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Mitsubishi Electric MSZ-HM09NA-U1 Service Manual

Indoor unit split-type air conditioners
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INDOOR UNIT
INDOOR UNIT

SERVICE MANUAL

Models
MSZ-HM09NA
MSZ-HM12NA
MSZ-HM15NA
MSZ-HM18NA
MSZ-HM24NA
MSZ-HM24NA
NOTE:
RoHS compliant products have mark on the spec name plate.
Revision B:
• 3-1. OPERATING RANGE has been modified.
Please void OBH746 REVISED EDITION-A.
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U1
-
U1
-
U1
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U1
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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 ··············· 9
7. SERVICE FUNCTIONS ··································· 10
8. MICROPROCESSOR CONTROL ··················· 12
9. TROUBLESHOOTING ····································· 16
10. DISASSEMBLY INSTRUCTIONS ···················· 30
PARTS CATALOG (OBB746)
No. OBH746
REVISED EDITION-B
·······································
2

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  Summary of Contents for Mitsubishi Electric MSZ-HM09NA-U1

  • Page 1: Table Of Contents

    Revision B: • 3-1. OPERATING RANGE has been modified. Please void OBH746 REVISED EDITION-A. INDOOR UNIT INDOOR UNIT No. OBH746 REVISED EDITION-B 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 ·······································...
  • Page 2: Technical Changes

    Use the speci ed 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 MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA Air lter Front panel Air cleaning lter (Anti-Allergy Enzyme Filter, option) Air inlet Heat exchanger Air outlet Horizontal vane Remote controller Display section Remote control receiving section Operation indicator lamp Emergency operation switch ACCESSORIES Installation plate Attachment screws for the installation plate...
  • Page 4 MSZ-HM18NA MSZ-HM24NA Air inlet Front panel Air lter Air cleaning lter Heat exchanger (Anti-Allergy Enzyme Filter, option) Air outlet Horizontal vane Remote controller Display section 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 Air ow (Wet) (364 - 286 - 201 - 134)
  • Page 6 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 Indoor Outdoor Standard temperature — Maximum temperature — Cooling Minimum temperature —...
  • Page 7: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA Unit: inch 2-1/4 11/16 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 Oblong hole...
  • Page 8: Wiring Diagram

    WIRING DIAGRAM MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA MSZ-HM18NA MSZ-HM24NA OBH746B...
  • Page 9: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA Unit: inch (mm) Refrigerant pipe ø3/8 (ø9.52) (MSZ-HM09/12NA) ø1/2 (ø12.7) (MSZ-HM15NA) (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...
  • Page 10: 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 11 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 12: 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 13 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 14 (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 15 8-6. EMERGENCY/TEST OPERATION In the case of test run operation or emergency operation, use 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 16: 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 17 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 18 2. Indoor unit failure mode table Upper lamp of OP- Abnormal point ERATION INDICA- Condition Remedy (Failure mode) TOR lamp Not lighted Normal — — The room temperature thermistor short or 1-time ash every Room temperature Refer to the characteristics of the room temperature open circuit is detected every 8 seconds dur- 0.5-second thermistor...
  • Page 19 9-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit operates. Indoor unit oper- Indoor unit does OPERATION INDICATOR Outdoor unit does ates. not receive the lamp on the indoor unit is not operate normally. Outdoor unit signal from re- ashing ON and OFF. mote controller.
  • Page 20 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 flashes. OPERATION INDICATOR Lighted Blinking...
  • Page 21 9-5. TROUBLE CRITERION OF MAIN PARTS MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA MSZ-HM18NA MSZ-HM24NA Part name Check method and criterion Figure Measure the resistance with a tester. Room temperature thermistor (RT11) Refer to 9-7. "Test point diagram and voltage", 1 or 2. "Indoor electronic Indoor coil thermistor control P.C.
  • Page 22: 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 EMERGENCY OPERATION switch.
  • Page 23 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 24 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 of indoor fan Short/ open circuit: motor connector CN151 from the indoor motor.
  • Page 25 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. Check the wiring. Is there rated voltage between outdoor terminal block S1 and S2? Press EMERGENCY OPERATION switch once.
  • Page 26 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. Check the wiring. Is there rated voltage between outdoor terminal block S1 and S2? Press EMERGENCY OPERATION switch once. Does the OPERATION INDICATOR lamp light up? <Con rmation of the power to the indoor unit>...
  • Page 27 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 28 9-7. Test point diagram and voltage MSZ-HM09/12/15NA 1. Indoor power P.C. board, Indoor terminal P.C. board Indoor terminal P.C. board Indoor power P.C. board Varistor (NR11) Resistor (R111) Fuse (F11)( ) Indoor fan motor (CN211) (+)0-6 V (+)3-6 VDC 15 VDC (–) GND (high- voltage DC) 294/325 VDC...
  • Page 29 MSZ-HM18NA MSZ-HM24NA 1. Indoor power P.C. board Connector to indoor electronic 12 VDC 5 VDC control P.C. board (CN20A) Connector to Terminal block (CN201) Fuse (F11) T3.15AL250V Varistor (NR11) Connector to Indoor fan motor (CN211) Resistor (R111) 294/325 VDC (+)0 or 15 VDC (-) GND (High (+)3-6 VDC voltage DC)
  • Page 30: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are 2 types (refer to (1) and (2)) 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 31 OPERATING PROCEDURE PHOTOS 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 1.) and the corner box. (2) Remove the screw of the V.A. clamp and the V.A. Screw of the clamp.
  • Page 32 OPERATING PROCEDURE PHOTOS 4. Removing the nozzle assembly Photo 5 (1) Remove the panel (Refer to 1.) and the corner box. (2) Remove the indoor/outdoor connecting wire (Refer to 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 33 OPERATING PROCEDURE PHOTOS 6. Removing the indoor fan motor, the indoor coil Photo 6 thermistor, and the line flow fan (1) Remove the panel (Refer to 1.) and the corner box. (2) Remove the indoor electronic control P.C. board hold- er, the electrical box and the nozzle assembly.
  • Page 34 10-2. MSZ-HM18NA MSZ-HM24NA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS Photo 1 1. Removing the panel (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 35 OPERATING PROCEDURE PHOTOS 2. Removing the indoor power P.C. board and the Photo 2 electrical box (1) Remove the panel. (Refer to 1.) Remove the right cor- Screws of ner box. the ground plate Water cover (2) Disconnect the following connectors: <Indoor electronic control P.C.
  • Page 36 OPERATING PROCEDURE PHOTOS 3. Removing the indoor electronic control P.C. Photo 5 board Control P.C. board holder (Inside) (1) Remove the panel. (Refer to 1.) Remove the right corner Catch box. Indoor electronic (2) Disconnect the following connectors: control P.C. board <Indoor electronic control P.C.
  • Page 37 OPERATING PROCEDURE PHOTOS 5. Removing the indoor fan motor, the indoor coil Photo 7 thermistor and the line flow fan (1) Remove the panel. (Refer to 1.) Remove the right cor- ner box. (2) Remove the control P.C. board holder, the water cover, the electrical box and the nozzle assembly.
  • Page 38 Do not pull the lead wire when removing the indoor coil thermistor. HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2015 MITSUBISHI ELECTRIC CORPORATION Distributed in Mar. 2016. No. OBH746 REVISED EDITION-B Distributed in Feb. 2016. No. OBH746 REVISED EDITION-A New publication, effective Mar.

This manual is also suitable for:

Msz-hm24na-u1Msz-hm12na-u1Msz-hm15na-u1Msz-hm18na-u1