Mitsubishi Electric MSZ-BT20VG-E1 Service Manual

Hide thumbs Also See for MSZ-BT20VG-E1:

Service manual (32 pages)

Service manual (40 pages)

Service manual (46 pages)

page of 42

/ 42
Bookmarks

Quick Links

Download this manual

INDOOR UNIT

SERVICE MANUAL

Models

MSZ-BT20VG

MSZ-BT25VG

MSZ-BT35VG

MSZ-BT50VG

MSZ-BT25VG/VGK

ER1

ET1

ER2

ET2

ER1

ET1

ER2

ET2

ER1

ET1

ER2

ET2

ER1

ET1

ER2

ET2

Revision E:

• MSZ-BT20/25/35/50VGK -

added.

OBH849 REVISED EDITION-D is void.

MSZ-BT20VGK

MSZ-BT25VGK

MSZ-BT35VGK

MSZ-BT50VGK

Outdoor unit service manual

MUZ-BT∙VG Series (OBH850)

MXZ-F∙VF Series (OBH890)

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 ·····································8

7. REFRIGERANT SYSTEM DIAGRAM ··········· 12

8. SERVICE FUNCTIONS ······························ 13

9. MICROPROCESSOR CONTROL ················· 16

10. TROUBLESHOOTING ······························· 20

11. DISASSEMBLY INSTRUCTIONS ················· 34

PARTS CATALOG (OBB849)

have been

ER1

No. OBH849

REVISED EDITION-E

ET1

ET2

ER1

ET1

ET2

ER1

ET1

ET2

ER1

ET1

ET2

ER1

Need help?

Do you have a question about the MSZ-BT20VG-E1 and is the answer not in the manual?

Questions and answers

Summary of Contents for Mitsubishi Electric MSZ-BT20VG-E1

Page 1 Revision E: • MSZ-BT20/25/35/50VGK - have been added. OBH849 REVISED EDITION-D is void. INDOOR UNIT No. OBH849 REVISED EDITION-E 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.
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. 1.
Page 22 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 23 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 24 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 25 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 26 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 27 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 28 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 29 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 Short circuit: and vane motor connector CN151 from the motor. Replace the indoor fan motor. indoor electronic control P.C.
Page 30 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 31 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 32 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 33 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/ RT12, RT13/ (CN112) Connector to Indoor Connector to...
Page 34 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 35 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 36 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 37 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 38 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 39 OPERATING PROCEDURE PHOTOS/FIGURES Earth wire connected 2. Removing the Wi-Fi interface 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 40 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 41 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 42 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 2019 MITSUBISHI ELECTRIC CORPORATION Issued: Nov. 2021. No. OBH849 REVISED EDITION-E Issued: Aug. 2021. No. OBH849 REVISED EDITION-D Issued: Sep.

This manual is also suitable for:

Msz-bt20vg-er1 Msz-bt20vg-et1 Msz-bt20vg-e2 Msz-bt20vg-er2 Msz-bt20vg-et2 Msz-bt25vg-e1 ... Show all