Mitsubishi Electric MSC-A07WV-E1 Service Manual
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Mitsubishi Electric MSC-A07WV-E1 Service Manual

Mitsubishi Electric MSC-A07WV-E1 Service Manual

Split-type, air conditioners; split-type, heat pump air conditioners
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SPLIT-TYPE, AIR CONDITIONERS
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SERVICE MANUAL
Wireless type
Models
MSC-A07WV -
MSC-A09WV -
MSC-A12WV -
MSC-A07WV -
MSC-A09WV -
MSC-A12WV -
Multi system type
Models
MSC-A07WV -
MSC-A09WV -
MSC-A12WV -
Inverter-controlled multi system Model
MSC-A07WV -
E1
MSC-A09WV -
E1
MSC-A12WV -
E1
Remote
controller
All manuals and user guides at all-guides.com
· MU-A07WV -
E1
( WH )
· MU-A09WV -
E1
( WH )
· MU-A12WV -
E1
( WH )
· MUH-A07WV -
( WH )
E1
· MUH-A09WV -
E1
( WH )
· MUH-A12WV -
E1
( WH )
· MUX-A10WV -
E1
( WH )
· MUX-A19WV -
E1
( WH )
· MUX-A20WV -
E1
( WH )
· MUX-A25WV -
· MUX-A26WV -
· MXZ-A18WV -
CONTENTS
Indication of
model name
10. PERFORMANCE CURVES ······························45
11. MICROPROCESSOR CONTROL·····················84
12. SERVICE FUNCTIONS···································102
13. TROUBLESHOOTING····································104
14. DISASSEMBLY INSTRUCTIONS···················129
15. PARTS LIST····················································144
16. OPTIONAL PARTS·········································157
Revision:
MXZ-A18WV -
E1
MSC-A07/09/12WV -
VARISTOR (NR11& NR12)
E02 336 385
E02 749 385
Please void OB307.
HFC
utilized
R410A
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················6
CORRESPONDENCE TABLE ···························8
4. INDOOR UNITS COMBINATION ·······················9
5. SPECIFICATION···············································10
6. NOISE CRITERIA CURVES ···························· 17
7. OUTLINES AND DIMENSIONS ······················ 20
8. WIRING DIAGRAM ··········································25
9. REFRIGERANT SYSTEM DIAGRAM ··············32
have been added.
Part No. . have changed.
E1
No. OB307
REVISED EDITION-A
E1
E1
E1
E1
E1
E1
E1
E1
E1
E1
E1
E1

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Summary of Contents for Mitsubishi Electric MSC-A07WV-E1

  • Page 1: Table Of Contents

    All manuals and user guides at all-guides.com Revision: MXZ-A18WV - have been added. Part No. . have changed. MSC-A07/09/12WV - VARISTOR (NR11& NR12) SPLIT-TYPE, AIR CONDITIONERS E02 336 385 E02 749 385 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS Please void OB307. No.

  • Page 2: Technical Changes

    All manuals and user guides at all-guides.com TECHNICAL CHANGES MSC-07RV- MSC-A07WV- MSC-09RV- MSC-A09WV- MSC-12RV- MSC-A12WV- 1. Rated voltage has changed. (220-240V 230V) 2. Indoor model has changed. MU-07RV- MU-A07WV- 1. Refrigerant has changed. (R22 R410A) 2. Compressor has changed. (RH130VGCT RN092VHSHT) MU-09RV- MU-A09WV- 1.
  • Page 3 All manuals and user guides at all-guides.com INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT • This room air conditioner adopts an HFC refrigerant (R410A) which never destroys the ozone layer. • Pay particular attention to the following points, though the basic installation procedure is same as that for R22 conditioners. 1 As R410A has working pressure approximate 1.6 times as high as that of R22, some special tools and piping parts/ materials are required.
  • Page 4 All manuals and user guides at all-guides.com Conversion chart of refrigerant temperature and pressure (MPa [Gauge]) R410A NOTE : 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]) =10.2(kgf/f f [Gauge]) -0.5 -30 -20 -10...
  • Page 5 All manuals and user guides at all-guides.com 2 Flaring work and flare nut Flaring work for R410A pipe differs from that for R22 pipe. For details of flaring work, refer to Installation manual “FLARING WORK”. Dimension of flare nut Pipe diameter R410A 6.35 9.52...

  • Page 6: Part Names And Functions

    All manuals and user guides at all-guides.com PART NAMES AND FUNCTIONS INDOOR UNIT MSC-A07WV - MSC-A09WV - MSC-A12WV - Front panel Air cleaning filter (White bellows type) Air inlet Deodorizing filter to Breaker (Gray sponge type) Power supply cord Panel Air filter Remote control receiving section...
  • Page 7 All manuals and user guides at all-guides.com OUTDOOR UNIT MUX-A19WV- MUX-A25WV- MUX-A26WV- MUX-A20WV- Air inlet Air inlet (Back and side) (Back and side) Air outlet Air outlet Piping Piping Drainage hose Drainage hose Drain outlet Drain outlet MXZ-A18WV- Air inlet (Back and side) Air outlet Drain outlet...

  • Page 8: Indoor/Outdoor

    All manuals and user guides at all-guides.com REMOTE CONTROLLER Signal transmitting section Operation display section OPERATE /STOP (ON /OFF)button ON/OFF WARM COOL TEMPERATURE buttons Open the front lid. CLOCK ON/OFF WARM COOL FAN SPEED CONTROL button STOP OFF-TIMER button I FEEL COOL VANE START HEAT...

  • Page 9: Indoor Units Combination

    All manuals and user guides at all-guides.com MXZ-A18WV - OUTDOOR UNIT MXZ-A18WV- 07+07 07+09 07+12 09+09 09+12 12+12 There is no combination other than this table. INDOOR UNITS COMBINATION MXZ-A18WV - NOTE: Electrical data is for outdoor unit only. Cooling capacity (kW) Outdoor unit Current Power...

  • Page 10: Specification

    All manuals and user guides at all-guides.com SPECIFICATION Indoor model MSC-A07WV - MSC-A09WV - MSC-A12WV - Cooling Cooling Cooling Function Single phase Single phase Single phase Indoor unit power supply 230V,50Hz 230V,50Hz 230V,50Hz 474/372 /276 474/384 /306 Capacity Air flow(High/Med. /Low ) K /h 582/444 /324 Power outlet...
  • Page 11 All manuals and user guides at all-guides.com Indoor model MSC-A07WV - MSC-A09WV - MSC-A12WV - Cooling Heating Cooling Heating Cooling Heating Function Single phase Single phase Single phase Indoor unit power supply 230V,50Hz 230V,50Hz 230V,50Hz Capacity Air flow(High/Med. /Low ) K /h 474/372 /276 510/420 /342...
  • Page 12 All manuals and user guides at all-guides.com MSC-A07WV - MSC-A07WV - MSC-A12WV - Indoor model Cooling Cooling Cooling Function Single phase Single phase Single phase Indoor unit power supply 230V,50Hz 230V,50Hz 230V,50Hz Air flow (High/Med./Low) K /h 474/372 /276 474/372 /276 582/444 /324 Capacity Power outlet...
  • Page 13 All manuals and user guides at all-guides.com Indoor model MSC-A09WV - Cooling Function Single phase Indoor unit power supply 230V,50Hz 474/384 /306 Air flow (High/Med./Low) K /h Capacity Power outlet 0.17 Running current Power input Power factor — Starting current 0.17 Fan motor current RC4V19-LA...
  • Page 14 All manuals and user guides at all-guides.com (Unit A ,B) Indoor model MSC-A12WV - Cooling Function Single phase 230V,50Hz Indoor unit power supply 582/444 /324 Air flow (High/Med./Low) K /h Capacity Power outlet 0.19 Running current Power input Power factor —...
  • Page 15 All manuals and user guides at all-guides.com (Unit C ,D) (Unit A ,B) Indoor model MSC-A09WV - MSC-A12WV - Cooling Cooling Function Indoor unit power supply Single phase 230V,50Hz Single phase 230V,50Hz Capacity Air flow (High/Med./Low) K /h 474/384 /306 582/444 /324 Power outlet 0.17...
  • Page 16 All manuals and user guides at all-guides.com MXZ-A18WV - Outdoor model Single phase Outdoor unit power supply 230V,50Hz Indoor units number Total model name 24 Indoor units total capacity (Connectable) Total model name 24 indoor units total capacity (Simultaneous operation) Max.

  • Page 17: Noise Criteria Curves

    All manuals and user guides at all-guides.com NOISE CRITERIA CURVES MSC-A09WV- MSC-A07WV- SPL(dB LINE FAN SPEED FUNCTION SPL(dB LINE FAN SPEED FUNCTION COOL COOL High High HEAT HEAT Test conditions. Test conditions, Cooling : DB27: WB19: Cooling : DB27: WB19: Heating : DB20: WB -: Heating : DB20:...
  • Page 18 All manuals and user guides at all-guides.com MU-A12WV- MUH-A07WV- SPL(dB LINE FUNCTION FUNCTION SPL(dB LINE COOL COOL HEAT Test conditions, Test conditions, Cooling :DB35: WB24: Cooling :DB35: WB24: Heating :DB 7: WB 6: NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30...
  • Page 19 All manuals and user guides at all-guides.com MUX-A19WV - MUX-A26WV - SPL(dB LINE FUNCTION SPL(dB LINE FUNCTION MUX-A20WV - COOL COOL MUX-A25WV - Test conditions. Test conditions. Cooling :DB35: WB24: Cooling :DB35: WB24: NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30...

  • Page 20: Outlines And Dimensions

    All manuals and user guides at all-guides.com OUTLINES AND DIMENSIONS Unit: mm MSC-A07WV - 81.5 133.5 MSC-A09WV - Installation plate INDOOR UNIT Indoor unit 81.5 81.5 Wall hole Installation plate Liquid line 6.35-0.5m Gas line 9.52-0.43m Insulation 37 O.D Air in 21 I.D Drain hose (Connected part O,D)
  • Page 21 All manuals and user guides at all-guides.com Unit: mm MU-A07WV - MUH-A07WV - REQUIRED SPACE MU-A09WV - MUH-A09WV - MU-A12WV - MUH-A12WV - OUTDOOR UNIT Air in Air in Drainage 3holes [33 Air out Service panel Liquid refrigerant pipe joint Refrigerant pipe (flared) [6.35 Gas refrigerant...
  • Page 22 All manuals and user guides at all-guides.com Unit: mm OUTDOOR UNIT REQUIRED SPACE MUX-A10WV- Air in Air in Drainage 3holes [33 Air out Service panel Liquid refrigerant pipe joint Refrigerant pipe (flared) [6.35 Gas refrigerant pipe joint Refrigerant pipe (flared) [9.52 MUX-A19WV- Open as a rule 500mm or more if...
  • Page 23 All manuals and user guides at all-guides.com Unit: mm OUTDOOR UNIT Open as a rule MUX-A20WV- 500mm or more if the front and both sides are open 100mm or more 200mm or more if 100mm or more Drainage there are obstacles 3holes {33 Air in to both sides...
  • Page 24 All manuals and user guides at all-guides.com Unit: mm OUTDOOR UNIT Open as a rule 500mm or more if the front and both MUX-A26WV- sides are open 100mm or more 200mm or more if Drainage 100mm or more there are obstacles 3 holes Air in to both sides...

  • Page 25: Wiring Diagram

    All manuals and user guides at all-guides.com WIRING DIAGRAM MSC-A07WV - MSC-A09WV - MSC-A12WV - MODELS WIRING DIAGRAM INDOOR UNIT TO OUTDOOR UNIT TAB12 RT12 CONNECTING CN201 RT11 MUH OR MXZ TYPE NR11 CN202 MU OR MUX TYPE SR141 CN211 POWER LD103 ELECTRONIC CONTROL P.C.
  • Page 26 All manuals and user guides at all-guides.com MU-A07WV - MU-A09WV - MU-A12WV - MODELS WIRING DIAGRAM OUTDOOR UNIT FROM INDOOR UNIT CONNECTING DSAR CIRCUIT BREAKER NO COM POWER SUPPLY 230V 50Hz GRN/YLW SYMBOL NAME SYMBOL NAME SYMBOL NAME COMPRESSOR(INNER PROTECTOR) CONTACTOR COMPRESSOR CAPACITOR OUTDOOR FAN MOTOR(INNER FUSE)
  • Page 27 All manuals and user guides at all-guides.com MUX-A10WV - MODEL WIRING DIAGRAM OUTDOOR UNIT POWER SUPPLY ~ / N 230V 50Hz S MC CIRCUIT BREAKER 21R1 FROM INDOOR UNIT No.A CONNECTING 21R2 FROM INDOOR UNIT No.B CONNECTING SYMBOL NAME NAME NAME SYMBOL SYMBOL...
  • Page 28 All manuals and user guides at all-guides.com MUX-A19WV - MUX-A25WV - MODELS WIRING DIAGRAM OUTDOOR UNIT POWER SUPPLY 230V 50Hz CIRCUIT BREAKER CN90 OUTDOOR CONTROL X521 P.C. BOARD FROM INDOOR X522 UNIT A CONNECTING X522 X521 NR61 FROM INDOOR UNIT B CONNECTING CN91 2 3 4...
  • Page 29 All manuals and user guides at all-guides.com MUX-A20WV - MODEL WIRING DIAGRAM OUTDOOR UNIT...
  • Page 30 All manuals and user guides at all-guides.com MUX-A26WV - MODEL WIRING DIAGRAM OUTDOOR UNIT...
  • Page 31 All manuals and user guides at all-guides.com MODEL MXZ-A18WV- OUTDOOR UNIT TO INDOOR UNIT No.A CONNECTING DS61 TAB61 TAB63 TO INDOOR UNIT No.B CONNECTING F912 R64A R64B CIRCUIT BREAKER POWER NR63 TAB1 SUPPLY DS62 TAB62 230V 50Hz TAB2 CT61 TAB4 CN602 CN601 TAB64...

  • Page 32: Refrigerant System Diagram

    All manuals and user guides at all-guides.com REFRIGERANT SYSTEM DIAGRAM Unit:mm MSC-A07WV - MU-A07WV - MSC-A09WV - MU-A09WV - INDOOR UNIT OUTDOOR UNIT Refrigerant pipe [9.52 (with heat insulator) Stop valve (with service port) Muffler Indoor coil Indoor heat thermistor Outdoor exchanger RT12...
  • Page 33 All manuals and user guides at all-guides.com Unit:mm MSC-A07WV - MUH-A07WV - MSC-A09WV - MUH-A09WV - INDOOR UNIT OUTDOOR UNIT Refrigerant pipe [ 9.52 4-way valve (with heat insulator) Indoor coil Defrost Indoor Stop valve thermistor thermistor heat Outdoor (with service RT12 RT61 exchanger...
  • Page 34 All manuals and user guides at all-guides.com MAX. REFRIGERANT PIPING LENGTH Refrigerant piping Piping size O.D : mm Length of connecting pipe : m Max. length : m Model Liquid Indoor unit Outdoor unit MSC-A07WV - MU-A07WV - Gas 0 Gas 0.43 9.52 MSC-A09WV -...
  • Page 35 All manuals and user guides at all-guides.com Unit : mm MSC-A07WV- MUX-A10WV- INDOOR UNIT OUTDOOR UNIT Room Refrigerant pipe temperature Solenoid 9.52 thermistor (With insulation) valve RT11 Strainer Capillary tube Indoor Stop valve Muffler [3.0 x [1.4 x 1000 heat with service port UNIT A exchanger...
  • Page 36 All manuals and user guides at all-guides.com Unit : mm MSC-A07WV- MUX-A19WV- MSC-A12WV- INDOOR UNIT OUTDOOR UNIT Refrigerant pipe Room 12.7 temperature (With insulation) thermistor RT11 Indoor Stop valve Muffler heat with service port UNIT A exchanger MSC-A12WV Flared connection Indoor coil Compressor(A) Stop valve...
  • Page 37 All manuals and user guides at all-guides.com MSX-A19WV- MAX.REFRIGERANT PIPING LENGTH & MAX. HEIGHT DIFFERENCE Indoor unit A Indoor unit B MSC-A12WV - E1 MSC-A07WV - E1 Outdoor unit MUX-A19WV - E1 UNIT No. Pipe length Height difference (H) No. of bends Max.
  • Page 38 All manuals and user guides at all-guides.com Unit : mm MSC-A09WV- MUX-A20WV- INDOOR UNIT OUTDOOR UNIT Refrigerant pipe Room 9.52 temperature (With insulation) thermistor RT11 Indoor Muffler Stop valve heat with service port UNIT A exchanger MSC-A09WV Flared connection Indoor coil Compressor(A) Stop valve thermistor...
  • Page 39 All manuals and user guides at all-guides.com MSX-A20WV- MAX.REFRIGERANT PIPING LENGTH & MAX. HEIGHT DIFFERENCE Indoor unit A Indoor unit B Indoor unit C MSC-A09WV - E1 MSC-A09WV - E1 MSC-A09WV - E1 Outdoor unit MUX-A20WV - E1 UNIT No. Pipe length Height difference (H) No.
  • Page 40 All manuals and user guides at all-guides.com Unit : mm MSC-A12WV- MUX-A25WV- INDOOR UNIT OUTDOOR UNIT Refrigerant pipe Room 12.7 temperature (With insulation) thermistor RT11 Indoor Stop valve Muffler heat with service port UNIT A exchanger MSC-A12WV Flared connection Indoor coil Compressor(A) Stop valve thermistor...
  • Page 41 All manuals and user guides at all-guides.com MSX-A25WV- MAX.REFRIGERANT PIPING LENGTH & MAX. HEIGHT DIFFERENCE Indoor unit A Indoor unit B MSC-A12WV - E1 MSC-A12WV - E1 Outdoor unit MUX-A25WV - E1 UNIT No. Pipe length Height difference (H) No. of bends Max.
  • Page 42 All manuals and user guides at all-guides.com Unit : mm MSC-A09WV- MUX-A26WV- MSC-A12WV- INDOOR UNIT OUTDOOR UNIT Refrigerant pipe Room {12.7 temperature Solenoid (With insulation) thermistor valve RT11 21RA Strainer Indoor Capillary tube Stop valve Muffler heat [3.0 x [1.4 x 1000 with service port UNIT A exchanger...
  • Page 43 All manuals and user guides at all-guides.com MSX-A26WV- MAX.REFRIGERANT PIPING LENGTH & MAX. HEIGHT DIFFERENCE Indoor unit A Indoor unit B Indoor unit C Indoor unit D MSC-A12WV- E1 MSC-A12WV- E1 MSC-A09WV- E1 MSC-A09WV- E1 Outdoor unit MUX-A26WV- E1 UNIT No. Pipe length Height difference (H) No.
  • Page 44 All manuals and user guides at all-guides.com MXZ-A18WV - Unit:mm R.V. coil heating ON Discharge cooling OFF Compressor temperature Refrigerant flow in cooling thermistor Refrigerant flow in heating Muffler Stop valve (with service port) 4-way valve Gas pipe temperature B thermistor Indoor Muffler Unit B...

  • Page 45: Performance Curves

    All manuals and user guides at all-guides.com PERFORMANCE CURVES MSC-A07WV - MU-A07WV - MUH-A07WV - MUX-A10WV - MUX-A25WV - MSC-A09WV - MU-A09WV - MUH-A09WV - MUX-A19WV - MUX-A26WV - MSC-A12WV - MU-A12WV - MUH-A12WV - MUX-A20WV - MXZ-A18WV - The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions, since operating conditions vary according to the areas where these units are installed.
  • Page 46 All manuals and user guides at all-guides.com 10.6 25.2 19.2 20.4 23.3 18.8 17.8 16.3 17.2 21.4 15.7 19.4 14.8 17.5 13.3 14.1 12.5 15.5 11.8 13.6 10.4 11.0 11.7 NOTE:The above curves are for the heating operation without any frost. 10-2.OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation Both indoor and outdoor unit are under the same temperature/humidity condition.
  • Page 47 All manuals and user guides at all-guides.com MU-A09WV - MU-A09WV - (kgf/F[Gauge])(MPa[Gauge]) 230V 230V 35(:) 35(:) 70(%) 70(%) Ambient temperature(˚C) Ambient temperature(˚C) Ambient humidity(%) Ambient humidity(%) MU-A12WV - MU-A12WV - (kgf/F[Gauge])(MPa[Gauge]) 230V 230V 35(:) 35(:) 70(%) 70(%) Ambient temperature(˚C) Ambient temperature(˚C) Ambient humidity(%) Ambient humidity(%) MUH-A07WV -...
  • Page 48 All manuals and user guides at all-guides.com MUH-A12WV - MUH-A12WV - (kgf/F[Gauge])(MPa[Gauge]) 230V 230V 35 (:) 35(:) 70(%) 70(%) Ambient temperature(˚C) Ambient temperature(˚C) Ambient humidity(%) Ambient humidity(%) HEAT operation Condition indoor:Dry bulb temperature 20.0°C Outdoor:Dry bulb temperature 7,15,20°C Wet bulb temperature 14.5°C Wet bulb temperature 6,12,14.5°C MUH-A07WV - MUH-A09WV -...
  • Page 49 All manuals and user guides at all-guides.com MSC-A07WV - MUX-A10WV - MUX-A25WV - MSC-A09WV - MUX-A19WV - MUX-A26WV - MSC-A12WV - MUX-A20WV - 10-3.CAPACITY AND THE INPUT CURVES (ONE INDOOR UNIT WITH ONE OUTDOOR UNIT) 10.3 10.2 10.2 10.8 10.2 10-4.OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation Both indoor and outdoor unit are under same temperature/humidity condition.
  • Page 50 All manuals and user guides at all-guides.com MUX-A20WV- (kgf/F[Gauge])(MPa[Gauge]) Single operation (Unit A) (kgf/F[Gauge])(MPa[Gauge]) Single operation (Unit B or C) 230V 230V 230V 230V (˚C) (˚C) (˚C) (˚C) Ambient temperature(˚C) Ambient temperature(˚C) Ambient temperature(˚C) Ambient temperature(˚C) Ambient humidity(%) Ambient humidity(%) Ambient humidity(%) Ambient humidity(%) MUX-A25WV-...
  • Page 51 All manuals and user guides at all-guides.com 23.7 22.6 22.9 21.9 20.9 21.2 20.1 19.2 19.4 18.2 17.4 17.6 16.4 15.7 15.9 14.6 13.9 14.1 12.8 12.2 12.4 10.9 10.4 10.6 10-6. Capacity and input correction by inverter output frequency (OUTDOOR UNIT : MXZ-A18WV) NOTE 1 : Compressor running frequency at 33Hz (COOL) or 45Hz (HEAT).
  • Page 52 All manuals and user guides at all-guides.com 10-7. Outdoor low pressure and outdoor unit current 1. 07-class unit in single operation (OUTDOOR UNIT : MXZ-A18WV) NOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system). The converted score against the traditional unit system can be gotten according to the formula below.
  • Page 53 All manuals and user guides at all-guides.com 2. 09-class unit in single operation (OUTDOOR UNIT : MXZ-A18WV) NOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system). The converted score against the traditional unit system can be gotten according to the formula below. f •...
  • Page 54 All manuals and user guides at all-guides.com 3. 12-class unit in single operation (OUTDOOR UNIT : MXZ-A18WV) NOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system). The converted score against the traditional unit system can be gotten according to the formula below. f •...
  • Page 55 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A07WV - : MU-A07WV - CAPACITY : 2.3(kW) SHF : 0.74 INPUT : 710(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT...
  • Page 56 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A07WV - : MU-A07WV - CAPACITY : 2.3(kW) SHF : 0.74 INPUT : 710(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.25 1.26 0.56...
  • Page 57 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A09WV - : MU-A09WV - CAPACITY : 2.55(kW) SHF : 0.70 INPUT : 780(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT...
  • Page 58 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A09WV - : MU-A09WV - CAPACITY : 2.55(kW) SHF : 0.70 INPUT : 780(W) OUTDOOR DB( : ) INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.50 1.30 0.52...
  • Page 59 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A12WV - : MU-A12WV - CAPACITY : 3.45(kW) SHF : 0.67 INPUT : 1140(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT...
  • Page 60 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A12WV - : MU-A12WV - CAPACITY : 3.45(kW) SHF : 0.67 INPUT : 1140(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.38 1.66 0.49...
  • Page 61 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A07WV - : MUH-A07WV - CAPACITY : 2.3(kW) SHF : 0.74 INPUT : 710(W) OUTDOOR DB( : ) INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT...
  • Page 62 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A07WV - : MUH-A07WV - CAPACITY : 2.3(kW) SHF : 0.74 INPUT : 710(W) OUTDOOR DB( : ) INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.25 1.26 0.56...
  • Page 63 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A09WV - : MUH-A09WV - CAPACITY : 2.55(kW) SHF : 0.70 INPUT : 780(W) OUTDOOR DB( : ) INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT...
  • Page 64 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A09WV - : MUH-A09WV - CAPACITY : 2.55(kW) SHF : 0.70 INPUT : 780(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.50 1.30 0.52...
  • Page 65 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A12WV - : MUH-A12WV - CAPACITY : 3.40(kW) SHF : 0.67 INPUT : 1060(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT...
  • Page 66 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A12WV - : MUH-A12WV - CAPACITY : 3.40(kW) SHF : 0.67 INPUT : 1060(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.33 1.63 0.49...
  • Page 67 All manuals and user guides at all-guides.com PERFORMANCE DATA HEAT operation (230V) MSC-A07WV - : MUH-A07WV - CAPACITY : 2.5 kW INPUT : 690 W OUTDOOR WB(;) INDOOR DB(;) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 1.58 1.90 2.23 2.55 2.88 3.18 3.50...
  • Page 68 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A07WV - (Single) : MUX-A10WV - CAPACITY : 2.4(kW) SHF : 0.74 INPUT : 760(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT...
  • Page 69 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A07WV - (Single) : MUX-A10WV - CAPACITY : 2.4(kW) SHF : 0.74 INPUT : 760(W) OUTDOOR DB( : ) INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.35 1.32 0.56...
  • Page 70 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A07WV - (Single : Room B) : MUX-A19WV - CAPACITY : 2.4(kW) SHF : 0.74 INPUT : 820(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT...
  • Page 71 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A07WV - (Single : Room B) : MUX-A19WV - CAPACITY : 2.4(kW) SHF : 0.74 INPUT : 820(W) OUTDOOR DB( : ) INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT...
  • Page 72 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A12WV - (Single : Room A) : MUX-A19WV - CAPACITY : 3.5(kW) SHF : 0.73 INPUT : 1320(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT...
  • Page 73 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A12WV - (Single : Room A) : MUX-A19WV - CAPACITY : 3.5(kW) SHF : 0.73 INPUT : 1320(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT...
  • Page 74 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A09WV - (Single : Room A) : MUX-A20WV - CAPACITY : 2.6(kW) SHF : 0.75 INPUT : 850(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT...
  • Page 75 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A09WV - (Single : Room A) : MUX-A20WV - CAPACITY : 2.6(kW) SHF : 0.75 INPUT : 850(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT...
  • Page 76 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A09WV - (Single : Room B) : MUX-A20WV - CAPACITY : 2.9(kW) SHF : 0.71 INPUT : 1110(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT...
  • Page 77 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A09WV - (Single : Room B) : MUX-A20WV - CAPACITY : 2.9(kW) SHF : 0.71 INPUT : 1110(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT...
  • Page 78 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A12WV - (Single) : MUX-A25WV - CAPACITY : 3.5(kW) SHF : 0.73 INPUT : 1340(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT...
  • Page 79 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A12WV - (Single) : MUX-A25WV - CAPACITY : 3.5(kW) SHF : 0.73 INPUT : 1340(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.43 1.88 0.55...
  • Page 80 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A09WV - (Single : Room C ) : MUX-A26WV - CAPACITY : 2.75(kW) SHF :0.73 INPUT : 1050(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT...
  • Page 81 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A09WV - (Single : Room C ) : MUX-A26WV - CAPACITY : 2.75(kW) SHF : 0.73 INPUT : 1050(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT...
  • Page 82 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A12WV - (Single : Room A) : MUX-A26WV - CAPACITY : 3.4(kW) SHF : 0.77 INPUT : 1220(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT...
  • Page 83 All manuals and user guides at all-guides.com PERFORMANCE DATA COOL operation (230V) MSC-A12WV - (Single : Room A) : MUX-A26WV - CAPACITY : 3.4(kW) SHF : 0.77 INPUT : 1220(W) DB( : ) OUTDOOR INDOOR INDOOR DB( : ) WB( : ) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT...

  • Page 84: Microprocessor Control

    All manuals and user guides at all-guides.com MICROPROCESSOR CONTROL MSC-A07WV - MU-A07WV - MUH-A07WV - MUX-A10WV - MUX-A25WV - MSC-A09WV - MU-A09WV - MUH-A09WV - MUX-A19WV - MUX-A26WV - MSC-A12WV - MU-A12WV - MUH-A12WV - MUX-A20WV - Once the operation mode are set, the same operation mode can be repeated by simply turning the OPERATE/STOP (ON/OFF) button ON.
  • Page 85 All manuals and user guides at all-guides.com 3. Coil frost prevention Temperature control When the indoor coil thermistor RT12 reads 4°C or below(MSC-A07/A09WV) / 0°C or below(MSC-A12WV) for 5 minutes, the coil frost prevention mode starts. The indoor fan operates at the set speed and the compressor stops for 5 minutes. After that, if RT12 still reads below 4°C (MSC-A07/A09WV) / 0°C (MSC-A12WV), this mode is prolonged until the RT12 reads over 4°C (MSC-A07/A09WV) / 0°C (MSC-A12WV).
  • Page 86 All manuals and user guides at all-guides.com Operation time chart Example Thermostat Indoor fan Outdoor fan Compressor 4 min. 8 min. 3 min. 1 min. 4. Coil frost prevention The operation is as same as coil frost prevention during COOL operation.(Refer to 11-1.3.) However when coil frost prevention works while the indoor fan is OFF, its speed becomes set speed.
  • Page 87 All manuals and user guides at all-guides.com (3) Warm air control. When the following any condition of 1 (a. ~ c.) and the condition of 2 are satisfied at the same time, warm air control works. 1 a.) When outdoor unit starts operating inHEAT mode. b.) When cold air prevention has been released.
  • Page 88 All manuals and user guides at all-guides.com 4. Defrosting <MUH-A07/A09/A12WV> Defrosting of outdoor heat exchanger is controlled by DEICER P.C. board, with detection by the defrost thermistor RT61. (1) Starting conditions of defrost When all conditions of a) ~ c) are satisfied, the defrosting operation starts. a) The compressor cumulative operation time exceeds 40 minutes without the defrosting operation working.
  • Page 89 All manuals and user guides at all-guides.com 5. R.V. coil control <MUH-A07/A09/A12WV> Heating · · · · · ON Cooling · · · · · OFF Dry · · · · · · · · OFF When operation starts, the 4-way valve reverses for 5 seconds right before start-up of the compressor. Operation time chart (HEAT) (COOL/DRY)
  • Page 90 All manuals and user guides at all-guides.com (4) The initial set temperature is decided by the initial room temperature. Initial room temperature Mode Initial set temperature MU & MUX type MUH type 26: or more 26: or more COOL mode of "I FEEL CONTROL"...
  • Page 91 All manuals and user guides at all-guides.com 11-6. FAN MOTOR CONTROL (1) Rotational frequency feedback control The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feedback the rotational frequency. Comparing the current rotational frequency with the target rotational frequency (High,Med.,Low), the microprocessor controls SR141 and adjusts fan motor electric current to make the current rotational frequency close to the target rotational frequency.
  • Page 92 All manuals and user guides at all-guides.com < > (7) Cold air prevention in HEAT operation MUH-A07/A09/A12WV When any of the following conditions occurs in HEAT operation, the horizontal vane angle changes to Angle 1 automat- ically to prevent cold air blowing on users. Compressor is not operating.
  • Page 93 All manuals and user guides at all-guides.com (4) Press HR. and MIN. button to set the timer. Time setting is 10-minute units. HR. and MIN. button will work when “ ” or “ ” mark is flashing. These marks disappear in 1 minute. After setting the ON timer, check that OPERATION INDICATOR lamp of the indoor unit lights.
  • Page 94 All manuals and user guides at all-guides.com 11-10. OUTDOOR UNIT ACTUATOR CONTROL MUX-A10WV - MUX-A19WV - MUX-A25WV - INDOOR UNIT INDOOR UNIT ACTUATOR ACTUATOR – COMPRE- COMPRE- – SSOR SSOR – – ANY UNIT ON ANY UNIT ON OUTDOOR OUTDOOR MF61 MF61 FAN MOTOR...
  • Page 95 All manuals and user guides at all-guides.com 11-11 INVERTER MULTI SYSTEM CONTROL MXZ-18WV - Output signal Input signal Compressor Compressor Compressor power primary secondary factor current current Indoor unit microprocessor Outdoor unit control microprocessor Drive SSR61 circuit Transistor module Fin temperature thermistor RT65 Comp.
  • Page 96 All manuals and user guides at all-guides.com 11-11-1. INVERTER MAIN POWER SUPPLY CIRCUIT NOISE FILTER P.C.BOARD ELECTRONIC CONTROL P.C. BOARD R64A/R64B DS61/DS62 L61/L62 CT761 POWER SUPPLY CT61 11-11-2. Outline of main power supply circuit 1. At the start of operation Rush current is generated the instant the electricity is turned on to the main power supply circuit to operate the compressor.
  • Page 97 All manuals and user guides at all-guides.com 5. IPM Six power transistors that outputs the direct current waveform as three-phase alternating current waveform, the driving circuit which operates the power transistors, and the overcurrent detecting circuit which protects the power transistors are built into the IPM.
  • Page 98 All manuals and user guides at all-guides.com 11-13 LEV control Linear expansion valve (LEV) is controlled by "Thermostat ON" commands given from each unit. Indoor unit status LEV opening Stop of all indoor unit Opening before stop 500 pulse in 15 minutes When outdoor unit is operating, COOL : 5 pulse (full closed) some indoor units stop and...
  • Page 99 All manuals and user guides at all-guides.com Difference in Difference in Standard opening (pulse) capacity operation number Code2 Code3 COOL HEAT Capacity code Indoor unit <Correction> COOL HEAT 1 Suction super heat (MIN gas pipe temperature thermistor - Evaporation temperature thermistor) •...
  • Page 100 All manuals and user guides at all-guides.com (3) LEV opening correction by discharge temperature When LEV correction output is 0 pulse by the suction super heat at COOL or DRY operation, or HEAT operating, correct LEV is corrected according to the following table. The target discharge temperature is determined according to frequency zone and number of operation unit of the compressor.
  • Page 101 All manuals and user guides at all-guides.com 11-16.Discharge temperature protection control This protection controls the compressor ON/OFF and operation frequency according to temperature of the discharge temp. thermistor. (1) Compressor ON/OFF When temperature of the discharge temp. thermistor exceeds 116;, the control stops the compressor. When temperature of the discharge temp.

  • Page 102: Service Functions

    All manuals and user guides at all-guides.com SERVICE FUNCTIONS MSC-A07WV - MU-A07WV - MUH-A07WV - MUX-A10WV - MUX-A25WV - MSC-A09WV - MU-A09WV - MUH-A09WV - MUX-A19WV - MUX-A26WV - MSC-A12WV - MU-A12WV - MUH-A12WV - MUX-A20WV - MXZ-A18WV - < >...
  • Page 103 All manuals and user guides at all-guides.com How to set the remote controller exclusively for particular indoor unit After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote controller for the indoor unit.

  • Page 104: Troubleshooting

    All manuals and user guides at all-guides.com NOTE • The operation settings are memorized when 10 seconds have passed after the remote controller was operated. • If main power is cut while AUTO START/STOP timer is active, the timer setting is cancelled. •...
  • Page 105 All manuals and user guides at all-guides.com 13-2. Instruction of troubleshooting MSC-A07WV - MU-A07WV - MUH-A07WV - MUX-A10WV - MUX-A25WV - MSC-A09WV - MU-A09WV - MUH-A09WV - MUX-A19WV - MUX-A26WV - MSC-A12WV - MU-A12WV - MUH-A12WV - MUX-A20WV - Start Indoor unit OPERATION Indoor unit...
  • Page 106 All manuals and user guides at all-guides.com MXZ-A18WV - Operation start Check the outdoor unit LED indicator. LED 1 or LED 2 Both LED 1 and has blinked. LED 2 lighting J Check of power supply Refer to indicator list See page 119.
  • Page 107 All manuals and user guides at all-guides.com 13-3. Troubleshooting check table • The following indication does not depend on the shape of lamp. flashing Operation Indicator · Flashing of the OPERATION INDICATOR lamp (on the left-hand side) indicates possible abnormalities. ·...
  • Page 108 All manuals and user guides at all-guides.com MXZ-A18WV - <OUTDOOR UNIT> LED 1 (Red) LED 2 (Yellow) Error mode Lighting Lighting Normal Symptom: Outdoor unit does not operate. Indication Abnormal point Detecting method Check points LED 1 LED 2 (Red) (Yellow) When the drain abnormality is detected in the indoor unit and the indoor •...
  • Page 109 All manuals and user guides at all-guides.com Symptom: Outdoor unit operates (The compressor operates at reduced frequency) Indication Abnormal point Detecting method Check points LED 1 LED 2 (Red) (Yellow) Once Lighting Current protection When the outdoor unit input current exceeds 13A. Twice Lighting High pressure protection When indoor pipe temperature exceeds 55˚C during heating.
  • Page 110 All manuals and user guides at all-guides.com MU-A07WV - MUH-A07WV - MU-A09WV - MUH-A09WV - MU-A12WV - MUH-A12WV - Part name Check method and criterion Figure Measure the resistance with a tester. Defrost (Part temperature –10°C ~ 40°C) thermistor Normal Abnormal (RT63) MUH-A07/A09/A12WV...
  • Page 111 All manuals and user guides at all-guides.com MUX-A10WV - MUX-A19WV - MUX-A20WV - MUX-A25WV - MUX-A26WV - Part name Check method and criterion Figure Measure the resistance between the terminals with a tester. MUX-A10WV (Coil wiring temperature -10°C ~ 40°C) Outdoor fan motor Normal...
  • Page 112 All manuals and user guides at all-guides.com When OPERATION INDICATOR lamp flashes 3-time. Indoor fan motor doesn’t operate. A A Check of indoor fan motor Turn OFF the power supply. Check connector CN211 visually. Is soldered point of the Reconnect the lead wires. Resolder it.
  • Page 113 All manuals and user guides at all-guides.com The unit doesn’t operate with the remote controller. Also, the OPERATION INDICATOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch. C C Check of indoor electronic control P.C. board Check the both “parts side” and “pattern side”...
  • Page 114 All manuals and user guides at all-guides.com Compressor and/or outdoor fan doesn’t operate. D D Check of outdoor unit <MUX-A19/A20/A25/A26WV> Start Is there 230V AC Check the power supply between L - N on the TB1 and connecting wire. of outdoor unit? Press the EMERGENCY OPEERATION switch of all indoor units.
  • Page 115 All manuals and user guides at all-guides.com Compressor and/or outdoor fan motor doesn’t stop. E E Check of outdoor unit <MU-A07/A09/A12WV> Start Turn OFF the power supply. After 1 minute, turn ON power supply again. Is there 230V AC between COM on the Is there 12V DC between Does compressor or Replace the compressor...
  • Page 116 All manuals and user guides at all-guides.com Unit operates COOL mode even if it is set to HEAT mode. w First, measure the resistance of R.V. coil to confirm it is disconnected or is not short-circuit. F F Check of R.V. coil <MUH-A07/A09/A12WV>...
  • Page 117 All manuals and user guides at all-guides.com When OPERATION INDICATOR lamp flashes 0.5-second intervals or 1-time. Outdoor unit does not operate. <MUH-A07/A09/A12WV> G G How to check mis-wiring and serial signal error 1 Set the switch(SW2-2) on indoor electronic control P.C. board to MU or MUX type, when the outdoor unit is MU or MUX type.
  • Page 118 All manuals and user guides at all-guides.com When OPERATION INDICATOR lamp flashes 6-time. Thermistors in the outdoor unit are abnormal. H H Check of outdoor thermistor <MUH-A07/A09/A12WV> Start Replace the deicer P.C. board. Defrost thermistor (RT61) Reconnect CN661. Measure Turn ON the power Turn OFF the resistance Is the resistance of...
  • Page 119 All manuals and user guides at all-guides.com Outdoor unit does not operate. (LED display: display OFF) <MXZ-A18WV> J J Check of power supply Start Check the connecting of main circuit parts . Turn on power supply Is there voltage of 230V AC in the Check the power supply cable.
  • Page 120 All manuals and user guides at all-guides.com The cooling operation or heating operation does not operate. (LED display: Both LED1 and LED2 lighting) L L Check of R. V. coil <MXZ-A18WV> • When heating operation does not work. Start 1. Disconnect the lead wire leading to the compressor. 2.
  • Page 121 All manuals and user guides at all-guides.com • When cooling, heat exchanger of non-operating indoor unit frosts. • When heating, non-operating indoor unit get warm. LED display: LED1 LED2 M M Check of LEV <MXZ-A18WV> Lighting Lighting 6 time Goes out Start Turn on power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely.
  • Page 122 All manuals and user guides at all-guides.com • When thermistor is abnormal. (When the LED display is a table below.) O O Check of outdoor unit thermistor <MXZ-A18WV> Start Abnormal Disconnect the connector in the outdoor electronic control P. C. board (see below table), Replace the thermistor and measure the resistance of thermistor to check whether the thermistor is normal or not.
  • Page 123 All manuals and user guides at all-guides.com Q Q The other cases <MXZ-A18WV> Indoor unit dose not operate. (different modes) • When you try to run two indoor unit simultaneously, one for cooling and the other for heating, the unit which transmits signal to the outdoor units earlier decides the operation mode.
  • Page 124 All manuals and user guides at all-guides.com TEST POINT DIAGRAM AND VOLTAGE MSC-A07WV - MSC-A09WV - MSC-A12WV - Indoor electronic control P.C. board Fuse 250V AC 3.15A Indoor fan motor 230 V AC 12V DC Power supply input 230 V AC Varistor (NR11) R132 Indoor coil...
  • Page 125 All manuals and user guides at all-guides.com MUH-A07WV - MUH-A09WV - MUH-A12WV - Outdoor deicer P.C. board CN711 CN721 Power supply input Outdoor fan motor R.V. coil 230V AC 230V AC 230V AC NR61 Varistor Fuse 2A/250V R601 5~10VDC Defrost interval time short pin (JPDS, JPSG) (Refer to page 102.)
  • Page 126 All manuals and user guides at all-guides.com MUX-A19WV - MUX-A20WV - MUX-A25WV - MUX-A26WV - Outdoor control P.C. board To indoor unit B Solenoid coil 21R2 To indoor unit D Solenoid coil 21R4 To fan capacitor To indoor unit A To indoor unit C Solenoid coil 21R1 Solenoid coil 21R3...
  • Page 127 All manuals and user guides at all-guides.com MXZ-A18WV - Outdoor Electronic control P.C. board Defrost temperature thermistor (RT62) Evaporation temperature thermistor (RT63) Gas pipe temperature thermistor (RT6A,6B) High-pressure protection thermistor (RT68) Fin temperature thermistor (RT65) Discharge temperature thermistor (RT61) 90 100 110 120 -20 -10 0 10 20 30 40 10 20 30 40 50 60 70 80...
  • Page 128 All manuals and user guides at all-guides.com MXZ-A18WV - Outdoor Noise filter P.C.board F912 FUSE 230V AC 50Hz 3.15A/250V Input NR63 VARISTOR 230V AC 50Hz Output CN912 R.V. Coil 230V AC CN911 Outdoor Fan Fan speed “High” 230V AC CN911 Outdoor Fan Fan speed “Low”...

  • Page 129: Disassembly Instructions

    All manuals and user guides at all-guides.com DISASSEMBLY INSTRUCTIONS <"Terminal with lock mechanism" Detaching points> In case of terminal with lock mechanism, detach the terminal as shown below. 1Slide the sleeve. 1Hold the sleeve, and 2Pull the terminal while pull out the terminal pushing the locking slowly.
  • Page 130 All manuals and user guides at all-guides.com OPERATING PROCEDURE PHOTOS Vane motor 3. Removing the electrical box Indoor coil thermistor Photo 3 connector (1) Remove the front panel. (Refer to 1.) connector (2) Remove the electrical cover. (Refer to 2.) (3) Remove the V.A.
  • Page 131 All manuals and user guides at all-guides.com 14-2. MU-A07WV - MU-A09WV - MU-A12WV - OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screws of the top panel. Screws of the front panel and motor support (2) Remove the screw of the service panel.
  • Page 132 All manuals and user guides at all-guides.com OPERATING PROCEDURE PHOTOS 3. Removing the propeller fan and the outdoor fan Photo 5 motor Lead clamps (1) Remove the cabinet. (Refer to 1.) Screws of the (2) Remove the propeller fan nut. Outdoor outdoor fan motor Hook...
  • Page 133 All manuals and user guides at all-guides.com 14-3. MUH-A07WV - MUH-A09WV - MUH-A12WV - OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screws of the top panel. Screws of the front panel and motor support (2) Remove the screw of the service panel.
  • Page 134 All manuals and user guides at all-guides.com OPERATING PROCEDURE PHOTOS 3. Removing the propeller fan and the outdoor fan Photo 5 motor Lead clamps (1) Remove the cabinet. (Refer to 1.) Screws of the (2) Remove the propeller fan nut. Outdoor Hook outdoor fan motor...
  • Page 135 All manuals and user guides at all-guides.com 14-4. MUX-A10WV - OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screws of the top panel. Set screws of the front panel (2) Remove the screw of the service panel. Screws and motor support (3) Remove the screws of the cabinet.
  • Page 136 All manuals and user guides at all-guides.com OPERATING PROCEDURE PHOTOS 3. Removing the propeller fan and the outdoor fan Photo 5 motor (1) Remove the cabinet. (Refer to 1.) (2) Remove the propeller fan nut. Screws of the Screws of the (3) Remove the propeller fan.
  • Page 137 All manuals and user guides at all-guides.com 14-5. MUX-A19WV - MUX-A20WV - MUX-A25WV - MUX-A26WV - OUTDOOR UNIT NOTE : These photos are MUX-A20WV. Other models are almost the same as MUX-A20WV. OPERATING PROCEDURE PHOTOS 1.Removing the cabinet Photo 1 Top panel (1) Remove the screws of the service panel.
  • Page 138 All manuals and user guides at all-guides.com OPERATING PROCEDURE PHOTOS 2. Removing the relay panel Photo 4 (1) Remove the cabinet. (Refer to 1) (2) Disconnect the following connectors. Solenoid coil connector . Outdoor fan motor Set screws of the (21RA, 21RB, 21R1, .
  • Page 139 All manuals and user guides at all-guides.com OPERATING PROCEDURE PHOTOS 5. Removing the compressor (A, B) Photo 5 (1) Remove the cabinet. (Refer to 1.) (2) Remove the relay panel. (3) Remove the soundproof felt. (4) Remove the terminal cover on the compressor. Terminal cover (5) Disconnect lead wires from the compressor.
  • Page 140 All manuals and user guides at all-guides.com 14-6. MXZ-A18WV - OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet. Photo 1 1. Removing the cabinet. (1) Remove the screws of the top panel. (2) Remove the top panel. (3) Remove the screw of the service panel. (4) Remove the service panel.
  • Page 141 All manuals and user guides at all-guides.com OPERATING PROCEDURE PHOTOS 3. Removing the Outdoor Electronic control P.C. board. Photo 4 Screws of the cover (1) Remove the top panel, service panel and front panel. (2) Remove the connector coming out of the compressor. Screws of fan motor (3) Remove the compressor connector, compressor relay connector on the electronic control P.C.
  • Page 142 All manuals and user guides at all-guides.com OPERATING PROCEDURE PHOTOS 5. Removing the thermistor Photo 7 Discharge temperature thermistor, defrost temperature, evaporator temperature, high pressure protector, High pressure protector thermistor gas pipe temperature A and gas pipe temperature B (1) Remove the top panel, service panel, front panel. (2) Remove Indoor/outdoor connecting wire and power supply Defrost cable.
  • Page 143 All manuals and user guides at all-guides.com OPERATING PROCEDURE PHOTOS 6. Removing the compressor/4-way valve Photo 10 (1) Collect refrigerant from refrigerant circuit. Caution: If collecting has not been done enough, refrigerating machine oil may spout out or harmful substance may be generated during welding work.

  • Page 144: Parts List

    All manuals and user guides at all-guides.com PARTS LIST MSC-A07WV - (WH) MSC-A09WV - (WH) MSC-A12WV - (WH) 15-2. ACCESSORY AND 15-1. INDOOR UNIT STRUCTURAL PARTS REMOTE CONTROLLER 1 (W) 10(W) 8 (See page 127.) 7 (See page 127.) 6 (W) (W) These figures show about MSC-A12WV.
  • Page 145 All manuals and user guides at all-guides.com MSC-A07WV - (WH) MSC-A09WV - (WH) MSC-A12WV - (WH) 15-4. INDOOR UNIT HEAT EXCHANGER 15-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS 21 (W) SLEEVE BEARING ROOM TEMPERATURE THERMISTOR (W)These figures show about MSC-A12WV. VARISTOR FUSE 15-3.
  • Page 146 All manuals and user guides at all-guides.com MU-A07WV - MU-A09WV - MU-A12WV - 15-5. OUTDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration. Q'ty/unit Symbol in Wiring Part No. Part name Remarks MU-A07WV- MU-A09WV- MU-A12WV- Diagram E02 336 630...
  • Page 147 All manuals and user guides at all-guides.com MU-A07WV - MU-A09WV - MU-A12WV - 15-6. OUTDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring Remarks Part No. Part name MU-A07WV- MU-A09WV- MU-A12WV-...
  • Page 148 All manuals and user guides at all-guides.com MUH-A07WV - MUH-A09WV - MUH-A12WV - 15-7. OUTDOOR UNIT STRUCTURAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring Remarks Part name Remarks Part No. MUH-A07WV- MUH-A09WV- MUH-A12WV- Diagram...
  • Page 149 All manuals and user guides at all-guides.com MUH-A07WV - MUH-A09WV - MUH-A12WV - 15-9. ACCESSORY 15-8. OUTDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS 15-8. OUTDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring...
  • Page 150 All manuals and user guides at all-guides.com MUX-A10WV - 15-10. OUTDOOR UNIT STRUCTURAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol Part No. in Wiring Part name Remarks MUX-A10WV- Diagram E02 755 630 OUTDOOR HEAT EXCHANGER E02 336 232 CABINET E02 336 521...
  • Page 151 All manuals and user guides at all-guides.com MUX-A10WV - 15-11. OUTDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS Q'ty/unit Symbol in Wiring Remarks Part name Part No. MUX-A10WV- Diagram E02 665 501 PROPELLER FAN RA6V33- E02 677 301 OUTDOOR FAN MOTOR TERMINAL BLOCK E02 056 374 OUTDOOR FAN CAPACITOR...
  • Page 152 All manuals and user guides at all-guides.com MUX-A19WV - MUX-A20WV - MUX-A25WV - MUX-A26WV - 15-12. OUTDOOR UNIT STRUCTURAL PARTS 9 10 These figures show MUX-A20WV.
  • Page 153 All manuals and user guides at all-guides.com 15-12. OUTDOOR UNIT STRUCTURAL PARTS Part numbers that are circled are not shown in the illustration. Symbol Q'ty / unit Part Name Part No. in Wiring Remarks MUX-A19 MUX-A20 MUX-A25 MUX-A26 Diagram TOP PANEL E02 636 297 MOTOR SUPPORT E02 636 515...
  • Page 154 All manuals and user guides at all-guides.com MUX-A19WV - MUX-A20WV - MUX-A25WV - MUX-A26WV - 15-13. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. Symbol Q'ty / unit Part No. Part Name in Wiring Remarks...
  • Page 155 All manuals and user guides at all-guides.com MXZ-A18WV - 15-14. OUTDOOR UNIT 15-15. ACCESSORY FUNCTIONAL PARTS AND ELECTRICAL PARTS 15-14. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. Symbol Q'ty / unit Parts No.
  • Page 156 All manuals and user guides at all-guides.com MXZ-A18WV - 15-16. OUTDOOR UNIT FUNCTIONAL PARTS AND STRUCTURAL PARTS Part numbers that are circled are not shown in the illustration. Symbol Q'ty / unit Parts No. Parts Name in Wiring Remarks MXZ-A18WV- Diagram E02 527 521 FAN GUARD...

  • Page 157: Optional Parts

    All manuals and user guides at all-guides.com 15-17. AIR CLEANING FILTER AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity. Normal life of AIR CLEANING FILTER is 4 months. However, when it becomes dirty, replace it as soon as possible. Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet.
  • Page 158 All manuals and user guides at all-guides.com HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C C Copyright 2002 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Feb. 2003. No.OB307 REVISED EDITION-A 17 New publication, effective Feb. 2003 Distributed in Dec. 2002. No.OB307 17 Specifications subject to change without notice.

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