13. PARTS LIST······················································43
14. RoHS PARTS LIST···········································49
NOTE:
This service manual describes technical data of the outdoor units.
RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the RoHS PARTS LIST (RoHS compliant).
2
Refrigeration
oil
Refrigerant
New refrigerant
R410A
HFC-32: HFC-125 (50%:50%)
Pseudo-azeotropic refrigerant
Not included
A1/A1
72.6
-51.4
1.557
64
Non combustible
0
1730
From liquid phase in cylinder
Possible
Incompatible oil
Non
Non
Previous refrigerant
R22
R22 (100%)
Single refrigerant
Included
A1
86.5
-40.8
0.94
44.4
Non combustible
0.055
1700
Gas phase
Possible
Compatible oil
Light yellow
Non
Refrigerant
Composition (Ratio)
Refrigerant handling
Chlorine
Safety group (ASHRAE)
Molecular weight
Boiling point (:)
Steam pressure [25:](Mpa)
Saturated steam density [25:](Kg/K)
Combustibility
ODP w1
GWP w2
Refrigerant charge method
Additional charge on leakage
Kind
Color
Smell
w1:Ozone Destruction Parameter : based on CFC-11
w2 :Global Warmth Parameter : based on CO
2
Revision A :
• RoHS PARTS LIST has been added.
1
MUH-A12YV -➔ MUCFH-GA35VB -
1. Indication of capacity has been changed. (BTU base ➔ kW)
MUCFH-A18WV -➔ MUCFH-GA50VB -
1. Indication of capacity has been changed. (BTU base ➔ kW)
MUCFH-A24WV -➔ MUCFH-GA60VB -
1. Indication of capacity has been changed. (BTU base ➔ kW)
TECHNICAL CHANGES
E1E1
E1E1
E1E1
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.
1 As 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.
2 Take sufficient care not to allow water and other contaminations to enter the R410Arefrigerant during storage and
installation, since it is more susceptible to contaminations than R22.
3 For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant
piping.)
4 Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent
composition change.
3
NOTE : The unit of pressure has been changed to MPa on the international system of units(SI unit system).
New SpecificationCurrent Specification
The incompatible refrigeration oil easily separates from
refrigerant and is in the upper layer inside the suction muffler.
Raising position of the oil back hole enables to back the
refrigeration oil of the upper layer to flow back to the
compressor.
Since refrigerant and refrigerating oil are compatible each,
refrigeration oil goes back to the compressor through the
lower position oil back hole.
Compressor
Suction muffler
Oil back hole
Refrigeration oil
Refrigerant
Compressor
Suction muffler
Oil back hole
Refrigeration oil /Refrigerant
Compressor
-30 -20 -1001020
30
405060
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
(MPa [Gauge])
R410A
R22
Conversion chart of refrigerant temperature and pressure
Saturated liquid pressure
(:)
R410A tools
Can R22 tools be used?
Gas leak detector
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.
Hose material and cap size have been changed to improve the pressure
resistance.
Dedicated for HFC refrigerant.
6.35 mm and 9.52 mm
Description
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).
Provided to prevent the back flow of oil. This adapter enables you to use
vacuum pumps.
It is difficult to measure R410A with a charging cylinder because the
refrigerant bubbles due to high pressure and high-speed vaporization
No
No
No
Yes
Yes
New
New
New
Gauge manifold
Charge hose
Torque wrench
Flare tool
Flare gauge
Vacuum pump
adapter
Electronic scale for
refrigerant charging
No : Not Substitutable for R410A Yes : Substitutable for R410A
No12.7 mm and 15.88 mm
The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/ff[Gauge])
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/ff[Gauge])
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.
4
Electronic scale for refrigerant charging
Outdoor unit
Refrigerant gas
cylinder
operating valve
Refrigerant gas cylinder
for R410A with siphon
Refrigerant (liquid)
Service port
Gauge manifold
valve (for R410A)
Union
Liquid pipe
Gas pipe
Stop valve
Indoor unit
Charge hose (for R410A)
2.Refrigerant piping
Wall
thickness
Outside diameter
Pipe
mm
For liquid
For gas
6.35
9.52
12.7
15.88
0.8 mm
0.8 mm
0.8 mm
1.0 mm
Heat resisting foam plastic
Specific gravity 0.045 Thickness 8 mm
Insulation material
1 Specifications
Use the refrigerant pipes that meet the following specifications.
• Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm (6.35, 9.52, 12.7), 1.0 mm (15.88).
Never use any pipe with a thickness less than 0.8 mm (6.35, 9.52, 12.7), 1.0 mm (15.88), as the pressure resistance is
insufficient.
2 Flaring 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”.
Pipe diameter
mm
6.35
9.52
12.7
15.88
Dimension of flare nut
R410A
17
22
26
29
R22
17
22
24
27
3.Refrigerant 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.
5
2
ACCESSORIES
Item
Drain socket
Drain cap [33
Drain cap [16
Q'ty
1
2
–
1
2
1
MUCFH-GA35VBMUCFH-GA50VB
1
2
–
MUCFH-GA60VB
Air inlet
Piping
Drain hose
Air outlet
Drain outlet
(back and side)
Air inlet
Piping
Drain hose
Air outlet
Drain outlet
(back and side)
Air inlet
Piping
Drain hose
Air outlet
Drain outlet
(back and side)
PART NAMES AND FUNCTIONS
MUCFH-GA35VB
MUCFH-GA60VB
MUCFH-GA50VB
6
3
Outdoor model
Function
Power supply
Capacity
Dehumidification
Air flow(High)
Power outlet
Running current
Power input
Power factor
Starting current
Compressor motor current
Fan motor current
Model
Output
Winding
resistance(at 20:)
Model
Winding
resistance(at 20:)
Dimensions WOHOD
Weight
Sound level(High)
Fan speed(High)
Fan speed regulator
Refrigerant filling
capacity(R410A)
Refrigeration oil (Model)
Thermistor RT61(at 0:)
NAME
COMPRESSOR CAPACITOR
OUTDOOR FAN CAPACITOR
SURGE ABSORBER
FUSE (3.15A)
COMPRESSOR (INNER PROTECTOR)
OUTDOOR FAN MOTOR (INNER PROTECTOR)
VARISTOR
DEFROST THERMISTOR
SOLID STATE RELAY
TERMINAL BLOCK
TERMINAL BLOCK
TRANSFORMER
CONTACTOR
R. V. COIL RELAY
R. V. COIL
COMPRESSOR CONTACTOR
MUCFH-GA60VB
DEICER
P.C.BOARD
BLU
X52
X52
NO
COM
TAB52
BLU
52C
A2A1
T61
BLK
WHT
RED
BRN
TB2
7
1
CN730
BLK
WHT
CIRCUIT BREAKER
CN721
3
52C
4
RED
C2
ORN
DSAR
TO INDOOR UNIT CONNECTING
12V
WHT
C1
BLK
S
C
R
MC
RED
NR61
3
5
BLU
TB1
GRN/YLW
POWER SUPPLY
~/N 230V 50Hz
CN661
RT61
X62
X62
1
2
3
21S4
BLU
BRN
BLU
BRN
SR61
F61
CN711
MF
123
21
ORN
RED
34
NO
COM
L
3
N
N
P E
REFRIGERANT SYSTEM DIAGRAM7
MUCFH-GA35VB
Refrigerant pipe [12.7
(with heat insulator)
Stop valve
(with service port)
Flared connection
Flared connection
Stop valve
Strainer
#100
Refrigerant pipe [6.35
(with heat insulator)
4-way valve
12
Muffler
Compressor
Capillary tube
[3.0x[1.6x1050
Check
valve
Defrost
thermistor
RT61
Outdoor
heat
exchanger
Capillary tube
[3.0x[1.4x500(2pcs)
Capillary tube
[3.0x[1.6x600
R.V. coil
heating ON
cooling OFF
Refrigerant flow in cooling
Refrigerant flow in heating
Unit:mm
MUCFH-GA50VB
Refrigerant pipe [12.7
(with heat insulator)
Flared connection
Flared connection
Refrigerant pipe[6.35
(with heat insulator)
Stop valve
(with service port)
Capillary tube
[2.5o[0.6o1,000
Receiver
Stop
valve
Strainer
4- way valve
Capillary tube
[3.0o[1.6o650
#100
Check valve
Oil separator
#100
Compressor
Capillary tube
Refrigerant flow in cooling
Refrigerant flow in heating
Defrost
thermistor
RT61
R.V. coil
Heating ON
Cooling OFF
[3.0o[1.6o500
Outdoor
heat
exchanger
Capillary tube
[3.0o[1.6o750
(2 pcs)
MUCFH-GA60VB
Refrigerant pipe [6.35
(with heat insulator)
Refrigerant pipe [15.88
(with heat insulator)
Stop valve
(with service port)
Flared connection
Flared connection
Stop valve
Muffler
Receiver
4- way valve
Capillary tube
[3.0X[2.0X400
Strainer
#100
Check valve
Muffler
#100
Compressor
Capillary tube
[3.0X[2.0X800
Refrigerant flow in cooling
Refrigerant flow in heating
The standard data contained in these specifications apply only to the operation of the air conditioner under normal condition.
Operating conditions 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
198~264V, 50Hz
(2) AIR FLOW
Air flow should be set at MAX.
(3) MAIN READINGS
COOLING
(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
Indoor air wet/dry-bulb temperature difference on the left side of the chart on next page 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.
HEATING
(1) Indoor intake air dry-bulb temperature : ˚CDB
(2) Indoor outlet air dry-bulb temperature : ˚CDB
(3) Outdoor intake air wet-bulb temperature : ˚CWB
(4) Total input : W
14
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 inlet 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 inlet.
Cover the thermometers to prevent direct rays of the sun.
3. Check that the air filter is cleaned.
4. Open windows and doors of the 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.
Air in
Air out
8.7
8.0
7.3
6.6
5.9
5.3
INDOOR UNIT
FRONT VIEW
11.1
14.7
10.2
13.4
9.2
12.1
8.3
10.9
7.5
9.7
6.6
8.5
OUTDOOR UNIT
Wet and dry-bulb
thermometers
Wet and dry-bulb
thermometers
BACK VIEW
MCFH-GA35VB
MUCFH-GA35VB
18.6
17.2
15.7
14.3
12.9
11.5
10.0
8.6
MUCFH-GA35VB
MCFH-GA35VB
MCFH-GA50VB
MUCFH-GA50VB
MCFH-GA60VB
31.8
23.4
29.3
21.6
26.9
19.8
24.4
18.0
22.0
16.2
19.5
14.4
17.1
12.6
14.7
10.8
MUCFH-GA50VB
MCFH-GA50VB
MCFH-GA60VB
MUCFH-GA60VB
MUCFH-GA60VB
OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT
COOL operation
1 Both indoor and outdoor units are under the same temperature/humidity condition.
Dry Bulb temperature (˚C)
20
25
30
Relative humidity (%)
50
60
70
15
2 Air flow should be set at MAX.
1832
230V
1520
50
25
60
307035(:)
(%)
0.7
0.8
0.9
1.0
1.1
1.2
1.3
7
8
9
10
11
12
13
1832
230V
1520
50
25
60
3070 35(:)
(%)
3
4
5
6
1.2
1.1
1.0
0.9
0.8
0.7
0.6
12
11
10
9
8
7
6
15 18 202530 32 35(:)
506070 (%)
Ambient temperature (:)
Ambient humidity (%)
Outdoor low pressure
11
10
9
8
7
6
5
15 18 202530 32 35(:)
506070 (%)
Ambient temperature (:)
Ambient humidity (%)
Outdoor unit current (A)
230V
230V
(MPa [Gauge])
(kgf/F [Gauge])
1.1
1.0
0.9
0.8
0.7
0.6
0.5
11
10
9
8
7
6
5
15 18 202530 32 35(:)
506070 (%)
Ambient temperature (:)
Ambient humidity (%)
Outdoor low pressure
12
11
10
9
8
7
6
15 18 202530 32 35(:)
506070 (%)
Ambient temperature (:)
Ambient humidity (%)
Outdoor unit current (A)
230V
230V
(MPa [Gauge])
(kgf/F [Gauge])
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/ff[Gauge])
NOTE Q :Total capacity (kW) INPUT:Total power input (W) DB : Dry-bulb temperature WB : Wet-bulb temperature
24
Jumper wire
JRF
JRG
ModelChange point
Defrost interval time changes from 40 minutes to 15 minutes.
Defrost start temperature changes from -3: to 0:.
(MUCFH-GA35VB/GA50VB)
Defrost start temperature does not change.(-3.0:) (MUCFH-GA60VB)
Defrost finish temperature changes 10.1:.(MUCFH-GA35VB)
Defrost finish temperature changes from 3.1: to 10.1:.(MUCFH-GA50VB)
Defrost finish temperature changes from 3.1: to 15:.(MUCFH-GA60VB)
MUCFH-GA35VB
MUCFH-GA50VB
MUCFH-GA60VB
9
ACTUATOR CONTROL
MUCFH-GA35VB MUCFH-GA50VB MUCFH-GA60VB
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.
Example. In case of power ON
with remote controller
(COOL / DRY)
5 sec.
(HEAT)
5 sec.
Compressor
R.V. coil
Outdoor fan
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
SERVICE FUNCTIONS10
MUCFH-GA35VB MUCFH-GA50VB MUCFH-GA60VB
10-1. COMPULSORY DEFROSTING MODE FOR SERVICE
By short circuit of the connector JPDS and JPSG (MUCFH-GA35VB/GA50VB) / JPG1 and R871 (MUCFH-GA60VB) on
the outdoor deicer P.C. board, defrosting mode can be accomplished regardless of the defrost interval restriction.
Defrost thermistor RT61 must read below -3:. (Refer to 11-5.)
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 11-5.)
25
11
TROUBLESHOOTING
MUCFH-GA35VB MUCFH-GA50VB MUCFH-GA60VB
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 the following during service.
(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 has completely closed, turn OFF the breaker.
(2) Be sure to unplug the power cord before removing the air inlet grille, the front panel, the cabinet, the top panel and
the electronic control P.C. boards.
(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.
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 11-2. “Instruction of troubleshooting”.
26
11-2. Instruction of troubleshooting
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Indoor unit
doesn't receive
the signal from
remote controller.
Indoor unit
operates.
Outdoor unit
doesn't operate
normally.
OPERATION INDICATOR
lamp on the indoor unit is
flashing on and off.
Outdoor unit
operates only
in Test Run
operation.w
Outdoor unit
doesn't
operate
even in
Test Run
operation.w
Indoor unit
operates, when
the EMERGENCY
OPERATION
switch is pressed.
Indoor unit
doesn't operate,
when the
EMERGENCY
OPERATION
switch is pressed.
Check room
temperature
thermistor.
Refer to 11-5.
"Test point
diagram and
voltage".
Refer to 11-4.
A "Check of
outdoor unit".
Refer to 11-4.
C "Check of
outdoor unit".
Refer to
"Check of
remote controller
and receiver
P.C. board".
Flash on and
off at 0.5second
interval
Cause:
Indoor/
Outdoor unit
• Mis-wiring
or trouble of
serial signal
2-time flash
Cause:
Indoor unit
• Trouble of
room
temperature/
indoor coil
thermistor
Check room
temperature
thermistor
and indoor
coil
thermistor.
Refer to 11-5.
"Test point
diagram and
voltage".
4-time flash
Cause:
Indoor unit
• Trouble of
indoor
electric
control
P.C. board
Refer to
"Check of
indoor
electric
control P.C.
board".
Refer to 11-4.
B "How to
check miswiring and
serial signal
error (When
outdoor unit
doesn't
work)".
1. Check indoor /
outdoor
connecting wire.
2. Refer to
"Check of indoor
electronic control
P.C. board".
Outdoor unit
doesn't
stop even
if indoor unit
stops.
Unit doesn't
operate
normal
operation in
COOL or
HEAT mode.
Refer to 11-4.
D "Check of
R.V. coil".
6-time flash
Cause:
Outdoor unit
• Trouble of
thermistor
in outdoor
unit
7-time flash
Cause:
Outdoor unit
• Trouble of
outdoor
control
system
Refer to 11-4.
E "Check of
outdoor
thermistor".
Replace the
deicer
P.C. board.
Refer to indoor unit service manual.
w "Test Run operation" means the operation within 30 minutes after EMERGENCY OPERATION switch is pressed.
27
11-3. Trouble criterion of main parts
P
R
C
S
RED
BLK
WHT
MAINAUX.
BLK
REDORN
WHT
MAIN
AUX
P
BLK
REDORN
WHT
MAIN
AUX
P
WHTREDBLK
MAIN
AUX.
FUSE
MUCFH-GA35VB MUCFH-GA50VB MUCFH-GA60VB
Part name
Defrost
thermistor (RT61)
Compressor
(MC)
INNER
PROTECTOR
MUCFH-
GA35VB
155i 5: OPEN
90i10: CLOSE
MUCFH-
GA50VB
/
GA60VB
160i 5: OPEN
90i10: CLOSE
Measure the resistance with a tester.
(Part temperature -10°C ~ 40°C)
Normal
5kΩ ~ 60kΩ
Measure the resistance between the terminals with a tester.
(Part temperature -10°C ~ 40°C)
Color of lead
wire
MUCFH-GA35VB
C-R
C-S
Check method and criterion
Open or short-circuit
MUCFH-GA50VB
2.46 ~ 3.01Ω
2.96 ~ 3.63Ω
1.05 ~ 1.30Ω
2.38 ~ 2.92Ω
Abnormal
Normal
MUCFH-GA60VB
0.84 ~ 1.04Ω
1.82 ~ 2.24Ω
Figure
Abnormal
Open or
short-circuit
MUCFH-GA35VB
Outdoor fan
motor
(MF)
MUCFH-
GA35VB
INNER FUSE
145i2: CUT OFF
MUCFH-
GA50VB
/
GA60VB
INNER
PROTECTOR
145i 8: OPEN
( 88i15: CLOSEw)
R.V. coil
(21S4)
w Reference value
Measure the resistance between the terminals with a tester.
(Part temperature -10°C ~ 40°C)
Color of lead
wire
WHT-BLK
BLK-RED
BLK-YLW
MUCFH-GA35VB
191 ~ 231 Ω
272 ~ 330 Ω
Normal
MUCFH-GA50VB
70 ~ 86 Ω
74 ~ 89 Ω
MUCFH-GA60VB
61 ~ 74 Ω
83 ~ 100 Ω
Abnormal
Open or
short-circuit
YLW-RED
Measure the resistance using a tester. (Part temperature -10°C ~ 40°C)
Normal
1.94 kΩ ~ 2.39 kΩ
Abnormal
Open or short-circuit
MUCFH-GA50VB
MUCFH-GA60VB
: INNER PROTECTOR
P
28
Yes
Compressor
doesn't operate.
Yes
Yes
Is there 230V AC between 3 on the
compressor contactor (52C) and N
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. Refer to 11-3.
Yes
Is there 230V AC between 4 on the
compressor contactor (52C) and
TAB20 on the deicer P.C. board?
Is there 230V AC between L–N 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.
Refer to 11-3.
Is there 230V AC between 4 on the
compressor contactor (52C) and
TAB 20 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 230V AC between L–N on
the outdoor terminal block (TB1)?
No
No
+
–
Is there 5V DC between J205 –J101 on
the deicer P.C. board?
+
–
Is there 5V DC between J205 –J101 on
the deicer P.C. board?
w Refer to 11-5.
w
w
w
w
11-4. Troubleshooting flow
Compressor and/or outdoor fan motor doesn’t operate.
A
Check of outdoor unit
MUCFH-GA35VB
MUCFH-GA50VB
29
Compressor and/or outdoor fan motor doesn’t operate.
Yes
Is there 5V DC between
J101 - J401 on the deicer
P.C. board? w1
Compressor
doesn't operate.
Yes
Is there 230V AC between
A1-A2 on the compressor
contactor(52C)?
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
Make the connection
of wiring correct.
Check the compressor.
Refer to 11-3..
Replace the compressor
contactor(52C).
Start
Yes
Is there 230V AC between
4 on the compressor
contactor(52C) and N on the
outdoor terminal block?
Yes
Is there 230V AC between
CN730 1-3 on the deicer
P.C. board? w1
Replace the
deicer P.C. board.
Replace the
deicer P.C. board.
No
Yes
No
Is there 230V AC between
3 on the compressor
contactor(52C) and N on the
outdoor terminal block?
No
No
Make the connection
of wiring correct.
Yes
Yes
Is there 230V AC between
CN711 1-3 or 2-3 on the
deicer P.C. board? w1
No
Make the connection
of wiring correct.
Check the outdoor fan
motor. Refer to 11-3.
Yes
Is there 230V AC between
CN730 1-3 on the deicer
P.C. board? w1
Replace the
deicer P.C. board.
Replace the
deicer P.C. board.
No
No
+
Is there 5V DC between
J101 - J401 on the deicer
P.C. board? w1
+
w1 Refer to 11-5.
A
Check of outdoor unit
MUCFH-GA60VB
30
When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second.
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.
During EMERGENCY OPERATION,
is there 10V DC between both ends
of R601?
(By tester, the stylus is between 5 ~10V)
Start
No
No
Is there 20V DC between both ends of
R132 on indoor electronic control P.C.
board ?
( By tester, the stylus is between 0 ~ 20V. )
•Turn OFF the power supply(indoor unit).
•Connect ON indoor and outdoor connecting wire.
Is this mis-wiring, poor contact,
or disconnection of wire?
Make them sure.
Replace the indoor electronic
control P.C. board.
Turn ON the power supply(outdoor unit).
Is there 230V AC between outdoor terminal
block L-N (TB1)?
No
Check the outdoor power supply,
power supply cord and
connection.
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
Yes
Yes
Is there 5V DC between J205 + –J101 - (MUCFH-GA35VB/GA50VB)/
J101 + –J401 - (MUCFH-GA60VB) on the deicer P.C. board?
Refer to indoor unit service manual.
Outdoor unit does not operate.
B
How to check mis-wiring and serial signal error (when outdoor unit does not work)
31
Compressor and/or outdoor fan motor doesn’t stop.
After 30 seconds,
does compressor stop?
No
Yes
Is there 230V AC between
A1-A2 on the compressor
contactor(52C)?
Replace the
deicer P.C. board.
Yes
1 Turn OFF the power supply.
2 After 30 seconds, turn ON the power supply again.
3 Operate the unit in COOL or HEAT mode by
pressing the EMERGENCY OPERATION switch.
4 Operate the unit for 1 minute or more and stop it by
pressing the EMERGENCY OPERATION switch again.
OK
No
After 30 seconds, does
outdoor fan motor stop?
Replace the
deicer P.C. board.
Yes
OK
No
Is there 230V AC between
4 on the compressor
contactor and N on the
outdoor terminal block?
Yes
Replace the compressor
contactor(52C).
No
Make the connection
of wiring correct.
After 3 minutes, does the unit
operate in HEAT mode?
OK
No
Replace the
deicer P.C. board.
Yes
Yes
No
Replace the R.V. coil.
Disconnect the TAB52 on the deicer P.C. board. (MUCFH-GA60VB)
Turn ON the power supply and operate the indoor unit in COOL mode
by pressing the EMERGENCY OPERATION switch.
Is there 230V AC between
CN7211 – 2 (MUCFH-GA35VB/GA50VB)/
CN7211 – 3 (MUCFH-GA60VB)
on the deicer P.C. board?
Does compressor stop?
No
Yes
Is there 230V AC between 3 on the
compressor contactor (52C) and N 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.
1 Turn OFF the power supply.
2 After 30 seconds, turn ON the power supply again.
3 Operate the unit in COOL or HEAT mode by
pressing the EMERGENCY OPERATION switch.
4 Operate the unit for 1 minute or more and stop it by
pressing the EMERGENCY OPERATION switch again.
Check of outdoor unit
C
MUCFH-GA35VBMUCFH-GA50VB
MUCFH-GA60VB
Unit operates HEAT mode even if it is set to COOL mode.
Check of R.V. coil
D
w First, measure the resistance of R.V. coil to confirm it is disconnected or is not short-circuit.
32
Unit operates COOL mode even if it is set to HEAT mode.
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.
Disconnect the TAB52 on the deicer P.C. board. (MUCFH-GA60VB)
Turn ON the power supply and operate the indoor unit in HEAT mode
by pressing the EMERGENCY OPERATION switch.
Is there 230V AC between
CN7211 – 2 (MUCFH-GA35VB/GA50VB)/
CN7211 – 3 (MUCFH-GA60VB)
on the deicer P.C. board?
Check of R.V. coil
D
w First, measure the resistance of R.V. coil to confirm it is disconnected or is not short-circuit.
When OPERATION INDICATOR lamp flashes 6-time.
Thermistors in the outdoor unit are abnormal.
E
Check of outdoor thermistor
w Disconnect the connectors CN661 from the deicer P.C. board.
(Check the characteristics of each thermistor.)
Defrost thermistor(RT61)
Turn OFF the
power supply.
Measure
resistance
between CN 661
1 and 2.
Does the resistance
of thermistor have
the characteristics
on 11-5.?
No
Replace the
thermistor.
Replace the deicer P.C.
board.
Reconnect CN661.
Turn ON the power
Yes
supply and press
the EMERGENCY
OPERATION
switch.
W1. It is thought defective contact of the connector.
Does the unit operate
10 minutes or more?
No
Yes
OK W1.
33
11-5. Test point diagram and voltage
MUCFH-GA35VB
MUCFH-GA50VB
Outdoor deicer P.C. board
CN711
Outdoor fan motor
230V AC
}
CN721
R.V. coil
230V AC
}
5V DC
J205
J101
+
--
(Refer to
11-4.A orB.)
Power supply input
230V AC
}
NR61
Varistor
F61
Fuse
2A/250V
R601
+
5~10V DC
}
--
Defrost interval time
short pin
(JPDS, JPSG)
(Refer to 10-1.)
Jumper wire for
}
change in defrost
setting
(JRF,JRG)
}
CN661 1-2
Defrost thermistor RT61 (Refer to 11-4. E.)
(Refer to 10-2.)
12V DC
J204
+
J101
--
34
MUCFH-GA60VB
Defrost thermistor (RT61)
-20 -10 0 10 20 30 40
0
10
20
30
40
50
60
70
80
90
100
Temperature(:)
Resistance(k")
Outdoor deicer P.C. board
CN661 1-2
Defrost thermistor (RT61)
(Refer to 11-4.E.)
Fan motor
(CN711)
230V
Varistor
(NR62)
Defrost
interval
time short
pin(JPG1,
R871)
(Refer to
10-1.)
J101
+
}
5V
DC
J401
(Refer to
11-4.A or
B.)
Jumper wire for
change in defrost
setting (JRF, JRG)
(Refer to 10-2.)
35
R.V. coil
}
(CN721)
230V
+
12V DC
}
Fuse (F61)
3.15A / 250V
Varistor
(NR61)
Power supply input
}
CN7301-3
230V AC
(Refer to
11-4.A.)
R601
}
10V DC
+
(Refer to
11-4.B.)
12
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.
Sleeve
1Slide the sleeve.
2Pull the terminal while
Locking lever
pushing the locking
lever.
12-1. MUCFH-GA35VB
OPERATING PROCEDUREPHOTOS
1. Removing the cabinet
(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.
(6) Remove the top panel.
(7) Remove the cabinet.
(2) The terminal with this connector has the locking
mechanism.
1Hold the sleeve, and
pull out the terminal
slowly.
Connector
Photo 1
Screws of the front panel and motor support
Photo 3
Screws of the
service panel
Screws of
the top panel
Screws
of the
cabinet
Screws of the cabinet
Photo 2
Service
panel
Screw of the
top panel
Screws of the
cabinet
36
OPERATING PROCEDUREPHOTOS
2. Removing the deicer P.C. board
(1) Remove the service panel and the cabinet.
(2) Disconnect all the connectors and the terminals on the
deicer P.C. board.
(3) Remove the deicer P.C. board.
3. Removing the propeller and the outdoor fan motor
(1) Remove the cabinet. (Refer to 1.)
(2) Remove the propeller nut.
(3) Remove the propeller.
NOTE : Loose the propeller in the rotating direction for
removal.
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.
(4) Remove lead clamps and disconnect the outdoor fan motor
connector.
(5) Remove screws fixing the fan motor.
(6) Remove the outdoor fan motor.
Photo 4
Screw
Photo 5
Propeller
nut
Deicer
P.C. board
Screws of the
outdoor fan motor
Propeller
Screws
Relay panel
Hook
Terminal
block
Lead clamps
Outdoor
fan motor
connector
37
Screws of the
outdoor fan motor
OPERATING PROCEDUREPHOTOS
4. Removing the compressor
(1) Remove the cabinet. (Refer to 1.)
(2) Remove the relay panel.
(3) Remove the soundproof felt.
(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/cm
(7) Disconnect the welded part of the discharge pipe.
(8) Disconnect the welded part of the suction pipe.
(9) Remove nuts fixing the compressor.
)
(
Remove the compressor.
10
2
(0 MPa).
Photo 6
Glass
terminal
Compressor
Discharge pipe
Suction pipe
Compressor nuts
Terminal cover
38
12-2. MUCFH-GA50VB
OPERATING PROCEDURE
1. Removing the cabinet
(1) Remove the screws of the cabinet.
(2) Hold the bottom of the cabinet on both sides and remove
the cabinet.
Photo 2
Screws of
the cabinet
2. Removing the deicer P.C. board
(1) Remove the service panel and the cabinet.
(2) Disconnect all the connectors and the terminals on the
deicer P.C. board.
(3) Remove the deicer P.C. board.
Photo 1
Service
panel
Photo 3
Screw of the
relay panel
PHOTOS
Deicer
P.C. board
Screws
of the
cabinet
Terminal blocks
39
Relay panel
Screw of the
relay panel
OPERATING PROCEDURE
3. Removing the propeller and the outdoor fan motor
(1) Remove the cabinet. (Refer to 1.)
(2) Remove the propeller nut and the propeller.
NOTE : Loose the propeller in the rotating direction for
removal.
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.
(3) Remove the clamp of outdoor fan motor lead wire and
disconnect the outdoor fan motor connector.
(4) Remove the screws fixing the outdoor fan motor.
(5) Remove the outdoor fan motor.
Photo 4
Propeller
PHOTOS
Set screws of the
outdoor fan motor
Lead clamps
4. Removing the compressor
(1) Remove the cabinet. (Refer to 1.)
(2) Remove the relay panel.
(3) Remove the soundproof felt.
(4) Remove the terminal cover on the compressor.
(5) Disconnect lead wires from the compressor.
(6) Recover gas from the refrigerant circuit.
NOTE : Recover gas from the pipes until the pressure gauge
shows 0 kg/cm
(7) Disconnect the welded part of the discharge pipe.
(8) Disconnect the welded part of the suction pipe.
(9) Remove nuts fixing the compressor.
)
(
Remove the compressor.
10
2
(0 MPa).
Propeller
nut
Photo 5
Compressor
Set screws of the
outdoor fan motor
Discharge
pipe
Terminal cover
Outdoor
fan motor
Suction
pipe
40
Compressor nuts
12-3. MUCFH-GA60VB
OPERATING PROCEDURE
1.Removing the cabinet
(1) Remove the screws of the service panel.
(2) Remove the screws of the top panel.
(3) Remove the screw of the valve cover.
(4) Remove the service panel.
(5) Remove the top panel.
(6) Remove the valve cover.
(7) Remove the screws of the front panel.
(8) Remove the front panel.
(9) Remove the screws of the back panel.
(10)
Remove the back panel.
Photo 3
Screw of the motor support
Photo 1
Screws
of the
cabinet
Photo 2
PHOTOS
Screw of the top panel
Screws of the cabinet
Screw of the service panel
Screws
of the
back
panel
Set screws of the back panel
2. Removing the deicer P.C. board
(1) Remove the service panel and the cabinet.
(2) Disconnect all the connectors and the terminals on the
deicer P.C. board.
(3) Remove the deicer P.C. board.
Screws
of the
front
panel
Photo 4
Deicer P.C. board
Screws
of the
top
panel
Screw
of the
valve
cover
Terminal
blocks
41
Screws
of the
relay
panel
Screws of the
relay panel
OPERATING PROCEDURE
PHOTOS
3. Removing the propeller and the outdoor fan motor
(1) Remove the cabinet. (Refer to 1.)
(2) Remove the propeller nut and the propeller.
NOTE : Loose the propeller in the rotating direction for
removal.
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.
(3) Remove the clamp of outdoor fan motor lead wire and
disconnect the outdoor fan motor connector.
(4) Remove the screws fixing the outdoor fan motor.
(5) Remove the outdoor fan motor.
Photo 5
Set screws of the
outdoor fan motor
Propeller
nut
Propeller
Set screws of the outdoor fan motor
4. Removing the compressor
(1) Remove the cabinet. (Refer to 1.)
(2) Remove the relay panel.
(3) Remove the soundproof felt.
(4) Remove the terminal cover on the compressor.
(5) Disconnect lead wires from the compressor.
(6) Recover gas from the refrigerant circuit.
NOTE : Recover gas from the pipes until the pressure gauge
shows 0 kg/cm
(7) Disconnect the welded part of the discharge pipe.
(8) Disconnect the welded part of the suction pipe.
(9) Remove nuts fixing the compressor.
OUTDOOR HEAT EXCHANGER
CABINET
GRILLE(OUT)
COMPRESSOR
COMPRESSOR RUBBER SET
BASE
STOP VALVE(GAS)
STOP VALVE(LIQUID)
4-WAY VALVE
SERVICE PANEL
BACK PANEL
MOTOR SUPPORT
TOP PANEL
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
CHECK VALVE
RN135VHSHT
3RUBBERS/SET
{12.7
{6.35
{3.0x{1.4x500
{3.0x{1.6x600
{3.0x{1.6x1050
MC
1
1
1
1
3
1
1
1
1
1
1
1
1
2
1
1
1
Symbol
in Wiring
Diagram
Part name
Q'ty/unit
MUCFH-GA35VB-
E1
PARTS LIST (non-RoHS compliant)
MUCFH-GA35VB
13-1. OUTDOOR UNIT STRUCTURAL PARTS
1
13
12
11
2
3
10
46
5
8
7
9
Part numbers that are circled are not shown in the illustration.
OUTDOOR HEAT EXCHANGER
CABINET
GRILLE(OUT)
COMPRESSOR
COMPRESSOR RUBBER SET
BASE
STOP VALVE(GAS)
STOP VALVE(LIQUID)
4-WAY VALVE
SERVICE PANEL
BACK PANEL
MOTOR SUPPORT
TOP PANEL
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
CHECK VALVE
RN135VHSHT
3RUBBERS/SET
{12.7
{6.35
{3.0x{1.4x500
{3.0x{1.6x600
{3.0x{1.6x1050
MC
1
1
1
1
3
1
1
1
1
1
1
1
1
2
1
1
1
Symbol
in Wiring
Diagram
Part name
Q'ty/unit
MUCFH-GA35VB-
E1
RoHS PARTS LIST (RoHS compliant)
MUCFH-GA35VB
14-1. OUTDOOR UNIT STRUCTURAL PARTS
1
13
12
11
2
3
10
46
5
8
7
9
Part numbers that are circled are not shown in the illustration.
MUCFH-GA60VB
14-6. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS
AND FUNCTIONAL PARTS
Part numbers that are circled are not shown in the illustration.
14-7. ACCESSORY
53
54
55
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
CC
Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
Distributed in May 2006. No.OB381 REVISED EDITION-A 6
Distributed in Jan. 2005. No.OB381 6
Made in Japan
New publication, effective May 2006
Specifications subject to change without notice.
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