Mitsubishi Electric MSZ-BT20VG-E3 Service Manual

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INDOOR UNIT

SERVICE MANUAL

Models

MSZ-BT20VG -

MSZ-BT25VG -

MSZ-BT35VG -

MSZ-BT50VG -

MSZ-BT25VG/VGK

ER1

ET1

ER2

ET2

ER3

ER1

ET1

ER2

ET2

ER3

ER1

ET1

ER2

ET2

ER3

ER1

ET1

ER2

ET2

ER3

Revision G:

• Manual number of "Outdoor service man-

ual MXZ-F∙VF Series" listed in the cover

has been revised.

OBH849 REVISED EDITION-F is void.

MSZ-BT20VGK -

ET3

MSZ-BT25VGK -

ET3

MSZ-BT35VGK -

ET3

MSZ-BT50VGK -

ET3

Outdoor unit service manual

MUZ-BT∙VG Series (OBH850)

MXZ-F∙VF Series (OBH790)

CONTENTS

1. TECHNICAL CHANGES ······························3

2. PART NAMES AND FUNCTIONS ··················4

3. SPECIFICATION ········································5

4. NOISE CRITERIA CURVES ··························6

5. OUTLINES AND DIMENSIONS ·····················7

6. WIRING DIAGRAM ·····································9

7. REFRIGERANT SYSTEM DIAGRAM ··········· 15

8. SERVICE FUNCTIONS ······························ 16

9. MICROPROCESSOR CONTROL ················· 18

10. TROUBLESHOOTING ······························· 22

11. DISASSEMBLY INSTRUCTIONS ················· 37

PARTS CATALOG (OBB849)

No. OBH849

REVISED EDITION-G

ET1

ET2

ER1

ER2

ET1

ET2

ER1

ER2

ET1

ET2

ER1

ER2

ET1

ET2

ER1

ER2

ET3

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Summary of Contents for Mitsubishi Electric MSZ-BT20VG-E3

Page 1: Table Of Contents
Revision G: • Manual number of “Outdoor service man- ual MXZ-F∙VF Series” listed in the cover has been revised. OBH849 REVISED EDITION-F is void. INDOOR UNIT No. OBH849 REVISED EDITION-G SERVICE MANUAL Models MSZ-BT20VG - MSZ-BT20VGK - MSZ-BT25VG - MSZ-BT25VGK - MSZ-BT35VG - MSZ-BT35VGK - MSZ-BT50VG -...
Page 2 Use the specified 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: Technical Changes
TECHNICAL CHANGES The following models are compatible with the outdoor units with low standby power control. Connecting the following models to the MUZ-BT·VG series outdoor units enables the low standby power control. The following models may be connected to the MUZ-BT·VG series after once connected to the MXZ series and operated, for example because of relocation.
Page 4: Part Names And Functions
PART NAMES AND FUNCTIONS MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG MSZ-BT20VGK MSZ-BT25VGK MSZ-BT35VGK MSZ-BT50VGK Air inlet Front panel Wi-Fi interface (Only for MSZ-BT VGK) • Air ﬁ lter (Air purifying ﬁ lter) Air cleaning ﬁ lter MSZ-BT•VG - E1 , ER1 , ET1 MSZ-BT•VGK - Horizontal vane E1 , ET1...
Page 5: 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 *1 Heating Model RC0J30-CV Cooling 0.20 0.31 Current *1 0.25 0.35 Heating Dimensions W ×...
Page 6: Noise Criteria Curves
NOISE CRITERIA CURVES MSZ-BT20VG MSZ-BT25VG MSZ-BT20VGK MSZ-BT25VGK FUNCTION SPL(dB(A)) FUNCTION SPL(dB(A)) LINE LINE COOLING COOLING 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 1000 2000 4000 8000 1000 2000 4000 8000 BAND CENTER FREQUENCIES,Hz BAND CENTER FREQUENCIES,Hz MSZ-BT35VG MSZ-BT50VG...
Page 7: Outlines And Dimensions
OUTLINES AND DIMENSIONS MSZ-BT20VG - MSZ-BT20VGK - Unit: mm MSZ-BT25VG - MSZ-BT25VGK - MSZ-BT35VG - MSZ-BT35VGK - MSZ-BT50VG - 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...
Page 8 MSZ-BT20VG - MSZ-BT20VGK - MSZ-BT25VG - MSZ-BT25VGK - MSZ-BT35VG - MSZ-BT35VGK - MSZ-BT50VG - MSZ-BT50VGK - MSZ-BT20/25/35VG MSZ-BT20/25/35VGK INSULATION ø37 O.D ø6.35 - 0.39m LIQUID LINE (FLARED CONNECTION ø6.35) ø9.52 - 0.34m GAS LINE (FLARED CONNECTION ø9.52) INSULATION ø29 DRAIN HOSE CONNECTED PART ø16 O.D MSZ-BT50VG MSZ-BT50VGK INSULATION ø37 O.D...
Page 9: Wiring Diagram
WIRING DIAGRAM MSZ-BT20VG- MSZ-BT25VG- MSZ-BT35VG- MSZ-BT50VG- MSZ-BT20VG- MSZ-BT25VG- MSZ-BT35VG- MSZ-BT50VG- OBH849G...
Page 10 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 (YARDIMCI) NOTLAR TERMİNAL BLOĞU 1.
Page 11 MSZ-BT20VG- MSZ-BT25VG- MSZ-BT35VG- MSZ-BT50VG- PARÇA ADI SİGORTA İÇ ÜNİTE ELEKTRONİK İÇ ÜNİTE (T3.15AL250V) TERMİNAL KARTI KONTROL KARTI FAN MOTORU KANAT MOTORU (YATAY) VARİSTÖR RESİSTÖR ODA SICAKLIK TERMİSTÖRÜ BORU SICAKLIK TERMİSTÖRÜ (ANA) BORU SICAKLIK TERMİSTÖRÜ (YARDIMCI) TERMİNAL BLOĞU RÖLE NOTLAR: 1. Dış ünite elektronik kablolaması için dış ünite elektronik kablo devre şemasını...
Page 12 MSZ-BT20VGK- MSZ-BT25VGK- MSZ-BT35VGK- MSZ-BT50VGK- MSZ-BT20VGK- MSZ-BT25VGK- MSZ-BT35VGK- MSZ-BT50VGK- OBH849G...
Page 13 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 1.
Page 14 MSZ-BT20VGK- MSZ-BT25VGK- MSZ-BT35VGK- MSZ-BT50VGK- PARÇA ADI SİGORTA (T3.15AL250V) İÇ ÜNİTE ELEKTRONİK İÇ ÜNİTE KONTROL KARTI TERMİNAL KARTI FAN MOTORU KANAT MOTORU (YATAY) VARİSTÖR RESİSTÖR ODA SICAKLIK TERMİSTÖRÜ BORU SICAKLIK TERMİSTÖRÜ (ANA) BORU SICAKLIK TERMİSTÖRÜ (YARDIMCI) TERMİNAL BLOĞU RÖLE NOTLAR: 1. Dış ünite elektronik kablolaması için dış ünite Wİ-Fİ...
Page 15: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MSZ-BT20VG MSZ-BT25VG Unit: mm MSZ-BT20VGK MSZ-BT25VGK 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 Refrigerant flow in heating MSZ-BT35VG...
Page 16: 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 17 • The MODE switch is used for selecting modes in conﬁgurations. Third party Wi-Fi interfaces cannot be connected to MELCloud. Mitsubishi Electric is not responsible for any (i) under (2) RESET switch performance of a system or any product; (ii) system or product •...
Page 18: 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 indicator FAN speed control button...
Page 19 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 20 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 21 9-7. TIMER OPERATION (ON/OFF TIMER) 1. How to set the timer during operation to set the timer. (1) Press (ON timer) : The unit turns ON at the set time. (OFF timer) : The unit turns OFF at the set time. (backward) to set the time of timer.
Page 22: 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 23 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 24 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 Refer to the characteristics of the room temperature Room tempera- open circuit is detected every 8 seconds dur- 0.5-second...
Page 25 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- operation within 30 minutes after tions, etc.
Page 26 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 27 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 28 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 29 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 The emergency operation switch.
Page 30 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 31 C Check of indoor P.C. board and indoor fan motor Turn OFF the power supply. Measure the resistance between Remove indoor fan motor connector CN211 of the indoor fan motor Short circuit: and vane motor connector CN151 from the CN211 Replace the indoor fan motor.
Page 32 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 33 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 34 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 35 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-BT20VGK - MSZ-BT25VG - MSZ-BT25VGK - MSZ-BT35VG - MSZ-BT35VGK - MSZ-BT50VG - MSZ-BT50VGK - Indoor electronic control P.C. board Connector to Connector to Indoor coil thermistor/ RT12, RT13...
Page 36 MSZ-BT20VG - MSZ-BT20VGK - MSZ-BT25VG - MSZ-BT25VGK - MSZ-BT35VG - MSZ-BT35VGK - MSZ-BT50VG - MSZ-BT50VGK - Indoor electronic control P.C. board Connector to Connector to Indoor coil thermistor/ RT12, RT13 vane motor Connector to Indoor Indoor terminal P.C. board (CN151) (CN112) Resistor (R111) fan motor (CN211)
Page 37: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS <Detaching method of the terminal with locking mechanism> The terminal which has the locking mechanism can be detached as shown below. There are 2 types 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 38 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 earth wire Water cover receiver SW P.C. board and the electrical box Coil thermistor <Removing the electrical box> (1) Remove the panel.
Page 39 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 40 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 41 11-2. MSZ-BT20VGK MSZ-BT25VGK MSZ-BT35VGK MSZ-BT50VGK NOTE: Turn OFF the power supply before disassembly. 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. Remove the Horizontal Front panel Screw of screws of the panel.
Page 42 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the indoor electrical box Photo 3-1 model) (1) Remove the panel (Refer to section 1.) and the corner box right. Upper catch of Screw of Electrical box (2) Remove the screw of the V.A. clamp. the terminal block the electrical box Remove the V.A.
Page 43 OPERATING PROCEDURE PHOTOS/FIGURES Photo 4 4. Removing the indoor terminal P.C. board, indoor 2 hooks electronic control P.C. board, and power monitor receiver SW P.C. board (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 44 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 45 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 46 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2019 MITSUBISHI ELECTRIC CORPORATION Issued: Dec. 2022. No. OBH849 REVISED EDITION-G Issued: Oct. 2022. No. OBH849 REVISED EDITION-F Issued: Nov. 2021. No. OBH849 REVISED EDITION-E Issued: Aug. 2021. No. OBH849 REVISED EDITION-D Issued: Sep.

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Mitsubishi Electric MSZ-BT20VG-E3 Service Manual

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