Mitsubishi Electric MSZ-BT20VG-E3 User manual

INDOOR UNIT
Outdoor unit service manual
MUZ-BT∙VG Series (OBH850)
MXZ-F∙VF Series (OBH790)
PARTS CATALOG (OBB849)
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
SERVICE MANUAL
MSZ-BT25VG/VGK
OBH849 REVISED EDITION-F is void.
Revision G:
• Manual number of “Outdoor service man-
ual MXZ-F∙VF Series” listed in the cover
has been revised.
No. OBH849
REVISED EDITION-G
Models
MSZ-BT20VG - E1 , ER1, ET1 , E2 , ER2, ET2 , E3 , ER3, ET3 MSZ-BT20VGK - E1 , ET1 , E2 , ET2 , ER1, E3 , ER2, ET3
MSZ-BT25VG - E1 , ER1, ET1 , E2 , ER2, ET2 , E3 , ER3, ET3 MSZ-BT25VGK - E1 , ET1 , E2 , ET2 , ER1, E3 , ER2, ET3
MSZ-BT35VG - E1 , ER1, ET1 , E2 , ER2, ET2 , E3 , ER3, ET3 MSZ-BT35VGK - E1 , ET1 , E2 , ET2 , ER1, E3 , ER2, ET3
MSZ-BT50VG - E1 , ER1, ET1 , E2 , ER2, ET2 , E3 , ER3, ET3 MSZ-BT50VGK - E1 , ET1 , E2 , ET2 , ER1, E3 , ER2, ET3

2
Revision A:
• MSZ-BT20/25/35/50VG - ER1 have been added.
Revision B:
• MSZ-BT20/25/35/50VGK - E1 , ET1 have been added.
Revision C:
• 10. TROUBLESHOOTING has been modified.
Use the specied 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.
<Preparation before the repair service>
Prepare the proper tools.
Prepare the proper protectors.
Provide adequate ventilation.
After stopping the operation of the air conditioner, turn off the power-supply breaker and pull the power plug.
Discharge the capacitor before the work involving the electric parts.
<Precautions during the repair service>
Do not perform the work involving the electric parts with wet hands.
Do not pour water into the electric parts.
Do not touch the refrigerant.
Do not touch the hot or cold areas in the refrigeration cycle.
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.
WARNING
• When the refrigeration circuit has a leak, do not execute pump down with the compressor.
• When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.
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.
Revision D:
• MSZ-BT20/25/35/50VG - E2 , ER2 , ET2 and MSZ-BT20/25/35/50VGK - E2 , ET2 have been added.
Revision E:
• MSZ-BT20/25/35/50VGK - ER1 have been added.
Revision F:
• MSZ-BT20/25/35/50VG - E3 , ER3 , ET3 and MSZ-BT20/25/35/50VGK - E3 , ER2 , ET3 have been added.
Revision G:
• Manual number of “Outdoor service manual MXZ-F∙VF Series” listed in the cover has been revised.
OBH849G

3
TECHNICAL CHANGES1
MSZ-BT20VG - E1 , ER1 , ET1
MSZ-BT25VG - E1 , ER1 , ET1
MSZ-BT35VG - E1 , ER1 , ET1
MSZ-BT50VG - E1 , ER1 , ET1
MSZ-BT20VGK - E1 , ET1
MSZ-BT25VGK - E1 , ET1
MSZ-BT35VGK - E1 , ET1
MSZ-BT50VGK - E1 , ET1
1. New model
MSZ-BT20VG - E1 , ER1 , ET1 MSZ-BT20VG - E2 , ER2 , ET2
MSZ-BT25VG - E1 , ER1 , ET1 MSZ-BT25VG - E2 , ER2 , ET2
MSZ-BT35VG - E1 , ER1 , ET1 MSZ-BT35VG - E2 , ER2 , ET2
MSZ-BT50VG - E1 , ER1 , ET1 MSZ-BT50VG - E2 , ER2 , ET2
MSZ-BT20VGK - E1 , ET1 MSZ-BT20VGK - E2 , ET2
MSZ-BT25VGK - E1 , ET1 MSZ-BT25VGK - E2 , ET2
MSZ-BT35VGK - E1 , ET1 MSZ-BT35VGK - E2 , ET2
MSZ-BT50VGK - E1 , ET1 MSZ-BT50VGK - E2 , ET2
1. Indoor electronic control P.C. board has been changed.
2. Air cleaning filter has been changed.
MSZ-BT20VGK - ER1
MSZ-BT25VGK - ER1
MSZ-BT35VGK - ER1
MSZ-BT50VGK - ER1
1. New model
MSZ-BT20VG - E2 , ET2 MSZ-BT20VG - E3 , ET3
MSZ-BT25VG - E2 , ET2 MSZ-BT25VG - E3 , ET3
MSZ-BT35VG - E2 , ET2 MSZ-BT35VG - E3 , ET3
MSZ-BT50VG - E2 , ET2 MSZ-BT50VG - E3 , ET3
1. Fire mark has been changed.
2. Installation plate has been changed.
3. Indoor electronic control P.C. board has been changed.
MSZ-BT20VGK - E2 , ER1 , ET2 MSZ-BT20VGK - E3 , ER2 , ET3
MSZ-BT25VGK - E2 , ER1 , ET2 MSZ-BT25VGK - E3 , ER2 , ET3
MSZ-BT35VGK - E2 , ER1 , ET2 MSZ-BT35VGK - E3 , ER2 , ET3
MSZ-BT50VGK - E2 , ER1 , ET2 MSZ-BT50VGK - E3 , ER2 , ET3
1. Fire mark has been changed.
2. Installation plate has been changed.
3. Indoor electronic control P.C. board has been changed.
4. Wi-Fi interface has been changed.
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. In that case, the MUZ-BT·VG series outdoor units will not operate without taking a step.
Follow the procedure “Deleting the memorized abnormal condition” described in 10-2.1.
OBH849G

4
PART NAMES AND FUNCTIONS2
Operation indicator lamp
Remote control receiving
section
Emergency operation switch
Spec name plate
Horizontal vane
Air inlet
Air filter
(Air purifying filter)
Air cleaning filter
Front panel
Air outlet
Heat exchanger
Wi-Fi interface
(Only for MSZ-BT•
VGK)
Fan guard
(Silver-ionized air puri
fier filter, option)
MSZ-BT
•VG - E1 , ER1 , ET1
MSZ-BT
•VGK -
E1 , ET1
(V Blocking Filter)
MSZ-BT
•VG - E2 , ER2 , ET2 , E3 , ER3 , ET3
MSZ-BT
•VGK -
E2 , ET2 , ER1 , E3 , ER2 , ET3
MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG
MSZ-BT20VGK MSZ-BT25VGK MSZ-BT35VGK MSZ-BT50VGK
ACCESSORIES
Model
MSZ-BT20VG - E1 , ER1 , ET1
MSZ-BT25VG - E1 , ER1 , ET1
MSZ-BT35VG - E1 , ER1 , ET1
MSZ-BT50VG - E1 , ER1 , ET1
MSZ-BT20VGK - E1 , ET1
MSZ-BT25VGK - E1 , ET1
MSZ-BT35VGK - E1 , ET1
MSZ-BT50VGK - E1 , ET1
MSZ-BT20VG - E2 , ER2 , ET2 , E3 , ER3 , ET3
MSZ-BT25VG - E2 , ER2 , ET2 , E3 , ER3 , ET3
MSZ-BT35VG - E2 , ER2 , ET2 , E3 , ER3 , ET3
MSZ-BT50VG - E2 , ER2 , ET2 , E3 , ER3 , ET3
MSZ-BT20VGK - E2 , ET2 , ER1 , E3 , ER2 , ET3
MSZ-BT25VGK - E2 , ET2 , ER1 , E3 , ER2 , ET3
MSZ-BT35VGK - E2 , ET2 , ER1 , E3 , ER2 , ET3
MSZ-BT50VGK - E2 , ET2 , ER1 , E3 , ER2 , ET3
(1) Installation plate 1 1
(2) Installation plate xing screw 4 × 25 mm 5 5
(3) Wireless remote controller 1 1
(4) Felt tape (For left or left-rear piping) 1 1
(5) Battery (AAA) for remote controller 2 2
(6) Air Cleaning Filter (V Blocking Filter) - 2
Remote controller
OBH849G

5
SPECIFICATION3
Indoor model MSZ-BT20VG
MSZ-BT20VGK
MSZ-BT25VG
MSZ-BT25VGK
MSZ-BT35VG
MSZ-BT35VGK
MSZ-BT50VG
MSZ-BT50VGK
Power supply Single phase 230 V, 50 Hz
Electrical data
Power input
*1 Cooling W19 31
Heating 24 37
Running
current *1 Cooling A0.20 0.31
Heating 0.25 0.35
Fan motor
Model RC0J30-CV
Current *1 Cooling A0.20 0.31
Heating 0.25 0.35
Dimensions W × H × D mm 838 × 280 × 235
Weight kg 9.0
Special remarks
Air direction 5
Airow
Cooling
Super High
m3/h
654 792
High 522 660
Med. 408 540
Low 312 456
Super Low 252 378
Heating
Super High 714 846
High 540 714
Med. 408 594
Low 300 468
Super Low 252 360
Sound level
Cooling
Super High
dB(A)
43 46
High 37 38 40
Med. 30 31 36
Low 22 33
Super Low 19 29
Heating
Super High 43 44 48
High 37 43
Med. 30 38
Low 23 33
Super Low 20 29
Fan speed
Cooling
Super High
rpm
990 1,150
High 840 1,000
Med. 700 860
Low 580 760
Super Low 500 660
Heating
Super High 1,060 1,210
High 860 1,060
Med. 700 920
Low 560 770
Super Low 500 640
Fan speed regulator 5
Remote controller model ZH19A
NOTE: Test conditions are based on ISO 5151.
Cooling: Indoor Dry-bulb temperature 27°C Wet-bulb temperature 19°C
Outdoor Dry-bulb temperature 35°C
Heating: Indoor Dry-bulb temperature 20°C
Outdoor Dry-bulb temperature 7°C Wet-bulb temperature 6°C
*1 Measured under rated operating frequency.
Specifications and rated conditions of main electric parts
Model MSZ-BT20/25/35/50VG
MSZ-BT20/25/35/50VGK
Fuse (F11) T3.15AL250V
Horizontal vane motor (MV) 12 V DC
Varistor
(NR11) 470 V
Terminal block (TB) 3P
OBH849G

6
NOISE CRITERIA CURVES4
MSZ-BT25VG
MSZ-BT25VGK
MSZ-BT35VG
MSZ-BT35VGK
MSZ-BT50VG
MSZ-BT50VGK
10
20
30
40
50
60
70
80
90
63 125 250 500 1000 2000 4000 8000
OCTAVE BAND SOUND PRESSURE LEVEL,dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES,Hz
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
COOLING
FUNCTION SPL(dB(A)) LINE
46
HEATING 44
10
20
30
40
50
60
70
80
90
63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL,dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES,Hz
COOLING
FUNCTION SPL(dB(A)) LINE
46
HEATING 48
10
20
30
40
50
60
70
80
90
63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL,dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES,Hz
COOLING
FUNCTION SPL(dB(A)) LINE
43
HEATING 43
Test conditions
Cooling: Dry-bulb temperature 27°C
Wet-bulb temperature 19°C
Heating: Dry-bulb temperature 20°C
INDOOR UNIT WALL
MICROPHONE
0.8m
1m
MSZ-BT20VG
MSZ-BT20VGK
10
20
30
40
50
60
70
80
90
63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL,dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES,Hz
COOLING
FUNCTION SPL(dB(A)) LINE
43
HEATING 43
OBH849G

7
OUTLINES AND DIMENSIONS5
Unit: mm
100.5
242.5
225 225
199.537.5
100.5
52.5
167.5 167.5
366.5 327.5 91.5
3
37.5 199.5
219.5
242.5
23.5
46 18.5
167
838
235 5
280
50
(5) 351.5
66.5 2.5
64
43
57
42
57
164
100
12.5
126.5
98
40
57
677.5 111(49.5)
MIN 37mm
IN CASE OF LEFT, LEFT REAR,OR LEFT UNDER PIPING (USING SPACER), MIN 125mm
MIN 20mm
MIN 7mm
MIN 30mm
INSTALLATION PLATE 11×20 OBLONG HOLE
11×26 OBLONG HOLE
INDOOR UNIT
WALL HOLE
ø 65
AIR OUT
AIR IN INSTALLATION PLATE
PIPING
DRAIN HOSE
MSZ-BT20/25/35VG MSZ-BT20/25/35VGK
PIPING
INSULATION ø37 O.D
LIQUID LINE ø6.35 - 0.39m
(FLARED CONNECTION ø6.35)
GAS LINE ø9.52 - 0.34m
(FLARED CONNECTION ø9.52)
DRAIN HOSE INSULATION ø29
CONNECTED PART ø16 O.D
MSZ-BT50VG MSZ-BT50VGK
PIPING
INSULATION ø37 O.D
LIQUID LINE ø6.35 - 0.39m
(FLARED CONNECTION ø6.35)
GAS LINE ø9.52 - 0.34m
(FLARED CONNECTION ø12.7)
DRAIN HOSE INSULATION ø29
CONNECTED PART ø16 O.D
MSZ-BT20VG - E1 , ER1 , ET1 , E2 , ER2 , ET2 MSZ-BT20VGK - E1 , ET1 , E2 , ET2 , ER1
MSZ-BT25VG - E1 , ER1 , ET1 , E2 , ER2 , ET2 MSZ-BT25VGK - E1 , ET1 , E2 , ET2 , ER1
MSZ-BT35VG - E1 , ER1 , ET1 , E2 , ER2 , ET2 MSZ-BT35VGK - E1 , ET1 , E2 , ET2 , ER1
MSZ-BT50VG - E1 , ER1 , ET1 , E2 , ER2 , ET2 MSZ-BT50VGK - E1 , ET1 , E2 , ET2 , ER1
OBH849G

8
MSZ-BT20VG - E3 , ER3 , ET3 MSZ-BT20VGK - E3 , ER2 , ET3
MSZ-BT25VG - E3 , ER3 , ET3 MSZ-BT25VGK - E3 , ER2 , ET3
MSZ-BT35VG - E3 , ER3 , ET3 MSZ-BT35VGK - E3 , ER2 , ET3
MSZ-BT50VG - E3 , ER3 , ET3 MSZ-BT50VGK - E3 , ER2 , ET3
MSZ-BT20/25/35VG MSZ-BT20/25/35VGK
PIPING
INSULATION ø37 O.D
LIQUID LINE ø6.35 - 0.39m
(FLARED CONNECTION ø6.35)
GAS LINE ø9.52 - 0.34m
(FLARED CONNECTION ø9.52)
DRAIN HOSE INSULATION ø29
CONNECTED PART ø16 O.D
MSZ-BT50VG MSZ-BT50VGK
PIPING
INSULATION ø37 O.D
LIQUID LINE ø6.35 - 0.39m
(FLARED CONNECTION ø6.35)
GAS LINE ø9.52 - 0.34m
(FLARED CONNECTION ø12.7)
DRAIN HOSE INSULATION ø29
CONNECTED PART ø16 O.D
OBH849G

9
WIRING DIAGRAM6
MSZ-BT20VG- E1 ,ER1 MSZ-BT25VG- E1 ,ER1 MSZ-BT35VG- E1 ,ER1 MSZ-BT50VG- E1 ,ER1
MSZ-BT20VG- E2 ,ER2 MSZ-BT25VG- E2 ,ER2 MSZ-BT35VG- E2 ,ER2 MSZ-BT50VG- E2 ,ER2
OBH849G

10
MSZ-BT20VG- ET1 MSZ-BT25VG- ET1 MSZ-BT35VG- ET1 MSZ-BT50VG- ET1
UZAKTAN KUMANDA
ALICI DEVRE KARTI
İÇ ÜNİTE TERMİNAL
KARTI
DIŞ ÜNİTEYE
VARİSTÖR
TERMİNAL BLOĞU
RESİSTÖR
İÇ ÜNİTE ELEKTRONİK
KONTROL KARTI
Konektör
Terminal bloğu
NOTLAR:
1. Dış ünite elektronik kablolaması için dış ünite
elektronik kablo devre şemasını referans alınız.
2. Sadece bakır besleme kablosu kullanın
3. Sembolleri gösterir
ODA SICAKLIK
TERMİSTÖRÜ
BORU SICAKLIK
TERMİSTÖRÜ
(ANA)
BORU SICAKLIK
TERMİSTÖRÜ
(YARDIMCI)
SİGORTA
(T3.15AL250V)
FAN MOTORU
KANAT MOTORU
(YATAY)
RÖLE
PARÇA ADI
MSZ-BT20VG- E3 ,ER3 MSZ-BT25VG- E3 ,ER3 MSZ-BT35VG- E3 ,ER3 MSZ-BT50VG- E3 ,ER3
OBH849G

11
İÇ ÜNİTE
TERMİNAL KARTI
İÇ ÜNİTE ELEKTRONİK
KONTROL KARTI
DIŞ ÜNİTEYE
UZAKTAN
KUMANDA
ALICI DEVRE KARTI
Terminal bloğu
Konektör
NOTLAR:
1. Dış ünite elektronik kablolaması için dış ünite
elektronik kablo devre şemasını referans alınız.
2. Sadece bakır besleme
kablosu kullanın
3. Sembolleri gösterir
VARİSTÖR
TERMİNAL BLOĞU
RESİSTÖR
ODA SICAKLIK
TERMİSTÖRÜ
BORU SICAKLIK
TERMİSTÖRÜ (ANA)
BORU SICAKLIK
TERMİSTÖRÜ (YARDIMCI)
SİGORTA
(T3.15AL250V)
FAN MOTORU
KANAT MOTORU
(YATAY)
PARÇA ADI
RÖLE
MSZ-BT20VG- ET3 MSZ-BT25VG- ET3 MSZ-BT35VG- ET3 MSZ-BT50VG- ET3
Terminal bloğu
Konektör
NOTLAR:
1. Dış ünite elektronik kablolaması için dış ünite
elektronik kablo devre şemasını referans alını
z.
2. Sadece bakır besleme kablosu kullanın
3. Sembolleri gösterir
VARİSTÖR
TERMİNAL BLOĞU
RESİSTÖR
ODA SICAKLIK
TERMİSTÖRÜ
BORU SICAKLIK
TERMİSTÖRÜ (ANA)
BORU SICAKLIK
TERMİSTÖRÜ (YARDIMCI)
SİGORTA
(T3.15AL250V)
FAN MOTORU
KANAT MOTORU
(YATAY)
PARÇA ADI
RÖLE
İÇ ÜNİTE
TERMİNAL KARTI
İÇ ÜNİTE ELEKTRONİK
KONTROL KARTI
DIŞ ÜNİTEYE
UZAKTAN
KUMANDA
ALICI DEVRE KARTI
MSZ-BT20VG- ET2 , MSZ-BT25VG- ET2 MSZ-BT35VG- ET2 MSZ-BT50VG- ET2
OBH849G

12
MSZ-BT20VGK-
E1
,
ER1
MSZ-BT25VGK-
E1
,
ER1
MSZ-BT35VGK-
E1
,
ER1
MSZ-BT50VGK-
E1
,
ER1
MSZ-BT20VGK- E2 MSZ-BT25VGK- E2 MSZ-BT35VGK- E2 MSZ-BT50VGK- E2
OBH849G

13
MSZ-BT20VGK- ET1 MSZ-BT25VGK- ET1 MSZ-BT35VGK- ET1 MSZ-BT50VGK- ET1
İÇ ÜNİTE TERMİNAL
KARTI
İÇ ÜNİTE ELEKTRONİK
KONTROL KARTI
DIŞ ÜNİTEYE
UZAKTAN
KUMANDA
ALICI DEVRE KARTI
Wİ-Fİ
ARAYÜZÜ
Konektör
Terminal bloğu
NOTLAR:
1. Dış ünite elektronik kablolaması için dış ünite
elektronik kablo devre şemasını referans alınız.
2. Sadece bakır besleme kablosu kullanın
3. Sembolleri gösterir
VARİSTÖR
TERMİNAL BLOĞU
RESİSTÖR
ODA SICAKLIK
TERMİSTÖRÜ
BORU SICAKLIK
TERMİSTÖRÜ (ANA)
BORU SICAKLIK
TERMİSTÖRÜ (YARDIMCI)
SİGORTA
(T3.15AL250V)
FAN MOTORU
KANAT MOTORU
(YATAY)
PARÇA ADI
RÖLE
MSZ-BT20VGK-
E3
,
ER2
MSZ-BT25VGK-
E3
,
ER2
MSZ-BT35VGK-
E3
,
ER2
MSZ-BT50VGK-
E3
,
ER2
OBH849G

14
MSZ-BT20VGK- ET3 MSZ-BT25VGK- ET3 MSZ-BT35VGK- ET3 MSZ-BT50VGK- ET3
İÇ ÜNİTE
TERMİNAL KARTI
İÇ ÜNİTE ELEKTRONİK
KONTROL KARTI
DIŞ ÜNİTEYE
Wİ-Fİ
ARAYÜZÜ
UZAKTAN
KUMANDA
ALICI DEVRE KARTI
Terminal bloğu
Konektör
NOTLAR:
1. Dış ünite elektronik kablolaması için dış ünite
elektronik kablo devre şemasını referans alını
2. Sadece bakır besleme
kablosu kullanın
3. Sembolleri gösterir
VARİSTÖR
TERMİNAL BLOĞU
RESİSTÖR
ODA SICAKLIK
TERMİSTÖRÜ
BORU SICAKLIK
TERMİSTÖRÜ (ANA)
BORU SICAKLIK
TERMİSTÖRÜ (YARDIMCI)
SİGORTA
(T3.15AL250V)
FAN MOTORU
KANAT MOTORU
(YATAY)
PARÇA ADI
RÖLE
MSZ-BT20VGK- ET2 MSZ-BT25VGK- ET2 MSZ-BT35VGK- ET2 MSZ-BT50VGK- ET2
İÇ ÜNİTE
TERMİNAL KARTI
İÇ ÜNİTE ELEKTRONİK
KONTROL KARTI
DIŞ ÜNİTEYE
Wİ-Fİ
ARAYÜZÜ
UZAKTAN
KUMANDA
ALICI DEVRE KARTI
VARİSTÖR
TERMİNAL BLOĞU
RESİSTÖR
ODA SICAKLIK
TERMİSTÖRÜ
BORU SICAKLIK
TERMİSTÖRÜ (ANA)
BORU SICAKLIK
TERMİSTÖRÜ (YARDIMCI)
SİGORTA
(T3.15AL250V)
FAN MOTORU
KANAT MOTORU
(YATAY)
PARÇA ADI
RÖLE
Terminal bloğu
Konektör
NOTLAR:
1. Dış ünite elektronik kablolaması için dış ünite
elektronik kablo devre şemasını referans alını
z.
2. Sadece bakır besleme kablosu kullanın
3. Sembolleri gösterir
OBH849G

15
REFRIGERANT SYSTEM DIAGRAM7
Unit: mm
MSZ-BT20VG MSZ-BT25VG
MSZ-BT20VGK MSZ-BT25VGK
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11 Flared connection
Refrigerant pipe ø9.52
(with heat insulator)
Refrigerant pipe ø6.35
(with heat insulator)
Indoor coil
thermistor
RT12
Indoor coil
thermistor
RT13
Refrigerant flow in cooling
Refrigerant flow in heating
MSZ-BT35VG MSZ-BT50VG
MSZ-BT35VGK MSZ-BT50VGK
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe ø6.35
(with heat insulator)
Indoor coil
thermistor
RT12
Refrigerant pipe ø 9.52 (MSZ-BT35VG/VGK)
ø12.7 (MSZ-BT50VG/VGK)
(with heat insulator)
Indoor coil
thermistor
RT13
Refrigerant flow in cooling
Refrigerant flow in heating
OBH849G

16
8-2. HOW TO SET REMOTE CONTROLLER EXCLUSIVELY FOR A PARTICULAR INDOOR UNIT
A maximum of 4 indoor units with wireless remote controllers can be set.
To operate the indoor unit individually with each remote controller, assign a number to each remote controller according to
the number of the indoor unit.
Set according to the following procedure:
(1) Turn the breaker OFF for the unit.
(2) With the remote controller powered OFF, hold down UNIT button on the remote controller for
2 seconds to enter the pairing mode.
Setting number is displayed in the remote controller.
(3) Press UNIT button again and assign a number to each remote controller.
Each press of UNIT button advances the number in the following order: 1→2→3→4.
(4) Press to OPERATION SELECT( ) button complete the pairing setting.
After you turn the breaker ON, the remote controller that first sends a signal to an indoor unit will be regarded as the
remote controller for the indoor unit.
Once they are set, the indoor unit will only receive the signal from the assigned remote controller afterwards.
The setting of indoor unit will be cancelled, if the breaker is turned OFF or the power supply is shut down.
SERVICE FUNCTIONS8
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.
• After the breaker is turned on, the time for starting the compressor, which normally takes 3 minutes, can be reduced to 1
minute. Restarting the compressor, which takes 3 minutes, cannot be reduced.
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.
Operation
If the main power has been cut, the operation settings remain.
After the power is restored, the unit restarts automatically according to the memory.
(However, it takes at least 3 minutes for the compressor to start running.)
How to disable “AUTO RESTART FUNCTION”
Turn off the main power for the unit.
Cut the jumper wire to JR77 on the indoor electronic control P.C. board. (Refer to 10-7.)
NOTE:
• The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote
controller.
• If main power is turned OFF or a power failure occurs while AUTO START/STOP timer is active, the timer setting is can-
celled.
• If the unit has been turned OFF with the remote controller before power failure, the auto restart function does not work as
the power button of the remote controller is OFF.
• To prevent the breaker from tripping OFF due to the rush of starting current, systematize other home appliance not to
turn ON at the same time.
• When some air conditioners are connected to the same supply system, if they are operated before power failure, the
starting current of all the compressors may flow simultaneously at restart.
Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current
by adding to the system that allows the units to start one by one.
JR77
Indoor electronic
control P.C. board
CN111 CN151
GND
CN112
OBH849G

17
8-4. Wi-Fi INTERFACE SETTING UP (MSZ-BT·VGK)
3
4
5
6
21
• Ensure that the Router supports the WPA2-AES
encryption setting before starting the Wi-Fi interface
setup.
• The End user should read and accept the terms and
conditions of the Wi-Fi service before using this Wi-Fi
interface.
• To complete connection of this Wi-Fi interface to the
Wi-Fi service, the Router may be required.
• This Wi-Fi interface will not commence transmission
of any operational data from the system until the End
user registers and accepts the terms and conditions
of the Wi-Fi service.
• This Wi-Fi interface should not be installed and
connected to any Mitsubishi Electric system which is
to provide application critical cooling or heating.
• At the time of relocation or disposal, reset the
Wi-Fi interface to the factory
default.
ERR
NET
MODE
UNIT
RESET MODE
Wi-Fi INTERFACE
MODEL
MAC-123IFB-E
MAC
ID
SSID
KEY
: AABBCC112233
: 1812280001
: ME-A123456789
: ABCDEF123456
VOLTAGE
CURRENT: 12.7V
: 0.16A
MITSUBISHI ELECTRIC CORPRATION
WiFi.ASSY DWG No.
DK00J098B01
MADE IN CHINA
JG79C123H01
>PP<
3
4
5
6
1
2
Wi-Fi interface
Front panel
Wi-Fi interface
Front panel
This Wi-Fi interface communicates the status information
and controls the commands from the MELCloud by
connecting to an indoor unit.
(1) MODE switch
• The MODE switch is used for selecting modes
in configurations.
(2) RESET switch
• Hold down the RESET switch for 2 seconds
to reboot the system.
• Hold down the RESET switch for 14 seconds
to initialize the Wi-Fi interface to the factory default.
(1) Open the front panel and remove the Wi-Fi interface.
(2) Set up a connection between the Wi-Fi interface and the
router.
Refer to the SETUP MANUAL and SETUP QUICK
REFERENCE GUIDE provided with the unit.
For SETUP MANUAL, please go to the website below.
http://www.mitsubishielectric.com/ldg/ibim/
(3) Put the Wi-Fi interface back and close the front panel
after the setup is completed.
(4) For MELCloud User Manual, please go to the website
below.
https://www.melcloud.com/Support
NOTE:
When the Wi-Fi interface is reset to the factory default,
ALL the configuration information will be lost.
Take great care in implementing
this operation.
No. Item Description
1 MODE switch It selects modes.
2 RESET switch It resets the system and ALL settings.
3 ERR LED (Orange) It shows the network error state.
4 NET LED (Green) It shows the network state.
5 MODE LED (Orange) It shows the Access point mode state.
6 UNIT LED (Green) It shows the indoor unit state.
Wi-Fi interface introduction
NOTE:
Mitsubishi Electric’s Wi-Fi interface is designed for
communication to Mitsubishi Electric’s MELCloud Wi-Fi service.
Third party Wi-Fi interfaces cannot be connected to MELCloud.
Mitsubishi Electric is not responsible for any (i) under
performance of a system or any product; (ii) system or product
fault; or (iii) lossor damage to any system or product; which is
causedby or arises from connection to and/or use of any third
party Wi-Fi interface or any third party Wi-Fi service with
Mitsubishi Electric equipment.
For the latest information regarding MELCloud from
Mitsubishi Electric Corporation, please visit
www.melcloud.com.
OBH849G

18
MICROPROCESSOR CONTROL9
WIRELESS REMOTE CONTROLLER
NOTE: Last setting will be stored after the unit is turned OFF with the remote controller. Indoor unit receives the signal of the
remote controller with beeps.
Operation Indicator lamp
The operation indicator at the right side of the indoor unit indicates the operation state.
•The following indication applies regardless of shape of the indication.
INDOOR UNIT DISPLAY SECTION
button
Signal transmitting section
Operation display
section
Temperature
buttons
OFF/ON
(stop/operate)
FAN speed
control button
Operation select
button
ECONO COOL button
UNIT button
TIME, TIMER set buttons
forward button
backward button
RESET button
CLOCK button
NIGHT MODE button
Distance of signal : About 6 m
Beep(s) is (are) heard from
the indoor unit when the
signal is received.
ON-timer button
OFF-timer button
i save button
VANE control button
Battery replacement
indicator
Indication Operation state Room temperature
The unit is operating to
reach the set temperature About 2°C or more away from set temperature
The room temperature is
approaching the set tem-
perature About 1 to 2°C from set
temperature
Standby mode (only during
multi system operation)
-
Lit
Blinking
Not lit
MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG
MSZ-BT20VGK MSZ-BT25VGK MSZ-BT35VGK MSZ-BT50VGK
OBH849G

19
9-2. DRY ( ) OPERATION
(1) Press OFF/ON (stop/operate) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select DRY mode with Operation select button.
(3) The set temperature is determined from the initial room temperature.
1. Coil frost prevention
Coil frost prevention works the same way as that in COOL mode. (9-1.1.)
2. Low outside temperature operation
Low outside temperature operation works the same way as that in COOL mode. (9-1.2.)
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.
1. Coil frost prevention
The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil
from frosting.
When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works.
The indoor fan operates at the set speed and the compressor stops. This mode continues until the temperature of indoor
heat exchanger rises.
2. Low outside temperature operation
When the outside temperature is lower, low outside temperature operation starts, and the outdoor fan slows or stops.
9-3. FAN( )OPERATION
(1) Press OFF/ON (stop/operate) button.
OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone.
(2) Select FAN mode with Operation select button.
(3) Select the desired fan speed. When AUTO, it becomes Low.
Only indoor fan operates. Outdoor unit does not operate.
9-4. HEAT ( ) OPERATION
(1) Press OFF/ON (stop/operate) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select HEAT mode with Operation select button.
(3) Press Temperature buttons (TOO WARM or TOO COOL button) to select the desired temperature.
The setting range is 10 ~ 31°C.
1. Cold air prevention control
When the compressor is not operating or is starting, and the temperature of indoor heat exchanger and/or the room tem-
perature is low or when defrosting is being done, the indoor fan will stop or rotate in Very Low speed.
2. High pressure protection
The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the con-
densing pressure from increasing excessively.
When the temperature of indoor heat exchanger becomes too high, the high pressure protection works.
The indoor fan operates following the cold air prevention control. This mode continues until the temperature of indoor heat
exchanger falls.
3. Defrosting
Defrosting starts when the temperature of outdoor heat exchanger becomes too low.
The compressor stops once, the indoor/outdoor fans stop, the 4-way valve reverses, and the compressor re-starts.
This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes.
OBH849G

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. Other indoor units cannot operate,
and operation indicator lamp blinks as shown in the figure below. In this case, please set all the indoor units to the
same operation mode.
• 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. It is not malfunction. The reason is that the refrigerant continuously flows into it.
OPERATION INDICATOR
Lit
Blinking
Not lit
(7) SWING ( ) mode
By selecting SWING mode with VANE control button, the horizontal vane swings vertically.
(8) ECONO COOL ( ) operation (ECONOmical operation)
When ECONO COOL button is pressed in COOL mode, set temperature and the air flow direction is automati-
cally changed by the microprocessor. However, the temperature on the LCD screen on the remote controller is not
changed. Also the horizontal vane swings in various cycle.
SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher, the air
conditioner can keep comfort. As a result, energy can be saved.
To cancel this operation, select a different mode or press one of the following buttons in ECONO COOL operation:
ECONO COOL, VANE control button.
(5) STOP (operation OFF) and ON TIMER standby
In the following cases, the horizontal vane returns to the closed position.
(a) When OFF/ON (stop/operate) button is pressed (POWER OFF).
(b) When the operation is stopped by the the emergency operation.
(c) When ON TIMER is ON standby.
(6) Dew prevention
During COOL or DRY operation with the vane angle at Angle 3 to 5 when the compressor cumulative operation time
exceeds 1 hour, the vane angle automatically changes to Angle 2 for dew prevention.
9-6. AUTO VANE OPERATION
1. Horizontal vane
(1) Vane motor drive
These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of
the motor are controlled by pulse signals (approximately 12 V) transmitted from indoor microprocessor.
(2) The horizontal vane angle and mode change as follows by pressing VANE control button.
(AUTO) (1) (2) (3) (4) (5) (SWING)
(3) Positioning
To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the select-
ed angle.
Confirmation of standard position is performed in the following cases:
(a) When the operation starts or finishes (including timer operation).
(b) When the test run starts.
(c) When standby mode (only during multi system operation) starts or finishes.
(4) VANE AUTO ( ) mode
In VANE AUTO mode, the microprocessor automatically determines the vane angle to make the optimum room tem-
perature distribution.
Horizontal
position
In COOL and DRY operation
Vane angle is fixed to Horizontal position. In HEAT operation Vane angle is fixed to Angle 5.
5
OBH849G