Mitsubishi Electric NTXWMT09A111AA Service Manual
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Mitsubishi Electric NTXWMT09A111AA Service Manual

Mitsubishi Electric NTXWMT09A111AA Service Manual

Indoor unit
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INDOOR UNIT
INDOOR UNIT
SERVICE MANUAL
Models
NTXWMT09A111AA
NTXWMT12A111AA
NTXWMT09A111AB
NTXWMT12A111AB
NTXWMT09A111AA
NTXWMT09A111AB
Revision C:
• Remote controller P.C. board has been added.
(7-2.)
OBHT820 REVISED EDITION-B is void.
Outdoor unit service manual
NTXSMT•A111AA Series (OBHT821)
CONTENTS
1. TECHNICAL CHANGES· ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 4
4. OUTLINES AND DIMENSIONS ························· 6
5. WIRING DIAGRAM ············································ 7
6. REFRIGERANT SYSTEM DIAGRAM ··············· 8
7. SERVICE FUNCTIONS ······································ 9
8. MICROPROCESSOR CONTROL ···················· 11
9. TROUBLESHOOTING ····································· 15
10. DISASSEMBLY INSTRUCTIONS ···················· 29
PARTS CATALOG (OBBT820)
No. OBHT820
REVISED EDITION-C

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Summary of Contents for Mitsubishi Electric NTXWMT09A111AA

  • Page 1: Table Of Contents

    (7-2.) OBHT820 REVISED EDITION-B is void. INDOOR UNIT INDOOR UNIT No. OBHT820 REVISED EDITION-C SERVICE MANUAL Models NTXWMT09A111AA NTXWMT12A111AA NTXWMT09A111AB NTXWMT12A111AB Outdoor unit service manual NTXSMT•A111AA Series (OBHT821) CONTENTS 1. TECHNICAL CHANGES· ··································· 2 2. PART NAMES AND FUNCTIONS ····················· 3 3.

  • Page 2: Technical Changes

    • 9-7. TEST POINT DIAGRAM AND VOLTAGE has been modified. Revision B: • NTXWMT09A111AB and NTXWMT12A111AB have been added. Revision C: • Remote controller P.C. board has been added. (7-2.) TECHNICAL CHANGES NTXWMT09A111AA NTXWMT12A111AA 1. New model NTXWMT09A111AA NTXWMT09A111AB NTXWMT12A111AA NTXWMT12A111AB 1.

  • Page 3: Part Names And Functions

    PART NAMES AND FUNCTIONS NTXWMT09A111AA NTXWMT12A111AA NTXWMT09A111AB NTXWMT12A111AB Air fi lter Front panel Air cleaning fi lter (Anti-Allergy Enzyme Filter, option) Air inlet Heat exchanger Air outlet Fan guard Horizontal vane Remote controller Remote control receiving section Operation indicator lamp...

  • Page 4: Specification

    SPECIFICATION NTXWMT09A111AA NTXWMT12A111AA Indoor model NTXWMT09A111AB NTXWMT12A111AB Power supply V, phase, Hz 115, 1, 60 Max. fuse size (time delay)/ Disconnect switch A Min. circuit ampacity Fan motor F.L.A 1.07 COOL Dry 399 - 321 - 237 - 170 Airflow...
  • Page 5 Function position where the air speed is 1 ft./s., (CFM) (ft./s.) (ft.) when air is blown out horizontally from HEAT 20.6 29.5 NTXWMT09A111AA the unit properly at the High speed 20.2 29.0 NTXWMT09A111AB COOL position. 18.4 26.5 The coverage should be used only as a HEAT 20.6...

  • Page 6: Outlines And Dimensions

    OUTLINES AND DIMENSIONS NTXWMT09A111AA NTXWMT12A111AA Unit: inch NTXWMT09A111AB NTXWMT12A111AB 11/16 2-1/4 Insulation ø1 - 3/8 O.D Liquid line ø1/4 19 - 11/16 (Flared connection ø1/4) Gas line ø3/8 16 - 15/16 (Flared connection: ø3/8) Drain hose Insulation ø1-1/8 O.D Connected part ø5/8 O.D...

  • Page 7: Wiring Diagram

    WIRING DIAGRAM NTXWMT09A111AA NTXWMT12A111AA NTXWMT09A111AB NTXWMT12A111AB OBHT820C...

  • Page 8: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM NTXWMT09A111AA NTXWMT12A111AA Unit: inch (mm) NTXWMT09A111AB NTXWMT12A111AB Refrigerant pipe ø3/8 (ø9.52) (with heat insulator) Indoor coil Indoor thermistor heat RT12 (main) exchanger Flared connection Indoor coil thermistor RT13 (sub) Room temperature thermistor RT11 Flared connection Refrigerant pipe ø1/4 (ø6.35)

  • Page 9: Service Functions

    SERVICE FUNCTIONS NTXWMT09A111AA NTXWMT12A111AA NTXWMT09A111AB NTXWMT12A111AB 7-1. TIMER SHORT MODE For service, the set time can be shortened by bridging of the timer short point on the indoor electronic control P.C. board. The time will be shortened as follows. (Refer to 9-7.) •...

  • Page 10: Auto Restart Function

    7-3. AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed are memorized by the indoor electronic control P.C. board. “AUTO RESTART FUNCTION” automatically starts operation in the same mode just before the shut-off of the main power.

  • Page 11: Microprocessor Control

    MICROPROCESSOR CONTROL NTXWMT09A111AA NTXWMT12A111AA NTXWMT09A111AB NTXWMT12A111AB WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section OFF/ON (stop/operate) button Fan speed control button Temperature buttons ECONO COOL button Vane control button Operation select button Timer mode select button Time set buttons RESET button NOTE: Last setting will be stored after the unit is turned OFF with the remote controller.

  • Page 12: Auto Vane Operation

    8-2. DRY ( ) OPERATION (1) Press STOP/OPERATE (OFF/ON) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select DRY mode with OPERATION SELECT button. (3) The set temperature is determined from the initial room temperature. 1.
  • Page 13 (4) VANE AUTO ( ) mode In VANE AUTO mode, the microprocessor automatically determines the vane angle to make the optimum room tempera- ture distribution. In COOL and DRY operation In HEAT operation Vane angle is fixed to Horizontal position. Vane angle is fixed to Angle 5.

  • Page 14: Emergency Heat

    8-6. EMERGENCY/TEST OPERATION In the case of test run operation or emergency operation, use the emergency operation switch on the right side of the indoor unit. Emergency operation is available when the remote controller is missing or has failed, or when the batteries in the remote controller are running down.

  • Page 15: Troubleshooting

    TROUBLESHOOTING NTXWMT09A111AA NTXWMT12A111AA NTXWMT09A111AB NTXWMT12A111AB 9-1. 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 16 9-2. 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 (9-4.) disappears, the memorized failure details can be recalled. 1.
  • Page 17 2. Table of indoor unit failure mode recall function Upper lamp of Abnormal point OPERATION Condition Remedy (Failure mode) INDICATOR lamp Not lit Normal — — The room temperature thermistor short or 1-time blink every Room temperature Refer to the characteristics of the room temperature open circuit is detected every 8 seconds dur- 0.5-second thermistor...

  • Page 18: Operation Indicator

    9-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit operates. Indoor unit operates. Indoor unit does not OPERATION INDICATOR Outdoor unit does Outdoor unit does not receive the signal from lamp on the indoor unit is not operate. operate normally. remote controller. blinking ON and OFF.
  • Page 19 9-4. TROUBLESHOOTING CHECK TABLE Before taking measures, make sure that the symptom reappears for accurate troubleshooting. When the indoor unit has started operation and detected an abnormality of the following condition (the first detection after the power ON), the indoor fan motor turns OFF and OPERATION INDICATOR lamp blinks. OPERATION INDICATOR Blinking Not lit...
  • Page 20 9-5. TROUBLESHOOTING CRITERION OF MAIN PARTS NTXWMT09A111AA NTXWMT12A111AA NTXWMT09A111AB NTXWMT12A111AB Part name Check method and criterion Figure Room temperature Measure the resistance with a multimeter. thermistor (RT11) Indoor coil thermistor Refer to 9-7. "Test point diagram and voltage", 1 or 2. "Indoor electronic (RT12, RT13) control P.C.

  • Page 21: Troubleshooting Flow

    9-6. TROUBLESHOOTING FLOW A Check of indoor fan motor The indoor fan motor error has occurred, and the indoor fan does not operate. Pay enough attention to the high voltage on the fan motor connector. Turn OFF the power supply. Turn ON the power supply, wait 5 seconds or more, and then press the emergency operation switch.
  • Page 22 B Check of remote controller and indoor electronic control P.C. board *Check if the remote controller is exclusive for this air conditioner. Press STOP/OPERATE (OFF/ON) button on the remote controller. *1 Look at the image of the signal transmitting section of the remote controller through the monitor of a digital camera or a camera phone.
  • Page 23 C Check of indoor P.C. board and indoor fan motor NTXWMT09A111AA NTXWMT12A111AA Turn OFF the power supply. Remove indoor fan motor connector CN211 from indoor power P.C. board and vane Measure the resistance between Short/ open circuit: motor connector CN151 from the indoor...
  • Page 24 NTXWMT09A111AB NTXWMT12A111AB Turn OFF the power supply. Remove indoor fan motor connector CN211 from indoor power P.C. board and vane Measure the resistance between Short/ open circuit: motor connector CN151 from the indoor CN211 of the indoor fan motor Replace the indoor fan motor. electronic control P.C.
  • Page 25 D 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 26 E 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.(3 m), the indoor unit, and/or the antennas and the or is the distance between the antennas outdoor unit.
  • Page 27 9-7. TEST POINT DIAGRAM AND VOLTAGE NTXWMT09A111AA NTXWMT12A111AA 1. Indoor power P.C. board, Indoor terminal P.C. board Indoor terminal P.C. board Indoor power P.C. board Resistor (R111) Varistor (NR11) Fuse (F11)(*) approximately 2 Ω Indoor fan motor (CN211) (+)0-6 V...
  • Page 28 NTXWMT09A111AB NTXWMT12A111AB 1. Indoor power P.C. board, Indoor terminal P.C. board Indoor terminal P.C. board Indoor power P.C. board Resistor (R111) Varistor (NR11) Fuse (F11)(*) approximately 2 Ω Indoor fan motor (CN211) (+)0-6 V (+)3-6 V DC 15 V DC (–) GND (high- voltage DC) 162 V DC...

  • Page 29: Disassembly Instructions

    Locking lever lever. Connector 10-1. NTXWMT09A111AA NTXWMT12A111AA : Indicates the visible parts in the photos/figures. NTXWMT09A111AB NTXWMT12A111AB : Indicates the invisible parts in the photos/figures. NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1.
  • Page 30 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the indoor electronic control P.C. Photo 2 Electrical box Ground wire board and the room temperature thermistor (1) Remove the panel (Refer to section 1.) and the corner box. Screw of the (2) Remove the screw of the V.A. clamp and the V.A. electrical cover clamp.
  • Page 31 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the nozzle assembly Photo 5 (1) Remove the panel (Refer to section 1.) and the corner box. (2) Remove the indoor/outdoor connecting wire (Refer to section 2 (2)-(7).). (3) Remove the indoor electronic control P.C. board hold- (4) Pull out the drain hose from the nozzle assembly and remove the nozzle assembly.
  • Page 32 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the indoor fan motor, the indoor coil Photo 6 thermistor, and the line flow fan (1) Remove the panel (Refer to section 1.) and the corner box. (2) Remove the indoor electronic control P.C. board hold- er, the electrical box and the nozzle assembly.
  • Page 33 Fixing the indoor coil thermistor * There are 2 forms of parts for fixing the indoor coil thermistor. When fixing the indoor coil thermistor to the clip-shape/holder-shape part, the Clip shape Holder shape lead wire should point down. About the same length Position and procedure for mounting the clip-shape part 1.
  • Page 34 MITSUBISHI ELECTRIC TRANE HVAC US LLC HEAD OFFICE: 1340 SATELLITE BOULEVARD, SUWANEE, GA 30024, USA © Copyright 2019 MITSUBISHI ELECTRIC CORPORATION Issued: Sep. 2023. No. OBHT820 REVISED EDITION-C Issued: Mar. 2023. No. OBHT820 REVISED EDITION-B Issued: Nov. 2021. No. OBHT820 REVISED EDITION-A Published: Jan.

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