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Mitsubishi Electric MUZ-HE09NA Service Manual Download Page 41

41

Is the resistance of thermistor normal? (Refer to 10-6.1.)

Reconnect the connector of thermistor.

Turn ON the power supply and press EMERGENCY OPERATION switch. 

No

Replace the thermistor except RT64. When RT64 is 

abnormal, replace the inverter P.C. board.

Does the unit operate for 10 minutes or more 

without showing thermistor abnormality?

OK. (Cause is poor contact.)

Replace the inverter P.C. board.

Thermistor 

Symbol 

Connector, Pin No. 

Board 

Defrost 

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 

Yes

Yes

No

 G  Check of outdoor thermistors

 H  Check of R.V. coil

Disconnect the connector of thermistor in the inverter P.C. board (see 

below table), and measure the resistance of thermistor.

 First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 10-4.

 In case CN721 (

MUZ-HE09/12/15/18

)/CN602 (

MUZ-HE24

) 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-

HE09/12/15/18

)/CN602 (

MUZ-HE24

) is connected.

Is there 208/230 VAC between CN721 (

MUZ-

HE09/12/15/18

)/CN602 (

MUZ-HE24

)  and   

on the inverter P.C. board 3 minutes after the 

power supply is turned ON?

No

Yes

Replace the inverter

P.C. board.

Replace the 4-way valve. 

Unit operates COOL mode even if it is set to HEAT mode.

Disconnect connector between the 

compressor and intelligent power module/  

power module  1.

Turn ON the power supply and press 

EMERGENCY OPERATION switch twice 

(HEAT mode).

MUZ-HE09/12/15/18NA

Thermistor 

Symbol 

Connector, Pin No. 

Board 

Defrost 

RT61

Between CN671 pin1 and pin2 

Inverter P.C. board

Discharge temperature 

RT62

Between CN671 pin3 and pin4 

Fin temperature 

RT64

Between CN673 pin1 and pin2 

Ambient temperature 

RT65

Between CN672 pin1 and pin2 

Outdoor heat exchanger temperature  RT68

Between CN671 pin5 and pin6

MUZ-HE24NA

1

Intelligent power module: 

MUZ-HE24NA

Power module: 

Other models

OBH686

Summary of Contents for MUZ-HE09NA

Page 1: ...TOR CONTROL 30 9 SERVICE FUNCTIONS 31 10 TROUBLESHOOTING 31 11 DISASSEMBLY INSTRUCTIONS 52 Models SPLIT TYPE AIR CONDITIONERS OUTDOOR UNIT Indoor unit service manual MSZ HE NA Series OBH685 NOTE RoHS compliant products have G mark on the spec name plate HFC utilized R410A No OBH686 PARTS CATALOG OBB686 MUZ HE09NA MUZ HE12NA MUZ HE15NA MUZ HE09NA MUZ HE12NA MUZ HE15NA MUZ HE18NA MUZ HE24NA ...

Page 2: ...d 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 MUZ HE09NA MUZ HE12NA MUZ HE15NA MUZ HE18NA MUZ HE24NA 1 New model 1 TECHNICAL CHANGES OBH686 ...

Page 3: ...et Drain outlet Piping Drain hose Air inlet back and side MUZ HE18NA Air inlet back and side Piping Air outlet Drain hose Drain outlet 2 PART NAMES AND FUNCTIONS MUZ HE24NA Piping Air outlet Drain outlet Air inlet back and side Drain hose OBH686 ...

Page 4: ... 8 2 9 3 12 5 Refrigeration oil Model L 0 32 NEO22 0 45 NEO22 Refrigerant control Linear expansion valve Sound level 1 Cooling dB A 46 49 54 Heating dB A 50 51 56 Defrost method Reverse cycle Dimensions W in 31 1 2 33 1 16 D in 11 1 4 13 H in 21 5 8 33 7 16 Weight Ib 66 77 80 119 External finish Munsell 3Y 7 8 1 1 Remote controller Wireless type Control voltage by built in transformer VDC 12 24 Re...

Page 5: ...nsion 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 thickness Liquid in 3 8 0 0315 Gas in 5 8 0 0315 Connection method Indoor F...

Page 6: ...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 4 70 60 35 33 4 At Intermediate compressor Speed Cooling rated compressor speed minimum compressor speed 3 minimum compressor speed 2 3 2 OPERATION Mode Condition Intake air temperature F Indoor Outdoor ...

Page 7: ...6 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 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 any 2 sides of left right and rear of the unit are clear Clear 1 4 OUTLINES AND DIMENSIONS OBH686 ...

Page 8: ...8 13 16 slot 1 11 32 1 9 16 Drain 3 holes ø1 5 16 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 Unit inch OBH686 ...

Page 9: ... 7 11 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 HE24NA OBH686 ...

Page 10: ...10 MUZ HE09NA MUZ HE12NA 5 WIRING DIAGRAM MUZ HE15NA OBH686 ...

Page 11: ...11 MUZ HE18NA OBH686 ...

Page 12: ...12 MUZ HE24NA OBH686 ...

Page 13: ...68 Service port Service port Muffler MUZ HE12NA MUZ HE15NA Outdoor heat exchanger Flared connection Defrost thermistor RT61 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 heating Refrigerant pipe ø3 8 HE12NA Refrigerant pipe ø1 2 HE15NA with heat insulator Refrigera...

Page 14: ...erature thermistor RT68 Ambient temperature thermistor RT65 Strainer 100 Service port Service port Unit inch MUZ HE24NA Service port Service port 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 Refrigerant flow in cooling Compress...

Page 15: ...y ft 25 30 40 50 60 65 MUZ HE09NA 1 lb 12 oz 0 1 62 4 86 8 10 11 34 12 96 MUZ HE12NA 2 lb 9 oz MUZ HE15NA 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 HE18NA 3 lb 7 oz 0 1 08 3 24 5 40 7 56 9 72 11 88 14 04 16 20 Calculation X oz 1 08 5 oz ft Refrigerant piping length ft 25 NOTE Refr...

Page 16: ...10 9 1 19 10 9 10 0 1 24 MUZ HE18NA 71 21 1 12 2 1 46 19 7 11 4 1 60 18 5 10 7 1 72 17 2 9 9 1 81 15 8 9 1 1 89 67 20 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 HE24NA 71 27 6 17 0 2 33 25 8 15 9 2 55 24 2 14 9 2 75 22 5 13 9 2 90 20 7 12 8 3 01 67 26 1 19 6 2 20 24 3 18 2 2 42 22 5 16 9 ...

Page 17: ... 63 18 1 1 65 20 5 1 72 70 8 6 0 90 11 1 1 14 13 5 1 36 15 9 1 51 18 0 1 59 18 5 1 62 21 0 1 69 65 9 0 0 86 11 3 1 10 14 1 1 31 16 5 1 47 18 5 1 55 19 1 1 57 21 4 1 65 MUZ HE24NA 75 11 7 1 27 15 4 1 60 19 3 1 88 23 0 2 10 25 9 2 20 26 7 2 24 30 3 2 32 70 12 6 1 21 16 4 1 55 20 0 1 84 23 5 2 04 26 6 2 15 27 4 2 19 31 0 2 28 65 13 3 1 16 16 8 1 48 20 9 1 77 24 3 1 99 27 4 2 10 28 2 2 13 31 7 2 24 NO...

Page 18: ...emperature F Capacity correction factors 79 75 68 64 72 Indoor intake air WB temperature F Indoor air Wet bulb temperature difference F MUZ HE24NA 71 67 63 65 75 85 95 105 115 1 3 1 5 1 7 1 9 2 1 2 3 2 5 2 7 2 9 3 1 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 HE15NA 71 67 63 65 75 85 95 105 115 0...

Page 19: ...orrection factor 59 68 79 Indoor intake air DB temperature F 0 10 20 30 40 50 60 70 0 3 0 5 0 7 0 9 1 1 Indoor intake air DB temperature F 413 CFM Airflow Outdoor intake air WB temperature F Total power consumption kW 75 70 65 75 70 65 0 10 20 30 40 50 60 70 0 4 0 5 0 6 0 7 0 8 0 9 1 0 1 1 1 2 Indoor intake air DB temperature F 413 CFM Airflow Outdoor intake air WB temperature F Total power consum...

Page 20: ... 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 HE18NA MUZ HE24NA 75 70 65 0 10 20 30 40 50 60 70 0 5 0 9 1 3 1 7 2 1 2 5 Indoor intake air DB temperature F 738 CFM Airflow Outdoor intake air WB temperature F Total power consumption kW 75 70 65 0 1...

Page 21: ... 105 F 120 140 160 180 200 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 HE18NA 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 Sucti...

Page 22: ...ure F Outdoor ambient 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 Data is based on the condition of outdoor humidity 75 Air flow should be se...

Page 23: ... 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 HE18NA 5 15 25 35 45 55 65 75 F 60 85 110 135 160 185 210 5 15 25 35 45 55 65 75 F 300 325 350 375 400 425 450 475 500 Indoor DB temperature F Condensing pres...

Page 24: ... 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 70 65 58Hz OBH686 ...

Page 25: ...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 115 103 115 116 Suction temperature F 59 39 56 35 Comp shell bottom temp F 151 149 158 158 Ref pipe length ft 25 Refrigerant charge R410A 1 lb 12 oz...

Page 26: ...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 33 Comp shell bottom temp F 148 165 164 170 Ref pipe length ft 25 Refrigerant charge R410A 2 lb 9 oz 3 lb 7 oz Indoor...

Page 27: ...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 Intake air temperature DB F 80 70 WB F 67 60 Discharge air temperature DB F 56...

Page 28: ...ompressor MUZ HE12NA 0 50 100 Hz 0 5 1 0 1 5 0 50 100 Hz 0 5 1 0 1 5 0 50 100 150 Hz 0 5 1 0 1 5 0 50 100 150 Hz 0 5 1 0 1 5 2 0 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 frequency of compressor Correction of Heating ca...

Page 29: ...ERATION starts operation frequency of compressor var ies 6 To cancel test run operation EMERGENCY OPERATION press EMERGENCY OPERATION switch or any button on remote controller 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 f...

Page 30: ...as 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 Indoor fan motor Discharge temperature thermistor Protection Indoor coil temperature thermistor Cooling Coil frost prevention Heating High pressure protec tion Defrost thermistor H...

Page 31: ...ck the following 1 Check the power supply voltage 2 Check the indoor outdoor connecting wire for miswiring 2 Take care of the following during servicing 1 Before servicing the air conditioner be sure to turn OFF the main unit first with the remote controller then after con firming the horizontal vane is closed turn off the breaker and or disconnect the power plug 2 Be sure to turn OFF the power su...

Page 32: ...tdoor abnormality Before blinking 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 ...

Page 33: ...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 34: ...n restart if discharge temperature thermistor reads 212 F 100 C or less 3 minutes later Check the refrigerant circuit and the 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 Temperature of outdoor heat exchanger temperature thermistor exceeds 158 F 70 C in COOL mode Check the refrigerant ...

Page 35: ...lligent 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 36: ...of fin temperature thermistor on the 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 the outdoor unit Check the 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 i...

Page 37: ...cases 1 Instantaneous 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 che...

Page 38: ...st 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 HE09 HE12 HE15 18 HE24 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 4 104 F 20 40 C Color of lead wire Normal Ω HE09 12 HE15...

Page 39: ...oling or heating operation 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 ...

Page 40: ...or connector 2 Output voltage of inverter P C board and balance of them See 10 5 3 Direct current voltage between DB61 and MUZ HE09 12 15 18NA JP715 and JP30 MUZ HE24NA 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 inve...

Page 41: ...k if the coil is defective Refer to 10 4 In case CN721 MUZ HE09 12 15 18 CN602 MUZ HE24 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 HE09 12 15 18 CN602 MUZ HE24 is connected Is there 208 230 VAC between CN721 MUZ HE09 12 15 18 CN602 MUZ HE24 and on the inverter P C board 3...

Page 42: ...etween each ter minal 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 volt...

Page 43: ...parts in main circuit Yes Yes No Inverter P C board Solder side DB61 260 325 VDC MUZ HE09 12 15 18NA MUZ HE24NA 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 the indoor unit ...

Page 44: ... voltage by an analog tester Properly 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 supp...

Page 45: ...ors CN931 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 HE24NA OBH686 ...

Page 46: ...e LED on the inverter P C board repeat 3 6 second OFF and 0 8 sec ond ON quick blinking 3 Yes No Lighted or not lighted Replace the inverter P C board 2 2 Be careful of the residual voltage of smoothing capacitor Is there amplitude of 10 to 20 VDC 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 w...

Page 47: ...hem No A Turn OFF the power supply Check once more if the indoor outdoor connecting wire is not miswiring Bridge the 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 and 0 8 se...

Page 48: ... strength 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...

Page 49: ...EST 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 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 Smoot...

Page 50: ... of unit Fin temperature thermistor RT64 CN642 Ambient temperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 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 15AL250...

Page 51: ...stor RT64 Resistance kΩ Resistance kΩ Resistance kΩ MUZ HE24NA Fin temperature thermistor RT64 CN673 Ambient temperature thermistor RT65 CN672 Discharge temperature thermistor RT62 CN671 Defrost thermistor RT61 CN671 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 changi...

Page 52: ...lide 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 has the locking mechanism can be detached as shown below There ...

Page 53: ...ve 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 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 53 Pho...

Page 54: ...om 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 55: ...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 55 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 of the serv...

Page 56: ...screw 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 3 ...

Page 57: ...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 58: ...alve 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 58 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 panel ...

Page 59: ...he 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 3 Rem...

Page 60: ... 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 R...

Page 61: ...61 OBH686 ...

Page 62: ... ELECTRIC CORPORATION Distributed in Feb 2014 No OBH686 Made in Japan New publication effective Feb 2014 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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