Mitsubishi Electric American Standard NAXWST06B112AA Service Manual
  1. Manuals
  2. Brands
  3. Mitsubishi Electric Manuals
  4. Air Conditioner
  5. American Standard NAXWST06B112AA
  6. Service manual
Mitsubishi Electric American Standard NAXWST06B112AA Service Manual

Mitsubishi Electric American Standard NAXWST06B112AA Service Manual

Indoor unit
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
INDOOR UNIT
SERVICE MANUAL
Models
NAXWST18B112AA
Revision A:
• NAXWST06/09/12/15/18/24B112AA,
NAYWST09/12/15/18/24B112AA,
NAXWST30/36C112AA and
NAYWST30/36C112AA have been added.
OBHA874 is void.
NAYWST09B112AA
NAYWST12B112AA
NAYWST15B112AA
NAYWST18B112AA
NAYWST24B112AA
NAYWST30B112AA
NAYWST36B112AA
NAYWST30C112AA
NAYWST36C112AA
Outdoor unit service manual
NAXSST/NAYSST•B•AA Series (OBHA875)
CONTENTS
1. TECHNICAL CHANGES· ·····························2
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································7
4. OUTLINES AND DIMENSIONS ··················· 10
5. WIRING DIAGRAM ··································· 12
6. REFRIGERANT SYSTEM DIAGRAM ··········· 15
7. SERVICE FUNCTIONS ······························ 17
8. MICROPROCESSOR CONTROL ················· 20
9. TROUBLESHOOTING ······························· 34
10. DISASSEMBLY INSTRUCTIONS ················· 59
PARTS CATALOG (OBBA874)
No. OBHA874
REVISED EDITION-A

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the American Standard NAXWST06B112AA and is the answer not in the manual?

Questions and answers

Related Manuals for Mitsubishi Electric American Standard NAXWST06B112AA

Summary of Contents for Mitsubishi Electric American Standard NAXWST06B112AA

  • Page 1: Table Of Contents

    Revision A: • NAXWST06/09/12/15/18/24B112AA, NAYWST09/12/15/18/24B112AA, NAXWST30/36C112AA and NAYWST30/36C112AA have been added. OBHA874 is void. INDOOR UNIT No. OBHA874 REVISED EDITION-A SERVICE MANUAL Models NAXWST06B112AA NAYWST09B112AA NAXWST09B112AA NAYWST12B112AA NAXWST12B112AA NAYWST15B112AA NAXWST15B112AA NAYWST18B112AA NAXWST18B112AA NAYWST24B112AA NAXWST24B112AA NAYWST30B112AA NAXWST30B112AA NAYWST36B112AA NAXWST36B112AA NAYWST30C112AA NAXWST30C112AA NAYWST36C112AA NAXWST36C112AA Outdoor unit service manual...

  • Page 2: Naxwst06B112Aa

    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 NAXWST06B112AA NAXWST09B112AA NAXWST12B112AA NAXWST15B112AA NAYWST09B112AA NAYWST12B112AA NAYWST15B112AA Front panel Air fi lter (Nano platinum fi lter) Air cleaning fi lter (Anti-Allergy Enzyme Filter) Air inlet Air outlet Remote controller Fan guard Heat exchanger Horizontal vane Remote control receiving section Operation indicator lamp Emergency operation switch ACCESSORIES...
  • Page 4 NAXWST18B112AA NAYWST18B112AA Air inlet Front panel Air fi lter (Nano platinum fi lter) Air cleaning fi lter Heat exchanger (Anti-Allergy Enzyme Filter) Air outlet Fan guard Horizontal vane Remote controller Remote control receiving section Operation indicator lamp Emergency operation switch ACCESSORIES (1) Installation plate (2) Installation plate fixing screw 4 ×...
  • Page 5 NAXWST24B112AA NAYWST24B112AA Front panel Air fi lter (Nano platinum filter) Air cleaning filter (Electrostatic anti-allergy enzyme filter) Air inlet Air outlet Remote controller Fan guard Heat exchanger Horizontal vane Operation indicator lamp Emergency operation switch Remote control receiving section ACCESSORIES (1) Installation plate (2) Installation plate fixing screw 4 ×...
  • Page 6 NAXWST30B112AA NAXWST36B112AA NAXWST30C112AA NAYWST30C112AA NAYWST30B112AA NAYWST36B112AA NAXWST36C112AA NAYWST36C112AA Air cleaning fi lter (Anti-Allergy Enzyme Filter) Front panel Air fi lter (Nano platinum filter) Air inlet Emergency operation switch NAXWST30/36B112AA NAXWST30/36C112AA NAYWST30/36B112AA NAYWST30/36C112AA Air outlet Horizontal vane Operation indicator lamp Fan guard Remote control receiving section Remote controller...

  • Page 7: Specification

    SPECIFICATION NAXWST09B112AA NAXWST12B112AA Indoor model NAXWST06B112AA NAYWST09B112AA NAYWST12B112AA Power supply V, phase, Hz 208/230, 1, 60 Disconnect switch Min. circuit ampacity Fan motor F.L.A 0.75 Airflow COOL Dry 381 - 307 - 222 - 160 - 134 (Wet) (343 - 276 - 200 - 144 - 121) Super High - High - Med.
  • Page 8 Model NAXWST30B112AA NAYWST30B112AA NAXWST36B112AA NAYWST36B112AA NAXWST30C112AA NAYWST30C112AA NAXWST36C112AA NAYWST36C112AA Power supply V, phase, Hz 208/230 , 1 , 60 Disconnect switch Min. circuit ampacity Fan motor F.L.A 0.76 Airflow COOL Dry 915 - 699 - 602 - 374 932-710-613-379 (Wet) (823 - 629 - 542 - 336) (839-639-552-341) Super High - High...

  • Page 9: Outlet Air Speed And Coverage Range

    3-1. OPERATING RANGE (1) POWER SUPPLY Rated voltage Guaranteed voltage (V) 208/230 V Min. 187 Max. 253 Indoor unit 1 phase 60 Hz (2) OPERATION Intake air temperature (°F) Mode Condition Standard temperature Maximum temperature Cooling Minimum temperature Maximum humidity Standard temperature Heating Maximum temperature...

  • Page 10: Outlines And Dimensions

    OUTLINES AND DIMENSIONS NAXWST06B112AA NAXWST09B112AA NAXWST12B112AA NAXWST15B112AA NAYWST09B112AA NAYWST12B112AA NAYWST15B112AA Unit: inch 2-3/8 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 (WST06/09/12B112AA), ø1/2 (WST15B112AA)) Drain hose Insulation ø1-5/32 O.D Connected part ø5/8 O.D NAXWST18B112AA NAYWST18B112AA...
  • Page 11 NAXWST24B112AA Unit: inch NAYWST24B112AA NAXWST30B112AA NAXWST36B112AA NAXWST30C112AA NAYWST30C112AA NAYWST30B112AA NAYWST36B112AA NAXWST36C112AA NAYWST36C112AA Indoor unit 2-11/16 4-11/16 45-1/2 2-3/16 20-7/8 17-11/16 5-3/8 11-5/8 Wall hole ø3 Air in 46-1/16 Installation plate Piping Drain hose 2-15/16 33-11/16 9-1/2 2-5/8 NAXWST30B112AA NAXWST30C112AA NAYWST30B112AA NAYWST30C112AA Air out 5-7/8...

  • Page 12: Wiring Diagram

    WIRING DIAGRAM NAXWST06B112AA NAXWST09B112AA NAXWST12B112AA NAXWST15B112AA NAYWST09B112AA NAYWST12B112AA NAYWST15B112AA NAXWST18B112AA NAYWST18B112AA OBHA874A...
  • Page 13 NAXWST24B112AA NAYWST24B112AA NAXWST30B112AA NAXWST36B112AA NAYWST30B112AA NAYWST36B112AA OBHA874A...
  • Page 14 NAXWST30C112AA NAYWST30C112AA NAXWST36C112AA NAYWST36C112AA OBHA874A...

  • Page 15: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM NAXWST06B112AA NAXWST09B112AA NAXWST12B112AA NAXWST15B112AA NAYWST09B112AA NAYWST12B112AA NAYWST15B112AA Unit: inch (mm) Refrigerant pipe ø3/8 (ø9.52) (NAXWST06/09/12B112AA, NAYWST09/12B112AA) ø1/2 (ø12.7) (NAXWST15B112AA, NAYWST15B112AA) (with heat insulator) Indoor coil Indoor thermistor heat RT12 (main) exchanger Flared connection Indoor coil thermistor RT13 (sub) Room temperature thermistor RT11...
  • Page 16 NAXWST24B112AA Unit : inch (mm) NAYWST24B112AA Refrigerant pipe ø5/8 (ø15.88) (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 (Only NAX) NAXWST30B112AA NAXWST36B112AA NAXWST30C112AA NAYWST30C112AA...

  • Page 17: Service Functions

    SERVICE FUNCTIONS NAXWST06B112AA NAXWST09B112AA NAXWST12B112AA NAXWST15B112AA NAXWST18B112AA NAXWST24B112AA NAXWST30B112AA NAXWST36B112AA NAXWST30C112AA NAXWST36C112AA NAYWST09B112AA NAYWST12B112AA NAYWST15B112AA NAYWST18B112AA NAYWST24B112AA NAYWST30B112AA NAYWST36B112AA NAYWST30C112AA NAYWST36C112AA 7-1. TIMER SHORT MODE For service, the following set time can be shortened by bridging the timer short mode point on the electronic control P.C. board.
  • Page 18 NAXWST06B112AA NAXWST09B112AA NAXWST12B112AA NAXWST15B112AA NAXWST18B112AA NAXWST24B112AA NAXWST30C112AA NAXWST36C112AA NAYWST09B112AA NAYWST12B112AA NAYWST15B112AA NAYWST18B112AA NAYWST24B112AA NAYWST30C112AA NAYWST36C112AA To operate the indoor units individually with each remote controller, assign a number to each remote controller according to the number of the indoor unit. This setting can be set only when all the following conditions are met: •...

  • Page 19: 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 shutoff of the main power.

  • Page 20: Microprocessor Control

    MICROPROCESSOR CONTROL NAXWST06B112AA NAXWST09B112AA NAXWST12B112AA NAXWST15B112AA NAXWST18B112AA NAXWST24B112AA NAXWST30B112AA NAXWST36B112AA NAXWST30C112AA NAXWST36C112AA NAYWST09B112AA NAYWST12B112AA NAYWST15B112AA NAYWST18B112AA NAYWST24B112AA NAYWST30B112AA NAYWST36B112AA NAYWST30C112AA NAYWST36C112AA WIRELESS REMOTE CONTROLLER These pictures show NAX type. NAXWST06B112AA NAXWST09B112AA NAXWST12B112AA NAXWST15B112AA NAYWST09B112AA NAYWST12B112AA NAYWST15B112AA Signal transmitting section Distance of signal : About 20 ft.
  • Page 21 NAXWST24B112AA NAYWST24B112AA Signal transmitting section Distance of signal : Battery replacement indicator About 20 ft. (6 m) Beep(s) is (are) heard from the indoor unit when the signal is received. FAN speed control button Operation select button WIDE VANE button ECONO COOL button VANE control button POWERFUL button...
  • Page 22 NAXWST30B112AA NAXWST36B112AA NAYWST30B112AA NAYWST36B112AA Signal transmitting section Distance of signal : About 20 ft. (6 m) Beep(s) is (are) heard from the indoor unit when the signal is received. Operation display section Battery replacement indicator VANE control button (Horizontal vane button) FAN speed control button OFF/ON (stop/operate) button...
  • Page 23 NAXWST30C112AA NAYWST30C112AA NAXWST36C112AA NAYWST36C112AA Signal transmitting section Distance of signal : Battery replacement indicator About 20 ft. (6 m) Beep(s) is (are) heard from the indoor unit when the signal is received. FAN speed control button Operation select button WIDE VANE button ECONO COOL button VANE control button POWERFUL button...

  • Page 24: Operation

    8-1. COOL ( ) OPERATION (1) Press OFF/ON (stop/operate) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with Operation select button. (3) Press Temperature buttons (TEMP button/TOO WARM or TOO COOL button) to select the desired temperature. The setting range is 61 ~ 88°F (16 ~ 31°C) 1.
  • Page 25 (4) The initial set temperature is decided by the initial room temperature. Model Initial room temperature Initial set temperature 79°F (26°C) or more 75°F (24°C) COOL mode of “I FEEL CONTROL” 77°F (25°C) to 79°F (26°C) Initial room temperature minus 4°F (2°C) DRY mode of “I FEEL More than 55°F (13°C), Initial room temperature minus 4°F (2°C)

  • Page 26: Auto Vane Operation

    NOTE 2 FOR MULTI SYSTEM AIR CONDITIONER (NAXWST06/09/12/15/18/24) OUTDOOR UNIT: MXZ series Multi system air conditioner can connect 2 or more indoor units with 1 outdoor unit. • When you try to operate 2 or more indoor units with 1 outdoor unit simultaneously, 1 for the cooling and the others for heating, the operation mode of the indoor unit that operates first is selected.
  • Page 27 NAXWST18/24/30/36B112AA NAXWST30/36C112AA NAYWST18/24/30/36B112AA NAYWST30/36C112AA In COOL and DRY operation In HEAT operation (NAX) FAN operation (NAY) Vane angle is fixed to Angle 4. Vane angle is fixed to Horizontal position. (5) STOP (operation OFF) and ON TIMER standby In the following cases, the horizontal vane returns to the closed position. (a) OFF/ON (stop/operate) button is pressed (POWER OFF).

  • Page 28: Swing Mode

    2. Vertical vane (NAXWST18/24/30/36B112AA NAYWST18/24/30/36B112AA NAXWST30/36C112AA NAYWST30/36C112AA) (1) Vane motor drive These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approximately 12 V) transmitted from microprocessor. (2) The vertical vane angle and mode change as follows by pressing WIDE VANE button.

  • Page 29: Program Timer

    8-8. TIMER OPERATION (NAXWST30/36B112AA NAYWST30/36B112AA) 1. How to set the time (1) Check that the current time is set correctly. NOTE : Timer operation will not work without setting the current time. Initially “0:00” blinks at the current time display of TIME MONITOR, so set the current time correctly with CLOCK button.

  • Page 30: Timer Operation

    8-9. TIMER OPERATION (NAXWST06/09/12/15/18/24B112AA NAYWST09/12/15/18/24B112AA NAXWST30/36C112AA NAYWST30/36C112AA) 1. How to set the time (1) Check that the current time is set correctly. NOTE: Timer operation will not work without setting the current time. Initially “12:00 AM” blinks at the current time dis- play of TIME MONITOR, so set the current time correctly with CLOCK button.

  • Page 31: Weekly Timer Operation

    8-10. WEEKLY TIMER OPERATION (NAXWST06/09/12/15/18/24B112AA NAYWST09/12/15/18/24B112AA NAXWST30/36C112AA NAYWST30/36C112AA) • A maximum of 4 ON or OFF timers can be set for individual days of the week. • A maximum of 28 ON or OFF timers can be set for a week. E.g.
  • Page 32 (4) Press button to complete and transmit the weekly timer setting. which was blinking goes out, and the current time will be displayed. NOTE: • Press button to transmit the setting information of weekly timer to the indoor unit. Point the remote controller toward the indoor unit for 3 seconds.

  • Page 33: Emergency/Test Operation

    8-12. EMERGENCY/TEST OPERATION In case of test run operation or emergency operation, use the emergency operation switch on the front of the indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of the remote controller run down.

  • Page 34: Troubleshooting

    TROUBLESHOOTING NAXWST06B112AA NAXWST09B112AA NAXWST12B112AA NAXWST15B112AA NAXWST18B112AA NAXWST24B112AA NAXWST30B112AA NAXWST36B112AA NAXWST30C112AA NAXWST36C112AA NAYWST09B112AA NAYWST12B112AA NAYWST15B112AA NAYWST18B112AA NAYWST24B112AA NAYWST30B112AA NAYWST36B112AA NAYWST30C112AA NAYWST36C112AA 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.
  • Page 35 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. This mode is very useful when the unit needs to be repaired for the abnormality which does not recur.
  • Page 36 2. Table of indoor unit failure mode recall function Upper/Left lamp of Abnormal point OPERATION Condition Remedy (Failure mode) INDICATOR lamp Not lit Normal — — The room temperature thermistor short or open 1-time blink every Room temperature Refer to the characteristics of the room temperature circuit is detected every 8 seconds during 0.5-second thermistor...
  • Page 37 9-3. INSTRUCTION OF TROUBLESHOOTING NOTE: If blinking of OPERATION INDICATOR lamp cannot be checked, it can be checked with failure mode recall function. *1 “Test Run operation” means the operation within Start 30 minutes after the emergency operation switch is pressed. Indoor unit operates.

  • Page 38: Operation Indicator

    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. NAXWST06B112AA NAXWST09B112AA NAXWST12B112AA NAXWST15B112AA NAXWST18B112AA NAXWST24B112AA NAYWST09B112AA NAYWST12B112AA NAYWST15B112AA NAYWST18B112AA...
  • Page 39 OPERATION INDICATOR Blinking Not lit Abnormal Remedy Operation indicator lamp Symptom Condition point Upper lamp lights and lower lamp blinks. The operation mode of the each indoor unit is MXZ type Outdoor unit differently set to COOL (includes DRY) and •...
  • Page 40 9-5. TROUBLESHOOTING CRITERION OF MAIN PARTS NAXWST06B112AA NAXWST09B112AA NAXWST12B112AA NAXWST15B112AA NAXWST18B112AA NAXWST24B112AA \NAXWST30B112AA NAXWST36B112AA NAXWST30C112AA NAXWST36C112AA NAYWST09B112AA NAYWST12B112AA NAYWST15B112AA NAYWST18B112AA NAYWST24B112AA NAYWST30B112AA NAYWST36B112AA NAYWST30C112AA NAYWST36C112AA Part name Check method and criterion Figure Room temperature thermistor Measure the resistance with a multimeter. (RT11) Indoor coil thermistor Refer to 9-7.

  • Page 41: Troubleshooting Flow

    9-6. TROUBLESHOOTING FLOW A Check of indoor fan motor NAXWST06/09/12/15/18B112AA NAYWST09/12/15/18B112AA 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 42 NAXWST24B112AA NAYWST24B112AA The indoor fan motor error has occurred, and the indoor fan does not operate. Turn OFF the power supply. Pay enough attention to the high voltage on the fan motor connector. Turn ON the power supply, wait 5 seconds or more, and then press the emergency operation switch.
  • Page 43 NAXWST30/36B112AA NAXWST30/36C112AA NAYWST30/36B112AA NAYWST30/36C112AA The indoor fan motor error has occurred, and the indoor fan does not operate. Turn OFF the power supply. Pay enough attention to the high voltage on the fan motor connector CN211. Turn ON the power supply, wait 5 seconds or more, and then press the emergency operation switch.
  • Page 44 B Check of remote controller and receiver P.C. board Check if the remote controller is exclusive for this air conditioner. NAXWST06/09/12/15/18B112AA NAYWST09/12/15/18B112AA Press OFF/ON (stop/operate) button *1 Look at the image of the signal transmitting section of on the remote controller. the remote controller through the monitor of a digital camera or a camera phone.
  • Page 45 Check if the remote controller is exclusive for this air conditioner. NAXWST30/36B112AA NAXWST30/36C112AA NAYWST30/36B112AA NAYWST30/36C112AA Switch ON the remote controller. Is LCD display on the remote controller Replace the batteries. (Refer to 9-1.4.) visible? (Not clear) Remove the batteries, then set them back and press RESET button.
  • Page 46 C Check of indoor electronic control P.C. board and indoor fan motor NAXWST06/09/12/15B112AA NAYWST09/12/15B112AA Turn OFF the power supply. Remove indoor fan motor connector CN211 from indoor power P.C. board and vane Measure the resistance between Short circuit: motor connector CN151 from the indoor CN211 of the indoor fan motor Replace the indoor fan motor.
  • Page 47 NAXWST18B112AA NAYWST18B112AA 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 and CN152 from CN211 of the indoor fan motor Replace the indoor fan motor. the indoor electronic control P.C.
  • Page 48 NAXWST24B112AA NAYWST24B112AA Turn OFF the power supply. Remove indoor fan motor connector CN211 and vane motor Short/ open circuit: Measure the resistance between CN211 Replace the indoor fan motor. connector CN151 from the indoor electronic control P.C. board of the indoor fan motor connector. and turn ON the power supply.
  • Page 49 NAXWST30/36B112AA NAXWST30/36C112AA NAYWST30/36B112AA NAYWST30/36C112AA Turn OFF the power supply. Remove indoor fan motor connector CN211 Measure the resistance between Short circuit: CN211 of the indoor fan motor and vane motor connector CN151 from the Replace the indoor fan motor. connector. indoor electronic control P.C.
  • Page 50 D How to check miswiring and serial signal error NAXWST06/09/12/15B112AA Turn OFF the power supply. NAYWST09/12/15B112AA 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 51 NAXWST18/24B112AA NAYWST18/24B112AA 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. Press the emergency operation switch once. Does the OPERATION INDICATOR lamp light up? <Confirmation of the power to the indoor unit>...
  • Page 52 NAXWST30/36B112AA NAYWST30/36B112AA NAXWST30/36C112AA Turn OFF the power supply. NAYWST30/36C112AA Is there rated voltage AC in Check the power supply. the power supply? Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and Check the wiring. Press the emergency operation switch once.
  • Page 53 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., or is the indoor unit, and/or the antennas and the out- the distance between the antennas and door unit.
  • Page 54 9-7. TEST POINT DIAGRAM AND VOLTAGE NAXWST06B112AA NAXWST09B112AA NAXWST12B112AA NAXWST15B112AA NAYWST09B112AA NAYWST12B112AA NAYWST15B112AA 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) Indoor fan motor (CN211) (+)0-6 V (+)3-6 V DC 15 V DC Fuse...
  • Page 55 NAXWST18B112AA NAYWST18B112AA 3. Indoor power P.C. board Connector to indoor electronic 12 V DC 5 V DC control P.C. board (CN20A) Connector to Terminal block (CN201) Fuse (F11) T3.15AL250V Varistor (NR11) Connector to Indoor fan Resistor (R111) motor (CN211) 294/325 V DC (+)0 or 15 V DC (-) GND (High (+)3-6 V DC...
  • Page 56 NAXWST24B112AA NAYWST24B112AA 5. Indoor terminal P.C. board, Indoor electronic control P.C. board, Power monitor receiver SW P.C. board Indoor terminal P.C. board Indoor electronic control P.C. board To disable “Auto restart function” Timer short mode point cut the Jumper wire to JR77. (Refer to 7-1.) Terminal Varistor...
  • Page 57 NAXWST30B112AA NAXWST36B112AA NAYWST30B112AA NAYWST36B112AA 6. Indoor electronic control P.C. board, switch P.C. board, display P.C. board, power monitor receiver P.C. board Connector to Indoor (+)0 or 15 V DC fan motor (CN211) (+)3-6 V DC Indoor electronic control P.C. board 15 V DC Timer short To disable “Auto restart function”,...
  • Page 58 NAXWST30C112AA NAXWST36C112AA NAYWST30C112AA NAYWST36C112AA 7. Indoor electronic control P.C. board, switch P.C. board, display P.C. board, power monitor receiver P.C. board Connector to Indoor (+)0 or 15 V DC fan motor (CN211) (+)3-6 V DC 15 V DC Indoor electronic control P.C. board (-) GND To disable “Auto restart function”, Timer short...

  • Page 59: 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 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 60 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 61 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 holder. (4) Pull out the drain hose from the nozzle assembly and remove the nozzle assembly.
  • Page 62 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 holder, the electrical box and the nozzle assembly.
  • Page 63 10-2. NAXWST18B112AA NAYWST18B112AA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the panel Photo 1 (1) Remove the screw caps on the panel and remove the Front panel screws of the panel. (2) Pull the panel slightly toward you, and then remove the panel by pushing it upward.
  • Page 64 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the indoor power P.C. board and the Photo 2 electrical box Water cover (1) Remove the panel. (Refer to section 1.) Remove the Screws of the Screw of the right corner box. ground plate electrical cover (2) Disconnect the following connectors: <Indoor electronic control P.C.
  • Page 65 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the indoor electronic control P.C. Photo 5 board Control P.C. board holder (Inside) (1) Remove the panel. (Refer to section 1.) Remove the right Catch corner box. (2) Disconnect the following connectors: Indoor electronic <Indoor electronic control P.C. board> control P.C.
  • Page 66 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the indoor fan motor, the indoor coil Photo 7 thermistor and the line flow fan (1) Remove the panel. (Refer to section 1.) Remove the right corner box. (2) Remove the control P.C. board holder, the water cover, the electrical box and the nozzle assembly.
  • Page 67 10-3. NAXWST24B112AA NAYWST24B112AA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the panel Photo 1 (1) Remove the horizontal vanes. Front panel Horizontal vanes (2) Remove the screw caps of the panel. Remove the screws of the panel. (3) Hold the lower part of both ends of the panel and pull it slightly toward you, and then remove the panel by pushing it upward.
  • Page 68 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the nozzle assembly Photo 4 (1) Remove the panel (Refer to section 1.) and the right corner box. (2) Remove the V.A. clamp, and then the indoor/outdoor connecting wire. (Refer to section 2 (2)-(4).) (3) Remove the electrical cover. (Photo 2) (4) Disconnect the following connector on the electronic control P.C.
  • Page 69 OPERATING PROCEDURE PHOTOS/FIGURES 7. Removing the water cut, the indoor fan motor, Photo 8 the indoor coil thermistor, and the line flow fan (1) Remove the panel (Refer to section 1.) and the right corner box. (2) Remove the power monitor receiver holder, the electri- cal box and the nozzle assembly.
  • Page 70 10-4. NAXWST30B112AA NAXWST36B112AA NAYWST30B112AA NAYWST36B112AA NAXWST30C112AA NAXWST36C112AA NAYWST30C112AA NAYWST36C112AA NOTE : Turn OFF power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the panel Photo 1 (1) Hold both sides of the front panel and lift the front panel until Front panel it is level, and then pull the hinges forward to remove the front panel.
  • Page 71 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the nozzle assembly Photo 3 (1) Remove the panel and the corner box. (Refer to section 1.) (2) Remove the electrical cover. (Refer to section 2.) (3) Remove the electrical side cover. (4) Disconnect the following connector on the electronic P.C. Screw of electrical board.
  • Page 72 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the line flow fan and the indoor fan motor Photo 7 (1) Remove the panel and the corner box. (Refer to section 1.) (2) Remove the electrical box. (Refer to section 2.) (3) Remove the nozzle assembly. (Refer to section 3.) Screw of the motor band (4) Remove the water cover.
  • Page 73 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 74 MITSUBISHI ELECTRIC TRANE HVAC US LLC HEAD OFFICE: 1340 SATELLITE BOULEVARD, SUWANEE, GA 30024, USA © Copyright 2021 MITSUBISHI ELECTRIC CORPORATION Issued: Oct. 2022. No. OBHA874 REVISED EDITION-A Published: Feb. 2021. No. OBHA874 Made in Japan Specifications subject to change without notice.

This manual is also suitable for:

American standard naxwst09b112aaAmerican standard naxwst12b112aaAmerican standard naxwst15b112aaAmerican standard naxwst18b112aaAmerican standard naxwst24b112aaAmerican standard naxwst30b112aa ... Show all

Table of Contents