Mitsubishi Electric American Standard NAXSMT-A111AA Series Service Manual
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Mitsubishi Electric American Standard NAXSMT-A111AA Series Service Manual

Indoor unit, outdoor unit
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INDOOR UNIT
INDOOR UNIT
SERVICE MANUAL
Models
NAXWMT09A111AA
NAXWMT12A111AA
NAXWMT09A111AB
NAXWMT12A111AB
NAXWMT09A111AA
NAXWMT09A111AB
Revision C:
• Remote controller P.C. board has been added.
(7-2.)
OBHA820 REVISED EDITION-B is void.
Outdoor unit service manual
NAXSMT•A111AA Series (OBHA821)
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 (OBBA820)
No. OBHA820
REVISED EDITION-C

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  • Page 1: Table Of Contents

    Revision C: • Remote controller P.C. board has been added. (7-2.) INDOOR UNIT INDOOR UNIT OBHA820 REVISED EDITION-B is void. No. OBHA820 REVISED EDITION-C SERVICE MANUAL Models NAXWMT09A111AA NAXWMT12A111AA NAXWMT09A111AB NAXWMT12A111AB Outdoor unit service manual NAXSMT•A111AA Series (OBHA821) CONTENTS 1. TECHNICAL CHANGES· ··································· 2 2.

  • Page 2: Technical Changes

    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: Part Names And Functions

    PART NAMES AND FUNCTIONS NAXWMT09A111AA NAXWMT12A111AA NAXWMT09A111AB NAXWMT12A111AB 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 Emergency operation switch ACCESSORIES Installation plate...

  • Page 4: Specification

    SPECIFICATION NAXWMT09A111AA NAXWMT12A111AA Indoor model NAXWMT09A111AB NAXWMT12A111AB 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 (Wet) (364 - 286 - 201 - 134) Super High - High - Med.
  • Page 5 3-1. OPERATING RANGE (1) POWER SUPPLY Rated voltage Guaranteed voltage (V) 115 V Min. 103 Max. 127 Indoor unit 1 phase 60 Hz (2) OPERATION Intake air temperature (°F) Mode Condition Indoor Outdoor Standard temperature — Maximum temperature — Cooling Minimum temperature —...

  • Page 6: Outlines And Dimensions

    OUTLINES AND DIMENSIONS NAXWMT09A111AA NAXWMT12A111AA Unit: inch NAXWMT09A111AB NAXWMT12A111AB 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 OBHA820C...

  • Page 7: Wiring Diagram

    WIRING DIAGRAM NAXWMT09A111AA NAXWMT12A111AA NAXWMT09A111AB NAXWMT12A111AB OBHA820C...

  • Page 8: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM NAXWMT09A111AA NAXWMT12A111AA Unit: inch (mm) NAXWMT09A111AB NAXWMT12A111AB 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) (with heat insulator) Refrigerant flow in cooling Refrigerant flow in heating...

  • Page 9: Service Functions

    SERVICE FUNCTIONS NAXWMT09A111AA NAXWMT12A111AA NAXWMT09A111AB NAXWMT12A111AB 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 NAXWMT09A111AA NAXWMT12A111AA NAXWMT09A111AB NAXWMT12A111AB 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 NAXWMT09A111AA NAXWMT12A111AA NAXWMT09A111AB NAXWMT12A111AB 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 NAXWMT09A111AA NAXWMT12A111AA NAXWMT09A111AB NAXWMT12A111AB 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 NAXWMT09A111AA NAXWMT12A111AA 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.
  • Page 24 NAXWMT09A111AB NAXWMT12A111AB 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 NAXWMT09A111AA NAXWMT12A111AA 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-...
  • Page 28 NAXWMT09A111AB NAXWMT12A111AB 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

    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 2 types of 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 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. OBHA820 REVISED EDITION-C Issued: Mar. 2023. No. OBHA820 REVISED EDITION-B Issued: Nov. 2021. No. OBHA820 REVISED EDITION-A Published: Jan.

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American standard naxwmt09a111aaAmerican standard naxwmt12a111aaAmerican standard naxwmt09a111abAmerican standard naxwmt12a111ab

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