Trane NTXWPH A Series Service Manual
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Trane NTXWPH A Series Service Manual

Indoor/outdoor unit
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Table of Contents

OUTDOOR UNIT
SERVICE MANUAL
Models
NTXMMX20A122AA
NTXMMX24A132AA
NTXMMX30A132AA
NTXMMX36A142AA
NTXMMX42A152AA
NTXMPH20A122AA
NTXMPH24A132AA
NTXMPH30A132AA
NTXMMX24A132AA
NTXMMX30A132AA
NTXMMX36A142AA
HFC
utilized
R410A
Indoor unit service manual
NTXWPH·A Series (OBHT683)
NTX(Y)WST·A Series (OBHT732)
NTXFKS·A Series (OBHT752)
NTXCKS·A Series (OCHT669)
PLA-A·EA Series (OCH640)
NTXDKS·A Series
PEAD-A·AA Series
PCA-A·KA Series (OCH455)
NTXAMT·A Series
CONTENTS
1. TECHNICAL CHANGES ··································· 4
2. PART NAMES AND FUNCTIONS ····················· 5
3. SPECIFICATION ················································ 6
4. NOISE CRITERIA CURVES ···························· 14
5. OUTLINES AND DIMENSIONS ······················ 16
6. WIRING DIAGRAM ·········································· 22
7. REFRIGERANT SYSTEM DIAGRAM ············· 28
8. DATA ································································ 41
9. ACTUATOR CONTROL ··································· 70
10. SERVICE FUNCTIONS ···································· 71
11. TROUBLESHOOTING ····································· 73
12. DISASSEMBLY INSTRUCTIONS ···················· 94
PARTS CATALOG (OBBT702)
No. OBHT702

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Summary of Contents for Trane NTXWPH A Series

  • Page 1: Table Of Contents

    OUTDOOR UNIT No. OBHT702 utilized SERVICE MANUAL R410A Models NTXMMX20A122AA NTXMMX24A132AA Indoor unit service manual NTXMMX30A132AA NTXWPH·A Series (OBHT683) NTXMMX36A142AA NTX(Y)WST·A Series (OBHT732) NTXMMX42A152AA NTXFKS·A Series (OBHT752) NTXCKS·A Series (OCHT669) NTXMPH20A122AA PLA-A·EA Series (OCH640) NTXMPH24A132AA NTXDKS·A Series PEAD-A·AA Series NTXMPH30A132AA PCA-A·KA Series (OCH455) NTXAMT·A Series CONTENTS...
  • Page 2 Use the specified refrigerant only Never use any refrigerant other than that specified. 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 <NTXMMX24A132AA> <NTXMMX42A152AA> 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 06 09 12 15 18 24 30 36 06 09 12 15 18 24 30 36 NTXWPH**A112AA NTXWPH**A112AA...

  • Page 4: Technical Changes

    TECHNICAL CHANGES NTXMMX20A122AA NTXMMX24A132AA NTXMMX30A132AA NTXMMX36A142AA NTXMMX42A152AA NTXMPH20A122AA NTXMPH24A132AA NTXMPH30A132AA 1. New model OBHT702...

  • Page 5: Part Names And Functions

    PART NAMES AND FUNCTIONS NTXMMX24A132AA NTXMMX20A122AA NTXMMX30A132AA NTXMMX36A142AA Air inlet Air inlet (Back and side) (Back and side) Air outlet Air outlet Drain outlet Drain outlet NTXMMX42A152AA NTXMPH20A122AA NTXMPH24A132AA NTXMPH30A132AA Air inlet (Back and side) Air outlet Drain outlet OBHT702...

  • Page 6: Specification

    SPECIFICATION NTXMMX20A122AA Outdoor model Item Indoor type Non-Duct (09+09) Duct (09+12) 18,000 20,000 Cooling Btu/h 22,000 22,000 Capacity Heating 47 Btu/h Heating 17 Btu/h 1,2500 13,500 1,417 2,000 Cooling Power Heating 47 1,641 1,771 consumption 1,300 1,350 Heating 17 Cooling 12.7 10.0 20.0...
  • Page 7 NTXMMX24A132AA Outdoor model Item Indoor type Non-Duct (06+09+09) Duct (09+09+09) 22,000 23,600 Cooling Btu/h 25,000 24,600 Capacity Heating 47 Btu/h Heating 17 Btu/h 19,600 19,600 1,620 2,100 Cooling Power Heating 47 1,750 1,900 consumption 2,580 2,440 Heating 17 Cooling 13.6 11.2 20.0 16.0...
  • Page 8 NTXMMX30A132AA Outdoor model Item Indoor type Non-Duct (09+09+12) Duct (09+09+12) 28,400 27,400 Cooling Btu/h 28,600 27,600 Capacity Heating 47 Btu/h Heating 17 Btu/h 21,000 21,000 2,680 2,840 Cooling Power Heating 47 2,150 2,220 consumption 2,740 2,820 Heating 17 Cooling 10.6 19.0 16.2 SEER...
  • Page 9 NTXMMX36A142AA Outdoor model Item Indoor type Non-Duct (09+09+09+09) Duct (09+09+09+09) 35,400 34,400 Cooling Btu/h 36,000 34,400 Capacity Heating 47 Btu/h Heating 17 Btu/h 26,600 26,600 3,760 3,940 Cooling Power Heating 47 3,020 3,100 consumption 3,440 3,540 Heating 17 Cooling 19.2 16.0 SEER Cooling...
  • Page 10 NTXMMX42A152AA Outdoor model Item Indoor type Non-Duct (06+09+09+09+09) Duct (09+09+09+09+09) 40,500 37,500 Cooling Btu/h 45,000 41,000 Capacity Heating 47 Btu/h Heating 17 Btu/h 30,500 29,100 4,403 4,112 Cooling Power Heating 47 3,575 3,463 consumption 4,800 5,500 Heating 17 Cooling 19.7 15.2 SEER Cooling...
  • Page 11 NTXMPH20A122AA Outdoor model Item Indoor type Non-Duct (09+09) Duct (09+12) 18,000 20,000 Cooling Btu/h 22,000 22,000 Capacity Heating 47 Btu/h Heating 17 Btu/h 22,000 22,000 1,334 1,819 Cooling Power Heating 47 1,612 1,748 consumption 3,071 3,224 Heating 17 Cooling 13.5 11.0 17.0 15.0...
  • Page 12 NTXMPH24A132AA Outdoor model Item Indoor type Non-Duct (06+06+09) Duct (09+09+09) 22,000 23,600 Cooling Btu/h 25,000 24,600 Capacity Heating 47 Btu/h Heating 17 Btu/h 25,000 24,600 1,630 2,360 Cooling Power Heating 47 1,725 1,871 consumption 3,557 3,795 Heating 17 Cooling 13.5 10.0 19.0 15.5...
  • Page 13 NTXMPH30A132AA Outdoor model Item Indoor type Non-Duct (09+09+12) Duct (09+09+12) 28,400 27,400 Cooling Btu/h 28,600 27,600 Capacity Heating 47 Btu/h Heating 17 Btu/h 28,600 27,600 2,272 2,661 Cooling Power Heating 47 2,096 2,187 consumption 4,192 4,258 Heating 17 Cooling 12.5 10.3 18.0 16.0...

  • Page 14: Noise Criteria Curves

    NOISE CRITERIA CURVES NTXMMX24A132AA NTXMMX20A122AA 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 15 NTXMMX42A152AA NTXMPH20A122AA 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 NC-20 CONTINUOUS CONTINUOUS...

  • Page 16: Outlines And Dimensions

    OUTLINES AND DIMENSIONS NTXMMX20A122AA 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 17 NTXMMX24A132AA Unit: inch (mm) NTXMMX30A132AA Conduit plates Conduit connector Lock nut OBHT702...
  • Page 18 NTXMMX36A142AA Unit: inch (mm) Conduit plates Conduit connector Lock nut OBHT702...
  • Page 19 NTXMMX42A152AA Unit: inch (mm) Conduit plate Top Conduit connector Lock nut Conduit plate Under OBHT702...
  • Page 20 NTXMPH20A122AA Unit: inch (mm) Lock nut Conduit plate Conduit connector OBHT702...
  • Page 21 NTXMPH24A132AA Unit: inch (mm) NTXMPH30A132AA Lock nut Conduit plate Top Conduit connector Conduit plate Under OBHT702...

  • Page 22: Wiring Diagram

    WIRING DIAGRAM NTXMMX20A122AA OBHT702...
  • Page 23 NTXMMX24A132AA NTXMMX30A132AA OBHT702...
  • Page 24 NTXMMX36A142AA OBHT702...
  • Page 25 NTXMMX42A152AA OBHT702...
  • Page 26 NTXMPH20A122AA OBHT702...
  • Page 27 NTXMPH24A132AA NTXMPH30A132AA OBHT702...

  • Page 28: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM NTXMMX20A122AA 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 (ø9.52) Stop valve with 4-way service port valve Indoor unit...
  • Page 29 Operating Range NTXMMX20A122AA 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 NTXMMX20A122AA Piping length each indoor unit (a, b) 82 ft.
  • Page 30 NTXMMX24A132AA Unit: inch (mm) NTXMMX30A132AA 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 (ø12.7) Stop valve Indoor unit A 4-way valve (with service port) ø...
  • Page 31 Operating Range NTXMMX24A132AA NTXMMX30A132AA 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 NTXMMX24A132AA NTXMMX30A132AA Piping length each indoor unit (a, b, c) 82 ft.
  • Page 32 NTXMMX36A142AA 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 (ø12.7) 4-way valve Indoor unit A (with service port) ø...
  • Page 33 Operating Range NTXMMX36A142AA 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 NTXMMX36A142AA Piping length each indoor unit (a, b, c, d) 82 ft.
  • Page 34 NTXMMX42A152AA 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) 4-way valve ø 1/2 (ø12.7) Indoor unit A muffler ø...
  • Page 35 Operating Range NTXMMX42A152AA 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 NTXMMX42A152AA Piping length each indoor unit (a, b, c, d, e) 82 ft.
  • Page 36 NTXMPH20A122AA 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 4-way valve ø 3/8 (ø9.52) Indoor unit A muffler Stop valve Header(Evaporator) (with service port)
  • Page 37 Operating Range NTXMPH20A122AA 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 NTXMPH20A122AA Piping length each indoor unit (a, b) 82 ft.
  • Page 38 NTXMPH24A132AA NTXMPH30A132AA 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 4-way valve ø 1/2 (ø12.7) Indoor unit A muffler Stop valve Header(Evaporator)
  • Page 39 Operating Range NTXMPH24A132AA NTXMPH30A132AA 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 NTXMPH24A132AA NTXMPH30A132AA Piping length each indoor unit (a, b, c) 82 ft.
  • Page 40 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 41: Data

    DATA NTXMMX20A122AA Model 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 42 NTXMMX30A132AA Model 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 43 NTXMMX42A152AA 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 4.12 3.47 Power supply (V, phase, Hz) 208/230, 1, 60 Input 4.300 3.465 3.870 3.270 Electrical circuit Comp.
  • Page 44 NTXMPH24A132AA 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 45 8-1. OPERATING RANGE (1) POWER SUPPLY Model Rating Guaranteed Voltage NTXMMX20A122AA NTXMMX24A132AA NTXMMX30A132AA NTXMMX36A142AA Outdoor unit 208/230 V 60 Hz 1ø NTXMMX42A152AA NTXMPH20A122AA NTXMPH24A132AA NTXMPH30A132AA (2) OPERATION Intake air Outdoor Indoor temperature Function Condition DB (°F) WB (°F) DB (°F) WB (°F) "A"...
  • Page 46 NTXMMX20A122AA NTXMMX24A132AA NTXMMX30A132AA NTXMMX36A142AA NTXMMX42A152AA NTXMPH20A122AA NTXMPH24A132AA NTXMPH30A132AA 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 47 8-2. CAPACITY AND THE INPUT CURVES NTXMMX20A122AA Cooling capacity 11.7 11.4 10.7 10.5 Outdoor intake air Dry-bulb temperature (°F) Total input (Cooling) 11.7 11.4 10.7 10.5 Outdoor intake air Dry-bulb temperature (°F) Heating capacity 36.7 48.2 52.8 26.1 24.3 34.0 44.8 49.1 22.5...
  • Page 48 NTXMMX24A132AA NTXMMX30A132AA NTXMMX36A142AA 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 49 NTXMMX42A152AA 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 NTXMPH20A122AA NTXMPH24A132AA NTXMPH30A132AA 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: NTXMMX20A122AA) 1. 06-class unit in single operation <HEAT>Total input <COOL>Total input <HEAT>Capacity <COOL>Capacity Frequency Frequency Frequency Frequency 2. 09-class unit in single operation <HEAT>Capacity <HEAT>Total input <COOL>Capacity <COOL>Total input Frequency Frequency...
  • Page 52 (OUTDOOR UNIT: NTXMMX24A132AA NTXMMX30A132AA NTXMMX36A142AA) 1. 06-class unit in single operation <HEAT>Capacity <HEAT>Total input <COOL>Capacity <COOL>Total input 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. 12-class unit in single operation <HEAT>Total input <COOL>Total input <HEAT>Capacity...
  • Page 53 (OUTDOOR UNIT: NTXMMX42A152AA NTXMPH20A122AA NTXMPH24A132AA NTXMPH30A132AA) 1. 06-class unit in single operation <HEAT>Capacity <HEAT>Total input <COOL>Capacity <COOL>Total input 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. 12-class unit in single operation <HEAT>Total input <COOL>Total input <HEAT>Capacity...
  • Page 54 8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT 1. 06-class unit in single operation (OUTDOOR UNIT: NTXMMX20A122AA) (1) COOL operation Data is based on the condition of indoor humidity <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
  • Page 55 2. 09-class unit in single operation (OUTDOOR UNIT: NTXMMX20A122AA) (1) COOL operation Data is based on the condition of indoor humidity <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
  • Page 56 3. 12-class unit in single operation (OUTDOOR UNIT: NTXMMX20A122AA) (1) COOL operation Data is based on the condition of indoor humidity <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
  • Page 57 4. 15-class unit in single operation (OUTDOOR UNIT: NTXMMX20A122AA) (1) COOL operation Data is based on the condition of indoor humidity <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
  • Page 58 5. 06-class unit in single operation (OUTDOOR UNIT: NTXMMX24A132AA NTXMMX30A132AA NTXMMX36A142AA) (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 6. 09-class unit in single operation (OUTDOOR UNIT: NTXMMX24A132AA NTXMMX30A132AA NTXMMX36A142AA) (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 7. 12-class unit in single operation (OUTDOOR UNIT: NTXMMX24A132AA NTXMMX30A132AA NTXMMX36A142AA) (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 8. 15-class unit in single operation (OUTDOOR UNIT: NTXMMX24A132AA NTXMMX30A132AA NTXMMX36A142AA) (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 9. 18-class unit in single operation (OUTDOOR UNIT: NTXMMX24A132AA NTXMMX30A132AA NTXMMX36A142AA) (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 10. 24-class unit in single operation (OUTDOOR UNIT: NTXMMX30A132AA NTXMMX36A142AA) (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 11. 06-class unit in single operation (OUTDOOR UNIT: NTXMMX42A152AA NTXMPH20A122AA NTXMPH24A132AA NTXMPH30A132AA) (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 12. 09-class unit in single operation (OUTDOOR UNIT: NTXMMX42A152AA NTXMPH20A122AA NTXMPH24A132AA NTXMPH30A132AA) (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 66 13. 12-class unit in single operation (OUTDOOR UNIT: NTXMMX42A152AA NTXMPH20A122AA NTXMPH24A132AA NTXMPH30A132AA) (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 67 14. 15-class unit in single operation (OUTDOOR UNIT: NTXMMX42A152AA NTXMPH20A122AA NTXMPH24A132AA NTXMPH30A132AA) (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 68 15. 18-class unit in single operation (OUTDOOR UNIT: NTXMMX42A152AA NTXMPH24A132AA NTXMPH30A132AA) (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 69 16. 24-class unit in single operation (OUTDOOR UNIT: NTXMMX42A152AA NTXMPH30A132AA) (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 70: Actuator Control

    ACTUATOR CONTROL NTXMMX20A122AA NTXMMX24A132AA NTXMMX30A132AA NTXMMX36A142AA NTXMMX42A152AA NTXMPH20A122AA NTXMPH24A132AA NTXMPH30A132AA Relation between main sensor and actuator Actuator 2-way solenoid Defrost valve heater Sensor Purpose Outdoor (NTXMMX42A152AA Compressor 4-way valve (NTXMPH20A122AA fan motor NTXMPH20A122AA NTXMPH24A132AA NTXMPH24A132AA NTXMPH30A132AA) NTXMPH30A132AA) ○ ○ ○ Discharge temperature Protection thermistor...

  • Page 71: Service Functions

    SERVICE FUNCTIONS NTXMMX20A122AA NTXMMX24A132AA NTXMMX30A132AA NTXMMX36A142AA NTXMMX42A152AA NTXMPH20A122AA NTXMPH24A132AA NTXMPH30A132AA 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. To improve start-up condition, the compressor is energized even while it is not operating. This is to generate heat at the winding.
  • Page 72 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 73: Troubleshooting

    TROUBLESHOOTING NTXMMX20A122AA NTXMMX24A132AA NTXMMX30A132AA NTXMMX36A142AA NTXMMX42A152AA NTXMPH20A122AA NTXMPH24A132AA NTXMPH30A132AA 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. 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 74 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. With the remote controller headed towards the indoor unit, press the TEM- PERATURE buttons to adjust the set temperature to 77°F (25°C).
  • Page 75 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 The left lamp of LED indication Indoor/outdoor OPERATION IN- Abnormal point (Outdoor P.C. unit failure Condition Remedy DICATOR lamp (Failure mode/protection)
  • Page 76 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 77 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 78 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. 3 minutes 11 times Not lit (NTXMMX24/30A132AA, NTXMMX36A142AA, —...
  • Page 79 11-5. TROUBLE CRITERION OF MAIN PARTS NTXMMX20A122AA NTXMMX24A132AA NTXMMX30A132AA NTXMMX36A142AA NTXMMX42A152AA NTXMPH20A122AA NTXMPH24A132AA NTXMPH30A132AA 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. “Test point diagram and voltage”, 1. ”Outdoor control P.C.board”, thermistor (RT65) 2.
  • Page 80 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 81 • 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 82 The cooling operation or heating operation does not operate. Check of R.V. coil • When cooling operation does not work. 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 83 • 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 84 • 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 85 • When thermistor is abnormal. Check of outdoor thermistors (NTXMMX24A/30A132AA, NTXMMX36A142AA) 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.) (NTXMMX20A122AA, NTXMMX42A152AA Normal NTXMPH20A122AA, NTXMPH24A132AA...
  • Page 86 • Fan motor does not operate or stops operating shortly after starting the operation. Check of outdoor fan motor CNF1 Outdoor control Disconnect CNF1 and measure the P.C. board resistance of the outdoor fan motor. Is the resistance of outdoor fan motor Measuring points Resistance Replace the outdoor fan motor.
  • Page 87 • When the operation frequency does not go up from the lowest frequency. Check of HPS 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.
  • Page 88 11-7. TEST POINT DIAGRAM AND VOLTAGE Discharge temperature thermistor (RT62) Defrost thermistor (RT61) Ambient temperature thermistor (RT65) 1. Outdoor control P.C. board Outdoor heat exchanger temperature NTXMMX20A122AA thermistor (RT68) 100 110 120 (ºC) (ºF) 104 122 140 158 176 194 212 230 248 Temperature Thermistor R100 = 13.36 kΩ...
  • Page 89 1. Outdoor control P.C. board Discharge temperature thermistor (RT62) Defrost thermistor (RT61) Ambient temperature thermistor (RT65) NTXMMX24A132AA Outdoor heat exchanger temperature thermistor (RT68) NTXMMX30A132AA NTXMMX36A142AA 100 110 120 (ºC) (ºF) 104 122 140 158 176 194 212 230 248 Temperature Thermistor R100 = 13.36 kΩ...
  • Page 90 1. Outdoor control P.C. board Discharge temperature thermistor (RT62) Defrost thermistor (RT61) Ambient temperature thermistor (RT65) NTXMMX42A152AA Outdoor heat exchanger temperature thermistor (RT68) NTXMPH20A122AA NTXMPH24A132AA NTXMPH30A132AA 100 110 120 (ºC) (ºF) 104 122 140 158 176 194 212 230 248 Temperature Thermistor R100 = 13.36 kΩ...
  • Page 91 2. Outdoor power P.C. board NTXMMX20A122AA 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...
  • Page 92 2. Outdoor power P.C. board NTXMMX24A132AA NTXMMX30A132AA NTXMMX36A142AA 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...
  • Page 93 2. Outdoor power P.C. board NTXMMX42A152AA NTXMPH20A122AA NTXMPH24A132AA NTXMPH30A132AA 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...

  • Page 94: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS <Detaching method of the terminal with locking mechanism> 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 95 OPERATING PROCEDURE PHOTOS/FIGURES Photo 4 2. Removing the outdoor control P.C. board, the out- door power P.C. board and the reactor 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...
  • Page 96 OPERATING PROCEDURE PHOTOS/FIGURES Screws of the outdoor fan motor . Removing the 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 97 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the expansion valve 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.
  • Page 98 12-2. NTXMMX24A132AA NTXMMX30A132AA NTXMMX36A142AA Photos: NTXMMX36A142AA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES Photo 1 1. Removing 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.
  • Page 99 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the outdoor control P.C. board, the reac- tor, the outdoor power P.C. board, and the heatsink Photo 6 (1) Remove the top panel and the service panel (Refer to section 1). (2) Disconnect the power supply cord and indoor/outdoor connecting wires.
  • Page 100 OPERATING PROCEDURE PHOTOS/FIGURES (13) Disengage all the catches of the PB cover, and remove the PB cover (Photo 9). Photo 9 (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 (Photo 10).
  • Page 101 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the fan motor Photo 14 (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 102 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the expansion valve Photo 17 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 Discharge pipe connecting wires.
  • Page 103 12-3. NTXMMX42A152AA NTXMPH20A122AA NTXMPH24A132AA NTXMPH30A132AA Photos: NTXMPH30A132AA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the panels Photo 1 (1) Remove all the screws fixing the top panel, and remove Screws of the top panel the top panel.
  • Page 104 OPERATING PROCEDURE PHOTOS/FIGURES 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 section 1). (2) Disconnect the power supply cord and indoor/outdoor Screws connecting wires.
  • Page 105 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the fan motor 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.
  • Page 106 Expansion Compressor nuts LEV coils valves MITSUBISHI ELECTRIC TRANE HVAC US LLC HEAD OFFICE: 1340 SATELLITE BOULEVARD, SUWANEE, GA 30024, USA © Copyright 2018 MITSUBISHI ELECTRIC CORPORATION Published: Nov. 2018. No. OBHT702 Specifications are subject to change without notice.

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