Mitsubishi Electric MXZ-2A40VA Service Manual
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Mitsubishi Electric MXZ-2A40VA Service Manual

Split-type, heat pump air conditioners outdoor unit
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

OUTDOOR UNIT

SERVICE MANUAL

Inverter-controlled multi system type
Models
MXZ-2A40VA -
MXZ-2A52VA -
MXZ-3A54VA -
MXZ-4A71VA -
NOTE:
•This service manual describes technical data of outdoor units.
E1
E1
E1
E2
E1
E2
E1
CONTENTS
10. PERFORMANCE CURVES ······························39
11. ACTUATOR CONTROL ····································50
12. SERVICE FUNCTIONS·····································50
13. TROUBLESHOOTING······································53
MXZ-4A80VA
14. DISASSEMBLY INSTRUCTIONS·····················77
15. PARTS LIST······················································86
16. OPTIONAL PARTS ······················BACK COVER
• MXZ-3A54/4A71VA
• MXZ-2A40/2A52VA
Please void OB377
HFC
utilized
R410A
Indoor unit service manual
MSZ-FA•VA Series (OB371)
MSZ-GA•VA Series
(OB378,OB388)
MSZ-CB•VA Series (OB441)
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················7
3. INDOOR/OUTDOOR
CORRESPONDENCE TABLE ···························8
4. INDOOR UNITS COMBINATION ·····················10
5. SPECIFICATION···············································24
6. NOISE CRITERIA CURVES ·····························27
7. OUTLINES AND DIMENSIONS ·······················28
8. WIRING DIAGRAM ··········································31
9. REFRIGERANT SYSTEM DIAGRAM ··············35
-
has been added.
E2
-
has been added.
E1
No. OB377
REVISED EDITION-A

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Summary of Contents for Mitsubishi Electric MXZ-2A40VA

  • Page 1: Outdoor Unit

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS OUTDOOR UNIT No. OB377 SERVICE MANUAL REVISED EDITION-A utilized R410A Inverter-controlled multi system type Models MXZ-2A40VA - MXZ-2A52VA - MXZ-3A54VA - MXZ-3A54VA - MXZ-4A71VA - MXZ-4A71VA - Indoor unit service manual MSZ-FA•VA Series (OB371) MXZ-4A80VA - MSZ-GA•VA Series...

  • Page 2: Technical Changes

    Revision : A • MXZ-3A54/4A71VA- has been added. Quick clean kit has been removed.(Refer to 2) • MXZ-2A40/52VA- has been added. TECHNICAL CHANGES MXZ-A26WV - MXZ-3A54VA - 1. Indication of capacity has been changed. (BTU kW) 2. Capacity specification has been changed. (Cooling capacity 7.1kW 5.4kW) 3.
  • Page 3 MXZ-A14WV - MXZ-2A40VA - 1. Indication of capacity has been changed. (BTU kW) 2. Dimensions of unit has been changed. (W840oH640oD330 W800oH550oD285) 3. Communication system has been changed. 4. Power supply way has been changed(change to supply to outdoor unit).
  • Page 4 INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT • This room air conditioner adopts 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 air 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). f [Gauge]) The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/f -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

    PART NAMES AND FUNCTIONS MXZ-2A40VA MXZ-3A54VA MXZ-2A52VA MXZ-4A71VA Air inlet Air inlet (Back and side) (back and side) Piping Drain hose Air outlet Air outlet Drain outlet Drain outlet MXZ-4A80VA Air inlet (Back and side) Air outlet Drain outlet ACCESSORIES...
  • Page 8 INDOOR/ OUTDOOR CORRESPONDENCE TABLE MXZ-2A40VA MXZ-4A71VA 22+22 22+22 22+25 22+25 22+35 22+35 25+25 22+50 25+35 22+60 25+25 25+35 25+50 MXZ-2A52VA 25+60 22+22 35+35 22+25 35+50 22+35 35+60 25+25 50+50 25+35 50+60 35+35 60+60 22+22+22 22+22+25 MXZ-3A54VA 22+22+35 22+22 22+22+50 22+25...
  • Page 9 MXZ-4A80VA MXZ-4A80VA 22+22 25+50+60 22+25 35+35+35 22+35 35+35+50 22+50 35+35+60 22+60 35+35+71 22+71 35+50+50 25+25 35+50+60 25+35 22+22+22+22 25+50 22+22+22+25 25+60 22+22+22+35 25+71 22+22+22+50 35+35 22+22+22+60 35+50 22+22+22+71 35+60 22+22+25+25 35+71 22+22+25+35 50+50 22+22+25+50 50+60 22+22+25+60 50+71 22+22+25+71 60+60 22+22+35+35 60+71 22+22+35+50 22+22+22...

  • Page 10: Indoor Units Combination

    INDOOR UNITS COMBINATION MXZ-2A40VA NOTE: Electrical data is for outdoor unit only. Cooling capacity (kW) Outdoor unit Power Indoor units Current power consumption factor Total Unit B combination Unit A (kW) 0.430 2.20 2.08 (0.9 - 3.0) (0.120 - 0.620) 0.490...
  • Page 11 MXZ-2A52VA NOTE: Electrical data is for outdoor unit only. Cooling capacity (kW) Outdoor unit Power Indoor units Current power consumption factor Total Unit B combination Unit A (kW) 0.430 2.20 2.08 (0.9 - 3.0) (0.120 - 0.620) 0.490 2.50 2.37 (0.9 - 3.3) (0.120 - 0.690) 0.730...
  • Page 12 MXZ-3A54VA NOTE: Electrical data is for outdoor unit only. Cooling capacity (kW) Outdoor unit Power Indoor units Current power consumption factor Unit A Unit B Unit C Total combination (kW) 0.590 2.59 (1.4 - 3.0) (0.420 - 0.740) 0.660 2.90 (1.4 - 3.3) (0.420 - 0.830) 0.950...
  • 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) 0.820 3.60 (1.2 - 4.2) (0.380 - 1.090) 0.910 4.00 (1.2 - 4.5) (0.380 - 1.190) 1.040 4.57...
  • Page 14 MXZ-4A71VA 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) 0.590 2.59 (1.4 - 3.0) (0.420 - 0.740) 0.660 2.90 (1.4 - 3.3)
  • Page 15 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) 1.99 25+25+35 2.09 2.09 2.92 8.74 (2.9 - 8.5) (0.670 - 2.690) 1.96 25+25+50...
  • Page 16 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) 0.820 3.60 (1.2 - 4.2) (0.380 - 1.090) 0.910 4.00 (1.2 - 4.5) (0.380 - 1.190)
  • Page 17 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 Unit D combination (kW) 2.020 25+25+35 2.53 2.53 3.54 8.87 (2.6 - 9.0) (0.500 - 2.120) 1.860 25+25+50...
  • Page 18 MXZ-4A80VA 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) 0.680 – – – 2.99 (1.4-3.0) (0.400-0.920) 0.760 –...
  • Page 19 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 22+25+50 10.41 1.79 2.04 4.07 – (2.9-9.0) (0.700-2.920) 2.390 22+25+60 1.64...
  • Page 20 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) 7.95 2.210 22+22+25+35 1.68 1.68 1.91 1.91 9.71 (3.7-9.2) (0.810-2.650) 2.150 22+22+25+50...
  • Page 21 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 Unit D combination (kW) 1.050 4.61 – – – (1.2-4.2) (0.340-1.380) 1.110 – –...
  • Page 22 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 Unit D combination (kW) 2.100 22+25+50 2.13 2.42 4.85 – 9.22 (2.6-11.6) (0.510-3.330) 2.100 22+25+60 1.93...
  • Page 23 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 Unit D combination (kW) 1.940 22+22+25+35 8.52 1.99 1.99 2.26 3.16 (3.4-11.6) (0.590-3.390) 1.890 22+22+25+50 1.74...

  • Page 24: Indoor/Outdoor

    SPECIFICATION Outdoor model MXZ-2A40VA MXZ-2A52VA Single phase Single phase Outdoor unit power supply 230V,50Hz 230V,50Hz Indoor units number Piping total length Max. 30 Max. 30 Connecting pipe length Max. 20 Max. 20 Height difference (Indoor ~ Outdoor) Refer to 9...
  • Page 25 Outdoor model MXZ-3A54VA MXZ-4A71VA Single phase Single phase Outdoor unit power supply 230V,50Hz 230V,50Hz Indoor units number 2 to 3 2 to 4 Piping total length Max. 50 Max. 60 Connecting pipe length Max. 25 Max. 25 Height difference (Indoor ~ Outdoor) Refer to 9 Refer to 9 Height difference (Indoor ~ Indoor)
  • Page 26 Outdoor model MXZ-4A80VA Single phase Outdoor unit power supply 230V,50Hz Indoor units number 2 to 4 Piping total length Max. 70 Connecting pipe length Max. 25 Height difference (Indoor ~ Outdoor) Refer to 9 Height difference (Indoor ~ Indoor) Refer to 9 Cooling Heating Function...

  • Page 27: Table Of Contents

    NOISE CRITERIA CURVES MXZ-2A40VA MXZ-2A52VA FAN SPEED FUNCTION SPL(dB LINE FAN SPEED FUNCTION SPL(dB LINE High Cooling High Cooling High Heating High Heating NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE TERESHOLD OF TERESHOLD OF HEARING FOR...

  • Page 28: Outlines And Dimensions

    Test conditions. Cooling :Dry-bulb temperature 35: Wet-bulb temperature 24: Heating :Dry-bulb temperature 7: Wet-bulb temperature 6: OUTLINES AND DIMENSIONS Unit: mm MXZ-2A40VA REQUIRED SPACE MXZ-2A52VA Basically open 100mm or more without any obstruction in front and on both sides of the unit.
  • Page 29 MXZ-3A54VA Unit: mm Open as a rule More than 500 mm if the front and both sides are open More than 100 mm 63.2 233.1 More than 200 mm if there are obstacles to both sides Air in More than 100 mm Air in Open as a rule Air out...
  • Page 30 MXZ-4A80VA Unit: mm (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(B,C,D unit) [12.7(flared)1/2(A unit) Indoor and outdoor connect wiring 26O45 hole D unit connection C unit connection...

  • Page 31: Wiring Diagram

    WIRING DIAGRAM MXZ-2A40VA MXZ-2A52VA...
  • Page 32 MXZ-3A54VA CN903 CN902...
  • Page 33 MXZ-4A71VA CN903 CN902...
  • Page 34 MXZ-4A80VA CN903 CN902...

  • Page 35: Cooling

    REFRIGERANT SYSTEM DIAGRAM MXZ-2A40VA MXZ-2A52VA Unit:mm Compressor Discharge R.V. coil temperature Refrigerant flow in cooling thermistor RT62 Refrigerant flow in heating Muffler Indoor unit [9.52 4-way valve Stop valve (with service port) Indoor unit [9.52 Outdoor heat Stop valve exchanger...

  • Page 36: Heating

    MXZ-3A54VA Unit:mm Compressor Discharge R.V. coil temperature Refrigerant flow in cooling thermistor RT62 Oil separator Refrigerant flow in heating Capillary tube Unit C gas pipe [2.5 [0.6 1000 temperature thermistor Ball valve with Indoor unit [9.52 service port 4-way valve Unit B gas pipe temperature thermistor Indoor unit...
  • Page 37 MXZ-4A71VA Unit:mm Compressor Discharge R.V. coil temperature Refrigerant flow in cooling thermistor RT62 Refrigerant flow in heating Oil separator Unit D gas pipe Capillary tube temperature thermistor Indoor unit [9.52 [2.5 [0.6 1000 Ball valve with Unit C gas pipe service port temperature thermistor 4-way valve...
  • Page 38 MXZ-4A80VA Unit:mm Compressor Discharge High-pressure R.V. coil temperature switch Refrigerant flow in cooling thermistor RT62 Refrigerant flow in heating Oil separator Capillary tube Unit D gas pipe [2.5 [0.6 1000 Ball valve with temperature thermistor Indoor unit service port [9.52 4-way valve Unit C gas pipe temperature thermistor...

  • Page 39: Performance Curves

    PERFORMANCE CURVES MXZ-2A40VA MXZ-4A71VA MXZ-2A52VA MXZ-4A80VA MXZ-3A54VA 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 40 10-1. Capacity and the input curves MXZ-2A40VA MXZ-2A52VA 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...
  • Page 41 MXZ-3A54VA MXZ-4A71VA 13.1 10.6 13.7 11.9 12.4 10.8 11.3 10.1 25.4 24.0 25.9 31.4 31.9 23.4 22.2 23.9 29.0 29.4 21.5 20.3 21.9 26.6 27.0 19.5 18.5 19.9 24.1 24.5 17.6 16.6 17.9 21.7 22.1 15.6 14.8 15.9 19.3 19.6 13.7 12.9 13.9...
  • Page 42 10-2. Capacity and input correction by inverter output frequency (OUTDOOR UNIT:MXZ-2A40VA/2A52VA) 1. 22-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Capacity <HEAT>Total input Frequency Frequency Frequency Frequency 2. 25-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Capacity <HEAT>Total input Frequency...
  • Page 43 (OUTDOOR UNIT:MXZ-3A54VA) 1. 22-class unit in single operation <HEAT>Capacity <HEAT>Total input <COOL>Capacity <COOL>Total input Frequency Frequency Frequency Frequency 2. 25-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Capacity <HEAT>Total input Frequency Frequency Frequency Frequency 3. 35-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Capacity...
  • Page 44 (OUTDOOR UNIT:MXZ-4A71VA) 1. 22-class unit in single operation <HEAT>Capacity <HEAT>Total input <COOL>Capacity <COOL>Total input Frequency Frequency Frequency Frequency 2. 25-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Capacity <HEAT>Total input Frequency Frequency Frequency Frequency 3. 35-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Capacity...
  • Page 45 (OUTDOOR UNIT:MXZ-4A80VA) 1. 22-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Capacity <HEAT>Total input Frequency Frequency Frequency Frequency 2. 25-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Capacity <HEAT>Total input Frequency Frequency Frequency Frequency 3. 35-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Capacity...
  • Page 46 The conversion factor is : 1(MPa[Gauge]) =10.2(kgf/f (1) COOL operation Relative humidity(%) Dry-bulb temperature(:) 1 Both indoor and outdoor unit are under the same temperature/humidity condition. 2 Operation : TEST RUN OPERATION (refer to 10-3.) MXZ-2A40VA MXZ-2A52VA 22-class unit 25-class unit (kgf/F[Gauge]) (MPa[Gauge]) (kgf/F[Gauge]) (MPa[Gauge])
  • Page 47 MXZ-3A54VA MXZ-4A71VA 22-class unit 25-class unit (kgf/F[Gauge]) (MPa[Gauge]) (kgf/F[Gauge]) (MPa[Gauge]) 40Hz 40Hz 40Hz 40Hz Ambient temperature(:) Ambient temperature(:) Ambient temperature(:) Ambient temperature(:) Ambient humidity(%) Ambient humidity(%) Ambient humidity(%) Ambient humidity(%) 35-class unit 50-class unit (kgf/F[Gauge]) (MPa[Gauge]) (kgf/F[Gauge]) (MPa[Gauge]) 40Hz 40Hz 40Hz 40Hz Ambient temperature(:)
  • Page 48 Indoor Outdoor Dry bulb temperature (°C) 20.0 20.0 Wet bulb temperature (°C) 14.5 14.5 2 Operation : TEST RUN OPERATION (refer to 10-3.) MXZ-2A40VA MXZ-2A52VA 22-class unit 25-class unit 35-class unit 35Hz 35Hz 35Hz Ambient temperature(:) Ambient temperature(:) Ambient temperature(:)
  • Page 49 MXZ-3A54VA MXZ-4A71VA 50-class unit 22-class unit 25-class unit 35-class unit 48Hz 48Hz 48Hz 48Hz Ambient temperature(:) Ambient temperature(:) Ambient temperature(:) Ambient temperature(:) MXZ-4A71VA 60-class unit 48Hz Ambient temperature(:) MXZ-4A80VA 50-class unit 22-class unit 25-class unit 35-class unit 32Hz 32Hz 32Hz 32Hz Ambient temperature(:) Ambient temperature(:)

  • Page 50: Actuator Control

    ACTUATOR CONTROL MXZ-2A40VA MXZ-2A52VA MXZ-3A54VA MXZ-4A71VA MXZ-4A80VA Relation between main sensor and actuator Actuator Sensor Purpose Outdoor Reversing Compressor fan motor valve Discharge temperature thermistor Protection Indoor pipe temperature thermistor Defrosting Protection Defrost thermistor Defrosting Gas pipe temperature thermistor Control...
  • Page 51 12-3. AUTO LINE CORRECTING function (MXZ-2A) This outdoor model has an auto line correcting function which automatically detects incorrect wiring or piping as shown in the following pictures, and interchanges the wiring lines (A to B/B to A) with the software. Only one indoor unit has to be performed cooling operation for 30 minutes to complete the detection.
  • Page 52 <Incorrect piping> INDOOR UNIT A INDOOR UNIT B OUTDOOR UNIT The auto line correcting can be confirmed in the following way: 1 Turn OFF the power supply. 2 Turn ON the 4th Dip Switch of SW1 on the display P.C. board. 3 Turn ON the power supply.

  • Page 53: Troubleshooting

    TROUBLESHOOTING MXZ-2A40VA MXZ-2A52VA MXZ-3A54VA MXZ-4A71VA MXZ-4A80VA 13-1. Cautions on troubleshooting 1. Before troubleshooting, check the following: 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for mis-wiring. 2. Take care the following during servicing. 1) Before servicing the air conditioner, be sure to turn off the unit first with the remote controller, and then after confirm- ing the horizontal vane is closed, turn off the breaker and/or disconnect the power plug.
  • Page 54 2. Outdoor unit failure mode table MXZ-2A The left lamp of LED indication Indoor/outdoor Abnormal point OPERATION INDICAOR Condition Correspondence (Outdoor P.C. board) unit failure mode (Failure mode / protection) recall function lamp(Indoor unit) LED 1 LED 2 None(Normal) Outdoor power system 2-time flash Lighting Lighting When over current protection stop is...
  • Page 55 LED indication The left lamp of Indoor/outdoor Abnormal point (Outdoor P.C. board) Condition Correspondence OPERATION INDICATOR unit failure mode (Failure mode / protection) recall function lamp(Indoor unit) LED 1 LED 2 8 times Goes • Replace the power When a short or open circuit is Current sensor 11-time flash detected in the current sensor...
  • Page 56 MXZ-3A/4A LED indication The left lamp of Indoor/outdoor Abnormal point Correspondence OPERATION INDICAOR (Outdoor P.C. board) Condition unit failure mode (Failure mode / protection) recall function lamp(Indoor unit) LED 1 LED 2 None(Normal) 2-time flash Outdoor power system Lighting Lighting When over current protection stop is •...
  • Page 57 LED indication The left lamp of Indoor/outdoor Abnormal point (Outdoor P.C. board) Condition Correspondence OPERATION INDICATOR unit failure mode (Failure mode / protection) recall function lamp(Indoor unit) LED 1 LED 2 Communication error 11-time flash Communication error occurs Lighting 6 times •...

  • Page 58: Troubleshooting Check Table

    13-4. Troubleshooting check table MXZ-2A Indication Symptom Abnormal point / Condition Condition Correspondence LED1(Red) LED2(Yellow) Outdoor unit • Refer to 13-6.D "Check of LEV". Lightning Once LEV for drain When the indoor unit detects any abnormality in the LEV for drain. does not •...
  • Page 59 Indication No. Symptom Abnormal point / Condition Condition Correspondence LED1(Red) LED2(Yellow) Outdoor unit This symptom does not mean any abnormality of the operates. product, but check the following points. Cooling high-pressure When the outdoor heat exchanger temperature exceeds 58: • Check if indoor filters are clogged.
  • Page 60 MXZ-3A/4A Indication Symptom Abnormal point / Condition Condition Correspondence LED1(Red) LED2(Yellow) Outdoor unit • Refer to 13-6.D "Check of LEV". When the indoor unit detects any abnormality in the LEV for drain. Lightning Once LEV for drain does not • Check the drain pump of the indoor unit. operate.
  • Page 61 Indication No. Symptom Abnormal point / Condition Condition Correspondence LED1(Red) LED2(Yellow) Outdoor unit These symptoms do not mean any abnormality of the Primary current protection When the input current exceeds 15A. Once Lighting operates. product, but check the following points. Secondary current protection When the current of the compressor exceeds 15A.
  • Page 62 13-5. Trouble criterion of main parts MXZ-2A40VA MXZ-2A52VA MXZ-3A54VA MXZ-4A71VA MXZ-4A80VA Part name Check method and criterion Defrost thermistor (RT61) Measure the resistance with a tester. Ambient temperature Refer to 13-7. “Test point diagram and voltage”,1. “Inverter P.C. board” or 2.
  • Page 63 13-6. Troubleshooting flow Outdoor unit does not operate. (LED display: display OFF) A A Check of power supply MXZ-2A40/2A54 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 64 • When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch. Indoor unit does not operate. • When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit does not operate. (LED display : Both LED1 and LED 2 lighting) B B How to check mis-wiring and serial signal error (when outdoor unit does not work) Turn OFF the power supply.
  • Page 65 The cooling operation or heating operation does not operate. (LED display: Both LED1 and LED2 lighting) C C Check of R.V. coil MXZ-2A MXZ-3A/4A CN912 Power P.C. board Noise filter P.C. board CN781 Outdoor electronic control P.C. board CN933 Inverter P.C. board •...
  • Page 66 • When cooling, heat exchanger of non-operating indoor unit frosts. • When heating, non-operating indoor unit get warm. D D Check of LEV LED display: LED1 LED2 Lighting Lighting Lighting Once Turn on power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely.
  • Page 67 • When heating, room does not get warm. • When cooling, room does not get cool. E E How to check inverter/ compressor LED display: LED1 LED2 Lighting Lighting Lighting Twice Twice Goes out Disconnect the terminal of the compressor. 3 minutes after turning on the power supply, start EMERGENCY OPERATION.
  • Page 68 • When thermistor is abnormal. (When the LED display is a table below.) F F Check of outdoor thermistors Abnormal Disconnect the connector in the following table and measure the resistance of the Replace the thermistor. thermistor to check whether the thermistor is normal or not. Normal Reconnect the connector in the following table and disconnect the lead wire leading to the compressor.
  • Page 69 • Fan motor does not operate or stops operating shortly after starting the operation. G G Check of outdoor fan motor Check the connection between the connector CN931 and CN932. Is the resistance between each terminal of outdoor fan motor normal? Disconnect CN932 from outdoor electronic control P.C.
  • Page 70 • When the operation frequency does not go up from lowest frequency. H H Check of HPS MXZ-4A80VA 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 turned off. Infinity Check the resistance between Replace HPS.
  • Page 71 13-7. Test point diagram and voltage 1. Inverter P.C. board MXZ-2A40VA MXZ-2A52VA 8V DC Back side of unit FUSE(F801) FUSE(F901) 230V AC Input 3.15V/250V 3.15V/250V 325V DC 5V DC 12V DC JK,JGO interface P.C.board Output to drive compressor LEV A...
  • Page 72 2. Outdoor electronic control P.C. board Defrost thermistor (RT61) MXZ-3A54VA MXZ-4A71VA MXZ-4A80VA Ambient temperature thermistor (RT65) Gas pipe temperature thermistor (RT6A,6B,6C,6D) Discharge temperature thermistor (RT62) Outdoor heat exchanger temperature thermistor (RT68) Fin temperature thermistor (RT64) 100 110 120 10 20 30 40 50 60 70 80 Temperature (;) Temperature (;) Temperature (;)
  • Page 73 3. Noise filter P.C. board MXZ-3A54VA MXZ-4A71VA MXZ-4A80VA CN901 To electronic CN902 CN903 control To power To power P.C. board board board 230V AC 50Hz Input CN912 R.V. coil 230V AC 230V AC 230V AC 50Hz 50Hz Output Output NR64 VARISTOR F64 FUSE F911 FUSE 2A/250V...
  • Page 74 4. Power P.C. board MXZ-2A40VA MXZ-2A52VA F61(FUSE) 20A/250V Front side of unit Back side of unit 230V AC Input 230V AC Output R.V.coil (CN912) 230V AC FUSE(F64) R.V.coil Zero cross 3.15A/250V Primary current To inverter P.C.board(CN934)
  • Page 75 5. Outdoor Power board MXZ-3A54VA MXZ-4A71VA MXZ-4A80VA 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 76 6. Display P.C. board MXZ-2A40VA MXZ-2A52VA LED1 LED2 7. Interface P.C. board MXZ-2A40VA MXZ-2A52VA Serial signal room A Serial signal 230V AC room B...

  • Page 77: Disassembly Instructions

    2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 14-1. MXZ-2A40VA MXZ-2A52VA OUTDOOR UNIT OPERATING PROCEDURE PHOTOS Photo 1 1. Removing the cabinet. (1) Remove the screw fixing the service panel. (See Photo 1.) Screws (2) Pull down the service panel and remove it.
  • Page 78 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 2 and power P.C. board (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Disconnect the power supply and indoor/outdoor Screws of the connecting wire and remove the back panel. (Refer to 1.) relay panel (3) Disconnect the ground wires(See Photo 2.), the lead wire to the reactor and the following connectors;...
  • Page 79 OPERATING PROCEDURE PHOTOS 5. Removing outdoor fan motor Photo 5 (1) Remove the top panel, cabinet and service panel. Outdoor heat exchanger (Refer to 1.) temperature (2) Disconnect the power supply and indoor/outdoor connecting wire. thermistor (3) Disconnect the connectors for outdoor fan motor. (4) Remove the propeller nut.
  • Page 80 14-2. MXZ-3A54VA MXZ-4A71VA OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the compressor Photo 1 Screws of the (1)Remove the screws of the top panel, and remove the top top panel panel. (2)Remove the screws of the service panel, and remove the service panel.
  • Page 81 OPERATING PROCEDURE PHOTOS Photo 3 Screw of the rear guard Screw of the back panel R.V. coil Photo 5 4 way valve Screws of the back panel LEV coil Expansion valve Suction pipe Screws of welded part the back panel Screw of the back panel Discharge...
  • Page 82 OPERATING PROCEDURE PHOTOS 3. Removing the 4-way valve Photo 7 (1)Remove the top panel. (Photo 1) (2)Remove the service panel the cabinet and the back panel. Recover refrigerant gas. 4 way valve (3)Remove the electrical parts. (Photo 4) (4)Detach the welded parts of 4-way valve and pipe. (Photo 7) R.V.
  • Page 83 14-3. MXZ-4A80VA 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 the top panel. (2)Remove the screws of the service panel, and remove the service panel.
  • Page 84 OPERATING PROCEDURE PHOTOS Photo 4 2. Removing the fan motor (1)Remove the top panel, the service panel, and the front panel. (Photo 1) Screws of the outdoor fan motor (2)Disconnect the connector CN931 and CN932 on the outdoor electronic control P.C. board. (3)Remove the propeller.
  • Page 85 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. (Photo 7) Screws of the reactor...

  • Page 86: Parts List

    PARTS LIST MXZ-2A40VA MXZ-2A52VA 15-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS...
  • Page 87 MXZ-2A40VA MXZ-2A52VA 15-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS Part number that is circled is not shown in the illustration. Symbol Q'ty/unit in Wiring Part Name Remarks Part No. MXZ-2A40VA- MXZ-2A52VA- Diagram E02 927 232 CABINET E02 927 521...
  • Page 88 MXZ-2A40VA MXZ-2A52VA 15-2. OUTDOOR UNIT ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring Remarks Part No. Part Name MXZ-2A40VA- MXZ-2A52VA- Diagram E02 838 337 REACTOR E02 A47 440 POWER P.C. BOARD E02 A47 454 INTERFACE P.C.
  • Page 89 MXZ-2A40VA MXZ-2A52VA 15-3. DRAIN SOCKET Outdoor unit {42 drain hole Soft vinyl chloride hose of 25mm inside diameter. Q'ty/unit Symbol in Wiring Parts No. Parts Name Remarks MXZ-2A40VA- MXZ-2A52VA- Diagram E02 838 704 DRAIN SOCKET...
  • Page 90 MXZ-3A54VA MXZ-4A71VA 15-4. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 5 6 7 8...
  • Page 91 MXZ-3A54VA MXZ-4A71VA 15-4. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol MXZ-3A54VA- MXZ-4A71VA- in Wiring Parts No. Parts Name Remarks Diagram E02 939 232 CABINET E02 817 009 HANDLE E02 939 521 GRILLE...
  • Page 92 MXZ-3A54VA MXZ-4A71VA 15-5. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS 15-6. ACCESSORY...
  • Page 93 MXZ-3A54VA MXZ-4A71VA 15-5. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring MXZ-3A54VA- MXZ-4A71VA- Parts No. Parts Name Remarks Diagram E02 851 501 PROPELLER RC0J60- E02 938 301 OUTDOOR FAN MOTOR E02 939 440 POWER BOARD...
  • Page 94 MXZ-4A80VA 15-7. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 7 8 9 10...
  • Page 95 MXZ-4A80VA 15-7. 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-4A80VA- Diagram M21 TK0 232 FRONT PANEL M21 TK0 027 HANDLE ASSEMBLY M21 TK5 010 GRILLE M21 TK0 245...
  • Page 96 MXZ-4A80VA 15-8. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS 15-9. ACCESSORY...
  • Page 97 MXZ-4A80VA 15-8. 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-4A80VA- Diagram M21 TK0 501 PROPELLER M21 TK0 301 OUTDOOR FAN MOTOR PM8H60- T2W YH1 440 Including heat sink and RT64...

  • Page 98: Optional Parts

    5 - [6 Punched hole MAC-855SG HEAD OFFICE: TOKYO BLDG.,2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Dec. 2005. No.OB377 REVISED EDITION-A 8 Distributed in Feb. 2005. No.OB377 8 New publication, effective Dec. 2005 Made in Japan Specifications subject to change without notice.

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