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Mitsubishi MXZ-2A20NA Service Manual

Inverter-controlled multi system type
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
OUTDOOR UNIT
SERVICE MANUAL
Inverter-controlled multi system type
Models
MXZ-2A20NA
MXZ-2A20NA -
MXZ-3A30NA
MXZ-3A30NA -
MXZ-4A36NA
NOTE:
• This service manual describes technical
data of the outdoor units.
• RoHS compliant products have <G> mark
on the spec name plate.
For servicing of RoHS compliant products,
refer to the RoHS Parts List.
1
1
MXZ-2A20NA
MXZ-2A20NA -
1
9700058
Revision C:
• MXZ-4A36NA have been added.
Please void OB444 REVISED EDITION-B.
HFC
utilized
R410A
Indoor unit service manual
MSZ-A·NA Series (OB450)
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················6
4. SPECIFICATION···············································18
5. OUTLINES AND DIMENSIONS ·······················21
6. WIRING DIAGRAM ··········································25
7. REFRIGERANT SYSTEM DIAGRAM ··············30
8. DATA·································································36
9. ACTUATOR CONTROL····································52
10. SERVICE FUNCTIONS·····································52
11. TROUBLESHOOTING ······································54
12. DISASSEMBLY INSTRUCTIONS·····················71
13. PARTS LIST······················································80
14. RoHS PARTS LIST···········································88
15. OPTIONAL PARTS·········································100
The Slim Line.
From Mitsubishi Electric.
33223
No. OB444
REVISED EDITION-C
TM

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Summary of Contents for Mitsubishi MXZ-2A20NA

  • Page 1: Table Of Contents

    OUTDOOR UNIT No. OB444 SERVICE MANUAL REVISED EDITION-C utilized R410A Inverter-controlled multi system type Models MXZ-2A20NA MXZ-2A20NA - MXZ-3A30NA MXZ-3A30NA - MXZ-4A36NA Indoor unit service manual MSZ-A·NA Series (OB450) CONTENTS 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················6 3. INDOOR UNIT OPERATIONAL CHARACTERISTICS····7 4.

  • Page 2: Technical Changes

    Revision A: • RoHS PARTS LIST has been added. Revision B: • MXZ-2A20NA - and MXZ-3A30NA - have been added. Revision C: • MXZ-4A36NA has been added. TECHNICAL CHANGES MXZ-2A20NA New model MXZ-30TN2 MXZ-3A30NA 1. Combinations of connectable indoor units have been increased.
  • Page 3 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.
  • Page 4 New Specification Current Specification The incompatible refrigeration oil easily separates from Since refrigerant and refrigeration oil are compatible, refrigerant and is in the upper layer inside the suction muffler. refrigeration oil goes back to the compressor through the Raising position of the oil back hole enables to back the lower position oil back hole.
  • Page 5 2.Refrigerant piping 1 Specifications Use the copper or copper-alloy seamless pipes for refrigerant that meet the following specifications. Outside diameter Wall thickness Insulation material (inch) (inch) 0.0315 0.0315 Heat resisting foam plastic 0.0315 Specific gravity 0.045 Thickness 0.315 inch 0.0394 2 Flaring work and flare nut Flaring work for R410A pipe differs from that for R22 pipe.

  • Page 6: Part Names And Functions

    Air inlet (Back and side) Air outlet Drain outlet MXZ-3A30NA Air inlet (Back and side) Air outlet Drain outlet MXZ-3A30NA - MXZ-4A36NA Air inlet (Back and side) Air outlet Drain outlet...

  • Page 7: Indoor Unit Operational Characteristics

    INDOOR UNIT OPERATIONAL CHARACTERISTICS The following charts show indoor unit performance when operating individually or in combination. For authorized system configurations of the indoor units, please refer to the Mr. Slim brochure. MXZ-2A20NA MXZ-2A20NA - Cooling capacity (BTU/h) Current Power...
  • Page 8 MXZ-3A30NA MXZ-3A30NA - Cooling capacity (BTU/h) Current Power Indoor units Power consumption factor combination Total Unit A Unit B Unit C 208V 230V 9,000 9,000 – – 4.05 3.66 (650 ~ 800) (7,200 ~ 9,000) 1,000 12,000 12,000 – – 5.06 4.58 (650 ~ 1,000)
  • Page 9 Heating capacity (BTU/h) Current Power Power consumption Indoor units factor combination Total Unit A Unit B Unit C 208V 230V 10,900 1,100 10,900 5.57 5.03 – – (8,600 ~ 15,400) (780 ~1,520) 13,600 1,380 13,600 6.98 6.32 – – (8,600 ~ 16,400) (780 ~ 1,600) 18,000 1,940...
  • Page 10 MXZ-4A36NA 208V Cooling capacity (BTU/h) Current Power Indoor units Power consumption factor combination Total Unit A Unit B Unit C Unit D 208V 9,000 9,000 – – 4.05 – (7,200 ~ 9,000) (650 ~ 800) 12,000 1,000 12,000 – – –...
  • Page 11 Cooling capacity (BTU/h) Current Power Power consumption Indoor units factor combination Unit A Unit B Unit C Unit D Total 208V 32,100 3,500 09+12+15 8,000 10,700 13,400 – 17.35 (12,600 ~ 32,100) (1,000 ~ 3,500) 32,100 3,500 09+12+17 7,600 10,100 14,400 –...
  • Page 12 Heating capacity (BTU/h) Current Power Power consumption Indoor units factor combination Total Unit A Unit B Unit C Unit D 208V 10,900 1,100 10,900 – – – 5.57 (8,600 ~ 15,400) (780 ~1,520) 13,600 1,380 – 13,600 – – 6.98 (8,600 ~ 16,400) (780 ~ 1,600) 18,000...
  • Page 13 Heating capacity (BTU/h) Current Power Power consumption Indoor units factor combination Total Unit A Unit B Unit C Unit D 208V 32,400 2,700 7,900 9,900 14,600 – 09+12+17 13.38 (11,400 ~ 36,000) (740 ~ 2,880) 32,400 2,700 7,600 12,400 12,400 –...
  • Page 14 MXZ-4A36NA 230V Cooling capacity (BTU/h) Current Power Indoor units Power consumption factor combination Total Unit A Unit B Unit C Unit D 230V 9,000 9,000 – – 3.66 – (7,200 ~ 9,000) (650 ~ 800) 12,000 1,000 12,000 – – –...
  • Page 15 Cooling capacity (BTU/h) Current Power Power consumption Indoor units factor combination Unit A Unit B Unit C Unit D Total 230V 32,100 3,500 09+12+15 8,000 10,700 13,400 – 15.69 (12,600 ~ 32,100) (1,000 ~ 3,500) 32,100 3,500 09+12+17 7,600 10,100 14,400 –...
  • Page 16 Heating capacity (BTU/h) Current Power Power consumption Indoor units factor combination Total Unit A Unit B Unit C Unit D 230V 10,900 1,100 10,900 – – – 5.03 (8,600 ~ 15,400) (780 ~1,520) 13,600 1,380 – 13,600 – – 6.32 (8,600 ~ 16,400) (780 ~ 1,600) 18,000...
  • Page 17 Heating capacity (BTU/h) Current Power Power consumption Indoor units factor combination Total Unit A Unit B Unit C Unit D 230V 32,400 2,700 7,900 9,900 14,600 – 09+12+17 12.10 (11,400 ~ 36,000) (740 ~ 2,880) 32,400 2,700 7,600 12,400 12,400 –...

  • Page 18: Specification

    SPECIFICATION Item Model MXZ-2A20NA MXZ-2A20NA - 20,000/ (7,800 ~ 20,000) Cooling Btu/h 22,000/ (8,500 ~ 22,000) Capacity Heating 47 Btu/h Heating 17 14,500 Btu/h 2,150/ (630 ~ 2,150) Cooling Power Heating 47 1,780/ (520 ~ 1,780) consumption Heating 17 1,500 (1,500) 9.3 [ 15 ]...
  • Page 19 Item Model MXZ-3A30NA MXZ-3A30NA - Cooling 28,400/ (12,600 ~ 28,400) Btu/h Capacity Heating 47 Btu/h 28,600/ (11,400 ~ 36,000) Heating 17 18,800 Btu/h Cooling 3,250/ (1,000 ~ 3,250) Power Heating 47 2,180/ (740 ~ 2,880) consumption Heating 17 2,120 8.7 [ 16.0 ] [SEER] Cooling HSPF IV (V)
  • Page 20 Item Model MXZ-4A36NA Cooling 36,000/ (12,600 ~ 36,400) Btu/h Capacity Heating 47 Btu/h 208V 36,000/ (11,400 ~ 41,200) 230V 36,000/ (11,400 ~ 43,000) Heating 17 24,600 Btu/h Cooling 3,820/ (1,000 ~ 3,900) Power Heating 47 208V 3,100/ (740 ~ 4,000) 230V 3,100/ (740 ~ 4,350) consumption...

  • Page 21: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: inch MXZ-2A20NA MXZ-2A20NA - REQUIRED SPACE Open as a rule More than 19.69 in. if the front and both sides are 6-9/16" 19-11/16" 6-21/32" open 9-3/16" 11-11/32" 2-1/2" More than 3.94 in. More than 3.94 in.
  • Page 22 MXZ-3A30NA Unit: inch REQUIRED SPACE Open as a rule More than 19.69 in. if the front and both sides are open 7-7/8" 19-11/16" (7-7/8") More than 3.94 in. 9-27/32" More than 3.94 in. More than 7.87 in. 10-5/8" 1-3/8" if there are obstacles to both 2-U-shape notched holes sides...

  • Page 23: Installation Space

    MXZ-3A30NA - Unit: inch 7-7/8" 19-11/16" 7-7/8" 9-27/32" 10-5/8" 2-U Shaped notched hole 1-3/8" (Base bolt M10) Air in Air in Drain hole 3-[1-5/16" Air out 2-(15/32"o1-13/32") Oval hole (Base bolt M10) 3-[7/8"Punched hole (Connect wiring hole) 1-3/16" 12-19/32" 13/32" 35-7/16"...
  • Page 24 MXZ-4A36NA Unit: inch 7-7/8" 19-11/16" 7-7/8" 9-27/32" 10-5/8" 2-U Shaped notched hole 1-3/8" (Base bolt M10) Air in Air in Drain hole 3-[1-5/16" Air out 2-(15/32"o1-13/32") Oval hole (Base bolt M10) 3-[7/8"Punched hole (Connect wiring hole) 1-3/16" 12-19/32" 13/32" 35-7/16" 2-[7/8"Knockout Handle (Connect wiring hole)

  • Page 25: Wiring Diagram

    WIRING DIAGRAM MXZ-2A20NA...
  • Page 26 MXZ-2A20NA -...
  • Page 27 MXZ-3A30NA...
  • Page 28 MXZ-3A30NA -...
  • Page 29 MXZ-4A36NA CN903 CN902...

  • Page 30: Refrigerant System Diagram

    O.D.0.16 I.D.0.11 3.93 RT61 Indoor unit Capillary tube Strainer LEV A O.D.0.14 I.D.0.09 19.68 #100 Ball valve Strainer Strainer LEV E #100 #100 Distributor Power receiver Capillary tube O.D.0.16 I.D.0.11 3.93 Indoor unit LEV B Strainer #100 W Except MXZ-2A20NA -...
  • Page 31 Operating Range MXZ-2A20NA MXZ-2A20NA - Indoor intake air temperature Outdoor intake air temperature Maximum 95˚FDB, 71˚FWB 115˚FDB Cooling Minimum 67˚FDB, 57˚FWB 14˚FDB Maximum 80˚FDB, 67˚FWB 75˚FDB, 65˚FWB Heating Minimum 70˚FDB, 60˚FWB 14˚FDB, 12˚FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION...
  • Page 32 MXZ-3A30NA Service Unit:mm port Service Compressor R.V. coil port Discharge High-pressure Refrigerant flow in cooling temperature switch Refrigerant flow in heating thermistor RT62 Oil separator Capillary tube O.D.0.10 I.D.0.02 39.37 Unit C gas pipe Ball valve with temperature thermistor Indoor unit service port 4-way valve Unit B gas pipe...
  • Page 33 Operating Range MXZ-3A30NA MXZ-3A30NA - Indoor intake air temperature Outdoor intake air temperature Maximum 95˚FDB, 71˚FWB 115˚FDB Cooling Minimum 67˚FDB, 57˚FWB 14˚FDB Maximum 80˚FDB, 67˚FWB 75˚FDB, 65˚FWB Heating Minimum 70˚FDB, 60˚FWB 14˚FDB, 12˚FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-3A30NA MXZ-3A30NA - Piping length each indoor unit (a, b, c) 82ft.
  • Page 34 MXZ-4A36NA Unit:mm Service port Compressor Service port Discharge R.V. coil temperature High-pressure Refrigerant flow in cooling thermistor RT62 switch Refrigerant flow in heating Oil separator Capillary tube Indoor unit O.D.0.10 I.D.0.02 39.37 Stop valve 4-way valve (with service port) Indoor unit Indoor unit Muffler Indoor unit...
  • Page 35 Operating Range MXZ-4A36NA Indoor intake air temperature Outdoor intake air temperature Maximum 95˚FDB, 71˚FWB 115˚FDB Cooling Minimum 67˚FDB, 57˚FWB 14˚FDB Maximum 80˚FDB, 67˚FWB 75˚FDB, 65˚FWB Heating Minimum 70˚FDB, 60˚FWB 14˚FDB, 12˚FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-4A36NA Piping length each indoor unit (a, b, c, d) 82ft.

  • Page 36: Data

    DATA MXZ-2A20NA MXZ-2A20NA - Model Item Unit Cooling Heating Capacity Btu / h 20,000 22,000 Total — – – Input 2.15 1.78 Outdoor unit MXZ-2A20NA MXZ-2A20NA - Power supply (V, phase, Hz) 208/230, 1, 60 Electrical Input 2.113 circuit 1.743 Comp.
  • Page 37 Model MXZ-3A30NA MXZ-3A30NA - Item Unit Cooling Heating Capacity Btu / h 28,400 28,600 Total — – – Input 3.25 2.18 Outdoor unit MXZ-3A30NA MXZ-3A30NA - Power supply (V, phase, Hz) 208/230, 1, 60 Electrical Input 3.197 circuit 2.127 Comp. current (208/230V) 15.45/13.97 10.15/9.18 Fan motor current (208/230V)
  • Page 38 Model MXZ-4A36NA Item Unit Cooling Heating Capacity Btu / h 36,000 36,000 Total — – – Input 3.82 Outdoor unit MXZ-4A36NA Power supply (V, phase, Hz) 208/230, 1, 60 Electrical Input 3.756 circuit 3.036 Comp. current (208/230V) 17.85 / 16.14 14.36 /12.98 Fan motor current (208/230V) 0.43 / 0.39...
  • Page 39 8-1. OPERATING RANGE (1) POWER SUPPLY Rating Guaranteed Voltage Model MXZ-2A20NA MXZ-2A20NA - Min. 198V 208V 230V Max. 253V Outdoor unit MXZ-3A30NA 208/230V 60Hz 1[ MXZ-3A30NA - MXZ-4A36NA (2) OPERATION Intake air Indoor Outdoor temperature Function Condition DB (˚F) WB (˚F) DB (˚F)
  • Page 40 MXZ-2A20NA MXZ-2A20NA - MXZ-3A30NA MXZ-3A30NA - MXZ-4A36NA The standard 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 41 8-2. CAPACITY AND THE INPUT CURVES MXZ-2A20NA MXZ-2A20NA 14.0 16.7 20.0 13.0 15.3 18.4 11.9 14.0 16.6 10.6 13.0 14.9 11.3 13.5 10.1 11.9 43.2 47.0 57.4 40.0 43.4 53.1 36.5 39.8 48.6 33.3 36.0 44.3 29.9 32.4 39.8 26.6 28.8...
  • Page 42 8-3. Capacity and input correction by means of inverter output frequency (OUTDOOR UNIT : MXZ-2A20NA MXZ-2A20NA - 1. 09-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Capacity <HEAT>Total input Frequency Frequency Frequency Frequency 2. 12-class unit in single operation <COOL>Capacity <COOL>Total input...
  • Page 43 (OUTDOOR UNIT:MXZ-3A30NA MXZ-3A30NA - MXZ-4A36NA ) 1. 09-class unit in single operation <COOL>Total input <COOL>Capacity <HEAT>Capacity <HEAT>Total input Frequency Frequency Frequency Frequency 2. 12-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Capacity <HEAT>Total input Frequency Frequency Frequency Frequency 3. 15-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Capacity...
  • Page 44 8-4. Outdoor low pressure and outdoor unit current 1. 09-class unit in single operation (OUTDOOR UNIT : MXZ-2A20NA MXZ-2A20NA - (1) COOL operation 1Data is based on the condition of indoor humidity 50% <How to work fixed-frequency operation> 2Air flow speed : High 1.Set emergency switch to COOL or HEAT.
  • Page 45 2. 12-class unit in single operation (OUTDOOR UNIT : MXZ-2A20NA MXZ-2A20NA - (1) COOL operation 1Data is based on the condition of indoor humidity 50% <How to work fixed-frequency operation> 2Air flow speed : High 1.Set emergency switch to COOL or HEAT. The switch is locat- 3Inverter output frequency : 33Hz ed on indoor unit.
  • Page 46 3. 15-class unit in single operation (OUTDOOR UNIT : MXZ-2A20NA MXZ-2A20NA - (1) COOL operation 1Data is based on the condition of indoor humidity 50% <How to work fixed-frequency operation> 2Air flow speed : High 1.Set emergency switch to COOL or HEAT. The switch is locat- 3Inverter output frequency : 33Hz ed on indoor unit.

  • Page 47: Class Unit In Single Operation

    4. 09-class unit in single operation (OUTDOOR UNIT : MXZ-3A30NA MXZ-3A30NA - MXZ-4A36NA ) (1) COOL operation 1Data is based on the condition of indoor humidity 50% <How to work fixed-frequency operation> 2Air flow speed : High 1.Set emergency switch to COOL or HEAT. The switch is locat- 3Inverter output frequency : 33Hz ed on indoor unit.

  • Page 48: Class Unit In Single Operation

    5. 12-class unit in single operation (OUTDOOR UNIT : MXZ-3A30NA MXZ-3A30NA - MXZ-4A36NA ) (1) COOL operation 1Data is based on the condition of indoor humidity 50% <How to work fixed-frequency operation> 2Air flow speed : High 1.Set emergency switch to COOL or HEAT. The switch is locat- 3Inverter output frequency : 33Hz ed on indoor unit.

  • Page 49: Class Unit In Single Operation

    6. 15-class unit in single operation (OUTDOOR UNIT : MXZ-3A30NA MXZ-3A30NA - MXZ-4A36NA ) (1) COOL operation 1Data is based on the condition of indoor humidity 50% <How to work fixed-frequency operation> 2Air flow speed : High 1.Set emergency switch to COOL or HEAT. The switch is locat- 3Inverter output frequency : 33Hz ed on indoor unit.

  • Page 50: Class Unit In Single Operation

    7. 17-class unit in single operation (OUTDOOR UNIT : MXZ-3A30NA MXZ-3A30NA - MXZ-4A36NA ) (1) COOL operation 1Data is based on the condition of indoor humidity 50% 2Air flow speed : High <How to work fixed-frequency operation> 3Inverter output frequency : 33Hz 1.Set emergency switch to COOL or HEAT.

  • Page 51: Class Unit In Single Operation

    8. 24-class unit in single operation (OUTDOOR UNIT : MXZ-3A30NA MXZ-3A30NA - MXZ-4A36NA ) (1) COOL operation 1Data is based on the condition of indoor humidity 50% 2Air flow speed : High <How to work fixed-frequency operation> 1.Set emergency switch to COOL or HEAT. The switch is locat- 3Inverter output frequency : 33Hz ed on indoor unit.

  • Page 52: Actuator Control

    Protection Capacity code Control SERVICE FUNCTIONS 10-1. Pre-heat control <MXZ-2A20NA - , MXZ-3A30NA - , MXZ-4A36NA > If moisture gets into the refrigerant cycle, or when refrigerant is liquefied and collected in the compressor, it may interfere the start-up of the compressor.
  • Page 53 10-2. Auto line correcting <MXZ-3A30NA - , MXZ-4A36NA > Outdoor unit has an auto line correcting function which automatically detects and corrects improper wiring or piping. Improper wiring or piping can be automatically detected by pressing the piping/wiring correction switch (SW871). When improper wiring or piping is detected, wiring lines are corrected.

  • Page 54: Troubleshooting

    TROUBLESHOOTING MXZ-2A20NA MXZ-2A20NA - MXZ-3A30NA MXZ-3A30NA - MXZ-4A36NA 11-1. 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 of the following during servicing.
  • Page 55 A detected in the thermistor during • Refer to 11-6.F "Check cooling. of outdoor thermistors". Gas pipe temperature Lighting 11 times (A,B: MXZ-2A20NA, MXZ-3A30NA) thermistor B (C : MXZ-3A30NA) Gas pipe temperature Lighting 12 times thermistor C 4-time flash...
  • Page 56 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 57 A cooling. Gas pipe temperature Lighting 10 times • Refer to 11-6. "Check of outdoor thermistors". (A,B : MXZ-2A20NA, MXZ-3A30NA) thermistor B : MXZ-3A30NA) Gas pipe temperature thermistor C Communication error When the communication protection stop between boards is •...
  • Page 58 Normal Lighting Outdoor electronic control P.C. board(Parts side) NOTE 1. The location of LED is illustrated at the right figure. Refer to 11-7.1. MXZ-2A20NA, MXZ-2A20NA- , MXZ-3A30NA 2. LED is lighted during normal operation. LED2 LED1 The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
  • Page 59 11-5. Trouble criterion of main parts MXZ-2A20NA MXZ-2A20NA - MXZ-3A30NA MXZ-3A30NA - MXZ-4A36NA Part name Check method and criterion Defrost thermistor (RT61) Measure the resistance with a tester. Ambient temperature thermistor (RT65) Refer to 11-7. “Test point diagram and voltage”,1. “Outdoor electronic control P.C.
  • Page 60 11-6. Troubleshooting flow MXZ-2A20NA MXZ-2A20NA - MXZ-3A30NA MXZ-3A30NA - MXZ-4A36NA Outdoor unit does not operate. (LED display: display OFF) A A Check of power supply Check the connecting of parts of main power supply circuit. Turn ON the power supply.

  • Page 61: Outdoor Unit Does Not Operate

    <Confirmation of the power to the indoor unit> Is there any mis-wiring, MXZ-2A20NA poor contact, or wire Is serial signal error indicated 6 minutes later? Correct them. disconnection of the MXZ-2A20NA - indoor/outdoor MXZ-3A30NA connecting wire? Outdoor electronic control P.C. board (Parts side) LED3 LED2 LED1 Blinking Turn OFF the power supply.
  • Page 62 The cooling operation or heating operation does not operate. (LED display: Both LED1 and LED2 lighting) C C Check of R.V. coil CN912 Noise filter P.C. board CN781 Outdoor electronic control P.C. board • When heating operation does not work. 1.
  • Page 63 • When cooling, heat exchanger of non-operating indoor unit frosts. • When heating, non-operating indoor unit get warm. D D Check of LEV Turn ON the power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely. Is "click - click"...
  • Page 64 • When heating, room does not get warm. • When cooling, room does not get cool. E E How to check inverter/ compressor Disconnect the terminal of the compressor. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION. W1 •...
  • Page 65 Fin temperature RT64 Between CN3 pin1 and pin2 Outdoor power board w Except MXZ-2A20NA - , MXZ-3A30NA - and MXZ-4A36NA. • 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 connectors CN931 and CN932.
  • Page 66 • When the operation frequency does not go up from lowest frequency. H H Check of HPS MXZ-3A30NA MXZ-3A30NA - MXZ-4A36NA 1. Disconnect the connector CN681 in the electronic control P.C. board. 2. Check the resistance of HPS after 1 minute has passed since the outdoor unit power supply was turned OFF. Infinity Check the resistance between Replace HPS.
  • Page 67 32 50 68 86 104 122 140 158 176 Temperature (˚F) 86 104 122 140 158 176 194 212 230 248 Temperature (˚F) Temperature (˚F) w Except MXZ-2A20NA - LED 1 LED 2 LED 3 CN603 Serial signal Room C...
  • Page 68 Defrost thermistor (RT61) Ambient temperature thermistor (RT65) MXZ-3A30NA - MXZ-4A36NA Fin temperature thermistor (RT64) Outdoor heat exchanger temperature thermistor (RT68) Discharge temperature thermistor (RT62) 10 20 30 40 50 60 70 80 Temperature (:) 100 110 120 Temperature (:) Temperature (:) LED 1 LED 2 LED 3...
  • Page 69 2. Noise filter P.C. board MXZ-2A20NA MXZ-2A20NA - MXZ-3A30NA CN901 To electronic CN902 CN903 To power To power control board board P.C. board 208/230V AC Input CN912 R.V. coil 208/230V AC 208/230V AC 208/230V AC Output Output F64 FUSE F911 FUSE...
  • Page 70 MXZ-2A20NA MXZ-2A20NA - MXZ-3A30NA MXZ-3A30NA - 3. Outdoor Power board MXZ-4A36NA Connect to the compressor Voltage among phases: 5V to 180V 294-370V DC Connect to the earth Output (Red) Connect to the controller board (–) (+)1-5(–): Signal transmission (To electronic control P.C. board)

  • Page 71: Disassembly Instructions

    (5)Disconnect the compressor lead wire from terminal of the panel compressor (U, V, W). (6)Disconnect the outdoor electronic control P.C. board connectors: CN661, CN662 (MXZ-2A20NA), CN663, CN791, CN792, Screw of CN795, CN931, CN932 the cabinet Disconnect the noise filter P.C. board connector:...
  • Page 72 OPERATING PROCEDURE PHOTOS Photo 3 Screw of the rear guard Screws of the back panel Photo 5 R.V. coil 4-way valve Screws of LEV coil E the back panel Expansion valve E Screws of the back panel Discharge pipe welded part Photo 4 Suction pipe welded part...
  • Page 73 OPERATING PROCEDURE PHOTOS 3. Removing the 4-way valve Photo 7 R.V. coil (1)Remove the top panel (Photo 1). (2)Remove the service panel, the cabinet and the back panel (Photo 1, 2, 3). Recover refrigerant gas. 4-way valve (3)Remove the electrical parts (Photo 4). (4)Detach the welded parts of 4-way valve and pipe.
  • Page 74 12-2. MXZ-3A30NA 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 (Photo 1). (2)Remove the screws of the service panel, and remove the service panel (Photo 1).
  • Page 75 OPERATING PROCEDURE PHOTOS Photo 4 2. Removing the fan motor Screws of the outdoor fan motor (1)Remove the top panel, the service panel, and the front panel (Photo 1). (2)Disconnect the connectors CN931 and CN932 on the outdoor electronic control P.C. board. (3)Remove the propeller.
  • Page 76 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 77 12-3. MXZ-3A30NA - MXZ-4A36NA OUTDOOR UNIT Photo : MXZ-3A30NA - OPERATING PROCEDURE PHOTOS Photo 1 Screws of the top panel 1. Removing the compressor (1)Remove the screws of the top panel, and remove the top panel. (2)Remove the screws of the service panel, and remove the ser- Screws of vice panel.
  • Page 78 Photo : MXZ-3A30NA - OPERATING PROCEDURE PHOTOS Photo 5 Screws of the outdoor fan motor 2. Removing the fan motor (1)Remove the top panel, the service panel, and the front panel (Photo 1, 2). (2)Disconnect the connectors CN931 and CN932 on the outdoor electronic control P.C.
  • Page 79 Photo : MXZ-3A30NA - OPERATING PROCEDURE PHOTOS 5. Removing the reactor Photo 8 (1)Remove the top panel (Photo 1, 2). (2)Disconnect the reactor lead wire. (3)Remove the screws of the reactor, and remove the reactor. Screws of the reactor...

  • Page 80: Parts List

    PARTS LIST (non-RoHS compliant) MXZ-2A20NA 13-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 5 6 7 8...
  • Page 81 PARTS LIST (non-RoHS compliant) MXZ-2A20NA 13-1. 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-2A20NA Diagram E02 939 232 CABINET E02 817 009...
  • Page 82 PARTS LIST (non-RoHS compliant) MXZ-2A20NA 13-2. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS...
  • Page 83 PARTS LIST (non-RoHS compliant) MXZ-2A20NA 13-2. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Q'ty/unit Symbol in Wiring Parts No. Parts Name Remarks MXZ-2A20NA Diagram E02 851 501 PROPELLER RC0J60- E02 A58 301 OUTDOOR FAN MOTOR E02 B05 440 POWER BOARD...
  • Page 84 PARTS LIST (non-RoHS compliant) MXZ-3A30NA 13-3. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 7 8 9...
  • Page 85 PARTS LIST (non-RoHS compliant) MXZ-3A30NA 13-3. 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-3A30NA Diagram M21 TK0 232 FRONT PANEL M21 TK0 027 HANDLE ASSEMBLY M21 TK5 010...
  • Page 86 PARTS LIST (non-RoHS compliant) MXZ-3A30NA 13-4. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS...
  • Page 87 PARTS LIST (non-RoHS compliant) MXZ-3A30NA 13-4. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Q'ty/unit Symbol in Wiring Parts No. Parts Name Remarks MXZ-3A30NA Diagram M21 TK0 501 PROPELLER T2W J7E 301 OUTDOOR FAN MOTOR RC0J60- T2W J7E 440 Including heat sink and RT64 POWER BOARD T2W J7E 451 ELECTRONIC CONTROL P.C.

  • Page 88: Rohs Parts List

    RoHS PARTS LIST (RoHS compliant) MXZ-2A20NA MXZ-2A20NA - 14-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 5 6 7 8...
  • Page 89 PARTS LIST (RoHS compliant) MXZ-2A20NA MXZ-2A20NA - 14-1. 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 MXZ- MXZ- Remarks 2A20NA 2A20NA -...
  • Page 90 RoHS PARTS LIST (RoHS compliant) MXZ-2A20NA MXZ-2A20NA - 14-2. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS...
  • Page 91 PARTS LIST (RoHS compliant) MXZ-2A20NA MXZ-2A20NA - 14-2. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Q'ty/unit Symbol in Wiring Parts No. Parts Name MXZ- Remarks MXZ- Diagram 2A20NA 2A20NA - E12 851 501 PROPELLER E12 A58 301 RC0J60- OUTDOOR FAN MOTOR...
  • Page 92 RoHS PARTS LIST (RoHS compliant) MXZ-3A30NA 14-3. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 7 8 9...
  • Page 93 PARTS LIST (RoHS compliant) MXZ-3A30NA 14-3. 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-3A30NA Diagram M21 L2V 232 FRONT PANEL M21 L2V 027 HANDLE ASSEMBLY M21 L2V 010...
  • Page 94 RoHS PARTS LIST (RoHS compliant) MXZ-3A30NA 14-4. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS...
  • Page 95 PARTS LIST (RoHS compliant) MXZ-3A30NA 14-4. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Q'ty/unit Symbol in Wiring Parts No. Parts Name Remarks MXZ-3A30NA Diagram M21 L2V 501 PROPELLER T2W L7V 301 OUTDOOR FAN MOTOR RC0J60- T2W L7V 440 POWER BOARD Including heat sink and RT64 T2W L7V 451 ELECTRONIC CONTROL P.C.
  • Page 96 RoHS PARTS LIST (RoHS compliant) MXZ-3A30NA - MXZ-4A36NA 14-5. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 8 9 10...
  • Page 97 RoHS PARTS LIST (RoHS compliant) MXZ-3A30NA - MXZ-4A36NA 14-5. 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-3A30NA - MXZ-4A36NA Diagram M21 0A2 232 FRONT PANEL M21 0A2 027...
  • Page 98 RoHS PARTS LIST (RoHS compliant) MXZ-3A30NA - MXZ-4A36NA 14-6. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS...
  • Page 99 RoHS PARTS LIST (RoHS compliant) MXZ-3A30NA - MXZ-4A36NA 14-6. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Q'ty/unit Symbol in Wiring Parts No. Parts Name Remarks MXZ-3A30NA - MXZ-4A36NA Diagram M21 L2V 501 PROPELLER T2W L7V 301 OUTDOOR FAN MOTOR PM8H60- M21 0A1 440 POWER BOARD Including heat sink and RT64...

  • Page 100: Optional Parts

    OPTIONAL PARTS 15-1. Different-diameter pipe Unit : inch MXZ-2A20NA MXZ-2A20NA - Connected pipes Length Length Length Model name MXZ-3A30NA diameter MXZ-3A30NA - MXZ-4A36NA MAC-A454JP {3/8 — {1/2 2.72 {3/8 {1/2 MAC-A455JP {1/2 — {3/8 {1/2 {3/8 2.56 For different- diameter MAC-A456JP {1/2 —...
  • Page 102 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN C C Copyright 2006 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Oct. 2007. No. OB444 REVISED EDITION-C 9 Distributed in May 2007. No. OB444 REVISED EDITION-B 9 Distributed in Jun. 2006. No. OB444 REVISED EDITION-A 8 Distributed in Mar.

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