Mitsubishi Electric MXZ-A18WV Service Manual
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Mitsubishi Electric MXZ-A18WV Service Manual

Inverter-controlled multi system, split-type, heat pump air conditioners
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

SERVICE MANUAL

Inverter-controlled multi system
Models
MXZ-A18WV -
MXZ-A26WV -
MXZ-A32WV -
NOTE:
•The description for MXZ-A18WV-
EDITION-A.
•SPECIFICATION, PERFORMANCE CURVES and PARTS LIST of MXZ-A18WV-
modified.
•This service manual describes technical data of outdoor units.
As for indoor units, refer to the service manual OB307 REVISED EDITION-A, OB321, OB327 or B329.
Indication of model name
MXZ-A18WV -
E1
has been transferred here from service manual OB307 REVISED
E1
HFC
utilized
R410A
E1
E1
E1
CONTENTS
1. TECHNICAL CHANGES ····································3
2. PART NAMES AND FUNCTIONS······················7
CORRESPONDENCE TABLE ···························7
4. INDOOR UNITS COMBINATION ·····················10
5. SPECIFICATION···············································21
6. NOISE CRITERIA CURVES ·····························23
7. OUTLINES AND DIMENSIONS ·······················24
8. WIRING DIAGRAM ··········································27
9. REFRIGERANT SYSTEM DIAGRAM ··············30
10. PERFORMANCE CURVES ······························33
11. MICROPROCESSOR CONTROL·····················47
12. TROUBLESHOOTING······································52
13. DISASSEMBLY INSTRUCTIONS·····················71
14. PARTS LIST······················································78
15. OPTIONAL PARTS···········································83
E1
No. OB319
have been partially

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Summary of Contents for Mitsubishi Electric MXZ-A18WV

  • Page 1: Table Of Contents

    NOTE: •The description for MXZ-A18WV- has been transferred here from service manual OB307 REVISED EDITION-A. •SPECIFICATION, PERFORMANCE CURVES and PARTS LIST of MXZ-A18WV- have been partially modified. •This service manual describes technical data of outdoor units. As for indoor units, refer to the service manual OB307 REVISED EDITION-A, OB321, OB327 or B329.

  • Page 3: Technical Changes

    TECHNICAL CHANGES MXZ-18TV - MXZ-A18WV - 1. Outdoor model has changed. 2. Refrigerant has changed. (R22 R410A) MXZ-24UV - MXZ-A26WV - 1. Cooling capacity has become larger. (7.1kW 7.2kW) 2. Combinations of connectable indoor units have increased. 3. Capacity class of connectable indoor units has become larger.
  • Page 4 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 5 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 1.Tools dedicated for the air conditioner with R410A refrigerant The following tools are required for R410A refrigerant.
  • Page 6 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 12.7 15.88 3.Refrigerant oil Apply the special refrigeration oil (accessories: packed with indoor unit) to the flare and the union seat surfaces.

  • Page 7: Part Names And Functions

    (Back and side) Air outlet Air outlet Drain outlet Drain outlet ACCESSORIES MXZ-A18WV- MXZ-A26WV- MXZ-A32WV- Drain socket Drain cap INDOOR/ OUTDOOR CORRESPONDENCE TABLE 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.
  • Page 8 MXZ-A26WV - OUTDOOR UNIT MXZ-A26WV- 07+07 07+09 07+12 07+18 07+24 07+26 09+09 09+12 09+18 09+24 09+26 12+12 12+18 12+24 12+26 18+18 18+24 18+26 07+07+07 07+07+09 07+07+12 07+07+18 07+07+24 07+07+26 07+09+09 07+09+12 07+09+18 07+09+24 07+09+26 07+12+12 07+12+18 07+12+24 07+12+26 07+18+18 07+18+24 07+18+26 09+09+09 09+09+12...
  • Page 9 MXZ-A32WV - OUTDOOR UNIT OUTDOOR UNIT MXZ-A32WV- MXZ-A32WV- 07+07 09+18+24 07+09 12+12+12 07+12 12+12+18 07+18 12+12+24 07+24 12+12+26 07+26 12+18+18 09+09 12+18+24 09+12 07+07+07+07 09+18 07+07+07+09 09+24 07+07+07+12 09+26 07+07+07+18 12+12 07+07+07+24 12+18 07+07+07+26 12+24 07+07+09+09 12+26 07+07+09+12 18+18 07+07+09+18 18+24 07+07+09+24 18+26...

  • Page 10: Indoor Units Combination

    INDOOR UNITS COMBINATION MXZ-A18WV - NOTE: Electrical data is for outdoor unit only. Cooling capacity (kW) Current Outdoor unit Power Indoor units power consumption factor combination Total Unit A Unit B (kW) 230V 0.750 – 3.62 (0.9-2.95) (0.225-1.000) 0.810 –...
  • Page 11 MXZ-A26WV - NOTE: Electrical data is for outdoor unit only. Cooling capacity (kW) Outdoor unit Power Indoor units Current power consumption factor Total Unit A Unit B Unit C combination (kW) 0.710 – – 3.12 (1.4-3.0) (0.400-0.920) 0.760 – – 3.34 (1.4-3.3) (0.400-1.010)
  • Page 12 NOTE: Electrical data is for outdoor unit only. Cooling capacity (kW) Outdoor unit Power Indoor units Current power consumption factor Total Unit A Unit B Unit C combination (kW) 2.390 07+09+26 1.54 4.45 10.50 (2.9-8.5) (0.680-2.530) 2.350 07+12+12 1.62 2.79 2.79 10.32 (2.9-8.5)
  • Page 13 NOTE: Electrical data is for outdoor unit only. Heating capacity (kW) Outdoor unit Power Indoor units Current power consumption factor Total Unit A Unit B Unit C combination (kW) 1.050 – – 4.61 (1.2-4.2) (0.340-1.380) 1.110 – – 4.87 (1.2-4.5) (0.340-1.510) 1.210 –...
  • Page 14 NOTE: Electrical data is for outdoor unit only. Heating capacity (kW) Outdoor unit Power Indoor units Current power consumption factor Unit A Unit B Unit C Total combination (kW) 2.020 07+09+26 1.92 5.57 8.87 (2.6-11.0) (0.510-3.040) 2.180 07+12+12 2.03 3.48 3.48 9.57 (2.6-11.0)
  • Page 15 MXZ-A32WV - NOTE: Electrical data is for outdoor unit only. Cooling capacity (kW) Outdoor unit Power Indoor units Current power consumption factor Total Unit A Unit B Unit C Unit D combination (kW) 0.710 – – – 3.12 (1.4-3.0) (0.400-0.920) 0.760 –...
  • Page 16 NOTE: Electrical data is for outdoor unit only. Cooling capacity (kW) Outdoor unit Power Indoor units Current power consumption factor Total combination Unit A Unit B Unit C Unit D (kW) 2.370 07+09+18 1.62 2.09 4.18 – 10.41 (2.9-9.0) (0.700-2.920) 2.390 07+09+24 –...
  • Page 17 NOTE: Electrical data is for outdoor unit only. Cooling capacity (kW) Outdoor unit Power Indoor units Current power consumption factor Total Unit A Unit B Unit C Unit D combination (kW) 7.95 2.210 07+07+09+12 9.71 1.59 1.59 2.04 2.72 (3.7-9.2) (0.810-2.650) 2.150 07+07+09+18...
  • Page 18 NOTE: Electrical data is for outdoor unit only. Heating capacity (kW) Outdoor unit Power Indoor units Current power consumption factor Total combination Unit A Unit B Unit C Unit D (kW) 1.050 – – – 4.61 (1.2-4.2) (0.340-1.380) 1.110 – –...
  • Page 19 NOTE: Electrical data is for outdoor unit only. Heating capacity (kW) Outdoor unit Power Indoor units Current power consumption factor Total combination Unit A Unit B Unit C Unit D (kW) 2.100 07+09+18 1.93 2.48 4.97 – 9.22 (2.6-11.6) (0.510-3.330) 2.100 07+09+24 1.64...
  • Page 20 NOTE: Electrical data is for outdoor unit only. Heating capacity (kW) Outdoor unit Power Indoor units Current power consumption factor Total combination Unit A Unit B Unit C Unit D (kW) 1.940 07+07+09+12 1.88 1.88 2.41 3.22 8.52 (3.4-11.6) (0.590-3.390) 1.890 07+07+09+18 2.06...

  • Page 21: Specification

    SPECIFICATION Outdoor model MXZ-A18WV - Single phase Outdoor unit power supply 230V,50Hz Indoor units number Indoor units total capacity (Connectable) 2 Total capacity 24 indoor units total capacity (Simultaneous operation) 2 Total capacity 24 Piping total length Max. 30 (chargeless 20) Connecting pipe length Max.
  • Page 22 Outdoor model MXZ-A26WV - MXZ-A32WV - Single phase Single phase Outdoor unit power supply 230V,50Hz 230V,50Hz Indoor units number 2 to 3 2 to 4 Indoor units total capacity (Connectable) 2 Total capacity 54 Total capacity 54 Indoor units total capacity (Simultaneous operation) 2 Total capacity 54 Total capacity 54 Piping total length...

  • Page 23: Noise Criteria Curves

    NOISE CRITERIA CURVES MXZ-A18WV - MXZ-A26WV - FAN SPEED FUNCTION SPL(dB LINE FAN SPEED FUNCTION SPL(dB LINE High Cooling High Cooling MXZ-A32WV - High Heating High Heating Test conditions. Test conditions. Cooling :DB 35: WB 24: Cooling :DB 35: WB 24:...

  • Page 24: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: mm OUTDOOR UNIT MXZ-A18WV - REQUIRED SPACE Open as a rule More than100mm if the front and both sides are open Drainage More than 100mm More than 3 holes Air in 200mm or more if 100mm...

  • Page 25: Outdoor Unit

    Unit: mm OUTDOOR UNIT MXZ-A26WV - (200) 2-U-shape notched holes (Base bolt M10) Air in Rubber cushion Air in Veranda Base Air out Drainage holes 3-[33 2-12O36 Oval hole Gas pipe (Base bolt M10) [9.52(flared)3/8(B,C unit) [12.7(flared)1/2(A unit) Indoor and outdoor connect wiring 23O45 hole...
  • Page 26 Unit: mm OUTDOOR UNIT MXZ-A32WV - (200) 2-U-shape notched holes (Base bolt M10) Rubber cushion Air in Veranda Air in Base Air out Drainage holes 3-[33 2-12O36 Oval hole Gas pipe (Base bolt M10) [9.52(flared)3/8(C,D unit) [12.7(flared)1/2(A,B unit) Indoor and outdoor connect wiring 23O45 hole...

  • Page 27: Wiring Diagram

    WIRING DIAGRAM MXZ-A18WV - MODEL WIRING DIAGRAM 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...
  • Page 28 MXZ-A26WV - MODEL WIRING DIAGRAM OUTDOOR UNIT CN903 CN902...
  • Page 29 MXZ-A32WV - MODEL WIRING DIAGRAM OUTDOOR UNIT CN903 CN902...

  • Page 30: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MXZ-A18WV - Unit:mm R.V. coil Discharge heating ON Compressor temperature cooling OFF thermistor RT61 Refrigerant flow in cooling Refrigerant flow in heating Muffler Stop valve (with service port) 4-way valve Gas pipe temperature B thermistor Indoor Muffler...
  • Page 31 MXZ-A26WV - Unit:mm Compressor Discharge High-pressure R.V. coil temperature Refrigerant flow in cooling switch heating ON thermistor RT61 Refrigerant flow in heating Oil separator cooling OFF Capillary tube Service port [2.5 [0.6 1000 Ball valve with service port 4-way valve Unit C gas pipe temperature thermistor Indoor unit...
  • Page 32 MXZ-A32WV - Unit:mm Compressor Discharge High-pressure R.V. coil Refrigerant flow in cooling temperature switch heating ON Refrigerant flow in heating thermistor RT61 cooling OFF Oil separator Capillary tube Service port [2.5 [0.6 1000 Unit D gas pipe Ball valve with temperature thermistor Indoor unit [9.52...

  • Page 33: Performance Curves

    PERFORMANCE CURVES MXZ-A18WV- MXZ-A26WV- MXZ-A32WV- 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. The following information has been pro- vided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
  • Page 34 10-1. Capacity and the input curves MXZ-A18WV- 10.6 25.4 24.0 25.9 23.4 22.2 23.9 21.5 20.3 21.9 19.5 18.5 19.9 17.6 16.6 17.9 15.6 14.8 15.9 13.7 12.9 13.9 11.7 11.1 12.0 MXZ-A26WV- MXZ-A32WV- 13.1 17.0 10.6 13.7 11.9 15.4 12.4...
  • Page 35 10-2. Capacity and input correction by inverter output frequency (OUTDOOR UNIT : MXZ-A18WV) 1. 07-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Capacity <HEAT>Total input Frequency Frequency Frequency Frequency 2. 09-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Capacity <HEAT>Total input...
  • Page 36 (OUTDOOR UNIT:MXZ-A26WV, MXZ-A32WV) 1. 07-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Capacity <HEAT>Total input Frequency Frequency Frequency Frequency 2. 09-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Capacity <HEAT>Total input Frequency Frequency Frequency Frequency 3. 12-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Capacity...
  • Page 37 6. 26-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Capacity <HEAT>Total input Frequency Frequency Frequency Frequency...
  • Page 38 10-3. 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 conversion factor is : 1(MPa[Gauge]) =10.2(kgf/f...
  • Page 39 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 conversion factor is : 1(MPa[Gauge]) =10.2(kgf/f f [Gauge]) (1) COOL operation 1Both indoor and outdoor units are under the same temperature/humidity condition.
  • Page 40 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 conversion factor is : 1(MPa[Gauge]) =10.2(kgf/f f [Gauge]) (1) COOL operation 1Both indoor and outdoor units are under the same temperature/humidity condition.
  • Page 41 4. 07-class unit in single operation (OUTDOOR UNIT : MXZ-A26WV, MXZ-A32WV) 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]) (1) COOL operation 1Both indoor and outdoor units are under the same <How to work fixed-frequency operation>...
  • Page 42 5. 09-class unit in single operation (OUTDOOR UNIT : MXZ-A26WV, MXZ-A32WV) 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]) (1) COOL operation 1Both indoor and outdoor units are under the same temperature/humidity condition.
  • Page 43 6. 12-class unit in single operation (OUTDOOR UNIT : MXZ-A26WV, MXZ-A32WV) 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]) (1) COOL operation 1Both indoor and outdoor units are under the same temperature/humidity condition.
  • Page 44 7. 18-class unit in single operation (OUTDOOR UNIT : MXZ-A26WV, MXZ-A32WV) 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]) (1) COOL operation Both indoor and outdoor units are under the same <How to work fixed-frequency operation>...
  • Page 45 8. 24-class unit in single operation (OUTDOOR UNIT : MXZ-A26WV, MXZ-A32WV) 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]) (1) COOL operation Both indoor and outdoor units are under the same <How to work fixed-frequency operation>...
  • Page 46 9. 26-class unit in single operation (OUTDOOR UNIT : MXZ-A26WV, MXZ-A32WV) 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]) (1) COOL operation Both indoor and outdoor units are under the same <How to work fixed-frequency operation>...

  • Page 47: Microprocessor Control

    MICROPROCESSOR CONTROL 11-1. INVERTER MULTI SYSTEM CONTROL MXZ-A18WV - 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. Discharge...
  • Page 48 MXZ-A26WV - Output signal Input signal Indoor unit microprocessor Outdoor unit control microprocessor Fan motor drive Comp- IPM/PFC micropro- SSR61 Drive cessor ressor microprocessor primary current Drive Transistor Drive circuit module circuit Fin temperature thermistor RT65 module Compressor Transistor secondary module current Comp.
  • Page 49 MXZ-A32WV - Output signal Input signal Indoor unit microprocessor Outdoor unit control microprocessor Fan motor drive Comp- IPM/PFC micropro- SSR61 Drive ressor cessor microprocessor primary current Drive Transistor Drive circuit module circuit Fin temperature thermistor RT65 module Compressor Transistor secondary module current Comp.
  • Page 50 Fan speed is switched according to the number of operating indoor unit and the compressor frequency. Fan speed Down High Min. Compressor frequency Max. <Relation between compressor frequency and fan speed.> MXZ-A26WV, A32WV MXZ-A18WV Indoor unit operation Indoor unit operation Mode Mode Fan speed Fan speed 1 unit 2 units...
  • Page 51 When the number of rotation is lowered to around 100 rpm, the fan may stop by the influence of wind, but restarts 30 seconds later. 11-7.Relation between main sensor and actuator Relation between main sensor and actuator. MXZ-A18WV Actuator Sensor Purpose...

  • Page 52: Troubleshooting

    • Check the indoor unit with referring to the indoor unit service manual, and confirm that there is any problem in the indoor unit. Then, check the outdoor unit with referring to this page. MXZ-A18WV - MXZ-A26WV - MXZ-A32WV -...

  • Page 53: Troubleshooting Check Table

    12-3. Troubleshooting check table MXZ-A18WV - 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 54 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 gas pipe temperature exceeds 55˚C during heating. Twice Lighting Defrosting in cooling When indoor gas pipe temperature falls to 6˚C or below during cooling.
  • Page 55 MXZ-A26WV - MXZ-A32WV - 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 56 Symptom: It is repeated that outdoor unit stops and restarts 3 minutes later Indication Abnormal point Detecting method Check points LED 1 LED 2 (Red) (Yellow) • Check the outdoor unit air passage. • Check the outdoor fan motor. 4 times Goes out P.C. board temperature When the P.C.
  • Page 57 MXZ-A18WV - MXZ-A26WV - MXZ-A32WV - Part name Check method and criterion Defrost thermistor Measure the resistance using a tester. Evaporation/ Gas pipe/ (Part temperature : -10°C ~ 40°C) High-pressure protect/ Normal abnormal Outdoor heat exchanger Open or short-circuit 5kΩ ~ 55kΩ...
  • Page 58 Outdoor unit does not operate. (LED display: display OFF) A A Check of power supply MXZ-A18WV Start Check the connecting of parts of main power supply circuit. Turn on power supply. Is there voltage of 230V AC in the Check the power supply cable.
  • Page 59 3. Check the connection of indoor/ outdoor unit connecting wire in the outdoor unit terminal block, and check the connection of the connector CN601: unit A, CN602: unit B (MXZ-A18WV)/ CN601: unitA, CN602: unitB, CN603: unitC, CN604: unitD (MXZ-A26/A32WV) in the outdoor electronic control P. C. board.
  • Page 60 OPERATION in HEAT mode. 1. Turn off power supply of indoor and outdoor unit, and Is there voltage of 230V AC between pin1 and disconnect the connector CN851 (MXZ-A18WV)/ CN781 pin 2 at connector CN912? (MXZ-A26/A32WV) in the outdoor electronic control P.C.
  • Page 61 Normal Or, do you feel vibration of the LEV coil with a hand? Disconnect the connector CN771: LEV A, CN772: LEV B (MXZ-A18WV)/ Replace the outdoor electronic CN791: LEV A, CN792: LEV B, CN793: LEV C, control P. C. board.
  • Page 62 • When heating, room does not get warm. • When cooling, room does not get cool. E E Check of inverter/ compressor MXZ-A18WV LED display: LED1 LED2 Lighting Lighting Lighting Twice Twice Goes out Start Disconnect the terminal of the compressor at terminals. 3 minutes after turning on the power supply, start EMERGENCY OPERATION.
  • Page 63 MXZ-A26/A32WV Start Disconnect the terminal of the compressor. 3 minutes after turning on the power supply, start EMERGENCY OPERATION. W • After the outdoor fan starts running, wait for 1 minutes or more before Measure the voltage between each measuring the voltage. •...
  • Page 64 • When thermistor is abnormal. (When the LED display is a table below.) F F 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.
  • Page 65 • Fan motor does not operate or stops operating shortly after starting the operation. G G Check of outdoor fan motor MXZ-A18WV Start Check the connection of connector CN851 in the fan motor relay connector and outdoor electronic control P. C. board at the noise filter P.
  • Page 66 • When the operation frequency does not go up from lowest frequency. H H Check of HPS MXZ-A26/A32WV Start 1. Disconnect the connector CN681 in the electronic control P. C. board. 2. Check the resistance of HPS after 1 minutes have passed since the outdoor unit power supply was turnd off. Infinity Check the resistance between Replace HPS.
  • Page 67 MXZ-A18WV - Outdoor electronic control P.C. board Defrost temperature thermistor (RT62) Evaporation temperature thermistor (RT63) Gas pipe temperature thermistor (RT6A,6B) Fin temperature thermistor (RT65) Discharge temperature thermistor (RT61) High-pressure protection thermistor (RT68) 100 110 120 Temperature (;) 10 20 30 40 50 60 70 80 Temperature (;)
  • Page 68 Defrost temperature thermistor (RT62) MXZ-A26WV - MXZ-A32WV - Evaporation temperature thermistor (RT63) Gas pipe temperature thermistor (RT6A,6B) Outdoor electronic control P.C. board Fin temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) Discharge temperature thermistor (RT61) 10 20 30 40 50 60 70 80 100 110 120 Temperature (;) Temperature (;)
  • Page 69 MXZ-A18WV - Noise filter P.C.board F912 FUSE 230V AC 50Hz 3.15A/250V Input NR63 VARISTOR F911 FUSE 1A/250V 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 70 MXZ-A26WV - MXZ-A32WV - Outdoor Power board Connect to the compressor Voltage among phases: 5V to 180V 325-370V DC Output (Red) (–) (White) Connect to the earth Signal reception (From electronic control P.C. board) 5V DC pulse wave Fin temperature thermistor Primary current detection (Connect to the noise filter) Connect to the controller board...

  • Page 71: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS 13-1. 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.
  • Page 72 OPERATING PROCEDURE PHOTOS 3. Removing the Outdoor Electronic control P.C. board. Photo 5 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 73 OPERATING PROCEDURE PHOTOS 5. Removing the thermistor Photo 8 Discharge temperature thermistor, defrost, evaporator temperature, high-pressure protect, High-pressure protect 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 74 OPERATING PROCEDURE PHOTOS 6. Removing the compressor/4-way valve Photo 11 (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. (2) Remove indoor/outdoor connecting wire and power supply cable.
  • Page 75 13-2. MXZ-A26WV - MXZ-A32WV - OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the compressor Photo 1 Screws of the top panel (1)Remove the screws of the top panel, and remove it. (2)Remove the screws of the service panel, and remove it. Recover refrigerant gas.
  • Page 76 PHOTOS OPERATING PROCEDURE Photo 4 2. Removing the fan motor (1)Remove the top panel, the service panel, and the front panel. Screws of the outdoor fan motor (Photo 1) (2)Disconnect the connector CN911 on the outdoor electronic control P.C. board. (3)Remove the propeller.
  • Page 77 OPERATING PROCEDURE PHOTOS 5. Removing the reactor Photo 7 (1)Remove the top panel. (Photo 1) (2)Disconnect the reactor lead wire. (3)Remove the screws of the reactor, and remove the reactor. Screws of the reactor...

  • Page 78: Parts List

    PARTS LIST MXZ-A18WV - 14-1. OUTDOOR UNIT FUNCTIONAL PARTS AND STRUCTURAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring Parts No. Parts Name Remarks MXZ-A18WV- Diagram E02 819 521 FAN GUARD E02 737 232...

  • Page 79: Electrical Parts

    MXZ-A18WV - 14-2. OUTDOOR UNIT 14-3. ACCESSORY ELECTRICAL PARTS 14-2. OUTDOOR UNIT ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring Parts No. Parts Name Remarks MXZ-A18WV- Diagram E02 735 337 REACTOR E02 735 444 NOISE FILTER P.C.
  • Page 80 MXZ-A26WV - MXZ-A32WV - 14-4. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 7 8 9 10...
  • Page 81 14-4. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring Parts No. Parts Name Remarks MXZ-A26WV- MXZ-A32WV- Diagram M21 TK0 232 FRONT PANLE M21 TK0 027 HANDLE ASSEMBLY T7W E02 691 GRILLE M21 TK0 245...
  • Page 82 MXZ-A26WV - MXZ-A32WV - 14-5. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring Parts No. Parts Name Remarks MXZ-A26WV- MXZ-A32WV- Diagram M21 TK0 501 PROPELLER R01 E28 221 OUTDOOR FAN MOTOR PM8H60- T2W TK0 440...

  • Page 83: Optional Parts

    DRAIN SOCKET O1 T2W E59 704 DRAIN SOCKET ASSEMBLY DRAIN CAP O2 OPTIONAL PARTS 15-1. Different-diameter pipe Unit : mm (inch) Connected pipes Length Length Length MXZ-A18WV Model name diameter (mm) For different- {9.52 — {12.7 {9.52 {12.7 diameter MAC-A454JP (3/8) (1/2)
  • Page 84 HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C C Copyright 2003 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Dec. 2003. No.OB319 7 New publication, effective Dec. 2003 Made in Japan Specifications subject to change without notice.

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