Mitsubishi MSZ-GA50 VA Service Manual

SERVICE MANUALCONTENTS1. TECHNICAL CHANGES ····································32. PART NAMES AND FUNCTIONS······················63. SPECIFICATION····

10MUZ-GA60VA -E3OB389F--1qxp 07.9.3 5:07 PM Page 10

11MUZ-GA71VABLKCN90212CN90312TAB4X64 3R64A R64BRED2314LYLWYLWRED230V~12-24VCN912CN663WHTBLUNOISEFILTERP.C.BOARDBRNTO INDOORUNITCONNECTINGREDS3RT6521CN

12REFRIGERANT SYSTEM DIAGRAM7MUZ-GA50VAMUZ-GA60VA -E1Unit:mmOutdoorheatexchangerFlared connectionDefrostthermistorRT61DischargetemperaturethermistorRT

13MUZ-GA71VAUnit:mmOutdoorheatexchangerFlared connectionDefrostthermistorRT61DischargetemperaturethermistorRT62Flared connectionStop valveStop valve(w

14Refrigerant PipingMax. length AMax. Heightdifference BIndoorunitOutdoor unitMAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCEMode

15PERFORMANCE CURVES8The standard specifications apply only to the operation of the air conditioner under normal conditions. Since operating condi-tio

16MUZ-GA71VACapacity correction factorsInput correction factorsInput correction factorsCapacity correction factorsCorrection of Cooling capacityThe op

17NOTE : The unit of pressure has been changed to MPa on the international system of units (SI unit system).The conversion factor is: 1(MPa [Gauge]) =

18Outdoor unit current (A)Outdoor unit current (A)Ambient temperature(˚C)Ambient temperature(˚C)Outdoor unit current (A)Ambient temperature(˚C)MUZ-GA7

19MSZ-GA50VA : MUZ-GA50VAINDOOR INDOORCAPACITY:5.0(kW)INPUT:1460(W)SHF:0.6521OUTDOOR DB(:)25 27 30WB(:)Q SHC SHF Q SHC SHF Q SHC SHF Q SHC SHFINPUT

Revision A :• RoHS PARTS LIST has been added.• Failure mode recall function(11-2.) has been changed.• Check of HPS(11-6.H) has been corrected.Revision

20INDOOR INDOORCAPACITY:5.0(kW)INPUT:1460(W)SHF:0.6535OUTDOOR DB(:)40 43 46WB(:)Q SHC SHF Q SHC SHF Q SHC SHF Q SHC SHFINPUT INPUT INPUT INPUTDB(:)

21PERFORMANCE DATA COOL operation at Rated frequencyNOTE Q : Total capacity (kW) SHF : Sensible heat factor DB : Dry-bulb temperatureSHC : Sensible he

22INDOOR INDOORCAPACITY:6.0(kW)INPUT:1930(W)SHF:0.6435OUTDOOR DB(:)40 43 46WB(:)Q SHC SHF Q SHC SHF Q SHC SHF Q SHC SHFINPUT INPUT INPUT INPUTDB(:)

23INDOOR INDOORCAPACITY:7.1(kW)INPUT:2420(W)SHF:0.6321OUTDOOR DB(:)25 27 30WB(:)Q SHC SHF Q SHC SHF Q SHC SHF Q SHC SHFINPUT INPUT INPUT INPUTDB(:)

24INDOOR INDOORCAPACITY:7.1(kW)INPUT:2420(W)SHF:0.6335OUTDOOR DB(:)40 43 46WB(:)Q SHC SHF Q SHC SHF Q SHC SHF Q SHC SHFINPUT INPUT INPUT INPUTDB(:)

25PERFORMANCE DATA HEAT operation at Rated frequencyNOTE Q : Total capacity (kW) INPUT : Total power input (W) DB : Dry-bulb temperature WB : We

269ACTUATOR CONTROLMUZ-GA50VAMUZ-GA60VAMUZ-GA71VARelation between main sensor and actuator.9-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR9-2. R.V. COI

27SERVICE FUNCTIONS10TROUBLESHOOTING113. Troubleshooting procedure1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on an

28Outline of the functionThis air conditioner can memorize the abnormal condition which has occurred once.Even though LED indication listed on the tro

292. Flow chart of the detailed outdoor unit failure mode recall functionOperational procedureNOTE1. Make sure to release the failure mode recall func

31TECHNICAL CHANGESRefrigerationoilRefrigerantNew refrigerantR410AHFC-32: HFC-125 (50%:50%)Pseudo-azeotropic refrigerantNot includedA1/A172.6-51.41.55

303. Outdoor failure mode tableOFF None (Normal)2-time flash3-time flash4-time flash5-time flash6-time flash7-time flash8-time flashLighting LightingL

3111-time flash• Check the connecting wire between outdoor electronic control P.C. board and power board.• Replace the power board.• Check t

3211-3. INSTRUCTION OF TROUBLESHOOTINGStartIndoor unit operates.Outdoor unit doesn't operate.Indoor unit doesn't receive the signal from re

3311-4. TROUBLESHOOTING CHECK TABLE LED1(Red) LED2(Yellow)Lightning Twice Outdoor power system• Check the connection of the compressor connecting wir

34Primary current protectionSecondary current protectionHigh-pressure protectionDefrosting in cooling3 timesLightingDischarge temperatureprotection• C

35MUZ-GA50VAMUZ-GA60VAMUZ-GA71VA11-5. TROUBLE CRITERION OF MAIN PARTSPart name FigureCheck method and criterionDefrost thermistor(RT61)Ambient tempera

36AACheck of power supplyOutdoor unit does not operate. 11-6. TROUBLESHOOTING FLOWTurn ON power supply.NoYesYesNoNoYesNoYesYesNoReplace the power boar

37How to check mis-wiring and serial signal error (when outdoor unit does not work)B• When unit cannot operate neither by the remote controller nor by

38CCCheck of R.V. coilNoYesNoYesNoYesNoYesNoYes1. Disconnect the lead wire leading to the compressor.2. 3 minutes after turning ON the power supply, s

39When OPERATION INDICATOR lamp flashes 5-time.• When heating, room does not get warm.• When cooling, room does not get cool.DDCheck of LEVNoYesNoYesT

4-30 -20 -10 0 10 203040 50 60-0.50.00.51.01.52.02.53.03.54.0(MPa [Gauge])R410AR22Conversion chart of refrigerant temperature and pressureSaturated li

40GGCheck of outdoor fan motor• Fan motor does not operate or stops operating shortly after starting the operation.FFCheck of outdoor thermistors• Whe

41HHCheck of HPS• When the operation frequency does not go up from lowest frequency.MUZ-GA60VA-MUZ-GA71VAE3Infinity0"NoYes1. Disconnect the conne

42Electromagnetic noise enters into TV sets or radiosIReplace or repair the antenna.Replace or repair the coaxial cable.NoNoNoYesYesNoNoYesYesYesIs th

4311-7. TEST POINT DIAGRAM AND VOLTAGE1. Outdoor electronic control P.C. boardMUZ-GA50VA MUZ-GA60VA MUZ-GA71VALED 1LED 2CN801325V DC~370V DCInput((CN9

44{CN912R.V. coil 230V AC230V ACInput230V ACOutput{{CN901To electroniccontrol P.C. boardMUZ-GA50VAMUZ-GA60VAMUZ-GA71VAF64 FUSE250V 2AF911 FUSE250V 1A2

45MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA3. Outdoor power board325-370V DCOutput(Red)(White)Connect to the compressorVoltage among phases: 5V to180VConnect t

4612DISASSEMBLY INSTRUCTIONS(1) Slide the sleeve and check if there is a locking lever or not.(2) The terminal with this connector has the lock

47OPERATING PROCEDUREPHOTOS2. Removing the inverter assembly, inverter P.C. boardand power board (1) Remove the top panel, cabinet and service panel.(

485. 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) Disconnec

49OPERATING PROCEDUREPHOTOSPhoto 8Welded parts of 4-way valve6. Removing the compressor and 4-way valve(1) Remove the top panel, cabinet and service p

5Electronic scale for refrigerant chargingOutdoor unitRefrigerant gas cylinderoperating valveRefrigerant gas cylinderfor R410A with siphonRefrigerant

50419911310 122567816142022232425293031313PARTS LIST (non-RoHS compliant)MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA13-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRIC

51MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA13-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTSSymbolin WiringDiagramQ'ty/unitRemark

52MUZ-GA50VAMUZ-GA60VAMUZ-GA71VA13-2. ACCESSORYSymbolin WiringDiagramQ'ty/unitRemarksPart No.No.Part NameMUZ-GA50 VA -E1MUZ-GA60 VA -E1MUZ-GA71

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54419911310 122567816142022232425293031314RoHS PARTS LIST (RoHS compliant)MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA14-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRI

55MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA14-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTSSymbolin WiringDiagramQ'ty/unitRemark

MUZ-GA50VAMUZ-GA60VAMUZ-GA71VA14-2. ACCESSORYSymbolin WiringDiagramQ'ty/unitRemarksPart No.No.RoHSPart NameMUZ-GA50 VA -E1MUZ-GA60 VA -MUZ-GA71

6PART NAMES AND FUNCTIONS2Air inletPipingAir outlet(back and side)Drain hoseDrain outletACCESSORIES12Drain socketDrain cap [33 12E1E2E3Single phase230

7NOISE CRITERIA CURVES490807060504030201063 125 250 500 1000 2000 4000 8000NC-60NC-50NC-40NC-30NC-20NC-70BAND CENTER FREQUENCIES, HzAPPROXIMATETHRESHO

85OUTLINES AND DIMENSIONSUnit: mmMUZ-GA50VAMUZ-GA60VAMUZ-GA71VA30-35-155901984051529966345133036085043050080121840Open as a rule500 mm or more ifthe f

9WIRING DIAGRAM6MUZ-GA50VAMUZ-GA60VA -MUZ-GA60VA -E2E1R64BYLW230V~12-24VCN912CN663WHTBLUNOISEFILTERP.C.BOARDBRNTO INDOORUNITCONNECTINGREDS3RT6521CN611