SPLIT-TYPE, AIR CONDITIONERS
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
INDOOR UNIT
SERVICE MANUAL
Wireless type
Models
No. OB439
MSC-CB20VB MSC-CB25VB MSC-CB35VB -
MSC-CB20VB
MSC-CB25VB
MSC-CB35VB
E1
E1
E1
Outdoor unit service manual
MU-GA·VB Series (OB386)
MUH-GA·VB Series (OB387)
MUX-A·VB Series (OB384)
MXZ-A·WV Series (OB319)
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················3
3. SPECIFICATION·················································5
4. NOISE CRITERIA CURVES·······························6
5. OUTLINES AND DIMENSIONS·························7
6. WIRING DIAGRAM ············································8
7. REFRIGERANT SYSTEM DIAGRAM················8
8. SERVICE FUNCTIONS ······································9
9. TROUBLESHOOTING······································11
10. DISASSEMBLY INSTRUCTIONS·····················18
11. PARTS LIST······················································20
12. OPTIONAL PARTS ···········································22
NOTE:
•This manual describes technical data of indoor units.
1
TECHNICAL CHANGES
MSC-GA20VB - ➔ MSC-CB20VB -
MSC-GA25VB - ➔ MSC-CB25VB MSC-GA35VB - ➔ MSC-CB35VB -
1. Panel logo has been changed.
E1E1
E1E1
E1E1
2
2
Emergency operation switch
Fan
Catechin air filter
(With deodorizer)
Air outlet
Vertical vanes
Air inlet
to Breaker
Remote control
receiving section
Display section
Air cleaning filter(option)
(white bellows type)
Front panel
Power supply cord
Panel
Horizontal vane
Operation section
(When the front panel is opened)
Remote controller
Operation indicator lamp
Remote control
receiving section
PART NAMES AND FUNCTIONS
MSC-CB20VB MSC-CB25VB MSC-CB35VB
INDOOR UNIT
3
MSC-CB20VB
Installation plate
Installation plate fixing screw 4 o 25 mm
Remote controller holder
Fixing screw for 3 3.5 o 16 mm
Battery (AAA) for remote controller
Wireless remote controller
Felt tape (Used for left or left-rear piping)
1
5
1
2
2
1
1
<Indoor unit>
1
2
3
4
5
6
7
ON/OFF
FAN
TOO
WARM
TOO
COOL
VANE
MODE
ECONO COOL
STOP
START
HR.
MIN.
I FEEL
COOL
DRY
PM
CLOCK
AM
RESET
CLOCK
HEAT
/FAN
/
Open the front lid.
ON/OFF
TOO
COOL
PM
AM
TOO
WARM
Signal transmitting section
Operation display section
OPERATE /STOP
(ON /OFF) button
TEMPERATURE buttons
Indication of remote controller model is
on back.
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 CONTROL button
CLOCK SET button
MSC-CB25VB
MSC-CB35VB
ACCESSORIES
REMOTE CONTROLLER
4
3
Indoor model
Function
Indoor unit 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
Remote controller model
K/h
A
A
W
%
A
"
mm
kg
dB
rpm
MSC-CB20VB
Single phase
230V,50Hz
10
0.17
35
90
0.17
RC4V19-JA
WHT-BLK 283
BLK-RED 188
815O278O244
9
5
3
KP1A
Cooling
474/372/276
36/31/25
900/750/600
Heating
510/420/342
36/31/25
950/820/700
MSC-CB25VB
Single phase
230V,50Hz
10
0.17
35
90
0.17
RC4V19-JA
WHT-BLK 283
BLK-RED 188
815O278O244
9
5
3
KP1A
Cooling
474/384/306
36/31/25
900/770/650
Heating
588/456/342
39/32/25
1,050/870/700
MSC-CB35VB
Single phase
230V,50Hz
10
0.19
40
92
0.19
RC4V19-HA
WHT-BLK 224
BLK-RED 318
815O278O244
10
5
3
KP1A
Cooling
582/444/324
40/33/26
930/760/600
Heating
606/498/396
39/33/26
960/830/700
Electrical
data
Fan
motor
Special
remarks
Capacity
NOTE: 1. Test conditions are based on ISO 5151.
SPECIFICATION
Cooling : Indoor DB27°C WB19°C Heating : Indoor DB20°C
Outdoor DB35°C WB24°C Outdoor DB7°C WB6°C
Indoor-Outdoor piping length : 5m
5
4
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
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
Test conditions,
Cooling : DB27: WB19:
Heating : DB20: WB -:
MSC-CB20VB
COOLING
High
FUNCTIONFAN SPEED
36
HEATING
SPL(dB
(A)) LINE
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
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
Test conditions.
Cooling : DB27: WB19:
Heating : DB20: WB -:
MSC-CB25VB
COOLING
High
FUNCTIONFAN SPEED
36
HEATING 39
SPL(dB
(A)) LINE
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
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
Test conditions.
Cooling : DB27: WB19:
Heating : DB20: WB -:
MSC-CB35VB
COOLING
FUNCTIONFAN SPEED
40
HEATING
High
39
SPL(dB
(A)) LINE
INDOORUNIT
WALL
MICROPHONE
0.8m
1m
NOISE CRITERIA CURVES
6
5
OUTLINES AND DIMENSIONS
MSC-CB20VB
MSC-CB25VB
INDOOR UNIT
278
60
58
162
Wireless remote controller
606
783
815
Installation plate
Indoor unit
149
19
Power supply cord
Lead to right 1.0m
Lead to left 0.3m
81.5
41
81.5
Air in
30
Air out
242 5
7 or more
244
326326
Installation plate
{
90
110
133.5
4.5
271
231.5
42
2.5
81.5
Wall hole
Liquid line
Gas line
Insulation
Drain hose
(Connected part O,D)
Insulation
[65
[6.35-0.5m
[9.52-0.43m
[37 O.D
[21 I.D
[16
[28
Unit: mm
MSC-CB35VB
INDOOR UNIT
278
60
58
162
Wireless remote controller
606
783
815
Installation plate
Indoor unit
149
19
Power supply cord
Lead to right 1.0m
Lead to left 0.3m
41
Air in
30
Air out
7
242
7 or more
244
161.5161.5
326326
5
Installation plate
{
90
110
81.581.5
Wall hole
Liquid line [6.35-0.5m
Gas line
Insulation
Drain hose
(Connected part O,D)
Insulation
17.5
258
218.5
42
2.5
[65
[9.52-0.43m
[37 O.D
[21 I.D
[16
[28
6
SYMBOL
NR11
RT11
RT12
SR141
NAME
NAME NAME
INDOOR FAN CAPACITOR
FUSE(T3.15AL250V)
INDOOR FAN MOTOR (INNER FUSE)
VANE MOTOR
VARISTOR
ROOM TEMPERATURE THERMIST OR
INDOOR COIL THERMISTOR
SOLID STATE RELAY
TERMINAL BLOCK
SYMBOL
C11
F11
MF
MV
SYMBOL
TB
T11
TRANSFORMER
MF
1
2
3
4
5
6
125
CNCN
109
5
REMOTE
CONTROLLER
23
POWER MONITOR
RECEIVER P.C.BOARD
GRN
LD103
PE
12V
FOR
MU OR
MUX TYPE
FOR MUH OR
MXZ-A TYPE
MV
GRN/YLW
POWER
SUPPLY
CORD
~/N 230V
50Hz
TO OUTDOOR
UNIT
CONNECTING
12V
1
2
N
3
L
BRN
BLU
BLK
WHT
BLU
RED
BRN
5
CN
151
1
2
CN202
1
2
3
CN201
LD105
CN211
ELECTRONIC CONTROL P.C. BOARD
F11
T11
NR11
RT11
RT12
CN
112
CN
111
5
3
1
CN
121
BLK
GRY
YLW
BRN
3
WHT
RED
C11
SR141
CIRCUIT BREAKER
TB
WIRING DIAGRAM
MSC-CB20VB MSC-CB25VB MSC-CB35VB
INDOOR UNIT
NOTE: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.
/: Terminal block, : Connector
7
REFRIGERANT SYSTEM DIAGRAM
MSC-CB20VB MSC-CB25VB MSC-CB35VB
INDOOR UNIT
Indoor
heat
exchanger
Room temperature
thermistor
RT11
Refrigerant flow
in cooling
Refrigerant pipe [9.52
(with heat insulator)
Indoor coil
thermistor
RT12
Flared connection
Flared connection
Refrigerant pipe [6.35
(with heat insulator)
8
Unit:mm
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