Mitsubishi Electric MSZ-DW25VF Service Manual
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Mitsubishi Electric MSZ-DW25VF Service Manual

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INDOOR UNIT
SERVICE MANUAL
Models
MSZ-DW25VF
MSZ-DW35VF
MSZ-DW50VF
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ER1
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CONTENTS
1. TECHNICAL CHANGES ······························2
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································4
4. NOISE CRITERIA CURVES ··························5
5. OUTLINES AND DIMENSIONS ·····················6
6. WIRING DIAGRAM ·····································7
7. REFRIGERANT SYSTEM DIAGRAM ·············8
8. SERVICE FUNCTIONS ································9
9. MICROPROCESSOR CONTROL ················ 11
10. TROUBLESHOOTING ······························· 15
11. DISASSEMBLY INSTRUCTIONS ················· 27
PARTS CATALOG (OBB905)
No. OBH905
Outdoor unit service manual
MUZ-DW·VF Series (OBH906)
MXZ-HA∙VF Series (OBH828)

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Summary of Contents for Mitsubishi Electric MSZ-DW25VF

  • Page 1: Table Of Contents

    INDOOR UNIT No. OBH905 SERVICE MANUAL Models MSZ-DW25VF MSZ-DW35VF MSZ-DW50VF Outdoor unit service manual MUZ-DW·VF Series (OBH906) MXZ-HA∙VF Series (OBH828) CONTENTS 1. TECHNICAL CHANGES ······························2 2. PART NAMES AND FUNCTIONS ··················3 3. SPECIFICATION ········································4 4. NOISE CRITERIA CURVES ··························5 5. OUTLINES AND DIMENSIONS ·····················6 6.

  • Page 2: Technical Changes

    The compressor may burst if air etc. get into it. • When opening or closing the valve below freezing temperatures, refrigerant may spurt out from the gap between the valve stem and the valve body, resulting in injuries. TECHNICAL CHANGES MSZ-DW25VF - MSZ-DW35VF - MSZ-DW50VF - 1. New model...

  • Page 3: Part Names And Functions

    PART NAMES AND FUNCTIONS MSZ-DW25VF MSZ-DW35VF MSZ-DW50VF Front panel Air inlet Air filter (Air purifying filter) Air cleaning filter (V Blocking Filter, option) Horizontal vane Air outlet Fan guard Heat exchanger Display section Remote control Remote controller receiving section Operation indicator lamp...

  • Page 4: Specification

    SPECIFICATION MSZ-DW25VF MSZ-DW35VF MSZ-DW50VF Indoor model Power supply Single phase 230 V, 50 Hz Cooling Power input Heating Cooling 0.22 0.28 0.29 Running 0.24 current *1 Heating 0.25 0.29 Model RC0J30-CV Cooling 0.22 0.28 0.29 Current *1 0.24 Heating 0.25 0.29...

  • Page 5: Noise Criteria Curves

    NOISE CRITERIA CURVES MSZ-DW25VF MSZ-DW35VF 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 6: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MSZ-DW25VF MSZ-DW35VF MSZ-DW50VF 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-DW25/35/50VF Insulation Ø37 O.D Liquid line Ø7.0 - 0.39m (Flared connection Ø6.35)

  • Page 7: Wiring Diagram

    WIRING DIAGRAM MSZ-DW25VF - MSZ-DW35VF - MSZ-DW50VF - MSZ-DW25VF - MSZ-DW35VF - MSZ-DW50VF - PARÇA ADI SİGORTA (T3.15AL250V) FAN MOTORU KANAT MOTORU (YATAY) DIŞ ÜNİTEYE VARİSTÖR İÇ ÜNİTE RESİSTÖR KARTI ODA SICAKLIK TERMİSTÖRÜ BORU SICAKLIK TERMİSTÖRÜ (ANA) BORU SICAKLIK TERMİSTÖRÜ...

  • Page 8: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MSZ-DW25VF MSZ-DW35VF MSZ-DW50VF 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 9: Service Functions

    SERVICE FUNCTIONS MSZ-DW25VF MSZ-DW35VF MSZ-DW50VF 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 10 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 11: Microprocessor Control

    MICROPROCESSOR CONTROL MSZ-DW25VF MSZ-DW35VF MSZ-DW50VF 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 9-1. 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 (TOO WARM or TOO COOL button) to select the desired temperature. The setting range is 16 ~ 31°C.
  • Page 13 OPERATION INDICATOR Blinking Not lit • When indoor unit starts the operation while the defrosting of outdoor unit is being done, it takes a few minutes (max. 10 minutes) to blow out the warm air. • In the heating operation, though indoor unit is not operating, it may get warm or the sound of refrigerant flow may be heard.
  • Page 14 9-7. TIMER OPERATION (ON/OFF TIMER) 1. How to set the timer (1) Press OFF/ON (stop/operate) button to start the air conditioner. (2) Select the timer mode by pressing the button during operation. Each time this button is pressed, the timer mode is changed in sequence: (OFF TIMER) →...

  • Page 15: Troubleshooting

    TROUBLESHOOTING MSZ-DW25VF MSZ-DW35VF MSZ-DW50VF 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 16 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 17 NOTE : Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-4.). 2. Table of indoor unit failure mode recall function Upper lamp of OP- Abnormal point ERATION INDICA- Condition Remedy (Failure mode) TOR lamp Not lit Normal —...
  • Page 18 10-3. INSTRUCTION OF TROUBLESHOOTING *2 There is possibility that diesel explosion may occur due to the air mixed in the refrigerant circuit. First, ensure that there are no leakage points on the valves, flare connections, etc. that allow the air to flow into the refrigerant circuit, or no blockage points (e.g. clogged or closed valves) in the refrigerant circuit that cause an increase in pressure.
  • Page 19 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. MSZ-DW25VF MSZ-DW35VF MSZ-DW50VF OPERATION INDICATOR Blinking...
  • Page 20 10-5. TROUBLESHOOTING CRITERION OF MAIN PARTS MSZ-DW25VF MSZ-DW35VF MSZ-DW50VF Part name Check method and criterion Figure Measure the resistance with a multimeter. Room temperature thermistor (RT11) Refer to 10-7.
  • Page 21 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 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 OFF/ON (stop/operate) button on the remote controller. Is LCD display on the remote controller Replace the batteries. (Refer to 10-1.4.) 1 Look at the image of the signal transmitting section of visible? the remote controller through the monitor of a digital...
  • Page 23 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 24 D How to check miswiring and serial signal error MUZ Type Turn the power supply OFF. Is there rated voltage in the power supply? Check the power supply. Check for incorrect indoor-outdoor connecting wiring. • Turn OFF inverter-controlled lighting equipment. •...
  • Page 25 MXZ Type Turn OFF the power supply. LED indication for communication status Communication status is indicated Is there rated voltage in by the LED. Check the power the power supply? supply. Unit status Blinking: normal communication Lighting: abnormal communication or not connected Turn ON the power supply.
  • Page 26 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 27 10-7. TEST POINT DIAGRAM AND VOLTAGE MSZ-DW25VF MSZ-DW35VF MSZ-DW50VF 1. Indoor power P.C. board Connector to indoor electronic control P.C. board (CN20A) 12 VDC 5 VDC Connector to Terminal block (CN201) Fuse (F11) T3.15AL250V Connector to Indoor fan motor (CN211)

  • Page 28: Disassembly Instructions

    Locking lever lever. Connector 11-1. MSZ-DW25VF MSZ-DW35VF MSZ-DW50VF : Indicates the visible parts in the photos/figures. NOTE: Turn OFF the power supply before disassembly. : Indicates the invisible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES 1.
  • Page 29 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the indoor power P.C. board and the Photo 2 Earth wire electrical box (1) Remove the panel. (Refer to section 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 30 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the indoor electronic control P.C. Photo 4 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 31 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the indoor fan motor, the indoor coil Photo 6 thermistor and the line flow fan (1) Remove the panel. (Refer to section 1.) Remove the corner box. (2) Remove the control P.C. board holder, the electrical box and the nozzle assembly.
  • Page 32 Mount the clip-shape part on the marked position. 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 2021 MITSUBISHI ELECTRIC CORPORATION Published: Oct. 2021. No. OBH905 Made in Japan...

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