Mitsubishi Electric NTXSMT09A111AA Service Manual
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Mitsubishi Electric NTXSMT09A111AA Service Manual

Mitsubishi Electric NTXSMT09A111AA Service Manual

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OUTDOOR UNIT
SERVICE MANUAL
Models
NTXSMT09A111AA
NTXSMT12A111AA
NTXSMT09A111AA
Revision A:
• Some descriptions have been modified.
OBHT821 is void.
HFC
utilized
R410A
Indoor unit service manual
NTXWMT•A111AA Series (OBHT820)
CONTENTS
1. TECHNICAL CHANGES ···································· 3
2. PART NAMES AND FUNCTIONS ····················· 4
3. SPECIFICATION ················································ 5
4. OUTLINES AND DIMENSIONS ························· 8
5. WIRING DIAGRAM ············································ 9
6. REFRIGERANT SYSTEM DIAGRAM ············· 10
7. DATA ·································································11
8. ACTUATOR CONTROL ··································· 18
9. SERVICE FUNCTIONS ···································· 19
10. TROUBLESHOOTING ····································· 20
11. DISASSEMBLY INSTRUCTIONS ···················· 39
PARTS CATALOG (OBBT821)
No. OBHT821
REVISED EDITION-A

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Summary of Contents for Mitsubishi Electric NTXSMT09A111AA

  • Page 1: Table Of Contents

    OBHT821 is void. OUTDOOR UNIT No. OBHT821 utilized REVISED EDITION-A SERVICE MANUAL R410A Models NTXSMT09A111AA NTXSMT12A111AA Indoor unit service manual NTXWMT•A111AA Series (OBHT820) CONTENTS 1. TECHNICAL CHANGES ···································· 3 2. PART NAMES AND FUNCTIONS ····················· 4 3. SPECIFICATION ················································ 5 4.
  • 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: Technical Changes

    TECHNICAL CHANGES NTXSMT09A111AA NTXSMT12A111AA 1. New model OBHT821A...

  • Page 4: Part Names And Functions

    PART NAMES AND FUNCTIONS NTXSMT09A111AA NTXSMT12A111AA Air inlet (back and side) Piping Air outlet Drain hose Drain outlet OBHT821A...

  • Page 5: Specification

    SPECIFICATION Outdoor unit model NTXSMT09A111AA Btu/h 9,000 ( 3,800 ~ 10,000 ) Cooling 1 Capacity Rated (Minimum~Maximum) Btu/h 10,900 ( 4,500 ~ 11,800 ) Heating 47 1 Capacity Btu/h 6,700 (7,200) Heating 17 2 Rated (Maximum) 750 (240 - 850)
  • Page 6 Outdoor unit model NTXSMT12A111AA Btu/h 12,000 ( 3,800 ~ 12,200 ) Cooling 1 Capacity Rated (Minimum~Maximum) Btu/h 12,200 ( 4,500 ~ 14,500 ) Heating 47 1 Capacity Btu/h 7,600 (9,000) Heating 17 2 Rated (Maximum) 1,210 (240 - 1,300) Cooling 1 Power consumption Rated (Minimum~Maximum) 990 (240 - 1,220)

  • Page 7: Operation

    Test condition 3, 4 Indoor air condition (°F) Outdoor air condition (°F) Mode Test Dry bulb Wet bulb Dry bulb Wet bulb "A-2" Cooling steady state (75) at rated compressor speed "B-2" Cooling steady state (65) at rated compressor speed SEER "B-1"...

  • Page 8: Outlines And Dimensions

    OUTLINES AND DIMENSIONS NTXSMT09A111AA NTXSMT12A111AA Unit: inch REQUIRED SPACE 4 in. (100 mm) or more when front and sides of the unit are clear When any 2 sides of left, right and rear of the unit are clear holes Liquid refrigerant pipe joint Refrigerant pipe (flared) Ø...

  • Page 9: Wiring Diagram

    WIRING DIAGRAM NTXSMT09A111AA NTXSMT12A111AA OBHT821A...

  • Page 10: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM NTXSMT09A111AA NTXSMT12A111AA Unit: Inch (mm) Refrigerant pipe ø3/8 (ø9.52) 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature (with service port) thermistor Outdoor Muffler Discharge RT68 heat Flared connection temperature exchanger thermistor Service port...

  • Page 11: Data

    DATA NTXSMT09A111AA NTXSMT12A111AA 7-1. PERFORMANCE DATA 1) COOLING CAPACITY Indoor air Outdoor intake air DB temperature (˚F) Model IWB (˚F) SHC TPC SHC TPC SHC TPC SHC TPC SHC TPC 11.0 0.67 10.3 0.73 0.79 0.83 0.86 NTXSMT09A111AA 10.4 0.63 0.69...

  • Page 12: Performance Curve

    7-2. PERFORMANCE CURVE Cooling Cooling capacity (at Rated frequency) Indoor intake air Wet-bulb temperature( F) Outdoor intake air DB temperature(°F) NTXSMT09A111AA NTXSMT12A111AA SHF at rating condition = 0.82 SHF at rating condition = 0.77 Airflow = 399 CFM Airflow = 399 CFM Outdoor intake air DB temperature (°F)
  • Page 13 7-3. CONDENSING PRESSURE Cooling Data are based on the condition of indoor humidity 50 %. Air flow should be set to High speed. NTXSMT09A111AA (PSIG) (PSIG) 68 70 100 105 (°F) 68 70 100 105 (°F) Outdoor ambient temperature Outdoor ambient temperature...
  • Page 14 Heating Data are based on the condition of outdoor humidity 75%. Air flow should be set to High speed. Data are for heating operation without any frost. NTXSMT09A111AA NTXSMT12A111AA (PSIG) (PSIG) 58Hz 58Hz (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature...

  • Page 15: Standard Operation Data

    Indoor unit NTXWMT09A111AA Power supply V, phase, Hz 115, 1, 60 Input 0.022 0.023 Fan motor current 0.37 0.38 Outdoor unit NTXSMT09A111AA Power supply V, phase, Hz 115, 1, 60 Input 0.728 0.877 Comp. current 6.15 7.38 Fan motor current 0.48 0.54...
  • Page 16 7-4. STANDARD OPERATION DATA Model NTXWMT12A111AA Item Unit Cooling Heating Capacity Btu/h 12,000 12,200 — 0.77 — Input 1.210 0.990 Rated frequency 91.0 90.0 Indoor unit NTXWMT12A111AA Power supply V, phase, Hz 115, 1, 60 Input 0.022 0.023 Fan motor current 0.37 0.38 Outdoor unit...
  • Page 17 7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY NTXSMT09A111AA Correction of Cooling capacity Correction of Cooling total input Correction of Heating total input Correction of Heating capacity The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor...

  • Page 18: Actuator Control

    ACTUATOR CONTROL NTXSMT09A111AA NTXSMT12A111AA 8-1. OUTDOOR FAN MOTOR CONTROL The fan motor turns ON/OFF, interlocking with the compressor. [ON] The fan motor turns ON 5 seconds before the compressor starts up. [OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running.

  • Page 19: Service Functions

    SERVICE FUNCTIONS NTXSMT09A111AA NTXSMT12A111AA 9-1. CHANGE IN DEFROST SETTING Changing defrost finish temperature <JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board (Refer to 10-6.1.). Jumper Defrost finish temperature Soldered 50°F (10°C)

  • Page 20: Troubleshooting

    TROUBLESHOOTING NTXSMT09A111AA NTXSMT12A111AA 10-1. 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 main unit first with the remote controller, then after confirm- ing the horizontal vane is closed, turn off the breaker and/or disconnect the power plug.
  • Page 21 10-2. FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (10-3.) disappears, the memorized failure details can be recalled. 1.
  • Page 22 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.
  • Page 23 3. Table of outdoor unit failure mode recall function NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.). NTXSMT09A111AA NTXSMT12A111AA OPERATION Indoor/outdoor Outdoor unit INDICATOR Abnormal point LED indication unit failure Condition Remedy failure mode...
  • Page 24 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.). OPERATION Indoor/out- Outdoor unit INDICATOR Abnormal point LED indication door unit fail- Condition Remedy failure mode upper lamp (Failure mode / protection) (Outdoor P.C. board) ure mode recall function (Indoor unit)
  • Page 25 10-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time blink every Outdoor power Overcurrent protection cut-out operates 3 consecutive times • Reconnect connector of does not 2.5 seconds system within 1 minute after the compressor gets started. compressor.
  • Page 26 Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time blink Frequency drop by Current from power outlet is nearing Max. fuse size. The unit is normal, but check the operates. 2.5 seconds OFF current protection following. • Check if indoor filters are clogged. 3-time blink Frequency drop by Temperature of indoor coil thermistor exceeds 131 °F (55°C)

  • Page 27: Trouble Criterion Of Main Parts

    10-4. TROUBLE CRITERION OF MAIN PARTS NTXSMT09A111AA NTXSMT12A111AA Part name Check method and criterion Figure Defrost thermistor (RT61) Measure the resistance with a multimeter. Fin temperature thermistor Refer to 10-6. “TEST POINT DIAGRAM AND VOLTAGE”, 1. “Inverter (RT64) P.C. board”, for the chart of thermistor.

  • Page 28: Troubleshooting Flow

    10-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between the compressor and the power module (IC700) Check the voltage between terminals. See 10-5. “Check of open phase”. Are the voltages balanced? Replace the inverter P.C. board. Check the compressor. See 10-5.
  • Page 29 D Check of compressor winding ●Disconnect the connector between the compressor and the power module (IC700) and measure the resistance between the compressor terminals. <<Measurement point>> At 3 points BLK-WHT Measure the resistance between the lead wires at 3 points. BLK-RED WHT-RED <<Judgement>>...
  • Page 30 G Check of outdoor thermistors Disconnect the connector of thermistor in the inverter P.C. board (see below table), and measure the resistance of thermistor. Replace the thermistor except RT64. Is the resistance of thermistor normal? When RT64 is abnormal, replace the inverter P.C. (Refer to 10-6.1.) board.
  • Page 31 I Check of outdoor fan motor Check the connection between the connector CN931 and CN932. Disconnect the connectors CN931 and CN932 from the inverter P.C. board. Is the resistance between each terminal of outdoor fan motor normal? (Refer to 10-4.) Disconnect CN932 from the inverter P.C.
  • Page 32 J Check of power supply Disconnect the connector between the compressor and the power module (IC700). Turn ON power supply and press Rectify indoor/outdoor EMERGENCY OPERATION switch. connecting wire. Does the upper lamp of the Is there voltage 115 V AC Replace the indoor OPERATION INDICATOR lamp on between the indoor terminal...
  • Page 33 K Check of LEV (Expansion valve) Turn ON the power supply. <Preparation of the remote controller> While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. First, release RESET button. Hold down the other 2 buttons for another 3 seconds.

  • Page 34: Emergency Operation

    L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 10-5. .) Is the fuse (F901) blown on the inverter P.C. board? Check the connection of the connectors (CN931, CN932) of the outdoor fan motor. If the connection is poor, make it correct. Operate the outdoor unit by starting EMERGENCY OPERATION.
  • Page 35 M How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage in the power supply? Check the power supply. Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Check the wiring.
  • Page 36 N Check of outdoor refrigerant circuit The unit occasionally stops when the Was the operation started with Has the operation stopped stop valve is opened or closed during the stop valve closed, and was during pump down? operation. Open the stop valve and it opened during operation? start the cooling operation again.
  • Page 37 O Electromagnetic noise enters into TV sets or radios Is the unit grounded? Ground the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 9.91 ft. (3m), the indoor unit, and/or the antennas and the out- or is the distance between the antennas door unit.
  • Page 38 10-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board NTXSMT09A111AA NTXSMT12A111AA Back side of unit DB61 Smoothing Smoothing R.V. coil/21S4 260 - 370 V DC capacitor (C62) capacitor (C61) (CN721) 115 V AC Fuse (F701) Fuse (F801) 115 V AC T3.15AL250V...

  • Page 39: Disassembly Instructions

    Locking lever lever. Connector 11-1. NTXSMT09A111AA NTXSMT12A111AA : Indicates the visible parts in the photos/figures. : Indicates the invisible parts in the photos/figures. NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1.

  • Page 40: Operating Procedure

    OPERATING PROCEDURE PHOTOS/FIGURES Photo 4 Photo 5 Screws of the conduit cover Screw of the conduit plate 2. Removing the inverter assembly, inverter P.C. board Photo 6 (1) Remove the cabinet and panels. (Refer to section 1.) Screw of the heat sink (2) Disconnect the lead wire to the reactor and the following support and the separator connectors:...
  • Page 41 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the discharge temperature thermistor, Photo8 Screw of the defrost thermistor, outdoor heat exchanger tempera- Terminal block support ture thermistor and ambient temperature thermistor Heat sink support P.C. board (1) Remove the cabinet and panels. (Refer to section 1.) support Heat sink (2) Disconnect the lead wire to the reactor and the following...
  • Page 42 PHOTOS/FIGURES OPERATING PROCEDURE 5. Removing outdoor fan motor Photo 11 (1) Remove the cabinet and panels. (Refer to section 1.) Screws of the outdoor fan motor (2) Disconnect the following connectors: <Inverter P.C. board> CN931, CN932 (Fan motor) (3) Remove the propeller fan nut. (4) Remove the propeller fan.
  • Page 43 OBHT821A...
  • Page 44 MITSUBISHI ELECTRIC TRANE HVAC US LLC HEAD OFFICE: 1340 SATELLITE BOULEVARD, SUWANEE, GA 30024, USA © Copyright 2019 MITSUBISHI ELECTRIC CORPORATION Issued: Mar. 2022. No. OBHT821 REVISED EDITION-A Published: Jan. 2019. No. OBHT821 Specifications are subject to change without notice.

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