Mitsubishi Electric MS-GA50VB User manual

CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················2
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. TROUBLESHOOTING······································11
10. DISASSEMBLY INSTRUCTIONS·····················19
11. PARTS LIST······················································21
12. RoHS PARTS LIST···········································23
13. OPTIONAL PARTS···········································25
SPLIT-TYPE, AIR CONDITIONERS
MS-GA50VB -
MS-GA60VB -
MS-GA80VB - E1
E1
E1
SERVICE MANUAL
Wireless type
Models
INDOOR UNIT
NOTE:
This service manual describes technical data of the indoor units.
RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the RoHS PARTS LIST (RoHS compliant).
Outdoor unit service manual
MU-GA•VB Series (OB370)
No. OB369
REVISED EDITION-B
Revision B :
• Indoor heat exchanger of MS-GA80VB - has been changed.
• PARTS LIST and RoHS PARTS LIST have been changed.
E1
Please void OB369 REVISED EDITION-A.
OB369B.qxp 07.5.21 0:06 PM Page 1

TECHNICAL CHANGES
2
1
PART NAMES AND FUNCTIONS
2
Grille
(When the grille is opened)
Remote controller
Operation section Display section
Emergency operation switch
Operation indicator lamp
Air inlet
To breaker
Power supply cord
Remote control
receiving section
Air cleaning filter (option)
(White bellows type)
Horizontal vane
Vertical vanes
Catechin air filter
Remote control
receiving section
Catechin air filter
Front panel
MS-GA50VB
MS-GA60VB
MS-GA80VB
MS-A18WV - ➔MS-GA50VB -
MS-A24WV - ➔MS-GA60VB -
MS-A30WV - ➔MS-GA80VB -
1. Model name has been changed.
Indication of capacity has been changed. (BTU➔kW)
2. Grille design has been changed.
3. Unit size has been changed.(W 1,100aoH 325aoD 227a➔W1,100aoH 325aoD 258a)
E1E1
E1E1
E1E1
ACCESSORIES
1
2
3
4
5
6
7
Installation plate
Installation plate fixing screw 4 o25 mm
Remote controller holder
Fixing screw for 3o3.5 o1.6 mm (Black)
Battery (AAA) for remote controller
Wireless remote controller
Felt tape (Used for left or left-rear piping)
1
7
1
2
2
1
1
MS-GA50VB
MS-GA60VB
MS-GA80VB
Revision A :
•RoHS PARTS LIST has been added.
Revision B :
•Indoor heat exchanger of MS-GA80VB - has been changed.
•PARTS LIST and RoHS PARTS LIST have been changed.
E1
OB369B.qxp 07.5.21 0:06 PM Page 2

REMOTE CONTROLLER
MS-GA50VB
MS-GA60VB
MS-GA80VB
3
ON/OFF
TOO
COOL
PM
AM
TOO
WARM
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
MODE
ECONO COOL
STOP
START
HR.
MIN.
WIDE VANE
LONG
I FEEL COOL
DRY
PM
CLOCK
AM
RESET CLOCK
FAN
Open the front lid.
Signal transmitting section
Operation display section
OPERATE/ STOP
(ON/ OFF) button
TEMPERATURE buttons
OPERATION SELECT button
FAN SPEED CONTROL button
OFF-TIMER button
HR. button
MIN. button
(TIME SET button)
ON-TIMER button
RESET button
ECONO COOL button
VANE button
(Horizontal vane button)
CLOCK SET button
LONG button
WIDE VANE button
(Vertical vane button)
Indication of remote controller
model is on back.
OB369B.qxp 07.5.21 11:21 AM Page 3

SPECIFICATION
4
3
Indoor model
Function
Power supply
Air flow
(High/Med./Low)
Power outlet
Running current
Power input
Power factor
Fan motor current
Model
Winding
resistance(at 20:)
Dimensions WOHOD
Weight
Air direction
Sound level(High/Med./Low)
Fan speed(High/Med./Low)
Fan speed regulator
Thermistor RT11(at 25:)
Thermistor RT12(at 25:)
Remote controller model
K/h
A
A
W
%
A
"
mm
kg
dB
rpm
k"
k"
MS-GA50VB
Cooling
Single phase
230V, 50Hz
768/642/528
10
0.30
60
87
0.30
RC4V32-AA
WHT-BLK 293
BLK-RED 146
1,100O325O258
16
5
42/38/34
1,070/920/780
3
10
10
KM04B
MS-GA60VB
Cooling
Single phase
230V, 50Hz
768/672/588
10
0.30
60
87
0.30
RC4V32-AA
WHT-BLK 293
BLK-RED 146
1,100O325O258
16
5
45/41/37
1,070/960/850
3
10
10
KM04B
Electrical data
Fan motor
Special remarks
Capacity
NOTE: Test conditions are based on ISO 5151.
Cooling : Indoor DB27°C WB19°C
Outdoor DB35°C WB(24°C)
Indoor-Outdoor piping length : 5m
Indoor model
Function
Power supply
Air flow
(High/Med./Low)
Power outlet
Running current
Power input
Power factor
Fan motor current
Model
Winding
resistance(at 20:)
Dimensions WOHOD
Weight
Air direction
Sound level(High/Med./Low)
Fan speed(High/Med./Low)
Fan speed regulator
Thermistor RT11(at 25:)
Thermistor RT12(at 25:)
Thermistor RT13(at 25:)
Remote controller model
K/h
A
A
W
%
A
"
mm
kg
dB
rpm
k"
k"
k"
MS-GA80VB
Cooling
Single phase
230V, 50Hz
960/822/684
10
0.34
69
88
0.34
RC4V40-AA
WHT-BLK 138.2
BLK-RED 159.0
1,100O325O258
16
5
47/42/37
1,280/1,130/970
3
10
10
10
KM04B
Electrical data
Fan motor
Special remarks
Capacity
OB369B.qxp 07.5.21 11:21 AM Page 4

5
NOISE CRITERIA CURVES
4
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:
47
SPL(dB(A)) LINE
High
FAN SPEED
MS-GA80VB
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
42
SPL(dB(A)) LINE
High
FAN SPEED
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
45
SPL(dB(A)) LINE
High
FAN SPEED
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
MS-GA50VB MS-GA60VB
INDOOR UNIT WALL
MICROPHONE
0.8m
1m
OB369B.qxp 07.5.21 11:21 AM Page 5

OUTLINES AND DIMENSIONS
6
5
258
162
19
58
47
7.5
315
255.547
2.5
98 173
98 173414.5 414.5
5
253
791
56
1068
1100
325
Air out
Air in
Insulation [28
Drain hose [16
(Connected part O.D)
Installation plate
Wall hole [75
Wireless remote controller
Installation plate Indoor unit
{
Liquid line [6.35-0.5m
Gas line [12-0.43m
Insulation [50 O.D
[32 I.D
{
Liquid line [9.52-0.5m
Gas line [12-0.43m
Insulation [50 O.D
[32 I.D
for MS-GA50/60VB
for MS-GA80VB
Power supply cord
Lead to right 2.0m
Lead to left 1.0m
MS-GA50VB
MS-GA60VB
MS-GA80VB
Unit: mm
OB369B.qxp 07.5.21 11:21 AM Page 6

7
WIRING DIAGRAM
6
MS-GA50VB
MS-GA60VB
12V BLK
GRY
YLW
BRN
WHT
RED
3
SR141 4
3
1
CN
121
C11
HIC1
MV1
2
1
CN112
151
CN
MV2
15
RT12
RT11
111
CN
CN211
NR11
ELECTRONIC CONTROL
P. C. BOARD
F11
LBRN
1
2
3
CN201
MV2
CN
101
CN
102
DISPLAY
P. C. BOARD RECEIVER
P. C. BOARD
REMOTE
CONTROLLER
33
TAB12
GRN/YLW
N
TB 2
1
2
1
CN202
TO OUTDOOR UNIT
CONNECTING BLK
WHT
BLU
BRN
BLU
1.About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing.
2.Use copper conductors only. (For field wiring)
3.Symbols below indicate. : Connector
: Terminal block
NOTES:
SYMBOL
C11
F11
HIC1
MF
NAME
INDOOR FAN CAPACITOR
FUSE (3.15A)
DC/DC CONVERTER
INDOOR FAN MOTOR (INNER FUSE)
SYMBOL
MV1
MV2
NR11
RT11
NAME
VANE MOTOR (HORIZONTAL)
VANE MOTOR (VERTICAL)
VARISTOR
ROOM TEMPERATURE THERMISTOR
SYMBOL
RT12
SR141
TB
NAME
INDOOR COIL THERMISTOR
SOLID STATE RELAY
TERMINAL BLOCK
MF
1
2
3
4
5
6
PE CIRCUIT
BREAKER
POWER
SUPPLY
CORD
~/N 230V
50Hz
12V
TO OUTDOOR
UNIT
CONNECTING
BRN
BLU
GRN/YLW
BLK
GRY
YLW
BRN
WHT
RED
MF
3
SR141 4
3
1
CN
121
C11
HIC1
MV1
RT13
4
3
2
1
CN112
151
CN
MV2
15
RT12
RT11
111
CN
CN211
NR11
ELECTRONIC CONTROL
P. C. BOARD
F11
3
N
LBRN
1
2
3
CN201
MV2
BLU
RED
CN
101
CN
102
DISPLAY
P. C. BOARD RECEIVER
P. C. BOARD
REMOTE
CONTROLLER
33
TAB12
TB
PE CIRCUIT
BREAKER
POWER
SUPPLY
CORD
~/N 230V
50Hz
1.About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing.
2.Use copper conductors only. (For field wiring)
3.Symbols below indicate. : Connector
: Terminal block
NOTES:
SYMBOL
SR141
TB
SYMBOL
MV2
NR11
RT11
RT12
RT13
SYMBOL
C11
F11
HIC1
MF
MV1
NAME NAME NAME
INDOOR FAN CAPACITOR
FUSE(3.15A)
DC/DC CONVERTER
INDOOR FAN MOTOR(INNER PROTECTOR)
VANE MOTOR(HORIZONTAL)
VANE MOTOR(VERTICAL)
VARISTOR
ROOM TEMPERATURE THERMISTOR
INDOOR COIL THERMISTOR (MAIN)
INDOOR COIL THERMISTOR (SUB)
SOLID STATE RELAY
TERMINAL BLOCK
MS-GA80VB
OB369B.qxp 07.5.21 11:21 AM Page 7

REFRIGERANT SYSTEM DIAGRAM
8
7
MS-GA80VB
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT13(sub)
Flared connection
Refrigerant pipe [15.88
(with heat insulator)
Refrigerant pipe [9.52
(with heat insulator)
Indoor coil
thermistor
RT12(main)
Strainer
#50
Refrigerant flow in cooling
MS-GA50VB
Indoor
heat
exchanger
Room temperature
thermistor
RT11
Refrigerant pipe [12.7
(with heat insulator)
Flared connection
Flared connection
Indoor coil
thermistor
RT12
Refrigerant pipe [6.35
(with heat insulator)
Distributor
MS-GA60VB
Indoor
heat
exchanger
Room temperature
thermistor
RT11
Refrigerant pipe [15.88
(with heat insulator)
Flared connection
Flared connection
Indoor coil
thermistor
RT12
Refrigerant pipe [6.35
(with heat insulator)
Distributor
Unit:mm
OB369B.qxp 07.5.21 11:21 AM Page 8

9
SERVICE FUNCTIONS
8
8-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION
A maximum of 4 indoor units with wireless remote controllers can be used in a room.
In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be
modified according to the number of the indoor unit.
How to modify the remote controller P.C. board
Remove batteries before modification.
The board has a print as shown below :
8-1. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board.
The time will be shortened as follows.
Set time : 1 minute ➔ 1-second
Set time : 3 minute ➔ 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is
shortened by short circuit of JPG and JPS.)
The P.C. board has the print “J1”and “J2”. Solder “J1”and “J2”according to the number of indoor unit as shown in Table 1.
After modification, press the RESET button.
MS-GA50VB
MS-GA60VB
MS-GA80VB
J2
J1
Table 1
No. 1 unit
No. 2 unit
No. 3 unit
No. 4 unit
1 unit operation
No modification
–
–
–
2 units operation
Same as at left
Solder J1
–
–
3 units operation
Same as at left
Same as at left
Solder J2
–
4 units operation
Same as at left
Same as at left
Same as at left
Solder both J1 and J2
How to set the remote controller exclusively for particular indoor unit
After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the
remote controller for the indoor unit.
The indoor unit only accepts the signal from the remote controller that has been assigned to the indoor unit once they are
set. The setting will be cancelled if the breaker has turned OFF, or the power supply has shut down.
Please conduct the above setting once again after the power has restored.
NOTE : For modification, take out the bat-
teries and press the OPERATE/
STOP (ON/ OFF) button 2 or 3
times at first.
After modification, put back the
batteries then press the RESET
button.
OB369B.qxp 07.5.21 11:21 AM Page 9

10
How to release “AUTO RESTART FUNCTION”
1Turn OFF the main power for the unit.
2Pull out the electronic control P.C. board, the receiver P.C.
board and the display P.C. board. (Refer to 10.2.)
3Solder jumper wire to JR07 on the indoor electronic control
P.C. board. (Refer to 9-6.)
JR07
IC152
CN151
CN112
CN111
CN121
SW1
IC101
RA102
C11
CN201
CN211
TAB12
Operation
1If the main power has been cut, the operation settings remain.
2After 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.)
NOTE
•The operation settings are memorized when 10 seconds have passed after the remote controller 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
cancelled.
•If the unit has been 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 breaker OFF due to the rush of starting current, systematize other home appliances 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.
When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed are
memorized by the indoor electronic control P.C. board. The “AUTO RESTART FUNCTION”sets to work the moment power
has restored after power failure. Then, the unit will restart automatically. However if the unit is operated in “I FEEL CON-
TROL”mode before power failure, the operation is not memorized. In “I FEEL CONTROL”mode, the operation is decided
by the initial room temperature.
8-3. AUTO RESTART FUNCTION
OB369B.qxp 07.5.21 11:21 AM Page 10