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Luftkonditionering
MSZ-BT50VGK
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INDOOR UNIT
Outdoor unit service manual
MUZ-BT∙VG Series (OBH850)
MXZ-F∙VF Series (OBH890)
PARTS CATALOG (OBB849)
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 9 ·············
8. SERVICE FUNCTIONS 10 ······························
9. MICROPROCESSOR CONTROL ················ 13
10. TROUBLESHOOTING ······························· 17
11. DISASSEMBLY INSTRUCTIONS ················· 31
SERVICE MANUAL
MSZ-BT25VG/VGK
No. OBH849
REVISED EDITION-B
OBH849 REVISED EDITION-A is void.
Revision B:
• MSZ-BT20/25/35/50VGK - E1 , ET1
have been added.
Models
MSZ-BT20VG
- E1 , ER1 , ET1 MSZ-BT20VGK - E1 , ET1
MSZ-BT25VG
- E1 , ER1 , ET1 MSZ-BT25VGK - E1 , ET1
MSZ-BT35VG
- E1 , ER1 , ET1 MSZ-BT35VGK - E1 , ET1
MSZ-BT50VG
- E1 , ER1 , ET1 MSZ-BT50VGK - E1 , ET1
2
Use the specied refrigerant only
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or re when the unit is being used, serviced, or disposed of.
Correct refrigerant is specied 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.
TECHNICAL CHANGES
1
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
<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 remove 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 o the power, exercise great caution not to
touch the live parts.
Revision A:
• MSZ-BT20/25/35/50VG - ER1 have been added.
Revision B:
• MSZ-BT20/25/35/50VGK - E1 , ET1 have been added.
OBH849B
3
PART NAMES AND FUNCTIONS
2
MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG
MSZ-BT20VGK MSZ-BT25VGK MSZ-BT35VGK MSZ-BT50VGK
ACCESSORIES
Model
MSZ-BT20VG MSZ-BT20VGK
MSZ-BT25VG MSZ-BT25VGK
MSZ-BT35VG MSZ-BT35VGK
MSZ-BT50VG MSZ-BT50VGK
Installation plate 1
Installation plate xing screw 4 × 25 mm 5
Wireless remote controller 1
Felt tape (For left or left-rear piping) 1
Battery (AAA) for remote controller 2
Remote controller
Operation indicator lamp
Remote control receiving
section
Emergency opera iont switch
Spec name plate
Horizontal vane
Air inlet
Air fi lter
(Air purifying
fi lter)
Air cleaning fi lter
(Silver-ionized
air purifi er fi lter,
option)
Front panel
Air outlet
Heat exchanger
Wi-Fi interface
(Only for MSZ-BT VGK) ·
OBH849B
4
SPECIFICATION
3
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 838 × 280 × 235mm
Weight kg 9.0
Special remarks
Air direction 5
Airow
Cooling
Super High
m3/h
654 792
High 660522
Med. 408 540
Low 312 456
Super Low 378252
Heating
Super High 714 846
High 714540
Med. 408 594
Low 300 468
Super Low 360252
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 760580
Super Low 660500
Heating
Super High 1,060 1,210
High 860 1,060
Med. 700 920
Low 770560
Super Low 640500
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 Wet-bulb temperature 24°C
Heating: Indoor Dry-bulb temperature 20°C Wet-bulb temperature 15°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
OBH849B
5
NOISE CRITERIA CURVES
4
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
Wet-bulb temperature 15°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
OBH849B
6
OUTLINES AND DIMENSIONS
5
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 MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG
MSZ-BT20VGK MSZ-BT25VGK MSZ-BT35VGK MSZ-BT50VGK
OBH849B
7
MSZ-BT20VG- E1 , ER1 MSZ-BT25VG- E1 , ER1 MSZ-BT35VG- E1 , ER1 MSZ-BT50VG- E1 , ER1
WIRING DIAGRAM
6
MSZ-BT20VG- ET1 MSZ-BT25VG- ET1 MSZ-BT35VG- ET1 MSZ-BT50VG- ET1
UZAKTAN KUMANDA
ALICI DEVRE KARTI
İÇ ÜNİTE TERMİNAL
KARTI
DI N TEYEŞ Ü İ
VARİSTÖR
TERM NAL BLO Uİ Ğ
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
OBH849B
8
MSZ-BT20VGK- E1 MSZ-BT25VGK- E1 MSZ-BT35VGK- E1 MSZ-BT50VGK- E1
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
OBH849B
9
REFRIGERANT SYSTEM DIAGRAM
7
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 ow in cooling
Refrigerant ow 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 ow in cooling
Refrigerant ow in heating
OBH849B
10
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.
SERVICE FUNCTIONS
8
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 rst 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.
OBH849B
12
• 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 Rout-
er 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 con-
ditions 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
MOD EL
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
12
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.melcloud.com/Support
(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.
http://www.melcloud.com/Support
NOTE:
Mitsubishi Electric’s Wi-Fi interface is designed for communication to Mit-
subishi 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 sys-
tem or any product; (ii) system or product fault; or (iii) loss or damage to any
system or product; which is caused by 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.
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
Wi-Fi interface
Front panel
Wi-Fi interface
Front panel
8-4. Wi-Fi INTERFACE SETTING UP (MSZ-BT·VGK)
OBH849B
13
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 tt bu on
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
MICROPROCESSOR CONTROL
9
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
OBH849B
14
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 xed time passes.
OBH849B
15
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 rst is selected. Other indoor units cannot operate,
and operation indicator lamp blinks as shown in the gure 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 ow may be
heard. It is not malfunction. The reason is that the refrigerant continuously ows 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 ow 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 dierent 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 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 conrm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the
selected angle.
Conrmation of standard position is performed in the following cases:
(a) When the operation starts or nishes (including timer operation).
(b) When the test run starts.
(c) When standby mode (only during multi system operation) starts or nishes.
(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
OBH849B
17
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.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the P.C. board.
3) When removing the P.C. board, hold the edge of the board with care NOT to apply stress on the components.
4) When connecting or disconnecting the connectors, hold the connector housing. DO NOT pull the lead wires.
TROUBLESHOOTING
10
Lead wiring Connector housing
<Incorrect> <Correct>
3. Troubleshooting procedure
1) Check if the OPERATION INDICATOR lamp on the indoor unit is blinking ON and OFF to indicate an abnormality.
To make sure, check how many times the OPERATION INDICATOR lamp is blinking ON and OFF before starting ser-
vice work.
2) Before servicing, check that the connector and terminal are connected properly.
3) When the electric control P.C. board seems to be defective, check the copper foil pattern for disconnection and the
components for bursting and discoloration.
4) When troubleshooting, Refer to 10-2, 10-3 and 10-4.
NOTE: 1. If RESET button is not pressed, the remote controller may not operate correctly.
2. This remote controller has a circuit to automatically reset the microprocessor when batteries are replaced.
This function is equipped to prevent the microprocessor from malfunctioning due to the voltage drop caused by the
battery replacement.
3. Do not use the leaking batteries.
Press RESET button with a thin instrument, and
then use the remote controller.
Remove the front lid and insert batteries.
Then reattach the front lid.
4. How to replace batteries
Weak batteries may cause the remote controller malfunction.
In this case, replace the batteries to operate the remote controller normally.
1.
Remove the front lid.
2. Insert the negative
pole of AAA alkaline
batteries fi rst
.
3. Install the front lid.
4.
Press RESET.
1. Press CLOCK.
3. Press CLOCK again.
2. Press the TIME buttons to set
the time.
Each press changes the clock
1 minute forward/backward
(10 minutes when pressed
longer).
MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG
MSZ-BT20VGK MSZ-BT25VGK MSZ-BT35VGK MSZ-BT50VGK
OBH849B
20
10-3. INSTRUCTION OF TROUBLESHOOTING
Indoor unit operates.
Outdoor unit does
not operate.
If blinking of OPERATION
INDICATOR lamp cannot be
checked, it can be checked
with failure mode recall
function.
Indoor unit operates.
Outdoor unit does
not operate normally.
Indoor unit does
not receive
the signal from
remote controller.
OPERATION INDICATOR
lamp on indoor unit is
blinking ON and OFF.
Outdoor unit
operates only
in Test Run
operation.
Outdoor unit
does not
operate even
in Test Run
operation.
Unit does not
operate nor-
mal operation
in COOL or
HEAT mode.
Indoor unit does
not operate, when
EMERGENCY
OPERATION
switch is pressed.
Indoor unit
operates, when
EMERGENCY
OPERATION
switch is pressed.
Check room
temperature
thermistor.
Refer to 10-
7. "Test point
diagram and
voltage".
Refer to "How
to check
inverter/com-
pressor".
Refer to
"Check of R.V.
coil".
Refer to 10-6.
"Check of remote
controller and
indoor electronic
control P.C. board".
1. Check indoor/outdoor connect-
ing wire.
2. Check if the power is supplied to
indoor unit.
• If power supply voltage is detected,
refer to 10-6. "Check of indoor
P.C. board and indoor fan motor".
• If power supply voltage is not
detected, refer to outdoor unit
service manual.
Left lamp
blink on and o
at 0.5-second
intervals
Cause:
Indoor/Outdoor
unit
• Miswiring or
trouble of serial
signal
Left lamp
2-time blink
Cause:
Indoor unit
• Trouble
of room
temperature
/ indoor coil
thermistor
Left lamp
3-time blink
Cause:
Indoor unit
• Trouble of
indoor fan
motor
Left lamp
4-time blink
Cause:
Indoor unit
• Trouble
of indoor
unit control
system
Left lamp
5-time blink
Cause:
Outdoor unit
• Outdoor
power sys-
tem abnor-
mality
Left lamp
6-time blink
Cause:
Outdoor unit
• Trouble of
thermistor in
outdoor unit
Left lamp
7-time blink
Cause:
Outdoor unit
• Trouble
of outdoor
control
system
Left lamp
14-time blink
or more
Cause:
Outdoor unit
• Other ab-
normality
Start
Refer to 10-
6. "How to
check mis-
wiring and
serial signal
error".
Check room
temperature
thermistor
and indoor
coil thermis-
tor. Refer to
10-7."Test
point diagram
and voltage".
Refer to 10-
6. "Check
of indoor fan
motor".
Replace the
indoor elec-
tronic control
P.C. board.
Refer to
"How to
check
inverter/com-
pressor".
Refer to
"Check of
outdoor ther-
mistors".
Replace the
inverter P.C.
board or
the outdoor
electronic
control P.C.
board.
Check "Flow
chart of the
detailed
outdoor unit
failure mode
recall func-
tion."
"Test Run operation"
means the operation
within 30 minutes after
EMERGENCY OPERA-
TION switch is pressed.
Refer to outdoor unit
service manual.
1. Check of the unit.
OBH849B
21
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.
Connect the Wi-Fi interface and the router by referring to
SETUP QUICK REFERENCE GUIDE and SETUP MANUAL. If
the connection failed, check the following and connect the Wi-Fi
interface and the router again:
- Make sure that communication distance is not too far between
the Wi-Fi interface and the router. Move the router closer to the
Wi-Fi interface.
- Make sure that the router uses WPA2-AES encryption.
- Make sure that the number of the connected devices to the
router does not exceed the limit.
If the NET lamp is not blinking, the Wi-Fi interface and the router
are not communicating properly. Move the router and check
whether the communication has been improved.
The following characters cannot be used with SSID, so please
change if you are using. [ " , ' , < , > , & ]
Communication between the Wi-Fi interface and the router (or
MELCloud) has been failed.
The following characters cannot be used with SSID, so please
change if you are using. [ " , ' , < , > , & ]
Refer to the SETUP MANUAL at the following URL.
http://www.melcloud.com/Support
Check the instruction manuals for the router and the device such as a
smartphone, and enable the Internet access.
There is a problem in communication between the air conditioner and
the Wi-Fi interface. Check whether the air conditioner can be oper-
ated with a remote controller.
If the air conditioner does not operate, Check indoor/outdoor connect-
ing wire and the power supply. (Check the indoor power P.C. board
and the indoor electronic control P.C. board)
If the indoor/outdoor wire is connected and the power supplied, hold
down the RESET switch of Wi-Fi interface for 2 seconds. The com-
munication with the air conditioner is normal if the UNIT lamp starts
blinking. (It may take a few minutes to blinking.)
If the problem persists, check the cable and the connector of Wi-Fi
interface.
If all else failed, replace the Wi-Fi interface.
If not improve it even if replace the Wi-Fi interface, replace the indoor
electronic control P.C. board.
Start
Is the UNIT lamp on the Wi-Fi interface blinking?
Can the device such as a smartphone be connected
to the Internet through the router?
Has pairing of the Wi-Fi interface and the router
been successfully completed?
Is the NET lamp on the Wi-Fi interface blinking?
Is the ERR lamp on the Wi-Fi interface blinking? If the problem persists, go through this
procedure again from the beginning.
Yes
Yes
Yes
Yes
No
No
No
No
No
Yes
OBH849B
22
No. Abnormal
point Operation indicator lamp Symptom Condition Remedy
1
Miswiring
or serial
signal
Left lamp blinks
.
0.5-second ON
0.5-second OFF
Indoor unit and
outdoor unit do
not operate.
The serial signal from the outdoor
unit is not received for 6 minutes.
• Refer to 10-6. "How to
check miswiring and serial
signal error".
2
Indoor coil
thermistor
Left lamp blinks
.
2-time blink
2.5-second OFF
The indoor coil or the room tem-
perature thermistor is short or
open circuit.
• Refer to the characteristics
of indoor coil thermistor, and
the room temperature ther-
mistor (10-7.).
Room tem-
perature
thermistor
3Indoor fan
motor
Left lamp blinks
.
3-time blink
2.5-second OFF
The rotational frequency feedback
signal is not emitted during the
indoor fan operation.
• Refer to 10-6. "Check of
indoor fan motor".
4Indoor con-
trol system
Left lamp blinks
.
4-time blink
2.5-second OFF
It cannot properly read data in the
nonvolatile memory of the indoor
electronic control P.C. board.
• Replace the indoor electronic
control P.C. board.
5
Outdoor
power sys-
tem
Left lamp blinks
.
5-time blink
2.5-second OFF
It consecutively occurs 3 times
that the compressor stops for
overcurrent protection or start-up
failure protection within 1 minute
after start-up.
• Refer to "How to check of
inverter/compressor".
Refer to outdoor unit service
manual
• Check the stop valve.
6Outdoor
thermistors
Left lamp blinks
.
6-time blink
2.5-second OFF
The outdoor thermistors short or
open circuit during the compressor
operation.
• Refer to "Check of outdoor
thermistor".
Refer to outdoor unit service
manual.
7
Outdoor
control sys-
tem
Left lamp blinks
.
7-time blink
2.5-second OFF
It cannot properly read data in the
nonvolatile memory of the inverter
P.C. board or the outdoor elec-
tronic control P.C. board.
• Replace the inverter P.C.
board or the outdoor elec-
tronic control P.C. board.
Refer to outdoor unit service
manual.
8Other ab-
normality
Left lamp blinks
.
14-time blink or more
2.5-second OFF
An abnormality other than above
mentioned is detected.
• Check the stop valve.
• Check the 4-way valve.
• Conrm the abnormality in
detail using the failure mode
recall function for outdoor
unit.
9
Outdoor
control sys-
tem
Upper lamp lights up.
Outdoor unit
does not oper-
ate
It cannot properly read data in the
nonvolatile memory of the inverter
P.C. board.
• Check the blinking pattern of
the LED on the inverter P.C.
board.
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 rst detection after the
power ON), the indoor fan motor turns OFF and OPERATION INDICATOR lamp blinks.
Lit
Blinking
Not lit
OPERATION INDICATOR
OBH849B
23
10-5. TROUBLE CRITERION OF MAIN PARTS
Part name Check method and criterion Figure
Room temperature
thermistor (RT11)
Indoor coil thermistor
(RT12, RT13)
Measure the resistance with a tester.
Refer to 10-7. "Test point diagram and voltage", "Indoor electronic control
P.C. board", for the chart of thermistor.
Indoor fan motor (MF) Check 10-6. "Check of indoor fan motor".
Vane motor (MV)
Measure the resistance between the terminals with a tester.
(Temperature: 10 - 30°C)
Color of the lead wire Normal
RED-SKY 262 ~ 328 Ω
SKY
SKY
RED
SKY SKY
ROTOR
OPERATION INDICATOR
No. Abnormal
point Operation indicator lamp Symptom Condition Remedy
1
MXZ type
Operation
mode
setting
Left lamp lights and right lamp blinks.
2.5-second OFF
Outdoor unit
operates but
indoor unit does
not operate.
The operation mode of the each indoor unit is
dierently set to COOL (includes DRY, FAN)
and HEAT at the same time, the operation
mode of the indoor unit that has operated at
rst has the priority.
• Unify the operation mode.
Refer to outdoor unit service
manual.
Lit
Blinking
Not lit
OBH849B
24
A Check of indoor fan motor
10-6. TROUBLESHOOTING FLOW
The indoor fan motor error has occurred, and the indoor fan does not operate.
Turn OFF the power supply.
Is there any foreign matter that interferes
the rotation of the line ow fan?
Yes
No
Remove the foreign matter and
adjust the line ow fan.
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
EMERGENCY OPERATION switch.
Measure the supply voltage as follows within 12 seconds after EMER-
GENCY OPERATION switch is pressed.
If more than 12 seconds passes, turn OFF the power supply and turn it
ON again, then measure the voltage.
<Indoor electronic control P.C. board>
1. Measure the voltage between CN211 (+) and (–).
2. Measure the voltage between CN211 (+) and (–).
If more than 12 seconds passes after EMERGENCY OPERATION switch
is pressed, the voltage measured at 2. above goes 0 V DC although the
indoor P.C. board is normal.
Does the voltage between CN211
(+) and (–) on the power P.C. board
rise to the range of 3 to 6 V DC within
12 seconds after EMERGENCY
OPERATION switch is pressed?
Replace the indoor fan motor.
Yes
No
The indoor fan motor error has occurred, and the indoor fan repeats "12-second ON and 30-second OFF" 3 times, and then stops.
Measure the voltage between CN211
(+) and (–) while the fan motor is
rotating.
Is it unchanged holding 0
or 15 V DC? No
(Changed)
Yes
(Unchanged)
Replace the indoor fan motor.
Is there 325 V DC
between CN211 (+)
and (–) ? Yes
Replace the indoor electronic
control P.C. board.
Replace the indoor electronic
control P.C. board.
No
OBH849B
26
C Check of indoor P.C. board and indoor fan motor
Turn OFF the power supply.
Remove indoor fan motor connector CN211
and vane motor connector CN151 from the
indoor electronic control P.C. board and turn
ON the power supply.
Does the unit operate with the remote
controller?
Does OPERATION INDICATOR lamp light
up by pressing EMERGENCY OPERATION
switch?
Yes
No
Measure the resistance of indoor fan
motor.
Refer to 10-5.
Short circuit:
Replace the indoor fan motor.
Turn OFF the power supply.
Check both “parts side” and “pattern
side” of the indoor power P.C. board
visually.
Replace the varistor (NR11)
and fuse (F11). 1
Are the varistor (NR11)
burnt and the fuse (F11)
blown? No
No
Yes
Yes
Be sure to check both the fuse
and the varistor in any case.
Is the fuse (F11) blown
only?
Measure the resistance between
CN211 (+) and (-) of indoor fan
motor connector. 2, 3
Yes
Is the resistance 1MΩ or more? Replace the fuse (F11) and the
indoor fan motor. 3
No
Replace the fuse (F11). 1
Measure the resistance of resistor (R111)
on the indoor power P.C. board. No
Replace the indoor electronic
control P.C. board and the indoor
fan motor.
Replace the indoor electronic control P.C. board.
Measure the resistance of the vane
motor coil.
Refer to 10-5.
Short circuit:
Replace the vane motor and the indoor
electronic control P.C. board.
1. Please replace the fuse after removing the
indoor power P.C. board from the electrical
box.
2. The fan motor connector's lead wire is red,
whereas is black.
3. Connect "+" of the tester to fan motor
connector's lead wire, and “-” to lead wire,
otherwise the resistance cannot be measured
properly.
Is the resistance of resistor (R111)
approximately 4 Ω ?
Yes
Indoor electronic
control P.C. board
GND
12 VDC
5 VDC
FUSE (F11)
Varistor (NR11)
OBH849B
27
D How to check miswiring and serial signal error
MUZ Type
Turn the power supply OFF.
Is there rated voltage in the power supply?
Yes No
Check for incorrect indoor-outdoor connecting wiring.
Check the power supply.
Is there rated voltage between outdoor terminal
block S1 and S2?
Yes
Check for miswiring, broken wires, and loose
wire connection between the power supply and
outdoor terminal block S1 and between the
power supply and outdoor terminal block S2.
Wait for 2 or more minutes after the power supply is
turned on.
Touch S2 and S3 with tester probes and start the
emergency operation.
When the emergency operation starts, does the
rated voltage occur for 2 seconds between indoor
terminal block S2 and S3?
No
Does the indoor left OPERATION INDICATOR
lamp blink continuously 6 minutes after the
emergency operation starts? No Does the outdoor LED light up?
Replace the indoor electronic control P.C.
board.
Yes
Does the outdoor LED blink 6 times?
Conrm that the thermostat is OFF and
wiring is not loose.
No
Does DC (6 V or more) occur between indoor
terminal block S2 and S3?
Yes
Replace the outdoor inverter P.C. board.
*1
No
Replace the indoor electronic control P.C. board.
*1 Electric charge may remain immediately after
the power supply is turned OFF.
Perform the procedure 3 minutes after the
power o operation.
Replace the outdoor inverter P.C. board.*1
Yes
No
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. Refer to “Deleting the memorized abnormal
condition” described in 12-2.1 to clear the error history. When
the error history is being cleared, the connection information
also will be initialized. The indoor unit will be compatible with a
low-standby-power model after initialization.
OK
Yes
Turn ON the power supply.
• Turn OFF inverter-controlled lighting equipment.
• Turn OFF the power supply and then turn ON again.
• Press EMERGENCY OPERATION switch.
Is serial signal error indicated 6 minutes later?
Yes
• Reinstall either the unit or the light away from
each other.
• Attach a lter on remote control receiving
section of the indoor unit.
No
No
No
Yes
Yes
OBH849B
28
MXZ Type
Is there rated voltage in
the power supply?
Is there any miswiring,
poor contact, or wire
disconnection of the
indoor/outdoor
connecting wire?
1 Miswiring may damage indoor electronic control
P.C. board during the operation.
Be sure to confirm the wiring is correct before the
operation starts.
No
(Lit
or not lit)
No
Yes
No
Yes
Yes
Yes
No
Be sure to release the failure-mode
recall function after checking.
No
No
Yes
No
Yes
Yes
Yes
No Yes
Turn OFF the power supply.
Turn ON the power supply.
Is there rated voltage between
outdoor terminal block S1 and
S2?
Does the upper lamp of OPERATION
INDICATOR lamp on the indoor unit light up?
<Confirmation of the power to the indoor unit>
Press EMERGENCY OPERATION switch once.
Check the power supply.
Turn OFF the power supply.
Check once more if the indoor/outdoor
connecting wire is not miswiring.
Bridge the outdoor terminal block S2 and
S3. 1
Turn ON the power supply.
Check the wiring.
Correct them.
Is there rated voltage between
indoor terminal block S1 and S2?
<Confirmation of power voltage>
Replace the indoor electronic control P.C. board.
2 Be careful of the residual
voltage of smoothing capacitor.
Replace the control outdoor P.C. board.
2
Is there any error of the
indoor/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
Replace the
indoor/outdoor
connecting wire.
Is serial signal error
indicated 6 minutes later?
Yes
No
· Turn OFF inverter-controlled lighting
equipment.
· Turn OFF the power supply and
then turn ON again.
· Press EMERGENCY OPERATION
switch.
· Reinstall either the unit or the light away
from each other.
· Attach a lter on remote control receiving
section of the indoor unit.
Is serial signal error indicated 6 minutes later?
No
Does the LED on the outdoor control P.C.
board repeat "3.6-second-OFF
and 0.8-second-ON quick blinking"?
LED indication
for communication status
Communication status is indicated by the LED.
Blinking: normal communication
Lighting: abnormal communication or
not connected
Pattern 1 and 2 is repeatedly displayed
alternately. Each pattern is displayed for
10 seconds.
NOTE: "Lighting" in the table below does not
indicate abnormal communication.
Unit status
Outdoor control P.C. board
Blinking
LED1 LED2 LED3
LED 1 LED 3LED 2
Pattern
1
2
3
Unit B
status
Unit C
status
Unit A
status
Unit D
status
Unit E
status
Not lit
Lit
Blinking
Turn OFF the power supply.
Remove the bridge between outdoor
terminal block S2 and S3.
Turn ON the power supply.
Is there amplitude of 10 to 20 V DC
between outdoor terminal block S2 and
S3? <Conrmation of serial signal>
OBH849B
29
E Electromagnetic noise enters into TV sets or radios
Yes
Is the unit earthed? No Earth the unit.
Yes
Is the distance between the antennas
and the indoor unit within 3 m, or is the
distance between the antennas and the
outdoor unit within 3 m?
No
Extend the distance between the antennas and
the indoor unit, and/or the antennas and the
outdoor unit.
Is the distance between the TV sets or
radios and the indoor unit within 1 m, or
is the distance between the TV sets or
radios and the outdoor unit within 3 m? Yes
Extend the distance between the TV sets and/
or radios and the indoor unit, or the TV sets or
radios and the outdoor unit.
Are the antennas damaged?
Is the coaxial cable damaged?
Is there any poor contact in the anten-
na wiring? Yes
No
No
Replace or repair the antenna.
Replace or repair the coaxial cable.
Is the indoor/outdoor connecting wire
of the air conditioner and the wiring of
the antennas close? Yes
Extend the distance between the indoor/outdoor
connecting wire of the air conditioner and the wir-
ing of the antennas.
No
Even if all of the above conditions are fullled, the electromagnetic noise may enter, depending on the electric eld strength
or the installation condition (combination of specic conditions such as antennas or wiring).
Check the following before asking for service.
1. Devices aected by the electromagnetic noise
TV sets, radios (FM/AM broadcast, shortwave)
2. Channel, frequency, broadcast station aected by the electromagnetic noise
3. Channel, frequency, broadcast station unaected by the electromagnetic noise
4. Layout of:
indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, earth wire, antennas, wiring from antennas, receiver
5. Electric eld intensity of the broadcast station aected by the electromagnetic noise
6. Presence or absence of amplier such as booster
7. Operation condition of air conditioner when the electromagnetic noise enters in
1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic
noise.
2) Within 3 minutes after turning ON the power supply, press OFF/ON (stop/operate) button on the remote controller for
power ON, and check for the electromagnetic noise.
3) After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the
electromagnetic noise.
4) Press OFF/ON (stop/operate) button on the remote controller for power OFF, when the outdoor unit stops but the
indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise.
OBH849B
30
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
Indoor electronic control P.C. board
Room temperature thermistor (RT11)
Indoor coil thermistor (
RT12, RT13)
Temperature (°C)
Resistance (kΩ)
Connector to Indoor
fan motor (CN211)
Resistor (R111)
Room temperature
thermistor RT11
(CN111)
Connector to Indoor
coil thermistor (CN112)
RT12, RT13
Connector to
vane motor (CN151)
12 V DC
5 V DCGNDTo disable "Auto restart
function",cut the Jumper
wire to JR77. (Refer to 8-3.)
Fuse (F11)
T3.15AL250V
Varistor (NR11)
Emergency operation
switch (E.O. SW) (SW1)
Indoor terminal P.C. board
Power monitor receiver SW P.C. board
MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG
MSZ-BT20VGK MSZ-BT25VGK MSZ-BT35VGK MSZ-BT50VGK
Connector to
Wi-Fi interface (CN105)
OBH849B
OPERATING PROCEDURE PHOTOS/FIGURES
1. Removing the panel
(1) Remove the screw caps on the panel and remove the
screws of the panel.
(2) Pull the panel slightly toward you, and then remove the
panel by pushing it upward.
31
(1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector shown
below has the locking mechanism.
Slide the sleeve.
Pull the terminal while
pushing the locking
lever.
Hold the sleeve, and
pull out the terminal
slowly.
Connector
Sleeve
Locking lever
<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.
DISASSEMBLY INSTRUCTIONS
11
11-1. MSZ-BT20VG MSZ-BT25VG MSZ-BT35VG MSZ-BT50VG
NOTE: Turn OFF the power supply before disassembly.
Photo 1
Screws of the panel
Horizontal vane
Front panel
: Indicates the visible parts in the photos/gures.
: Indicates the invisible parts in the photos/gures.
OBH849B
OPERATING PROCEDURE PHOTOS/FIGURES
3. Removing the nozzle assembly and the vane
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. (Refer to section 2.)
(4) Disconnect the following connectors on the electronic
control P.C. board:
CN151 (Vane motor)
(5) Pull out the drain hose from the nozzle assembly and
remove the nozzle assembly.
<Removing the vane motor>
(6) Cut the fixing band of the vane motor wire. (Photo 5)
(7) Remove the screws of the vane motor and remove the
vane motor. (Photo 6)
(8) Disconnect the connector from the vane motor.
33
Photo 6
Screws of the vane motor
Fixing band of the vane motor wire
Photo 5
OBH849B
OPERATING PROCEDURE PHOTOS/FIGURES
4. Removing the indoor fan motor, the indoor coil
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 xing the motor bed.
(4) Loosen the screw xing the line ow fan.
(5) Remove the motor bed together with the indoor fan
motor and the motor band.
(6) Disconnect the lead wire of the fan motor from the
motor band.
(7) Disengage the hooks of the motor band and remove
the motor band. Pull out the indoor fan motor.
(8) Remove the indoor coil thermistor from the heat
exchanger.
Install the indoor coil thermistor in its former position
when assembling it.
(9) Remove the screws xing the left side of the heat
exchanger.
(10)
Lift the heat exchanger, and pull out the line ow fan to
the lower-left.
When attaching the line ow fan, screw the line ow fan
so 4 mm gap is provided between the right end of the
line ow fan and the right wall of the air passage of the
box (Figure 1).
34
Photo 7
Screw of the line ow fan
Figure 1
4 mm
Screws of the left
side of the heat
exchanger
Photo 9
Photo 8
Motor band
Screws of
the motor bed
Photo 10
Direction to pull
OBH849B
OPERATING PROCEDURE PHOTOS/FIGURES
2. Removing the Wi-Fi interface
(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.
(3) Remove the screw of the electrical cover, and remove
the electrical cover.
(4) Disconnect the following connector (Photo 3-2):
<Indoor electronic control P.C. board>
CN105 (Wi-Fi interface)
(5) Remove the lead wire of the Wi-Fi interface from the
hook of the cable guide and water cut.
Photo 2
3. Removing the indoor electrical box
(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.
(3) Remove the earth wire connected to the indoor heat
exchanger from the electrical box.
(4) Remove the screw of the electrical cover and remove
the electrical cover.
(5) Disconnect following connectors:
<Indoor electronic control P.C. board>
CN151 (Vane motor)
CN105 (Wi-Fi interface)
<Indoor power P.C. board>
CN211 (Indoor fan motor)
(6) Remove the lead wire of the Wi-Fi interface, and
remove the Wi-Fi interface (Refer to section 2.).
(7) Unhook the upper and lower catch of the electrical
box, and pull out the electrical box.
NOTE:
To attach the electrical box, pass the wires connecting
the indoor power monitor receiver SW P.C. board and the
indoor electronic control P.C. board through A. Pass the
lead wires of the fan motor through B as shown in the
Photo 3-1.
36
Indoor power
P.C. board
Upper catch of
the electrical box
Screw of
the V.A. clamp
Display P.C. board
holder
Screw of
the electrical cover
Electrical box
Earth wire connected
to the indoor heat
exchanger
Screw of
the terminal block
Indoor
electronic
control P.C.
board
Earth wire
connected to the
electrical box
Lower catch of
the electrical box
Wi-Fi interface
Wi-Fi interface
Wi-Fi interface
connector (CN105)
Photo 3-1
Photo 3-2
Indoor fan motor
connector (CN211)
Vane motor
connector (CN151)
Insulations*1
A B
Electrical box
Room temperature
thermistor
connector
(CN111)
Catch of indoor electronic
control P.C. board holder
OBH849B
Produktspecifikationer
| Varumärke: | Mitsubishi |
| Kategori: | Luftkonditionering |
| Modell: | MSZ-BT50VGK |
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