Mitsubishi Electric MSZ-HJ25VA Service Manual
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Mitsubishi Electric MSZ-HJ25VA Service Manual

Indoor unit
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INDOOR UNIT

SERVICE MANUAL

Models
MSZ-HJ25VA
MSZ-HJ35VA
MSZ-HJ50VA
MSZ-HJ60VA
MSZ-HJ71VA
MSZ-HJ25VA
MSZ-HJ35VA
MSZ-HJ50VA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
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CONTENTS
1. TECHNICAL CHANGES ······························3
2. PART NAMES AND FUNCTIONS ··················4
3. SPECIFICATION ········································5
4. NOISE CRITERIA CURVES ··························7
5. OUTLINES AND DIMENSIONS ·····················9
6. WIRING DIAGRAM ··································· 10
7. REFRIGERANT SYSTEM DIAGRAM ··········· 12
8. SERVICE FUNCTIONS ······························ 14
9. MICROPROCESSOR CONTROL ················ 16
10. TROUBLESHOOTING ······························· 20
11. DISASSEMBLY INSTRUCTIONS ················· 34
PARTS CATALOG (OBB647)
Revision D:
• MSZ-HJ25/35/50/60/71VA-
HJ25/35/50VA-
have been added.
ER2
Please void OBH647 REVISED EDITION-C.
No. OBH647
REVISED EDITION-D
Outdoor unit service manual
MUZ-HJ·VA Series (OBH648)
MXZ-HJ•VA Series (OBH709)
and MSZ-
E2

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Summary of Contents for Mitsubishi Electric MSZ-HJ25VA

  • Page 1: Indoor Unit

    MSZ- HJ25/35/50VA- have been added. Please void OBH647 REVISED EDITION-C. INDOOR UNIT No. OBH647 SERVICE MANUAL REVISED EDITION-D Models MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA MSZ-HJ60VA MSZ-HJ71VA Outdoor unit service manual MUZ-HJ·VA Series (OBH648) MXZ-HJ•VA Series (OBH709) CONTENTS 1. TECHNICAL CHANGES ······························3 2.
  • Page 2 When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to touch the live parts. Revision A: • MSZ-HJ50V A- has been added. Revision B: • MSZ-HJ25VA- , MSZ-HJ35VA- and MSZ-HJ50VA- have been added. Revision C: • MSZ-HJ60VA- and MSZ-HJ71VA- have been added.

  • Page 3: Technical Changes

    TECHNICAL CHANGES MSZ-HJ25VA - MSZ-HJ35VA - MSZ-HJ50VA - 1. New model MSZ-HJ60VA - MSZ-HJ71VA - 1. New model MSZ-HJ25VA - MSZ-HJ25VA - MSZ-HJ35VA - MSZ-HJ35VA - MSZ-HJ50VA - MSZ-HJ50VA - MSZ-HJ60VA - MSZ-HJ60VA - MSZ-HJ71VA - MSZ-HJ71VA - 1. Optional air cleaning filter has been added.

  • Page 4: Part Names And Functions

    PART NAMES AND FUNCTIONS MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA Front panel Air inlet Air lter Air cleaning lter (Silver-ionized air purifier filter, option) (HJ25/35/50VA- E2 , ER2 Horizontal vane Air outlet Emergency Heat exchanger operation switch Remote control Remote controller receiving section...
  • Page 5 SPECIFICATION Indoor model MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA Power supply Single phase 230 V, 50 Hz Breaker Capacity Cooling 1,040 2,050 Power input 1 (Total) Heating 1,480 Cooling Running current 1 (Total) Heating Cooling Power factor 1 (Total) Heating Starting current 1 (Total)
  • Page 6 Indoor model MSZ-HJ60VA MSZ-HJ71VA Power supply Single phase 230 V, 50 Hz Breaker Capacity Cooling 1,900 2,330 Power input 1 (Total) Heating 1,970 2,440 Cooling 10.3 Running current 1 (Total) Heating 10.8 Cooling Power factor 1 (Total) Heating Starting current 1 (Total) 10.8 Model RC0J30-MD...

  • Page 7: Table Of Contents

    NOISE CRITERIA CURVES MSZ-HJ25VA MSZ-HJ35VA FAN SPEED FUNCTION SPL(dB(A)) LINE FAN SPEED FUNCTION SPL(dB(A)) LINE COOLING COOLING Super High Super High HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 NC-20 NC-20 NC-10 NC-10 1000 2000 4000...

  • Page 8: Table Of Contents

    MSZ-HJ60VA MSZ-HJ71VA FAN SPEED FUNCTION SPL(dB(A)) LINE FAN SPEED FUNCTION SPL(dB(A)) LINE COOLING COOLING Super High Super High HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 NC-20 NC-20 NC-10 NC-10 1000 2000 4000 8000 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz...
  • Page 9 OUTLINES AND DIMENSIONS MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA Unit : mm 11×26 Oblong hole 11×20 Oblong hole Installation plate 80.5 80.5 Indoor unit 61.5 59.5 Wall hole Ø65 Air in Installation plate Piping Drain hose Air out MSZ-HJ25/35VA Insulation Ø35 O.D Liquid line Ø7 - 0.39m (Flared connection Ø6.35)

  • Page 10: Wiring Diagram

    WIRING DIAGRAM MSZ-HJ25VA - MSZ-HJ35VA - MSZ-HJ50VA - MSZ-HJ25VA - MSZ-HJ35VA - MSZ-HJ50VA - OBH647D...
  • Page 11 MSZ-HJ60VA - MSZ-HJ71VA - MSZ-HJ60VA - MSZ-HJ71VA - OBH647D...

  • Page 12: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MSZ-HJ25VA MSZ-HJ35VA Unit : mm Refrigerant pipe ø9.52 (with heat insulator) Indoor coil Indoor thermistor heat RT12 exchanger Flared connection Indoor coil thermistor RT13 Room temperature thermistor RT11 Flared connection Refrigerant pipe ø6.35 (with heat insulator) Refrigerant flow in cooling...
  • Page 13 MSZ-HJ60VA MSZ-HJ71VA Unit : mm Refrigerant pipe ø15.88 (with heat insulator) Indoor coil Indoor thermistor heat RT12 exchanger Flared connection Indoor coil thermistor RT13 Room temperature thermistor RT11 Flared connection Refrigerant pipe ø6.35 (MSZ-HJ60VA) ø9.52 (MSZ-HJ71VA) (with heat insulator) Refrigerant flow in cooling Refrigerant flow in heating OBH647D...

  • Page 14: Service Functions

    SERVICE FUNCTIONS MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA MSZ-HJ60VA MSZ-HJ71VA 8-1. 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. (Refer to 10-7.) Set time : 3-minute → 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is shortened by bridging the timer short mode point.)
  • Page 15 8-3. 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 16: Microprocessor Control

    MICROPROCESSOR CONTROL MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA MSZ-HJ60VA MSZ-HJ71VA WIRELESS REMOTE CONTROLLER MSZ-HJ25/35/50VA- Signal transmitting section Operation display section OPERATE/STOP (ON/OFF) button Fan speed control button Temperature buttons ECONO COOL button Vane control button Operation select button Timer mode select button Time set buttons...
  • Page 17 MSZ-HJ25/35/50VA- MSZ-HJ60/71VA- Signal transmitting section Operation display section STOP/OPERATE (OFF/ON) 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. Indoor unit receives the signal of the remote controller with beeps.
  • Page 18 9-3. HEAT ( ) OPERATION (1) Press OPERATE/STOP (ON/OFF) (HJ·VA- ) / STOP/OPERATE (OFF/ON) (HJ·VA- ) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select HEAT mode with OPERATION SELECT button. (3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature. The setting range is 16 ~ 31°C.
  • Page 19 (8) Cold air prevention in HEAT operation. The horizontal vane position is set to Upward. NOTE: When 2 or more indoor units are operated with multi outdoor unit, even if any indoor unit turns thermostat off, this control does not work in the indoor unit. (9) ECONO COOL ( ) operation (ECONOmical operation) When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher.

  • Page 20: Troubleshooting

    TROUBLESHOOTING MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA MSZ-HJ60VA MSZ-HJ71VA 10-1. 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 main unit first with the remote controller, and then after confirming the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.
  • Page 21 10-2. 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 (10-4.) 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 22 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 fl 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 23 10-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit operates. Indoor unit does Indoor unit oper- OPERATION INDICATOR Outdoor unit does not receive ates. lamp on the indoor unit is not operate normally. Outdoor unit the signal from fl ashing on and off. does not operate.
  • Page 24 10-4. 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 25 fi rst has manual. setting not operate. the priority. 10-5. TROUBLE CRITERION OF MAIN PARTS MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA MSZ-HJ60VA MSZ-HJ71VA Part name Check method and criterion Figure Measure the resistance with a tester. Room temperature thermistor (RT11) Refer to 10-7.

  • Page 26: Troubleshooting Flow

    10-6. TROUBLESHOOTING FLOW A Check of indoor fan motor 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 EMERGENCY OPERATION switch.
  • Page 27 B Check of remote controller and indoor electronic control P.C. board Check if the remote controller is exclusive for this air conditioner. Press OPERATE/STOP (ON/OFF) (HJ·VA- ) / STOP/OPERATE (OFF/ON) (HJ·VA- ) button on the remote controller. 1 Look at the image of the signal transmitting section of Is LCD display on the remote controller Replace the batteries.
  • Page 28 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 circuit: motor connector CN151 from the indoor motor.
  • Page 29 D How to check miswiring and serial signal error Turn OFF the power supply. MUZ-HJ type Is there rated voltage in the Check the power supply. power supply? MSZ-HJ25/35/50- 1. Turn ON the power supply. 2. Press the emergency operation switch. Has the relay 52C been turned on 3 minuets later ? [The relay will be turned on in 3 to 7 seconds by bridging the timer short mode point (Refer to 10-7.).]...
  • Page 30 MXZ type Turn ON the breaker. LED indication for communication status Communication status is indicated by the LED. Is there rated voltage Check the power supply Unit status between outdoor Blinking: normal communication and correct the problem. terminal block S1 and S2? Lighted: abnormal communication or not connected Not lighted: The outdoor P.C.
  • Page 31 E Electromagnetic noise enters into TV sets or radios Is the unit earthed? Earth the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 3 m, or is the the indoor unit, and/or the antennas and the distance between the antennas and the outdoor unit.
  • Page 32 10-7. TEST POINT DIAGRAM AND VOLTAGE MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA 1. Indoor power P.C. board Connector to Fuse (F11) Terminal block T3.15AL250V Varistor (NR11) Resistor (R111) (CN201) Connector to Indoor fan motor (CN211) (+)0 or 15 VDC (+)3-6 VDC 15 VDC...
  • Page 33 MSZ-HJ60VA MSZ-HJ71VA 1. Indoor power P.C. board 12 VDC 5 VDC Connector to indoor electronic Indoor terminal block Indoor terminal block control P.C. board (CN20A) connecting (TAB2) connecting (TAB1) Connector to Terminal block (CN201) Fuse (F11) T3.15AL250V Varistor (NR11) Connector to Indoor fan motor (CN211) Reactor (L111) 325 VDC...

  • Page 34: Disassembly Instructions

    Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 11-1. MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the panel Photo 1 Front panel (1) Remove the screw caps on the panel and remove the screws of the panel.
  • Page 35 OPERATING PROCEDURE PHOTOS 2. Removing the indoor power P.C. board and the Photo 2 Earth wire electrical box (1) Remove the panel. (Refer to 1.) Remove the right corner box. (2) Disconnect the following connectors: <Indoor electronic control P.C. board> Screw of the CN151 (Vane motor) electrical cover...
  • Page 36 OPERATING PROCEDURE PHOTOS 3. Removing the indoor electronic control P.C. Photo 4 board Control P.C. board holder (Inside) (1) Remove the panel. (Refer to 1.) Remove the right corner Catch box. (2) Disconnect the following connectors: Indoor electronic <Indoor electronic control P.C. board> control P.C.
  • Page 37 OPERATING PROCEDURE PHOTOS 5. Removing the indoor fan motor, the indoor coil Photo 6 thermistor and the line flow fan (1) Remove the panel. (Refer to 1.) Remove the corner box. (2) Remove the control P.C. board holder, the electrical box and the nozzle assembly.
  • Page 38 11-2. MSZ-HJ60VA MSZ-HJ71VA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS 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 39 OPERATING PROCEDURE PHOTOS 2. Removing the indoor power P.C. board and the Photo 2 electrical box Water cover (1) Remove the panel. (Refer to 1.) Remove the right cor- ner box. Screws of the earth plate (2) Disconnect the following connectors: Screw of the <Indoor electronic control P.C.
  • Page 40 OPERATING PROCEDURE PHOTOS 3. Removing the indoor electronic control P.C. Photo 4 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 41 OPERATING PROCEDURE PHOTOS 5. Removing the indoor fan motor, the indoor coil Photo 6 thermistor and the line flow fan (1) Remove the panel. (Refer to 1.) Remove the corner box. (2) Remove the control P.C. board holder, the water cover, the electrical box and the nozzle assembly.
  • Page 42 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 44 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2012 MITSUBISHI ELECTRIC CORPORATION Distributed in Dec. 2015. No. OBH647 REVISED EDITION-D Distributed in Oct. 2014. No. OBH647 REVISED EDITION-C Distributed in Dec. 2013. No. OBH647 REVISED EDITION-B Distributed in Mar.

This manual is also suitable for:

Msz-hj50vaMsz-hj60vaMsz-hj35vaMsz-hj71va

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