Mitsubishi Electric MUZ-FD25VABH Service Manual Download Page 50

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2. Outdoor electronic control P.C. board

MUZ-FD50VABH

-20

-10

100

200

180

160

140

120

100

Resistance (k )

Temperature (°C)

Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger temperature thermistor (RT68)

Fin temperature thermistor (RT64)

100 110 120

700

600

500

400

300

200

100

Resistance (k )

Temperature (°C)

Discharge temperature thermistor (RT62)

LED 1

LED 2

CN801

325 - 370

VDC

Input

CN932

20-90V AC

GND

5V DC pulse wave

To fan

motor

Defrost thermistor (R

T61)

Discharge temperature

thermistor (R

T62)

Outdoor heat exchanger temperature thermistor (R

T68)

(+)

(–)

(+)

(–)

Rush current relay

(–)R.V

. coil

12V DC

15V

CN931

(+)

(–)

CN661

CN701 Signal transmission (T

o power board)

5V DC pulse wave

(+)

(–)

GND

CN702 Signal reception (From power board) 5V DC pulse wave

GND (power board)

CN781

CN795 12V DC pulse wave

LEV

F801

FUSE

250 V 3.15 A

Ambient temperature thermistor (R

T65)

CN663

Serial signal

5 - 10 VDC

CN601
230 VAC
Input

CN792
To relay P.C. board
Defrost heater

SW1

CN681

High

pressure

switch

(+)

(+)
(–)

CN601

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Summary of Contents for MUZ-FD25VABH

Page 1: ...0 SERVICE FUNCTIONS 25 11 TROUBLESHOOTING 26 12 DISASSEMBLY INSTRUCTIONS 53 Models SPLIT TYPE AIR CONDITIONERS MUZ FD25VABH E1 MUZ FD35VABH E1 MUZ FD50VABH E1 NOTE RoHS compliant products have G mark on the spec name plate HFC utilized R410A No OBH519 OUTDOOR UNIT Indoor unit service manual MSZ FD VA Series OBH488 PARTS CATALOG OBB519 MUZ FD25 35 Mitsubishi ilmalämpöpumput huoltaa ja korjaa Jäähdy...

Page 2: ...2 Mitsubishi ilmalämpöpumput huoltaa ja korjaa Jäähdytinpalvelu RefGroup Oy www ilmalämpöpumput com ...

Page 3: ...3 TECHNICAL CHANGES 1 MUZ FD25VABH E1 MUZ FD35VABH E1 MUZ FD50VABH E1 1 New model Mitsubishi ilmalämpöpumput huoltaa ja korjaa Jäähdytinpalvelu RefGroup Oy www ilmalämpöpumput com ...

Page 4: ...se Air inlet back and side MUZ FD25VABH MUZ FD35VABH MUZ FD50VABH Piping Air outlet Air inlet back and side Drain hose PART NAMES AND FUNCTIONS 2 Mitsubishi ilmalämpöpumput huoltaa ja korjaa Jäähdytinpalvelu RefGroup Oy www ilmalämpöpumput com ...

Page 5: ...t 1 Cooling A 0 27 0 32 0 72 Heating 0 30 0 35 Dimensions W H D mm 800 550 285 840 850 330 Weight kg 36 55 Special remarks Dehumidification Cooling h 1 4 2 0 1 7 Air flow 1 Cooling High m3 h 1 872 Med 2 940 Low 1 086 1 680 Heating High 2 016 2 940 Med 1 776 2 940 Low 1 386 2 100 Sound level 1 Cooling dB A 46 47 54 Heating 50 56 Fan speed Cooling High rpm 810 Med 800 Low 490 480 Heating High 870 80...

Page 6: ...il 21S4 AC 220 240 V Heater protector 26H Open 45 C IGBT TR821 30 A 600 V Model Item MUZ FD50VABH Current transformer CT1 CT2 20 A CT61 20 A Smoothing capacitor CB1 CB2 CB3 560 μF 450 V Fuse F64 T2 0AL250V F71 F801 T3 15AL250V Defrost heater H 230 V 130 W Expansion valve coil LEV DC 12 V Intelligent power module IPM 15 A 600 V HC930 3 A 600 V High pressure switch HPS ACB DB156 Reactor L 600 μH 20 ...

Page 7: ...AR BAND CENTER FREQUENCIES Hz COOLING FUNCTION SPL dB A LINE HEATING 47 50 Test conditions Cooling Dry bulb temperature 35 C Heating Dry bulb temperature 7 C Wet bulb temperature 6 C OUTDOOR UNIT MICROPHONE 1 m NC 10 MUZ FD35VABH 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 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL 0dB re 0 0002 MICRO BAR BAND CENTER FRE...

Page 8: ...or more 200 mm or more 100 mm or more 100 mm or more Open two sides of left right or rear side Drain hole ø33 3 0 3 5 155 90 198 40 330 360 850 430 500 80 121 840 Service panel Gas refrigerant pipe joint Refrigerant pipe flared ø12 7 Liquid refrigerant pipe joint Refrigerant pipe flared ø6 35 170 Open as a rule 500 mm or more if the front and both sides are open 100 mm or more 200 mm or more if th...

Page 9: ...9 WIRING DIAGRAM 6 MUZ FD25VABH MUZ FD35VABH Mitsubishi ilmalämpöpumput huoltaa ja korjaa Jäähdytinpalvelu RefGroup Oy www ilmalämpöpumput com ...

Page 10: ...10 MUZ FD50VABH Mitsubishi ilmalämpöpumput huoltaa ja korjaa Jäähdytinpalvelu RefGroup Oy www ilmalämpöpumput com ...

Page 11: ...at exchanger temperature thermistor RT68 Muffler MUZ FD50VABH Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve Stop valve with service port Capillary tube ø3 6 ø2 4 50 Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in heating Refrigerant pipe ø12 7 with heat insulator Refrigerant pipe ø6 35 with...

Page 12: ...25 m 30 m MUZ FD50 1 550 0 90 240 390 540 690 Calculation X g 30 g m Refrigerant piping length m 7 NOTE Refrigerant piping exceeding 7 m requires additional refrigerant charge according to the calculation Max Length A Max Height difference B Indoor unit Outdoor unit MAX REFRIGERANT PIPING LENGTH and MAX HEIGHT DIFFERENCE Refrigerant piping m Piping size O D mm Max Length A Max Height difference B ...

Page 13: ...igure 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 filter is cleaned 4 Open windows and doors of room 5 Press the EMERGENCY OPERATI...

Page 14: ...MUZ FD35VABH 26 9 24 8 22 7 20 7 18 6 16 5 14 5 12 4 10 3 8 3 MUZ FD50VABH Outdoor intake air Wet bulb temperature C 20 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 MUZ FD25VABH MUZ FD35VABH 17 3 16 0 14 6 13 3 12 0 10 6 9 3 8 0 6 ...

Page 15: ...on of Cooling capacity Capacity correction factors The operational frequency of compressor Hz The operational frequency of compressor Hz The operational frequency of compressor Hz The operational frequency of compressor Hz Correction of Cooling input Input correction factors Correction of Heating capacity Capacity correction factors MUZ FD50VABH Correction of Heating input Capacity correction fact...

Page 16: ...ulb temperature C 20 0 2 7 15 20 0 Wet bulb temperature C 14 5 1 6 12 14 5 30 70 35 Ambient temperature C Ambient humidity Ambient temperature C Ambient humidity 15 20 50 25 60 2 5 3 0 3 5 4 0 18 MUZ FD25VABH MUZ FD35VABH 15 20 50 25 60 1 8 2 0 2 2 2 4 18 A A Outdoor unit current Ambient temperature C Ambient humidity 30 70 35 MUZ FD50VABH A 4 5 5 0 5 5 6 0 6 5 15 20 25 30 35 50 60 70 kgf cm 2 Gau...

Page 17: ... 466 3 15 1 73 0 55 480 3 05 1 68 0 55 504 27 26 3 45 1 48 0 43 466 3 35 1 44 0 43 490 3 30 1 42 0 43 504 3 20 1 38 0 43 519 28 18 2 94 2 79 0 95 388 2 81 2 67 0 95 407 2 70 2 57 0 95 427 2 60 2 47 0 95 446 28 20 3 06 2 54 0 83 407 2 94 2 44 0 83 432 2 85 2 37 0 83 441 2 75 2 28 0 83 461 28 22 3 19 2 26 0 71 422 3 08 2 18 0 71 449 3 00 2 13 0 71 461 2 88 2 04 0 71 480 28 24 3 35 1 98 0 59 441 3 23...

Page 18: ... 534 2 70 1 49 0 55 558 2 55 1 40 0 55 582 27 26 3 03 1 30 0 43 553 2 85 1 23 0 43 577 2 68 1 15 0 43 601 28 18 2 45 2 33 0 95 475 2 25 2 14 0 95 504 2 08 1 97 0 95 524 28 20 2 58 2 14 0 83 495 2 40 1 99 0 83 519 2 23 1 85 0 83 548 28 22 2 73 1 93 0 71 514 2 55 1 81 0 71 543 2 38 1 69 0 71 563 28 24 2 88 1 70 0 59 534 2 70 1 59 0 59 558 2 55 1 50 0 59 582 28 26 3 03 1 42 0 47 553 2 85 1 34 0 47 57...

Page 19: ... 802 4 41 2 43 0 55 827 4 27 2 35 0 55 868 27 26 4 83 2 08 0 43 802 4 69 2 02 0 43 843 4 62 1 99 0 43 868 4 48 1 93 0 43 893 28 18 4 11 3 91 0 95 668 3 94 3 74 0 95 701 3 78 3 59 0 95 735 3 64 3 46 0 95 768 28 20 4 29 3 56 0 83 701 4 11 3 41 0 83 743 3 99 3 31 0 83 760 3 85 3 20 0 83 793 28 22 4 46 3 17 0 71 726 4 31 3 06 0 71 772 4 20 2 98 0 71 793 4 03 2 86 0 71 827 28 24 4 69 2 77 0 59 760 4 52...

Page 20: ... 3 78 2 08 0 55 960 3 57 1 96 0 55 1002 27 26 4 24 1 82 0 43 952 3 99 1 72 0 43 994 3 75 1 61 0 43 1035 28 18 3 43 3 26 0 95 818 3 15 2 99 0 95 868 2 91 2 76 0 95 902 28 20 3 61 2 99 0 83 852 3 36 2 79 0 83 893 3 12 2 59 0 83 944 28 22 3 82 2 71 0 71 885 3 57 2 53 0 71 935 3 33 2 36 0 71 969 28 24 4 03 2 37 0 59 919 3 78 2 23 0 59 960 3 57 2 11 0 59 1002 28 26 4 24 1 99 0 47 952 3 99 1 88 0 47 994...

Page 21: ... 6 30 2 96 0 47 1495 6 10 2 87 0 47 1570 27 26 6 90 2 42 0 35 1450 6 70 2 35 0 35 1525 6 60 2 31 0 35 1570 6 40 2 24 0 35 1616 28 18 5 88 5 11 0 87 1208 5 63 4 89 0 87 1268 5 40 4 70 0 87 1329 5 20 4 52 0 87 1389 28 20 6 13 4 59 0 75 1268 5 88 4 41 0 75 1344 5 70 4 28 0 75 1374 5 50 4 13 0 75 1435 28 22 6 38 4 02 0 63 1314 6 15 3 87 0 63 1397 6 00 3 78 0 63 1435 5 75 3 62 0 63 1495 28 24 6 70 3 42...

Page 22: ...1 5 40 2 54 0 47 1737 5 10 2 40 0 47 1812 27 26 6 05 2 12 0 35 1721 5 70 2 00 0 35 1797 5 35 1 87 0 35 1872 28 18 4 90 4 26 0 87 1480 4 50 3 92 0 87 1570 4 15 3 61 0 87 1631 28 20 5 15 3 86 0 75 1540 4 80 3 60 0 75 1616 4 45 3 34 0 75 1706 28 22 5 45 3 43 0 63 1601 5 10 3 21 0 63 1691 4 75 2 99 0 63 1752 28 24 5 75 2 93 0 51 1661 5 40 2 75 0 51 1737 5 10 2 60 0 51 1812 28 26 6 05 2 36 0 39 1721 5 ...

Page 23: ...6 3 04 655 3 56 739 4 08 798 4 60 848 5 08 874 5 60 890 21 2 40 588 2 88 697 3 40 773 3 88 832 4 40 874 4 88 899 5 38 932 26 2 16 630 2 68 739 3 16 815 3 68 874 4 20 916 4 68 941 5 20 966 MUZ FD50VABH CAPACITY 6 0 kW INPUT 1610 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 1047 4 56 1256 5 34 1417 6 12 1530 6 90 1626 7 62 1674 8 40 170...

Page 24: ...he compressor has stopped running 9 3 RELATION BETWEEN MAIN SENSOR AND ACTUATOR MUZ FD25 35 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 protection Defrost thermistor Cooling High pressure protection Heating Defrosti...

Page 25: ... control P C board to ON to change the defrost finish temperature Refer to 11 6 2 4th Dip Switch of SW1 Defrost finish temperature C OFF Initial setting 8 3 ON 12 2 10 2 PRE HEAT CONTROL SETTING PRE HEAT CONTROL When moisture gets into the refrigerant cycle it may interfere the start up of the compressor at low outside temperature The pre heat control prevents this interference The pre heat contro...

Page 26: ...l 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 3 Troubleshooting procedure 1 First 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 abnormality indicatio...

Page 27: ... 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 confirm 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 Release the failure ...

Page 28: ... failure mode table 11 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 defective parts The outdoor unit is normal Release the failure mode recall function accord ing to...

Page 29: ...r exceeds 70 C in COOL mode Check refrigerant circuit and refrigerant amount Check stop valve 7 time flash 2 5 seconds OFF Fin temperature P C board temperature 7 time flash 2 5 seconds OFF Temperature of fin temperature thermistor on the inverter P C board exceeds 75 80 C or temperature of P C board temperature thermistor on the inverter P C board exceeds 70 75 C Check around outdoor unit Check o...

Page 30: ... C board temperature 4 times Goes out The P C board temperature exceeds 70 C during operation 8 time flash Outdoor fan motor Lighting Lighting Failure occurs continuously three times within 30 seconds after the fan gets started Refer to 11 5 Check of outdoor fan motor 9 time flash Nonvolatile memory data Lighting 5 times Nonvolatile memory data cannot be read properly Replace the outdoor electroni...

Page 31: ...r Refer to 11 5 How to check in verter compressor 12 10 time flash 2 5 seconds OFF Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start up Refer to 11 5 Check of outdoor fan motor Refer to 11 5 Check of inverter P C board 13 12 time flash 2 5 seconds OFF Each phase current of compressor Each phase current of compressor cannot be detected nor mally Re...

Page 32: ...3 min utes later is repeated Twice Goes out lPM protection Overcurrent is detected after 30 minutes of compressor start up Reconnect compressor connector Refer to 11 5 How to check in verter compressor Check the stop valve Check the power module PAM module Lock protection Overcurrent is detected within 30 minutes of compressor start up 11 3 times Goes out Discharge tempera ture protection Discharg...

Page 33: ...ring operation Check refrigerant circuit and refrig erant amount Refer to 11 5 Check of LEV Refer to 11 5 Check of outdoor thermistors 23 4 times Lighting Low discharge tem perature protection The frequency of the compressor is kept 80 Hz or more and the discharge temperature is kept under 39 C for more than 20 minutes Refer to 11 5 Check of LEV Check refrigerant circuit and refrig erant amount 24...

Page 34: ...istor Compressor Measure the resistance between terminals using a tester Winding temperature 20 40 C Normal U V U W V W 0 78 1 11 Ω Outdoor fan motor Measure the resistance between lead wires using a tester Part temperature 20 40 C Color of lead wire Normal RED BLK BLK WHT WHT RED 11 16 Ω R V coil 21S4 Measure the resistance using a tester Part temperature 10 40 C Normal 1 19 1 78 kΩ Expansion val...

Page 35: ...esistance between terminals using a tester Winding temperature 20 40 C Normal 0 57 0 82 Ω Outdoor fan motor Measure the resistance between lead wires using a tester Part temperature 20 40 C Color of lead wire Normal RED BLK 12 17 Ω BLK WHT WHT RED R V coil Measure the resistance using a tester Part temperature 10 40 C Normal 1 15 1 71 kΩ Linear expansion valve Measure the resistance using a tester...

Page 36: ...ligent power module IPM Replace the inverter P C board Check the voltage between terminals Check the compressor See 11 5 Check of compressor No Yes See 11 5 Check of open phase A How to check inverter compressor MUZ FD25 35 Mitsubishi ilmalämpöpumput huoltaa ja korjaa Jäähdytinpalvelu RefGroup Oy www ilmalämpöpumput com ...

Page 37: ... wire of compressor and turn ON pow er supply to indoor and outdoor unit 3 minutes later starts EMERGENCY OPERATION After the compressor is heated with a drier does the compressor start 1 Refer to Judgement Replace the compressor Compressor start failure Activate pre heat control Refer to 10 2 PRE HEAT CONTROL SETTING No Yes Does the compressor run for 10 seconds or more after it starts Refer to J...

Page 38: ... 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 11 6 1 Refer to 11 5 Check of compressor operation time Does the compressor operate continuously Refer to 11 5 Check of compressor start failure OK No Yes Refer to 11 5 Check of compressor winding Is...

Page 39: ... heating Heating part Connect the compressor and activate the inverter Then measure the time until the inverter stops due to over current Operation method Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit 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...

Page 40: ...efrost 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 FD50 Thermistor Symbol Connector Pin No Board Defrost RT61 Between CN661 pin 1 and pin 2 Outdoor electronic cont...

Page 41: ...ce the noise filter P C board Yes Replace the outdoor electronic control P C board Yes Cooling operation does not work Is there voltage of 230 VAC between pin1 and pin 2 at connector CN912 Disconnect the lead wire leading to the compressor 3 minutes after turning on the power supply start EMERGENCY OPERATION in COOL mode 1 2 Turn OFF power supply of indoor and outdoor unit and disconnect the conne...

Page 42: ...tdoor electronic control P C board and measure the resistance of the outdoor fan motor 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 terminal become 5 and 0 VDC repeatedly Does the outdoor fan motor rotate smoothly Replace the outdoor fan motor Replace the outdoor electro...

Page 43: ... power module Turn ON power supply and press EMERGENCY OPERATION switch Inverter P C board Solder side DB61 280 370 VDC MUZ FD25 35 Is there voltage of 230 VAC in the power sup ply terminal block Check the connecting of parts of main power supply circuit Check the power supply cable Turn ON power supply Is the output voltage from the noise filter P C board 230 VAC Replace the noise filter P C boar...

Page 44: ...rly fix the LEV coil to the expansion valve 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 supply Preparation of the remote controller While pressing both OPERA...

Page 45: ...oor 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 Inverter P C board Solder side CN932 Yes No Yes 10 time flash No L Check of inverter P C board MUZ FD25 35 Mitsubishi ilmalämpöpumput huoltaa ja korjaa Jäähdytinpalvelu RefGroup O...

Page 46: ...ter P C board or the outdoor electronic control P C board 2 2 Be careful to the residual voltage of smoothing capacitor Turn OFF the power supply Remove the short circuit between outdoor terminal block S2 and S3 Turn ON the power supply Is there amplitude of 10 to 20 VDC between outdoor terminal block S2 and S3 Confirmation of serial signal Yes No Is there any error of the in door outdoor connecti...

Page 47: ...ific 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 air conditioner indoor outdoo...

Page 48: ...to connectors Is there 230 VAC between CN722 and on the inverter P C board or the relay P C board Refer to 11 6 1 or 2 No problem of the inverter P C board or the relay P C board Replace the inverter P C board or the relay P C board No Yes In HEAT mode for more than 5 minutes let the ambient temperature thermistor continue to read 5 C or below and let the defrost thermistor continue to read 1 C or...

Page 49: ...de of unit Fin temperature thermistor RT64 CN642 Ambient temperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 LEV connector CN724 DB61 DC 260 300 V Front side of unit AC 230 V Smoothing capacitor C62 Output to drive compressor LDU LDV LDW Fuse F701 250 V 3 15 A Smoothing capacitor C61 Smoothing capacitor C63 Fuse F901 250 V 3 15 A R V coil CN7...

Page 50: ...ED 1 LED 2 CN801 325 370 VDC Input CN932 20 90V AC GND 5V 5V DC pulse wave To fan motor Defrost thermistor RT61 Discharge temperature thermistor RT62 Outdoor heat exchanger temperature thermistor RT68 Rush current relay R V coil 12V DC 15V 15V CN931 CN661 CN701 Signal transmission To power board 5V DC pulse wave GND CN702 Signal reception From power board 5V DC pulse wave GND power board CN781 CN7...

Page 51: ...n To electronic control P C board 5 VDC pulse wave 2 5 Zero cross signal 3 4 Not used 6 5 15 V 7 5 15 V Signal reception From electronic control P C board 5 VDC pulse wave CN3 Fin temperature thermistor RT64 1 3 CN912 R V coil 230 VAC Output 230 VAC Input 230 VAC Output F64 FUSE 2 A 250 V CN902 To power board CN903 To power board CN61 230 VAC Output NR64 VARISTOR CN901 To electronic control P C bo...

Page 52: ...Relay P C board CN722 Connect to the heater 230 VAC output CN71 230 VAC input CN721 To electronic control P C board 12 VDC Mitsubishi ilmalämpöpumput huoltaa ja korjaa Jäähdytinpalvelu RefGroup Oy www ilmalämpöpumput com ...

Page 53: ...cking 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 Screw of the service panel Direction to remove Back panel Service panel Screw of the cabinet Screws of the top panel Screws of the cabinet Screws of the cabinet Screws of the top panel Hooks Terminal with locking mechanism Detaching poin...

Page 54: ... from the inverter assembly 8 Remove the inverter P C board from the relay panel Photo 3 Photo 4 Inverter assembly Photo 5 3 Removing R V coil 1 Remove the cabinet and panels Refer to 1 2 Remove the R V coil Photo 5 4 Removing the discharge temperature thermistor defrost thermistor and outdoor heat exchanger tem perature thermistor 1 Remove the cabinet and panels Refer to 1 2 Pull out the discharg...

Page 55: ...nverter assembly Refer to 2 3 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 MPa 0 kg cm2 4 Detach the welded 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 welded part of pipes connected with 4 way valve Photo 8 Welded parts of 4 way valve Prop...

Page 56: ...lve 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 Screws of the cabinet Screws of the back panel Screw of the top panel Screw of the top panel Screws of the back panel Screws of the cabinet Screw of the service panel Screw of the valve co...

Page 57: ...l 6 Remove the inverter assembly 7 Disconnect all connectors and lead wires on the electronic control P C board 8 Remove the outdoor electronic control P C board from the inverter assembly 9 Disconnect the reactor lead wire 10 Remove the screws of the reactor and remove the reactor 11 Remove the screws fixing the power board assembly 12 Disconnect all connectors and lead wires on the power board 1...

Page 58: ... the discharge temperature thermistor from its hold er Photo 8 6 Pull out the outdoor heat exchanger temperature thermistor from its holder 7 Pull out the ambient temperature thermistor from its holder Photo 5 4 Removing outdoor fan motor 1 Remove the top panel cabinet and service panel Refer to 1 2 Remove the back panel Refer to 1 3 Disconnect the following connectors Electronic control P C board...

Page 59: ...e connected with compressor 6 Remove the compressor nuts 7 Remove the compressor 8 Detach the welded part of 4 way valve and pipe Photo 7 Photo 8 6 Removing R V coil 1 Remove the top panel cabinet and service panel Refer to 1 2 Remove the back panel Refer to 1 3 Disconnect the following connectors Noise filter P C board CN912 R V coil 4 Remove the R V coil Welded parts of 4 way valve R V coil Weld...

Page 60: ...ight 2008 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Jul 2008 No OBH519 6 Made in Japan New publication effective Jul 2008 Specifications subject to change without notice Mitsubishi ilmalämpöpumput huoltaa ja korjaa Jäähdytinpalvelu RefGroup Oy www ilmalämpöpumput com ...

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Mitsubishi Electric MUZ-FD25VABH, Service Manual

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