Mitsubishi Electric MSZ-HM15NA Service Manual
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Mitsubishi Electric MSZ-HM15NA Service Manual

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INDOOR UNIT
INDOOR UNIT
SERVICE MANUAL
Models
MSZ-HM09NA
MSZ-HM12NA
MSZ-HM15NA
MSZ-HM18NA
MSZ-HM24NA
MSZ-HM24NA
Revision D:
• MSZ-HM09/12/15NA -
-
U1
,
U2
-
U1
,
U2
-
U1
,
U2
-
U1
-
U1
Outdoor unit service manual
MUZ-HM•NA Series (OBH747)
CONTENTS
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 5
4. OUTLINES AND DIMENSIONS ························ 7
5. WIRING DIAGRAM ············································ 8
6. REFRIGERANT SYSTEM DIAGRAM ············· 10
7. SERVICE FUNCTIONS ··································· 11
8. MICROPROCESSOR CONTROL ··················· 13
9. TROUBLESHOOTING ····································· 17
10. DISASSEMBLY INSTRUCTIONS ···················· 32
PARTS CATALOG (OBB746)
have been added.
U2
OBH746 REVISED EDITION-C is void.
No. OBH746
REVISED EDITION-D
·······································
2

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Summary of Contents for Mitsubishi Electric MSZ-HM15NA

  • Page 1: Table Of Contents

    OBH746 REVISED EDITION-C is void. INDOOR UNIT INDOOR UNIT No. OBH746 REVISED EDITION-D SERVICE MANUAL Models MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA MSZ-HM18NA MSZ-HM24NA Outdoor unit service manual MUZ-HM•NA Series (OBH747) CONTENTS 1. TECHNICAL CHANGES ······································· 2. PART NAMES AND FUNCTIONS ····················· 3 3.

  • Page 2: Technical Changes

    • 9-7. TEST POINT DIAGRAM AND VOLTAGE has been modified. Revision D: • MSZ-HM09/12/15NA - have been added. TECHNICAL CHANGES MSZ-HM24NA 1. New model MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA MSZ-HM18NA 1. New model MSZ-HM09NA MSZ-HM09NA MSZ-HM12NA MSZ-HM12NA MSZ-HM15NA MSZ-HM15NA 1. Indoor electronic control P.C. board and indoor power P.C. board have been changed.

  • Page 3: Part Names And Functions

    PART NAMES AND FUNCTIONS MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA Air fi lter Front panel Air cleaning fi lter (Anti-Allergy Enzyme Filter, option) Air inlet Heat exchanger Air outlet Horizontal vane Remote controller Remote control receiving section Operation indicator lamp Emergency operation switch...
  • Page 4 MSZ-HM18NA MSZ-HM24NA Air inlet Front panel Air fi lter Air cleaning fi lter Heat exchanger (Anti-Allergy Enzyme Filter, option) Air outlet Horizontal vane Remote controller Remote control receiving section Operation indicator lamp Emergency operation switch ACCESSORIES Installation plate Attachment screws for the installation plate 4 ×...

  • Page 5: Specification

    SPECIFICATION Indoor model MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA Power supply V, phase, Hz 208/230, 1, 60 Max. fuse size (time delay)/ Disconnect switch A Min. circuit ampacity Fan motor F.L.A 0.76 COOL Dry 399 - 321 - 237 - 170 533 - 420 - 335 - 272...
  • Page 6 HEAT 20.6 29.5 ing to the size of the room and furniture MSZ-HM12NA 16.3 23.5 arranged inside the room. COOL 14.5 21.0 HEAT 23.4 33.5 MSZ-HM15NA 21.3 30.5 COOL 19.5 28.0 HEAT 28.5 42.6 MSZ-HM18NA 28.5 42.6 COOL 25.6 38.4 HEAT 32.0...

  • Page 7: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: inch MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA 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 (HM09/12NA), ø1/2 (HM15NA)) Drain hose Insulation ø1-1/8 O.D Connected part ø5/8 O.D MSZ-HM18NA MSZ-HM24NA 7/16×13/16...

  • Page 8: Wiring Diagram

    WIRING DIAGRAM MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA OBH746D...
  • Page 9 MSZ-HM18NA MSZ-HM24NA OBH746D...

  • Page 10: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA Unit: inch (mm) Refrigerant pipe ø3/8 (ø9.52) (MSZ-HM09/12NA) (with heat insulator) ø1/2 (ø12.7) (MSZ-HM15NA) 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 11: Service Functions

    SERVICE FUNCTIONS MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA MSZ-HM18NA MSZ-HM24NA 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 12 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 13: Microprocessor Control

    MICROPROCESSOR CONTROL MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA MSZ-HM18NA MSZ-HM24NA 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 14 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 15 (4) VANE AUTO ( ) mode In VANE AUTO mode, the microprocessor automatically determines the vane angle to make the optimum room tempera- ture distribution. MSZ-HM09/12/15NA In COOL and DRY operation In HEAT operation Vane angle is fixed to Horizontal position. Vane angle is fixed to Angle 5.
  • Page 16 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 17: Troubleshooting

    TROUBLESHOOTING MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA MSZ-HM18NA MSZ-HM24NA 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 18 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 19 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 20 9-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit operates. Indoor unit operates. Indoor unit does not OPERATION INDICATOR Outdoor unit does not Outdoor unit does not receive the signal from lamp on the indoor unit is operate. operate normally. remote controller. blinking ON and OFF.
  • Page 21 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 22 9-5. TROUBLESHOOTING CRITERION OF MAIN PARTS MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA MSZ-HM18NA MSZ-HM24NA 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 23 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 24 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 25 C Check of indoor P.C. board and indoor fan motor 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 Replace the indoor fan motor.
  • Page 26 D How to check miswiring and serial signal error MSZ-HM09/12/15NA 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 27 MSZ-HM18/24NA 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 28 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 29 9-7. Test point diagram and voltage MSZ-HM09NA - MSZ-HM12NA - MSZ-HM15NA - 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) approximately 4 Ω Fuse (F11)( * )
  • Page 30 MSZ-HM09NA - MSZ-HM12NA - MSZ-HM15NA - 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) approximately 4 Ω Fuse (F11)( * ) Indoor fan motor (CN211) (+)0-6 V...
  • Page 31 MSZ-HM18NA MSZ-HM24NA 1. 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) approximately 4 Ω motor (CN211) 294/325 V DC (+)0 or 15 V DC...

  • Page 32: Disassembly Instructions

    Locking lever lever. Connector 10-1. MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA : 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 33 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 34 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 35 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 36 10-2. MSZ-HM18NA MSZ-HM24NA 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 37 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the indoor power P.C. board and the Photo 2 electrical box (1) Remove the panel. (Refer to section 1.) Remove the Screws of right corner box. the ground plate Water cover (2) Disconnect the following connectors: <Indoor electronic control P.C.
  • Page 38 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. Indoor electronic (2) Disconnect the following connectors: control P.C. board <Indoor electronic control P.C.
  • Page 39 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 40 Do not pull the lead wire when removing the indoor coil thermistor. HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2015 MITSUBISHI ELECTRIC CORPORATION Issued: Feb. 2022. No. OBH746 REVISED EDITION-D Issued: Nov. 2021. No. OBH746 REVISED EDITION-C Issued: Mar.

This manual is also suitable for:

Msz-hm12naMsz-hm09naMsz-hm18naMsz-hm24na

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