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INDOOR UNIT
SERVICE MANUAL
Models
MSZ-BT20VG
MSZ-BT25VG
MSZ-BT35VG
MSZ-BT50VG
MSZ-BT25VG
https://me-p.ru
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Revision A:
• MSZ-BT20/25/35/50VG -
added.
OBH849 is void.
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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. 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 ················· 28
PARTS CATALOG (OBB849)
have been
ER1
No. OBH849
REVISED EDITION-A
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Table of Contents
Related Manuals for Mitsubishi Electric MUZ-BT VG Series
Summary of Contents for Mitsubishi Electric MUZ-BT VG Series
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Page 1: Table Of Contents
https://me-p.ru Revision A: • MSZ-BT20/25/35/50VG - have been added. OBH849 is void. INDOOR UNIT No. OBH849 REVISED EDITION-A SERVICE MANUAL Models MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG Outdoor unit service manual MUZ-BT∙VG Series (OBH850) MXZ-F∙VF Series (OBH890) CONTENTS 1. TECHNICAL CHANGES ······························2 2. -
Page 2: Technical Changes
https://me-p.ru Revision A: • MSZ-BT20/25/35/50VG - have been added. 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. -
Page 3: Part Names And Functions
https://me-p.ru PART NAMES AND FUNCTIONS MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG Front panel Air inlet Air fi lter (Air purifying fi lter) Air cleaning fi lter (Silver-ionized air purifi er fi lter, Horizontal vane option) Air outlet Heat exchanger Spec name plate Operation indicator lamp Remote control receiving Remote controller... -
Page 4: Specification
https://me-p.ru SPECIFICATION Indoor model MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG Power supply Single phase 230 V, 50 Hz Cooling Power input Heating Cooling 0.20 0.31 Running current Heating 0.25 0.35 Model RC0J30-CV Cooling 0.20 0.31 Current Heating 0.25 0.35 Dimensions W × H × D 838 ×... -
Page 5: Noise Criteria Curves
https://me-p.ru NOISE CRITERIA CURVES MSZ-BT20VG MSZ-BT25VG FUNCTION SPL(dB(A)) LINE FUNCTION SPL(dB(A)) 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 FUNCTION SPL(dB(A)) -
Page 6: Outlines And Dimensions
https://me-p.ru OUTLINES AND DIMENSIONS MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG Unit: mm 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 MIN 30mm DRAIN HOSE MIN 20mm 126.5 AIR OUT... -
Page 7: Wiring Diagram
https://me-p.ru WIRING DIAGRAM MSZ-BT20VG- MSZ-BT25VG- MSZ-BT35VG- MSZ-BT50VG- MSZ-BT20VG- MSZ-BT25VG- MSZ-BT35VG- MSZ-BT50VG- PARÇA ADI SİGORTA İÇ ÜNİTE TERMİNAL (T3.15AL250V) İÇ ÜNİTE ELEKTRONİK KARTI KONTROL KARTI FAN MOTORU KANAT MOTORU (YATAY) VARİSTÖR RESİSTÖR ODA SICAKLIK TERMİSTÖRÜ BORU SICAKLIK TERMİSTÖRÜ (ANA) BORU SICAKLIK TERMİSTÖRÜ... -
Page 8: Refrigerant System Diagram
https://me-p.ru REFRIGERANT SYSTEM DIAGRAM MSZ-BT20VG MSZ-BT25VG 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 Refrigerant flow in heating MSZ-BT35VG MSZ-BT50VG Refrigerant pipe ø... -
Page 9: Service Functions
https://me-p.ru SERVICE FUNCTIONS MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG 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 10 https://me-p.ru 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.
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Page 11: Microprocessor Control
https://me-p.ru MICROPROCESSOR CONTROL MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG 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 NIGHT MODE button OFF/ON... - Page 12 https://me-p.ru 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 https://me-p.ru 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 oth- ers for heating, the operation mode of the indoor unit that operates first is selected.
- Page 14 https://me-p.ru 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.
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Page 15: Troubleshooting
https://me-p.ru TROUBLESHOOTING MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG 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 16 https://me-p.ru 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 17 https://me-p.ru 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 18 https://me-p.ru 10-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit operates. Indoor unit does Indoor unit operates. OPERATION INDICATOR Outdoor unit does not receive the Outdoor unit does lamp on indoor unit is not operate normally. signal from re- not operate. blinking ON and OFF. mote controller.
- Page 19 https://me-p.ru 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 20 https://me-p.ru 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 21 https://me-p.ru 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 22 https://me-p.ru 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 23 https://me-p.ru 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 24 https://me-p.ru 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 25 https://me-p.ru 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 Check the power Blinking: normal communication the power supply? supply. Lighting: abnormal communication or not connected Pattern 1 and 2 is repeatedly displayed Turn ON the power supply.
- Page 26 https://me-p.ru 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 https://me-p.ru 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 Indoor electronic control P.C. board Connector to Indoor coil thermistor (CN112) RT12, RT13 Connector to Indoor Indoor terminal P.C.
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Page 28: Disassembly Instructions
https://me-p.ru 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 following 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 29 https://me-p.ru 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 30 https://me-p.ru 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.
- Page 31 https://me-p.ru 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 32 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: Dec. 2019. No. OBH849 REVISED EDITION-A Published: Oct. 2019. No. OBH849 Made in Japan Specifications are subject to change without notice.