Mitsubishi Electric MS-GH13VA User manual

Models
MS-GH13VA -KU1 ,KU2 ,KU2 U
MS-GH18VA -KU1 ,KU2 ,KU2 U
MS-GH24VA -KU1
MS-GH30VA -KU1
CONTENTS
1. TECHNICAL CHANGES ······························2
2. PART NAMES AND FUNCTIONS··················3
3. SPECIFICATION ········································5
4. OUTLINES AND DIMENSIONS·····················6
5. WIRING DIAGRAM·····································7
6. REFRIGERANT SYSTEM DIAGRAM ·············9
7. SERVICE FUNCTIONS······························ 10
8. MICROPROCESSOR CONTROL ················ 12
9. TROUBLESHOOTING······························· 19
10. DISASSEMBLY INSTRUCTIONS················· 33
Outdoor unit service manual
MU-GH∙VA Series (OBH665)
INDOOR UNIT
PARTS CATALOG (OBB664)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
TM
SERVICE MANUAL
No. OBH664
REVISED EDITION-B
OBH664 REVISED EDITION-A is void.
Revision B:
•MS-GH13/18VA- KU2 Uhave been
added.

2
MS-GH13VA - KU1
MS-GH18VA - KU1
MS-GH24VA - KU1
MS-GH30VA - KU1
1. New model
MS-GH13VA- KU1 MS-GH13VA- KU2
MS-GH18VA- KU1 MS-GH18VA- KU2
1. The model name has been changed so as to correspond to standard.
2. Remote controller has been changed.
MS-GH13VA- KU2 MS-GH13VA- KU2 U
MS-GH18VA- KU2 MS-GH18VA- KU2 U
1. The model name has been changed so as to correspond to standard.
2. Remote controller has been changed. (The setting temperature range has been changed.)
TECHNICAL CHANGES
1
Use the specified refrigerant only
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.
Correct refrigerant is specified 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.
Revision A:
•MS-GH13/18VA- KU2 have been added.
Revision B:
•MS-GH13/18VA- KU2 Uhave been added.
OBH664B

3
ACCESSORIES
PART NAMES AND FUNCTIONS
2
Model MS-GH13VA
Installation plate 1
Installation plate fixing screw 4 × 25 mm 5
Remote controller holder 1
Fixing screw for 3.5 × 16 mm (Black) 2
Battery (AAA) for remote controller 2
Wireless remote controller 1
Felt tape (For left or left-rear piping) 1
MS-GH13VA
Air filter
(Nano platinum filter)
Front panel
Air cleaning filter
(Electrostatic anti-allergy
enzyme filter, option)
Operation indicator lamp
Remote control receiving section
Emergency operation switch (E.O. SW)
Horizontal vane
Air outlet Heat exchanger
Display section
Air inlet
Remote controller
OBH664B

4
ACCESSORIES
MS-GH18VA MS-GH24VA MS-GH30VA
Horizontal vane
Air outlet
Air filter
(Nano platinum filter)
Air inlet
Front panel
Air cleaning filter
(Electrostatic anti-allergy
enzyme filter, option)
Remote controller
Display section
Heat exchanger
Operation indicator lamp
Remote control receiving section
Emergency operation switch
(E.O.SW)
Model MS-GH18VA MS-GH24VA
MS-GH30VA
Installation plate 1
Installation plate fixing screw 4 × 25 mm 7
Remote controller holder 1
Fixing screw for 3.5 × 16 mm (Black) 2
Battery (AAA) for remote controller 2
Wireless remote controller 1
Felt tape (For left or left-rear piping) 1
OBH664B

5
SPECIFICATION
3
Indoor model MS-GH13VA MS-GH18VA MS-GH24VA MS-GH30VA
Function Cooling
Power supply Single phase 220 - 230 - 240 V, 50 Hz
Electrical
data
Running current A 0.22 0.30 0.42
Power input W 43 39 51
Fan motor
Model RC4V18-FA RC0J56-AF
Current A 0.22 0.30 0.42
Dimensions W × H × D mm 798 x 295 x 232 1,100 x 325 x 238
Weight kg 916
Special remarks
Air direction 5
Airflow
Super High (POWERFUL)
m3/h
624 1,086 1,086 1,206
High 558 870 990 1,122
Med. 396 762 834 1,014
Low 288 642 714 882
Sound level
Super High (POWERFUL)
dB (A)
44 45 48 50
High 40 42 45 47
Med. 33 38 41 43
Low 26 34 37 39
Fan speed
Super High (POWERFUL)
rpm
1,100 1,100 1,100 1,200
High 1,000 920 1,020 1,130
Med. 770 800 890 1,040
Low 610 720 790 930
Fan speed regulator 4
Remote controller model
KU1 : KM12A KU1 : KM12B
KM12B
KU2 : KM15D KU2 : KM16A
KU2 U: KM17A KU2 U: KM17C
NOTE: Test conditions are based on ISO 5151.
Cooling: Indoor Dry-bulb temperature 27 Wet-bulb temperature 19
Outdoor Dry-bulb temperature 35 Wet-bulb temperature 24
Indoor-Outdoor piping length: 5 m
OBH664B

6
Unit: mm
OUTLINES AND DIMENSIONS
4
211.5
231.5
253
21.5
155 155
80
80 225 225
3
5232
56
69
798
785 6.5
130619
50
295
50
42
56
43
42
8
100
107
112
45
56
69
33861
212.5
254
41
42
315 84
11×26 Oblong hole 11×20 Oblong hole
Installation plate
Indoor unit
Wall hole ø65
Air in
Air out
Installation plate
Piping
Drain hose
159
19
58
MS-GH13VA
Piping
Insulation ø35 O.D
Liquid line ø7 - 0.5 m (Flared connection ø6.35)
Gas line ø9.52 - 0.43 m (Flared connection: ø9.52)
Drain hose Insulation ø28 O.D Connected part ø16 O.D
Unit: mm
1090 5
1100
45 238.5
258.5
3
280
225 225
129
239.5
281
44
49.5 500.5 439.5
199.5199.5 110.5
65
63 76 843 181
65
65 30
63
65
67
63
325
3
100
125
160
110
( 70° )
238
5
210
21.5
184
12
Piping
Insulation Ø 50 O.D
Liquid line
Ø 9.52 - 0.5m (Flared connection Ø 6.35)
Gas line
Ø 12 - 0.43m (Flared connection Ø 15.88)
Drain hose Inslation
Ø 28 Connected part Ø 16 O.D
Piping
Insulation Ø 50 O.D
Liquid line
Ø 9.52 - 0.5m (Flared connection Ø 6.35)
Gas line
Ø 12 - 0.45m (Flared connection Ø 12.7)
Drain hose Inslation
Ø 28 Connected part Ø 16 O.D
Air out
Piping
Drain hose
11×26 Oblong hole 11×20 Oblong hole
Installation plate
Indoor unit
Wall hole Ø 75
Air in Installation plate
MS-GH18VA
MS-GH24VA
159
19
58
Piping
Insulation Ø 50 O.D
Liquid line
Ø 9.52 - 0.5m (Flared connection Ø 9.52)
Gas line
Ø 12 - 0.43m (Flared connection Ø 15.88)
Drain hose Inslation
Ø 28 Connected part Ø 16 O.D
MS-GH30VA
MS-GH18VA MS-GH24VA MS-GH30VA
OBH664B

7
WIRING DIAGRAM
5
MS-GH13VA- KU1
MS-GH13VA- KU2 ,KU2 U
OBH664B

8
MS-GH18VA- KU1 MS-GH24VA MS-GH30VA
MS-GH18VA- KU2 ,KU2 U
OBH664B

9
Unit: mm
REFRIGERANT SYSTEM DIAGRAM
6
MS-GH13VA
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe 6.35
(with heat insulator)
Indoor coil
thermistor
RT12
Refrigerant flow in cooling
Refrigerant pipe 9.52
(with heat insulator)
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe ø12.7 (MS-GH18VA)
ø15.88 (MS-GH24/30VA)
(with heat insulator)
Refrigerant pipe ø6.35 (MS-GH18/24VA)
ø9.52 (MS-GH30VA)
(with heat insulator)
Indoor coil
thermistor
RT12
Refrigerant flow in cooling
MS-GH18VA MS-GH24VA MS-GH30VA
OBH664B

10
7-1. TIMER SHORT MODE
For service, the following set time can be shortened by bridging JPG and JPS on the electronic control P.C. board.
(Refer to 9-7.)
Set time: 3 minutes 3 seconds (It takes 3 minutes for the compressor to start operation. However, the starting time is
shortened by bridging JPG and JPS.)
7-2. 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)
(MS-GH13/18/24/30VA- KU1 )/
STOP/OPERATE (OFF/ON)
(MS-GH13/18VA- KU2 ,KU2
U)button
2 or 3 times at first.
After modification, put back
the batteries then press the
RESET button.
J2
J1
Table 1
1 unit operation 2 units operation 3 units operation 4 units operation
No. 1 unit No modification Same as at left Same as at left Same as at left
No. 2 unit — Solder J1 Same as at left Same as at left
No. 3 unit — — Solder J2 Same as at left
No. 4 unit — — — 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 will only accept 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 is turned OFF, or the power supply is shut down.
Please conduct the above setting once again after the power has been restored.
SERVICE FUNCTIONS
7
MS-GH13VA MS-GH18VA MS-GH24VA MS-GH30VA
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.
OBH664B