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Mitsubishi Electric MSZ-BT35VG Service Manual
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Mitsubishi Electric MSZ-BT35VG Service Manual

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INDOOR UNIT
SERVICE MANUAL
Models
MSZ-BT20VG
MSZ-BT25VG
MSZ-BT35VG
MSZ-BT50VG
MSZ-BT25VG/VGK
MSZ-BT20VGK
E1
ER1
ET1
-
,
,
MSZ-BT25VGK
E1
ER1
ET1
-
,
,
MSZ-BT35VGK
E1
ER1
ET1
-
,
,
MSZ-BT50VGK
E1
ER1
ET1
-
,
,
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 ·············9
8. SERVICE FUNCTIONS ······························ 10
9. MICROPROCESSOR CONTROL ················ 13
10. TROUBLESHOOTING ······························· 17
11. DISASSEMBLY INSTRUCTIONS ················· 31
PARTS CATALOG (OBB849)
Revision C:
• 10. TROUBLESHOOTING has been modified.
OBH849 REVISED EDITION-B is void.
No. OBH849
REVISED EDITION-C
Outdoor unit service manual
MUZ-BT∙VG Series (OBH850)
MXZ-F∙VF Series (OBH890)
E1
ET1
-
,
E1
ET1
-
,
E1
ET1
-
,
E1
ET1
-
,

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Summary of Contents for Mitsubishi Electric MSZ-BT35VG

  • Page 1: Table Of Contents

    OBH849 REVISED EDITION-B is void. INDOOR UNIT No. OBH849 REVISED EDITION-C SERVICE MANUAL Models MSZ-BT20VG MSZ-BT20VGK MSZ-BT25VG MSZ-BT25VGK MSZ-BT35VG MSZ-BT35VGK MSZ-BT50VG MSZ-BT50VGK Outdoor unit service manual MUZ-BT∙VG Series (OBH850) MXZ-F∙VF Series (OBH890) CONTENTS 1. TECHNICAL CHANGES ······························2 2. PART NAMES AND FUNCTIONS ··················3 3.

  • Page 2: Technical Changes

    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. TECHNICAL CHANGES MSZ-BT20VG - MSZ-BT25VG - MSZ-BT35VG - MSZ-BT50VG - MSZ-BT20VGK - MSZ-BT25VGK - MSZ-BT35VGK - MSZ-BT50VGK - 1.

  • Page 3: Part Names And Functions

    Remote control receiving section Emergency operation switch ACCESSORIES MSZ-BT20VG MSZ-BT20VGK MSZ-BT25VG MSZ-BT25VGK Model MSZ-BT35VG MSZ-BT35VGK MSZ-BT50VG MSZ-BT50VGK Installation plate Installation plate fixing screw 4 × 25 mm Wireless remote controller Felt tape (For left or left-rear piping) Battery (AAA) for remote controller...

  • Page 4: Specification

    SPECIFICATION MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG Indoor model MSZ-BT20VGK MSZ-BT25VGK MSZ-BT35VGK MSZ-BT50VGK Single phase 230 V, 50 Hz Power supply Cooling Power input Heating Cooling 0.20 0.31 Running 0.25 0.35 current Heating Model RC0J30-CV Cooling 0.20 0.31 Current 0.25 0.35 Heating Dimensions W ×...

  • Page 5: Noise Criteria Curves

    NC-50 NC-40 NC-40 NC-30 NC-30 NC-20 NC-20 1000 2000 4000 8000 1000 2000 4000 8000 BAND CENTER FREQUENCIES,Hz BAND CENTER FREQUENCIES,Hz MSZ-BT35VG MSZ-BT50VG MSZ-BT35VGK MSZ-BT50VGK FUNCTION SPL(dB(A)) LINE FUNCTION SPL(dB(A)) LINE COOLING COOLING HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50...

  • Page 6: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG Unit: mm MSZ-BT20VGK MSZ-BT25VGK MSZ-BT35VGK MSZ-BT50VGK INSTALLATION PLATE 11×20 OBLONG HOLE 11×26 OBLONG HOLE 100.5 100.5 167.5 167.5 ø WALL HOLE 52.5 366.5 327.5 91.5 INDOOR UNIT 351.5 INSTALLATION PLATE AIR IN PIPING...

  • Page 7: Wiring Diagram

    WIRING DIAGRAM MSZ-BT20VG- MSZ-BT25VG- MSZ-BT35VG- MSZ-BT50VG- MSZ-BT20VG- MSZ-BT25VG- MSZ-BT35VG- MSZ-BT50VG- PARÇA ADI SİGORTA İÇ ÜNİTE TERMİNAL İÇ ÜNİTE ELEKTRONİK (T3.15AL250V) KARTI KONTROL KARTI FAN MOTORU KANAT MOTORU (YATAY) VARİSTÖR RESİSTÖR ODA SICAKLIK TERMİSTÖRÜ BORU SICAKLIK TERMİSTÖRÜ (ANA) BORU SICAKLIK TERMİSTÖRÜ...
  • Page 8 MSZ-BT20VGK- MSZ-BT25VGK- MSZ-BT35VGK- MSZ-BT50VGK- MSZ-BT20VGK- MSZ-BT25VGK- MSZ-BT35VGK- MSZ-BT50VGK- PARÇA ADI SİGORTA (T3.15AL250V) İÇ ÜNİTE TERMİNAL İÇ ÜNİTE ELEKTRONİK FAN MOTORU KONTROL KARTI KARTI KANAT MOTORU (YATAY) VARİSTÖR RESİSTÖR ODA SICAKLIK TERMİSTÖRÜ BORU SICAKLIK TERMİSTÖRÜ (ANA) BORU SICAKLIK TERMİSTÖRÜ (YARDIMCI) TERMİNAL BLOĞU RÖLE NOTLAR 1.

  • Page 9: Refrigerant System Diagram

    RT11 Flared connection Refrigerant pipe ø6.35 (with heat insulator) Refrigerant flow in cooling Refrigerant flow in heating MSZ-BT35VG MSZ-BT50VG MSZ-BT35VGK MSZ-BT50VGK Refrigerant pipe ø 9.52 (MSZ-BT35VG/VGK) ø12.7 (MSZ-BT50VG/VGK) (with heat insulator) Indoor coil Indoor thermistor heat RT12 exchanger Flared connection...

  • Page 10: Service Functions

    SERVICE FUNCTIONS MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG MSZ-BT20VGK MSZ-BT25VGK MSZ-BT35VGK MSZ-BT50VGK 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.) • The set time for the ON/OFF timer can be reduced to 1 second for each minute.
  • Page 11 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 12 Third party Wi-Fi interfaces cannot be connected to MELCloud. MODE switch It selects modes. Mitsubishi Electric is not responsible for any (i) under performance of a sys- tem or any product; (ii) system or product fault; or (iii) loss or damage to any RESET switch It resets the system and ALL settings.

  • Page 13: Microprocessor Control

    MICROPROCESSOR CONTROL MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG MSZ-BT20VGK MSZ-BT25VGK MSZ-BT35VGK MSZ-BT50VGK WIRELESS REMOTE CONTROLLER Signal transmitting section Distance of signal : About 6 m Beep(s) is (are) heard from the indoor unit when the signal is received. Operation display section Battery replacement...
  • Page 14 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 15 9-5. MULTI SYSTEM OPERATION FOR MULTI SYSTEM AIR CONDITIONER 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, one for the cooling and the others for heating, the operation mode of the indoor unit that operates first is selected.
  • Page 16 9-7. TIMER OPERATION (ON/OFF TIMER) 1. How to set the timer (1) Press during operation to set the timer. (ON timer) : The unit turns ON at the set time. (OFF timer) : The unit turns OFF at the set time. (3) Press (forward) and (backward) to set the time of timer.

  • Page 17: Troubleshooting

    TROUBLESHOOTING MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG MSZ-BT20VGK MSZ-BT25VGK MSZ-BT35VGK MSZ-BT50VGK 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 after confirm- ing the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.
  • Page 18 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. 1.
  • Page 19 2. Table of indoor unit failure mode recall function Left lamp of OPERA- Abnormal point TION INDICATOR Condition Remedy (Failure mode) lamp Not lit Normal — — The room temperature thermistor short or 1-time blink every Room tempera- Refer to the characteristics of the room temperature open circuit is detected every 8 seconds dur- 0.5-second ture thermistor...
  • Page 20 10-3. INSTRUCTION OF TROUBLESHOOTING *2 There is possibility that diesel explosion may occur due to the air mixied in the refrigerant circuit. 1. Check of the unit. *1. "Test Run operation" means the First, ensure that there are no leakage points on the valves, flare connec- tions, etc.
  • Page 21 2. Check of Wi-Fi interface (MSZ-BT·VGK) Follow the procedure below if the air conditioner cannot be monitored or controlled with a device such as a smartphone. Start There is a problem in communication between the air conditioner and Is the UNIT LED on the Wi-Fi interface blinking? the Wi-Fi interface.
  • Page 22 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 blinks. OPERATION INDICATOR Blinking Not lit...
  • Page 23 OPERATION INDICATOR Blinking Not lit Abnormal Operation indicator lamp Symptom Condition Remedy point Left lamp lights and right lamp blinks. The operation mode of the each indoor unit is MXZ type Outdoor unit differently set to COOL (includes DRY, FAN) •...
  • Page 24 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. NOTE: 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 25 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.) visible? (Not clear) Remove the batteries, then set them back...
  • Page 26 C Check of indoor P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN211 Measure the resistance of indoor fan and vane motor connector CN151 from the Short circuit: motor. Replace the indoor fan motor. Refer to 10-5.
  • Page 27 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. Was the indoor unit ever connected to the Multi (MXZ) series and operated (turned on)? The connection information to the Multi series is stored in the indoor unit.
  • Page 28 MXZ Type LED indication Turn OFF the power supply. for communication status Communication status is indicated by the LED. Unit status Is there rated voltage in Blinking: normal communication Check the power supply. the power supply? Lighting: abnormal communication or not connected Pattern 1 and 2 is repeatedly displayed Turn ON the power supply.
  • Page 29 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 30 10-7. TEST POINT DIAGRAM AND VOLTAGE 1. Indoor electronic control P.C. board, indoor terminal P.C. board and power monitor receiver SW P.C. board MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG MSZ-BT20VGK MSZ-BT25VGK MSZ-BT35VGK MSZ-BT50VGK Indoor electronic control P.C. board Connector to Indoor coil thermistor (CN112)

  • Page 31: Disassembly Instructions

    Locking lever lever. Connector 11-1. MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG NOTE: Turn OFF the power supply before disassembly. : Indicates the visible parts in the photos/figures. : Indicates the invisible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES 1.
  • Page 32 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the indoor terminal P.C. board, indoor Photo 2 Tab of the electronic control P.C. board, and power monitor Water cover earth wire receiver SW P.C. board and the electrical box Coil thermistor <Removing the electrical box> (1) Remove the panel.
  • Page 33 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the nozzle assembly and the vane Photo 5 motor <Removing the nozzle assembly> (1) Remove the panel (Refer to section 1.) and the corner box. (2) Remove the V.A. clamp, and then the indoor/outdoor connecting wire. (Refer to section 2.) (3) Remove the electrical cover.
  • Page 34 OPERATING PROCEDURE PHOTOS/FIGURES 4. 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 corner box. (2) Remove the electrical box and the nozzle assembly. (Refer to section 2,3.) (3) Remove the screws fixing the motor bed.
  • Page 35 11-2. MSZ-BT20VGK MSZ-BT25VGK MSZ-BT35VGK MSZ-BT50VGK NOTE: Turn OFF the power supply before disassembly. : Indicates the visible parts in the photos/figures. : Indicates the invisible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the panel Photo 1-1 (1) Remove the front panel. Wi-Fi interface (2) Remove the screw caps of the panel.
  • Page 36 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the Wi-Fi interface Earth wire connected Photo 2 to the indoor heat (1) Remove the panel (Refer to section 1.) and the corner exchanger box right. Electrical box (2) Remove the screw of the V.A. clamp. Remove the V.A.
  • Page 37 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the indoor terminal P.C. board, indoor Photo 4 electronic control P.C. board, and power monitor receiver SW P.C. board 2 hooks (1) Remove the panel (Refer to Section 1.) and the corner box right. (2) Remove the screw of the V.A. clamp. Remove the V.A. clamp and the indoor/outdoor connecting wire.
  • Page 38 OPERATING PROCEDURE PHOTOS/FIGURES 6. 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 corner box. (2) Remove the electrical box and the nozzle assembly. (Refer to section 2,3.) (3) Remove the screws fixing the motor bed.
  • Page 39 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 40 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2019 MITSUBISHI ELECTRIC CORPORATION Issued: Sep. 2020. No. OBH849 REVISED EDITION-C Issued: Feb. 2020. No. OBH849 REVISED EDITION-B Issued: Dec. 2019. No. OBH849 REVISED EDITION-A Published: Oct. 2019. No. OBH849 Made in Japan Specifications are subject to change without notice.

This manual is also suitable for:

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