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Revision A: |
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•RoHS PARTS LIST has been corrected. |
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS |
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||||||||||||||||||||||||||||||
Please void OB367 REVISED EDITION-A. |
|||||||||||||||||||||||||||||||
INDOOR UNIT
SERVICE MANUAL
No. OB367
REVISED EDITION-B
Wireless type
Models
MSH-GA50VB - E1
MSH-GA60VB - E1
MSH-GA80VB - 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 ·······························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
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).
Revision A:
•RoHS PARTS LIST has been added.
Revision B:
•RoHS PARTS LIST has been corrected.
1 
TECHNICAL CHANGES
MSH-A18WV - E1 MSH-GA50VB - E1
MSH-A24WV - E1 MSH-GA60VB - E1
MSH-A30WV - E1 MSH-GA80VB - E1
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)
2 
PART NAMES AND FUNCTIONS
MSH-GA50VB MSH-GA60VB MSH-GA80VB
Air cleaning filter (option) |
Grille |
|
(White bellows type) |
||
|
Air inlet
To breaker Front panel 
Power supply cord
Catechin air filter
Remote control receiving section
Vertical vanes
Horizontal vane
Remote controller
Operation section |
Display section |
(When the grille is opened) |
Operation indicator lamp |
|
Emergency operation switch
Remote control receiving section
ACCESSORIES
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MSH-GA50VB |
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|
MSH-GA60VB |
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|
MSH-GA80VB |
1 |
Installation plate |
1 |
2 |
Installation plate fixing screw 4 o 25 mm |
7 |
3 |
Remote controller holder |
1 |
4 |
Fixing screw for 3 o 3.5 o 1.6 mm (Black) |
2 |
5 |
Battery (AAA) for remote controller |
2 |
6 |
Wireless remote controller |
1 |
7 |
Felt tape (Used for left or left-rear piping) |
1 |
2
REMOTE CONTROLLER
MSH-GA50VB
MSH-GA60VB
MSH-GA80VB
Signal transmitting section
Operation display section
OPERATE /STOP (ON /OFF)button
Open the front lid. |
VANE button (Horizontal vane button)
OPERATION SELECT button
ECONO COOL button
WIDE VANE button (Vertical vane button)
RESET button
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PM |
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AM |
ON/OFF |
TOO |
TOO |
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WARM |
COOL |
TEMPERATURE buttons
Indication of remote controller model is on back.
AM |
ON/OFF |
TOO |
TOO |
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WARM |
COOL |
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FAN |
STOP |
FAN SPEED CONTROL button |
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I FEEL COOL |
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OFF-TIMER button |
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VANE |
START |
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HEAT DRY |
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ON-TIMER button |
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MODE |
WIDE VANE |
HR. |
HR. button |
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ECONO COOL |
LONG |
MIN. |
MIN. button |
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(TIME SET button) |
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RESET CLOCK |
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CLOCK SET button |
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LONG button |
3
3 SPECIFICATION
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Indoor model |
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Function |
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Power supply |
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Capacity Air flow(High/Med./Low) |
K /h |
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Electrical |
data |
Power outlet |
A |
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Running current |
A |
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Power input |
W |
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Power factor |
% |
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Fan motor current |
A |
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Fan |
motor |
Model |
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Winding |
" |
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resistance(at 20:) |
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Dimensions WOHOD |
mm |
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Weight |
kg |
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Air direction |
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Special |
remarks |
Sound level(High/Med./Low) |
dB |
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Fan speed(High/Med./Low) |
rpm |
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Fan speed regulator |
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Thermistor RT11(at 25:) |
k" |
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Thermistor RT12(at 25:) |
k" |
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Remote controller model |
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MSH-GA50VB |
MSH-GA60VB |
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Cooling |
Heating |
Cooling |
Heating |
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Single phase |
Single phase |
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230V, 50Hz |
230V, 50Hz |
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768/642/528 |
768/672/588 |
768/642/528 |
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10 |
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10 |
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0.3 |
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0.3 |
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60 |
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60 |
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87 |
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87 |
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0.30 |
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0.30 |
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RC4V32-AA |
RC4V32-AA |
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WHT-BLK 293 |
WHT-BLK 293 |
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BLK-RED 146 |
BLK-RED 146 |
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1,100O325O258 |
1,100O325O258 |
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16 |
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16 |
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5 |
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5 |
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42/38/34 |
45/41/37 |
45/40/34 |
1,070/920/780 |
1,070/960/850 |
1,070/920/780 |
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3 |
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3 |
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10 |
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10 |
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10 |
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10 |
KP0A, KM04A |
KP0A, KM04A |
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Indoor model
Function
Power supply
Capacity Air flow(High/Med./Low) |
K /h |
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Electrical data |
Power outlet |
A |
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Running current |
A |
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Power input |
W |
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Power factor |
% |
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Fan motor current |
A |
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Fan motor |
Model |
" |
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Winding |
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resistance(at 20:) |
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Dimensions WOHOD |
mm |
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Weight |
kg |
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Air direction |
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Sound level(High/Med./Low) |
dB |
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Special remarks |
Fan speed(High/Med./Low) |
rpm |
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Thermistor RT11(at 25:) |
k" |
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Fan speed regulator |
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Thermistor RT12(at 25:) |
k" |
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Thermistor RT13(at 25:) |
k" |
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Remote controller model |
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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
|
MSH-GA80VB |
Cooling |
Heating |
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Single phase |
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230V, 50Hz |
960/822/684 |
960/834/732 |
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10 |
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0.34 |
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69 |
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88 |
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0.34 |
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RC4V40-AA |
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WHT-BLK 138.2 |
BLK-RED 159.0 |
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1,100O325O258 |
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16 |
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5 |
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47/42/37 |
1,310/1,130/970 |
1,310/1,150/1,020 |
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3 |
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10 |
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10 |
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10 |
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KP0A, KM04A |
Heating : Indoor DB20°C |
WB 15.5°C |
Outdoor DB 7°C WB 6°C
4
4 
NOISE CRITERIA CURVES
MSH-GA50VB MSH-GA60VB
FAN SPEED SPL(dB(A)) |
LINE |
High 42
FAN SPEED SPL(dB(A)) |
LINE |
High 45
Test conditions, |
Test conditions, |
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19: |
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19: |
Heating : Dry-bulb temperature 20: Wet-bulb temperature 15.5: |
Heating : Dry-bulb temperature 20: Wet-bulb temperature 15.5: |
BAR |
90 |
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BAR |
90 |
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MICRO |
80 |
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MICRO |
80 |
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0.0002 |
70 |
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NC-70 |
0.0002 |
70 |
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NC-70 |
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dB re |
60 |
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dB re |
60 |
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LEVEL, |
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LEVEL, |
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NC-60 |
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NC-60 |
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50 |
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PRESSURE |
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PRESSURE |
50 |
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NC-50 |
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NC-50 |
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40 |
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40 |
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NC-40 |
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NC-40 |
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SOUND |
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SOUND |
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30 |
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30 |
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BAND |
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NC-30 |
BAND |
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NC-30 |
20 |
APPROXIMATE |
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20 |
APPROXIMATE |
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OCTAVE |
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OCTAVE |
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THRESHOLD OF |
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THRESHOLD OF |
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HEARING FOR |
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NC-20 |
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HEARING FOR |
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NC-20 |
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CONTINUOUS |
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CONTINUOUS |
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10 |
NOISE |
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10 |
NOISE |
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63 |
125 |
250 |
500 |
1000 |
2000 |
4000 |
8000 |
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63 |
125 |
250 |
500 |
1000 |
2000 |
4000 |
8000 |
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BAND CENTER FREQUENCIES, Hz |
BAND CENTER FREQUENCIES, Hz |
MSH-GA80VB
FAN SPEED SPL(dB(A)) |
LINE |
High 47
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19: Heating : Dry-bulb temperature 20: Wet-bulb temperature 15.5:
BAR |
90 |
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MICRO |
80 |
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0.0002 |
70 |
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NC-70 |
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dB re |
60 |
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LEVEL, |
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NC-60 |
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50 |
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PRESSURE |
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NC-50 |
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40 |
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NC-40 |
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SOUND |
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30 |
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BAND |
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NC-30 |
20 |
APPROXIMATE |
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OCTAVE |
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THRESHOLD OF |
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HEARING FOR |
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NC-20 |
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CONTINUOUS |
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10 |
NOISE |
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63 |
125 |
250 |
500 |
1000 |
2000 |
4000 |
8000 |
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BAND CENTER FREQUENCIES, Hz
INDOOR UNIT
WALL
1m
0.8m
MICROPHONE
5
5 
OUTLINES AND DIMENSIONS
MSH-GA50VB
MSH-GA60VB
MSH-GA80VB
1068
1100
325
56 |
791 |
58 |
19 |
162 |
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Wireless remote controller
Unit: mm
Installation plate |
Indoor unit |
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98 |
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173 |
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7.5 |
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255.5 |
315 |
47 |
414.5 |
414.5 |
2.5 |
47 |
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98 |
173 |
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Wall hole [75
Air in
253
Air out
258 5
{Liquid line [ 6.35- 0.5m
Installation plate Gas line [ 12-0.43m Insulation [ 50 O.D
[ 32 I.D for MSH-GA50/60VB
{Liquid line [ 9.52- 0.5m Gas line [ 12-0.43m Insulation [ 50 O.D
[ 32 I.D for MSH-GA80VB
Drain hose [16 (Connected part O.D)
Insulation [28
Power supply cord Lead to right 2.0m Lead to left 1.0m
6
6 
WIRING DIAGRAM
MSH-GA50VB
MSH-GA60VB
TO OUTDOOR UNIT CONNECTING
12V
POWER SUPPLY CORD ~/N 230V 50Hz
PE
CIRCUIT
BREAKER
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HIC1 |
2 |
RT12 |
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1 |
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TB |
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3 |
RED |
CN201 |
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CN112 |
BLK |
1 |
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3 |
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NR11 |
CN 3 |
GRY |
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2 |
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2 |
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121 |
YLW |
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N |
BLU |
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3 |
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MF |
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1 |
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BRN |
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C11 |
1 |
4 |
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L |
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BRN |
TAB12 |
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F11 SR141 |
3 |
WHT |
5 |
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4 |
RED |
6 |
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CN |
CN |
CN ELECTRONIC CONTROLCN211 |
RT11 |
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151 |
102 |
101 |
P.C. BOARD |
CN |
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BRN |
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111 |
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15 |
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BLU |
3 |
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3 |
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GRN/YLW |
MV2 MV2 MV1 |
DISPLAY |
RECEIVER |
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P.C.BOARD |
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REMOTE |
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P.C.BOARD |
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CONTROLLER
SYMBOL |
NAME |
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SYMBOL |
NAME |
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SYMBOL |
NAME |
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C11 |
INDOOR FAN CAPACITOR |
MV1 |
VANE MOTOR (HORIZONTAL) |
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RT12 |
INDOOR COIL THERMISTOR |
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F11 |
FUSE (3.15A) |
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MV2 |
VANE MOTOR (VERTICAL) |
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SR141 |
SOLID STATE RELAY |
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HIC1 |
DC/DC CONVERTER |
NR11 |
VARISTOR |
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TB |
TERMINAL BLOCK |
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MF |
INDOOR FAN MOTOR (INNER FUSE) |
RT11 |
ROOM TEMPERATURE THERMISTOR |
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NOTES: 1.About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing. |
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2.Use copper conductors only. (For field wiring) |
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3.Symbols below indicate. |
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: Terminal block |
: Connector |
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MSH-GA80VB
TO OUTDOOR UNIT CONNECTING
12V
POWER SUPPLY CORD ~/N 230V 50Hz
PE
CIRCUIT
BREAKER
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4 |
RT13 |
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3 |
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HIC1 |
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2 |
RT12 |
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1 |
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TB |
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3 |
RED |
CN201 |
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CN112 |
BLK |
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3 |
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NR11 |
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CN 3 |
GRY |
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N |
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2 |
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121 |
YLW |
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BLU |
1 |
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C11 |
1 |
BRN MF |
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WHT |
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L |
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BRN |
TAB12 |
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F11 SR141 |
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3 |
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RED |
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4 |
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CN |
CN |
CN ELECTRONIC CONTROL |
CN211 |
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151 |
102 |
101 |
P.C. BOARD |
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CN |
RT11 |
BRN |
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111 |
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BLU |
15 |
3 |
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3 |
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GRN/YLW |
MV2 MV2 MV1 |
DISPLAY |
RECEIVER |
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P.C.BOARD |
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REMOTE |
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P.C.BOARD |
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CONTROLLER
SYMBOL |
NAME |
SYMBOL |
NAME |
SYMBOL |
NAME |
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C11 |
INDOOR FAN CAPACITOR |
MV2 |
VANE MOTOR(VERTICAL) |
SR141 |
SOLID STATE RELAY |
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F11 |
FUSE(3.15A) |
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NR11 |
VARISTOR |
TB |
TERMINAL BLOCK |
HIC1 |
DC/DC CONVERTER |
RT11 |
ROOM TEMPERATURE THERMISTOR |
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MF |
INDOOR FAN MOTOR(INNER PROTECTOR) |
RT12 |
INDOOR COIL THERMISTOR (MAIN) |
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MV1 |
VANE MOTOR(HORIZONTAL) |
RT13 |
INDOOR COIL THERMISTOR (SUB) |
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NOTES: 1.About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing. |
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2.Use copper conductors only. (For field wiring) |
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3.Symbols below indicate. |
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: Terminal block |
: Connector |
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7 |
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7 
REFRIGERANT SYSTEM DIAGRAM
MSH-GA50VB |
MSH-GA60VB |
Refrigerant pipe [12.7 (with heat insulator)
Unit:mm
Refrigerant pipe [15.88 (with heat insulator)
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Indoor coil |
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Indoor coil |
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Indoor |
Indoor |
thermistor |
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thermistor |
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heat |
RT12 |
heat |
RT12 |
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exchanger |
Distributor |
exchanger |
Distributor |
Flared connection |
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Flared connection |
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Room temperature thermistor
Room temperature
RT11
thermistor RT11
Flared connection |
Flared connection |
Refrigerant pipe [6.35 |
Refrigerant pipe [6.35 |
(with heat insulator) |
(with heat insulator) |
MSH-GA80VB |
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Refrigerant pipe [15.88 |
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(with heat insulator) |
Indoor |
Indoor coil |
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heat |
thermistor |
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exchanger |
RT12(main) |
Flared connection |
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Indoor coil |
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thermistor |
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RT13(sub) |
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Room temperature |
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thermistor |
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RT11 |
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Strainer |
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#50 |
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Flared connection |
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Refrigerant pipe [9.52 |
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(with heat insulator) |
Refrigerant flow in cooling 
Refrigerant flow in heating
8
8 
SERVICE FUNCTIONS
MSH-GA50VB
MSH-GA60VB
MSH-GA80VB
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 :
NOTE : For modification, take out the batteries 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.
Remote controller model : KM04A |
Remote controller model : KP0A |
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J2 |
J1 |
J2 |
J1 |
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.
Table 1
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1 unit operation |
2 units operation |
3 units operation |
4 units operation |
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No. 1 unit |
No modification |
Same as at left |
Same as at left |
Same as at left |
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No. 2 unit |
– |
Solder J1 |
Same as at left |
Same as at left |
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No. 3 unit |
– |
– |
Solder J2 |
Same as at left |
No. 4 unit |
– |
– |
– |
Solder both J1 and J2 |
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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.
9
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