Mitsubishi Electric MUZ-FH25VE Service Manual Download Page 31

Page: 31 / 54

No. Symptom LED

indication Abnormal point/

Condition

Condition Remedy

Outdoor unit

operates.

7-time

ash

2.5 seconds OFF

Low discharge tem-

perature protection

Temperature of discharge temperature thermistor has been

50°C or less for 20 minutes.

Refer to 11-5. "Check of LEV".

Check refrigerant circuit and refrig-

erant amount.

•

8-time

ash

2.5 seconds OFF

MUZ-FH25/35

PAM protection

PAM: Pulse Ampli-

tude Modulation

The overcurrent

ows into PFC (Power factor correction :

IC820) or the bus-bar voltage reaches 394 V or more, PAM

stops and restarts.

This is not malfunction. PAM pro-

tection will be activated in the fol-

lowing cases:

1 Instantaneous power voltage

drop. (Short time power failure)

2 When the power supply voltage

is high.

MUZ-FH50

Zero cross detecting

circuit

Zero cross signal cannot be detected.

It occurs with following cases.

1 Instantaneous power voltage

drop. (Short time power failure)

2 Distortion of primary voltage

Refer to 11-5. "Check of power

supply".

•

9-time

ash

2.5 seconds OFF

Inverter check mode The connector of compressor is disconnected, inverter check

mode starts.

Check if the connector of the com-

pressor is correctly connected.

Refer to 11-5. "How to check

inverter/compressor".

•

NOTE:

1. The location of LED is illustrated at the right

gure. Refer to 11-6.1.

2. LED is lighted during normal operation.

The

ashing frequency shows the number of times the LED blinks after every 2.5-second OFF.

(Example) When the

ashing frequency is “2”.

OFF

2.5-second OFF

0.5-second ON

LED

Flashing

→

MUZ-FH25/35VE

Inverter P.C. board

MUZ-FH50VE

LED

→

Flashing

OBH624A

Summary of Contents for MUZ-FH25VE

Page 1: ...TROL 24 10 SERVICE FUNCTIONS 25 11 TROUBLESHOOTING 26 12 DISASSEMBLY INSTRUCTIONS 47 Models SPLIT TYPE AIR CONDITIONERS NOTE RoHS compliant products have G mark on the spec name plate HFC utilized R410A No OBH624 REVISED EDITION A OUTDOOR UNIT Indoor unit service manual MSZ FH VE Series OBH623 PARTS CATALOG OBB624 MUZ FH25VE E1 MUZ FH35VE E1 MUZ FH50VE E1 Please void OBH624 Revision A MUZ FH50VE E...

Page 2: ... not touch the hot or cold areas in the refrigeration cycle When the repair or the inspection of the circuit needs to be done without turning off the power exercise great caution not to touch the live parts Use the specified refrigerant only Never use any refrigerant other than that specified Doing so may cause a burst an explosion or fire when the unit is being used serviced or disposed of Correc...

Page 3: ...GES 1 Air outlet Drain outlet Piping Drain hose Air inlet back and side MUZ FH25VE MUZ FH35VE PART NAMES AND FUNCTIONS 2 ACCESSORIES Model MUZ FH25VE MUZ FH35VE MUZ FH50VE Drain socket 1 MUZ FH50VE Piping Air outlet Drain outlet Air inlet back and side Drain hose OBH624A ...

Page 4: ...L 0 35 FV50S Fan motor Model RC0J50 CI Current 1 Cooling A 0 28 0 30 Heating 0 28 0 30 Dimensions W H D mm 800 550 285 Weight kg 37 Special remarks Dehumidification Cooling L h 0 2 0 8 Air flow 1 Cooling High m3 h 1 806 Low 1 038 Heating High 2 016 Med 1 710 Low 1 326 Sound level 1 Cooling dB A 46 49 Heating 49 50 Fan speed Cooling High rpm 810 Low 490 Heating High 900 Med 770 Low 610 Fan speed re...

Page 5: ... RC0J60 BC Current 1 Cooling A 0 83 Heating 0 84 Dimensions W H D mm 840 880 330 Weight kg 55 Special remarks Dehumidification Cooling L h 2 0 Air flow 1 Cooling High m3 h 3 006 Med 3 006 Low 1 626 Heating High 2 892 Med 2 892 Low 2 280 Sound level 1 Cooling dB A 51 Heating 54 Fan speed Cooling High rpm 840 Med 840 Low 480 Heating High 810 Med 810 Low 650 Fan speed regulator 3 Refrigerant filling ...

Page 6: ...64 PTC65 33 Ω Terminal block TB 5 P Relay X63 3 A 250 V X64 20 A 250 V X69 10A 230V R V coil 21S4 220 240 V AC Specifications and rated conditions of main electric parts Model Item MUZ FH50VE Smoothing capacitor CB1 CB2 CB3 560 μF 450 V Fuse F601 F880 F901 T3 15AL250 V IGBT module IC932 5 A 600 V IC700 20 A 600 V Expansion valve coil LEV 12 V DC Reactor L 340 μH Diode module IC820 20 A 600 V Circu...

Page 7: ...E BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz COOLING FUNCTION SPL dB A LINE HEATING 49 50 NC 10 MUZ FH35VE NOISE CRITERIA CURVES 4 Test conditions Cooling Dry bulb temperature 35 C Heating Dry bulb temperature 7 C Wet bulb temperature 6 C OUTDOOR UNIT MICROPHONE 1 m MUZ FH50VE 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC 60 NC 50 NC 40 NC 30 NC ...

Page 8: ...2 holes 10 X 21 REQUIRED SPACE 100 mm or more 350 mm or more 200 mm or more 100 mm or more 100 mm or more Drain hole ø42 Unit mm MUZ FH25VE MUZ FH35VE OUTLINES AND DIMENSIONS 5 MUZ FH50VE 417 5 40 42 Drain hole 175 500 330 50 Air in Air out 2 holes 10 21 360 840 109 81 880 452 Service panel 99 5 164 5 195 3 5 4 4 Liquid refrigerant pipe joint Refrigerant pipe flared Ø 6 35 Gas refrigerant pipe joi...

Page 9: ...9 WIRING DIAGRAM 6 MUZ FH25VE MUZ FH35VE OBH624A ...

Page 10: ...10 MUZ FH50VE OBH624A ...

Page 11: ...tube ø4 0 ø2 4 240 Outdoor heat exchanger temperature thermistor RT68 Capillary tube ø3 0 ø2 0 210 Muffler REFRIGERANT SYSTEM DIAGRAM 7 MUZ FH50VE Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve Stop valve Capillary tube ø4 0 ø2 4 100 Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in heating Re...

Page 12: ...15 12 7 6 35 ADDITIONAL REFRIGERANT CHARGE R410A g Model Outdoor unit precharged Refrigerant piping length one way 7 m 8 m 9 m 10 m 11 m 12 m 13 m 14 m 15 m 20 m MUZ FH25 35 1 150 0 30 60 90 120 150 180 210 240 390 Calculation X g 30 g m Refrigerant piping length m 7 Model Outdoor unit precharged Refrigerant piping length one way 7 m 10 m 15 m 20 m 25 m 30 m MUZ FH50 1 550 0 60 160 260 360 460 Cal...

Page 13: ... sets of wet and dry bulb thermometers to the indoor air intake as shown in the figure and at least 2 sets of wet and dry bulb thermometers to the indoor air outlet The thermometers must be attached to the position where air speed is high 2 Attach at least 2 sets of wet and dry bulb thermometers to the outdoor air intake Cover the thermometers to prevent direct rays of the sun 3 Check that the air...

Page 14: ...VE 19 8 18 3 16 8 15 2 13 7 12 2 10 7 9 1 7 6 6 1 MUZ FH35VE 26 9 24 8 22 7 20 7 18 6 16 5 14 5 12 4 10 3 8 3 MUZ FH50VE Outdoor intake air Wet bulb temperature C 15 10 5 0 5 10 15 0 4 0 5 0 6 0 7 0 8 0 9 1 0 1 1 1 2 1 3 Heating capacity at Rated frequency Capacity correction factor 15 20 26 Indoor intake air Dry bulb temperature Indoor air Dry bulb temperature difference C 15 9 14 6 13 4 12 2 11 ...

Page 15: ...ating input The operational frequency of compressor Hz Input correction factors Correction of Cooling capacity Capacity correction factors Correction of Cooling input Input correction factors Correction of Heating capacity Capacity correction factors MUZ FH50VE Correction of Heating input Capacity correction factors The operational frequency of compressor Hz The operational frequency of compressor...

Page 16: ...ed to MPa on the international system of units SI unit system The conversion factor is 1 MPa Gauge 10 2 kgf cm2 Gauge 15 20 50 25 60 30 70 35 1 5 2 0 2 5 3 0 15 20 50 25 60 30 70 35 2 5 3 0 3 5 4 0 4 5 Ambient temperature C Ambient humidity Outdoor current A Ambient temperature C Ambient humidity Outdoor current A MUZ FH35VE MUZ FH25VE Outdoor unit current 15 20 50 25 60 30 70 35 3 4 5 6 7 8 MUZ F...

Page 17: ... 480 27 24 3 35 2 18 0 65 441 3 23 2 10 0 65 466 3 15 2 05 0 65 480 3 05 1 98 0 65 504 27 26 3 45 1 83 0 53 466 3 35 1 78 0 53 490 3 30 1 75 0 53 504 3 20 1 70 0 53 519 28 18 2 94 2 94 1 00 388 2 81 2 81 1 00 407 2 70 2 70 1 00 427 2 60 2 60 1 00 446 28 20 3 06 2 85 0 93 407 2 94 2 73 0 93 432 2 85 2 65 0 93 441 2 75 2 56 0 93 461 28 22 3 19 2 58 0 81 422 3 08 2 49 0 81 449 3 00 2 43 0 81 461 2 88...

Page 18: ... 543 2 38 1 83 0 77 563 27 24 2 88 1 87 0 65 534 2 70 1 76 0 65 558 2 55 1 66 0 65 582 27 26 3 03 1 60 0 53 553 2 85 1 51 0 53 577 2 68 1 42 0 53 601 28 18 2 45 2 45 1 00 475 2 25 2 25 1 00 504 2 08 2 08 1 00 524 28 20 2 58 2 39 0 93 495 2 40 2 23 0 93 519 2 23 2 07 0 93 548 28 22 2 73 2 21 0 81 514 2 55 2 07 0 81 543 2 38 1 92 0 81 563 28 24 2 88 1 98 0 69 534 2 70 1 86 0 69 558 2 55 1 76 0 69 58...

Page 19: ... 812 27 24 4 69 2 53 0 54 746 4 52 2 44 0 54 787 4 41 2 38 0 54 812 4 27 2 31 0 54 853 27 26 4 83 2 03 0 42 787 4 69 1 97 0 42 828 4 62 1 94 0 42 853 4 48 1 88 0 42 877 28 18 4 11 3 87 0 94 656 3 94 3 70 0 94 689 3 78 3 55 0 94 722 3 64 3 42 0 94 754 28 20 4 29 3 52 0 82 689 4 11 3 37 0 82 730 3 99 3 27 0 82 746 3 85 3 16 0 82 779 28 22 4 46 3 12 0 70 713 4 31 3 01 0 70 759 4 20 2 94 0 70 779 4 03...

Page 20: ...8 3 33 2 19 0 66 951 27 24 4 03 2 17 0 54 902 3 78 2 04 0 54 943 3 57 1 93 0 54 984 27 26 4 24 1 78 0 42 935 3 99 1 68 0 42 976 3 75 1 57 0 42 1017 28 18 3 43 3 22 0 94 804 3 15 2 96 0 94 853 2 91 2 73 0 94 886 28 20 3 61 2 96 0 82 836 3 36 2 76 0 82 877 3 12 2 55 0 82 927 28 22 3 82 2 67 0 70 869 3 57 2 50 0 70 918 3 33 2 33 0 70 951 28 24 4 03 2 33 0 58 902 3 78 2 19 0 58 943 3 57 2 07 0 58 984 ...

Page 21: ...7 24 6 70 2 88 0 43 1256 6 45 2 77 0 43 1325 6 30 2 71 0 43 1366 6 10 2 62 0 43 1435 27 26 6 90 2 14 0 31 1325 6 70 2 08 0 31 1394 6 60 2 05 0 31 1435 6 40 1 98 0 31 1477 28 18 5 88 4 88 0 83 1104 5 63 4 67 0 83 1159 5 40 4 48 0 83 1214 5 20 4 32 0 83 1270 28 20 6 13 4 35 0 71 1159 5 88 4 17 0 71 1228 5 70 4 05 0 71 1256 5 50 3 91 0 71 1311 28 22 6 38 3 76 0 59 1201 6 15 3 63 0 59 1277 6 00 3 54 0...

Page 22: ...4 75 2 61 0 55 1601 27 24 5 75 2 47 0 43 1518 5 40 2 32 0 43 1587 5 10 2 19 0 43 1656 27 26 6 05 1 88 0 31 1573 5 70 1 77 0 31 1642 5 35 1 66 0 31 1711 28 18 4 90 4 07 0 83 1352 4 50 3 74 0 83 1435 4 15 3 44 0 83 1490 28 20 5 15 3 66 0 71 1408 4 80 3 41 0 71 1477 4 45 3 16 0 71 1559 28 22 5 45 3 22 0 59 1463 5 10 3 01 0 59 1546 4 75 2 80 0 59 1601 28 24 5 75 2 70 0 47 1518 5 40 2 54 0 47 1587 5 10...

Page 23: ...T Q INPUT Q INPUT Q INPUT Q INPUT 15 2 52 520 3 04 624 3 56 704 4 08 760 4 60 808 5 08 832 5 60 848 21 2 40 560 2 88 664 3 40 736 3 88 792 4 40 832 4 88 856 5 38 888 26 2 16 600 2 68 704 3 16 776 3 68 832 4 20 872 4 68 896 5 20 920 MUZ FH50VE CAPACITY 6 0 kW INPUT 1480 W INDOOR DB C OUTDOOR WB C 10 5 0 5 10 15 20 Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT 15 3 78 962 4 56 1154 5 34 13...

Page 24: ...The fan motor turns OFF 15 seconds after the compressor has stopped running 9 3 RELATION BETWEEN MAIN SENSOR AND ACTUATOR Sensor Purpose Actuator Compressor LEV Outdoor fan motor R V coil Indoor fan motor Defrost heater Discharge temperature thermistor Protection Indoor coil temperature thermistor Cooling Coil frost prevention Heating High pressure protec tion Defrost thermistor Heating Defrosting...

Page 25: ...out 50 W MUZ FH50 Prolonged low load operation in which the thermostat is OFF for a long time at low outside temperature 0 C or less may cause the following troubles To prevent those troubles activate the pre heat control 1 If moisture gets into the refrigerant cycle and freezes it may interfer the start up of the compressor 2 If liquid refrigerant collects in the compressor a failure in the compr...

Page 26: ...tor 4 When removing the electronic control P C board hold the edge of the board with care NOT to apply stress on the components 5 When connecting or disconnecting the connectors hold the housing of the connector DO NOT pull the lead wires TROUBLESHOOTING 11 3 Troubleshooting procedure 1 Check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality To ma...

Page 27: ...mality Before blinking does POWER 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 with the 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 recall function Releas...

Page 28: ... 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 The outdoor unit is normal Release the failure mode recall function accord ing to the left mentioned procedure Deleting the memorized abnormal condition After repairing the unit recall the failure mode again according to S...

Page 29: ... stops Compressor can restart if discharge temperature thermistor reads 100 C or less 3 minutes later Check refrigerant circuit and refrigerant amount Refer to 11 5 Check of LEV 6 time flash 2 5 seconds OFF High pressure Temperature indoor coil thermistor exceeds 70 C in HEAT mode Temperature defrost thermistor exceeds 70 C in COOL mode Check refrigerant circuit and refrigerant amount Check stop v...

Page 30: ...d exceeds 72 85 C FH25 35 70 75 C FH50 Check around outdoor unit Check outdoor unit air passage Refer to 11 5 Check of outdoor fan motor 10 5 time flash 2 5 seconds OFF High pressure pro tection Indoor coil thermistor exceeds 70 C in HEAT mode Defrost thermistor exceeds 70 C in COOL mode Check refrigerant circuit and refrig erant amount Check stop valve 11 8 time flash 2 5 seconds OFF Compressor s...

Page 31: ...the power supply voltage is high MUZ FH50 Zero cross detecting circuit Zero cross signal cannot be detected It occurs with following cases 1 Instantaneous power voltage drop Short time power failure 2 Distortion of primary voltage Refer to 11 5 Check of power supply 21 9 time flash 2 5 seconds OFF Inverter check mode The connector of compressor is disconnected inverter check mode starts Check if t...

Page 32: ...int diagram and voltage 1 Inverter P C board for the chart of thermistor Compressor Measure the resistance between terminals using a tester Temperature 10 40 C Normal Ω MUZ FH25 35VE MUZ FH50VE U V U W V W 1 66 2 26 0 87 1 18 Outdoor fan motor Measure the resistance between lead wires using a tester Temperature 10 40 C Color of lead wire Normal Ω MUZ FH25 35VE MUZ FH50VE RED BLK BLK WHT WHT RED 12...

Page 33: ...50 130 V The voltage may differ according to the tester Operation method Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit TEST RUN OPERA TION Refer to 8 3 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 t...

Page 34: ...nit TEST RUN OPERATION Refer to 8 3 Measurement Measure the time from the start of compressor to the stop of compressor due to overcurrent Compressor starts Abnormal IPM failure Compressor winding short Abnormal Compressor lock out Starting defect Abnormal Poor contact Outdoor P C board defect Disconnected connector Abnormal Refrigerant circuit defect Closed valve Normal 0 second 1 second 2 second...

Page 35: ...measure the resistance of thermistor MUZ FH25 35 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 MUZ FH50 Thermistor Symbo...

Page 36: ...he 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 11 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 coil Check if CN602 is connected Is there 23...

Page 37: ...easure 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 VDC 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 VDC No No Yes Disconnect the connectors CN931 and CN932 from the inverter P C board Check the connection between the ...

Page 38: ...efer to 11 6 1 No Replace the inverter P C board Is there bus bar voltage 260 370 VDC between DB61 and DB61 MUZ FH25 35 325 370 VDC between JP715 and JP30 MUZ FH50 on the inverter P C board Refer to 11 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 FH25 35 IGBT module IC700 MUZ FH50 Turn ON power supply and ...

Page 39: ...e 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 11 4 Do you hear the expansion valve click click Do you feel the expansion valve vibrate on touching it Turn ON the power sup...

Page 40: ...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 flash 10 times Replace the inverter P C board Check the corresponding parts following LED indication Refer to 11 3 Yes No Yes 10 time flash No L Check of inverter P C board OBH624A ...

Page 41: ...r electronic control P C board No Does the indoor POWER lamp blink continuously 6 minutes after the emergency operation starts No Does the outdoor LED light up Replace the indoor electronic control P C board Replace the indoor power P C board Yes Yes Does the outdoor LED blink 6 times Yes Confirm that the thermostat is OFF and wiring is not loose No Does DC 6V or more occur between indoor terminal...

Page 42: ...N Yes Turn OFF inverter controlled lighting equipment Turn OFF the power supply and then turn ON again Press EMERGENCY OPERATION switch A Is serial signal error indicated 6 minutes later B Yes Reinstall either the unit or the light away from each other Attach a filter on remote control receiving section of the indoor unit No NOTE Refer to the indoor unit service manual Replace the indoor electroni...

Page 43: ...he installation condition 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 outd...

Page 44: ...VE 11 6 TEST POINT DIAGRAM AND VOLTAGE Fin temperature thermistor RT64 CN642 Ambient temperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 DB61 260 370 VDC Front side of unit 230 VAC Smoothing capacitor C62 Output to drive compressor LDU LDV LDW Fuse F701 T3 15AL250V Smoothing capacitor C61 Fuse F901 T3 15AL250V R V coil CN721 230 VAC Jumper wi...

Page 45: ...r RT64 Resistance k Resistance k Resistance k 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 changing defrost settin...

Page 46: ...46 2 Relay P C board MUZ FH50VE To inverter P C board CN681 CN680 CN60 L68B L68A 10 VDC OBH624A ...

Page 47: ...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 Back panel Service panel Screws of the top panel Screws of the cabinet Screws of the top panel Screw of the service panel Direction to remove Screws of the cabinet Hooks Terminal with locking mechanism Detaching points The terminal whi...

Page 48: ...r to 1 2 Disconnect the following connectors Inverter P C board CN721 R V coil 3 Remove the R V coil 4 Removing the discharge temperature thermistor defrost thermistor outdoor heat exchanger tempera ture thermistor and ambient temperature thermistor 1 Remove the cabinet and panels Refer to 1 2 Disconnect the lead wire to the reactor and the following con nectors Inverter P C board CN641 Defrost th...

Page 49: ...2 Remove the inverter assembly Refer to 2 3 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 kg cm2 0 MPa 4 Detach the brazed part of the suction and the discharge pipe connected with compressor 5 Remove the nuts of compressor legs 6 Remove the compressor 7 Detach the brazed part of pipes connected with 4 way valve 49 Propeller nut Screws of...

Page 50: ...l 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 2 Photo 1 50 Screws of the cabinet Screws of the top panel Screws of the cabinet Screws of the top panel Screw of the back panel Screws of the cabinet Screws of the service panel Sc...

Page 51: ...e 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 relay panel 9 Disconnect the following connectors Relay P C board CN60 Terminal block CN680 Inverter P C board TAB65 Inverter P C board TB71 10 Remove the screws fixing the P B holder 11 Remove the relay P C board from the P B holder Photo 3 Photo 4 3 Removing R V coil 1 Remove th...

Page 52: ...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 53: ...53 OBH624A ...

Page 54: ...ributed in Mar 2013 No OBH624 REVISED EDITION A Distributed in Oct 2012 No OBH624 Made in Japan HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN New publication effective Mar 2013 Specifications are subject to change without notice ...

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