Mitsubishi Electric MUZ-FH35VEHZ Manuale di Servizio

SERVICE MANUALCONTENTS1. TECHNICAL CHANGES ··································· 32. PART NAMES AND FUNCTIONS ····················· 33. SPECIFICATION ··

10MUZ-FH50VEHZOBH625A

11Unit: mmMUZ-FH25VEHZMUZ-FH35VEHZ OutdoorheatexchangerFlared connectionDefrostthermistorRT61DischargetemperaturethermistorRT62Flared connectionStop

12Max. Length AMax. HeightdifferenceBIndoorunitOutdoor unitMAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFEFRENCEModelRefrigerant piping

13The standard specifications apply only to the operation of the air conditioner under normal conditions. Since operating condi-tions vary according t

14NOTE: The above broken lines are for the heating operation without any frost and defrost operation.0.80.91.01.11.21.3-10-5 0 5 1015202530354045Outdo

158-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR0 50 1000.51.01.50 50 1000.51.01.52.00 50 1000.51.01.52.00 50 1001230501001

1615 20 25 30 350.40.50.60.70.80.915 20 25 30 350.40.50.60.70.8Ambient temperature(°C)Ambient humidity(%)15 20 25 30 350.30.40.50.60.70.8(kgf/cm2[Gaug

17PERFORMANCE DATA COOL operation at Rated frequencyMUZ-FH25VEHZCAPACITY: 2.5 kW SHF: 0.95 INPUT: 485 WINDOORDB (°C)INDOORWB (°C)OUTDOOR DB (°C)21

18PERFORMANCE DATA COOL operation at Rated frequencyMUZ-FH25VEHZCAPACITY: 2.5 kW SHF: 0.95 INPUT: 485 WINDOORDB (°C)INDOORWB (°C)OUTDOOR DB (°C)35

19PERFORMANCE DATA COOL operation at Rated frequencyMUZ-FH35VEHZCAPACITY: 3.5 kW SHF: 0.84 INPUT: 820 WINDOORDB (°C)INDOORWB (°C)OUTDOOR DB (°C)21

2<Preparation before the repair service> Prepare the proper tools. Prepare the proper protectors. Provide adequate ventilation. After stoppi

20PERFORMANCE DATA COOL operation at Rated frequencyMUZ-FH35VEHZ CAPACITY: 3.5 kW SHF: 0.84 INPUT: 820 WINDOORDB (°C)INDOORWB (°C)OUTDOOR DB (°C)3

21PERFORMANCE DATA COOL operation at Rated frequencyMUZ-FH50VEHZCAPACITY: 5.0 kW SHF: 0.73 INPUT: 1380 WINDOORDB (°C)INDOORWB (°C)OUTDOOR DB (°C)2

22PERFORMANCE DATA COOL operation at Rated frequencyMUZ-FH50VEHZCAPACITY: 5.0 kW SHF: 0.73 INPUT: 1380 WINDOORDB (°C)INDOORWB (°C)OUTDOOR DB (°C)3

23PERFORMANCE DATA HEAT operation at Rated frequencyMUZ-FH25VEHZCAPACITY: 3.2 kW INPUT: 580 WINDOORDB (°C)OUTDOOR WB (°C)-10 -5 0 5 10 15 20Q INPUT

24MUZ-FH25VEHZMUZ-FH35VEHZMUZ-FH50VEHZ9-2. R.V. COIL CONTROLHeating . . . . . . . . . . . . . . . . . ON Cooling . . . . . . . . . . . . . . . . . OFF

2510-1. CHANGE IN DEFROST SETTING Changing defrost finish temperature <JS> To change the defrost finish temperature, cut/solder the JS wire of

2611-1. CAUTIONS ON TROUBLESHOOTING1. Before troubleshooting, check the following1) Check the power supply voltage.2) Check the indoor/outdoor connect

27Outline of the functionThis air conditioner can memorize the abnormal condition which has occurred once.Even though LED indication listed on the tro

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

293. Outdoor unit failure mode tablePOWER lamp(Indoor unit) Abnormal point (Failure mode/protection) LED indication(Outdoor P.C. board) Condition Reme

3MUZ-FH25VEHZ -E1MUZ-FH35VEHZ -E1MUZ-FH50VEHZ -E1 1. New modelTECHNICAL CHANGES1Air outletDrain outletPipingDrain hoseAir inlet(back and side)MUZ-FH2

3011-3. TROUBLESHOOTING CHECK TABLENo. Symptom LED indication Abnormal point/ Condition Condition Remedy 1Outdoor unit does not op-erate. 1-time fl as

31No. Symptom LED indication Abnormal point/ Condition Condition Remedy 19Outdoor unit operates. 7-time fl ash 2.5 seconds OFFLow discharge tem-peratu

3211-4. TROUBLE CRITERION OF MAIN PARTSMUZ-FH25VEHZMUZ-FH35VEHZMUZ-FH50VEHZPart name Check method and criterion FigureDefrost thermistor (RT61) Fin

3311-5. TROUBLESHOOTING FLOWAre the voltages balanced?Disconnect the connector between the compressor and the power module (IC700) (MUZ-FH25/35)/IGBT

34 F Check of compressor start failure D Check of compressor winding E Check of compressor operation time●Disconnect the connector between the comp

35 G Check of outdoor thermistorsMUZ-FH25/35Thermistor Symbol Connector, Pin No. Board Defrost RT61 Between CN641 pin1 and pin2 Inverter P.C. boar

36 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 11-4. In case CN721 is disconne

37 I Check of outdoor fan motorIs the resistance between each ter-minal of outdoor fan motor normal? (Refer to 11-4.)Disconnect CN932 from the invert

38 J Check of power supplyIs there voltage 230 VAC between the indoor terminal block S1 and S2?NoYesReplace the indoor electronic control P.C. board.

39Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor

4Outdoor model MUZ-FH25VEHZ MUZ-FH35VEHZPower supply Single phase, 230 V, 50 HzCapacity Rated frequency (Min.-Max.)CoolingkW2.5 (0.8 - 3.5) 3.5 (0.8

40Check 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 (CN931, C

41 M How to check miswiring and serial signal errorTurn OFF inverter-controlled lighting equipment.Turn OFF the power supply and then turn ON again.P

42MUZ-FH50Turn the power supply OFF.Is there rated voltage in the power supply?YesNoCheck for incorrect indoor-outdoor connecting wiring.Check the pow

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

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

45-20 -10 0 10 20 30 400102030405060708090100Temperature( )Defrost thermistor(RT61)Ambient temperature thermistor(RT65)Outdoor heat exchanger temper

46MUZ-FH50VEHZ-20 -10 0 10 20 30 400102030405060708090100Temperature( )Defrost thermistor(RT61)Ambient temperature thermistor(RT65)Outdoor heat exch

472. Relay P.C. boardMUZ-FH50VEHZTo inverter P.C. board CN681 (CN680)CN60L68B(-)L68A(+)10 VDCOBH625A

4812-1. MUZ-FH25VEHZ MUZ-FH35VEHZNOTE: Turn OFF power supply before disassembly.OPERATING PROCEDURE PHOTOS1. Removing the cabinet(1) Remove the screw

49OPERATING PROCEDUREPHOTOS2. Removing the inverter assembly, inverter P.C. board(1) Remove the cabinet and panels. (Refer to 1.)(2) Disconnect the le

5Outdoor model MUZ-FH50VEHZPower supply Single phase, 230 V, 50 HzCapacity Rated frequency (Min. - Max.)CoolingkW5.0 (1.9 - 6.0)Heating 6.0 (1.7 - 8

50OPERATING PROCEDUREPHOTOS5. Removing outdoor fan motor(1) Remove the cabinet and panels. (Refer to 1.)(2) Disconnect the following connectors: <

12-2. MUZ-FH50VEHZ NOTE: Turn OFF power supply before disassembly.OPERATING PROCEDUREPHOTOS1. Removing the cabinet(1) Remove the screws of the

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

OPERATING PROCEDURE PHOTOS4. Removing the discharge temperature thermistor, defrost thermistor, outdoor heat exchanger tempera-ture thermistor and amb

© Copyright 2012 MITSUBISHI ELECTRIC CORPORATIONDistributed in Mar. 2013. No. OBH625 REVISED EDITION-ADistributed in Jul. 2012. No. OBH625 Made in Ja

6Specifi cations and rated conditions of main electric partsModel Item MUZ-FH25VEHZ MUZ-FH35VEHZSmoothing capacitor(C61, C62) 600 μF/ 620 μF 420 VDiod

790807060504030201063 125 250 500 1000 2000 4000 8000NC-60NC-50NC-40NC-30NC-20NC-70OCTAVE BAND SOUND PRESSURE LEVEL, 0dB re 0.0002 MICRO BARBAND CENTE

8Unit: mmMUZ-FH25VEHZMUZ-FH35VEHZ1069800302.5500 Bolt pitch for installation15022.3Handle550280164.599.5170.523Service panelService port285344.544400A

9WIRING DIAGRAM6MUZ-FH25VEHZ MUZ-FH35VEHZOBH625A