SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
INDOOR UNIT
SERVICE MANUAL
Wireless type
Models
No. OB440
MSH-CB50VB -
MSH-CB50VB
E1
Outdoor unit service manual
MUH-GA·VB Series (OB368)
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················2
3. SPECIFICATION·················································4
4. NOISE CRITERIA CURVES·······························4
5. OUTLINES AND DIMENSIONS·························5
6. WIRING DIAGRAM ············································6
7. REFRIGERANT SYSTEM DIAGRAM················6
8. SERVICE FUNCTIONS ······································7
9. TROUBLESHOOTING·········································9
10. DISASSEMBLY INSTRUCTIONS·····················17
11. PARTS LIST······················································19
12. OPTIONAL PARTS ···········································21
NOTE:
This service manual describes technical data of the indoor unit.
1
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
Front panel
1
2
3
4
5
6
7
Installation plate
Installation plate fixing screw 4 o 25 mm
Remote controller holder
Fixing screw for 3 o 3.5 o 1.6 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
MSH-CB50VB
TECHNICAL CHANGES
MSH-GA50VB -
1. Panel logo has been changed.
2
PART NAMES AND FUNCTIONS
➔MSH-CB50VB -
INDOOR UNIT
MSH-CB50VB
E1E1
ACCESSORIES
Indoor unit
2
REMOTE CONTROLLER
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
HEAT
DRY
PM
CLOCK
AM
RESET CLOCK
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.
MSH-CB50VB
3
3
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
Heating : Dry-bulb temperature 20: Wet-bulb temperature 15.5:
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
Indoor model
Function
Power supply
Air flow
(High/Med./Low)
Power outlet
Running current
Power input
Auxiliary heater
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(kW)
%
A
"
mm
kg
dB
rpm
MSH-CB50VB
Single phase
230V, 50Hz
768/642/528
10
0.3
60
—
87
0.30
RC4V32-AA
WHT-BLK 293
BLK-RED 146
1,100O325O258
16
5
42/38/34
1,070/920/780
3
KP0A
Cooling
Heating
Electrical
data
Fan
motor
Special
remarks
Capacity
INDOORUNIT
WALL
MICROPHONE
0.8m
1m
SPECIFICATION
NOTE: Test conditions are based on ISO 5151.
Cooling : Indoor DB27°C WB19°C Heating : Indoor DB20°C WB 15.5°C
Outdoor DB35°C WB(24°C) Outdoor DB 7°C WB 6°C
Indoor-Outdoor piping length : 5m
4
NOISE CRITERIA CURVES
MSH-CB50VB
4
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
Power supply cord
Lead to right 2.0m
Lead to left 1.0m
OUTLINES AND DIMENSIONS
MSH-CB50VB
INDOOR UNIT
Unit: mm
5
6
WIRING DIAGRAM
MSH-CB50VB
INDOOR UNIT
TO OUTDOOR
UNIT
CONNECTING
12V
POWER
SUPPLY
CORD
~/N 230V
50Hz
PE
CIRCUIT
BREAKER
SYMBOL
C11
F11
HIC1
NOTES:
INDOOR FAN CAPACITOR
FUSE (T3.15AL250V)
DC/DC CONVERTER
MF
INDOOR FAN MOTOR (INNER FUSE)
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.
TB
3
N
L
BRN
BLU
: Terminal block
RED
BLU
BRN
GRN/YLW
NAME
MV2
: Connector
CN
151
15
MV2
SYMBOL
MV1
MV1
MV2
NR11
RT11
CN201
3
2
1
TAB12
CN
102
CN
101
3
DISPLAY
P.C.BOARD
NAME
VANE MOTOR (HORIZONTAL)
VANE MOTOR (VERTICAL)
VARISTOR
ROOM TEMPERATURE THERMISTOR
HIC1
F11
SR141
ELECTRONIC CONTROL
P.C. BOARD
3
RECEIVER
P.C.BOARD
REMOTE
CONTROLLER
SYMBOL
NR11
RT12
SR141
TB
C11
2
1
CN112
CN
121
1
3
4
CN211
CN
111
3
RT12
BLK
GRY
YLW
BRN
WHT
RED
RT11
NAME
INDOOR COIL THERMISTOR
SOLID STATE RELAY
TERMINAL BLOCK
1
2
3
MF
4
5
6
7
REFRIGERANT SYSTEM DIAGRAM
MSH-CB50VB
INDOOR UNIT
Indoor
heat
exchanger
Indoor coil
thermistor
RT12
Room temperature
thermistor
RT11
Distributor
Unit:mm
Refrigerant pipe [12.7
(with heat insulator)
Flared connection
Flared connection
Refrigerant pipe [6.35
(with heat insulator)
6
Refrigerant flow in cooling
Refrigerant flow in heating
8
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
SERVICE FUNCTIONS
MSH-CB50VB
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.)
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 :
Remote controller model : KP0A
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.
J2
J1
NOTE : For remodelling, take out the bat-
teries and press the
OPERATE/STOP(ON/OFF)button
twice or 3 times at first.
After finish remodelling, put back
the batteries then press the
RESET button.
Table 1
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 will 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.
8-3. AUTO RESTART FUNCTION
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 FEELCONTROL” mode before power failure, the operation is not memorized. In “I FEEL CONTROL” mode, the operation is decided
by the initial room temperature.
7
How to release “AUTO RESTART FUNCTION”
JR07
IC152
CN151
CN112
CN111
CN121
SW1
IC101
RA102
C11
CN201
CN211
TAB12
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.)
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.
8
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