SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
No. OB387
HFC
utilized
R410A
SERVICE MANUAL
Wireless type
Models
E1
MUH-GA20VB -
MUH-GA25VB -
MUH-GA35VB -
E1
E1
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················6
3. SPECIFICATION·················································6
4. NOISE CRITERIA CURVES·······························7
5. OUTLINES AND DIMENSIONS ·························8
6. WIRING DIAGRAM ············································9
7. REFRIGERANT SYSTEM DIAGRAM··············10
8. PERFORMANCE CURVES ······························11
9. SERVICE FUNCTIONS ····································22
10. TROUBLESHOOTING······································22
11. DISASSEMBLY INSTRUCTIONS·····················29
12. PARTS LIST······················································32
Indication of
model name
E1
E1
E1
MUH-GA20VB -
MUH-GA25VB -
MUH-GA35VB -
NOTE:
•This manual describes technical data of outdoor units.
E1
•As for indoor units MSC-GA20/GA25/GA35VB - , refer to the service manual OB385.
E1
•As for indoor units MSC-CA20/CA25/CA35VB - , refer to the service manual OB393.
INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT
• This room air conditioner adopts HFC refrigerant (R410A) which never destroys the ozone layer.
• Pay particular attention to the following points, though the basic installation procedure is same as that for R22 conditioners.
1As R410A has working pressure approximate 1.6 times as high as that of R22, some special tools and piping parts/
materials are required. Refer to the table below.
2Take sufficient care not to allow water and other contaminations to enter the R410A refrigerant during storage and
installation, since it is more susceptible to contaminations than R22.
3For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant
piping.)
4Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent
composition change.
New refrigerant
Previous refrigerant
R22
Refrigerant
R410A
Composition (Ratio)
HFC-32: HFC-125 (50%:50%)
R22 (100%)
Single refrigerant
Included
A1
Refrigerant handling
Pseudo-azeotropic refrigerant
Chlorine
Not included
Safety group (ASHRAE)
A1/A1
Molecular weight
72.6
86.5
Boiling point (:)
-51.4
-40.8
Steam pressure [25:](Mpa)
1.557
0.94
Saturated steam density [25:](Kg/K)
64
44.4
Combustibility
Non combustible
Non combustible
0.055
ODP w1
0
GWP w2
1730
1700
Refrigerant charge method
From liquid phase in cylinder
Gas phase
Possible
Compatible oil
Light yellow
Non
Additional charge on leakage
Possible
Incompatible oil
Non
Kind
Color
Smell
Non
w1:Ozone Destruction Parameter : based on CFC-11
w2 :Global Warmth Parameter
: based on CO2
New Specification
The incompatible refrigeration oil easily separates from
refrigerant and is in the upper layer inside the suction muffler. refrigeration oil goes back to the compressor through the
Current Specification
Since refrigerant and refrigerating oil are compatible each,
Raising position of the oil back hole enables to back the
refrigeration oil of the upper layer to flow back to the
lower position oil back hole.
compressor.
Suction muffler
Suction muffler
Oil back hole
Compressor
Compressor
Refrigeration oil
Oil back hole
Refrigerant
Refrigeration oil /Refrigerant
NOTE : The unit of pressure has been changed to MPa on the international system of units(SI unit system).
The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/f [Gauge])
3
Conversion chart of refrigerant temperature and pressure
(MPa [Gauge])
4.0
3.5
R410A
3.0
R22
2.5
2.0
NOTE : The unit of pressure has been changed to MPa on the
1.5
1.0
0.5
0.0
-0.5
international system of units(SI unit system).
The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/f [Gauge])
-30 -20 -10
0
10 20 30 40 50 60 (:)
1.Tools dedicated for the air conditioner with R410A refrigerant
The following tools are required for R410A refrigerant. Some R22 tools can be substituted for R410A tools.
The diameter of the service port on the stop valve in outdoor unit has been changed to prevent any other refrigerant being
charged into the unit. Cap size has been changed from 7/16 UNF with 20 threads to 1/2 UNF with 20 threads.
Description
R410A tools
Can R22 tools be used?
No
R410A has high pressures beyond the measurement range of existing
gauges. Port diameters have been changed to prevent any other refrigerant
from being charged into the unit.
Gauge manifold
Hose material and cap size have been changed to improve the pressure
resistance.
Charge hose
No
No
Gas leak detector
Dedicated for HFC refrigerant.
Torque wrench
Yes
6.35 mm and 9.52 mm
Flare tool
Yes
Clamp bar hole has been enlarged to reinforce the spring strength in the tool.
Provided for flaring work (to be used with R22 flare tool).
Flare gauge
New
Vacuum pump
adapter
Provided to prevent the back flow of oil. This adapter enables you to use
vacuum pumps.
New
New
It is difficult to measure R410A with a charging cylinder because the
refrigerant bubbles due to high pressure and high-speed vaporization
Electronic scale for
refrigerant charging
No : Not Substitutable for R410A Yes : Substitutable for R410A
2.Refrigerant piping
1Specifications
Use the refrigerant pipes that meet the following specifications.
Outside diameter
Wall
Pipe
Insulation material
mm
6.35
9.52
thickness
0.8 mm
0.8 mm
For liquid
For gas
Heat resisting foam plastic
Specific gravity 0.045 Thickness 8 mm
• Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm. Never use any pipe with a thickness less
than 0.8mm, as the pressure resistance is insufficient.
4
2Flaring work and flare nut
Flaring work for R410A pipe differs from that for R22 pipe.
For details of flaring work, refer to Installation manual “FLARING WORK”.
Dimension of flare nut
Pipe diameter
R410A
mm
6.35
9.52
R22
17
17
22
22
3.Refrigeration oil
Apply the special refrigeration oil (accessories: packed with indoor unit) to the flare and the union seat surfaces.
4.Air purge
• Do not discharge the refrigerant into the atmosphere.
Take care not to discharge refrigerant into the atmosphere during installation, reinstallation, or repairs to the refrigerant
circuit.
• Use the vacuum pump for air purging for the purpose of environmental protection.
5.Additional charge
For additional charging, charge the refrigerant from liquid phase of the gas cylinder.
If the refrigerant is charged from the gas phase, composition change may occur in the refrigerant inside the cylinder and the
outdoor unit. In this case, ability of the refrigeration cycle decreases or normal operation can be impossible. However,
charging the liquid refrigerant all at once may cause the compressor to be locked. Thus, charge the refrigerant slowly.
Union
Stop valve
Indoor unit
Liquid pipe
Outdoor unit
Gas pipe
Refrigerant gas
cylinder
operating valve
Service port
Gauge manifold
valve (for R410A)
Charge hose (for R410A)
Refrigerant gas cylinder
for R410A with siphon
Refrigerant (liquid)
Electronic scale for refrigerant charging
5
2
PART NAMES AND FUNCTIONS
OUTDOOR UNIT
ACCESSORIES
E1
E1
MUH-GA20VB-
MUH-GA25VB-
MUH-GA35VB-
MUH-GA20VB -
MUH-GA25VB -
MUH-GA35VB -
E1
E1
E1
E1
Air inlet
back : MUH-GA20VB
back and side : MUH-GA25VB
MUH-GA35VB
<Outdoor unit: MUH type>
(
)
1
1 Drain socket
Piping
Drain hose
Air outlet
Drain outlet
3
SPECIFICATION
E1
E1
E1
MUH-GA20VB -
MUH-GA25VB -
MUH-GA35VB -
Outdoor model
Single phase
230V,50Hz
Single phase
230V,50Hz
Single phase
230V,50Hz
Outdoor unit power supply
Cooling
2.3
0.9
Heating
2.5
Function
Cooling
2.65
1.1
Heating
3.0
Cooling
3.5
1.7
Heating
3.7
Capacity
kW
R/h
K /h
A
Dehumidification
Outdoor air flow
Power outlet
—
—
—
1800
10
1902
10
1902
10
Running current
Power input
A
W
3.00
680
2.86
655
3.43
785
3.43
785
4.65
1,050
4.34
980
Auxiliary heater
Power factor
Starting current
Compressor motor current
Fan motor current
A(kW)
%
A
A
A
—
21
—
22
—
27
99
100
2.62
3.62
100
3.10
3.23
100
3.10
3.66
98
98
2.76
4.32
4.01
0.25
0.33
0.33
3.22
Coefficient of performance (C.O.P)
Model
3.21
3.63
RN092VHSHT
600
RN135VHSHT
900
RN104VHSHT
700
Output
W
Winding
resistance (at 20:)
Model
C-R 3.87
C-S 6.14
RA6V21-AD
WHT-BLK 366
BLK-RED 274
800o550o285
32
C-R 2.79
C-S 3.36
RA6V33-KB
WHT-BLK 215
BLK-RED 307
800o550o285
35
C-R 3.40
C-S 4.56
RA6V33-KB
WHT-BLK 215
BLK-RED 307
800o550o285
32
"
Winding
"
resistance (at 20:)
Dimensions WOHOD
Weight
mm
kg
Sound level
dB
47
49
49
Fan speed
rpm
745
855
855
Fan speed regulator
Refrigerant filling
capacity (R410A)
Refrigeration oil (Model)
Thermistor RT61 (at 0:)
1
1
1
kg
0.65
0.80
0.80
350 (NEO22)
33.18
620 (NEO22)
33.18
350 (NEO22)
33.18
cc
k"
NOTE: Test conditions are based on ISO 5151.
Cooling : Indoor DB27°C WB19°C
Outdoor DB35°C WB24°C
Heating : Indoor
DB20°C
Outdoor DB 7°C/WB 6°C
Indoor-Outdoor piping length : 5m
6
4
NOISE CRITERIA CURVES
SPL(dB(A))
47
LINE
SPL(dB(A))
49
LINE
FUNCTION
COOLING
HEATING
FUNCTION
COOLING
HEATING
MUH-GA25VB- E1
MUH-GA35VB- E1
MUH-GA20VB- E1
Test conditions,
Test conditions,
Cooling :DB35:
Heating :DB 7:
WB24:
WB 6:
Cooling :DB35:
Heating :DB 7:
WB24:
WB 6:
90
80
70
60
50
40
30
90
80
70
60
50
40
30
NC-70
NC-70
NC-60
NC-50
NC-40
NC-30
NC-60
NC-50
NC-40
NC-30
APPROXIMATE
APPROXIMATE
20
20
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-20
NC-20
10
10
63
125
250
500
1000
2000
4000
8000
63
125
250
500
1000
2000
4000
8000
BAND CENTER FREQUENCIES, Hz
BAND CENTER FREQUENCIES, Hz
OUTDOORUNIT
1m
MICROPHONE
7
5
OUTLINES AND DIMENSIONS
E1
E1
E1
Unit: mm
MUH-GA20VB -
MUH-GA25VB -
MUH-GA35VB -
OUTDOOR UNIT
REQUIRED SPACE
Basically open 100mm or more
without any obstruction in front
and on both sides of the unit.
400
Air in
Drain hole [42
Air in
(MUH-GA25
/GA35VB)
Open two sides of left,
right, or rear side.
40
2 holes 10X21
Service panel
Air out
23
22.3
Liquid refrigerant pipe joint
Refrigerant pipe (flared) [6.35
Handle
Gas refrigerant pipe joint
Refrigerant pipe (flared) [9.52
150
69
170.5
302.5
Service port
500 Bolt pitch for installation
800
8
6
WIRING DIAGRAM
E1
E1
E1
MUH-GA20VB -
MUH-GA25VB -
MUH-GA35VB -
MODELS WIRING DIAGRAM
OUTDOOR UNIT
21S4
RT61
TB2
3
RED
BLK
CN661
CN721
CN711
WHT
BLK
N
CIRCUIT
MF
BREAKER
RED
SR61
BRN
BLU
TB1
L
T61
4
N
TAB20
52C
3
BRN
WHT
PE
C
BLU
RED
BLK
S
MC
R
C1
SYMBOL
NAME
SYMBOL
MF
NAME
SYMBOL
T61
NAME
TRANS FORMER
TERMINAL BLOCK
R.V. COIL
C1
COMPRESSOR CAPACITOR
OUTDOOR FAN CAPACITOR
OUTDOOR FAN MOTOR
(INNER FUSE)
C65
TB1,TB2
21S4
DSAR SURGE ABSORBER
NR61 VARISTOR
F61
MC
FUSE(2A)
RT61 DEFROST THERMISTOR
SR61,SR62 SOLID STATE RELAY
52C
COMPRESSOR CONTACTOR
COMPRESSOR(INNER PROTECTOR)
NOTE:1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.
2. Use copper conductors only. (For field wiring)
3. Symbols below indicate.
/: Terminal block,
: Connector
9
7
REFRIGERANT SYSTEM DIAGRAM
Unit:mm
E1
E1
E1
MUH-GA20VB -
MUH-GA25VB -
MUH-GA35VB -
OUTDOOR UNIT
Refrigerant pipe [ 9.52
4-way valve
(with heat insulator)
Stop valve
(with service
port)
Outdoor
heat
exchanger
Defrost
thermistor
RT61
Flared connection
Muffler
Compressor
Capillary tube
[3.0x[1.4x700 (MUH-GA20VB)
[3.0x[1.4x1000(MUH-GA25VB)
[3.0x[1.4x500 (MUH-GA35VB)
Check valve
Flared connection
R.V. coil
heating ON
cooling OFF
Strainer
#100
Capillary tube
Stop valve
[3.0x[1.4x500 (MUH-GA20VB)
[3.0x[1.4x600 (MUH-GA25VB)
[3.0x[1.4x300 (MUH-GA35VB)
Refrigerant pipe [6.35
(with heat insulator)
Refrigerant flow in cooling
Refrigerant flow in heating
10
MAX. REFRIGERANT PIPING LENGTH
Refrigerant piping
Piping size O.D : mm
Length of connecting pipe : m
Model
Max. length : m
A
Outdoor unit
Gas
Liquid
Indoor unit
MUH-GA20VB - E1
MUH-GA25VB - E1
Gas 0
Gas 0.43
Liquid 0.5
20
9.52
6.35
Liquid 0
MUH-GA35VB - E1
25
MAX. HEIGHT DIFFERENCE
Indoor
unit
Height difference should be within
10m regardless of which unit,
indoor or outdoor position is high.
Refrigerant Piping
Max.length
A
w Max. Height
difference 10m
Outdoor unit
ADDITIONAL REFRIGERANT CHARGE(R410A : g)
Refrigerant piping length (one way)
Model
Outdoor unit precharged
650
7m
10m
15m
20m
25m
MUH-GA20VB - E1
MUH-GA25VB - E1
MUH-GA35VB - E1
0
60
160
260
800
360
Calculation : Xg = 20g/m x (A-7)m
8
PERFORMANCE CURVES
E1
E1
E1
MUH-GA20VB -
MUH-GA25VB -
MUH-GA35VB -
The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions,
since operating conditions vary according to the areas where these units are installed. The following information has been pro-
vided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
(1) GUARANTEED VOLTAGE
198~264V
(2) AIR FLOW
Air flow should be set at MAX.
(3) MAIN READINGS
(1) Indoor intake air wet-bulb temperature :
(2) Indoor outlet air wet-bulb temperature :
(3) Outdoor intake air dry-bulb temperature :
(4) Total input:
(5) Indoor intake air dry-bulb temperature :
(6) Outdoor intake air wet-bulb temperature :
(7) Total input :
°CWB
°CWB
°CDB
W
°CDB
°CWB
W
Cooling
Heating
}
}
Indoor air wet/dry-bulb temperature difference on the left side of the chart on page 10 shows the difference between the
indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service.
11
How to measure the indoor air wet-bulb/dry-bulb temperature difference
1. Attach at least 2 sets of wet-and dry-bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets
of wet-and dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air
speed is high.
2. Attach at least 2 sets of wet-and dry-bulb thermometers to the outdoor air intake.
Cover the thermometers to prevent direct rays of the sun.
3. Check that the air filter is cleaned.
4. Open windows and doors of room.
5. Press the EMERGENCY OPERATION switch once(twice) to start the EMERGENCY COOL
(HEAT) MODE.
6. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.
7. 10 minutes later, measure temperature again and check that the temperature does not change.
INDOOR UNIT
OUTDOOR UNIT
Wet-and dry-bulb
thermometers
Wet-and dry-bulb
thermometers
8-1.CAPACITY AND THE INPUT CURVES
8.5
7.8
7.1
6.4
5.8
5.1
10.011.0
9.2 10.0
8.3 9.1
7.5 8.2
6.8 7.4
6.0 6.5
24.0
22.1
19.2
20.0
18.5
17.8
16.3
14.8
20.3
18.4
16.6
14.7
16.9
15.4
13.9
12.3
13.3
11.8
10.4
8.9
12.9
11.1
10.8
9.2
NOTE:The above curves are for the heating operation without any frost.
12
8-2.OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT
COOL operation
① Both indoor and outdoor unit are under the same temperature/humidity condition.
Relative humidity(%)
Dry-bulb temperature
20
50
60
70
25
30
➁Air flow should be set at MAX.
③ The unit of pressure has been changed to MPa on the international system of units(SI unit system).
The conversion factor is : 1(MPa[Gauge]) =10.2(kgf/f[Gauge] )
E1
E1
(kgf/F[Gauge])(MPa[Gauge])
MUH-GA20VB -
MUH-GA20VB -
4
3
2
1
1.3
1.2
1.1
1.0
0.9
0.8
0.7
13
12
11
10
9
230V
230V
8
7
15
18 20
50
25
60
30 32 35(:)
70(%)
Ambient temperature(˚C)
Ambient humidity(%)
18
32
35(:)
15
20
50
25
60
30
70(%)
Ambient temperature(˚C)
Ambient humidity(%)
E1
(kgf/F[Gauge])(MPa[Gauge])
MUH-GA25VB -
E1
MUH-GA25VB -
1.3
4
13
230V
230V
1.2
12
1.1
11
3
2
1
1.0
10
0.9
9
0.8
8
0.7
7
15 18 20
50
25
60
30 32 35(:)
70(%)
15
18 20
50
25
60
30 32 35(:)
70(%)
Ambient temperature(˚C)
Ambient humidity(%)
Ambient temperature(˚C)
Ambient humidity(%)
(kgf/F[Gauge])(MPa[Gauge])
E1
MUH-GA35VB -
E1
MUH-GA35VB -
6
5
4
3
1.3
1.2
1.1
1.0
0.9
0.8
0.7
13
12
11
10
9
230V
230V
8
7
18
32
70(%)
15
20
50
25
60
30
35(:)
15 18 20
50
25
60
30 32
70(%)
35(:)
Ambient temperature(˚C)
Ambient humidity(%)
Ambient temperature(˚C)
Ambient humidity(%)
13
HEAT operation
Condition indoor:Dry bulb temperature 20.0°C
Outdoor:Dry bulb temperature 7,15,20°C
Wet bulb temperature 6,12,14.5°C
Wet bulb temperature 14.5°C
E1
E1
MUH-GA25VB -
MUH-GA20VB -
5
5
4
230V
4
230V
3
3
2
5
2
10
15
20 21
25(:)
7
(:)
25
21
5
7
10
15
20
Ambient temperature(˚C)
Ambient temperature(˚C)
E1
MUH-GA35VB -
6
5
4
3
230V
(:)
25
5
10
15
20 21
7
Ambient temperature(˚C)
14
PERFORMANCE DATA
COOL operation (230V)
E1
E1
MSC-GA20VB -
: MUH-GA20VB -
CAPACITY : 2.3(kW) SHF : 0.74 INPUT : 715(W)
OUTDOOR DB(:)
INDOOR INDOOR
21
25
27
30
DB(:) WB(:)
Q
SHC SHF INPUT
Q
SHC SHF INPUT
Q
SHC SHF INPUT
Q
SHC SHF INPUT
21
21
22
22
22
23
23
23
24
24
24
24
25
25
25
25
26
26
26
26
26
27
27
27
27
27
28
28
28
28
28
29
29
29
29
29
30
30
30
30
30
31
31
31
31
31
32
32
32
32
32
18
20
18
20
22
18
20
22
18
20
22
24
18
20
22
24
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
2.70 1.51 0.56 572 2.59 1.45 0.56 601 2.48 1.39 0.56 629 2.39 1.34 0.56 658
2.82 1.24 0.44 601 2.70 1.19 0.44 636 2.62 1.15 0.44 651 2.53 1.11 0.44 679
2.70 1.62 0.60 572 2.59 1.55 0.60 601 2.48 1.49 0.60 629 2.39 1.44 0.60 658
2.82 1.35 0.48 601 2.70 1.30 0.48 636 2.62 1.26 0.48 651 2.53 1.21 0.48 679
2.93 1.06 0.36 622 2.83 1.02 0.36 661 2.76 0.99 0.36 679 2.65 0.95 0.36 708
2.70 1.73 0.64 572 2.59 1.66 0.64 601 2.48 1.59 0.64 629 2.39 1.53 0.64 658
2.82 1.47 0.52 601 2.70 1.41 0.52 636 2.62 1.36 0.52 651 2.53 1.32 0.52 679
2.93 1.17 0.40 622 2.83 1.13 0.40 661 2.76 1.10 0.40 679 2.65 1.06 0.40 708
2.70 1.84 0.68 572 2.59 1.76 0.68 601 2.48 1.69 0.68 629 2.39 1.63 0.68 658
2.82 1.58 0.56 601 2.70 1.51 0.56 636 2.62 1.47 0.56 651 2.53 1.42 0.56 679
2.93 1.29 0.44 622 2.83 1.24 0.44 661 2.76 1.21 0.44 679 2.65 1.16 0.44 708
3.08 0.99 0.32 651 2.97 0.95 0.32 686 2.90 0.93 0.32 708 2.81 0.90 0.32 744
2.70 1.95 0.72 572 2.59 1.86 0.72 601 2.48 1.79 0.72 629 2.39 1.72 0.72 658
2.82 1.69 0.60 601 2.70 1.62 0.60 636 2.62 1.57 0.60 651 2.53 1.52 0.60 679
2.93 1.41 0.48 622 2.83 1.36 0.48 661 2.76 1.32 0.48 679 2.65 1.27 0.48 708
3.08 1.11 0.36 651 2.97 1.07 0.36 686 2.90 1.04 0.36 708 2.81 1.01 0.36 744
2.70 2.05 0.76 572 2.59 1.97 0.76 601 2.48 1.89 0.76 629 2.39 1.82 0.76 658
2.82 1.80 0.64 601 2.70 1.73 0.64 636 2.62 1.68 0.64 651 2.53 1.62 0.64 679
2.93 1.52 0.52 622 2.83 1.47 0.52 661 2.76 1.44 0.52 679 2.65 1.38 0.52 708
3.08 1.23 0.40 651 2.97 1.19 0.40 686 2.90 1.16 0.40 708 2.81 1.12 0.40 744
3.17 0.89 0.28 686 3.08 0.86 0.28 722 3.04 0.85 0.28 744 2.94 0.82 0.28 765
2.70 2.16 0.80 572 2.59 2.07 0.80 601 2.48 1.99 0.80 629 2.39 1.91 0.80 658
2.82 1.92 0.68 601 2.70 1.84 0.68 636 2.62 1.78 0.68 651 2.53 1.72 0.68 679
2.93 1.64 0.56 622 2.83 1.58 0.56 661 2.76 1.55 0.56 679 2.65 1.48 0.56 708
3.08 1.36 0.44 651 2.97 1.31 0.44 686 2.90 1.28 0.44 708 2.81 1.23 0.44 744
3.17 1.02 0.32 686 3.08 0.99 0.32 722 3.04 0.97 0.32 744 2.94 0.94 0.32 765
2.70 2.27 0.84 572 2.59 2.17 0.84 601 2.48 2.09 0.84 629 2.39 2.01 0.84 658
2.82 2.03 0.72 601 2.70 1.95 0.72 636 2.62 1.89 0.72 651 2.53 1.82 0.72 679
2.93 1.76 0.60 622 2.83 1.70 0.60 661 2.76 1.66 0.60 679 2.65 1.59 0.60 708
3.08 1.48 0.48 651 2.97 1.42 0.48 686 2.90 1.39 0.48 708 2.81 1.35 0.48 744
3.17 1.14 0.36 686 3.08 1.11 0.36 722 3.04 1.09 0.36 744 2.94 1.06 0.36 765
2.70 2.38 0.88 572 2.59 2.28 0.88 601 2.48 2.19 0.88 629 2.39 2.10 0.88 658
2.82 2.14 0.76 601 2.70 2.05 0.76 636 2.62 1.99 0.76 651 2.53 1.92 0.76 679
2.93 1.88 0.64 622 2.83 1.81 0.64 661 2.76 1.77 0.64 679 2.65 1.69 0.64 708
3.08 1.60 0.52 651 2.97 1.54 0.52 686 2.90 1.51 0.52 708 2.81 1.46 0.52 744
3.17 1.27 0.40 686 3.08 1.23 0.40 722 3.04 1.21 0.40 744 2.94 1.18 0.40 765
2.70 2.49 0.92 572 2.59 2.38 0.92 601 2.48 2.29 0.92 629 2.39 2.20 0.92 658
2.82 2.25 0.80 601 2.70 2.16 0.80 636 2.62 2.10 0.80 651 2.53 2.02 0.80 679
2.93 1.99 0.68 622 2.83 1.92 0.68 661 2.76 1.88 0.68 679 2.65 1.80 0.68 708
3.08 1.73 0.56 651 2.97 1.66 0.56 686 2.90 1.62 0.56 708 2.81 1.57 0.56 744
3.17 1.40 0.44 686 3.08 1.36 0.44 722 3.04 1.34 0.44 744 2.94 1.30 0.44 765
2.70 2.59 0.96 572 2.59 2.48 0.96 601 2.48 2.38 0.96 629 2.39 2.30 0.96 658
2.82 2.37 0.84 601 2.70 2.27 0.84 636 2.62 2.20 0.84 651 2.53 2.13 0.84 679
2.93 2.11 0.72 622 2.83 2.04 0.72 661 2.76 1.99 0.72 679 2.65 1.90 0.72 708
3.08 1.85 0.60 651 2.97 1.78 0.60 686 2.90 1.74 0.60 708 2.81 1.68 0.60 744
3.17 1.52 0.48 686 3.08 1.48 0.48 722 3.04 1.46 0.48 744 2.94 1.41 0.48 765
2.70 2.70 1.00 572 2.59 2.59 1.00 601 2.48 2.48 1.00 629 2.39 2.39 1.00 658
2.82 2.48 0.88 601 2.70 2.38 0.88 636 2.62 2.31 0.88 651 2.53 2.23 0.88 679
2.93 2.23 0.76 622 2.83 2.15 0.76 661 2.76 2.10 0.76 679 2.65 2.01 0.76 708
3.08 1.97 0.64 651 2.97 1.90 0.64 686 2.90 1.85 0.64 708 2.81 1.80 0.64 744
3.17 1.65 0.52 686 3.08 1.60 0.52 722 3.04 1.58 0.52 744 2.94 1.53 0.52 765
NOTE
Q :Total capacity (kW)
SHC :Sensible heat capacity (kW)
SHF :Sensible heat factor
INPUT :Total power input (W)
DB :Dry-bulb temperature
WB :Wet-bulb temperature
15
PERFORMANCE DATA
COOL operation (230V)
E1
E1
MSC-GA20VB -
: MUH-GA20VB -
CAPACITY : 2.3(kW) SHF : 0.74 INPUT : 715(W)
OUTDOOR DB(:)
INDOOR INDOOR
35
40
43
DB(:) WB(:)
Q
SHC SHF INPUT
Q
SHC SHF INPUT
Q
SHC SHF INPUT
21
21
22
22
22
23
23
23
24
24
24
24
25
25
25
25
26
26
26
26
26
27
27
27
27
27
28
28
28
28
28
29
29
29
29
29
30
30
30
30
30
31
31
31
31
31
32
32
32
32
32
NOTE
18
20
18
20
22
18
20
22
18
20
22
24
18
20
22
24
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
2.25 1.26 0.56 701 2.07 1.16 0.56 744 1.99 1.11 0.56 758
2.37 1.04 0.44 729 2.21 0.97 0.44 765 2.13 0.94 0.44 787
2.25 1.35 0.60 701 2.07 1.24 0.60 744 1.99 1.19 0.60 758
2.37 1.14 0.48 729 2.21 1.06 0.48 765 2.13 1.02 0.48 787
2.51 0.90 0.36 758 2.35 0.84 0.36 801 2.27 0.82 0.36 815
2.25 1.44 0.64 701 2.07 1.32 0.64 744 1.99 1.27 0.64 758
2.37 1.23 0.52 729 2.21 1.15 0.52 765 2.13 1.11 0.52 787
2.51 1.00 0.40 758 2.35 0.94 0.40 801 2.27 0.91 0.40 815
2.25 1.53 0.68 701 2.07 1.41 0.68 744 1.99 1.35 0.68 758
2.37 1.33 0.56 729 2.21 1.24 0.56 765 2.13 1.19 0.56 787
2.51 1.10 0.44 758 2.35 1.03 0.44 801 2.27 1.00 0.44 815
2.65 0.85 0.32 787 2.48 0.79 0.32 822 2.42 0.77 0.32 840
2.25 1.62 0.72 701 2.07 1.49 0.72 744 1.99 1.43 0.72 758
2.37 1.42 0.60 729 2.21 1.32 0.60 765 2.13 1.28 0.60 787
2.51 1.20 0.48 758 2.35 1.13 0.48 801 2.27 1.09 0.48 815
2.65 0.95 0.36 787 2.48 0.89 0.36 822 2.42 0.87 0.36 840
2.25 1.71 0.76 701 2.07 1.57 0.76 744 1.99 1.51 0.76 758
2.37 1.52 0.64 729 2.21 1.41 0.64 765 2.13 1.36 0.64 787
2.51 1.30 0.52 758 2.35 1.22 0.52 801 2.27 1.18 0.52 815
2.65 1.06 0.40 787 2.48 0.99 0.40 822 2.42 0.97 0.40 840
2.78 0.78 0.28 815 2.62 0.73 0.28 851 2.54 0.71 0.28 869
2.25 1.80 0.80 701 2.07 1.66 0.80 744 1.99 1.59 0.80 758
2.37 1.61 0.68 729 2.21 1.50 0.68 765 2.13 1.45 0.68 787
2.51 1.40 0.56 758 2.35 1.31 0.56 801 2.27 1.27 0.56 815
2.65 1.16 0.44 787 2.48 1.09 0.44 822 2.42 1.06 0.44 840
2.78 0.89 0.32 815 2.62 0.84 0.32 851 2.54 0.81 0.32 869
2.25 1.89 0.84 701 2.07 1.74 0.84 744 1.99 1.67 0.84 758
2.37 1.71 0.72 729 2.21 1.59 0.72 765 2.13 1.53 0.72 787
2.51 1.50 0.60 758 2.35 1.41 0.60 801 2.27 1.36 0.60 815
2.65 1.27 0.48 787 2.48 1.19 0.48 822 2.42 1.16 0.48 840
2.78 1.00 0.36 815 2.62 0.94 0.36 851 2.54 0.91 0.36 869
2.25 1.98 0.88 701 2.07 1.82 0.88 744 1.99 1.75 0.88 758
2.37 1.80 0.76 729 2.21 1.68 0.76 765 2.13 1.62 0.76 787
2.51 1.60 0.64 758 2.35 1.50 0.64 801 2.27 1.45 0.64 815
2.65 1.38 0.52 787 2.48 1.29 0.52 822 2.42 1.26 0.52 840
2.78 1.11 0.40 815 2.62 1.05 0.40 851 2.54 1.02 0.40 869
2.25 2.07 0.92 701 2.07 1.90 0.92 744 1.99 1.83 0.92 758
2.37 1.90 0.80 729 2.21 1.77 0.80 765 2.13 1.70 0.80 787
2.51 1.70 0.68 758 2.35 1.60 0.68 801 2.27 1.54 0.68 815
2.65 1.48 0.56 787 2.48 1.39 0.56 822 2.42 1.35 0.56 840
2.78 1.22 0.44 815 2.62 1.15 0.44 851 2.54 1.12 0.44 869
2.25 2.16 0.96 701 2.07 1.99 0.96 744 1.99 1.91 0.96 758
2.37 1.99 0.84 729 2.21 1.85 0.84 765 2.13 1.79 0.84 787
2.51 1.81 0.72 758 2.35 1.69 0.72 801 2.27 1.63 0.72 815
2.65 1.59 0.60 787 2.48 1.49 0.60 822 2.42 1.45 0.60 840
2.78 1.34 0.48 815 2.62 1.26 0.48 851 2.54 1.22 0.48 869
2.25 2.25 1.00 701 2.07 2.07 1.00 744 1.99 1.99 1.00 758
2.37 2.08 0.88 729 2.21 1.94 0.88 765 2.13 1.87 0.88 787
2.51 1.91 0.76 758 2.35 1.78 0.76 801 2.27 1.72 0.76 815
2.65 1.69 0.64 787 2.48 1.59 0.64 822 2.42 1.55 0.64 840
2.78 1.45 0.52 815 2.62 1.36 0.52 851 2.54 1.32 0.52 869
Q :Total capacity (kW)
SHC :Sensible heat capacity (kW)
SHF :Sensible heat factor
DB :Dry-bulb temperature
WB :Wet-bulb temperature
INPUT :Total power input (W)
16
PERFORMANCE DATA
COOL operation (230V)
E1
E1
MSC-GA25VB -
: MUH-GA25VB -
CAPACITY : 2.65(kW) SHF : 0.70 INPUT : 820(W)
OUTDOOR DB(:)
INDOOR INDOOR
DB(:) WB(:)
21
25
SHC SHF INPUT
27
30
Q
SHC SHF INPUT
Q
Q
SHC SHF INPUT
Q
SHC SHF INPUT
21
21
22
22
22
23
23
23
24
24
24
24
25
25
25
25
26
26
26
26
26
27
27
27
27
27
28
28
28
28
28
29
29
29
29
29
30
30
30
30
30
31
31
31
31
31
32
32
32
32
32
NOTE
18
20
18
20
22
18
20
22
18
20
22
24
18
20
22
24
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
3.11 1.62 0.52 656 2.98 1.55 0.52 689 2.86 1.49 0.52 722 2.76 1.43 0.52 754
3.25 1.30 0.40 689 3.11 1.25 0.40 730 3.02 1.21 0.40 746 2.92 1.17 0.40 779
3.11 1.74 0.56 656 2.98 1.67 0.56 689 2.86 1.60 0.56 722 2.76 1.54 0.56 754
3.25 1.43 0.44 689 3.11 1.37 0.44 730 3.02 1.33 0.44 746 2.92 1.28 0.44 779
3.38 1.08 0.32 713 3.26 1.04 0.32 759 3.18 1.02 0.32 779 3.05 0.98 0.32 812
3.11 1.87 0.60 656 2.98 1.79 0.60 689 2.86 1.72 0.60 722 2.76 1.65 0.60 754
3.25 1.56 0.48 689 3.11 1.49 0.48 730 3.02 1.45 0.48 746 2.92 1.40 0.48 779
3.38 1.22 0.36 713 3.26 1.17 0.36 759 3.18 1.14 0.36 779 3.05 1.10 0.36 812
3.11 1.99 0.64 656 2.98 1.91 0.64 689 2.86 1.83 0.64 722 2.76 1.76 0.64 754
3.25 1.69 0.52 689 3.11 1.62 0.52 730 3.02 1.57 0.52 746 2.92 1.52 0.52 779
3.38 1.35 0.40 713 3.26 1.30 0.40 759 3.18 1.27 0.40 779 3.05 1.22 0.40 812
3.55 0.99 0.28 746 3.42 0.96 0.28 787 3.34 0.93 0.28 812 3.23 0.91 0.28 853
3.11 2.12 0.68 656 2.98 2.03 0.68 689 2.86 1.95 0.68 722 2.76 1.87 0.68 754
3.25 1.82 0.56 689 3.11 1.74 0.56 730 3.02 1.69 0.56 746 2.92 1.63 0.56 779
3.38 1.49 0.44 713 3.26 1.43 0.44 759 3.18 1.40 0.44 779 3.05 1.34 0.44 812
3.55 1.14 0.32 746 3.42 1.09 0.32 787 3.34 1.07 0.32 812 3.23 1.03 0.32 853
3.11 2.24 0.72 656 2.98 2.15 0.72 689 2.86 2.06 0.72 722 2.76 1.98 0.72 754
3.25 1.95 0.60 689 3.11 1.87 0.60 730 3.02 1.81 0.60 746 2.92 1.75 0.60 779
3.38 1.62 0.48 713 3.26 1.56 0.48 759 3.18 1.53 0.48 779 3.05 1.46 0.48 812
3.55 1.28 0.36 746 3.42 1.23 0.36 787 3.34 1.20 0.36 812 3.23 1.16 0.36 853
3.66 0.88 0.24 787 3.55 0.85 0.24 828 3.50 0.84 0.24 853 3.39 0.81 0.24 877
3.11 2.37 0.76 656 2.98 2.27 0.76 689 2.86 2.18 0.76 722 2.76 2.09 0.76 754
3.25 2.08 0.64 689 3.11 1.99 0.64 730 3.02 1.93 0.64 746 2.92 1.87 0.64 779
3.38 1.76 0.52 713 3.26 1.69 0.52 759 3.18 1.65 0.52 779 3.05 1.58 0.52 812
3.55 1.42 0.40 746 3.42 1.37 0.40 787 3.34 1.34 0.40 812 3.23 1.29 0.40 853
3.66 1.02 0.28 787 3.55 0.99 0.28 828 3.50 0.98 0.28 853 3.39 0.95 0.28 877
3.11 2.49 0.80 656 2.98 2.39 0.80 689 2.86 2.29 0.80 722 2.76 2.20 0.80 754
3.25 2.21 0.68 689 3.11 2.12 0.68 730 3.02 2.05 0.68 746 2.92 1.98 0.68 779
3.38 1.89 0.56 713 3.26 1.83 0.56 759 3.18 1.78 0.56 779 3.05 1.71 0.56 812
3.55 1.56 0.44 746 3.42 1.50 0.44 787 3.34 1.47 0.44 812 3.23 1.42 0.44 853
3.66 1.17 0.32 787 3.55 1.14 0.32 828 3.50 1.12 0.32 853 3.39 1.09 0.32 877
3.11 2.62 0.84 656 2.98 2.50 0.84 689 2.86 2.40 0.84 722 2.76 2.32 0.84 754
3.25 2.34 0.72 689 3.11 2.24 0.72 730 3.02 2.18 0.72 746 2.92 2.10 0.72 779
3.38 2.03 0.60 713 3.26 1.96 0.60 759 3.18 1.91 0.60 779 3.05 1.83 0.60 812
3.55 1.70 0.48 746 3.42 1.64 0.48 787 3.34 1.60 0.48 812 3.23 1.55 0.48 853
3.66 1.32 0.36 787 3.55 1.28 0.36 828 3.50 1.26 0.36 853 3.39 1.22 0.36 877
3.11 2.74 0.88 656 2.98 2.62 0.88 689 2.86 2.52 0.88 722 2.76 2.43 0.88 754
3.25 2.47 0.76 689 3.11 2.37 0.76 730 3.02 2.30 0.76 746 2.92 2.22 0.76 779
3.38 2.16 0.64 713 3.26 2.09 0.64 759 3.18 2.04 0.64 779 3.05 1.95 0.64 812
3.55 1.85 0.52 746 3.42 1.78 0.52 787 3.34 1.74 0.52 812 3.23 1.68 0.52 853
3.66 1.46 0.40 787 3.55 1.42 0.40 828 3.50 1.40 0.40 853 3.39 1.36 0.40 877
3.11 2.86 0.92 656 2.98 2.74 0.92 689 2.86 2.63 0.92 722 2.76 2.54 0.92 754
3.25 2.60 0.80 689 3.11 2.49 0.80 730 3.02 2.42 0.80 746 2.92 2.33 0.80 779
3.38 2.30 0.68 713 3.26 2.22 0.68 759 3.18 2.16 0.68 779 3.05 2.07 0.68 812
3.55 1.99 0.56 746 3.42 1.91 0.56 787 3.34 1.87 0.56 812 3.23 1.81 0.56 853
3.66 1.61 0.44 787 3.55 1.56 0.44 828 3.50 1.54 0.44 853 3.39 1.49 0.44 877
3.11 2.99 0.96 656 2.98 2.86 0.96 689 2.86 2.75 0.96 722 2.76 2.65 0.96 754
3.25 2.73 0.84 689 3.11 2.62 0.84 730 3.02 2.54 0.84 746 2.92 2.45 0.84 779
3.38 2.43 0.72 713 3.26 2.35 0.72 759 3.18 2.29 0.72 779 3.05 2.19 0.72 812
3.55 2.13 0.60 746 3.42 2.05 0.60 787 3.34 2.00 0.60 812 3.23 1.94 0.60 853
3.66 1.76 0.48 787 3.55 1.70 0.48 828 3.50 1.68 0.48 853 3.39 1.63 0.48 877
Q :Total capacity (kW)
SHC :Sensible heat capacity (kW)
SHF :Sensible heat factor
DB :Dry-bulb temperature
WB :Wet-bulb temperature
INPUT :Total power input (W)
17
PERFORMANCE DATA
COOL operation (230V)
E1
E1
MSC-GA25VB -
: MUH-GA25VB -
CAPACITY : 2.65(kW) SHF : 0.70 INPUT : 820(W)
OUTDOOR DB(:)
40
INDOOR INDOOR
35
43
DB(:) WB(:)
Q
SHC SHF INPUT
Q
SHC SHF INPUT
Q
SHC SHF INPUT
21
21
22
22
22
23
23
23
24
24
24
24
25
25
25
25
26
26
26
26
26
27
27
27
27
27
28
28
28
28
28
29
29
29
29
29
30
30
30
30
30
31
31
31
31
31
32
32
32
32
32
NOTE
18
20
18
20
22
18
20
22
18
20
22
24
18
20
22
24
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
2.60 1.35 0.52 804 2.39 1.24 0.52 853 2.29 1.19 0.52 869
2.73 1.09 0.40 836 2.54 1.02 0.40 877 2.45 0.98 0.40 902
2.60 1.45 0.56 804 2.39 1.34 0.56 853 2.29 1.28 0.56 869
2.73 1.20 0.44 836 2.54 1.12 0.44 877 2.45 1.08 0.44 902
2.89 0.92 0.32 869 2.70 0.86 0.32 918 2.61 0.84 0.32 935
2.60 1.56 0.60 804 2.39 1.43 0.60 853 2.29 1.38 0.60 869
2.73 1.31 0.48 836 2.54 1.22 0.48 877 2.45 1.18 0.48 902
2.89 1.04 0.36 869 2.70 0.97 0.36 918 2.61 0.94 0.36 935
2.60 1.66 0.64 804 2.39 1.53 0.64 853 2.29 1.47 0.64 869
2.73 1.42 0.52 836 2.54 1.32 0.52 877 2.45 1.27 0.52 902
2.89 1.16 0.40 869 2.70 1.08 0.40 918 2.61 1.04 0.40 935
3.05 0.85 0.28 902 2.86 0.80 0.28 943 2.78 0.78 0.28 964
2.60 1.77 0.68 804 2.39 1.62 0.68 853 2.29 1.56 0.68 869
2.73 1.53 0.56 836 2.54 1.42 0.56 877 2.45 1.37 0.56 902
2.89 1.27 0.44 869 2.70 1.19 0.44 918 2.61 1.15 0.44 935
3.05 0.98 0.32 902 2.86 0.92 0.32 943 2.78 0.89 0.32 964
2.60 1.87 0.72 804 2.39 1.72 0.72 853 2.29 1.65 0.72 869
2.73 1.64 0.60 836 2.54 1.53 0.60 877 2.45 1.47 0.60 902
2.89 1.39 0.48 869 2.70 1.30 0.48 918 2.61 1.25 0.48 935
3.05 1.10 0.36 902 2.86 1.03 0.36 943 2.78 1.00 0.36 964
3.21 0.77 0.24 935 3.02 0.73 0.24 976 2.93 0.70 0.24 996
2.60 1.97 0.76 804 2.39 1.81 0.76 853 2.29 1.74 0.76 869
2.73 1.75 0.64 836 2.54 1.63 0.64 877 2.45 1.57 0.64 902
2.89 1.50 0.52 869 2.70 1.41 0.52 918 2.61 1.36 0.52 935
3.05 1.22 0.40 902 2.86 1.14 0.40 943 2.78 1.11 0.40 964
3.21 0.90 0.28 935 3.02 0.85 0.28 976 2.93 0.82 0.28 996
2.60 2.08 0.80 804 2.39 1.91 0.80 853 2.29 1.83 0.80 869
2.73 1.86 0.68 836 2.54 1.73 0.68 877 2.45 1.67 0.68 902
2.89 1.62 0.56 869 2.70 1.51 0.56 918 2.61 1.46 0.56 935
3.05 1.34 0.44 902 2.86 1.26 0.44 943 2.78 1.22 0.44 964
3.21 1.03 0.32 935 3.02 0.97 0.32 976 2.93 0.94 0.32 996
2.60 2.18 0.84 804 2.39 2.00 0.84 853 2.29 1.93 0.84 869
2.73 1.97 0.72 836 2.54 1.83 0.72 877 2.45 1.76 0.72 902
2.89 1.73 0.60 869 2.70 1.62 0.60 918 2.61 1.57 0.60 935
3.05 1.46 0.48 902 2.86 1.37 0.48 943 2.78 1.34 0.48 964
3.21 1.15 0.36 935 3.02 1.09 0.36 976 2.93 1.05 0.36 996
2.60 2.29 0.88 804 2.39 2.10 0.88 853 2.29 2.02 0.88 869
2.73 2.07 0.76 836 2.54 1.93 0.76 877 2.45 1.86 0.76 902
2.89 1.85 0.64 869 2.70 1.73 0.64 918 2.61 1.67 0.64 935
3.05 1.58 0.52 902 2.86 1.49 0.52 943 2.78 1.45 0.52 964
3.21 1.28 0.40 935 3.02 1.21 0.40 976 2.93 1.17 0.40 996
2.60 2.39 0.92 804 2.39 2.19 0.92 853 2.29 2.11 0.92 869
2.73 2.18 0.80 836 2.54 2.04 0.80 877 2.45 1.96 0.80 902
2.89 1.96 0.68 869 2.70 1.84 0.68 918 2.61 1.77 0.68 935
3.05 1.71 0.56 902 2.86 1.60 0.56 943 2.78 1.56 0.56 964
3.21 1.41 0.44 935 3.02 1.33 0.44 976 2.93 1.29 0.44 996
2.60 2.49 0.96 804 2.39 2.29 0.96 853 2.29 2.20 0.96 869
2.73 2.29 0.84 836 2.54 2.14 0.84 877 2.45 2.06 0.84 902
2.89 2.08 0.72 869 2.70 1.95 0.72 918 2.61 1.88 0.72 935
3.05 1.83 0.60 902 2.86 1.72 0.60 943 2.78 1.67 0.60 964
3.21 1.54 0.48 935 3.02 1.45 0.48 976 2.93 1.41 0.48 996
Q :Total capacity (kW)
SHC :Sensible heat capacity (kW)
SHF :Sensible heat factor
DB :Dry-bulb temperature
WB :Wet-bulb temperature
INPUT :Total power input (W)
18
PERFORMANCE DATA
COOL operation (230V)
E1
E1
MSC-GA35VB -
: MUH-GA35VB -
CAPACITY : 3.5(kW) SHF : 0.66 INPUT : 1090(W)
OUTDOOR DB(:)
INDOOR INDOOR
21
25
27
30
DB(:) WB(:)
Q
SHC SHF INPUT
Q
SHC SHF INPUT
Q
SHC SHF INPUT
Q
SHC SHF INPUT
21
21
22
22
22
23
23
23
24
24
24
24
25
25
25
25
26
26
26
26
26
27
27
27
27
27
28
28
28
28
28
29
29
29
29
29
30
30
30
30
30
31
31
31
31
31
32
32
32
32
32
18
20
18
20
22
18
20
22
18
20
22
24
18
20
22
24
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
4.11 1.97 0.48 872 3.94 1.89 0.48 916 3.78 1.81 0.48 959 3.64 1.75 0.48 1003
4.29 1.54 0.36 916 4.11 1.48 0.36 970 3.99 1.44 0.36 992 3.85 1.39 0.36 1036
4.11 2.14 0.52 872 3.94 2.05 0.52 916 3.78 1.97 0.52 959 3.64 1.89 0.52 1003
4.29 1.72 0.40 916 4.11 1.65 0.40 970 3.99 1.60 0.40 992 3.85 1.54 0.40 1036
4.46 1.25 0.28 948 4.31 1.21 0.28 1008 4.20 1.18 0.28 1036 4.03 1.13 0.28 1079
4.11 2.30 0.56 872 3.94 2.21 0.56 916 3.78 2.12 0.56 959 3.64 2.04 0.56 1003
4.29 1.89 0.44 916 4.11 1.81 0.44 970 3.99 1.76 0.44 992 3.85 1.69 0.44 1036
4.46 1.43 0.32 948 4.31 1.38 0.32 1008 4.20 1.34 0.32 1036 4.03 1.29 0.32 1079
4.11 2.47 0.60 872 3.94 2.36 0.60 916 3.78 2.27 0.60 959 3.64 2.18 0.60 1003
4.29 2.06 0.48 916 4.11 1.97 0.48 970 3.99 1.92 0.48 992 3.85 1.85 0.48 1036
4.46 1.61 0.36 948 4.31 1.55 0.36 1008 4.20 1.51 0.36 1036 4.03 1.45 0.36 1079
4.69 1.13 0.24 992 4.52 1.08 0.24 1046 4.41 1.06 0.24 1079 4.27 1.02 0.24 1134
4.11 2.63 0.64 872 3.94 2.52 0.64 916 3.78 2.42 0.64 959 3.64 2.33 0.64 1003
4.29 2.23 0.52 916 4.11 2.14 0.52 970 3.99 2.07 0.52 992 3.85 2.00 0.52 1036
4.46 1.79 0.40 948 4.31 1.72 0.40 1008 4.20 1.68 0.40 1036 4.03 1.61 0.40 1079
4.69 1.31 0.28 992 4.52 1.26 0.28 1046 4.41 1.23 0.28 1079 4.27 1.20 0.28 1134
4.11 2.80 0.68 872 3.94 2.68 0.68 916 3.78 2.57 0.68 959 3.64 2.48 0.68 1003
4.29 2.40 0.56 916 4.11 2.30 0.56 970 3.99 2.23 0.56 992 3.85 2.16 0.56 1036
4.46 1.96 0.44 948 4.31 1.89 0.44 1008 4.20 1.85 0.44 1036 4.03 1.77 0.44 1079
4.69 1.50 0.32 992 4.52 1.44 0.32 1046 4.41 1.41 0.32 1079 4.27 1.37 0.32 1134
4.83 0.97 0.20 1046 4.69 0.94 0.20 1101 4.62 0.92 0.20 1134 4.48 0.90 0.20 1166
4.11 2.96 0.72 872 3.94 2.84 0.72 916 3.78 2.72 0.72 959 3.64 2.62 0.72 1003
4.29 2.57 0.60 916 4.11 2.47 0.60 970 3.99 2.39 0.60 992 3.85 2.31 0.60 1036
4.46 2.14 0.48 948 4.31 2.07 0.48 1008 4.20 2.02 0.48 1036 4.03 1.93 0.48 1079
4.69 1.69 0.36 992 4.52 1.63 0.36 1046 4.41 1.59 0.36 1079 4.27 1.54 0.36 1134
4.83 1.16 0.24 1046 4.69 1.13 0.24 1101 4.62 1.11 0.24 1134 4.48 1.08 0.24 1166
4.11 3.13 0.76 872 3.94 2.99 0.76 916 3.78 2.87 0.76 959 3.64 2.77 0.76 1003
4.29 2.74 0.64 916 4.11 2.63 0.64 970 3.99 2.55 0.64 992 3.85 2.46 0.64 1036
4.46 2.32 0.52 948 4.31 2.24 0.52 1008 4.20 2.18 0.52 1036 4.03 2.09 0.52 1079
4.69 1.88 0.40 992 4.52 1.81 0.40 1046 4.41 1.76 0.40 1079 4.27 1.71 0.40 1134
4.83 1.35 0.28 1046 4.69 1.31 0.28 1101 4.62 1.29 0.28 1134 4.48 1.25 0.28 1166
4.11 3.29 0.80 872 3.94 3.15 0.80 916 3.78 3.02 0.80 959 3.64 2.91 0.80 1003
4.29 2.92 0.68 916 4.11 2.80 0.68 970 3.99 2.71 0.68 992 3.85 2.62 0.68 1036
4.46 2.50 0.56 948 4.31 2.41 0.56 1008 4.20 2.35 0.56 1036 4.03 2.25 0.56 1079
4.69 2.06 0.44 992 4.52 1.99 0.44 1046 4.41 1.94 0.44 1079 4.27 1.88 0.44 1134
4.83 1.55 0.32 1046 4.69 1.50 0.32 1101 4.62 1.48 0.32 1134 4.48 1.43 0.32 1166
4.11 3.45 0.84 872 3.94 3.31 0.84 916 3.78 3.18 0.84 959 3.64 3.06 0.84 1003
4.29 3.09 0.72 916 4.11 2.96 0.72 970 3.99 2.87 0.72 992 3.85 2.77 0.72 1036
4.46 2.68 0.60 948 4.31 2.58 0.60 1008 4.20 2.52 0.60 1036 4.03 2.42 0.60 1079
4.69 2.25 0.48 992 4.52 2.17 0.48 1046 4.41 2.12 0.48 1079 4.27 2.05 0.48 1134
4.83 1.74 0.36 1046 4.69 1.69 0.36 1101 4.62 1.66 0.36 1134 4.48 1.61 0.36 1166
4.11 3.62 0.88 872 3.94 3.47 0.88 916 3.78 3.33 0.88 959 3.64 3.20 0.88 1003
4.29 3.26 0.76 916 4.11 3.13 0.76 970 3.99 3.03 0.76 992 3.85 2.93 0.76 1036
4.46 2.86 0.64 948 4.31 2.76 0.64 1008 4.20 2.69 0.64 1036 4.03 2.58 0.64 1079
4.69 2.44 0.52 992 4.52 2.35 0.52 1046 4.41 2.29 0.52 1079 4.27 2.22 0.52 1134
4.83 1.93 0.40 1046 4.69 1.88 0.40 1101 4.62 1.85 0.40 1134 4.48 1.79 0.40 1166
4.11 3.78 0.92 872 3.94 3.62 0.92 916 3.78 3.48 0.92 959 3.64 3.35 0.92 1003
4.29 3.43 0.80 916 4.11 3.29 0.80 970 3.99 3.19 0.80 992 3.85 3.08 0.80 1036
4.46 3.03 0.68 948 4.31 2.93 0.68 1008 4.20 2.86 0.68 1036 4.03 2.74 0.68 1079
4.69 2.63 0.56 992 4.52 2.53 0.56 1046 4.41 2.47 0.56 1079 4.27 2.39 0.56 1134
4.83 2.13 0.44 1046 4.69 2.06 0.44 1101 4.62 2.03 0.44 1134 4.48 1.97 0.44 1166
NOTE
Q :Total capacity (kW)
SHC :Sensible heat capacity (kW)
SHF :Sensible heat factor
INPUT :Total power input (W)
DB :Dry-bulb temperature
WB :Wet-bulb temperature
19
PERFORMANCE DATA
COOL operation (230V)
E1
E1
MSC-GA35VB -
: MUH-GA35VB -
CAPACITY : 3.5(kW) SHF : 0.66 INPUT : 1090(W)
OUTDOOR DB(:)
INDOOR INDOOR
35
40
43
DB(:) WB(:)
Q
SHC SHF INPUT
Q
SHC SHF INPUT
Q
SHC SHF INPUT
21
21
22
22
22
23
23
23
24
24
24
24
25
25
25
25
26
26
26
26
26
27
27
27
27
27
28
28
28
28
28
29
29
29
29
29
30
30
30
30
30
31
31
31
31
31
32
32
32
32
32
NOTE
18
20
18
20
22
18
20
22
18
20
22
24
18
20
22
24
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
18
20
22
24
26
3.43 1.65 0.48 1068 3.15 1.51 0.48 1134 3.03 1.45 0.48 1155
3.61 1.30 0.36 1112 3.36 1.21 0.36 1166 3.24 1.17 0.36 1199
3.43 1.78 0.52 1068 3.15 1.64 0.52 1134 3.03 1.57 0.52 1155
3.61 1.44 0.40 1112 3.36 1.34 0.40 1166 3.24 1.30 0.40 1199
3.82 1.07 0.28 1155 3.57 1.00 0.28 1221 3.45 0.97 0.28 1243
3.43 1.92 0.56 1068 3.15 1.76 0.56 1134 3.03 1.70 0.56 1155
3.61 1.59 0.44 1112 3.36 1.48 0.44 1166 3.24 1.42 0.44 1199
3.82 1.22 0.32 1155 3.57 1.14 0.32 1221 3.45 1.10 0.32 1243
3.43 2.06 0.60 1068 3.15 1.89 0.60 1134 3.03 1.82 0.60 1155
3.61 1.73 0.48 1112 3.36 1.61 0.48 1166 3.24 1.55 0.48 1199
3.82 1.37 0.36 1155 3.57 1.29 0.36 1221 3.45 1.24 0.36 1243
4.03 0.97 0.24 1199 3.78 0.91 0.24 1254 3.68 0.88 0.24 1281
3.43 2.20 0.64 1068 3.15 2.02 0.64 1134 3.03 1.94 0.64 1155
3.61 1.87 0.52 1112 3.36 1.75 0.52 1166 3.24 1.68 0.52 1199
3.82 1.53 0.40 1155 3.57 1.43 0.40 1221 3.45 1.38 0.40 1243
4.03 1.13 0.28 1199 3.78 1.06 0.28 1254 3.68 1.03 0.28 1281
3.43 2.33 0.68 1068 3.15 2.14 0.68 1134 3.03 2.06 0.68 1155
3.61 2.02 0.56 1112 3.36 1.88 0.56 1166 3.24 1.81 0.56 1199
3.82 1.68 0.44 1155 3.57 1.57 0.44 1221 3.45 1.52 0.44 1243
4.03 1.29 0.32 1199 3.78 1.21 0.32 1254 3.68 1.18 0.32 1281
4.24 0.85 0.20 1243 3.99 0.80 0.20 1297 3.87 0.77 0.20 1324
3.43 2.47 0.72 1068 3.15 2.27 0.72 1134 3.03 2.18 0.72 1155
3.61 2.16 0.60 1112 3.36 2.02 0.60 1166 3.24 1.94 0.60 1199
3.82 1.83 0.48 1155 3.57 1.71 0.48 1221 3.45 1.65 0.48 1243
4.03 1.45 0.36 1199 3.78 1.36 0.36 1254 3.68 1.32 0.36 1281
4.24 1.02 0.24 1243 3.99 0.96 0.24 1297 3.87 0.93 0.24 1324
3.43 2.61 0.76 1068 3.15 2.39 0.76 1134 3.03 2.30 0.76 1155
3.61 2.31 0.64 1112 3.36 2.15 0.64 1166 3.24 2.07 0.64 1199
3.82 1.98 0.52 1155 3.57 1.86 0.52 1221 3.45 1.79 0.52 1243
4.03 1.61 0.40 1199 3.78 1.51 0.40 1254 3.68 1.47 0.40 1281
4.24 1.19 0.28 1243 3.99 1.12 0.28 1297 3.87 1.08 0.28 1324
3.43 2.74 0.80 1068 3.15 2.52 0.80 1134 3.03 2.42 0.80 1155
3.61 2.45 0.68 1112 3.36 2.28 0.68 1166 3.24 2.20 0.68 1199
3.82 2.14 0.56 1155 3.57 2.00 0.56 1221 3.45 1.93 0.56 1243
4.03 1.77 0.44 1199 3.78 1.66 0.44 1254 3.68 1.62 0.44 1281
4.24 1.36 0.32 1243 3.99 1.28 0.32 1297 3.87 1.24 0.32 1324
3.43 2.88 0.84 1068 3.15 2.65 0.84 1134 3.03 2.54 0.84 1155
3.61 2.60 0.72 1112 3.36 2.42 0.72 1166 3.24 2.33 0.72 1199
3.82 2.29 0.60 1155 3.57 2.14 0.60 1221 3.45 2.07 0.60 1243
4.03 1.93 0.48 1199 3.78 1.81 0.48 1254 3.68 1.76 0.48 1281
4.24 1.52 0.36 1243 3.99 1.44 0.36 1297 3.87 1.39 0.36 1324
3.43 3.02 0.88 1068 3.15 2.77 0.88 1134 3.03 2.66 0.88 1155
3.61 2.74 0.76 1112 3.36 2.55 0.76 1166 3.24 2.46 0.76 1199
3.82 2.44 0.64 1155 3.57 2.28 0.64 1221 3.45 2.21 0.64 1243
4.03 2.09 0.52 1199 3.78 1.97 0.52 1254 3.68 1.91 0.52 1281
4.24 1.69 0.40 1243 3.99 1.60 0.40 1297 3.87 1.55 0.40 1324
3.43 3.16 0.92 1068 3.15 2.90 0.92 1134 3.03 2.79 0.92 1155
3.61 2.88 0.80 1112 3.36 2.69 0.80 1166 3.24 2.59 0.80 1199
3.82 2.59 0.68 1155 3.57 2.43 0.68 1221 3.45 2.34 0.68 1243
4.03 2.25 0.56 1199 3.78 2.12 0.56 1254 3.68 2.06 0.56 1281
4.24 1.86 0.44 1243 3.99 1.76 0.44 1297 3.87 1.70 0.44 1324
Q :Total capacity (kW)
SHC :Sensible heat capacity (kW)
SHF :Sensible heat factor
DB :Dry-bulb temperature
WB :Wet-bulb temperature
INPUT :Total power input (W)
20
PERFORMANCE DATA
HEAT operation (230V)
E1
E1
MSC-GA20VB -
: MUH-GA20VB -
CAPACITY : 2.5(kW)
INPUT : 690(W)
OUTDOOR WB(:)
INDOOR
DB(:)
15
-10
INPUT
1.58 449 1.90 538
1.50 483 1.80 573
1.35 518 1.68 607
-5
INPUT
0
5
10
INPUT
2.88 697 3.18 718
2.75 718 3.05 738
2.63 752 2.93 773
15
INPUT
20
INPUT
3.50 731
3.36 766
3.25 794
Q
Q
Q
INPUT
Q
INPUT
Q
Q
Q
2.23 607 2.55 656
2.13 635 2.43 683
1.98 669 2.30 718
21
26
E1
E1
MSC-GA25VB -
: MUH-GA25VB -
CAPACITY : 3.0(kW)
INPUT : 820(W)
OUTDOOR WB(:)
INDOOR
DB(:)
15
-10
INPUT
1.89 533 2.28 640
1.80 574 2.16 681
1.62 615 2.01 722
-5
INPUT
0
5
10
INPUT
3.45 828 3.81 853
3.30 853 3.66 877
3.15 894 3.51 918
15
INPUT
20
INPUT
4.20 869
4.04 910
3.90 943
Q
Q
Q
INPUT
Q
INPUT
Q
Q
Q
2.67 722 3.06 779
2.55 754 2.91 812
2.37 795 2.76 853
21
26
E1
E1
MSC-GA35VB -
: MUH-GA35VB -
INPUT : 1020(W)
CAPACITY : 3.7(kW)
OUTDOOR WB(:)
INDOOR
DB(:)
15
-10
INPUT
2.33 663 2.81 796
2.22 714 2.66 847
2.00 765 2.48 898
-5
INPUT
0
5
10
INPUT
4.26 1030 4.70 1061 5.18 1081
15
INPUT
20
INPUT
Q
Q
Q
INPUT
3.29 898 3.77 969
3.15 938 3.59 1010 4.07 1061 4.51 1091 4.98 1132
2.92 989 3.40 1061 3.89 1112 4.33 1142 4.81 1173
Q
INPUT
Q
Q
Q
21
26
NOTE Q:Total capacity (kW) INPUT:Total power input (W) DB:Dry-bulb temperature WB:Wet-bulb temperature
21
9
SERVICE FUNCTIONS
E1
MUH-GA20VB -
MUH-GA25VB -
MUH-GA35VB -
E1
E1
9-1. COMPULSORY DEFROSTING MODE FOR SERVICE
By short circuit of the connector JPDS and JPSG on the outdoor deicer P.C. board, defrosting mode can be accom-
plished regardless of the defrost interval restriction. (Refer to 10-5.)
Defrost thermistor RT61 must read below -3°C.
9-2. CHANGE IN DEFROST SETTING
<JRF> When the JRF wire of the deicer P.C. board is cut, the defrost interval time will be changed.
<JRG> When the JRG wire of the deicer P.C. board is cut, the defrost temperature will be changed.(Refer to 10-5.)
MODEL
Jumper wire
JRF
Change point
E1
E1
E1
MUH-GA20VB -
MUH-GA25VB -
MUH-GA35VB -
Defrost interval time changes from 40 minutes to 15 minutes.
JRG
Deforst start temperature changes from -3: to 0:.
10
TROUBLESHOOTING
E1
MUH-GA20VB -
MUH-GA25VB -
MUH-GA35VB -
E1
E1
10-1. Cautions on troubleshooting
1. Before troubleshooting, check the following:
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for mis-wiring.
2. Take care the following during servicing.
1) Before servicing the air conditioner, be sure to turn off the main unit first with the remote controller, and then after con-
firming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic
control P.C. board.
3) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the
components.
4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
Housing point
Lead wiring
3. Troubleshooting procedure
1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.
To make sure, check how many times the abnormality indication is flashing on and off before starting service work.
2) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the
components for bursting and discoloration.
3) When troubleshooting, refer to 10-2. “Instruction of troubleshooting”.
22
10-2. Instruction of troubleshooting
E1
MUH-GA20VB -
MUH-GA25VB -
MUH-GA35VB -
E1
E1
Start
Indoor unit
operates.
Outdoor unit
doesn't operate
normally.
OPERATION
INDICATOR
lamp on the
indoor unit is
flashing on
and off.
Indoor unit
operates.
Outdoor unit
doesn't
Indoor unit
doesn't receive
the signal from
remote controller.
operate.
Indoor unit
doesn't operate,
when the
EMERGENCY
OPERATION
switch is
Outdoor unit
operates in
only Test Run
operation.
Outdoor unit
doesn't
operate
even in
Test Run
operation.
Outdoor unit
doesn't
stop even
if indoor unit
stops.
Unit doesn't
operate
normal
operation in
COOL or
HEAT mode.
Indoor unit
operates,
when the
EMERGENCY
OPERATION
switch is
pressed.
pressed.
As for indoor unit
MSC type,
refer to service
manual OB385
or OB393.
1. Check indoor /
outdoor
connecting wire.
2. Refer to
"Check of indoor
electronic control
P.C. board".
Check room
temperature
thermistor.
Refer to 10-5
"Test point
diagram and
voltage".
Refer to 10-4.
C"Check of
R.V. coil".
Refer to
"Check of
remote
controller
and receiver
P.C. board".
Refer to 10-4.
A"Check of
outdoor unit".
Refer to 10-4.
B"Check of
outdoor unit".
Flash on and off at
0.5-second intervals
Cause:
Indoor/Outdoor unit
• Mis-wiring or
trouble of serial
signal
2-time flash
Cause:
4-time flash
Cause:
Indoor unit
• Trouble of
indoor unit
control
3-time flash
Cause:
Indoor unit
• Trouble of
indoor fan
motor
6-time flash
Cause:
7-time flash
Cause:
Outdoor unit
• Trouble of
outdoor
Indoor unit
• Trouble of
room temp-
erature/
indoor coil
thermistor
Outdoor unit
• Trouble of
thermistor
in outdoor
unit
control
system
system
Check room
temperature
thermistor
and indoor
coil thermis-
tor.
Refer to 10-5
"Test point
diagram and
voltage".
Replace the
indoor
electronic
control
Refer to
"Check of
indoor fan
motor".
Refer to 10-4. D
"How to check
mis-wiring and
serial signal
error (When
outdoor unit
doesn't work)".
W1
Refer to 10-4. Replace the
E"Check of
outdoor
deicer
P.C. board.
thermistor".
P.C. board.
W1.<The case of the trouble of the serial signal>
When the power is turned off and then turned on again, the indication shows “the trouble of mis-wiring”.
23
10-3. Trouble criterion of main parts
E1
E1
E1
MUH-GA20VB -
MUH-GA25VB -
MUH-GA35VB -
Figure
Part name
Check method and criterion
Measure the resistance with a tester.
(Part temperature –10°C ~ 40°C)
Normal
Defrost
thermistor
(RT63)
Abnormal
Open or short-circuit
5kΩ ~ 60kΩ
Compressor
(MC)
Measure the resistance between the terminals with a tester.
(Coil wiring temperature –10°C ~ 40°C)
WHT
C
INNER
P
PROTECTOR
MUH-GA20/GA25VB
150i 5°C OPEN
90i10°C CLOSE
MUH-GA35VB
155i 5°C OPEN
90i10°C CLOSE
Normal
AUX. MAIN
Abnormal
MUH-GA20VB
MUH-GA35VB
MUH-GA25VB
2.99~3.67Ω
4.02~4.92Ω
S
R
BLK
RED
C-R 3.41~4.18Ω
2.46~3.01Ω
Open or short-circuit
C-S
5.41~6.63Ω
2.96~3.63Ω
Measure the resistance between the terminals with a tester.
(Coil wiring temperature –10°C ~ 40°C)
Outdoor fan
motor
(MF)
MAIN
AUX.
Normal
Color of
lead wire
Abnormal
MUH-GA20VB MUH-GA25/GA35VB
FUSE
INNER FUSE
145i 2°C
CUT OFF
189 ~ 233 Ω
WHT-BLK
BLK-RED
323 ~ 396 Ω
Open or short-circuit
241 ~ 296 Ω
270 ~ 332 Ω
BLK
REDWHT
P INNER PROTECTOR
10-4. Troubleshooting flow
Compressor and/or outdoor fan motor doesn’t operate.
A
Check of outdoor unit
Start
Is the switch SW2-2 on the
indoor electronic control
P.C. board set to MUH type?
Change the switch SW-2-2
on the indoor electronic control
P.C. board to MUH type.
No
Yes
Operate the unit in COOL or HEAT mode by pressing the EMERGENCY OPERATION switch.
3-minute time delay works.
Test run operation operates for 30 minutes.
Compressor
doesn't operate.
Rectify the indoor and
outdoor connecting wire.
No
No
Is there 230V AC between 4 on the
compressor contactor (52C) and
TAB20 on the deicer P.C. board?
Yes
No
+
Is there 5V DC between J205 –J101
the deicer P.C. board?
–
on
Is there 230V AC between L–N
on the outdoor terminal block (TB1)?
Yes
Yes
Replace the
deicer P.C.
board.
Is there 230V AC between 3 on the
compressor contactor (52C) and N
on the outdoor terminal block (TB1)?
Yes
No
Replace the
deicer P.C. board.
Rectify the connecting wire.
Check the compressor and compressor
capacitor, and rectify the connecting wire.
Rectify the indoor and
outdoor connecting wire.
Outdoor fan motor
doesn't operate.
No
Is there 230V AC between 4 on the
compressor contactor (52C) and
TAB 20 on the deicer P.C. board?
Yes
No
No
+
Is there 5V DC between J205 –J101 on
the deicer P.C. board?
–
Is there 230V AC between L–N on
the outdoor terminal block (TB1)?
Yes
Yes
Check the outdoor fan motor
and rectify the connecting
wire.
Replace the
deicer P.C. board.
Rectify the connecting wire.
24
Compressor and/or outdoor fan motor doesn’t stop.
B
Check of outdoor unit
Start
Turn OFF the power supply.
After 1 minute, turn ON
power supply again.
Is there 230V AC between 3 on the
compressor contactor (52C) and N on the
No
No
Does compressor stop?
Rectify the connecting wire.
outdoor terminal block (TB1)?
Yes
OK
Yes
Replace the
deicer P.C. board.
No
Replace the
deicer P.C. board.
Does outdoor fan motor stop?
Yes
OK
Unit operates COOL mode even if it is set to HEAT mode.
w First, measure the resistance of R.V. coil to confirm it is disconnected or is not short-circuit.
C
Check of R.V. coil
Turn ON the power supply and operate
the indoor unit in HEAT mode by pressing
the EMERGENCY OPERATION switch.
No
After 3 minutes, does the unit
OK
operate in COOL mode?
Yes
Is there 230V AC between
CN7211– 2on the deicer P.C.
board?
No
Replace the
deicer P.C. board
Yes
Replace the R.V. coil.
Unit operates HEAT mode even if it is set to COOL mode.
w First, measure the resistance of R.V. coil to confirm it is disconnected or is not short-circuit.
C
Check of R.V. coil
Turn ON the power supply and operate
the indoor unit in COOL mode by pressing
the EMERGENCY OPERATION switch.
Yes
No
After 3 minutes, does the unit
operate in HEAT mode?
Ok
Yes
Is there 230V AC between
CN7211– 2on the deicer
P.C. board?
No
Replace the R.V. coil.
Yes
Replace the
deicer P.C. board.
25
When OPERATION INDICATOR lamp flashes 0.5-second intervals or 1-time.
Outdoor unit does not operate.
D
How to check mis-wiring and serial signal error
w1 Set the switch(SW2-2) on indoor electronic control P.C. board to
MU or MUX type, when the outdoor unit is MU or MUX type.
If the setting is MUH or MXZ type, the unit does not work.
Start
w2 Short circuit of JPG and JPS on the indoor electronic control
P.C. board enables self-check to be displayed in 3 seconds.
Turn OFF the power supply(indoor/outdoor unit).
Set the switch(SW2-2) on the indoor electronic
control P.C. board to MU or MUX type. w1
No
Is the outdoor unit "MUH" type?
Yes
•Turn ON the power supply(indoor/outdoor unit).
•Press once EMERGENCY OPERATION switch.
•3 min. later, check the self-check result
displayed on OPERATION INDICATOR
lamp on indoor unit. w 2
Yes
OK
Does the unit operate?
No
Refer to the
"Instruction of
troubleshooting."
Serial signal error is indicated.
(0.5-sec. ON, 0.5-sec. OFF)
Yes
Is this mis-wiring, poor contact,
Make them sure.
or disconnection of wire?
No
1. Turn OFF the power supply(indoor/outdoor unit) and disconnect indoor and outdoor connecting wire on indoor side.
2. Short-circuit between indoor terminal block N and 3.
3. Turn ON the power supply(indoor unit) and press once EMERGENCY OPERATION switch.
Is there 20V DC between both ends of
No
R132 on indoor electronic control P.C.
board ?
Replace the indoor electronic
control P.C. board.
( By tester, the stylus is between 0 ~ 20V. )
Yes
•Turn OFF the power supply(indoor unit).
•Connect ON indoor and outdoor connecting wire.
Turn ON the power supply(outdoor unit).
Check the outdoor power supply,
power supply cord and
connection.
No
Is there 230V AC between outdoor terminal
block L-N (TB1)?
Yes
No
Is there 5V DC between J205 + –J101 - on the deicer P.C. board?
Replace the deicer P.C. board.
Yes
Turn ON the power supply(indoor unit).
During EMERGENCY OPERATION,
is there 10V DC between both ends
of R601?
Make the wiring between CN730
on the deicer P.C. board and
outdoor terminal block correct.
No
(By tester, the stylus is between 5 ~10V)
Yes
Replace the deicer P.C. board.
As for indoor unit MSC type, refer to service manual OB385 or OB393.
26
When OPERATION INDICATOR lamp flashes 6-time.
Thermistors in the outdoor unit are abnormal.
E
Check of outdoor thermistor
Start
Replace the deicer P.C.
board.
Defrost thermistor (RT61)
Measure
resistance
between CN 661
1and 2.
Reconnect CN661.
Turn ON the power
supply and press
the EMERGENCY
OPERATION
No
Yes
Turn OFF the
power supply.
Is the resistance of
thermistor normal?
Does the unit operate
10 minutes or more?
Yes
No
switch.
OK ❈
Replace the
thermistor.
❈ Defective contact of the connector is considered.
27
10-5. Test point diagram and voltage
E1
MUH-GA20VB -
MUH-GA25VB -
MUH-GA35VB -
E1
E1
Outdoor deicer P.C. board
CN711
Outdoor fan motor
230V AC
CN721
R.V. coil
230V AC
Power supply input
230V AC
NR61
Varistor
F61
Fuse
2A/250V
R601
5~10VDC
+
--
}
Defrost interval time
short pin
(JPDS, JPSG)
(Refer to 9-1.)
Jumper wire for
change in
defrost setting
(JRF,JRG)
(Refer to 9-2.)
}
CN661 1-2
Defrost thermistor RT61
5V DC
J205 +
J101
--
12V DC
J204
J101
+
--
28
11
DISASSEMBLY INSTRUCTIONS
<"Terminal with locking mechanism" Detaching points>
The terminal which has the locking mechanism can be detached as shown below.
There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism.
The terminal without locking mechanism can be detached by pulling it out.
Check the shape of the terminal before detaching.
(1) Slide the sleeve and check if there is a locking lever or not.
(2) The terminal with this connector has the locking
mechanism.
Sleeve
1Slide the sleeve.
2Pull the terminal while
pushing the locking
1Hold the sleeve, and
pull out the terminal
slowly.
Locking lever
lever.
Connector
E1
E1
E1
MUH-GA20VB -
MUH-GA25VB -
MUH-GA35VB -
OUTDOOR UNIT
OPERATING PROCEDURE
PHOTOS
1. Removing the cabinet
Photo 1
(1) Remove the screws of the top panel.
(2) Remove the screw of the service panel.
(3) Remove the screws of the cabinet.
(4) Remove the screws of the front panel and motor support.
(5) Remove the service panel, and remove the screw from
the insides.
Screw of the front panel and motor support
(6) Remove the top panel.
(7) Remove the cabinet.
Photo 3
Screws of the
top panel
Screws of the cabinet
Photo 2
Screws of the
top panel
Screw of the
Service panel
Screw of the cabinet
Screws of the
cabinet
(W) This photo shows MUH-GA20VB.
29
OPERATING PROCEDURE
PHOTOS
2. Removing the deicer P.C. board
Photo 4
(1) Remove the service panel and the cabinet.
(2) Disconnect all the connectors and the terminals on the
deicer P.C. board.
Screw of the
relay panel
Deicer
P.C. board
Relay panel
(3) Remove the deicer P.C. board.
Terminal
block
Surge absorber
3. Removing the propeller and the outdoor fan motor
(1) Remove the cabinet. (Refer to 1.)
(2) Remove the propeller nut.
Photo 5
(3) Remove the propeller.
NOTE : Loose the propeller in the rotating direction for
removal.
Terminal
cover
Screws of
the relay
panel
When attaching the propeller, align the mark on the
propeller and the motor shaft cut section.
Set the propeller in position by using the cut on the
shaft and the mark on the propeller.
Screw of the
outdoor fan motor
Propeller
(4) Disconnect the outdoor fan motor connector.
(5) Remove screws fixing the fan motor.
(6) Remove the outdoor fan motor.
R.V. coil
Propeller Sound proof felt
nut
(W) This photo shows MUH-GA20VB.
30
OPERATING PROCEDURE
PHOTOS
4. Removing the compressor
Photo 6
(1) Remove the cabinet. (Refer to 1.)
Discharge pipe
(2) Remove the relay panel.
(3) Remove the soundproof felt.
4-Way valve
(4) Remove the terminal cover on the compressor.
(5) Disconnect lead wires from the glass terminal of the com-
pressor.
(6) Recover gas from the refrigerant circuit.
NOTE : Recover gas from the pipes until the pressure gauge
shows 0 kg/cm2 (0 MPa).
(7) Disconnect the welded part of the discharge pipe.
(8) Disconnect the welded part of the suction pipe.
(9) Remove nuts fixing the compressor.
Glass
terminal
Suction
pipe
Compressor
( )
10 Remove the compressor.
Compressor nuts
31
12
PARTS LIST
E1
E1
E1
MUH-GA20VB -
MUH-GA25VB -
MUH-GA35VB -
12-1. OUTDOOR UNIT STRUCTURAL PARTS
22
20
19
21
18
17
15
14
16
1(W)
2
24
23
3
13
4
5
6
7
12
8
10
11
9
(W) This figure shows MUH-GA20VB.
32
E1
E1
E1
MUH-GA20VB -
MUH-GA25VB -
MUH-GA35VB -
12-1. OUTDOOR UNIT STRUCTURAL PARTS
Part numbers that are circled are not shown in the illustration.
Q'ty/unit
Symbol
in Wiring
Diagram
MUH-GA20VB
MUH-GA25VB
MUH-GA35VB
Remarks
No.
1
Part name
Part No.
E1
-
E1
-
E1
-
1
E02 904 630
E02 905 630
E02 906 630
OUTDOOR HEAT EXCHANGER
OUTDOOR HEAT EXCHANGER
OUTDOOR HEAT EXCHANGER
1
1
1
1
1
1
E02 904 301 OUTDOOR FAN MOTOR
E02 905 301 OUTDOOR FAN MOTOR
E02 899 232 CABINET
E02 903 232 CABINET
E02 927 521 GRILLE
RA6V21-
RA6V33-
MF
MF
2
3
1
1
1
1
1
1
1
1
1
4
5
E02 665 501 PROPELLER
E02 899 290 BASE
E02 905 290 BASE
6
7
1
3
1
3
3
1
E02 075 506 COMPRESSSOR RUBBER SET
E02 742 900 COMPRESSOR
E02 753 900 COMPRESSOR
E02 754 900 COMPRESSOR
E02 904 661 STOP VALVE (GAS)
E02 904 662 STOP VALVE (LIQUID)
E02 901 233 BACK PANEL
3RUBBERS/SET
RN092VHSHT
RN104VHSHT
RN135VHSHT
[9.52
MC
MC
MC
1
8
1
1
1
1
1
1
1
1
9
10
[6.35
11
E02 927 233 BACK PANEL
1
1
1
1
1
1
1
1
1
1
1
12
13
14
15
1
1
1
1
1
E02 927 245 SERVICE PANEL
E02 838 704 DRAIN SOCKET
E02 817 374 TERMINAL BLOCK
E02 836 374 TERMINAL BLOCK
E02 927 961 4-WAY VALVE
3P
2P
TB1
TB2
16
E02 931 961 4-WAY VALVE
1
1
E02 742 353 COMPRESSOR CAPACITOR
E02 665 353 COMPRESSOR CAPACITOR
E02 900 353 COMPRESSOR CAPACITOR
E02 895 383 SURGE ABSORBER
E02 904 451 DEICER P.C. BOARD
E02 905 451 DEICER P.C. BOARD
E02 906 310 DEFROST THERMISTOR
E02 899 523 CONDENSER NET
E02 838 523 CONDENSER NET
E02 927 297 TOP PANEL
E02 899 293 SEPARATOR
E02 899 515 MOTOR SUPPORT
E02 904 490 R. V. COIL
E02 906 490 R. V. COIL
E02 095 382 FUSE
20+ /440V AC
25+ /440V AC
30+ /440V AC
C1
C1
C1
1
1
17
1
1
1
1
18
19
DSAR
1
1
1
1
1
1
20
21
RT61
1
1
1
1
1
1
1
1
1
1
1
1
1
22
23
24
21S4
21S4
F61
25
1
1
1
1
1
1
1
1
1
1
1
1
250V 2A
26
27
28
29
30
31
32
33
E02 820 385 VARISTOR
NR61
E02 891 642 CHECK VALVE
E02 408 936 CAPILLARY TUBE
E02 156 936 CAPILLARY TUBE
E02 024 936 CAPILLARY TUBE
E02 339 936 CAPILLARY TUBE
E02 282 936 CAPILLARY TUBE
[3.0O[1.4O700
[3.0O[1.4O500
[3.0O[1.4O1000
[3.0O[1.4O600
[3.0O[1.4O300
1
1
1
1
33
34
35
HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN
C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
New publication, effective Feb. 2005
Distributed in Feb. 2005. No.OB387 6
Specifications subject to change without notice.
Made in Japan
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