Mitsubishi Electric MXZ-2C20NA2-U1 Service Manual
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Mitsubishi Electric MXZ-2C20NA2-U1 Service Manual

Outdoor unit
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INDOOR UNIT
SERVICE MANUAL
Models
MXZ-2C20NA2
MXZ-3C24NA
MXZ-3C30NA
MXZ-4C36NA
MXZ-5C42NA
MXZ-2C20NAHZ MXZ-2C20NAHZ2
MXZ-3C24NAHZ MXZ-3C24NAHZ2
MXZ-3C30NAHZ MXZ-3C30NAHZ2
-
U1
MXZ-3C24NA2
MXZ-3C30NA2
MXZ-4C36NA2
MXZ-5C42NA2
Revision G:
• 4. NOISE CRITERIA CURVES has been changed.
OBH702 REVISED EDITION-F is void.
HFC
utilized
REVISED EDITION-G
R410A
Indoor unit service manual
MSZ-FE·NA Series (OBH542)
MSZ-FH·NA Series (OBH683)
MSZ-GE·NA Series (OBH548)
MSZ-GL·NA Series (OBH732)
-
U1
MSZ-EF·NA Series (OBH736)
-
U1
MFZ-KA·NA Series (OBH568)
-
MFZ-KJ·NA Series (OBH752)
U1
SLZ-KA·NA Series (OCH487)
-
U1
SLZ-KF·NA.TH Series
-
U1
PLA-A·BA Series (OCH420)
-
U1
PLA-A·EA Series (OCH640)
-
U1
SEZ-KD·NA Series
PEAD-A·AA Series
PCA-A·KA Series (OCH455)
MVZ-A·AA Series
SVZ-KP·NA Series
CONTENTS
1. TECHNICAL CHANGES ··································· 5
2. PART NAMES AND FUNCTIONS····················· 6
3. SPECIFICATION················································ 7
4. NOISE CRITERIA CURVES ···························· 15
5. OUTLINES AND DIMENSIONS ······················ 17
6. WIRING DIAGRAM·········································· 23
7. REFRIGERANT SYSTEM DIAGRAM ············· 34
8. DATA································································ 47
9. ACTUATOR CONTROL··································· 76
10. SERVICE FUNCTIONS···································· 77
11. TROUBLESHOOTING ····································· 79
12. DISASSEMBLY INSTRUCTIONS·················· 102
PARTS CATALOG (OBB702)
No. OBH702
(OCH669)
TM
Table of Contents
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Summary of Contents for Mitsubishi Electric MXZ-2C20NA2-U1

  • Page 1: Service Manual

    Revision G: • 4. NOISE CRITERIA CURVES has been changed. OBH702 REVISED EDITION-F is void. INDOOR UNIT OUTDOOR UNIT No. OBH702 utilized REVISED EDITION-G SERVICE MANUAL R410A Indoor unit service manual Models MSZ-FE·NA Series (OBH542) MSZ-FH·NA Series (OBH683) MXZ-2C20NA2 MSZ-GE·NA Series (OBH548) MXZ-3C24NA MXZ-3C24NA2 MSZ-GL·NA Series (OBH732)
  • Page 2 Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.
  • Page 3 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 MSZ-FH**NA2 MSZ-FH**NA2 Wall mounted Wall mounted MSZ-GE**NA MSZ-GE**NA MSZ-GL**NA-U1...
  • Page 4 Ceiling concealed PEAD-A**AA5 PEAD-A**AA5 Ceiling suspended PCA-A**KA6.TH Ceiling suspended PCA-A**KA6.TH MVZ-A**AA4 MVZ-A**AA4 Multi-position Multi-position SVZ-KP**NA SVZ-KP**NA Connectable indoor unit lineups(Heat pump inverter type) Capacity class [kBTU/h] Model type Model name MSZ-FE**NA MSZ-FH**NA MSZ-FH**NA2 Wall mounted MSZ-GE**NA MSZ-GL**NA-U1 MSZ-EF**NA-U1 MFZ-KA**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. MXZ-2C20NA2 - 1.

  • Page 6: Part Names And Functions

    PART NAMES AND FUNCTIONS MXZ-2C20NA2 MXZ-3C24NA MXZ-3C24NA2 MXZ-3C30NA MXZ-3C30NA2 MXZ-4C36NA MXZ-4C36NA2 Air inlet (Back and side) Air inlet (Back and side) Air outlet Air outlet Drain 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 OBH702G...

  • Page 7: Specification

    SPECIFICATION Outdoor model MXZ-2C20NA2 Item Non-Duct (09+09) Duct (09+12) Indoor type 18,000 20,000 Cooling Btu/h 22,000 22,000 Capacity Heating 47 Btu/h Heating 17 Btu/h 1,2500 13,500 Cooling 1,417 2,000 Power Heating 47 1,641 1,771 consumption Heating 17 1,300 1,350 Cooling 12.7 10.0 SEER...
  • Page 8 Outdoor model MXZ-3C24NA MXZ-3C24NA2 Item Non-Duct (06+09+09) Duct (09+09+09) Indoor type 22,000 23,600 Cooling Btu/h 25,000 24,600 Capacity Heating 47 Btu/h Heating 17 Btu/h 19,600 19,600 Cooling 1,620 2,100 Power Heating 47 1,750 1,900 consumption Heating 17 2,580 2,440 Cooling 13.6 11.2 SEER...
  • Page 9 Outdoor model MXZ-3C30NA MXZ-3C30NA2 Item Non-Duct (09+09+12) Duct (09+09+12) Indoor type 28,400 27,400 Cooling Btu/h 28,600 27,600 Capacity Heating 47 Btu/h Heating 17 Btu/h 21,000 21,000 Cooling 2,680 2,840 Power Heating 47 2,150 2,220 consumption Heating 17 2,740 2,820 Cooling 10.6 SEER Cooling...
  • Page 10 Outdoor model MXZ-4C36NA MXZ-4C36NA2 Item Non-Duct (09+09+09+09) Duct (09+09+09+09) Indoor type 35,400 34,400 Cooling Btu/h 36,000 34,400 Capacity Heating 47 Btu/h Heating 17 Btu/h 26,600 26,600 Cooling 3,760 3,940 Power Heating 47 3,020 3,100 consumption Heating 17 3,440 3,540 Cooling SEER Cooling 19.2...
  • Page 11 Outdoor model MXZ-5C42NA MXZ-5C42NA2 Item Non-Duct (06+09+09+09+09) Duct (09+09+09+09+09) Indoor type 40,500 37,500 Cooling Btu/h 45,000 41,000 Capacity Heating 47 Btu/h Heating 17 Btu/h 30,500 29,100 Cooling 4,403 4,112 Power Heating 47 3,575 3,463 consumption Heating 17 4,800 5,500 Cooling SEER Cooling 19.7...
  • Page 12 Outdoor model MXZ-2C20NAHZ MXZ-2C20NAHZ2 Item Non-Duct (09+09) Duct (09+12) Indoor type 18,000 20,000 Cooling Btu/h 22,000 22,000 Capacity Heating 47 Btu/h Heating 17 Btu/h 22,000 22,000 Cooling 1,334 1,819 Power Heating 47 1,612 1,748 consumption Heating 17 3,071 3,224 Cooling 13.5 11.0 SEER...
  • Page 13 Outdoor model MXZ-3C24NAHZ MXZ-3C24NAHZ2 Item Non-Duct (06+06+09) Duct (09+09+09) Indoor type 22,000 23,600 Cooling Btu/h 25,000 24,600 Capacity Heating 47 Btu/h Heating 17 Btu/h 25,000 24,600 Cooling 1,630 2,360 Power Heating 47 1,725 1,871 consumption Heating 17 3,557 3,795 Cooling 13.5 10.0 SEER...
  • Page 14 Outdoor model MXZ-3C30NAHZ MXZ-3C30NAHZ2 Item Non-Duct (09+09+12) Duct (09+09+12) Indoor type 28,400 27,400 Cooling Btu/h 28,600 27,600 Capacity Heating 47 Btu/h Heating 17 Btu/h 28,600 27,600 Cooling 2,272 2,661 Power Heating 47 2,096 2,187 consumption Heating 17 4,192 4,258 Cooling 12.5 10.3 SEER...

  • Page 15: Table Of Contents

    NOISE CRITERIA CURVES MXZ-3C24NA MXZ-2C20NA2 MXZ-3C24NA2 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 NC-20 HEARING FOR...

  • Page 16: Table Of Contents

    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 17: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MXZ-2C20NA2 Unit: inch (mm) 6-21/32” 19-11/16” 6-23/32” 2-9/16” 8-5/32” 12-3/8” Inlet Air Inlet 3-ø(1-5/16”) Drain hole Outlet 4-(13/32” 13/16”) Oval Hole (Foundation Bolt M8) 33-1/16” 1-3/16” Handle 7-7/8” 1-1/32” 13” 1/2” Connecting wire hole 2-19/32” Connecting wire hole Unit B LIQ 1/4”(ø6.35)FLARE GAS 3/8”(ø9.52)FLARE...
  • Page 18 Unit: inch (mm) MXZ-3C24NA MXZ-3C24NA2 MXZ-3C30NA MXZ-3C30NA2 Conduit plates Conduit connector Lock nut OBH702G...
  • Page 19 Unit: inch (mm) MXZ-4C36NA MXZ-4C36NA2 Conduit plates Conduit connector Lock nut OBH702G...
  • Page 20 Unit: inch (mm) MXZ-5C42NA MXZ-5C42NA2 Conduit plate Top Conduit connector Lock nut Conduit plate Under OBH702G...
  • Page 21 Unit: inch (mm) MXZ-2C20NAHZ MXZ-2C20NAHZ2 Lock nut Conduit plate Conduit connector OBH702G...
  • Page 22 Unit: inch (mm) MXZ-3C24NAHZ MXZ-3C24NAHZ2 MXZ-3C30NAHZ MXZ-3C30NAHZ2 Lock nut Conduit plate Top Conduit connector Conduit plate Under OBH702G...

  • Page 23: Wiring Diagram

    WIRING DIAGRAM MXZ-2C20NA2 CIRCUIT TB1 BREAKER X52C TAB1 TAB6 TAB5 TAB4 TAB3 POWER SUPPLY IC501 IC411 208/230V TAB2 IC402 IC401 GNYN AC 60Hz PTC1 PTC2 CNMC CNAC1 OUTDOOR POWER P.C. BOARD CN171 CNDC CN151 CN152 CNAC2 TBE4 TBE2 TBE1 RT64 t°...
  • Page 24 MXZ-3C24NA MXZ-3C30NA OBH702G...
  • Page 25 MXZ-3C24NA2 MXZ-3C30NA2 OBH702G...
  • Page 26 MXZ-4C36NA OBH702G...
  • Page 27 MXZ-4C36NA2 OBH702G...
  • Page 28 MXZ-5C42NA CIRCUIT BREAKER TAB5 TAB3 TAB6 TAB4 X52CA TAB1 POWER SUPPLY 208/230V IC411 IC501 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 29 MXZ-5C42NA2 OBH702G...
  • Page 30 MXZ-2C20NAHZ OBH702G...
  • Page 31 MXZ-2C20NAHZ2 OBH702G...
  • Page 32 MXZ-3C24NAHZ MXZ-3C30NAHZ OBH702G...
  • Page 33 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 OBH702G...

  • Page 34: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MXZ-2C20NA2 Unit: inch (mm) Service port Compressor R.V. coil Discharge Service temperature Refrigerant flow in cooling port thermistor RT62 Refrigerant flow in heating Muffler High pressure switch Union Indoor unit ø 3/8 Stop valve with 4-way service port valve Indoor unit ø...

  • Page 35: Outdoor Unit

    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-2C20NA2 Piping length each indoor unit (a, b) 82 ft.
  • Page 36 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) ø 1/2 Stop valve Indoor unit A 4-way valve (with service port) ø...
  • Page 37 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 MXZ-3C24NA MXZ-3C30NA MXZ-3C24NA2 MXZ-3C30NA2 Piping length each indoor unit (a, b, c) 82 ft.
  • Page 38 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 ø 1/2 4-way valve Indoor unit A (with service port) ø...
  • Page 39 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 40 MXZ-5C42NA Unit: inch (mm) 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) ø 1/2 Indoor unit A 4-way valve ø 3/8 Indoor unit B Stop valve Header(Evaporator)
  • Page 41 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 42 MXZ-2C20NAHZ Unit: inch (mm) 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 ø 3/8 4-way valve Indoor unit A Stop valve Header(Evaporator) (with service port) Outdoor...
  • Page 43 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 44 MXZ-3C24NAHZ MXZ-3C30NAHZ Unit: inch (mm) 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 ø 1/2 4-way valve Indoor unit A Stop valve Header(Evaporator) ø...
  • Page 45 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 46 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 47: Data

    DATA Model MXZ-2C20NA2 Indoor type Non-Duct (09+09) Duct (09+12) Item Unit Cooling Heating Cooling Heating Total Capacity Btu/h 18,000 22,000 20,000 22,000 – – – – – Input 1.417 1.641 2.000 1.771 Electrical Power supply (V, phase, Hz) 208/230, 1, 60 circuit Input 1.373...
  • Page 48 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 27,400 27,600 – – – – – Input 2.68 2.15 2.84 2.22 Electrical Power supply (V, phase, Hz) 208/230, 1, 60 circuit Input 2.614...
  • Page 49 Model MXZ-5C42NA MXZ-5C42NA2 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 4.12 3.47 Power supply (V, phase, Hz) 208/230, 1, 60 Input 4.300 3.465 3.870 3.270 Electrical circuit Comp.

  • Page 50: Cooling

    Model MXZ-3C24NAHZ MXZ-3C24NAHZ2 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 51 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-2C20NA2 MXZ-2C20NAHZ2 MXZ-3C24NA2 MXZ-3C24NAHZ2 MXZ-3C30NA2 MXZ-3C30NAHZ2 MXZ-4C36NA2 MXZ-5C42NA2 (2) OPERATION Intake air Indoor Outdoor temperature Function Condition DB (°F) WB (°F)
  • Page 52 MXZ-2C20NA2 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 53 8-2. CAPACITY AND THE INPUT CURVES MXZ-2C20NA2 Coolin capacit 11.7 11.4 10.7 10.5 Outdoor intake air Dr - ul temperature ( F) Total input (Coolin ) 11.7 11.4 10.7 10.5 Outdoor intake air Dr - ul temperature ( F) Heatin capacit 26.1 36.7 48.2...

  • Page 54: Heating

    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 12.1 12.0 10.9 10.7 Outdoor intake air Dry-bulb temperature (°F) Heating capacity 26.1 36.7...
  • Page 55 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 56 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 57 8-3. CAPACITY AND INPUT CORRECTION BY MEANS OF INVERTER OUTPUT FREQUENCY (OUTDOOR UNIT: MXZ-2C20NA2) 1. 06-class unit in single operation Total input Total input Capacity Capacity Frequency Frequency Frequency Frequency 2. 09-class unit in single operation Capacity Total input Total input Capacity Frequency Frequency...
  • Page 58 (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) 1. 06-class unit in single operation Total input Total input Capacity Capacity Frequency Frequency Frequency Frequency 2. 09-class unit in single operation Capacity Total input Total input Capacity Frequency Frequency Frequency Frequency 3.
  • Page 59 (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 Total input Total input Capacity Capacity Frequency Frequency Frequency Frequency 2. 09-class unit in single operation Capacity Total input Total input Capacity Frequency Frequency Frequency Frequency 3.
  • Page 60 8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT (1) COOL operation Data is based on the condition of indoor humidity 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
  • Page 61 (1) COOL operation Data is based on the condition of indoor humidity 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit. Inverter output frequency: 40 Hz 2.
  • Page 62 (1) COOL operation Data is based on the condition of indoor humidity 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit. Inverter output frequency: 40 Hz 2.
  • Page 63 (1) COOL operation Data is based on the condition of indoor humidity 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit. Inverter output frequency: 40 Hz 2.
  • Page 64 MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation Data is based on the condition of indoor humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit. Inverter output frequency: 24 Hz 2.
  • Page 65 MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation Data is based on the condition of indoor humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit. Inverter output frequency: 24 Hz 2.
  • Page 66 MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation Data is based on the condition of indoor humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit. Inverter output frequency: 24 Hz 2.
  • Page 67 MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation Data is based on the condition of indoor humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit. Inverter output frequency: 24 Hz 2.
  • Page 68 MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation Data is based on the condition of indoor humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit. Inverter output frequency: 24 Hz 2.
  • Page 69 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation Data is based on the condition of indoor humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit. Inverter output frequency: 24 Hz 2.
  • Page 70 (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 humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
  • Page 71 (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 humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
  • Page 72 (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 humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
  • Page 73 (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 humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
  • Page 74 (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 humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
  • Page 75 (OUTDOOR UNIT: MXZ-5C42NA MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-3C30NAHZ2) (1) COOL operation(1) COOL operation Data is based on the condition of indoor humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.

  • Page 76: Actuator Control

    ACTUATOR CONTROL MXZ-2C20NA2 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 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 MXZ-3C30NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C24NAHZ2...

  • Page 77: Service Functions

    SERVICE FUNCTIONS MXZ-2C20NA2 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 78 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 79: Troubleshooting

    TROUBLESHOOTING MXZ-2C20NA2 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) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring. 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 80 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 81 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (11-4.). LED indication The left lamp of Indoor/ (Outdoor P.C. OPERATION IN- Abnormal point outdoor unit Condition Remedy board) DICATOR lamp (Failure mode/protection) failure mode (Indoor unit) recall function LED 1 LED 2...
  • Page 82 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 83 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". Once LEV and drain pump unit does and drain pump. •...
  • Page 84 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. ( 11 times Not lit —...

  • Page 85: Trouble Criterion Of Main Parts

    11-5. TROUBLE CRITERION OF MAIN PARTS MXZ-2C20NA2 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 Outdoor heat exchanger temperature thermistor (RT68)
  • Page 86 11-6. TROUBLESHOOTING FLOW Outdoor unit does not operate. 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 87: Outdoor Unit Does Not Operate

    Indoor unit does not operate. Outdoor unit does not operate. Turn OFF the power supply. LED indication or communication status Communication status is indicated Is there rated voltage in by the LED. Check the power the power supply? supply. Unit status Blinking: normal communication Lighting: abnormal communication or not connected...
  • Page 88 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. board OPERATION in COOL mode. Is there voltage 208/230 V AC Replace the outdoor Is there voltage of 208/230 V AC between pin1 between the pin1 and pin3 at...
  • Page 89 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 P.C. board CN795 Is "click - click" sound heard? CN797 Normal Or, do you feel vibration of LEV coil with your hand? Disconnect the connectors.
  • Page 90 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. or more before measuring the voltage. Measure the voltage between each lead wire leading to the compressor.
  • Page 91 (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-2C20 5C42NA2 Normal MXZ-2C20 3C24 3C30NAHZ MXZ-2C20 3C24 3C30NAHZ2) Reconnect the connector in the following table and...
  • Page 92 CNF1 Outdoor control Disconnect CNF1 and measure the P.C. board resistance of the outdoor fan motor. (MXZ-3C24 3C30 4C36 5C42NA Is the resistance of outdoor fan motor Replace the outdoor fan motor. MXZ-2C20 3C24 3C30NAHZ) normal? (Refer to right table) Measuring points Resistance pin1 - pin4...
  • Page 93 Outdoor control 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. Check the resistance between each terminal. Reconnect CN63H.
  • Page 94 De rost thermistor (RT61) Dischar e temperature thermistor (RT62) 11-7. TEST POINT DIAGRAM AND VOLTAGE Am ient temperature thermistor (RT65) Outdoor heat e chan er temperature thermistor (RT68) MXZ-2C20NA2 100 110 120 (ºC) 104 122 140 158 176 194 212 230 248 (ºF) Temperature Thermistor R100...
  • Page 95 De rost thermistor (RT61) Dischar e temperature thermistor (RT62) Am ient temperature thermistor (RT65) MXZ-3C24NA MXZ-3C30NA Outdoor heat e chan er temperature thermistor (RT68) MXZ-4C36NA 100 110 120 (ºC) 104 122 140 158 176 194 212 230 248 (ºF) Temperature Thermistor R100 13.36 k 2% , B constant...
  • Page 96 De rost thermistor (RT61) Dischar e temperature thermistor (RT62) Am ient temperature thermistor (RT65) Outdoor heat e chan er temperature MXZ-5C42NA thermistor (RT68) MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ 100 110 120 (ºC) 104 122 140 158 176 194 212 230 248 (ºF) Temperature Thermistor R100 13.36 k...
  • Page 97 De rost thermistor (RT61) Dischar e temperature thermistor (RT62) Am ient temperature thermistor (RT65) Outdoor heat e chan er temperature MXZ-3C24NA2 MXZ-3C30NA2 thermistor (RT68) MXZ-4C36NA2 100 110 120 (ºC) 104 122 140 158 176 194 212 230 248 (ºF) Temperature Thermistor R100 13.36 k 2% , B constant...
  • Page 98 De rost thermistor (RT61) Dischar e temperature thermistor (RT62) Am ient temperature thermistor (RT65) Outdoor heat e chan er temperature MXZ-5C42NA2 thermistor (RT68) MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 100 110 120 (ºC) 104 122 140 158 176 194 212 230 248 (ºF) Temperature Thermistor R100 13.36 k...
  • Page 99 MXZ-2C20NA2 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 VAC Output F1 FUSE T6.3AL250V 208/230 VAC Input F2 FUSE T6.3AL250V CNAC1 208/230 VAC Output Connect to reactor Connect to reactor...
  • Page 100 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 208/230 V AC Input F2 FUSE T6.3AL250V...
  • Page 101 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 T6.3AL250V Transmission (From Outdoor Control P.C.

  • Page 102: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS The terminal which has the locking mechanism can be detached as shown below. There are following 2 types of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching.
  • Page 103 OPERATING PROCEDURE Photo 4 Electrical (1) Remove the service panel (Photo 1). box assembly (2) Disconnect the power supply cord and indoor/outdoor connecting wires. (3) Remove the top panel, the cabinet, and the back panel Catches of the outdoor control (Photo 1, 2, 3).
  • Page 104 OPERATING PROCEDURE Screws of the outdoor fan motor Photo 8 (1) Remove the service panel (Photo 1). (2) Disconnect the power supply cord and indoor/outdoor connecting wires. Sound (3) Remove the top panel, the cabinet, and the back panel proof (Photo 1, 2, 3).
  • Page 105 OPERATING PROCEDURE Photo 11 NOTE: Gas recovery is not required if the unit is pumped down. (1) Remove the top panel and the service panel (Refer to section 1). (2) Disconnect the power supply cord and indoor/outdoor connecting wires. (3) Remove all the LEV coils. (4) Detach all the brazed parts of the expansion valves and pipes.
  • Page 106 12-2. MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 Photos: MXZ-4C36NA MXZ-4C36NA2 OPERATING PROCEDURE Photo 1 the panels Screws of the top panel (1) Remove all the screws fixing the top panel, and remove the top panel. (2) Remove all the screws fixing the service panel. (3) Pull down on the service panel, and remove the service panel.
  • Page 107 OPERATING PROCEDURE Photo 8 (1) Remove the top panel and the service panel (Refer to section 1). (2) Disconnect the power supply cord and indoor/outdoor connecting wires. (3) Disconnect the wire-to-wire connector of the compressor Catches of the lead wire (Photo 6). outdoor contol P.C.
  • Page 108 OPERATING PROCEDURE (13) Disengage all the catches of the PB cover, and remove the PB cover (Photo 10). Photo 10 (14) Remove the screw fixing the outdoor power P.C. board and all the screws fixing the outdoor power P.C. board and the heatsink.
  • Page 109 OPERATING PROCEDURE Photo 15 (1) Remove the top panel, the service panel, and the front Propeller fan panel (Refer to section 1). (2) Disconnect the power supply cord and indoor/outdoor connecting wires. (3) Disconnect the connector of CNF1 on the outdoor control P.C.
  • Page 110 OPERATING PROCEDURE Photo 18 NOTE: Gas recovery is not required if the unit is pumped down. (1) Remove the top panel and the service panel (Refer to section 1). (2) Disconnect the power supply cord and indoor/outdoor connecting wires. Discharge pipe brazed part (3) Remove all the LEV coils.
  • Page 111 12-3. MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 Photos: MXZ-3C30NAHZ MXZ-3C30NAHZ2 OPERATING PROCEDURE the panels Photo 1 Screws of the top panel (1) Remove all the screws fixing the top panel, and remove the top panel. (2) Remove all the screws fixing the service panel. (3) Pull down on the service panel, and remove the service panel.
  • Page 112 OPERATING PROCEDURE Screw Photo 4 of the electrical (1) Remove the top panel, the service panel and the front parts panel (Refer to section 1). (2) Disconnect the power supply cord and indoor/outdoor Screws connecting wires. of the (3) Disconnect all the connectors on the outdoor control P.C. board. electrical (4) Remove all the screws fixing the outdoor control P.C.
  • Page 113 OPERATING PROCEDURE Photo 9 (1) Remove the top panel, the service panel, and the front Screw of the panel (Refer to section 1). Screws of the outdoor fan motor VB fixture (2) Disconnect the power supply cord and indoor/outdoor connecting wires. (3) Disconnect the connector of CNF1 on the outdoor control P.C.
  • Page 114 OPERATING PROCEDURE Photo 11 NOTE: Gas recovery is not required if the unit is pumped down. Discharge pipe Suction pipe (1) Remove the top panel and the service panel (Refer to brazed part brazed part section 1). (2) Disconnect the power supply cord and indoor/outdoor connecting wires.

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