Mitsubishi Electric MUZ-FD35VA-E1 Service Manual

SERVICE MANUALCONTENTS1. TECHNICAL CHANGES ··································· 32. PART NAMES AND FUNCTIONS ····················· 43. SPECIFICATION ··

10MUZ-FD25VA MUZ-FD35VAWIRING DIAGRAM6

11MUZ-FD25VAHMUZ-FD35VAH

12MUZ-FD50VA

13Unit: mmMUZ-FD25VA MUZ-FD25VAH MUZ-FD35VA MUZ-FD35VAHOutdoorheatexchangerFlared connectionDefrostthermistorRT61DischargetemperaturethermistorRT62F

14Max. Length AMax. HeightdifferenceBIndoorunitOutdoor unitMAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCERefrigerant piping: mPi

15The standard specifications apply only to the operation of the air conditioner under normal conditions. Since operating condi-tions vary according t

NOTE: The above broken lines are for the heating operation without any frost and defrost operation.160.80.91.01.11.21.3-10-5 0 5 1015202530354045Outdo

17Correction of Cooling inputInput correction factorsThe operational frequency of compressorCorrection of Cooling capacityCapacity correction factorsT

18kgf/cm2 [Gauge]MPa [Gauge]Ambient temperature(°C) Ambient humidity(%)kgf/cm2 [Gauge]MPa [Gauge]Ambient temperature(°C) Ambient humidity(%)kgf/cm2 [G

19(A) (A)Ambient temperature(°C)Ambient temperature(°C)MUZ-FD25VA MUZ-FD25VAHMUZ-FD35VAOutdoor unit current(A)Ambient temperature(°C)MUZ-FD35VAH6.05.

2Revision A:• MUZ-FD25VAH- E2 has been added.• Power outlet has been corrected.Revision B:• MUZ-FD50VA- E1 has been added.Use the specifi ed refrigeran

2020PERFORMANCE DATA COOL operation at Rated frequencyMUZ-FD25VA MUZ-FD25VAHCAPACITY: 2.5 kW SHF: 0.85 INPUT: 485 WINDOORDB (°C)INDOORWB (°C)OUTDO

2121PERFORMANCE DATA COOL operation at Rated frequencyMUZ-FD25VA MUZ-FD25VAHCAPACITY: 2.5 kW SHF: 0.85 INPUT: 485 WINDOORDB (°C)INDOORWB (°C)OUTDO

2222PERFORMANCE DATA COOL operation at Rated frequencyMUZ-FD35VACAPACITY: 3.5 kW SHF: 0.85 INPUT: 850 WINDOORDB (°C)INDOORWB (°C)OUTDOOR DB (°C)21

2323PERFORMANCE DATA COOL operation at Rated frequencyMUZ-FD35VACAPACITY: 3.5 kW SHF: 0.85 INPUT: 850 WINDOORDB (°C)INDOORWB (°C)OUTDOOR DB (°C)35

24PERFORMANCE DATA COOL operation at Rated frequencyMUZ-FD35VAHCAPACITY: 3.5 kW SHF: 0.85 INPUT: 835 WINDOORDB (°C)INDOORWB (°C)OUTDOOR DB (°C)21 2

25PERFORMANCE DATA COOL operation at Rated frequencyMUZ-FD35VAHCAPACITY: 3.5 kW SHF: 0.85 INPUT: 835 WINDOORDB (°C)INDOORWB (°C)OUTDOOR DB (°C)35 4

26PERFORMANCE DATA COOL operation at Rated frequencyMUZ-FD50VACAPACITY: 5.0 kW SHF: 0.77 INPUT: 1500 WINDOORDB (°C)INDOORWB (°C)OUTDOOR DB (°C)21 2

27PERFORMANCE DATA COOL operation at Rated frequencyMUZ-FD50VACAPACITY: 5.0 kW SHF: 0.77 INPUT: 1500 WINDOORDB (°C)INDOORWB (°C)OUTDOOR DB (°C)35 4

2828PERFORMANCE DATA HEAT operation at Rated frequencyMUZ-FD25VA MUZ-FD25VAHCAPACITY: 3.2 kW INPUT: 610 WINDOORDB (°C)OUTDOOR WB (°C)-10 -5 0 5 10

29MUZ-FD25VA MUZ-FD25VAH MUZ-FD35VA MUZ-FD35VAH MUZ-FD50VA9-2. R.V. COIL CONTROLHeating . . . . . . . . . . . . . . . . . ON Cooling . . . . . . .

3TECHNICAL CHANGES1MUZ-FD25VA -E1MUZ-FD25VAH -E1MUZ-FD35VA -E1MUZ-FD35VAH -E1MUZ-FD50VA -E1 1. New modelMUZ-FD25VAH -E1 → MUZ-FD25VAH -E2 1. Power o

30MUZ-FD25VA MUZ-FD25VAH MUZ-FD35VA MUZ-FD35VAH MUZ-FD50VASERVICE FUNCTIONS10MUZ-FD50Sensor PurposeActuatorCompressorLEVOutdoor fan motorR.V.coilI

3111-1. CAUTIONS ON TROUBLESHOOTING1. Before troubleshooting, check the following1) Check the power supply voltage.2) Check the indoor/outdoor connect

32Outline of the functionThis air conditioner can memorize the abnormal condition which has occurred once.Even though LED indication listed on the tro

33 2. Flow chart of the detailed outdoor unit failure mode recall function 2. Blinking pattern when outdoor unit is abnormal:ONOFFNo beepBeepsRep

343. Outdoor unit failure mode tableMUZ-FD25/35POWER lamp(Indoor unit) Abnormal point (Failure mode / protection) LED indication(Outdoor P.C. board) C

35MUZ-FD50VAPOWER lamp(Indoor unit)Abnormal point(Failure mode / protection)LED indication(Outdoor P.C. board) Condition RemedyIndoor/outdoor unit fai

363611-3. TROUBLESHOOTING CHECK TABLEMUZ-FD25/35No. Symptom LED indication Abnormal point/ Condition Condition Remedy 1Outdoor unit does not op-erate

37ONOFF2.5-second OFF2.5-second OFF0.5-second ON0.5-second ONMUZ-FD50VANo. SymptomLED indicationAbnormal point/ Con-dition Condition RemedyLED1(Red)LE

38No. SymptomLED indicationAbnormal point/ Con-dition Condition RemedyLED1(Red)LED2(Yellow)20Outdoor unit operates.OnceLightingPrimary current pro-tec

393911-4. TROUBLE CRITERION OF MAIN PARTSMUZ-FD25VA MUZ-FD25VAH MUZ-FD35VA MUZ-FD35VAH MUZ-FD50VAPart name Check method and criterion FigureDefr

4Air outletDrain outletPipingDrain hoseAir inlet(back and side)MUZ-FD25VA MUZ-FD25VAH MUZ-FD35VA MUZ-FD35VAHPART NAMES AND FUNCTIONS2PipingAir outl

404011-5. TROUBLESHOOTING FLOWAre the voltages balanced?Disconnect the connector (CN61) between compressor and the intelligent power module (IPM).Repl

41 With the connector between the compressor and the intelligent power module disconnected, activate the inverter and check if the inverter is normal

42 F Check of compressor start failure D Check of compressor winding E Check of compressor operation time Disconnect the connector (CN61) between

43 G Check of outdoor thermistors H Check of R.V. coil First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to

44MUZ-FD50Heating operation does not work.•Is there voltage of 230 VAC between pin1 and pin 2 at connector CN912? YesNoDisconnect the lead wire leadin

45 I Check of outdoor fan motorIs the resistance of outdoor fan motor normal?(Refer to 11-4.)Replace the outdoor fan motor.Replace the inverter P.C.

46Is there voltage 230 VAC between the indoor terminal block S1 and S2?NoYesReplace the indoor electronic control P.C. board.Rectify indoor/outdoor co

47 K Check of LEV (Expansion valve)Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote con

48Check the outdoor fan motor. (Refer to 11-5. .)Is the fuse (F901) blown on the in-verter P.C. board?Check the connection of the connectors (CN932) o

49Turn OFF the power supply.Is there rated voltage in the power supply?YesNoTurn ON the power supply.Check the power supply.Is there rated voltage bet

5Outdoor model MUZ-FD25VA MUZ-FD25VAH MUZ-FD35VA MUZ-FD35VAHPower supply Single phase, 230 V, 50 HzCapacity Rated frequency (Min.-Max.)CoolingkW2.5

50 N Electromagnetic noise enters into TV sets or radiosYesIs the unit earthed?NoEarth the unit.YesIs the distance between the antennas and the indoo

51 O Check of defrost heaterCheck the following points before checking electric continuity.1. Does the resistance of ambient temperature thermistor h

52-20 -10 0 10 20 30 400102030405060708090100Temperature( )Defrost thermistor(RT61)Ambient temperature thermistor(RT65)Outdoor heat exchanger temper

532. Outdoor electronic control P.C. boardMUZ-FD50VA0 1020304050607080901001101207006005004003002001000Resistance (k )Temperature (°C)Discharge tempe

54MUZ-FD50VA3. Noise filter P.C. boardMUZ-FD50VA4. Outdoor power board325-370 VDCOutput(Red)(White)Connect to the compressorVoltage among phases: 5 to

5512-1. MUZ-FD25VA MUZ-FD25VAH MUZ-FD35VA MUZ-FD35VAHNOTE: Turn OFF power supply before disassembly.OPERATING PROCEDURE PHOTOS1. Removing the cabin

56OPERATING PROCEDUREPHOTOS2. Removing the inverter assembly, inverter P.C. board(1) Remove the cabinet and panels. (Refer to 1.)(2) Disconnect the le

57OPERATING PROCEDUREPHOTOS5. Removing outdoor fan motor(1) Remove the cabinet and panels. (Refer to 1.)(2) Disconnect the following connectors: <

5812-2. MUZ-FD50VANOTE: Turn OFF power supply before disassembly.OPERATING PROCEDUREPHOTOS1. Removing the cabinet(1) Remove the screws of the servic

59OPERATING PROCEDURE PHOTOS2. Removing the inverter assembly, outdoor electric control P.C. board, power board, noise filter P.C. board and reactor.(

6Outdoor model MUZ-FD50VAPower supply Single phase, 230 V, 50 HzCapacity Rated frequency (Min.-Max.)CoolingkW5.0 (1.5-5.8)Heating 5.8 (1.5-7.8)Break

60OPERATING PROCEDURE PHOTOS3. Removing the defrost thermistor, discharge tempera-ture thermistor, outdoor heat exchanger temperature thermistor and a

61OPERATING PROCEDURE PHOTOS5. Removing the compressor and 4-way valve(1) Remove the top panel, cabinet and service panel. (Refer to 1.)(2) Remove the

HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN© Copyright 2007 MITSUBISHI ELECTRIC CO.,LTDDistributed in Jul. 2011. No

7Specifi cations and rated conditions of main electric partsModel Item MUZ-FD25VA MUZ-FD25VAH MUZ-FD35VA MUZ-FD35VAHCurrent transformer(CT) 20 A(CT761,

890807060504030201063 125 250 500 1000 2000 4000 8000NC-60NC-50NC-40NC-30NC-20NC-70OCTAVE BAND SOUND PRESSURE LEVEL, 0dB re 0.0002 MICRO BARBAND CENTE

9Unit: mmMUZ-FD25VA MUZ-FD25VAH MUZ-FD35VA MUZ-FD35VAH1069800302.5500 Bolt pitch for installation15022.3Handle550280164.599.5170.523Service panelSe