA Piping Air outlet Drain outlet Air inlet back and side Drain hose OBH549F ...

Page 6: ...eating 1 4 20 3 61 Power supply V phase Hz 208 230 1 60 Max fuse size time delay A 15 Min circuit ampacity A 12 Fan motor F L A 0 50 Compressor Model KNB073FQDHC KNB092FQAHC R L A 6 6 4 9 6 6 4 9 L R A 8 2 6 1 8 2 6 1 Refrigeration oil Model L 0 32 NEO22 Refrigerant control Linear expansion valve Sound level 1 Cooling dB A 46 49 Heating dB A 50 51 Defrost method Reverse cycle Dimensions W in 31 1 ...

Page 7: ... Max fuse size time delay A 15 Min circuit ampacity A 12 14 Fan motor F L A 0 50 0 93 Compressor Model MUZ MUY GE NA SNB130FQBH MUZ MUY GE NA2 MUZ MUY GE NA 1 MUZ GE NAH NAH2 SNB130FQBHT R L A 7 4 6 8 10 0 L R A 9 3 8 5 12 5 Refrigeration oil Model L 0 45 NEO22 Refrigerant control Linear expansion valve Sound level 1 Cooling dB A 49 54 Heating dB A 51 56 Defrost method Reverse cycle Dimensions W i...

Page 8: ...16 1 Refrigeration oil Model L 0 40 FV50S Refrigerant control Linear expansion valve Sound level 1 Cooling dB A 55 Heating dB A 55 Defrost method Reverse cycle Dimensions W in 33 1 16 D in 13 H in 34 5 8 Weight Ib 119 External finish Munsell 3Y 7 8 1 1 Remote controller Wireless type Control voltage by built in transformer VDC 12 24 Refrigerant piping Not supplied Refrigerant pipe size Min wall th...

Page 9: ...peed 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 5 At Intermediate compressor Speed Cooling rated compressor speed minimum compressor speed 3 minimum compressor speed 3 4 2 OPERATION Mode Condition Intake air temperature F Indoor Outdoor ...

Page 10: ... 32 2 5 7 8 2 23 32 1 3 4 15 3 4 12 12 3 4 13 9 16 11 16 1 9 16 7 8 21 5 8 11 1 32 13 32 31 1 2 19 11 16 5 15 16 11 29 32 17 32 29 32 11 1 4 Air in handle Air in Air out 2 3 8 13 16 Oval hole Drain hole ø1 5 8 GE09 12 15NA NA2 Drain hole ø1 5 16 GE09 12 15NAH NAH2 REQUIRED SPACE 14 in or more 8 in or more 2 4 in or more 4 in or more 1 4 in or more when front and sides of the unit are clear 2 When ...

Page 11: ...6 slot 1 11 32 1 9 16 Drain 3 holes ø1 5 16 GE18NA 3 0 3 5 2 9 16 Liquid 1 4 flared Gas 1 2 flared 3 9 16 8 11 32 4 in or more REQUIRED SPACE 14 in or more 4 in or more 1 20 in more when front and sides of the unit are clear 2 When any 2 sides of left right and rear of the unit are clear Clear 1 20 in or more 2 Drain hole ø1 5 16 GE18NAH Unit inch OBH549F ...

Page 12: ... 16 3 5 4 4 Liquid refrigerant pipe joint Refrigerant pipe flared Ø 3 8 Gas refrigerant pipe joint Refrigerant pipe flared Ø 5 8 14 in or more 4 in or more REQUIRED SPACE 4 in or more 20 in or more 2 1 20 in or more when front and sides of the unit are clear 2 When any 2 sides of left right and rear of the unit are clear Clear 1 Unit inch MUZ GE24NA MUY GE24NA OBH549F ...

Page 13: ...13 MUZ GE09NA MUZ GE12NA 5 WIRING DIAGRAM MUZ GE09NA2 MUZ GE12NA2 OBH549F ...

Page 14: ...14 MUZ GE09NAH MUZ GE12NAH MUZ GE09NAH2 MUZ GE12NAH2 OBH549F ...

Page 15: ...15 MUY GE09NA MUY GE12NA MUY GE09NA2 MUY GE12NA2 OBH549F ...

Page 16: ...16 MUZ GE15NA 1 MUZ GE15NA OBH549F ...

Page 17: ...17 MUZ GE15NAH MUZ GE15NA2 OBH549F ...

Page 18: ...18 MUY GE15NA MUZ GE15NAH2 OBH549F ...

Page 19: ...19 MUY GE15NA 1 MUY GE15NA2 OBH549F ...

Page 20: ...20 MUZ GE18NA MUZ GE18NA 1 OBH549F ...

Page 21: ...21 MUZ GE18NAH MUY GE18NA OBH549F ...

Page 22: ...22 MUY GE18NA 1 OBH549F ...

Page 23: ...23 MUZ GE24NA OBH549F ...

Page 24: ...24 MUY GE24NA OBH549F ...

Page 25: ...uffler MUZ GE12NA MUZ GE12NA2 MUZ GE15NA MUZ GE15NA2 MUZ GE12NAH MUZ GE12NAH2 MUZ GE15NAH MUZ GE15NAH2 MUY GE12NA MUY GE12NA2 MUY GE15NA MUY GE15NA2 Outdoor heat exchanger Flared connection Defrost thermistor RT61 MUZ Discharge temperature thermistor RT62 Flared connection Stop valve with strainar Stop valve with service port Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in h...

Page 26: ... temperature thermistor RT68 Ambient temperature thermistor RT65 Strainer 100 Service port Service port Unit inch MUZ GE24NA MUY GE24NA Service port Service port Outdoor heat exchanger Flared connection Defrost thermistor RT61 MUZ 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 Refrigerant flow...

Page 27: ...NA NA2 MUZ GE09NAH NAH2 MUY GE09NA NA2 1 lb 12 oz 0 1 62 4 86 8 10 11 34 12 96 MUZ GE12NA NA2 MUZ GE12NAH NAH2 MUY GE12NA NA2 2 lb 9 oz MUZ GE15NA NA2 MUZ GE15NAH NAH2 MUY GE15NA NA2 Calculation X oz 1 62 5 oz ft Refrigerant piping length ft 25 Model Outdoor unit precharged Refrigerant piping length one way ft 25 30 40 50 60 70 80 90 100 MUZ GE18NA MUZ GE18NAH MUY GE18NA 3 lb 7 oz 0 1 08 3 24 5 40...

Page 28: ...0 0 14 2 1 38 18 6 13 2 1 52 17 2 12 2 1 64 16 0 11 4 1 74 14 7 10 4 1 82 63 18 7 15 8 1 31 17 4 14 7 1 45 16 2 13 6 1 57 14 7 12 4 1 67 13 4 11 3 1 74 MUZ GE24NA MUY GE24NA 71 27 6 17 0 1 60 25 8 15 9 1 76 24 2 14 9 1 89 22 5 13 9 1 99 20 7 12 8 2 07 67 26 1 19 6 1 51 24 3 18 2 1 67 22 5 16 9 1 80 20 9 15 7 1 91 19 2 14 4 2 00 63 24 5 21 7 1 44 22 7 20 1 1 59 21 2 18 7 1 72 19 2 17 0 1 84 17 6 15...

Page 29: ...0 4 0 92 13 1 1 06 15 6 1 03 17 6 1 09 18 1 1 10 20 5 1 14 70 8 6 0 73 11 1 0 89 13 5 1 04 15 9 1 01 18 0 1 06 18 5 1 08 21 0 1 12 65 9 0 0 70 11 3 0 86 14 1 1 00 16 5 0 98 18 5 1 03 19 1 1 05 21 4 1 10 MUZ GE18NA 75 9 1 0 64 11 9 0 81 14 9 0 95 17 8 1 06 20 1 1 12 20 7 1 13 23 5 1 18 70 9 8 0 62 12 7 0 78 15 5 0 93 18 2 1 04 20 6 1 09 21 2 1 11 24 0 1 16 65 10 3 0 59 13 0 0 75 16 2 0 90 18 8 1 01...

Page 30: ...r WB temperature F Indoor air Wet bulb temperature difference F MUZ GE24NA MUY GE24NA 71 67 63 65 75 85 95 105 115 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 Indoor intake air WB temperature F SHF at rating condition 0 75 634 CFM Airflow Outdoor intake air DB temperature F Total power consumption kW MUZ GE15NA MUZ GE15NAH MUY GE15NA 71 67 63 1 4 1 3 1 2 1 1 1 0 0 9 0 8 Indoor intake air WB temperatur...

Page 31: ...UZ GE12NAH2 75 70 65 0 10 20 30 40 50 60 70 0 4 0 6 0 8 1 0 1 2 1 4 Indoor intake air DB temperature F 413 CFM Airflow Outdoor intake air WB temperature F Total power consumption kW MUZ GE15NAH MUZ GE15NAH2 75 70 65 0 10 20 30 40 50 60 70 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 75 70 65 0 10 20 30 40 ...

Page 32: ...ndoor DB temperature F Outdoor ambient temperature Indoor DB temperature F 86 80 75 70 MUZ GE18NA MUZ GE24NA 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 GE18NAH 75 70 65 0 10 20 30 40 50 60 70 0 6 0 8 1 0 1 2 1 4 1 6 1 8 2 0 2 2 Indoor intake air DB temperature F 512 CF...

Page 33: ... 6870 75 80 85 90 95 100 105 F 280 320 360 400 440 Condensing pressure 86 80 75 70 Suction pressure Outdoor ambient temperature Indoor DB temperature F Outdoor ambient temperature Indoor DB temperature F 86 80 75 70 MUZ GE18NA MUZ GE18NAH MUY GE18NA PSIG 6870 75 80 85 90 95 100 105 F 270 310 350 390 430 PSIG 6870 75 80 85 90 95 100 105 F 100 115 130 145 160 Condensing pressure 86 80 75 70 Suction ...

Page 34: ...bient temperature 5 15 25 35 45 55 65 75 F 5 15 25 35 45 55 65 75 F 60 85 110 135 160 185 210 220 245 270 295 320 345 370 Indoor DB temperature F Condensing pressure Outdoor ambient temperature PSIG PSIG 75 70 65 58Hz Indoor DB temperature F Suction pressure Outdoor ambient temperature 75 70 65 58Hz Heating MUZ Data is based on the condition of outdoor humidity 75 Air flow should be set to High sp...

Page 35: ... temperature F Suction pressure Outdoor ambient temperature 75 70 65 58Hz MUZ GE15NA MUZ GE15NAH 5 15 25 35 45 55 65 75 F 5 15 25 35 45 55 65 75 F 60 85 110 135 160 185 210 260 296 332 368 404 440 Indoor DB temperature F Condensing pressure Outdoor ambient temperature PSIG PSIG 75 70 65 54Hz Indoor DB temperature F Suction pressure Outdoor ambient temperature 75 70 65 54Hz MUZ GE12NA2 MUZ GE12NAH2...

Page 36: ...IG 75 70 65 58Hz Indoor DB tem perature F Suction pressure Outdoor ambient temperature 75 70 65 58Hz MUZ GE24NA 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 temperature F Condensing pressure Outdoor ambient temperature PSIG PSIG 75 70 65 58Hz Indoor DB tem perature F Suction pressure Outdoor ambient temperature 75 ...

Page 37: ...GE12NA MUZ GE12NA2 MUZ GE12NAH MUZ GE12NAH2 Power supply V phase Hz 208 230 1 60 Input kW 0 638 0 737 0 938 1 147 Comp current A 3 32 3 00 3 66 3 31 4 39 3 97 5 41 4 89 Fan motor current A 0 27 0 24 0 30 0 27 0 34 0 31 0 31 0 28 Refrigerant circuit Condensing pressure PSIG 389 331 389 397 Suction pressure PSIG 151 103 133 104 Discharge temperature F 154 152 163 162 Condensing temperature F 115 103...

Page 38: ...NAH Power supply V phase Hz 208 230 1 60 Input kW 1 035 1 569 1 595 1 860 Comp current A 4 86 4 40 7 38 6 67 6 97 6 29 8 36 7 55 Fan motor current A 0 33 0 30 0 34 0 31 0 80 0 72 0 64 0 59 Refrigerant circuit Condensing pressure PSIG 400 431 376 458 Suction pressure PSIG 139 99 117 102 Discharge temperature F 164 179 177 184 Condensing temperature F 117 122 112 127 Suction temperature F 57 31 59 3...

Page 39: ...upply V phase Hz 208 230 1 60 Input kW 1 742 2 282 Comp current A 7 01 6 34 9 59 8 67 Fan motor current A 1 61 1 05 1 13 1 02 Refrigerant circuit Condensing pressure PSIG 395 405 Suction pressure PSIG 141 102 Discharge temperature F 158 171 Condensing temperature F 115 Suction temperature F 52 33 Comp shell bottom temp F 140 148 Ref pipe length ft 25 Refrigerant charge R410A 4 lb 3 oz Indoor unit ...

Page 40: ...E09NAH MUZ GE12NA MUZ GE12NAH MUZ GE09NA2 MUZ GE09NAH2 MUZ GE12NA2 MUZ GE12NAH2 0 50 100 150 0 5 1 0 1 5 2 0 0 50 100 150 0 5 1 0 1 5 0 50 100 150 0 5 1 0 2 0 1 5 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 ...

Page 41: ...requency of compressor var ies 6 To cancel test run operation EMERGENCY OPERATION press EMERGENCY OPERATION switch or any button on remote controller MUZ GE24NA MUY GE24NA 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 frequ...

Page 42: ... 5 seconds before the compressor starts up OFF The fan motor turns OFF 15 seconds after the compressor has stopped running ON OFF Compressor Outdoor fan motor R V coil ON OFF ON OFF COOL 5 seconds HEAT 5 seconds 8 3 RELATION BETWEEN MAIN SENSOR AND ACTUATOR Sensor Purpose Actuator Compressor LEV Outdoor fan motor R V coil MUZ Indoor fan motor Discharge temperature thermistor Protection Indoor coil...

Page 43: ...ents this interference The pre heat control turns ON when the discharge temperature thermistor is 68 F 20 C or below When pre heat control turns ON compressor is energized About 50 W Pre heat control setting JK ON To activate the pre heat control cut the JK wire of the inverter P C board Refer to 10 6 1 OFF To deactivate the pre heat control solder JK wire of the inverter P C board Refer to 10 6 1...

Page 44: ...ly stress on the components 5 When connecting or disconnecting the connectors hold the housing of the connector DO NOT pull the lead wires 3 Troubleshooting procedure 1 Check if the OPERATION INDICATOR lamp on the indoor unit is flashing ON and OFF to indicate an abnormality To make sure check how many times the OPERATION INDICATOR lamp is flashing ON and OFF before starting service work 2 Before ...

Page 45: ... does the upper lamp of OPERATION INDICA TOR lamp stay ON for 3 seconds 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 indoor unit failure mode table Refer to indoor unit service manual Make sure to check at least two consecutive blinking cycles 2 Releasing the failure mode reca...

Page 46: ...ck the blinking pattern and identify the abnormal point by referring to outdoor unit failure mode table 10 2 3 Make sure to check at least two 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 failure parts...

Page 47: ...tart if discharge temperature thermistor reads 212 F 100 C or less 3 minutes later Check refrigerant circuit and refrigerant amount Refer to 10 5 Check of LEV 6 time flash 2 5 seconds OFF High pressure Temperature of indoor coil thermistor exceeds 158 F 70 C in HEAT mode MUZ only Temperature of outdoor heat exchanger temperature thermistor exceeds 158 F 70 C in COOL mode Check refrigerant circuit ...

Page 48: ...elligent power module IPM power module IPM 1 The open phase operation of compressor is detected The interphase short circuit occurs in the output of the intelligent power module IPM power module IPM 1 The compressor winding shorts circuit Reconnect compressor connector Refer to 10 5 How to check inverter compressor 14 time flash 2 5 seconds OFF Stop valve Closed valve 14 time flash 2 5 seconds OFF...

Page 49: ...heat sink ex ceeds 167 176 F 75 80 C or temperature of P C board tem perature thermistor on the inverter P C board exceeds 158 167 F 70 75 C Check around outdoor unit Check outdoor unit air passage Refer to 10 5 Check of outdoor fan motor 11 5 time flash 2 5 seconds OFF High pressure pro tection Temperature of indoor coil thermistor exceeds 158 F 70 C in HEAT mode MUZ only Temperature of outdoor h...

Page 50: ... power voltage drop Short time power failure 2 When the power supply voltage is high Zero cross detecting circuit Zero cross signal for PAM control cannot be detected 21 9 time flash 2 5 seconds OFF Inverter check mode The connector of compressor is disconnected inverter check mode starts Check if the connector of the compres sor is correctly connected Refer to 10 5 How to check inverter compres s...

Page 51: ...istor with your hands to warm it up Refer to 10 6 Test point diagram and voltage 1 Inverter P C board for the chart of thermistor Compressor Measure the resistance between terminals using a tester Temperature 4 104 F 20 40 C Normal Ω GE09 GE12 GE15 18 GE24 U V U W V W 1 36 1 93 1 52 2 17 0 78 1 11 0 83 1 18 Outdoor fan motor Measure the resistance between lead wires using a tester Temperature 4 10...

Page 52: ...peration by pressing EMERGENCY OPERATION switch on the indoor unit TEST RUN OPERA TION Refer to 7 6 Measurement point at 3 points BLK U WHT V BLK U RED W WHT V RED W NOTE 1 Output voltage varies according to power supply voltage 2 Measure the voltage by analog type tester 3 During this check LED of the inverter P C board flashes 9 times Refer to 10 6 1 Measure AC voltage between the lead wires at ...

Page 53: ... of inverter P C board and balance of them See 10 5 3 Direct current voltage between DB61 and MUZ GE09 12 1518 MUY GE09 12 1518 JP715 and JP30 MUZ GE24 MUY GE24 on the inverter P C board 4 Voltage between outdoor terminal block S1 S2 1 Heat the compressor with a drier for about 20 minutes Do not recover refrigerant gas while heating Heating part Connect the compressor and activate the inverter The...

Page 54: ...ve Refer to 10 4 In case CN721 MUZ GE09 12 15 18 CN602 MUZ GE24 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 coil Check if CN721 MUZ GE09 12 15 18 CN602 MUZ GE24 is connected Is there 208 230 VAC between CN721 MUZ GE09 12 15 18 CN602 MUZ GE24 and on the inverter P C board 3 minutes after the power...

Page 55: ...l of outdoor fan motor normal Refer to 10 4 Disconnect the connectors CN931 and CN932 from the inverter P C board Check the connec tion between the connector CN931 and CN932 Disconnect CN932 from the inverter P C board and turn on the power supply Rotate the outdoor fan motor manually and measure the voltage of CN931 Between 1 and 5 Between 2 and 5 Between 3 and 5 Does the voltage between each ter...

Page 56: ...Solder side DB61 260 325 VDC MUZ GE09 12 15NA NA2 NAH NAH2 MUZ GE18NA NAH MUY GE09 12 15NA NA2 MUY GE18NA MUZ GE24NA MUY GE24NA Is there voltage 208 230 VAC between the indoor terminal block S1 and S2 No Yes Replace the indoor electronic control P C board Rectify indoor outdoor connecting wire Yes If LED lights up it is OK If LED flashes refer to 10 3 Does the upper lamp of OPERATION INDICATOR on ...

Page 57: ...erly fix the LEV coil 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 vibrate on touching it Turn ON the power supply Preparation of the remote cont...

Page 58: ...931 CN932 of the outdoor 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 flash 10 times Replace the inverter P C board Check the remedy following LED indication Refer to 10 3 Yes No Yes 10 time flash No Only for MUZ GE24NA MUY GE24NA OBH549F ...

Page 59: ...ect them No A Turn OFF the power supply Check once more if the indoor outdoor connecting wire is not miswiring Short circuit outdoor terminal block S2 and S3 1 B 1 Miswiring may damage indoor electronic control P C board during the operation Be sure to confirm the wiring is correct before the opera tion starts Turn ON the power supply Does the LED on the inverter P C board repeat 3 6 second OFF an...

Page 60: ...h or the installation condition combination of specific conditions such as antennas or wiring Check the followings 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 indo...

Page 61: ...A MUY GE12NA MUY GE15NA MUY GE09NA2 MUY GE12NA2 MUY GE15NA2 10 6 TEST POINT DIAGRAM AND VOLTAGE Back side of unit Fin temperature thermistor RT64 CN642 Ambient temperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 MUZ LEV connector CN724 Bus bar voltage DB61 260 325 VDC Front side of unit 208 230 VAC Smoothing capacitor C62 Output to drive comp...

Page 62: ...n temperature thermistor RT64 CN642 Ambient temperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 MUZ LEV connector CN724 Bus bar voltage DB61 260 325 VDC Front side of unit 208 230 VAC Smoothing capacitor C62 Output to drive compressor LDU LDV LDW Fuse F701 T3 15AL250V Smoothing capacitor C61 Smoothing capacitor C63 Fuse F801 T3 15AL250V Fuse ...

Page 63: ...sistance kΩ Resistance kΩ Resistance kΩ MUZ GE24NA MUY GE24NA Fin temperature thermistor RT64 CN673 Ambient temperature thermistor RT65 CN672 Discharge temperature thermistor RT62 CN671 Defrost thermistor RT61 CN671 MUZ Output to drive outdoor fan motor CN932 Outdoor heat exchanger temperature thermistor RT68 CN671 Fuse F901 T3 15AL250V Fuse F880 T3 15AL250V LEV connector CN724 Jumper wire for cha...

Page 64: ...64 Screws of the conduit cover Conduit plate Conduit cover 1 Slide the sleeve and check if there is a locking lever or not 2 The terminal with this connector 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 Terminal with locking mechanism Detaching points The terminal which h...

Page 65: ...e 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 3 Removing R V coil MUZ 1 Remove the cabinet and panels Refer to 1 2 Disconnect the following connectors Inverter P C board CN721 R V coil 3 Remove the R V coil 65 ...

Page 66: ...m its holder 5 Removing outdoor fan motor 1 Remove the cabinet and panels Refer to 1 2 Disconnect the following connectors Inverter P C board CN931 CN932 Fan motor 3 Remove the propeller nut 4 Remove the propeller 5 Remove the screws fixing the fan motor 6 Remove the fan motor 6 Removing the compressor and 4 way valve 1 Remove the cabinet and panels Refer to 1 2 Remove the inverter assembly Refer ...

Page 67: ...l 5 Remove the top panel 6 Remove the valve cover 7 Disconnect the power supply and indoor outdoor connect ing wire 8 Remove the screws of the cabinet 9 Remove the cabinet 10 Remove the screws of the back panel 11 Remove the back panel Photo 1 Photo 2 67 Screws of the cabinet Screws of the back panel Screw of the top panel Screws of the cabinet Screws of the cabinet Screw of the valve cover Screw ...

Page 68: ...crew of the ground wire and screw 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 remove the inverter P C board from the P C board support Photo 3 Photo 4 Inverter assembly 3 Removing R V coil 1 Remove the cabinet and panels Refer to 1 2 Disconnect the following connectors Inverter P C board CN721 R V coil MUZ...

Page 69: ...or 1 Remove the top panel cabinet and service panel Refer to 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 6 Removing the compressor and 4 way valve 1 Remove the top panel cabinet and service panel Refer to 1 2 Remove the back panel Refer to 1 3 Remove the inverter assembly...

Page 70: ...the valve 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 70 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 p...

Page 71: ...e 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 screw of the PB support 8 Remove the inverter P C board from the relay panel Photo 4 3 Removing R V coil 1 Remove the cabinet and panels Refer to 1 2 Disconnect the following connector Inverter P C board CN602 R V coil MUZ 3 ...

Page 72: ...1 Remove the top panel cabinet and service panel Refer to 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 6 Removing the compressor and 4 way valve 1 Remove the top panel cabinet and service panel Refer to 1 2 Remove the back panel Refer to 1 3 Remove the inverter assembly Re...

Page 73: ...73 OBH549F ...

Page 74: ... REVISED EDITION D Distributed in Apr 2011 No OBH 549 REVISED EDITION C Distributed in Dec 2010 No OBH 549 REVISED EDITION B Distributed in Sep 2010 No OBH 549 REVISED EDITION A 5 Distributed in Jul 2009 No OBH 549 5 Made in Japan New publication effective Dec 2013 Specifications are subject to change without notice HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN ...

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