Mitsubishi MCFZ-A18WV Service Manual

SERVICE MANUALCONTENTS1. TECHNICAL CHANGES ····································22. PART NAMES AND FUNCTIONS······················53. SPECIFICATION····

10WIRING DIAGRAM6MUZ-A18YV -MUZ-A24YV -E1E1PFCGRNLD9POWER BOARDRT6521CN3REDWHTRS2RS1R64RS3RS4F801CN901NR63ELECTRONICP.C. BOARDCONTROLCB1CB2CB3HC932IPM

11MUZ-A26YV -E1PFCGRNLD9POWER BOARDRT6521CN3REDWHTRS2RS1R64RS3RS4F801CN901NR63ELECTRONICP.C. BOARDCONTROLCB1CB2CB3HC932IPMNFNOISE FILTERP.C. BOARDBLKB

12REFRIGERANT SYSTEM DIAGRAM7MUZ-A18YV -MUZ-A24YV -E1E1OUTDOOR UNITUnit:mmOutdoorheatexchangerFlared connectionDefrostthermistorRT62Dischargetempera

13Refrigerant PipingMax. length Aw Height difference should be within 15m regardless of which unit, indoor or outdoor position is high.w Ma

14PERFORMANCE CURVES8The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions.Si

1528.025.923.721.619.417.215.112.9MCFZ-A18WV - E1MUZ-A18YV - E1Rated frequency 86Hz29.927.625.323.020.718.416.113.8MCFZ-A24WV - E1MUZ-A24YV - E1Ra

16<How to operate fixed-frequency operation (Test run operation)> 1. Press the EMERGENCY OPERATION switch to COOL or HEAT mode (COOL : Press onc

17HEAT operationCondition indoor: Dry bulb temperature 20.0°CWet bulb temperature 14.5°CCondition outdoor: Dry bulb temperature 2,7,15,20.0°CWet bulb

18MSZ-A18YV - : MUZ-A18YV -E1E121 18 5.88 2.76 0.47 1248 5.63 2.64 0.47 1310 5.40 2.54 0.47 1373 5.20 2.44 0.47 143521 20 6.13 2.14 0.35 1310 5.88 2

1921 18 4.90 2.30 0.47 1529 4.50 2.12 0.47 1622 4.33 2.03 0.47 165421 20 5.15 1.80 0.35 1591 4.80 1.68 0.35 1669 4.63 1.62 0.35 171622 18 4.90 2.50 0.

21TECHNICAL CHANGESRefrigeratingoilRefrigerantNew refrigerantR410AHFC-32: HFC-125 (50%:50%)Pseudo-azeotropic refrigerantNot includedA1/A172.6-51.41.55

20PERFORMANCE DATA COOL operation Rated frequency 84HzNOTE Q : Total capacity (kW) SHF : Sensible heat factor DB : Dry-bulb temperatureSHC : Sensible

2121 18 4.70 2.21 0.47 1793 4.32 2.03 0.47 1903 4.15 1.95 0.47 194021 20 4.94 1.73 0.35 1867 4.61 1.61 0.35 1958 4.44 1.55 0.35 201322 18 4.70 2.40 0.

2221 18 7.05 3.24 0.46 1592 6.75 3.11 0.46 1672 6.48 2.98 0.46 1751 6.24 2.87 0.46 183121 20 7.35 2.50 0.34 1672 7.05 2.40 0.34 1771 6.84 2.33 0.34 18

2321 18 5.88 2.70 0.46 1950 5.40 2.48 0.46 2070 5.19 2.39 0.46 210921 20 6.18 2.10 0.34 2030 5.76 1.96 0.34 2129 5.55 1.89 0.34 218922 18 5.88 2.94 0.

2421 18 6.46 3.04 0.47 1936 6.19 2.91 0.47 2033 5.94 2.79 0.47 2130 5.72 2.69 0.47 222621 20 6.74 2.36 0.35 2033 6.46 2.26 0.35 2154 6.27 2.19 0.35 22

2521 18 5.39 2.53 0.47 2372 4.95 2.33 0.47 2517 4.76 2.24 0.47 256521 20 5.67 1.98 0.35 2468 5.28 1.85 0.35 2589 5.09 1.78 0.35 266222 18 5.39 2.75 0.

2621 18 8.34 3.75 0.45 2000 7.99 3.59 0.45 2100 7.67 3.45 0.45 2200 7.38 3.32 0.45 230021 20 8.70 2.87 0.33 2100 8.34 2.75 0.33 2225 8.09 2.67 0.33 22

2721 18 6.96 3.13 0.45 2450 6.39 2.88 0.45 2600 6.14 2.76 0.45 265021 20 7.31 2.41 0.33 2550 6.82 2.25 0.33 2675 6.57 2.17 0.33 275022 18 6.96 3.41 0.

2828PERFORMANCE DATA HEAT operationCAPACITY:5.9(kW)INPUT:1730(W)OUTDOOR WB(:)INDOOR-10 -5 0 5 10 15 20DB(:)Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT

2929ACTUATOR CONTROL9MUZ-A18YV -MUZ-A24YV -MUZ-A26YV -E1E1E1Relation between main sensor and actuator.9-3. Relation between main sensor and actuato

3-30 -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

3030103. Troubleshooting procedure1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality

31StartIndoor unit operates.Outdoor unit doesn't operate.Indoor unit doesn't receive the signal from remote controller.OPERATION INDICATORla

32IndicationAbnormal point Detecting methodSymptom: Outdoor unit does not operate.Check pointsLED 1(Red)Lighting Twice Outdoor power system When the c

33IndicationAbnormal point Detecting methodSymptom: Outdoor unit operates.Check pointsLED 1(Red)• Check the characteristic of the defrost temperature

34Part name Check method and criterionMeasure the resistance using a tester.(Part temperature : -10°C ~ 40°C)Defrost thermistor/ Outdoor heat exchange

35AACheck of power supplyOutdoor unit does not operate. (LED display: display OFF)Turn on power supply.NoYesYesNoNoYesNoYesYesNoReplace the power boar

36How to check mis-wiring and serial signal error (when outdoor unit does not work)BWhen OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-seco

37CCCheck of R.V. coilNoYesNoYesNoYesNoYesNoYesStart1. Disconnect the lead wire leading to the compressor.2. 3 minutes after turning on the power supp

38EECheck of inverter/ compressorWhen OPERATION INDICATOR lamp flashes 5-time.• When heating, room does not get warm.• When cooling, room does not get

39FFCheck of outdoor thermistors• When OPERATION INDICATOR lamp flashes 6-time.• When thermistor is abnormal. (When the LED display is a table below.)

4Electronic scale for refrigerant chargingOutdoor unitRefrigerant gas cylinderoperating valveRefrigerant gas cylinderfor R410A with siphonRefrigerant

40HHCheck of HPSInfinity0"YesNoStart1. Disconnect the connector CN681 in the electronic control P.C. board.2. Check the resistance of HPS after 1

41MUZ-A18YV - MUZ-A24YV - MUZ-A26YV -Outdoor electronic control P.C. boardE1E1E1LED 1LED 2CN601325V DC~370V DCInput(((High pressure switchCN93220-9

42MUZ-A18YV -MUZ-A24YV -MUZ-A26YV -Noise filter P.C. boardE1E1E1{R.V. coil 230V AC230V AC50HzInput230V AC50Hz Output{Power board{{CN901Electronicco

43MUZ-A18YV -MUZ-A24YV -MUZ-A26YV -Power boardE1E1E113325-370V DCOutput(Red)(White)Connect to the compressorVoltage among phases: 5V to 180VConnect

4411DISASSEMBLY INSTRUCTIONS(1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector is a terminal wit

45OPERATING PROCEDUREPHOTOS2. Removing the inverter assembly, inverter P.C. boardand power board (1) Remove the top panel, cabinet and service panel.(

465. 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) Remove th

47OPERATING PROCEDUREPHOTOSPhoto 8Welded parts of 4-way valve6. Removing the compressor and 4-way valve(1) Remove the top panel, cabinet and service p

419911310 12256781614202223242528293034812PARTS LISTMUZ-A18YV - MUZ-A24YV - MUZ-A26YV -12-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FU

49MUZ-A18YV - MUZ-A24YV - MUZ-A26YV -12-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTSE1E1E1Symbolin WiringDiagramQ't

5PART NAMES AND FUNCTIONS2OUTDOOR UNITAir inletPipingAir outlet(back and side)Drain hoseDrain outletACCESSORIES12Drain socketDrain cap [33 12MUZ-A18YV

50MUZ-A18YV -MUZ-A24YV -MUZ-A26YV -12-2. ACCESSORYE1E1E1Symbolin WiringDiagramQ'ty/unitRemarksPart No.No.Part NameMUZ-A18 YV -E1MUZ-A24 YV

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HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPANCCCopyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO.,LTDDistri

6NOTE : Test conditions are based on ISO 5151.Cooling : Indoor DB 27: WB 19:Outdoor DB 35: WB (24:)Heating : Indoor DB 20: WB 15:Outdoor DB 7: WB

7OUTDOOR UNITModelItemSmoothing capacitorCurrent transformer Current transformerFuse Fuse

8NOISE CRITERIA CURVES4COOLINGFUNCTIONSPL(dB(A)) LINEHighSPEEDHEATING535590807060504030201063 125 250 500 1000 2000 4000 8000NC-60NC-50NC-40NC-30NC-20

95OUTLINES AND DIMENSIONSUnit: mmOUTDOOR UNITMUZ-A18YV -MUZ-A24YV -MUZ-A26YV -E1E1E130-35-155901984051529966345133036085043050080121840Open as a ru