Mitsubishi Electric MU-GE50VB- E1 User manual

CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS····················· 3
3. SPECIFICATION················································ 3
4. NOISE CRITERIA CURVES······························ 4
5. OUTLINES AND DIMENSIONS ························ 5
6. WIRING DIAGRAM············································ 6
7. REFRIGERANT SYSTEM DIAGRAM··············· 7
8. PERFORMANCE CURVES······························· 8
9. ACTUATOR CONTROL··································· 16
10. SERVICE FUNCTIONS···································· 17
11. TROUBLESHOOTING····································· 17
12. DISASSEMBLY INSTRUCTIONS···················· 23
HFC
utilized
R410A
SPLIT-TYPE AIR CONDITIONERS
Models
MU-GE50VB- E1
MUH-GE50VB- E1
SERVICE MANUAL
OUTDOOR UNIT
Indoor unit service manual
MS/MSH-GE•VB Series (OBH529)
No. OBH530
NOTE:
• This service manual describes technical data of outdoor units.
PARTS CATALOG (OBB530)

2
TECHNICAL CHANGES
1
MU-GA50VB- E1 MU-GE50VB- E1
1. Unit size has been changed.
(W 850 mm × H 605 mm × D 290 mm W 800 mm × H 550 mm × D 285 mm)
2. Outdoor fan motor has been changed. (RA6V50-PA RA6V33-KA)
MUH-GA50VB- E1 MUH-GE50VB- E1
1. Unit size has been changed.
(W 850 mm × H 605 mm × D 290 mm W 800 mm × H 550 mm × D 285 mm)
2. Outdoor fan motor has been changed. (RA6V60-MA RA6V33-KB)

3
PART NAMES AND FUNCTIONS
2
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
back and side
MU-GE50VB
MUH-GE50VB ACCESSORIES
MUH-GE50VB
Drain socket 1
<Outdoor unit: MUH type>
SPECIFICATION
3
Outdoor model MU-GE50VB MUH-GE50VB
Function Cooling Cooling Heating
Power supply Single phase
230 V, 50 Hz Single phase 230 V, 50 Hz
Capacity kW 5.0 5.0 5.2
Electrical
data
Breaker capacity A 15 15
Running current (Total) A 8.20 8.23 7.53
Power input (Total) W 1,810 1,780 1,610
Power factor (Total) % 96 94
Starting current (Total) A37 37
Coefficient of performance (C.O.P) (Total) 2.76 2.81 3.23
Compressor
Model RN196VHSHT RN196VHSHT
Output W 1,300 1,300
Compressor motor current A 7.57 7.60 6.90
Fan
motor
Model RA6V33-KA RA6V33-KB
Fan motor current A 0.33 0.33
Dimensions W H D mm 800 550 285 800 550 285
Weight kg 38 40
Special
remarks
Dehumidification /h 2.5 2.5 -
Air flow /h 1,902 1,902
Sound level dB 52 52
Fan speed rpm 855 855
Fan speed regulator 1 1
Refrigerant filling
capacity (R410A) kg 1.35 1.45
Refrigeration oil (Model) cc 520 (NEO 22) 520 (NEO 22)
NOTE: Test conditions are based on ISO 5151.
Cooling: Indoor Dry-bulb temperature 27°C Wet-bulb temperature 19°C
Outdoor Dry-bulb temperature 35°C Wet-bulb temperature 24°C
Heating: Indoor Dry-bulb temperature 20°C Wet-bulb temperature -°C
Outdoor Dry-bulb temperature 7°C Wet-bulb temperature 6°C
Indoor-Outdoor piping length: 5 m

4
NOISE CRITERIA CURVES
4
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-10 NC-10
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling :Dry-bulb temperature35°C Wet-bulb temperature24°C
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling :Dry-bulb temperature35°C Wet-bulb temperature24°C
Heating :Dry-bulb temperature 7°C Wet-bulb temperature 6°C
MU-GE50VB
COOL
FUNCTION
52
SPL(dB(A))LINE MUH-GE50VB COOLING
FUNCTION
52
HEATING
SPL(dB(A))LINE
OUTDOOR UNIT
MICROPHONE
1m

5
OUTLINES AND DIMENSIONS
5
10
69
800
302.5
500 Bolt pitch for installation
150
22.3
Handle
550
280
164.5
99.5
170.5
23 Service panel
Service port
285
344.5
44
400
Air in
Air out
Air in
17.5
Bolt pitch for
installation
304~325
40
Liquid refrigerant pipe joint
Refrigerant pipe (flared) ø6.35
Gas refrigerant pipe joint
Refrigerant pipe (flared) ø12.7
43°
35°
2 holes 10×21
REQUIRED SPACE Basically open 100mm or more
without any obstruction in front
and on both sides of the unit.
350mm or more
200mm or more
100mm or more
100mm or more
Open two sides of left,
right, or rear side.
Drain hole ø42
Unit: mm
OUTDOOR UNIT
MU-GE50VB MUH-GE50VB

6
WIRING DIAGRAM
6
MU-GE50VB
MUH-GE50VB

7
REFRIGERANT SYSTEM DIAGRAM
7
OUTDOOR UNIT
Unit :mm
MU-GE50VB
MUH-GE50VB
OUTDOOR UNIT
(with heat insulator)
Refrigerant pipe ø12.7 4-way valve
Defrost
thermistor
RT61
Muffler
Outdoor
heat
exchanger
Capillary tube
ø3.0 × ø1.6 × 500
Capillary tube
ø3.0 × ø1.6 × 300
Check valve
Strainer
#100
Refrigerant pipe ø6.35
(with heat insulator)
Stop valve
(with service
port)
R.V. coil
heating ON
cooling OFF
Flared connection
Flared connection
Compressor
Stop valve
Capillary tube
ø3.0 × ø1.8 × 600
(2 pcs)
Refrigerant flow in cooling
Refrigerant flow in heating
Outdoor
heat
exchanger
Capillary tube
3.0 x 1.6 x 450
Strainer
#100
Refrigerant pipe 6.35
(with heat insulator)
Stop valve
(with service port)
Compressor
Flared connection
Flared connection
Muffler
Refrigerant pipe 12.7
(with heat insulator)
Stop valve

8
The standard specifications apply only to the operation of the air conditioner under normal conditions, since operating condi-
tions vary according to the areas where these units are installed. The following information has been provided to clarify the
operating characteristics of the air conditioner under the conditions indicated by the performance curve.
(1) GUARANTEED VOLTAGE
198~264 V
(2) AIR FLOW
Air flow should be set at MAX.
(3) MAIN READINGS
(1) Indoor intake air wet-bulb temperature: °CWB
(2) Indoor outlet air wet-bulb temperature: °CWB
(3) Outdoor intake air dry-bulb temperature: °CDB
(4) Total input: W
(5) Indoor intake air dry-bulb temperature: °CDB
(6) Outdoor intake air wet-bulb temperature: °CWB
(7) Total input: W
Indoor air wet/dry-bulb temperature difference on the left side of the following chart 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.
}
}
Cooling
Heating (MUH-GE50VB)
Length of connecting pipe: m
Indoor unit
Piping size O.D: mm
Liquid
6.35
Gas
12.7
Outdoor unit
Gas 0.43
Liquid 0.5 Gas 0
Liquid 0
Model
MU-GE50VB
MUH-GE50VB 10
25
Refrigerant piping: m
Max. length
AMax. height B
Indoor
unit
Max. height
B Outdoor unit
Refrigerant Piping
Max. length
A
7 m
0
10 m
60
15 m
160
20 m
260
Calculation : Xg = 20 g/m × (A-7)m
25 m
360
MUH-GE50VB 1350
1450
MU-GE50VB
Outdoor unit precharged
Model Refrigerant piping length (one way)
MAX. HEIGHT DIFFERENCE
ADDITIONAL REFRIGERANT CHARGE (R410A: g)
MAX. REFRIGERANT PIPING LENGTH
PERFORMANCE CURVES
8
MU-GE50VB MUH-GE50VB

9
MUH-GE50VB
MU-GE50VB
11.6
10.6
9.6
8.6
7.7
6.9
Outdoor intake air Dry-bulb temperature
Indoor air Wet-bulb temperature
difference(degree)
Indoor intake air Wet-bulb temperature
Outdoor intake air Dry-bulb temperature
Indoor intake air Wet-bulb temperature
MUH-GE50VB
26.6
24.5
22.5
20.4
18.4
16.3
14.3
12.3
Outdoor intake air Wet-bulb temperature
Indoor air Dry-bulb temperature
difference(degree)
Indoor intake air Dry-bulb temperature
Indoor intake air Dry-bulb temperature
Outdoor intake air Wet-bulb temperature
NOTE: The above curves are for the heating operation without any frost.
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 (MUH-GE50VB)] 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

10
8-2. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT
COOL operation
Both indoor and outdoor unit are under the same temperature/humidity condition.
Air flow should be set at MAX.
Dry-bulb temperature Relative humidity(%)
20 50
25 60
30 70
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/cm2 [Gauge] )
18 32
230 V
15 20
50 25 60 30 70(%) 35(°C)
0.3
0.4
0.5
0.6
0.7
0.8
0.9
3
4
5
6
7
8
9
Outdoor low pressure
Ambient temperature (˚C)
Ambient humidity (%)
18 32
230V
15 20
50 25 60 30 70(%) 35(°C)
6
7
8
9
10
Ambient temperature (˚C)
Ambient humidity (%)
Outdoor unit current (A)
(kgf/ cm
2[Gauge])(MPa[Gauge]) MUH-GE50VB MUH-GE50VB
18 32
230V
15 20
50 25 60 30 70(%) 35(°C)
6
7
8
9
10
18 32
230V
15 20
50 25 60 30 70(%) 35(°C)
0.3
0.4
0.5
0.6
0.7
0.8
0.9
3
4
5
6
7
8
9
Outdoor low pressure
Outdoor unit current (A)
(kgf/cm2[Gauge])(MPa[Gauge])
Ambient temperature (˚C)
Ambient humidity(%) Ambient temperature (˚C) Ambient humidity(%)
MU-GE50VB MU-GE50VB

11
HEAT operation
Condition indoor: Dry bulb temperature 20.0 °C
Wet bulb temperature 14.5 °C Outdoor: Dry bulb temperature 7,15, 20 °C
Wet bulb temperature 6,12, 14.5° C
21
72
230V
0510
15 20 25
3
4
5
6
Outdoor unit current (A)
Ambient temperature (˚C)
MUH-GE50VB

12
MS-GE50VB : MU-GE50VB
CAPACITY : 5.0 (kW) SHF : 0.65 INPUT : 1810 (W)
PERFORMANCE DATA
COOL operation (230V)
OUTDOOR DB(°C)
INDOOR INDOOR 21 25 27 30
DB(°C) WB(°C) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT
21 18 5.88 2.76 0.47 1448 5.63 2.64 0.47 1520 5.40 2.54 0.47 1593 5.20 2.44 0.47 1665
21 20 6.13 2.14 0.35 1520 5.88 2.06 0.35 1611 5.70 2.00 0.35 1647 5.50 1.93 0.35 1720
22 18 5.88 3.00 0.51 1448 5.63 2.87 0.51 1520 5.40 2.75 0.51 1593 5.20 2.65 0.51 1665
22 20 6.13 2.39 0.39 1520 5.88 2.29 0.39 1611 5.70 2.22 0.39 1647 5.50 2.15 0.39 1720
22 22 6.38 1.72 0.27 1575 6.15 1.66 0.27 1674 6.00 1.62 0.27 1720 5.75 1.55 0.27 1792
23 18 5.88 3.23 0.55 1448 5.63 3.09 0.55 1520 5.40 2.97 0.55 1593 5.20 2.86 0.55 1665
23 20 6.13 2.63 0.43 1520 5.88 2.53 0.43 1611 5.70 2.45 0.43 1647 5.50 2.37 0.43 1720
23 22 6.38 1.98 0.31 1575 6.15 1.91 0.31 1674 6.00 1.86 0.31 1720 5.75 1.78 0.31 1792
24 18 5.88 3.47 0.59 1448 5.63 3.32 0.59 1520 5.40 3.19 0.59 1593 5.20 3.07 0.59 1665
24 20 6.13 2.88 0.47 1520 5.88 2.76 0.47 1611 5.70 2.68 0.47 1647 5.50 2.59 0.47 1720
24 22 6.38 2.23 0.35 1575 6.15 2.15 0.35 1674 6.00 2.10 0.35 1720 5.75 2.01 0.35 1792
24 24 6.70 1.54 0.23 1647 6.45 1.48 0.23 1738 6.30 1.45 0.23 1792 6.10 1.40 0.23 1882
25 18 5.88 3.70 0.63 1448 5.63 3.54 0.63 1520 5.40 3.40 0.63 1593 5.20 3.28 0.63 1665
25 20 6.13 3.12 0.51 1520 5.88 3.00 0.51 1611 5.70 2.91 0.51 1647 5.50 2.81 0.51 1720
25 22 6.38 2.49 0.39 1575 6.15 2.40 0.39 1674 6.00 2.34 0.39 1720 5.75 2.24 0.39 1792
25 24 6.70 1.81 0.27 1647 6.45 1.74 0.27 1738 6.30 1.70 0.27 1792 6.10 1.65 0.27 1882
26 18 5.88 3.94 0.67 1448 5.63 3.77 0.67 1520 5.40 3.62 0.67 1593 5.20 3.48 0.67 1665
26 20 6.13 3.37 0.55 1520 5.88 3.23 0.55 1611 5.70 3.14 0.55 1647 5.50 3.03 0.55 1720
26 22 6.38 2.74 0.43 1575 6.15 2.64 0.43 1674 6.00 2.58 0.43 1720 5.75 2.47 0.43 1792
26 24 6.70 2.08 0.31 1647 6.45 2.00 0.31 1738 6.30 1.95 0.31 1792 6.10 1.89 0.31 1882
26 26 6.90 1.31 0.19 1738 6.70 1.27 0.19 1828 6.60 1.25 0.19 1882 6.40 1.22 0.19 1937
27 18 5.88 4.17 0.71 1448 5.63 3.99 0.71 1520 5.40 3.83 0.71 1593 5.20 3.69 0.71 1665
27 20 6.13 3.61 0.59 1520 5.88 3.47 0.59 1611 5.70 3.36 0.59 1647 5.50 3.25 0.59 1720
27 22 6.38 3.00 0.47 1575 6.15 2.89 0.47 1674 6.00 2.82 0.47 1720 5.75 2.70 0.47 1792
27 24 6.70 2.35 0.35 1647 6.45 2.26 0.35 1738 6.30 2.21 0.35 1792 6.10 2.14 0.35 1882
27 26 6.90 1.59 0.23 1738 6.70 1.54 0.23 1828 6.60 1.52 0.23 1882 6.40 1.47 0.23 1937
28 18 5.88 4.41 0.75 1448 5.63 4.22 0.75 1520 5.40 4.05 0.75 1593 5.20 3.90 0.75 1665
28 20 6.13 3.86 0.63 1520 5.88 3.70 0.63 1611 5.70 3.59 0.63 1647 5.50 3.47 0.63 1720
28 22 6.38 3.25 0.51 1575 6.15 3.14 0.51 1674 6.00 3.06 0.51 1720 5.75 2.93 0.51 1792
28 24 6.70 2.61 0.39 1647 6.45 2.52 0.39 1738 6.30 2.46 0.39 1792 6.10 2.38 0.39 1882
28 26 6.90 1.86 0.27 1738 6.70 1.81 0.27 1828 6.60 1.78 0.27 1882 6.40 1.73 0.27 1937
29 18 5.88 4.64 0.79 1448 5.63 4.44 0.79 1520 5.40 4.27 0.79 1593 5.20 4.11 0.79 1665
29 20 6.13 4.10 0.67 1520 5.88 3.94 0.67 1611 5.70 3.82 0.67 1647 5.50 3.69 0.67 1720
29 22 6.38 3.51 0.55 1575 6.15 3.38 0.55 1674 6.00 3.30 0.55 1720 5.75 3.16 0.55 1792
29 24 6.70 2.88 0.43 1647 6.45 2.77 0.43 1738 6.30 2.71 0.43 1792 6.10 2.62 0.43 1882
29 26 6.90 2.14 0.31 1738 6.70 2.08 0.31 1828 6.60 2.05 0.31 1882 6.40 1.98 0.31 1937
30 18 5.88 4.88 0.83 1448 5.63 4.67 0.83 1520 5.40 4.48 0.83 1593 5.20 4.32 0.83 1665
30 20 6.13 4.35 0.71 1520 5.88 4.17 0.71 1611 5.70 4.05 0.71 1647 5.50 3.91 0.71 1720
30 22 6.38 3.76 0.59 1575 6.15 3.63 0.59 1674 6.00 3.54 0.59 1720 5.75 3.39 0.59 1792
30 24 6.70 3.15 0.47 1647 6.45 3.03 0.47 1738 6.30 2.96 0.47 1792 6.10 2.87 0.47 1882
30 26 6.90 2.42 0.35 1738 6.70 2.35 0.35 1828 6.60 2.31 0.35 1882 6.40 2.24 0.35 1937
31 18 5.88 5.11 0.87 1448 5.63 4.89 0.87 1520 5.40 4.70 0.87 1593 5.20 4.52 0.87 1665
31 20 6.13 4.59 0.75 1520 5.88 4.41 0.75 1611 5.70 4.28 0.75 1647 5.50 4.13 0.75 1720
31 22 6.38 4.02 0.63 1575 6.15 3.87 0.63 1674 6.00 3.78 0.63 1720 5.75 3.62 0.63 1792
31 24 6.70 3.42 0.51 1647 6.45 3.29 0.51 1738 6.30 3.21 0.51 1792 6.10 3.11 0.51 1882
31 26 6.90 2.69 0.39 1738 6.70 2.61 0.39 1828 6.60 2.57 0.39 1882 6.40 2.50 0.39 1937
32 18 5.88 5.35 0.91 1448 5.63 5.12 0.91 1520 5.40 4.91 0.91 1593 5.20 4.73 0.91 1665
32 20 6.13 4.84 0.79 1520 5.88 4.64 0.79 1611 5.70 4.50 0.79 1647 5.50 4.35 0.79 1720
32 22 6.38 4.27 0.67 1575 6.15 4.12 0.67 1674 6.00 4.02 0.67 1720 5.75 3.85 0.67 1792
32 24 6.70 3.69 0.55 1647 6.45 3.55 0.55 1738 6.30 3.47 0.55 1792 6.10 3.36 0.55 1882
32 26 6.90 2.97 0.43 1738 6.70 2.88 0.43 1828 6.60 2.84 0.43 1882 6.40 2.75 0.43 1937
NOTE Q :Total capacity (kW) SHF :Sensible heat factor DB :Dry-bulb temperature
SHC :Sensible heat capacity (kW) INPUT :Total power input (W) WB :Wet-bulb temperature

13
PERFORMANCE DATA
COOL operation (230V)
NOTE Q :Total capacity (kW) SHF :Sensible heat factor DB :Dry-bulb temperature
SHC :Sensible heat capacity (kW) INPUT :Total power input (W) WB :Wet-bulb temperature
MS-GE50VB : MU-GE50VB
CAPACITY : 5.0 (kW) SHF : 0.65 INPUT : 1810 (W) OUTDOOR DB(°C)
INDOOR INDOOR 35 40 43 46
DB(°C) WB(°C) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT
21 18 4.90 2.30 0.47 1774 4.50 2.12 0.47 1882 4.33 2.03 0.47 1919 4.15 1.95 0.47 1955
21 20 5.15 1.80 0.35 1846 4.80 1.68 0.35 1937 4.63 1.62 0.35 1991 4.45 1.56 0.35 2045
22 18 4.90 2.50 0.51 1774 4.50 2.30 0.51 1882 4.33 2.21 0.51 1919 4.15 2.12 0.51 1955
22 20 5.15 2.01 0.39 1846 4.80 1.87 0.39 1937 4.63 1.80 0.39 1991 4.45 1.74 0.39 2045
22 22 5.45 1.47 0.27 1919 5.10 1.38 0.27 2027 4.93 1.33 0.27 2063 4.75 1.28 0.27 2100
23 18 4.90 2.70 0.55 1774 4.50 2.48 0.55 1882 4.33 2.38 0.55 1919 4.15 2.28 0.55 1955
23 20 5.15 2.21 0.43 1846 4.80 2.06 0.43 1937 4.63 1.99 0.43 1991 4.45 1.91 0.43 2045
23 22 5.45 1.69 0.31 1919 5.10 1.58 0.31 2027 4.93 1.53 0.31 2063 4.75 1.47 0.31 2100
24 18 4.90 2.89 0.59 1774 4.50 2.66 0.59 1882 4.33 2.55 0.59 1919 4.15 2.45 0.59 1955
24 20 5.15 2.42 0.47 1846 4.80 2.26 0.47 1937 4.63 2.17 0.47 1991 4.45 2.09 0.47 2045
24 22 5.45 1.91 0.35 1919 5.10 1.79 0.35 2027 4.93 1.72 0.35 2063 4.75 1.66 0.35 2100
24 24 5.75 1.32 0.23 1991 5.40 1.24 0.23 2082 5.25 1.21 0.23 2127 5.10 1.17 0.23 2172
25 18 4.90 3.09 0.63 1774 4.50 2.84 0.63 1882 4.33 2.72 0.63 1919 4.15 2.61 0.63 1955
25 20 5.15 2.63 0.51 1846 4.80 2.45 0.51 1937 4.63 2.36 0.51 1991 4.45 2.27 0.51 2045
25 22 5.45 2.13 0.39 1919 5.10 1.99 0.39 2027 4.93 1.92 0.39 2063 4.75 1.85 0.39 2100
25 24 5.75 1.55 0.27 1991 5.40 1.46 0.27 2082 5.25 1.42 0.27 2127 5.10 1.38 0.27 2172
26 18 4.90 3.28 0.67 1774 4.50 3.02 0.67 1882 4.33 2.90 0.67 1919 4.15 2.78 0.67 1955
26 20 5.15 2.83 0.55 1846 4.80 2.64 0.55 1937 4.63 2.54 0.55 1991 4.45 2.45 0.55 2045
26 22 5.45 2.34 0.43 1919 5.10 2.19 0.43 2027 4.93 2.12 0.43 2063 4.75 2.04 0.43 2100
26 24 5.75 1.78 0.31 1991 5.40 1.67 0.31 2082 5.25 1.63 0.31 2127 5.10 1.58 0.31 2172
26 26 6.05 1.15 0.19 2063 5.70 1.08 0.19 2154 5.53 1.05 0.19 2199 5.35 1.02 0.19 2244
27 18 4.90 3.48 0.71 1774 4.50 3.20 0.71 1882 4.33 3.07 0.71 1919 4.15 2.95 0.71 1955
27 20 5.15 3.04 0.59 1846 4.80 2.83 0.59 1937 4.63 2.73 0.59 1991 4.45 2.63 0.59 2045
27 22 5.45 2.56 0.47 1919 5.10 2.40 0.47 2027 4.93 2.31 0.47 2063 4.75 2.23 0.47 2100
27 24 5.75 2.01 0.35 1991 5.40 1.89 0.35 2082 5.25 1.84 0.35 2127 5.10 1.79 0.35 2172
27 26 6.05 1.39 0.23 2063 5.70 1.31 0.23 2154 5.53 1.27 0.23 2199 5.35 1.23 0.23 2244
28 18 4.90 3.68 0.75 1774 4.50 3.38 0.75 1882 4.33 3.24 0.75 1919 4.15 3.11 0.75 1955
28 20 5.15 3.24 0.63 1846 4.80 3.02 0.63 1937 4.63 2.91 0.63 1991 4.45 2.80 0.63 2045
28 22 5.45 2.78 0.51 1919 5.10 2.60 0.51 2027 4.93 2.51 0.51 2063 4.75 2.42 0.51 2100
28 24 5.75 2.24 0.39 1991 5.40 2.11 0.39 2082 5.25 2.05 0.39 2127 5.10 1.99 0.39 2172
28 26 6.05 1.63 0.27 2063 5.70 1.54 0.27 2154 5.53 1.49 0.27 2199 5.35 1.44 0.27 2244
29 18 4.90 3.87 0.79 1774 4.50 3.56 0.79 1882 4.33 3.42 0.79 1919 4.15 3.28 0.79 1955
29 20 5.15 3.45 0.67 1846 4.80 3.22 0.67 1937 4.63 3.10 0.67 1991 4.45 2.98 0.67 2045
29 22 5.45 3.00 0.55 1919 5.10 2.81 0.55 2027 4.93 2.71 0.55 2063 4.75 2.61 0.55 2100
29 24 5.75 2.47 0.43 1991 5.40 2.32 0.43 2082 5.25 2.26 0.43 2127 5.10 2.19 0.43 2172
29 26 6.05 1.88 0.31 2063 5.70 1.77 0.31 2154 5.53 1.71 0.31 2199 5.35 1.66 0.31 2244
30 18 4.90 4.07 0.83 1774 4.50 3.74 0.83 1882 4.33 3.59 0.83 1919 4.15 3.44 0.83 1955
30 20 5.15 3.66 0.71 1846 4.80 3.41 0.71 1937 4.63 3.28 0.71 1991 4.45 3.16 0.71 2045
30 22 5.45 3.22 0.59 1919 5.10 3.01 0.59 2027 4.93 2.91 0.59 2063 4.75 2.80 0.59 2100
30 24 5.75 2.70 0.47 1991 5.40 2.54 0.47 2082 5.25 2.47 0.47 2127 5.10 2.40 0.47 2172
30 26 6.05 2.12 0.35 2063 5.70 2.00 0.35 2154 5.53 1.93 0.35 2199 5.35 1.87 0.35 2244
31 18 4.90 4.26 0.87 1774 4.50 3.92 0.87 1882 4.33 3.76 0.87 1919 4.15 3.61 0.87 1955
31 20 5.15 3.86 0.75 1846 4.80 3.60 0.75 1937 4.63 3.47 0.75 1991 4.45 3.34 0.75 2045
31 22 5.45 3.43 0.63 1919 5.10 3.21 0.63 2027 4.93 3.10 0.63 2063 4.75 2.99 0.63 2100
31 24 5.75 2.93 0.51 1991 5.40 2.75 0.51 2082 5.25 2.68 0.51 2127 5.10 2.60 0.51 2172
31 26 6.05 2.36 0.39 2063 5.70 2.22 0.39 2154 5.53 2.15 0.39 2199 5.35 2.09 0.39 2244
32 18 4.90 4.46 0.91 1774 4.50 4.10 0.91 1882 4.33 3.94 0.91 1919 4.15 3.78 0.91 1955
32 20 5.15 4.07 0.79 1846 4.80 3.79 0.79 1937 4.63 3.65 0.79 1991 4.45 3.52 0.79 2045
32 22 5.45 3.65 0.67 1919 5.10 3.42 0.67 2027 4.93 3.30 0.67 2063 4.75 3.18 0.67 2100
32 24 5.75 3.16 0.55 1991 5.40 2.97 0.55 2082 5.25 2.89 0.55 2127 5.10 2.81 0.55 2172
32 26 6.05 2.60 0.43 2063 5.70 2.45 0.43 2154 5.53 2.38 0.43 2199 5.35 2.30 0.43 2244

14
MSH-GE50VB : MUH-GE50VB
CAPACITY : 5.0 (kW) SHF : 0.65 INPUT : 1780 (W)
PERFORMANCE DATA
COOL operation (230V)
NOTE Q :Total capacity (kW) SHF :Sensible heat factor DB :Dry-bulb temperature
SHC :Sensible heat capacity (kW) INPUT :Total power input (W) WB :Wet-bulb temperature
OUTDOOR DB(°C)
INDOOR INDOOR 21 25 27 30
DB(°C) WB(°C) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT
21 18 5.88 2.76 0.47 1424 5.63 2.64 0.47 1495 5.40 2.54 0.47 1566 5.20 2.44 0.47 1638
21 20 6.13 2.14 0.35 1495 5.88 2.06 0.35 1584 5.70 2.00 0.35 1620 5.50 1.93 0.35 1691
22 18 5.88 3.00 0.51 1424 5.63 2.87 0.51 1495 5.40 2.75 0.51 1566 5.20 2.65 0.51 1638
22 20 6.13 2.39 0.39 1495 5.88 2.29 0.39 1584 5.70 2.22 0.39 1620 5.50 2.15 0.39 1691
22 22 6.38 1.72 0.27 1549 6.15 1.66 0.27 1647 6.00 1.62 0.27 1691 5.75 1.55 0.27 1762
23 18 5.88 3.23 0.55 1424 5.63 3.09 0.55 1495 5.40 2.97 0.55 1566 5.20 2.86 0.55 1638
23 20 6.13 2.63 0.43 1495 5.88 2.53 0.43 1584 5.70 2.45 0.43 1620 5.50 2.37 0.43 1691
23 22 6.38 1.98 0.31 1549 6.15 1.91 0.31 1647 6.00 1.86 0.31 1691 5.75 1.78 0.31 1762
24 18 5.88 3.47 0.59 1424 5.63 3.32 0.59 1495 5.40 3.19 0.59 1566 5.20 3.07 0.59 1638
24 20 6.13 2.88 0.47 1495 5.88 2.76 0.47 1584 5.70 2.68 0.47 1620 5.50 2.59 0.47 1691
24 22 6.38 2.23 0.35 1549 6.15 2.15 0.35 1647 6.00 2.10 0.35 1691 5.75 2.01 0.35 1762
24 24 6.70 1.54 0.23 1620 6.45 1.48 0.23 1709 6.30 1.45 0.23 1762 6.10 1.40 0.23 1851
25 18 5.88 3.70 0.63 1424 5.63 3.54 0.63 1495 5.40 3.40 0.63 1566 5.20 3.28 0.63 1638
25 20 6.13 3.12 0.51 1495 5.88 3.00 0.51 1584 5.70 2.91 0.51 1620 5.50 2.81 0.51 1691
25 22 6.38 2.49 0.39 1549 6.15 2.40 0.39 1647 6.00 2.34 0.39 1691 5.75 2.24 0.39 1762
25 24 6.70 1.81 0.27 1620 6.45 1.74 0.27 1709 6.30 1.70 0.27 1762 6.10 1.65 0.27 1851
26 18 5.88 3.94 0.67 1424 5.63 3.77 0.67 1495 5.40 3.62 0.67 1566 5.20 3.48 0.67 1638
26 20 6.13 3.37 0.55 1495 5.88 3.23 0.55 1584 5.70 3.14 0.55 1620 5.50 3.03 0.55 1691
26 22 6.38 2.74 0.43 1549 6.15 2.64 0.43 1647 6.00 2.58 0.43 1691 5.75 2.47 0.43 1762
26 24 6.70 2.08 0.31 1620 6.45 2.00 0.31 1709 6.30 1.95 0.31 1762 6.10 1.89 0.31 1851
26 26 6.90 1.31 0.19 1709 6.70 1.27 0.19 1798 6.60 1.25 0.19 1851 6.40 1.22 0.19 1905
27 18 5.88 4.17 0.71 1424 5.63 3.99 0.71 1495 5.40 3.83 0.71 1566 5.20 3.69 0.71 1638
27 20 6.13 3.61 0.59 1495 5.88 3.47 0.59 1584 5.70 3.36 0.59 1620 5.50 3.25 0.59 1691
27 22 6.38 3.00 0.47 1549 6.15 2.89 0.47 1647 6.00 2.82 0.47 1691 5.75 2.70 0.47 1762
27 24 6.70 2.35 0.35 1620 6.45 2.26 0.35 1709 6.30 2.21 0.35 1762 6.10 2.14 0.35 1851
27 26 6.90 1.59 0.23 1709 6.70 1.54 0.23 1798 6.60 1.52 0.23 1851 6.40 1.47 0.23 1905
28 18 5.88 4.41 0.75 1424 5.63 4.22 0.75 1495 5.40 4.05 0.75 1566 5.20 3.90 0.75 1638
28 20 6.13 3.86 0.63 1495 5.88 3.70 0.63 1584 5.70 3.59 0.63 1620 5.50 3.47 0.63 1691
28 22 6.38 3.25 0.51 1549 6.15 3.14 0.51 1647 6.00 3.06 0.51 1691 5.75 2.93 0.51 1762
28 24 6.70 2.61 0.39 1620 6.45 2.52 0.39 1709 6.30 2.46 0.39 1762 6.10 2.38 0.39 1851
28 26 6.90 1.86 0.27 1709 6.70 1.81 0.27 1798 6.60 1.78 0.27 1851 6.40 1.73 0.27 1905
29 18 5.88 4.64 0.79 1424 5.63 4.44 0.79 1495 5.40 4.27 0.79 1566 5.20 4.11 0.79 1638
29 20 6.13 4.10 0.67 1495 5.88 3.94 0.67 1584 5.70 3.82 0.67 1620 5.50 3.69 0.67 1691
29 22 6.38 3.51 0.55 1549 6.15 3.38 0.55 1647 6.00 3.30 0.55 1691 5.75 3.16 0.55 1762
29 24 6.70 2.88 0.43 1620 6.45 2.77 0.43 1709 6.30 2.71 0.43 1762 6.10 2.62 0.43 1851
29 26 6.90 2.14 0.31 1709 6.70 2.08 0.31 1798 6.60 2.05 0.31 1851 6.40 1.98 0.31 1905
30 18 5.88 4.88 0.83 1424 5.63 4.67 0.83 1495 5.40 4.48 0.83 1566 5.20 4.32 0.83 1638
30 20 6.13 4.35 0.71 1495 5.88 4.17 0.71 1584 5.70 4.05 0.71 1620 5.50 3.91 0.71 1691
30 22 6.38 3.76 0.59 1549 6.15 3.63 0.59 1647 6.00 3.54 0.59 1691 5.75 3.39 0.59 1762
30 24 6.70 3.15 0.47 1620 6.45 3.03 0.47 1709 6.30 2.96 0.47 1762 6.10 2.87 0.47 1851
30 26 6.90 2.42 0.35 1709 6.70 2.35 0.35 1798 6.60 2.31 0.35 1851 6.40 2.24 0.35 1905
31 18 5.88 5.11 0.87 1424 5.63 4.89 0.87 1495 5.40 4.70 0.87 1566 5.20 4.52 0.87 1638
31 20 6.13 4.59 0.75 1495 5.88 4.41 0.75 1584 5.70 4.28 0.75 1620 5.50 4.13 0.75 1691
31 22 6.38 4.02 0.63 1549 6.15 3.87 0.63 1647 6.00 3.78 0.63 1691 5.75 3.62 0.63 1762
31 24 6.70 3.42 0.51 1620 6.45 3.29 0.51 1709 6.30 3.21 0.51 1762 6.10 3.11 0.51 1851
31 26 6.90 2.69 0.39 1709 6.70 2.61 0.39 1798 6.60 2.57 0.39 1851 6.40 2.50 0.39 1905
32 18 5.88 5.35 0.91 1424 5.63 5.12 0.91 1495 5.40 4.91 0.91 1566 5.20 4.73 0.91 1638
32 20 6.13 4.84 0.79 1495 5.88 4.64 0.79 1584 5.70 4.50 0.79 1620 5.50 4.35 0.79 1691
32 22 6.38 4.27 0.67 1549 6.15 4.12 0.67 1647 6.00 4.02 0.67 1691 5.75 3.85 0.67 1762
32 24 6.70 3.69 0.55 1620 6.45 3.55 0.55 1709 6.30 3.47 0.55 1762 6.10 3.36 0.55 1851
32 26 6.90 2.97 0.43 1709 6.70 2.88 0.43 1798 6.60 2.84 0.43 1851 6.40 2.75 0.43 1905

15
PERFORMANCE DATA
COOL operation (230V)
NOTE Q :Total capacity (kW) SHF :Sensible heat factor DB :Dry-bulb temperature
SHC :Sensible heat capacity (kW) INPUT :Total power input (W) WB :Wet-bulb temperature
OUTDOOR DB(°C)
INDOOR INDOOR 35 40 43 46
DB(°C) WB(°C) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT
21 18 4.90 2.30 0.47 1744 4.50 2.12 0.47 1851 4.33 2.03 0.47 1887 4.15 1.95 0.47 1922
21 20 5.15 1.80 0.35 1816 4.80 1.68 0.35 1905 4.63 1.62 0.35 1958 4.45 1.56 0.35 2011
22 18 4.90 2.50 0.51 1744 4.50 2.30 0.51 1851 4.33 2.21 0.51 1887 4.15 2.12 0.51 1922
22 20 5.15 2.01 0.39 1816 4.80 1.87 0.39 1905 4.63 1.80 0.39 1958 4.45 1.74 0.39 2011
22 22 5.45 1.47 0.27 1887 5.10 1.38 0.27 1994 4.93 1.33 0.27 2029 4.75 1.28 0.27 2065
23 18 4.90 2.70 0.55 1744 4.50 2.48 0.55 1851 4.33 2.38 0.55 1887 4.15 2.28 0.55 1922
23 20 5.15 2.21 0.43 1816 4.80 2.06 0.43 1905 4.63 1.99 0.43 1958 4.45 1.91 0.43 2011
23 22 5.45 1.69 0.31 1887 5.10 1.58 0.31 1994 4.93 1.53 0.31 2029 4.75 1.47 0.31 2065
24 18 4.90 2.89 0.59 1744 4.50 2.66 0.59 1851 4.33 2.55 0.59 1887 4.15 2.45 0.59 1922
24 20 5.15 2.42 0.47 1816 4.80 2.26 0.47 1905 4.63 2.17 0.47 1958 4.45 2.09 0.47 2011
24 22 5.45 1.91 0.35 1887 5.10 1.79 0.35 1994 4.93 1.72 0.35 2029 4.75 1.66 0.35 2065
24 24 5.75 1.32 0.23 1958 5.40 1.24 0.23 2047 5.25 1.21 0.23 2092 5.10 1.17 0.23 2136
25 18 4.90 3.09 0.63 1744 4.50 2.84 0.63 1851 4.33 2.72 0.63 1887 4.15 2.61 0.63 1922
25 20 5.15 2.63 0.51 1816 4.80 2.45 0.51 1905 4.63 2.36 0.51 1958 4.45 2.27 0.51 2011
25 22 5.45 2.13 0.39 1887 5.10 1.99 0.39 1994 4.93 1.92 0.39 2029 4.75 1.85 0.39 2065
25 24 5.75 1.55 0.27 1958 5.40 1.46 0.27 2047 5.25 1.42 0.27 2092 5.10 1.38 0.27 2136
26 18 4.90 3.28 0.67 1744 4.50 3.02 0.67 1851 4.33 2.90 0.67 1887 4.15 2.78 0.67 1922
26 20 5.15 2.83 0.55 1816 4.80 2.64 0.55 1905 4.63 2.54 0.55 1958 4.45 2.45 0.55 2011
26 22 5.45 2.34 0.43 1887 5.10 2.19 0.43 1994 4.93 2.12 0.43 2029 4.75 2.04 0.43 2065
26 24 5.75 1.78 0.31 1958 5.40 1.67 0.31 2047 5.25 1.63 0.31 2092 5.10 1.58 0.31 2136
26 26 6.05 1.15 0.19 2029 5.70 1.08 0.19 2118 5.53 1.05 0.19 2163 5.35 1.02 0.19 2207
27 18 4.90 3.48 0.71 1744 4.50 3.20 0.71 1851 4.33 3.07 0.71 1887 4.15 2.95 0.71 1922
27 20 5.15 3.04 0.59 1816 4.80 2.83 0.59 1905 4.63 2.73 0.59 1958 4.45 2.63 0.59 2011
27 22 5.45 2.56 0.47 1887 5.10 2.40 0.47 1994 4.93 2.31 0.47 2029 4.75 2.23 0.47 2065
27 24 5.75 2.01 0.35 1958 5.40 1.89 0.35 2047 5.25 1.84 0.35 2092 5.10 1.79 0.35 2136
27 26 6.05 1.39 0.23 2029 5.70 1.31 0.23 2118 5.53 1.27 0.23 2163 5.35 1.23 0.23 2207
28 18 4.90 3.68 0.75 1744 4.50 3.38 0.75 1851 4.33 3.24 0.75 1887 4.15 3.11 0.75 1922
28 20 5.15 3.24 0.63 1816 4.80 3.02 0.63 1905 4.63 2.91 0.63 1958 4.45 2.80 0.63 2011
28 22 5.45 2.78 0.51 1887 5.10 2.60 0.51 1994 4.93 2.51 0.51 2029 4.75 2.42 0.51 2065
28 24 5.75 2.24 0.39 1958 5.40 2.11 0.39 2047 5.25 2.05 0.39 2092 5.10 1.99 0.39 2136
28 26 6.05 1.63 0.27 2029 5.70 1.54 0.27 2118 5.53 1.49 0.27 2163 5.35 1.44 0.27 2207
29 18 4.90 3.87 0.79 1744 4.50 3.56 0.79 1851 4.33 3.42 0.79 1887 4.15 3.28 0.79 1922
29 20 5.15 3.45 0.67 1816 4.80 3.22 0.67 1905 4.63 3.10 0.67 1958 4.45 2.98 0.67 2011
29 22 5.45 3.00 0.55 1887 5.10 2.81 0.55 1994 4.93 2.71 0.55 2029 4.75 2.61 0.55 2065
29 24 5.75 2.47 0.43 1958 5.40 2.32 0.43 2047 5.25 2.26 0.43 2092 5.10 2.19 0.43 2136
29 26 6.05 1.88 0.31 2029 5.70 1.77 0.31 2118 5.53 1.71 0.31 2163 5.35 1.66 0.31 2207
30 18 4.90 4.07 0.83 1744 4.50 3.74 0.83 1851 4.33 3.59 0.83 1887 4.15 3.44 0.83 1922
30 20 5.15 3.66 0.71 1816 4.80 3.41 0.71 1905 4.63 3.28 0.71 1958 4.45 3.16 0.71 2011
30 22 5.45 3.22 0.59 1887 5.10 3.01 0.59 1994 4.93 2.91 0.59 2029 4.75 2.80 0.59 2065
30 24 5.75 2.70 0.47 1958 5.40 2.54 0.47 2047 5.25 2.47 0.47 2092 5.10 2.40 0.47 2136
30 26 6.05 2.12 0.35 2029 5.70 2.00 0.35 2118 5.53 1.93 0.35 2163 5.35 1.87 0.35 2207
31 18 4.90 4.26 0.87 1744 4.50 3.92 0.87 1851 4.33 3.76 0.87 1887 4.15 3.61 0.87 1922
31 20 5.15 3.86 0.75 1816 4.80 3.60 0.75 1905 4.63 3.47 0.75 1958 4.45 3.34 0.75 2011
31 22 5.45 3.43 0.63 1887 5.10 3.21 0.63 1994 4.93 3.10 0.63 2029 4.75 2.99 0.63 2065
31 24 5.75 2.93 0.51 1958 5.40 2.75 0.51 2047 5.25 2.68 0.51 2092 5.10 2.60 0.51 2136
31 26 6.05 2.36 0.39 2029 5.70 2.22 0.39 2118 5.53 2.15 0.39 2163 5.35 2.09 0.39 2207
32 18 4.90 4.46 0.91 1744 4.50 4.10 0.91 1851 4.33 3.94 0.91 1887 4.15 3.78 0.91 1922
32 20 5.15 4.07 0.79 1816 4.80 3.79 0.79 1905 4.63 3.65 0.79 1958 4.45 3.52 0.79 2011
32 22 5.45 3.65 0.67 1887 5.10 3.42 0.67 1994 4.93 3.30 0.67 2029 4.75 3.18 0.67 2065
32 24 5.75 3.16 0.55 1958 5.40 2.97 0.55 2047 5.25 2.89 0.55 2092 5.10 2.81 0.55 2136
32 26 6.05 2.60 0.43 2029 5.70 2.45 0.43 2118 5.53 2.38 0.43 2163 5.35 2.30 0.43 2207
MSH-GE50VB : MUH-GE50VB
CAPACITY : 5.0 (kW) SHF : 0.65 INPUT : 1780 (W)

16
PERFORMANCE DATA
HEAT operation (230V)
MSH-GE50VB : MUH-GE50VB
CAPACITY: 5.2 (kW) INPUT : 1610 (W) OUTDOOR WB(°C)
INDOOR -10 -5 0 5 10 15 20
DB(°C) Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT
15 3.28 1047 3.95 1256 4.63 1417 5.30 1530 5.98 1626 6.60 1674 7.28 1707
21 3.12 1127 3.74 1336 4.42 1481 5.04 1594 5.72 1674 6.34 1723 6.99 1787
26 2.81 1208 3.48 1417 4.11 1562 4.78 1674 5.46 1755 6.08 1803 6.76 1852
NOTE Q:Total capacity (kW) INPUT:Total power input (W) DB: Dry-bulb temperature WB: Wet-bulb temperature
ACTUATOR CONTROL
9
Compressor ON
OFF
(COOL/DRY)
5 seconds (HEAT) 5 seconds
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
R.V. coil
Outdoor fan
R.V. coil control
Heating ON
Cooling OFF
Dry OFF
NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor.

17
TROUBLESHOOTING
11
3. Troubleshooting procedure
1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing ON and OFF to indicate an abnormal-
ity. To make sure, check how many times the OPERATION INDICATOR lamp is flashing ON and OFF before starting
service work.
2) If the electronic control P.C. board seems to be defective, check the copper foil pattern for disconnection and the com-
ponents for bursting and discoloration.
Lead wiring Housing point
11-1. 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 of 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
confirming 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.
MU-GE50VB
MUH-GE50VB
SERVICE FUNCTIONS
10
10-1. 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 accomplished
regardless of the defrost interval restriction. (Refer to 11-4.)
Defrost thermistor RT61 must read below -3°C.
10-2. 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 11-4.)
Jumper wire
JRF
JRG
MODEL Change point
Defrost interval time changes from 40 minutes to 15 minutes.
Defrost start temperature changes from -3°C to 0°C.
MUH-GE50VB
MUH-GE50VB

18
Part name Check method and criterion Figure
Defrost
thermistor
(RT61)
MUH-GE50VB
Measure the resistance with a tester.
(Part temperature –10°C ~ 40°C)
Refer to 11-4. “Test point diagram and voltage”, “Outdoor deicer
P.C. board”, for the chart of thermistor.
Compressor
(MC)
INNER
PROTECTOR
150 ± 5°C OPEN
90 ± 10°C
CLOSE
Measure the resistance between the terminals with a tester.
(Coil wiring temperature –10°C ~ 40°C)
Terminal Normal
C-R 1.59 ~ 1.95
C-S 2.65 ~ 3.24
Outdoor fan
motor
(MF)
INNER FUSE
152°C
CUT OFF
Measure the resistance between the terminals with a tester.
(Coil wiring temperature –10°C ~ 40°C)
Color of
lear wire Normal
MU-GE50VB MUH-GE50VB
WHT-BLK 190 ~ 233 190 ~ 233
BLK-RED 271 ~ 332 271 ~ 332
P
R
C
SRED BLK
WHT
MAINAUX.
P INNER PROTECTOR
WHTRED
BLK
MAIN
AUX.
FUSE
Check of outdoor unit
Compressor and/or outdoor fan motor does not operate.
Yes
Compressor
doesn't operate.
Yes Yes
Is there 230 V AC between 3 on the
compressor contactor (52C) and
on the outdoor terminal block (TB1)?
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.
Outdoor fan motor
doesn't operate.
No
Rectify the indoor and
outdoor connecting wire.
Rectify the connecting wire.
Check the compressor and compressor
capacitor, and rectify the connecting wire.
Start
Yes
Is there 230 V AC between 4 on the
compressor contactor (52C) and
TAB20 on the deicer P.C. board?
Is there 230 V AC between
on the outdoor terminal block (TB1)?
Replace the
deicer P.C. board.
Replace the
deicer P.C.
board.
No
No
Yes Yes
No
Check the outdoor fan motor
and rectify the connecting
wire.
Is there 230 V AC between 4 on the
compressor contactor (52C) and
TAB20 on the deicer P.C. board?
Replace the
deicer P.C. board.
No
Yes
Rectify the indoor and
outdoor connecting wire.
Rectify the connecting wire.
Is there 230 V AC between on
the outdoor terminal block (TB1)?
No
No
+–
Is there 5 V DC between J205 –J101 on
the deicer P.C. board?
+–
Is there 5 V DC between J205 –J101 on
the deicer P.C. board?
MU-GE50VB MUH-GE50VB
11-2. TROUBLE CRITERION OF MAIN PARTS
11-3. TROUBLESHOOTING FLOW <MUH-GE50VB>

19
Check of outdoor unit
Does compressor stop? No
Yes
Is there 230 V AC between 3 on the
compressor contactor (52C) and on the
outdoor terminal block (TB1)?
Replace the
deicer P.C. board.
Yes
OK
No
Does outdoor fan motor stop? Replace the
deicer P.C. board.
Yes
OK
No
Rectify the connecting wire.
Start
Turn OFF the power supply.
After 1 minute, turn ON
power supply again.
Compressor and/or outdoor fan motor does not stop.
Check of R.V. coil
Unit operates COOL mode even if it is set to HEAT mode.
First, measure the resistance of R.V. coil to confirm it is disconnected or is not short-circuit.
After 3 minutes, does the unit
operate in HEAT mode? OK
No
Is there 230 V AC between
CN721 on the deicer
P.C. board?
Replace the
deicer P.C. board.
Yes
Yes
Yes
No Replace the R.V. coil.
Turn ON the power supply and operate
the indoor unit in COOL mode by pressing
the EMERGENCY OPERATION switch.
Unit operates HEAT mode even if it is set to COOL mode.
First, measure the resistance of R.V. coil to confirm it is disconnected or is not short-circuit.
After 3 minutes, does the unit
operate in COOL mode? OK
Yes
Yes
No
Replace the
deicer P.C. board
No
Replace the R.V. coil.
Turn ON the power supply and operate
the indoor unit in HEAT mode by pressing
the EMERGENCY OPERATION switch.
Is there 230 V AC between
CN721 on the deicer P.C.
board?

20
How to check mis-wiring and serial signal error
During EMERGENCY OPERATION,
is there 10 V DC between both ends
of R601?
(By tester, the stylus is between 5 ~10 V)
Turn ON the power supply(outdoor unit).
Is there 230 V AC between outdoor terminal
block (TB1)? No Check the outdoor power supply
and connection of wiring .
Yes
Turn ON the power supply(indoor unit).
No Replace the deicer P.C. board.
Yes
No Make the wiring between CN730
on the deicer P.C. board and
outdoor terminal block correct.
Replace the deicer P.C. board.
Yes
Is there 5 V DC between J205 + –J101 - on the deicer P.C. board?
Start
No
No
Is there 20 V DC between both ends of
R132 on the indoor electronic control P.C.
board ?
( By tester, the stylus is between 0 ~ 20 V. )
• Turn ON the power supply.(indoor/outdoor unit)
• Press EMERGENCY OPERATION switch once.
Is this mis-wiring, poor contact,
or wire disconnection?
Correct them.
Replace the indoor electronic
control P.C. board.
Yes
Yes
After 3 minutes, mis-wiring is indicated
(0.5-second ON, 0.5-second OFF)
on OPERATION INDICATOR
lamp on indoor unit.
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 unit)
• Connect indoor/outdoor connecting
wire.
1. Turn OFF the power supply (indoor/outdoor unit) and disconnect indoor and outdoor
connecting wire on indoor side.
2. Short-circuit terminal block N-3by lead wire.
3. Turn ON the power supply (indoor unit) and press EMERGENCY OPERATION switch once.
Refer to indoor unit service manual.
When OPERATION INDICATOR lamp flashes 0.5-second intervals.
Outdoor unit does not operate.