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