Mitsubishi Electric TRANE NTXAMT12A112AA Service Manual
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Mitsubishi Electric TRANE NTXAMT12A112AA Service Manual

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NTXAMT12, 18, 24, 30, 36A112AA
SERVICE MANUAL

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Summary of Contents for Mitsubishi Electric TRANE NTXAMT12A112AA

  • Page 1 Air Conditioners NTXAMT12, 18, 24, 30, 36A112AA SERVICE MANUAL...

  • Page 2: Table Of Contents

    12.9. Functions of DIP switch and jumper wire ..............56 13. DISASSEMBLY PROCEDURE ....................57 13.1. Control box ....................... 57 13.2. Thermistor (Return Air) ....................58 13.3. Coil Assembly ......................59 Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 3 NTXAMT12, 18, 24, 30, 36A112AA 13.4. Blower/Fan Assembly ....................62 Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 4: Safety Precaution

    Use a vacuum pump with a reverse flow check valve. Vacuum pump oil may flow back into refrigerant cycle and that can cause deterioration of refrigerant oil etc. Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 5 • Check that cylinder for R410A on the market is syphon type. • Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.) Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 6 Refrigerant charge base ⑦ Refrigerant cylinder • Only for R410A • Top of cylinder (Pink) • Cylinder with syphon ⑧ Refrigerant recovery equipment Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 7: Part Names And Functions

    2. PART NAMES AND FUNCTIONS • Indoor Unit (1) Vertical (2) Horizontal Right (3) Horizontal Left NOTE For downflow installations, please see downflow kit manuals. Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 8: Specification

    (in.) 19.05 (3/4) FPT Dimensions mm (in.) 432 (17) mm (in.) 548 (21-5/8) mm (in.) 1011 (39-13/16) kg (lbs) Weight 42 (93) Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 9 (in.) 19.05 (3/4) FPT Dimensions mm (in.) 534 (21) mm (in.) 548 (21-5/8) mm (in.) 1113.8 (43-7/8) Weight kg (lbs) 54 (119) Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 10: Fan Performance And Corrected Airflow

    External static pressure: 125Pa, 0.30 [in.WG] External static pressure: 125Pa, 0.30 [in.WG] Power source: 208, 230 60Hz Power source: 208, 230 60Hz Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 11 *. 200 Pa (0.80 in WG) does not have "Rated point". *. 200 Pa (0.80 in WG) does not have "Rated point". NOTE For downflow installations, please see downflow kit manuals. Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 12: Ntxamt18A112Aa

    External static pressure: 125Pa, 0.30 [in.WG] External static pressure: 125Pa, 0.30 [in.WG] Power source: 208, 230 60Hz Power source: 208, 230 60Hz Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 13 *. 200 Pa (0.80 in WG) does not have "Rated point". *. 200 Pa (0.80 in WG) does not have "Rated point". NOTE For downflow installations, please see downflow kit manuals. Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 14: Ntxamt24A112Aa

    External static pressure: 125Pa, 0.30 [in.WG] External static pressure: 125Pa, 0.30 [in.WG] Power source: 208, 230 60Hz Power source: 208, 230 60Hz Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 15 External static pressure: 200Pa, 0.80 [in.WG] Power source: 208, 230 60Hz Power source: 208, 230 60Hz NOTE For downflow installations, please see downflow kit manuals. Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 16: Ntxamt30A112Aa

    External static pressure: 125Pa, 0.30 [in.WG] External static pressure: 125Pa, 0.30 [in.WG] Power source: 208, 230 60Hz Power source: 208, 230 60Hz Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 17 External static pressure: 200Pa, 0.80 [in.WG] Power source: 208, 230 60Hz Power source: 208, 230 60Hz NOTE For downflow installations, please see downflow kit manuals. Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 18: Ntxamt36A112Aa

    External static pressure: 125Pa, 0.30 [in.WG] External static pressure: 125Pa, 0.30 [in.WG] Power source: 208, 230 60Hz Power source: 208, 230 60Hz Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 19 External static pressure: 200Pa, 0.80 [in.WG] Power source: 208, 230 60Hz Power source: 208, 230 60Hz NOTE For downflow installations, please see downflow kit manuals. Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 20: Sound Pressure Levels

    NTXAMT12, 18, 24, 30, 36A112AA 5. SOUND PRESSURE LEVELS 5.1. Sound pressure level Multi-Position Aux.duct Front side 3-1/4ft. (1m) Measurement location Aux.duct Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 21: Nc Curves

    NTXAMT12, 18, 24, 30, 36A112AA 5.2. NC Curves 5.2.1. NTXAMT12A112AA Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 22: Ntxamt18A112Aa

    NTXAMT12, 18, 24, 30, 36A112AA 5.2.2. NTXAMT18A112AA Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 23: Ntxamt24A112Aa

    NTXAMT12, 18, 24, 30, 36A112AA 5.2.3. NTXAMT24A112AA Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 24: Ntxamt30A112Aa

    NTXAMT12, 18, 24, 30, 36A112AA 5.2.4. NTXAMT30A112AA Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 25: Ntxamt36A112Aa

    NTXAMT12, 18, 24, 30, 36A112AA 5.2.5. NTXAMT36A112AA Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 26: Air Filter

    Power source: 208/230V 60Hz [0.100] [0.080] A30,36 KP30,36 [0.060] A12,18,24 KP12,18,24 [0.040] [0.020] [353] [706] [1059] [1412] [1766] Airflow rate (m /min)[cfm] Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 27: Outlines & Dimensions

    NTXAMT12, 18, 24, 30, 36A112AA 6. OUTLINES & DIMENSIONS Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 28: Wiring Diagram

    At receiving MA transmission power source Lighting LED3 At transmitting indoor-outdoor units Flashing Note) The SWE should not be left turned on for longer than 10 hours. Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 29: Refrigerant System Diagram

    Refrigerant flow in heating Thermistor TH2 Pipe temperature(Liquid) Refrigerant LIQUID pipe connection (Flare) Thermistor TH1 (Room temperature) Strainer (#50) Distributor with strainer (#50) Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 30: Heater Control

    • T RA : Return Air temperature • X: Time delay (Selectable. Default is 24 min. Selectable to 24 or 29 min) Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 31 ) < 2.7 °F [1.5 °C] increasing faster than 0.9 °F EH2 not ON [0.5°C] in 7 min ③ ) < 0.9 °F [0.5°C] EH1 OFF Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 32 EH2 ON 0.9 °F [0.5°C] in 7 min ⑥ ) < 0.9 °F [0.5°C] EH1 OFF EH2 OFF Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 33: Fan Control

    STOP Remote Controller – Setting Fan Control Remote Remote Controller – Controller Setting Setting Refer to the Installation Manual for function settings. Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 34: Cn24Relay-Kit-Cm3 (Optional Parts) Installation

    Control cable type: CVV, CVS, CPEV or equivalent.Cable size: 0.5 mm ~ 1.25 mm (16 to 22 AWG) Don't extend the cable more than 10 meters (32ft) Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 35 • Longer than 10 meters (32 ft) could cause improper operation. • Use a transit relay when extending wiring such as remote wiring. Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 36: Humidifier Control Specifications

    No humidifier operation RC setting Factory Settings RC: Remote controller The fan continues to run for 30 seconds after the humidifier stops. Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 37: Installation

    Except for heat operation RC setting RC: Remote controller The fan continues to run for 30 seconds after the humidifier stops. *Factory Setting Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 38: Erv (Energy Recovery Ventilation) Control

    3. If the unit goes into defrost, CN2C stops 12VDC output ERV Switch: • Non-Voltage a-contact input • Contact rating voltage >= 15VDC • Contact rating current >= 0.1 A Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 39: Installation

    (=Fan output) CNER input Cool/Heat/Fan operation RC setting Defrost STOP STOP STOP Cool/Heat/Fan operation RC setting Defrost STOP STOP STOP RC: Remote controller Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 40: Troubleshooting

    3. When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires. Lead wires Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 41: Self-Check Function, Function Table

    U1, Ud Abnormal high pressure (63H worked)/ Overheating safe- guard operation Abnormal temperature of heat sink Outdoor unit fan protection stop Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 42 On the IR wireless remote controller with conditions above, following phenomena takes place. • No signals from the remote controller are accepted. • OPE lamp is blinking. Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 43 The auto restart function sets to work the moment the power has restored after power failure, then, the unit will restart automatically. Set the AUTO RESTART FUNCTION using the wireless remote controller. (Mode no.1). Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 44 When CN4Y is used, the fan is off when CN24 is energized, which is only for use with supplemental heat that is not in the duct. Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 45: Self-Diagnosis Action Table

    (3 and 4 of connector CN4F is not short-circuited.) board Operate with connector (CN4F) short- Constantly detected during operation. circuited. Refer to 12-5. Replace indoor controller board if abnormality reappears. Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 46 • Indoor controller board is de- fective. Defective outdoor fan control Overcharge of refrigerant 7 Defective refrigerant circuit (clogs) Bypass circuit of outdoor unit is defective Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 47 5. When no problems are found in 1–4 above, Defective indoor controller replace the indoor unit control board. board Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 48 ∗ Other indoor controller board may have de- fect in case of twin triple indoor unit system. Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 49 30 seconds. Motor failure b) When the number of rotations is detected to be above the upper limit for 30 seconds. Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 50: Troubleshooting By Inferior Phenomena

    Short-cut of remote controller wires 4 Defective remote controller. Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 51: Test Point Diagram

    1 - 6.5VDC (with the fan in operation) (Same with the voltage between 6 (+) and 4 (-) of CNMF) CNXB1 CNXC1 CNXA1 (*1) PC51 (*1) (*1) Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 52: Indoor Controller Board

    Connect to the indoor power board CNXC1 Connect to the indoor power board CNER ERV controll CN2C ERV input CN25 Humidity conrol Humidity input Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 53: Trouble Criterion Of Main Parts

    Vcc (Power supply for control) Regulator Hall IC Vsp (Speed command voltage) Power PG (Pulse output for rotation) device driver Current detecting resistor Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 54: Thermistor

    10 20 30 40 50 (˚C) 30°C (86°F) 4.3 k" ˚F -4 14 32 50 68 86 104 122 40°C (104°F) 3.0 k" Temperature Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 55: Dc Fan Motor (Fan Motor/Indoor Controller Board)

    150kΩ pin 7 - pin 4 O.L. *To measure the resistance, connect the negative (-) end of the tester to pin 4. Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 56: Functions Of Dip Switch And Jumper Wire

    (TH5). setting ⃝ Without TH5 With TH5 Indoor Indoor controller board type controller ⃝ Factory shipment board type ⃝ Service parts setting Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 57: Disassembly Procedure

    NTXAMT12, 18, 24, 30, 36A112AA 13. DISASSEMBLY PROCEDURE 13.1. Control box CAUTION Exercise caution when removing heavy parts. 1. Remove blower panel. Fig. 1 Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 58: Thermistor (Return Air)

    CN20. Return Air Thermistor Wire Fig. 3 Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

  • Page 59: Coil Assembly

    (3) smaller panels for refrigerant and drain lines. Fig. 4 3. Slide the smaller panels in the directions indicated and remove. Fig. 5 Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 60 Fig. 6 Fig. 7 5. Remove the plate covering the coil assembly to access the thermistors. Fig. 8 Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 61 NTXAMT12, 18, 24, 30, 36A112AA 6. Remove lower and side drain pan. Fig. 9 Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 62 5. Remove coil panel and smaller drain panel. 6. Remove the (2) screws that secure the fan assembly and slide out. Fig. 12 Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.
  • Page 63 Please be sure to put the contact address/telephone number on this manual before handing it to the customer. MITSUBISHI ELECTRIC TRANE HVAC US LLC Toll Free: 800-433-4822 MEUS DOC# MD-1404-K042 Ver.2, March 2022 Specifications are subject to change without notice. © 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.

This manual is also suitable for:

Trane ntxamt18a112aaTrane ntxamt24a112aaTrane ntxamt30a112aaTrane ntxamt36a112aa

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