Mitsubishi Electric MXZ-3C30NA Service Manual
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Mitsubishi Electric MXZ-3C30NA Service Manual

Outdoor unit
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Table of Contents

OUTDOOR UNIT
INDOOR UNIT
SERVICE MANUAL
Models
MXZ-3C24NA
MXZ-3C30NA
MXZ-4C36NA
MXZ-5C42NA
MXZ-2C20NAHZ MXZ-2C20NAHZ2
MXZ-3C24NAHZ MXZ-3C24NAHZ2
MXZ-3C30NAHZ MXZ-3C30NAHZ2
MXZ-3C24NA MXZ-3C24NA2
MXZ-3C30NA MXZ-3C30NA2
MXZ-4C36NA MXZ-4C36NA2
MXZ-3C24NA2
MXZ-3C30NA2
MXZ-4C36NA2
MXZ-5C42NA2
CONTENTS
10. SERVICE FUNCTIONS ···································· 66
11. TROUBLESHOOTING ····································· 68
12. DISASSEMBLY INSTRUCTIONS ···················· 89
PARTS CATALOG (OBB702)
Revision E:
• Capacity and input curve have been corrected.
OBH702 REVISED EDITION-D is void.
HFC
utilized
REVISED EDITION-E
R410A
Indoor unit service manual
-
U1
MSZ-FE·NA Series (OBH542)
-
MSZ-GE·NA Series (OBH548)
U1
MFZ-KA·NA Series (OBH568)
-
U1
SEZ-KD·NA Series
-
PLA-A·BA Series (OCH420)
U1
PCA-A·KA Series (OCH455)
-
U1
PEAD-A·AA Series
-
U1
SLZ-KA·NA Series (OCH487)
MSZ-FH·NA Series (OBH683)
-
U1
MVZ-A·AA Series
MSZ-GL·NA Series (OBH732)
MSZ-EF·NA Series (OBH736)
MFZ-KJ·NA Series (OBH752)
1. TECHNICAL CHANGES ··································· 5
2. PART NAMES AND FUNCTIONS ····················· 6
3. SPECIFICATION ················································ 7
4. NOISE CRITERIA CURVES ···························· 14
5. OUTLINES AND DIMENSIONS ······················ 16
6. WIRING DIAGRAM ·········································· 21
7. REFRIGERANT SYSTEM DIAGRAM ············· 31
8. DATA ································································ 42
9. ACTUATOR CONTROL ··································· 65
No. OBH702
TM

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Do you have a question about the MXZ-3C30NA and is the answer not in the manual?

Questions and answers

Kathie Klopfer
January 23, 2025

Is this MXZ-3C 30 NA efficient in heating in temperatures below 25 degrees?

0
1 comments:
Mr. Anderson
February 10, 2025

Yes, the Mitsubishi Electric MXZ-3C30NA is designed to operate efficiently in heating mode at low temperatures. It has a low-temperature heating mode that functions at 17°F outdoor temperature with a wet-bulb temperature of 15°F at rated compressor speed. Additionally, the unit includes frost accumulation management at 35°F outdoor temperature, ensuring continued operation in cold conditions. Therefore, it is capable of heating efficiently in temperatures below 25°F.

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Summary of Contents for Mitsubishi Electric MXZ-3C30NA

  • Page 1: Table Of Contents

    6. WIRING DIAGRAM ·········································· 21 7. REFRIGERANT SYSTEM DIAGRAM ············· 31 8. DATA ································································ 42 9. ACTUATOR CONTROL ··································· 65 10. SERVICE FUNCTIONS ···································· 66 11. TROUBLESHOOTING ····································· 68 12. DISASSEMBLY INSTRUCTIONS ···················· 89 PARTS CATALOG (OBB702) MXZ-3C24NA MXZ-3C24NA2 MXZ-3C30NA MXZ-3C30NA2 MXZ-4C36NA MXZ-4C36NA2...
  • Page 2 We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions. Revision A: • MXZ-3C24NA, MXZ-3C30NA and MXZ-4C36NA have been added. Revision B: • MXZ-3C24/3C30/4C36/5C42NA2 and MXZ-2C20/3C24/3C30NAHZ2- have been added.
  • Page 3 PEAD-A**AA PEAD-A**AA Ceiling suspended PCA-A**KA Ceiling suspended PCA-A**KA Multi-position MVZ-A**AA4 Multi-position MVZ-A**AA4 MXZ-3C30NA MXZ-3C30NA2-U1 Connectable indoor unit lineups (Heat pump inverter type) Connectable indoor unit lineups (Heat pump inverter type) Capacity class [kBTU/h] Capacity class [kBTU/h] Model type Model name...
  • Page 4 MXZ-3C24NA MXZ-3C24NA2-U1 Connectable indoor unit lineups (Heat pump inverter type) Connectable indoor unit lineups (Heat pump inverter type) Capacity class [kBTU/h] Capacity class [kBTU/h] Model type Model name Model type Model name MSZ-FE**NA MSZ-FE**NA MSZ-FH**NA MSZ-FH**NA Wall mounted Wall mounted MSZ-GE**NA MSZ-GE**NA MSZ-GL**NA...

  • Page 5: Technical Changes

    TECHNICAL CHANGES MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ 1. New model MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA 1. New model MXZ-3C24NA MXZ-3C24NA2 - MXZ-3C30NA MXZ-3C30NA2 - MXZ-4C36NA MXZ-4C36NA2 - MXZ-5C42NA MXZ-5C42NA2 - MXZ-2C20NAHZ MXZ-2C20NAHZ2 - MXZ-3C24NAHZ MXZ-3C24NAHZ2 - MXZ-3C30NAHZ MXZ-3C30NAHZ2 - 1. Outdoor control P.C. board has been changed.

  • Page 6: Part Names And Functions

    PART NAMES AND FUNCTIONS MXZ-3C24NA MXZ-3C24NA2 MXZ-3C30NA MXZ-3C30NA2 MXZ-4C36NA MXZ-4C36NA2 Air inlet (Back and side) Air outlet Drain outlet MXZ-5C42NA MXZ-5C42NA2 MXZ-2C20NAHZ MXZ-2C20NAHZ2 MXZ-3C24NAHZ MXZ-3C24NAHZ2 MXZ-3C30NAHZ MXZ-3C30NAHZ2 Air inlet (Back and side) Air outlet Drain outlet OBH702E...

  • Page 7: Specification

    SPECIFICATION MXZ-3C24NA MXZ-3C24NA2 Outdoor model Item Indoor type Non-Duct (06+09+09) Duct (09+09+09) Cooling Btu/h 22,000 23,600 Capacity Heating 47 Btu/h 25,000 24,600 19,600 19,600 Heating 17 Btu/h 1,620 2,100 Cooling Power 1,750 1,900 Heating 47 consumption Heating 17 2,580 2,440 Cooling 13.6 11.2...
  • Page 8 MXZ-3C30NA MXZ-3C30NA2 Outdoor model Item Indoor type Non-Duct (09+09+12) Duct (09+09+12) Cooling Btu/h 28,400 27,400 Capacity Heating 47 Btu/h 28,600 27,600 21,000 21,000 Heating 17 Btu/h 2,680 2,840 Cooling Power 2,150 2,220 Heating 47 consumption Heating 17 2,740 2,820 Cooling 10.6...
  • Page 9 MXZ-4C36NA MXZ-4C36NA2 Outdoor model Item Indoor type Non-Duct (09+09+09+09) Duct (09+09+09+09) Cooling Btu/h 35,400 34,400 Capacity Heating 47 Btu/h 36,000 34,400 26,600 26,600 Heating 17 Btu/h 3,760 3,940 Cooling Power 3,020 3,100 Heating 47 consumption Heating 17 3,440 3,540 Cooling SEER Cooling 19.2...
  • Page 10 MXZ-5C42NA MXZ-5C42NA2 Outdoor model Item Indoor type Non-Duct (06+09+09+09+09) Duct (09+09+09+09+09) Cooling Btu/h 40,500 37,500 Capacity Heating 47 Btu/h 45,000 41,000 30,500 29,100 Heating 17 Btu/h 4,403 4,112 Cooling Power 3,575 3,463 Heating 47 consumption Heating 17 4,800 5,500 Cooling SEER Cooling 19.7...
  • Page 11 MXZ-2C20NAHZ MXZ-2C20NAHZ2 Outdoor model Item Indoor type Non-Duct (09+09) Duct (09+12) Cooling Btu/h 18,000 20,000 Capacity Heating 47 Btu/h 22,000 22,000 22,000 22,000 Heating 17 Btu/h 1,334 1,819 Cooling Power 1,612 1,748 Heating 47 consumption Heating 17 3,071 3,224 Cooling 13.5 11.0 SEER...
  • Page 12 MXZ-3C24NAHZ MXZ-3C24NAHZ2 Outdoor model Item Indoor type Non-Duct (06+06+09) Duct (09+09+09) Cooling Btu/h 22,000 23,600 Capacity Heating 47 Btu/h 25,000 24,600 25,000 24,600 Heating 17 Btu/h 1,630 2,360 Cooling Power 1,725 1,871 Heating 47 consumption Heating 17 3,557 3,795 Cooling 13.5 10.0 SEER...
  • Page 13 MXZ-3C30NAHZ MXZ-3C30NAHZ2 Outdoor model Item Indoor type Non-Duct (09+09+12) Duct (09+09+12) Cooling Btu/h 28,400 27,400 Capacity Heating 47 Btu/h 28,600 27,600 28,600 27,600 Heating 17 Btu/h 2,272 2,661 Cooling Power 2,096 2,187 Heating 47 consumption Heating 17 4,192 4,258 Cooling 12.5 10.3 SEER...

  • Page 14: Noise Criteria Curves

    NOISE CRITERIA CURVES MXZ-3C24NA MXZ-3C30NA MXZ-3C24NA2 MXZ-3C30NA2 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 THRESHOLD OF THRESHOLD OF...
  • Page 15 MXZ-5C42NA MXZ-2C20NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 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 THRESHOLD OF THRESHOLD OF HEARING FOR HEARING FOR NC-20 NC-20...

  • Page 16: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MXZ-3C24NA MXZ-3C24NA2 Unit: inch (mm) MXZ-3C30NA MXZ-3C30NA2 Conduit plates Conduit connector Lock nut OBH702E...
  • Page 17 Unit: inch (mm) MXZ-4C36NA MXZ-4C36NA2 Conduit plates Conduit connector Lock nut OBH702E...
  • Page 18 Unit: inch (mm) MXZ-5C42NA MXZ-5C42NA2 Conduit plate Top Conduit connector Lock nut Conduit plate Under OBH702E...
  • Page 19 Unit: inch (mm) MXZ-2C20NAHZ MXZ-2C20NAHZ2 Lock nut Conduit plate Conduit connector OBH702E...
  • Page 20 MXZ-3C24NAHZ MXZ-3C24NAHZ2 Unit: inch (mm) MXZ-3C30NAHZ MXZ-3C30NAHZ2 Lock nut Conduit plate Top Conduit connector Conduit plate Under OBH702E...

  • Page 21: Wiring Diagram

    WIRING DIAGRAM MXZ-3C24NA MXZ-3C30NA OBH702E...
  • Page 22 MXZ-3C24NA2 MXZ-3C30NA2 OBH702E...
  • Page 23 MXZ-4C36NA OBH702E...
  • Page 24 MXZ-4C36NA2 OBH702E...
  • Page 25 MXZ-5C42NA CIRCUIT BREAKER TAB5 TAB3 TAB6 TAB4 X52CA TAB1 POWER SUPPLY 208/230V IC501 IC411 IC401 X52CB 1 phase 60Hz GRN/YLW TAB2 X65A PTC1 PTC2 PTC3 12-24V TO INDOOR ~208/230V UNIT No. E OUTDOOR CNAC1 POWER P.C. BOARD 12-24V CN151 CN152 TO INDOOR CNDC CNAC2...
  • Page 26 MXZ-5C42NA2 OBH702E...
  • Page 27 MXZ-2C20NAHZ OBH702E...
  • Page 28 MXZ-2C20NAHZ2 OBH702E...
  • Page 29 MXZ-3C24NAHZ MXZ-3C30NAHZ OBH702E...
  • Page 30 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 OBH702E...

  • Page 31: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MXZ-3C24NA MXZ-3C24NA2 Unit: inch (mm) MXZ-3C30NA MXZ-3C30NA2 R.V.coil Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Service port High pressure switch Compressor shell Muffler temperature thermistor Service port RT62 Union Header(Gas) Stop valve Indoor unit A...
  • Page 32 Operating Range MXZ-3C24NA MXZ-3C30NA MXZ-3C24NA2 MXZ-3C30NA2 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 6°FDB, 5°FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION...
  • Page 33 MXZ-4C36NA MXZ-4C36NA2 Unit: inch (mm) R.V.coil Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Service port High pressure switch Compressor shell Muffler temperature thermistor Service port RT62 Union Header(Gas) Stop valve 4-way valve Indoor unit A (with service port) Indoor unit B Header (Evaporator) muffler...
  • Page 34 Operating Range MXZ-4C36NA MXZ-4C36NA2 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 6°FDB, 5°FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-4C36NA MXZ-4C36NA2 Piping length each indoor unit (a, b, c, d) 82 ft.
  • Page 35 Unit: inch (mm) MXZ-5C42NA R.V.coil Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Compressor shell Service port temperature Oil separator thermistor RT62 High pressure switch Union Service port Header(Gas) Ø1/2 Indoor unit A 4-way valve Ø3/8 Indoor unit B Stop valve Header(Evaporator) Ø3/8...
  • Page 36 Operating Range MXZ-5C42NA MXZ-5C42NA2 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 6°FDB, 5°FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-5C42NA MXZ-5C42NA2 Piping length each indoor unit (a, b, c, d, e) 82 ft.
  • Page 37 Unit: inch (mm) MXZ-2C20NAHZ R.V.coil Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Compressor shell Service port temperature Oil separator thermistor RT62 High pressure switch Union Header(Gas) Service port Ø3/8 Indoor unit A 4-way valve Stop valve Header(Evaporator) (with service port) Outdoor Capillary tube...
  • Page 38 Operating Range MXZ-2C20NAHZ MXZ-2C20NAHZ2 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 -12°FDB, -13°FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-2C20NAHZ MXZ-2C20NAHZ2 Piping length each indoor unit (a, b) 82 ft.
  • Page 39 Unit: inch (mm) MXZ-3C24NAHZ MXZ-3C30NAHZ R. V. coil Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Compressor shell Service port temperature Oil separator thermistor RT62 High pressure switch Union Header(Gas) Service port Ø1/2 4-way valve Indoor unit A Stop valve Header(Evaporator) Ø3/8...
  • Page 40 Operating Range MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 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 -12°FDB, -13°FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 Piping length each indoor unit (a, b, c) 82 ft.
  • Page 41 PUMPING DOWN When relocating or disposing of the air conditioner, pump down the system following the procedure below so that no refriger- ant is released into the atmosphere. 1) Turn off the breaker. 2) Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit. 3) Fully close the stop valve on the liquid pipe side of the outdoor unit.

  • Page 42: Data

    Refrigerant charge (R410A) – 6lb. 13 oz. Outdoor Intake air temperature ºF unit ºF Fan speed Airfl ow 2,287 2,382 2,287 2,382 Model MXZ-3C30NA MXZ-3C30NA2 Indoor type Non-Duct (09+09+12) Duct (09+09+12) Item Unit Cooling Heating Cooling Heating Total Capacity Btu/h 28,400 28,600...
  • Page 43 Model MXZ-4C36NA MXZ-4C36NA2 Indoor type Non-Duct (09+09+09+09) Duct (09+09+09+09) Item Unit Cooling Heating Cooling Heating Total Capacity Btu/h 35,400 36,000 34,400 34,400 – – – – – Input 3.76 3.02 3.94 3.10 Electrical Power supply (V, phase, Hz) 208/230, 1, 60 circuit Input 3.672...
  • Page 44 MXZ-5C42NA MXZ-5C42NA2 Model Indoor type Non-Duct (06+09+09+09+09) Duct (09+09+09+09+09) Item Unit Cooling Heating Cooling Heating Capacity Btu/h 40,500 45,000 37,500 41,000 Total Input 4.41 3.58 4.17 3.47 Power supply (V, phase, Hz) 208/230, 1, 60 Input 4.300 3.465 3.870 3.270 Electrical circuit Comp.
  • Page 45 MXZ-3C24NAHZ MXZ-3C24NAHZ2 Model Indoor type Non-Duct (06+06+09) Duct (09+09+09) Item Unit Cooling Heating Cooling Heating Capacity Btu/h 22,000 25,000 23,600 24,600 Total Input 1.63 1.73 2.36 1.88 Power supply (V, phase, Hz) 208/230, 1, 60 Input 1.564 1.661 2.180 1.760 Electrical circuit Comp.
  • Page 46 8-1. OPERATING RANGE (1) POWER SUPPLY Model Rating Guaranteed Voltage MXZ-3C24NA MXZ-3C30NA MXZ-2C20NAHZ MXZ-4C36NA MXZ-3C24NAHZ MXZ-5C42NA MXZ-3C30NAHZ Outdoor unit 208/230 V 60 Hz 1ø MXZ-3C24NA2 MXZ-2C20NAHZ2 MXZ-3C30NA2 MXZ-3C24NAHZ2 MXZ-4C36NA2 MXZ-3C30NAHZ2 MXZ-5C42NA2 (2) OPERATION Intake air Indoor Outdoor temperature Function Condition DB (°F)
  • Page 47 MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 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 48 8-2. CAPACITY AND THE INPUT CURVES MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 Cooling capacity 11.7 11.4 14.5 13.2 10.7 10.5 13.2 12.1 12.0 10.9 10.7 Outdoor intake air Dry-bulb temperature (°F) Total input (Cooling) 11.7 11.4 14.5 13.2 10.7 10.5 13.2...
  • Page 49 MXZ-5C42NA MXZ-5C42NA2 Cooling capacity 11.7 11.4 14.5 13.2 10.7 10.5 13.2 12.1 12.0 10.9 10.7 Outdoor intake air Dry-bulb temperature (°F) Total input (Cooling) 11.7 11.4 14.5 13.2 10.7 10.5 13.2 12.1 12.0 10.9 10.7 Outdoor intake air Dry-bulb temperature (°F) Heating capacity 26.1 36.7...
  • Page 50 MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 Cooling capacity 11.7 11.4 14.5 13.2 10.7 10.5 13.2 12.1 12.0 10.9 10.7 Outdoor intake air Dry-bulb temperature (°F) Total input (Cooling) 11.7 11.4 14.5 13.2 10.7 10.5 13.2 12.1 12.0 10.9 10.7 Outdoor intake air Dry-bulb temperature (°F) Heating capacity 26.1 36.7...
  • Page 51 8-3. CAPACITY AND INPUT CORRECTION BY MEANS OF INVERTER OUTPUT FREQUENCY (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) 1. 06-class unit in single operation <HEAT>Total input <COOL>Capacity <COOL>Total input <HEAT>Capacity Frequency Frequency Frequency Frequency 2. 09-class unit in single operation <HEAT>Capacity...
  • Page 52 (OUTDOOR UNIT: MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2) 1. 06-class unit in single operation <HEAT>Total input <COOL>Capacity <COOL>Total input <HEAT>Capacity Frequency Frequency Frequency Frequency 2. 09-class unit in single operation <HEAT>Capacity <HEAT>Total input <COOL>Total input <COOL>Capacity Frequency Frequency Frequency Frequency 3.
  • Page 53 8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT 1. 06-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1.
  • Page 54 2. 09-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
  • Page 55 3. 12-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
  • Page 56 4. 15-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
  • Page 57 5. 18-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
  • Page 58 6. 24-class unit in single operation (OUTDOOR UNIT: MXZ-3C30NA MXZ-4C36NA MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
  • Page 59 7. 06-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
  • Page 60 8. 09-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
  • Page 61 9. 12-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
  • Page 62 10. 15-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
  • Page 63 11. 18-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
  • Page 64 12. 24-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-3C30NAHZ2) (1) COOL operation(1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.

  • Page 65: Actuator Control

    ACTUATOR CONTROL MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 Relation between main sensor and actuator Actuator 2-way solenoid Defrost valve heater (MXZ-5C42NA MXZ-2C20NAHZ (MXZ-2C20NAHZ Sensor Purpose Outdoor MXZ-3C24NAHZ MXZ-3C24NAHZ Compressor 4-way valve fan motor...

  • Page 66: Service Functions

    SERVICE FUNCTIONS MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 10-1. PRE-HEAT CONTROL If moisture gets into the refrigerant cycle, or when refrigerant is liquefied and collected in the compressor, it may interfere the startup of the compressor.
  • Page 67 10-2. AUTO LINE CORRECTING 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. This will be completed in about 10 to 20 minutes.

  • Page 68: Troubleshooting

    TROUBLESHOOTING MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 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 miswiring. 2. Take care of the following during servicing.
  • Page 69 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Check if outdoor unit is abnormal according to the following procedures. Make sure that the remote controller is set to the failure mode recall function. 1 Regardless of normal or abnormal condition, 2 short beeps are emitted as the signal is received.
  • Page 70 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (11-4.). 3. Table of outdoor unit failure mode recall function LED indication The left lamp of Indoor/ (Outdoor P.C. OPERATION IN- Abnormal point outdoor unit Condition Remedy board) DICATOR lamp...
  • Page 71 11-3. INSTRUCTION OF 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. Operation start Check the outdoor unit LED indicator.
  • Page 72 11-4. TROUBLESHOOTING CHECK TABLE Indication Abnormal point / Con- Symptom Condition Remedy dition LED1(Red) LED2(Yellow) Outdoor The indoor unit detects an abnormality in the LEV • Refer to 11-6. "Check of LEV". Lighted Once LEV and drain pump unit does and drain pump.
  • Page 73 Indication Abnormal point / Con- Symptom Condition Remedy dition LED1(Red) LED2(Yellow) 21 'Outdoor unit Low out side tempera- The ambient became 10.4°F or less. stops and ture protection(cooling) restarts The ambient became 1.4°F or less. (MXZ-3C24/ 3 minutes 11 times Not lighted 3C30/4C36/5C42NA, MXZ-3C24/3C30/4C36/ —...
  • Page 74 11-5. TROUBLE CRITERION OF MAIN PARTS MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 Part name Check method and criterion Defrost thermistor (RT61) Fin temperature Measure the resistance with a tester. thermistor (RT64) Ambient temperature Refer to 11-7.
  • Page 75 11-6. TROUBLESHOOTING FLOW Outdoor unit does not operate. Check of power supply Check the main power supply circuit for proper connections. Turn ON the power supply. Is there voltage of 208/230 V AC in the Check the power supply cable. power supply terminal block? Is the output voltage from the outdoor Replace the outdoor control P.C.
  • Page 76 • 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. How to check miswiring and serial signal error (when outdoor unit does not work) Turn OFF the power supply.
  • Page 77 The cooling operation or heating operation does not operate. Check of R.V. coil CNAC Outdoor control CN712 P.C. board 1. Disconnect the lead wire leading to the compressor. Outdoor power 2. 3 minutes after turning ON the power supply, start EMERGENCY CNAC2 P.C.
  • Page 78 • When cooling, heat exchanger of non-operating indoor unit frosts. • When heating, non-operating indoor unit gets warm. Check of LEV CN791 Turn ON the power supply to the outdoor unit after checking LEV coil is CN792 Outdoor mounted to the LEV body securely. CN793 control CN794...
  • Page 79 • When heating, room does not get warm. • When cooling, room does not get cool. How to check inverter/compressor Disconnect the terminal of the compressor or the connector (CNMC) between the compressor and the outdoor power P.C. board. 3 minutes after the power supply is turned ON, start EMERGENCY OPERATION.
  • Page 80 • When thermistor is abnormal. Check of outdoor thermistors (MXZ-3C24/3C30/4C36NA, MXZ-3C24/3C30/4C36NA2) Disconnect the connector in the following table and Abnormal measure the resistance of the thermistor to check Replace the thermistor. whether the thermistor is normal or not. (Refer to 11-7.) (MXZ-5C42NA,MXZ-5C42NA2, Normal MXZ-2C20/3C24/3C30NAHZ,...
  • Page 81 • Fan motor does not operate or stops operating shortly after starting the operation. Check of outdoor fan motor Disconnect CNF1 and measure the CNF1 Outdoor control resistance of the outdoor fan motor. P.C. board Is the resistance of outdoor fan motor Measuring points Resistance Replace the outdoor fan motor.
  • Page 82 • When the operation frequency does not go up from the lowest frequency. Outdoor control Check of HPS CN63H P.C. board 1. Disconnect the connector CN63H in the outdoor 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 Replace HPS.
  • Page 83 Discharge temperature thermistor (RT62) 11-7. TEST POINT DIAGRAM AND VOLTAGE Ambient temperature thermistor (RT65) 1. Outdoor control P.C. board Outdoor heat exchanger temperature thermistor (RT68) MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA 100 110 120 (ºC) (ºF) 104 122 140 158 176 194 212 230 248 Temperature Thermistor R100 = 13.36 k ±...
  • Page 84 Defrost thermistor (RT61) Discharge temperature thermistor (RT62) 1. Outdoor control P.C. board Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature MXZ-5C42NA thermistor (RT68) MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ 100 110 120 (ºC) (ºF) 104 122 140 158 176 194 212 230 248 Temperature Thermistor R100 = 13.36 k ±...
  • Page 85 Defrost thermistor (RT61) Discharge temperature thermistor (RT62) 1. Outdoor control P.C. board Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature MXZ-3C24NA2 MXZ-3C30NA2 thermistor (RT68) MXZ-4C36NA2 100 110 120 (ºC) (ºF) 104 122 140 158 176 194 212 230 248 Temperature Thermistor R100 = 13.36 k ±...
  • Page 86 Defrost thermistor (RT61) Discharge temperature thermistor (RT62) 1. Outdoor control P.C. board Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature MXZ-5C42NA2 thermistor (RT68) MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 100 110 120 (ºC) (ºF) 104 122 140 158 176 194 212 230 248 Temperature Thermistor R100 = 13.36 k ±...
  • Page 87 2. Outdoor power P.C. board MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 Output to drive compressor CN171 Fin temperature thermistor CN152 (RT64) Signal Transmission (From Outdoor Control P.C. board) 5 VDC pulse wave Connect to earth CNAC2 208/230 V AC Output F1 FUSE T6.3AL250V...
  • Page 88 2. Outdoor power P.C. board MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 CNDC Bus-bar voltage 290 - 370 V DC CN171 Output to drive compressor CNAC1 Connect to earth Fin temperature thermistor 208/230 V Output (RT64) F1 FUSE T6.3AL250V CN152 F2 FUSE Signal...

  • Page 89: Disassembly Instructions

    Hold the sleeve, and Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 12-1. MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 Photos: MXZ-4C36NA MXZ-4C36NA2 NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS Photo 1 1.
  • Page 90 OPERATING PROCEDURE PHOTOS 2. Removing the outdoor control P.C. board, the reac- Photo 4 tor and the outdoor power P.C. board Catches of the PB cover (1) Remove the top panel and the service panel (Refer to 1). (2) Disconnect the power supply and indoor/outdoor connect- ing wire.
  • Page 91 OPERATING PROCEDURE PHOTOS 3. Removing the fan motor Photo 7 (1) Remove the top panel, the service panel, and the front panel (Refer to 1). Propeller fan (2) Disconnect the power supply and indoor/outdoor connect- ing wire. (3) Disconnect the connector CNF1 on the outdoor control P.C. board.
  • Page 92 OPERATING PROCEDURE PHOTOS 5. Removing the expansion valve Photo 9 (1) Remove the top panel, and the service panel (Refer to 1). (2) Disconnect the power supply and indoor/outdoor connect- ing wire. (Gas recovery is not required if the unit is pumped down.) (3) Remove the LEV coils.
  • Page 93 12-2. MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 Photos: MXZ-3C30NAHZ MXZ-3C30NAHZ2 NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS Photo 1 1. Removing the panels Screws of the top panel (1) Remove the screws fixing the top panel, and remove the top panel.
  • Page 94 OPERATING PROCEDURE PHOTOS Screw 2. Removing the outdoor control P.C. board, the reac- Photo 4 of the tor and the outdoor power P.C. board electrical (1) Remove the top panel, the service panel and the front parts panel (Refer to 1). (2) Disconnect the power supply and indoor/outdoor connect- Screws ing wire.
  • Page 95 OPERATING PROCEDURE PHOTOS 3. Removing the fan motor Photo 9 (1) Remove the top panel, the service panel, and the front Screw of the panel (Refer to 1). Screws of the outdoor fan motor VB fixture (2) Disconnect the power supply and indoor/outdoor connect- ing wire.
  • Page 96 LEV coils valves HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2014 MITSUBISHI ELECTRIC CORPORATION Issued: Dec. 2016. No. OBH702 REVISED EDITION-E Issued: Jul. 2016. No. OBH702 REVISED EDITION-D Issued: Mar. 2016. No. OBH702 REVISED EDITION-C Issued: Feb.

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