• Slide switch for setting the type has added on the remote controller.
Indoor units for MU type and MUH type are common specifications.
Set slide switch on the remote controller according to the type of outdoor unit.
Slide switch
MU-C07TV MU-C09TV MU-C12TV -
New model
E1
E1
E1
MUH-C07SV -➔ MUH-C07TV -
1. Rated voltage has changed to 230V.
2. Path of heat exchanger has changed.
3. Refrigerant filling capacity has changed.(0.85kg ➔ 0.90kg)
4. Capillary tube has changed.({3.0X{1.6X600 ➔ {3.0X{1.6X750, {3.0X{1.4X600 ➔ {3.0X{1.4X700)
5. Temperature of defrosting control has changed.
6. Additional refrigerant charge has been changed.(50g/m ➔ 25g/m)
MUH-C09SV -➔ MUH-C09TV -
1. Rated voltage has changed to 230V.
2. Outdoor heat exchanger has changed.
3. Refrigerant filling capacity has changed.(0.80kg ➔ 1.00kg)
5. Outdoor fan motor has changed.(RA6V23-EA➔ RA6V33-CA)
6. Temperature of defrosting control has changed.
7. Additional refrigerant charge has been changed.(50g/m ➔ 25g/m)
MUH-C12SV -➔ MUH-C12TV -
1. Rated voltage has changed to 230V.
2. Path of heat exchanger has changed.
3. Refrigerant filling capacity has changed.(1.20kg ➔ 1.25kg)
4. Capillary tube has changed.({3.0X{1.8X250, ➔ {3.0X{1.8X400)
5. High pressure protection temperature has changed.
6. Temperature of defrosting control has changed.
7. Additional refrigerant charge has been changed.(50g/m ➔ 25g/m)
E1E1
E1E1
2
Page 3
Lubricant
Refrigerant
New refrigerant
R407C
R32: R125: R134a (23%:25%:52%)
Non-azeotropic refrigerant
Not included
A1/A1
86.2
-43.6
0.9177
42.5
Non combustible
0
1530
From liquid phase in cylinder
Impossible
Incompatible oil
Non
Non
Previous refrigerant
R22
HCFC22 (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 [Gauge])
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 CFC11
w2 :Global Warmth Parameter : based on CO
2
INFORMATION FOR THE AIR CONDITIONER WITH R407C REFRIGERANT
This room air conditioner adopts HFC refrigerant (R407C) which will never destroy the ozone layer.
Pay attention to following points.
1 Take sufficient care not to allow water and other contaminations to enter the R407C refrigerant during storage and
installation, since it is more susceptible to contaminations than HCFC (R22) refrigerant.
2 Clean refrigerant pipings should be used.
3 Composition change may occur in R407C since it is a mixed refrigerant. When charging, charge liquid refrigerant to
prevent composition change.
4 Be especially careful when managing the tools.
If dust, dirt, or water mixes in the refrigerant cycle, it may cause decrease of performance.
New SpecificationPrevious Specification
The incompatible lubricant easily separates from refrigerant
and makes the layer in the upper inside the suction muffler.
The higher position of the returning oil hole enables to return
the lubricant of the upper layer to the compressor.
Compressor
Compressor
Conversion chart of refrigerant temperature and pressure
(MPa[Gauge])
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
Saturated liquid pressure
0.0
-0.5
-30 -20 -10 010 20
R407C
R22
30
Since refrigerant and lubricant are compatible each other,
lubricant returns to the compressor through the lower
position returning oil hole.
Suction muffler
Returning oil hole
Lubricant
Refrigerant
NOTE : The unit of pressure has been changed to MPa on the
The conversion factor is: 1(MPa[Gauge]) =10.2(kgf/
40 50 60
(:)
3
Suction muffler
Compressor
Returning oil hole
Lubricant and Refrigerant
international system of units(SI unit system).
ff
[Gauge])
Page 4
Electronic scale for
refrigerant charging
Refrigerant
gas cylinder
operating
valve
Refrigerant gas cylinder
for R407C with siphon
Refrigerant (liquid)
Gage manifold
Outdoor unit
Indoor unit
Union
Liquid pipe
Gas pipe
Service port
Stop valve
Charge hose
1.Tools dedicated for the air conditioner with R407C refrigerant
R407C toolsCan R22 tools be used?
Gas leak detector
A gauge manifold with a sight glass is recommended for charging the
liquid refregerant.
Hose material have been changed to improve the pressure
resistance.
Dedicated for HFC refrigerant.
Description
Provided to prevent the back flow of oil. This adapter enables you to use
existing vacuum pumps.
Use the electronic control scale for measuring the R407C.
No
No
No
Yes
Yes
New
New
Gauge manifold
Charge hose
Torque wrench
Flare tool
Vacuum pump
adapter
Electronic scale for
refrigerant charging
The following tools are required for R407C refrigerant. Some R22 tools can be substituted for R407C tools.
Do not use tools that are used with R22 refrigerant in order to avoid mixing oils.
2.Refrigerant piping
Do not use copper pipes which are broken, deformed or discoloured.
In addition, be sure that the inner surfaces of the pipes are clean, free of hazardous sulfur and oxides, or have no dust/ dirt,
shaving particles, oil, moisture or any other contamination.
•If there is a large amount of residual oil inside the piping and joints, deterioration of the refrigerant oil will result.
3.Refrigerant oil
Apply the specific refrigeration oil (accessories) to the flare and the union seat surfaces.
4.Air purge
Use the vacuum pump for air purge to protect environments, and to avoid changing the composition of refrigerant.
5.Additional charge
For additional charging, charge the refrigerant with liquid phase slowly using a gas cylinder. If the refrigerant is charged with
gas phase, the composition of refrigerant will change. In this case, ability of the refrigerating cycle decreases or normal
operation can be impossible.
If liquid refrigerant is rapidly charged at once, the compressor may be locked.
NOTE: 1. The R407C is mixed refrigerant which consist of three different kinds of evaporative temperature. As a result, the
R407C occurs the change of composition.
2. Additional refrigerant charge has been changed by change of refrigerant.(R22 ➔ R407C)
R22 : <MU-type> 15g/m ➔ R407C : <MU-C07/C09/C12TV> 15g/m
R22 : <MUH-type> 50g/m ➔ R407C : <MUH-C07/C09/C12TV> 25g/m
4
Page 5
2
1
5
1
2
2
1
1
1
1
1
1
2
3
4
5
6
7
8
9
0
Installation plate
Installation plate fixing screw 4 x 25 mm
Remote controller mounting hardware
Fixing screw for 3 3.5 x 16 mm (Black)
Battery (AAA) for remote controller
Wireless remote controller
Felt tape (Used for left or left-rear piping)
Deodorizing filter
Air cleaning filter
Refrigeration oil
<Indoor unit>
1
2
1
2
Drain socket
Drain cap [33
<Outdoor unit : MUH type only>
PART NAMES AND FUNCTIONS
INDOOR UNIT
MSC-C07TV MSC-C09TV MSC-C12TV -
E1
E1
E1
Deodorizing filter
(gray sponge type)
Air cleaning filter
(white bellows type)
Front panel
Air filter
Grille
Air inlet
Remote control
receiving section
Horizontal vane
MU-C07TV MU-C09TV MU-C12TV -
Vertical vanes
Operation section
(when the grille is open)
OUTDOOR UNIT
E1
E1
E1
Emergency operation switch
MUH-C07TV MUH-C09TV MUH-C12TV -
(back and side)
E1
E1
E1
Air inlet
Piping
Drain hose
Air outlet
Drain outlet
Remote controller
Display section
ACCESSORIES
MSC-C07TV MSC-C09TV MSC-C12TV -
MUH-C07TV MUH-C09TV MUH-C12TV -
Operation indicator lamp
Receiving section
E1
E1
E1
E1
E1
E1
5
Page 6
ON/OFF
TOO
COOL
PM
AM
TOO
WARM
ON/OFF
FAN
TOO
WARM
TOO
COOL
VANE
MODE
ECONO COOL
STOP
START
HR.
MIN.
I FEEL
COOL
DRY
PM
CLOCK
AM
RESET
CLOCK
HEAT
/FAN
/
Open the front lid.
Signal transmitting section
Operation display section
OPERATE /STOP
(ON /OFF)button
TEMPERATURE buttons
OPERATION SELECT button
FAN SPEED CONTROL button
OFF-TIMER button
HR. button
MIN. button
(TIME SET button)
ON-TIMER button
RESET button
ECONO COOL button
VANE CONTROL button
CLOCK SET button
MSC-C07TV MSC-C09TV MSC-C12TV -
E1
E1
E1
6
Page 7
3
Indoor model
Function
Indoor unit power supply
Air flow(High)
Power outlet
Running current
Power input
Power factor
Starting current
Fan motor current
Model
Winding
resistance(at20:)
Dimensions WOHOD
Weight
Air direction
Sound level(High)
Fan speed(High)
Fan speed regulator
Thermistor RT11(at25:)
Thermistor RT12(at25:)
Outdoor model
Capacity
Dehumidification
Outdoor air flow
Power outlet
Running current
Power input
Auxiliary heater
Power factor
Starting current
Compressor motor current
Fan motor current
Model
Output
Winding
resistance(at20:)
Model
Winding
resistance(at20:)
Dimensions WOHOD
Weight
Sound level
Fan speed
Fan speed regulator
Refrigerant filling
capacity(R407C)
Refrigerating oil (Model)
K /h
A
A
W
%
A
A
"
mm
kg
dB
rpm
k"
k"
kW
R/h
K /h
A
A
W
A(kW)
%
A
A
A
W
"
"
mm
kg
dB
rpm
kg
cc
MSC-C07TV -
E1
Single phase
230V,50Hz
10
0.17
35
90
—
0.17
RC4V19-BA
WHT-BLK 292
BLK-RED 325
850O278O191
9
5
3
10
10
MU-C07TV -
E1
Single phase
230V,50Hz
10
695
—
RE-130VGSHT
650
C-R 4.18
C-S 5.76
RA6V23-EB
WHT-BLK 258
BLK-RED 385
780o540o255
32
45
645
1
0.77
350 (NEO22 )
Cooling
474
36
950
2.25
0.8
1686
3.03
99
18
2.75
0.29
3.08
MSC-C09TV -
E1
Single phase
230V,50Hz
10
0.17
35
RC4V19-BA
WHT-BLK 292
BLK-RED 325
850O278O191
9
5
3
10
10
MU-C09TV -
E1
Single phase
230V,50Hz
10
—
RE-145VGSHT
700
C-R 4.03
C-S 5.71
RA6V23-EB
WHT-BLK 258
BLK-RED 385
780o540o255
32
45
645
1
0.88
350 (NEO22 )
Cooling
474
90
—
0.17
36
950
2.5
1.0
1686
3.53
795
98
19
3.25
0.29
3.01
MSC-C12TV -
E1
Single phase
230V,50Hz
10
0.19
40
RC4V19-BA
WHT-BLK 292
BLK-RED 325
850O278O191
10
5
3
10
10
MU-C12TV -
E1
Single phase
230V,50Hz
1914
10
6.01
—
0.37
RE-231VHSHT
1100
C-R 2.25
C-S 4.07
RA6V33-CB
WHT-BLK 176
BLK-RED 413
780o540o255
34
49
725
1
0.90
620 (NEO22)
Cooling
588
92
—
0.19
39
1020
3.55
1.6
1330
96
34
5.64
2.59
Electrical
data
Fan
motor
Special
remarks
Compressor
Electrical
data
Fan
motor
Special
remarks
Capacity
Coefficient of performance(C.O.P)
Outdoor unit power supply
Capacity
SPECIFICATION
NOTE:Test conditions are based on JIS C 9612.
Cooling : IndoorDB27°C / WB19°C
Outdoor DB35°C / WB24°C
7
Page 8
Indoor model
Function
Indoor unit power supply
Air flow(High)
Power outlet
Running current
Power input
Power factor
Starting current
Fan motor current
Model
Winding
resistance(at20:)
Dimensions WOHOD
Weight
Air direction
Sound level(High)
Fan speed(High)
Fan speed regulator
Thermistor RT11(at25:)
Thermistor RT12(at25:)
Outdoor model
Capacity
Dehumidification
Outdoor air flow
Power outlet
Running current
Power input
Auxiliary heater
Power factor
Starting current
Compressor motor current
Fan motor current
Model
Output
Winding
resistance(at20:)
Model
Winding
resistance(at20:)
Dimensions WOHOD
Weight
Sound level
Fan speed
Fan speed regulator
Refrigerant filling
capacity(R407C)
Refrigerating oil (Model)
Thermistor
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
provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
MU-C07TV -
E1
MU-C09TV -
E1
MU-C12TV -
MUH-C07TV -
E1
MUH-C09TV -
E1
MUH-C12TV -
E1
E1
E1
(1) GUARANTEED VOLTAGE
Rated voltage : 198 ~ 264V
, 50Hz
(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 chart on this page and 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.
Cooling
}
Heating
}
<MUH-C07/C09/C12TV>
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
TV
>) 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.
<MUH-C07/C09/C12
INDOOR UNIT
OUTDOOR UNIT
18
Page 19
MSC-C07TV - E1
(MUH-C07TV - E1 )
(MUH-C12TV - E1 )
MSC-C12TV - E1
(MUH-C09TV - E1 )
MSC-C09TV - E1
11.4
10.4
9.5
8.5
7.6
6.8
8.9
8.2
7.4
6.7
6.0
5.4
10.4
9.5
8.7
7.8
7.0
6.2
24.9
23.0
21.1
19.2
17.2
15.3
13.4
11.5
19.5
18.0
16.5
15.0
13.5
12.0
10.5
9.0
MSC-C07TV - E1
(MUH-C07TV - E1 )
(MUH-C09TV - E1 )
MSC-C09TV -
E1
(MUH-C12TV - E1 )
MSC-C12TV - E1
28.6
26.4
24.2
22.0
19.8
17.6
15.4
13.2
NOTE:The above curves are for the heating operation without any frost.
OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT
COOL operation
① Both indoor and outdoor unit are under the same temperature/humidity condition.
Dry-bulb temperature
20
25
Relative humidity(%)
50
60
3070
➁ Air 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[Gage]) =10.2(kgf/ff[Gage])
NOTE : Q:Total capacity (kW) INPUT:Total power input (W) DB : Dry-bulb temperature WB : Wet-bulb temperature
-10-505101520
QINPUTQINPUTQINPUTQINPUTQINPUTQINPUTQINPUT
E1E1
OUTDOOR WB(:)
MSC-C09TV -: MUH-C09TV -
NOTE : Q:Total capacity (kW) INPUT:Total power input (W) DB : Dry-bulb temperature WB : Wet-bulb temperature
MSC-C12TV -: MUH-C12TV -
NOTE : Q:Total capacity (kW) INPUT:Total power input (W) DB : Dry-bulb temperature WB : Wet-bulb temperature
E1E1
E1E1
34
Page 35
9
ON/OFF
FAN
TOO
WARM
TOO
COOL
VANE
MODE
ECONO COOL
STOP
START
HR.
MIN.
I FEEL
COOL
DRY
PM
CLOCK
AM
RESET
CLOCK
HEAT
/ FAN
OPERATION SELECT button
FAN SPEED CONTROL button
OFF-TIMER button
HR. button
MIN. button
(TIME SET button)
ON-TIMER button
RESET button
ECONO COOL button
VANE CONTROL button
CLOCK SET button
ON/OFF
TOO
COOL
PM
AM
TOO
WARM
/
Signal transmitting section
Operation display section
OPERATE /STOP
(ON /OFF)button
TEMPERATURE buttons
MICROPROCESSOR CONTROL
MSC-C07TV MSC-C09TV MSC-C12TV -
E1
MU-C07TV -
E1
MU-C09TV -
E1
MU-C12TV -
E1
MUH-C07TV -
E1
MUH-C09TV -
E1
MUH-C12TV -
E1
E1
E1
Once the operation mode are set, the same operation mode can be repeated by simply turning the OPERATE/STOP (ON/OFF)
button ON. Indoor unit receives the signal with a beep tone.
When the system turns off, 3-minute time delay will operate to protect system from overload and compressor will not restart for
3 minutes.
WIRELESS REMOTE CONTROLLER
INDOOR UNIT DISPLAY SECTION
Operation indicator lamp
The operation indicator at the right side of the indoor unit indicates the operation state.
lighting
Operation
Indicator
This shows that the air conditioner is operating to reach the target
temperature. Please wait unitil the target temperature is obtained.
This shows that the room temperature is approaching the target
temperature.
not lighting
Operation stateIndication
Difference between target
temperature and room temperature
Approx. 2 : or more
Approx. 2 : or less
35
Page 36
9-1. COOL () OPERATION
35
30
25
20
15
10
:
10 15 20 25 30 35
Set temperature
Initial room temperature
Set temperature and
initial room temperature in dry mode
:
(1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select COOL mode with the OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button)to select the desired temperature.
The setting range is 16 ~ 31°C
1. Indoor fan speed control
Indoor fan operates continuously at the set speed by FAN SPEED CONTROL button regardless
of thermostat’s OFF-ON.
In Auto the fan speed is as follows.
Initial temperature difference
Fan speed
Room temperature minus set temperature : 2 degrees or more································High
Room temperature minus set temperature : Between 1 and 2 degrees····················Med.
Room temperature minus set temperature : less than 1 degree································Low
2. Coil frost prevention
① Temperature control
When the indoor coil thermistor RT12 reads 4°C or below(MSC-C07/C09TV) / 0°C or below(MSC-C12TV) for 5 minutes, the coil frost prevention mode starts.
The indoor fan operates at the set speed and the compressor stops for 5 minutes.
After that, if RT12 still reads below 4°C (MSC-C07/C09TV) / 0°C (MSC-C12TV), this mode is prolonged until the
RT12 reads over 4°C (MSC-C07/C09TV) / 0°C (MSC-C12TV).
② Time control
When the three conditions as follows have been satisfied for 1 hour and 45 minutes, the compressor stops for 3 minutes. The indoor fan operates at the set speed.
a. Compressor has been continuously operating.
b. Indoor fan speed is Low or Med..
c. Room temperature is below 26°C.
When compressor stops, the accumulated time is cancelled. When compressor restarts, time counting starts
from the beginning.
Time counting also stops temporarily when the indoor fan speed becomes High or the room temperature exceeds
26°C. However, when two of the above conditions (b.and c.) are satisfied again, time accumulation is resumed.
Difference between room
temperature and set temperature during operation
1.7 deg.
1 deg.
3 deg.
Operation chart
Example
Compressor
OFF
Outdoor fan
Indoor fan
ON
9-2. DRY () OPERATION
(1) Press OPERATE/STOP(ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a
beep tone.
(2) Select DRY mode with the OPERATION SELECT button.
(3) The microprocessor reads the room temperature and determines
the set temperature. Set temperature is as shown on the right
chart.
DRY operation will not function when the room temperature is 13°C
or below.
ON
( continuously at set speed)
ON
OFF
36
Page 37
The system for dry operation uses the same refrigerant circuit as the cooling circuit.
The compressor and the indoor fan are controlled by the room temperature.
By such controls, indoor flow amounts will be reduced in order to lower humidity without much room temperature decrease.
1. Indoor fan speed control
Indoor fan operates at the set speed by FAN SPEED CONTROL button .
In Auto fan speed becomes Low.
2. The operation of the compressor and indoor / outdoor fan
Compressor operates by room temperature control and time control.
Indoor fan and outdoor fan operate in the same cycle as the compressor.
● When the room temperature is 23°C or over:
When the thermostat is ON, the compressor repeats 8 minutes ON and 3 minutes OFF.
When the thermostat is OFF, the compressor repeats 4 minutes OFF and 1 minute ON.
● When the room temperature is under 23°C.
When the thermostat is ON, the compressor repeats 2 minutes ON and 3 minutes OFF.
When the thermostat is OFF, the compressor repeats 4 minutes OFF and 1 minute ON.
Operation time chart
Example
Thermostat
Indoor fan
Outdoor fan
Compressor
OFF
OFF
ON
OFF
OFFOFF
OFF
ON
ON
3 min.
ON
OFF
ON
OFF
4 min.
ON
ON
8 min.1 min.
ON
3. Coil frost prevention
The operation is as same as coil frost prevention during COOL operation.(Refer to 9-1.2. Coil frost prevention)
However when coil frost prevention works while the indoor fan is OFF, it’s speed becomes set speed..
9-3. FAN () OPERATION <MU-C07/C09/C12TV>
(1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select FAN mode with the OPERATION SELECT button.
(3) Select the desired fan speed. When AUTO, it becomes Low.
Only indoor fan operates.
Outdoor unit does not operate.
9-4. HEAT () OPERATION <MUH-C07/C09/C12TV>
(1) Press OPERATE/STOP(ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select HEAT mode with the OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.
The setting range is 16 ~ 31°C.
1. Indoor fan speed control
(1) Indoor fan operates at the set speed by FAN SPEED CONTROL button.
In Auto the fan speed is as follows.
Initial temperature difference
Set temperature minus room temperature: 2 degrees or more················································· High
Set temperature minus room temperature: Between 1 and 2 degrees····································· Med.
Set temperature minus room temperature: less than 1 degree················································· Low
37
Fan speed
Difference between room
temperature and set temperature during operation
2 deg.
4 deg.
1 deg.
1.7 deg.
Page 38
(2) Cold air prevention control
Released
Cold Air Prevention
18: 22:
Fan speed
Set speed
Very Low or stop
<Time condition>
<Indoor fan speed>
less than 2 minutes Low
2 minutes to 4 minutes Med.
more than 4 minutes High
High pressure protection
Released
48:
52:
52: (MUH-C07/C09TV)
56: (MUH-C12TV)
Outdoor fan
OFF
ON
Indoor coil thermistor
RT12 temperature
1 When the compressor is not operating,
(1) if the temperature of indoor coil thermistor RT12 is 18°C or less, the fan stops.
(2) if the temperature of indoor coil thermistor RT12 is more than 18°C, the fan operates at Very Low.
2 When the compressor is operating,
(1) if the temperature of RT12 is 22°C or more, the fan operates at set speed.
(2) if the temperature of RT12 is less than 22°C and
(1) if the temperature of room temperature thermistor RT11 is 15°C or less, the fan stops.
(2) if the temperature of room temperature thermistor RT11 is more than 15°C, the fan operates at Very Low.
Indoor coil thermistor
RT12 temperature
NOTE : If the temperature of RT12 reads from 18°C to 22°C at the air conditioner starting and also after defrosting, this
control works.
(3) Warm air control.
When the following any condition of 1(a. ~ d.) and the condition of 2 are satisfied at the same time, warm air control
works.
1 a.) when the operation mode has been changed to HEAT mode
b.) when cold air prevention has been released
c.) when defrosting has been finished
d.) when the compressor starts in HEAT mode
2 When the temperature of indoor coil thermistor RT12 is less than 37°C.
When warm air control works, the fan speed changes as follows to blow out warm air gradually.
Gradation of fan speed in initial
The upper limit of the fan speed in MANUAL is the set speed.
The upper limit of the fan speed in AUTO is the speed decided by indoor fan speed control.
(Refer to 9-4.1. Indoor fan speed control (1).)
When the temperature of RT12 has been 37°C or more, or when the set speed has been changed, this control is
released and the fan speed is the set speed.
(4) Flow soft control
When the thermostat (compressor) is off, the indoor fan operates as follows.
RT12 fan
less than 18°Coff
18°C or moreVery Low
NOTE : When the thermostat(compressor) turns on, the fan will operate
at set speed. But until cold air prevention and warm air control
is released, the fan speed follow them.
2. High pressure protection
During heating operation, the outdoor fan motor is controlled by the temperature of indoor coil thermistor RT12 for excess
rise protection of compressor discharge pressure.
Outdoor fan OFF: 52: (MUH-C07/C09TV)
56: (MUH-C12TV)
Outdoor fan ON: 48: (MUH-C07/C09TV)
52: (MUH-C12TV)
Operation chart
Example
Indoor coil thermistor
RT12 temperature
(MUH-C07/C09TV)52˚C
(MUH-C12TV)56˚C
(MUH-C07/C09TV)48˚C
(MUH-C12TV)52˚C
Outdoor fan motor
turn OFF
Outdoor fan motor
turn ON
Outdoor fan motor
NOTE : During high pressure protection and for 4 min. and 15 sec. after high pressure protection, defrosting of outdoor heat
exchanger is not detected by the defrost thermistor RT61.(Refer to 9-4.3. Defrosting)
OFF
ON
ON
OFF
38
Page 39
3. Defrosting
Defrosting of outdoor heat exchanger is controlled by DEICER P.C. board, with detection by the defrost thermistor RT61.
(1) Starting conditions of defrost
When all conditions of a) ~ c) are satisfied, the defrosting operation starts.
a) The compressor cumulative operation time exceeds 40 minutes without the defrosting operation working.
b) RT61 reads - 4.6°C(MUH-C07TV)/ - 2.7°C(MUH-C09/C12TV) or less.
c) After releasing the high pressure protection 4 minutes and 15 seconds have elapsed.
(2) Releasing conditions of defrost
When the condition d) or e) is satisfied, the defrosting operation stops.
d) RT61 reads 12.8°C(MUH-C07TV)/ 16.3°C(MUH-C09/C12TV) or more.
e) The defrosting time exceeds 10 minutes.
Operation time chart
Example
Defrost thermistor RT61
12.8°C(MUH-C07TV) or more
16.3°C(MUH-C09/C12TV) or more
- 4.6°C(MUH-C07TV) or less
- 2.7°C(MUH-C09/C12TV) or less
Outdoor 52C
contactor
(Compressor)
X62
(R.V. coil)
SR61
Outdoor fan
Defrost
counter
Indoor fan
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Very Low
OFF
30 sec.
NOTE
15 sec.
30 sec.
5 sec.
Max 10 min.
Indoor
Horizontal vane
NOTE ● When the indoor coil thermistor RT12 reads above 18°C, indoor fan operates at Very Low for 30 seconds.
● When the indoor coil thermistor RT12 reads 18°C or less, the indoor fan stops.
Horizontal
Set position
39
Page 40
4. R.V. coil control
Mode
COOL mode of
"I FEEL CONTROL"
DRY mode of
"I FEEL CONTROL"
HEAT mode of
"I FEEL CONTROL"
Initial room temperature
MUH type
25: or more
23:or more,
less than 25:
less than 23:
MU type
25: or more
more than13:,
less than 25:
Heating · · · · · ON
Cooling · · · · · OFF
Dry · · · · · · · · OFF
NOTE : When operation starts, the 4-way valve reverses for 5 seconds right before start-up of the compressor.
Operation time chart
(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
9-5. “I FEEL CONTROL” () OPERATION
(1) Press OPERATE/STOP(ON/OFF) button on the remote
controller.
OPERATION INDICATOR lamp of the indoor unit turns
on with a beep tone.
(2) Select “I FEEL CONTROL”() mode with the OPERA-
TION SELECT button.
(3) The operation mode is determined by the initial room
temperature at start-up of the operation, as shown on the
right table.
● Once the mode is fixed, the mode does not change by room temperature afterwards.
● Under the ON-TIMER () operation, mode is determined according to the room temperature at set time the opera-
tion starts.
● When the system is stopped on the remote controller and restarted within 2 hours in “I FEEL CONTROL” () mode,
the system operates in previous mode automatically regardless of the room temperature.
Operation time chart
Example
When the system is restarted after 2 hours and more, the operation mode is determined by the room temperature at
start-up of the operation.
Operation time chart
Previous operation
COOL mode of
“I FEEL CONTROL”
or COOL mode
Example
Previous operation
COOL mode of
“I FEEL CONTROL”
or COOL mode
Restart
COOL mode of
“I FEEL CONTROL”
Restart
COOL or DRY or
HEAT mode of “I FEEL
CONTROL” that determined by room temperature at start-up of
the operation.
wHeat is available only in MUH-C07/C09/C12TV.
40
Page 41
(4) The initial set temperature is decided by the initial room temperature.
TOO
COOL
TOO
WARM
Mode
COOL mode of
"I FEEL CONTROL"
DRY mode of
"I FEEL CONTROL"
HEAT mode of
"I FEEL CONTROL"
more than 13:,
Initial room temperature
MU type
26: or more
25: to 26:
less than 25:
MUH type
26: or more
25: to 26:
23: to 25:
less than 23:
Initial set temperature
24:
❈1
Initial room temperature
minus 2:
Initial room temperature
minus 2:
26:
❈1 When the system is restarted with the remote controller, the system operates with the previous set temperature regard-
less of the room temperature at restart.
The set temperature is calculated by the previous set temperature.
(5) TEMPERATURES buttons
In “I FEEL CONTROL” () mode, set temperature is decided by the microprocessor based on the room temperature.
In addition, set temperature can be controlled by TOO WARM or TOO COOL buttons when you feel too cool or too
warm. Each time the TOO WARM or TOO COOL button is pressed, the indoor unit receives the signal and emits a
beep tone.
● Fuzzy control
When the TOO COOL or TOO WARM button is pressed, the microprocessor changes the set temperature, considering
the room temperature, the frequency of pressing TOO COOL or TOO WARM button and the user’s preference to heat
or cool. So this is called “Fuzzy control”, and works only in “I FEEL CONTROL” mode.
In DRY mode of “I FEEL CONTROL”, the set temperature doesn’t change.
…
To raise the set temperature 1~2 degrees(°C)
…
To lower the set temperature 1~2 degrees(°C)
— COOL mode of “I FEEL CONTROL” —
1. Indoor fan speed control
Indoor fan speed control is as same as COOL OPERATION.(9-1.1. Indoor fan speed control)
2. Coil frost prevention
Coil frost prevention is as same as COOL OPERATION.(9-1.2. Coil frost prevention)
— DRY mode of “I FEEL CONTROL” —
1. Indoor fan speed control
Indoor fan speed control is as same as DRY OPERATION.(9-2.1. Indoor fan speed control)
2. The operation of the compressor and indoor / outdoor fan
The operation of the compressor and indoor / outdoor fan is as same as DRY OPERATION.
(9-2.2. The operation of the compressor and indoor / outdoor fan)
3. Coil frost prevention
Coil frost prevention is as same as DRY OPERATION.(9-2.3. Coil frost prevention)
— HEAT mode of “I FEEL CONTROL” — <MUH-C07/C09/C12TV>
1. Indoor fan speed control
Indoor fan speed control is as same as HEAT OPERATION.(9-4.1. Indoor fan speed control)
2. High pressure protection
High pressure protection is as same as HEAT OPERATION.(9-4.2. High pressure protection)
3. Defrosting
Defrosting is as same as HEAT OPERATION.(9-4.3. Defrosting)
4. R.V. coil control
R.V. coil control is as same as HEAT OPERATION.(9-4.4. R.V. coil control)
41
Page 42
High
Med.
Low
High
AUTO
Horizontal
MiddleDownwardSwing
9-6. FAN MOTOR CONTROL
(1) Rotational frequency feedback control
The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feedback
the rotational frequency. Comparing the current rotational frequency with the target rotational frequency (High,Med.,Low),
the microprocessor controls SR141and adjusts fan motor electric current to make the current rotational frequency close to
the target rotational frequency . With this control, when the fan speed is switched, the rotational frequency changes smoothly.
(2) Fan motor lock-up protection
When the rotational frequency feedback signal is not output for 12 seconds, (or when the microprocessor cannot detect
the signal for 12 seconds) the fan motor is regarded locked-up. Then the electric current to the fan motor is shut off. 3 minutes later, the electric current is applied to the fan motor again. During the fan motor lock-up, the OPERATION INDICATOR lamp flashes on and off to show the fan motor abnormality. (Refer to page 50.)
9-7. AUTO VANE OPERATION
(1) Vane motor drive
These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of
the motor are controlled by pulse signals (approx. 12V) transmitted from indoor microprocessor.
(2) The horizontal vane angle and mode changes as follows by pressing the VANE CONTROL button.
(3) Positioning
The vane is once pressed to the vane stopper below to confirm the standard position and then set to the desired angle.
Confirming of standard position is performed in case of follows.
(a) When the OPERATE / STOP(ON / OFF) button is pressed (Power ON/OFF).
(b) When the vane control is changed from AUTO to MANUAL.
(c) When the SWING is finished.
(d) When the test run starts.
(e) When the power supply turns ON.
(4) VANE AUTO () mode
In VANE AUTO mode, the microprocessor automatically determines the vane angle and operation to make the optimum
room-temperature distribution.
1 In COOL and DRY operation
2 In FAN operation <MU-C07/C09/C12TV>
2 In HEAT operation
(5) STOP (operation OFF) and ON-TIMER standby.
When the following cases occur, the vane returns to the closed position.
(a) When the OPERATE/STOP(ON/OFF) button is pressed (POWER OFF).
(b) When the operation is stopped by the emergency operation.
(c) When the ON-TIMER is on standby.
(6) Dew prevention
During COOL or DRY operation at Vane Angle 4 or 5 when the cumulative operation time of compressor exceeds 1
hour, the vane angle automatically changes to Angle 1 for dew prevention.
(7) SWING MODE ()
By selecting SWING mode with the VANE CONTROLbutton, the horizontal vane swings vertically.The remote controller
displays “”.
<MUH-C07/C09/C12TV>
Vane angle is fixed to Angle 1.
Vane angle is fixed to Angle 4.
42
Page 43
(8) Cold air prevention in HEAT operation<MUH-C07/C09/C12TV>
Set position
Angle 1
Released
Cold air prevention
24:
28:
When any of the following conditions occurs in HEAT operation, the horizontal vane angle changes to Angle 1 automatically to prevent cold air blowing on users.
① Compressor is not operating.
➁ Defrosting is performed.
➂ Indoor coil thermistor RT12 reads 24: or below.
➃ Indoor coil thermistor RT12 temperature is raising from 24°C or below, but it does not exceed 28:.
Indoor coil thermistor
RT12 temperature
NOTE : If the temperature of RT12 reads from 24: to 28: at the air conditioner starting this control works.
When the ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher than that
in COOL mode.
Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger(RT12).
SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher than
that in COOL mode, the air conditioner can keep comfort. As a result, energy can be saved.
ECONO COOL operation is cancelled when the ECONO COOL button is pressed once again or VANE CONTROL
button is pressed or change to other operation mode.
NOTE : ECONO COOL operation not work in COOL mode of “I FEEL CONTROL”.
SWING operation
In swing operation of ECONO COOL operation air flow is initially blew out upward(levelly).
According to the temperature of indoor coil thermistor RT12 at starting of this operation, next downward blow time is
decided. Then when the downward blow has been finished, next upward blow time is decided.
For initial 10 minutes the swing operation is performed in table G~H for quick cooling(but G : RT 12 is 24: or less).
Also, after 10 minutes when the difference of set temperature and room temperature is more than 2:, the swing
operation is performed in table D~H for more cooling(but D: RT12 is 20: or less).
The air conditioner repeats the swing operation in various cycle as follows.
Temperature of indoor
coil thermistor RT12
A
B
C
D
E
F
G
H
15°C or less
15°C to 17°C
17°C to 18°C
18°C to 20°C
20°C to 21°C
21°C to 22°C
22°C to 24°C
more than 24°C
Downward blow time
(sec.)
2
5
8
11
14
17
20
23
Upward(level) blow time
Horizontal vane
(sec.)
23
20
17
14
11
8
5
2
9-8. TIMER OPERATION
1. How to set the timer
(1) Press OPERATE/STOP(ON/OFF) button to start the air conditioner.
(2) Check that the current time is set correctly.
NOTE : Timer operation will not work without setting the current time. Initially “AM0:00” blinks at the current time display
of TIME MONITOR, so set the current time correctly with CLOCK SET button.
(3) Press ON/OFF TIMER buttons to select the operation.
ON-TIMER button... AUTO START operation (ON timer)
OFF-TIMER button... AUTO STOP operation (OFF timer)
43
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EMERGENCY OPERATION switch
PM
AM
PM
PM
(4) Press HR. and MIN. button (TIME SET button) to set the timer. Time setting is 10-minute units.
HR. and MIN. button will work when “” or “” mark is flashing.
These marks disappear in 1 minute.
After setting the ON timer, check that OPERATION INDICATOR lamp of the indoor unit lights.
NOTE1 : Be sure to place the remote controller at the position where its signal can reach the air conditioner even during
TIMER operation, or the set time may deviate within the range of about 10 minutes.
NOTE2 : Reset the timer in the following cases, or the set time may deviate and other malfunctions may occur.
● A power failure occurs.
● The circuit breaker functions.
2. Cancel
TIMER setting can be cancelled with the ON/OFF TIMER buttons.
To cancel the ON timer, press the ON-TIMER button.
To cancel the OFF timer, press the OFF-TIMER button.
TIMER is cancelled and the display of set time disappears.
PROGRAM TIMER
● The OFF timer and ON timer can be used in combination.
● “” and “ ” display shows the order of the OFF timer and ON timer operation.
(Example 1) The current time is 8:00 PM.
The unit turns off at 11:00 PM, and on at 6:00 AM.
(Example 2) The current time is 11:00 AM.
The unit turns on at 5:00 PM, and off at 9:00 PM.
NOTE : TIMER setting will be cancelled by power failure or breaker functioning.
9-9. EMERGENCY-TEST OPERATION
In case of test run operation or emergency operation, use the EMERGENCY OPERATION switch on the front of the
indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of remote
controller run down. The unit will start and the OPERATION INDICATOR lamp will light.
The first 30 minutes of operation is the test run operation. This operation is for servicing. The indoor fan speed runs at
High speed and the system is in continuous operation. (The thermostat is ON.)
After 30 minutes of test run operation the system shifts to EMERGENCY COOL
MODE with a set temperature of 24°C.
The fan speed shifts to Med. speed.
The coil frost prevention works even in emergency operation, and defrosting
In the test run or emergency operation, the horizontal vane operates in VANE AUTO () mode.
Emergency operation continues until the EMERGENCY OPERATION switch is pressed once again(MU-C07/C09/C12TV)/
once or twice(MUH-C07/C09/C12TV) or the unit receives any signal from the remote controller. In case of latter normal
operation will start.
/ HEAT
<MUH-C07/C09/C12TV only>
<MUH-C07/C09/C12TV only> too.
NOTE : Do not press the EMERGENCY OPERATION switch during normal operation.
Press once <Cool>
Press again <Heat>
Press once again <Stop>
wHeat is available only in MUH-C07/C09/C12TV.
44
OPERATION INDICATOR lamp
Page 45
10
MUH-C07TV MUH-C09TV MUH-C12TV -
Jumper wire
JPC
ModelChange point
Defrost interval time changes from 40 minutes to 15 minutes.
E1
E1
E1
SERVICE FUNCTIONS
MSC-C07TV MSC-C09TV MSC-C12TV -
E1
MU-C07TV -
E1
MU-C09TV -
E1
MU-C12TV -
E1
MUH-C07TV -
E1
MUH-C09TV -
E1
MUH-C12TV -
E1
E1
E1
10-1. COMPULSORY DEFROSTING MODE FOR SERVICE<MUH-C07/C09/C12TV>
By short circuit of the connector JP607 and R853 on the outdoor deicer P.C. board, defrosting mode can be accomplished regardless of the defrost interval restriction. (Refer to page 58.)
Defrost thermistor RT61 must read below -4.6°C(MUH-C07TV)/ -2.7°C(MUH-C09/C12TV).
10-2. CHANGE IN DEFROST SETTING<MUH-C07/C09/C12TV>
<JPC> when the JPC wire of the deicer P.C. board is cut, the defrost interval time will be changed. (Refer to page 58.)
10-3. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS the electronic control P.C. board.
The time will be shortened as follows.(Refer to page 57.)
Set time : 1 minute ➔ 1-second
Set time : 3 minute ➔ 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is
shortened by short circuit of JPG and JPS.)
10-4. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION
A maximum of 4 indoor units with wireless remote controllers can be used in a room.
In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be
modified according to the number of the indoor unit.
How to modify the remote controller P.C. board
Remove batteries before modification.
The board has a print as shown below :
NOTE : For remodelling, take out the bat-
teries and push the
OPERATE/STOP(ON/OFF)button
twice or 3 times at first.
After finish remodelling, put back
the batteries then push the RESET
The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown
in Table 1. After modification, push the RESET button.
45
button.
Page 46
Table 1
No. 1 unit
No. 2 unit
No. 3 unit
No. 4 unit
1 unit operation
No modification
–
–
–
2 units operation
Same as at left
Solder J1
–
–
3 units operation
Same as at left
Same as at left
Solder J2
–
4 units operation
Same as at left
Same as at left
Same as at left
Solder both J1 and J2
Slide switch
Type
The position
of the slide
switch
COOL ONLYCOOL & HEAT
1 2
C111
CN201
C11
CN211
IC152
CN151
SW1
CN112
CN121
IC101
CN111
CN202
TAB12
SW2
SW2
INDOOR ELECTRIC CONTROL P.C. BOARD
1 2
SW2
1 2
SW2-1 sets the AUTO RESTART FUNCTION ON / OFF.
SW2-2 switches over the MU type/ MUH type.
When the units are shipped from the factory, SW2 is as follows.
SW2-1: AUTO RESTART FUNCTION OFF
SW2-2: MUH type
}
1 2
SW2
1 2
1 2
SW2
1 2
Outdoor unit MUH type
Set 2 switch downside.
Outdoor unit MU type
Set 2 switch upside.
NOTE : At power supply failure or installation, indoor unit deletes the memory about remote controller. When the power supply
is turned on and indoor unit receives the first signals from the remote controller, the remote controller number is designated as the indoor unit number. Therefore at and after the second time indoor unit accepts the remote controller of
the initial setting number.
At setting - error, turn the power supply off to cancel the individual operation and then turn the power supply on to
restart the setting.
10-5. REMOTE CONTROLLER (How to set the type)
This remote controller setting needs to be switched according to the type of air conditioner (COOL & HEAT or COOL
ONLY).
If the setting is incorrect, the air conditioner does not operate normally. Therefore, check if the setting corresponds to
the type of air conditioner. If it does not, correct the setting as shown below.
10-6. MU TYPE / MUH TYPE SWITCH OVER AND AUTO RESTART FUNCTION
1. MU TYPE / MUH TYPE SWITCH OVER
The indoor units for MU type and MUH type are
common specifications. Set switch on the indoor electronic control P.C. board according to the type of outdoor unit.The units are set for MUH type when they
are shipped from the factory.
How to switch over MU TYPE / MUH TYPE
! Turn off the main power for the unit.
@ Pull out the electronic control P.C. board(Refer to
page59.), and change switch(SW2-2) on the
indoor electronic control P.C. board according to
the type of outdoor unit as following figures.
NOTE:•If the indoor-outdoor connecting wire is incorrectly
connected on the terminal block, the unit does not
operate normally.
•If a ground is incorrect, it may cause an electric shock.
46
Page 47
2. AUTO RESTART FUNCTION
1 2
SW2
1 2
1 2
SW2
1 2
AUTO RESTART
FUNCTION OFF
Set 1 switch upside.
AUTO RESTART
FUNCTION ON
Set 1 switch downside.
When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed
are memorized by the indoor electronic control P.C.board. The “AUTO RESTART FUNCTION” sets to work the
moment power has restored after power failure. Then, the unit will restart automatically. However if the unit is operated
in “I FEEL CONTROL” mode before power failure, the operation is not memorized. In “I FEEL CONTROL” mode, the
operation is decided by the initial room temperature. “AUTO RESTART FUNCTION” is OFF when the units are
shipped from the factory.
How to set “AUTO RESTART FUNCTION”
! Turn off the main power for the unit.
@ Pull out the electronic control P.C. board, and change switch(SW2-1) on the indoor electronic control P.C. board
as follow figures.
Operation
! If the main power (230V AC) has been cut, the operation settings remain.
@ After the power is restored, the unit restarts automatically according to the memory.(However, it takes at least 3
minutes for the compressor to start running.)
NOTE:
•The operation settings are memorized when 10 seconds have passed after indoor unit was operated with the remote
controller.
•If the main power is turned off or a power failure occurs while AUTO START/STOP timer is active, the timer setting is
cancelled.
•If the unit has been off with the remote controller before power failure, the auto restart function does not works as the
power button of the remote controller is off.
•To prevent breaker off due to the rush of starting current, systematize other home appliance not to turn on at the
same time.
•When some air conditioners are connected to the same supply system, if they are operated before power failure, the
starting current of all the compressors may flow simultaneously at restart.
Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current by adding to the system that allows the units to start one by one.
47
Page 48
11
Lead wiring
Housing point
Insert the minus pole
of the batteries first.
Check if the polarity of
the battereis is correct.
HEAT
/ FAN
/
RESET button
HEAT
/ FAN
/
TROUBLESHOOTING
MSC-C07TV MSC-C09TV MSC-C12TV -
E1
MU-C07TV -
E1
MU-C09TV -
E1
MU-C12TV -
E1
MUH-C07TV -
E1
MUH-C09TV -
E1
MUH-C12TV -
E1
E1
E1
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 servicing.
1) Before servicing the air conditioner, be sure to first turn off the remote controller to stop the main unit, 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.
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) Before servicing check that the connector and terminal are connected properly.
3) 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.
4) When troubleshooting, refer to the flow chart on page 49 and the check table on page 50.
4. How to replace batteries
Weak batteries may cause the remote controller malfunction.
In this case, the remote controller can be repaired only by the battery replacement. To operate the remote controller normally, replace the batteries in the following order.
This remote controller has the RESET button. After refilling new batteries, press the RESET button with tip end of ball
point pen or the like, and then use the remote controller.
1 Remove the front lid and insert batteries.
2 Press the RESET button.
Then reattach the front lid.
NOTE : If the RESET button is not pressed, the remote controller may not operate correctly.
48
Page 49
11-2. Instruction of troubleshooting
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Indoor unit
doesn't receive
the signal from
remote controller.
OPERATION INDICATOR
lamp on the indoor unit is
flashing on and off.
Outdoor unit
operates in
only Test Run
operation.
Outdoor unit
doesn't
operate
even in
Test Run
operation.
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
"Test point
diagram and
voltage" on
page 57.
Refer to D
"Check of
outdoor unit"
on page 54
and 55.
Refer to B
"Check of
remote controller
and power
monitor, receiver
P.C. board"
on page 53.
Flash on and
off at
0.5-second
intervals
Cause:
Indoor/
Outdoor unit
• Mis-wiring
2-time flash
Cause:
Indoor unit
• Trouble of
room temp erature/
indoor coil
thermistor
3-time flash
Cause:
Indoor unit
• Trouble of
indoor fan
motor
W2.
6-time flash
Cause:
Outdoor unit
• Trouble of
thermistor
in outdoor
unit
Refer to E "How to check
mis-wiring and serial signal
error(When outdoor unit
doesn't work)"
on page 56. W1.
Check room
temperature
thermistor
and indoor
coil thermistor.
Refer to
"Test point
diagram and
voltage"
on page 57.
Refer to A
"Check of
indoor fan
motor"
on page 53.
Check defrost
thermistor.
Refer to
"Test point
diagram and
voltage" on
page 58.
1. Check indoor /
outdoor
connecting wire.
2. Refer to C
"Check of indoor
electronic control
P.C. board"
on page 54.
1-time flash
Cause:
Indoor/
Outdoor unit
• Trouble of
serial signal
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”.
W2.
This indication is only for MUH-C07/C09/C12TV -
E1 .
49
Page 50
1. troubleshooting check table
Operation
Indicator
flashing
NOTE: W This indication is only for MUH-C07/C09/C12TV -
E1 .
· Flashing of the OPERATION INDICATOR lamp (on the left-hand side) indicates possible
abnormalities.
· The OPERATION INDICATOR lamp (on the left-hand side) is lighting during normal operation.
❈ Before taking measures, make sure that the symptom reappears, for accurate troubleshooting.
Self check table
NO.
Abnormal
point
Indication
Symptom
Detect method
Check point
Mis-wiring
1
Serial
signal
Indoor coil
thermistor
2
Room
temperature thermistor
Indoor fan
3
motor
0.5-second ON
0.5-second OFF
1-time flash
2.5-second OFF
2-time flash
2.5-second OFF
3-time flash
2.5-second OFF
Outdoor unit
does not run.
Outdoor unit
does not run.
Indoor fan motor
repeats 12 seconds ON and 3
minutes OFF.
When the indoor
fan motor
breaks, the fan
keeps stopping.
When serial signal stops for 4
to 5 seconds after 1st on of
52C relay by POWER turning
on.
When serial signal from outdoor unit stops for 4 to 5 seconds.
Detect Indoor coil/room temperature thermistor short or
open circuit every 8 seconds
during operation.
When rotational frequency
feedback pulse signal is not
emit during 12-second indoor
fan operation.
● Check switch SW2-2.(MU type or MUH
type)
● Check wiring (visual check and conductivity check).
● Check indoor electronic control
P.C.board.
● Check outdoor DEICER P.C. board.
● Check electrical parts.
● Check resistance of thermistor.
● Reconnect connector.
● Check indoor electronic control P.C.board.
● Disconnect connector CN211 and then
check connector CN121 - to make
sure rotational frequency feedback signal
of 1.5V or over exists.
● Check indoor electronic control P.C.
board.
● Check indoor fan motor.
● Reconnect connector.
2
3
4
Defrost
thermistor
W
6-time flash
2.5-second OFF
Outdoor unit
does not run.
When the defrost thermistor
shorts or opens after the compressor start-up.
● Check outdoor DEICER P.C. board.
● Check resistance of thermistor.
● Reconnect connector.
50
Page 51
2. Trouble criterion of main parts
RED
BLK
YLW
GRY
BRN
WHT
FUSE
RED
YLW
BRN
ORN
GRN
ROTOR
MSC-C07TV MSC-C09TV MSC-C12TV -
E1
E1
E1
Part name
Room
temperature
thermistor(RT11)
Indoor coil
thermistor(RT12)
Indoor fan
motor(MF)
Vane motor(MV)
Check method and criterion
Measure the resistance with a tester.
(Part temperature 10°C ~ 30°C)
Normal
MSC-C07/C09/C12TV
8kΩ ~ 20kΩ
Measure the resistance between the terminals with a tester.
(Coil wiring temperature10°C ~ 30°C)
Normal
MSC-C07/C09/C12TV
Motor partSensor part
BLK-RED
280 ~ 304ΩWHT-BLK
311 ~ 338Ω
Measure the voltage Power ON.
Normal
MSC-C07/C09/C12TV
BRN-YLW
YLW-GRY
4.5 ~ 5.5V
(When fan revolved one time)
0V➔5V➔0V
(Approx.)
Measure the resistance between the terminals with a tester.
(Part temperature10°C ~ 30°C)
Normal
MSC-C07/C09/C12TV
282 ~ 306Ω
Abnormal
Open or
short-circuit
Figure
Abnormal
Open or
short-circuit
Abnormal
Open or
short-circuit
Abnormal
Remain 0V or 5V
51
Page 52
P
R
C
S
RED
BLK
WHT
MAINAUX.
WHTRED
BLK
MAIN
AUX.
P
MU-C07TV MU-C09TV MU-C12TV -
Part name
Defrost
thermistor(RT61)
<MUHC07/C09/C12TV>
Compressor
(MC)
E1
MUH-C07TV -
E1
MUH-C09TV -
E1
MUH-C12TV -
E1
E1
E1
Check method and criterion
Measure the resistance with a tester.
(Part temperature –10°C ~ 40°C)
Normal
MUH-C07/C09/C12TV
5kΩ ~ 60kΩ
short-circuit
Measure the resistance between the terminals with a tester.
(Coil wiring temperature –10°C ~ 40°C)
Normal
MU-C12TV
1.98~2.43Ω
3.59~4.39Ω
C-R
C-S
MU-C07TV
3.68~4.51Ω
5.08~6.22Ω
MU-C09TV
3.55~4.35Ω
5.03~6.16Ω
Normal
MUH-C12TV
1.98~2.43Ω
3.59~4.39Ω
C-R
C-S
MUH-C07TV
3.68~4.51Ω
5.08~6.22Ω
MUH-C09TV
2.91~3.56Ω
5.11~6.26Ω
Figure
Abnormal
Open or
Abnormal
Open or
short-circuit
Abnormal
Open or
short-circuit
Outdoor fan
motor(MF)
Measure the resistance between the terminals with a tester.
(Coil wiring temperature –10°C ~ 40°C)
Normal
MU-C12TV
155 ~ 191Ω
363 ~ 445Ω
short-circuit
WHT-BLK
BLK-RED
MU-C07/C09TV
227~279Ω
339~416Ω
Normal
MUH-C09/C12TV
155 ~ 191Ω
363 ~ 445Ω
short-circuit
WHT-BLK
BLK-RED
MUH-C07TV
227~279Ω
339~416Ω
Abnormal
Open or
Abnormal
Open or
P INNER PROTECTOR
52
Page 53
A
Check of indoor fan motor
Indoor fan motor doesn’t operate.
No
Reconnect the lead wires.
Check of remote controller and power monitor, receiver P.C. board
B
Are lead wires connected?
Disconnect lead wires from connector CN211 on the indoor electronic control P.C. board.
Measure resistance between lead wires No.1 and No.3 and then No.2 and No.3.
Turn OFF the power supply.
Check connector CN211 visually.
Yes
Is resistance 0 (short circuit) or ∞ (open circuit)?
Yes ( 0 or ∞ )
Repair or replace the indoor fan motor.
Is soldered point of the connector
correctly soldered?
Yes
Replace the indoor electronic control P.C. board.
No
(others)
No
Resolder it.
Indoor unit operates by pressing the EMERGENCY OPERATION switch, but doesn’t operate with the remote
controller.
wCheck the remote controller is exclusive for this air conditioner.
wIn case of replacing the power monitor, receiver P.C. board, replace the indoor electronic control P.C. board with it because
they are unified.
Switch on the remote controller.
Is LCD display on the remote controller visible?
Yes
Remove batteries, then set them back and
press the RESET button.
Check if the unit operates with the remote
controller.
Does the unit operate with the
remote controller?
Yes
OK
No
(not clear)
No
Replace the batteries.(Refer to page 48.)
Turn on a radio to AM and press switch on
the remote controller.
Is noise heard from radio?
Yes
No
Replace the remote controller.
Are there any fluorescent lights of
inverter or rapid-start type within
the range of 1m?
No
Replace the indoor electronic control P.C.
board with power monitor, receiver P.C.
board.
53
Yes
• Re-install the unit away from lights.
• Attach a filter on receiving part.
Page 54
Check of indoor electronic control P.C. board
Check both “parts side”
and “pattern side” of
indoor electronic control
P.C. board visually.
Replace the fuse.
Is fuse(F11) blown?
Be sure to check both fuse
and varistor in any case.
Replace the fan motor.
Replace the indoor
electronic control
P.C. board.
Is winding resistance
of fan motor 0 "?
Is winding resistance
of vane motor 0 "?
No
Yes
Replace the vane motor.
No
Yes
Yes
Is varistor(NR11) burnt?
Replace the varistor.
Yes
Turn OFF the power supply.
Remove indoor fan motor connector CN211 and vane motor connector CN151
from the indoor electronic control P.C. board and turn ON the power supply.
No
No
Does the unit operate with the remote controller?
Does the OPERATION INDICATOR lamp light up
by pressing the EMERGENCY OPERATION switch?
No
Yes
Be sure to check both resistance.
Turn OFF the
power supply.
Turn OFF the
power supply.
Start
No
Check the voltage to terminal block of
outdoor unit. Is there 230V AC to terminal
block between
L-N?
Turn on the indoor power supply.
Press the EMERGENCY OPERATION switch.
3-minute time delay works.
Test run operation operates for 30 minutes.
No
Yes
Yes
Check the outdoor power supply, power
supply cord and connection.
Check the voltage to terminal block of
outdoor unit. Is there 12V DC to terminal
block between
1-2?
Yes
Outdoor unit does not
operate.
Is the connection of wiring
in outdoor unit correct?
Check the contactor(52C),
outdoor fan motor and
compressor.
Make the connection of
wiring in outdoor unit
correct.
No
Check the voltage to terminal block of
indoor unit. Is there 12V DC to terminal block
between
1-2?
Check the continuity of indoor and
outdoor unit connection.
Yes
Check the indoor electronic
control P.C. board.
Compressor
does not operate.
No
Yes
Is the connection of wiring
from terminal block to
compressor correct ?
Check the compressor.
Refer to page 52.
Make the connection of
wiring from terminal block
to compressor correct .
Outdoor fan motor
does not operate.
No
Yes
Is the connection of wiring
from terminal block to
outdoor fan motor correct ?
Check the outdoor fan motor.
Refer to page 52.
Make the connection of
wiring from terminal block
to outdoor fan motor
correct .
Is fuse "F"(2A) blown?
Yes
Replace the fuse "F"(2A).
Yes
No
No
Does outdoor unit operate?
Yes
Ok
No
Does outdoor unit operate?
Ok
Yes
Does outdoor unit operate?
Ok
Yes
No
No
C
The unit doesn’t operate with the remote controller.
Also, the OPERATION INDICATOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch.
D
Check of outdoor unit
Compressor and / or outdoor fan motor doesn’t operate.
<MU-C07/C09/C12TV>
54
Page 55
<MUH-C07/C09/C12TV>
Start
Check the voltage to terminal block of
outdoor unit. Is there 230V AC to
terminal block between
L-N?
Yes
Outdoor unit does not
operate.
Compressor
does not operate.
Outdoor fan motor
does not operate.
No
Check the outdoor power supply,
power supply cord and connection.
Is the switch(SW2-2) on the
indoor electronic control
P.C. board set to MUH type?
Change the switch
(SW2-2) on the indoor
electronic control P.C.
board to MUH type.
Refer to page 46.
Is the connection of
wiring from terminal block
to compressor correct?
Make the connection of
wiring from terminal
block to compressor
correct.
Is the connection of wiring
from terminal block to
outdoor fan motor correct?
Make the connection
of wiring from terminal
block to outdoor fan
motor correct.
No
No
No
Replace the DEICER
P.C. board.
Yes
Check the DEICER P.C.
board. Refer to page 58.
Is it normal?
Does outdoor unit operate?
Replace the compressor.
Check the compressor.
Yes
Refer to page 52.
Is it normal?
Does outdoor unit operate?
Replace the outdoor
fan motor.
Check the outdoor fan
Yes
motor. Refer to page 52.
Is it normal?
Does outdoor unit operate?
No.
No.
No.
No.
No
No
Check the compressor
Yes
and outdoor fan motor.
Refer to page 52.
Yes
Ok
Check the DEICER
Yes
P.C. board.
Refer to page 58.
Yes
Ok
Check the DEICER
Yes
P.C. board.
Refer to page 58.
Yes
Ok
55
Page 56
How to check mis-wiring and serial signal error
E
Outdoor unit doesn’t operate.
Start
Turn OFF the power supply(indoor/outdoor unit).
w1 Set the switch(SW2-2) on the indoor electronic control P.C.
board to MU type, when the outdoor unit is MU type.
If the setting is MUH type, the unit does not work.
w2 Short circuit of JPG and JPS on the indoor electronic control
P.C. board enables self -check to be displayed in 3 seconds.
Is the outdoor unit "MUH" type?
Yes
•Turn ON the power supply(indoor/outdoorunit).
•Press once EMERGENCY OPERATION switch.
3 min. later, what self-check result is
displayed on OPERATION INDICATOR
lamp on indoor unit?
w2
No
Serial signal error is indicated.
(0.5-sec. ON, 2.5-sec. OFF)
Set the switch(SW2-2) on the indoor electronic
control P.C. board to MU type. (Refer to page 46.)
Mis-wiring is indicated.
(0.5-sec. ON, 0.5-sec. OFF)
Make them sure.
Yes
Is this mis-wiring, poor contact,
or wire disconnection?
No
1. Turn OFF the power supply(indoor/outdoor unit) and disconnect in-out 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
R132 on 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 in-out connecting wire.
Turn ON the power supply(outdoor unit).
No
Replace the indoor electronic
control P.C. board.
Does the unit operate?
No
Follow the chart
on page 49.
Yes
w1
Ok
Is there 230V AC between outdoor
terminal block
Is there 5V DC between J8
(Refer to page 58.)
Turn ON the power supply(indoor unit).
During EMERGENCY OPERATION,
is there 10V DC between both ends
of R601? (Refer to page 58.)
(By tester, the stylus is between 5 ~10V)
Replace the DEICER P.C. board.
L-N?
Yes
- -J9 + ?
Yes
Yes
56
Check the outdoor power supply,
No
power supply cord and
connection.
No
Replace the DEICER P.C. board.
Make the wiring between CN730
No
on the DEICER P.C. board and
outdoor terminal block correct.
(Refer to page 58.)
Page 57
TEST POINT DIAGRAM AND VOLTAGE
0
0
10 20 30 40 50 60
MSC-C07TV MSC-C09TV MSC-C12TV -
Indoor electronic control P.C. board
E1
E1
E1
R132
12V DC
Varistor (NR11)
--
{
+
Fuse 250V AC 3.15A
Indoor fan motor
230V AC
}
Power supply input
}
230V AC
Room
temperature
thermistor (RT11)
Timer short mode
point (JPG, JPS)
(Refer to page 45.)
Indoor coil
thermistor (RT12)
SW2 (Refer to page 46.)
1 sets the Auto restart function ON/ OFF.
2 switches over MU type/ MUH type.
57
Emergency
operation switch
+
5V DC
}
--
Indoor coil thermistor (RT12)
Room temperature thermistor (RT11)
)
''
Resistance (k
Temperature (;;)
Page 58
MUH-C07TV MUH-C09TV MUH-C12TV -
Outdoor deicer P.C. board
Outdoor fan motor
230V AC
}
E1
E1
E1
R.V .coil
230V AC
}
R601
5~10V DC
}
+
CN730
Power supply input
230V AC
}
Defrost thermistor(RT61)
}
}
12V DC
Fuse 2A/250V
Defrost interval time
short pin
(JP607, R853)
(Refer to page 45.)
+
J9
5V DC
}
J8
+
+
}
52C
12V DC
Jumper wire for change in
defrost setting (JPC)
(Refer to page 45.)
58
Page 59
12
(1) Slide the sleeve and check if there is a locking lever or not.(2) The terminal with this connector is a terminal
with lock mechanism.
1Slide the sleeve.
2Pull the terminal while
pushing the locking
lever.
1Hold the sleeve, and
pull out the terminal
slowly.
In case of terminal with lock mechanism, detach the terminal as shown below.
There are two types ( Refer to (1) and (2)) of the terminal with lock mechanism.
The terminal with no lock mechanism can be removed by pulling it out.
Check the shape of the terminal and work.
<"Terminal with lock mechanism" Detaching points>
Connector
Sleeve
Locking lever
DISASSEMBLY INSTRUCTIONS
12-1. MSC-C07TV -MSC-C09TV -MSC-C12TV -
E1E1E1
INDOOR UNIT
OPERATING PROCEDUREPHOTOS
1. Removing the front panel
(1) Remove the screw caps of the front panel.
Remove the screws.
(2) Pull the panel down to your side slightly and unhook the
catches at the top.
2. Removing the electronic control P.C. board and the
power monitor, receiver P.C. board
(1) Remove the front panel. (Refer to 1)
(2) Remove the screw of the electrical cover.
Remove the electrical cover.
(3) Remove the V.A. clamp.
(4) Remove the cord clamp.
(5) Remove the screw of the terminal block.
(6) Remove the screw of the ground wire.
(7) Disconnect all the connectors and all the lead wires on the
electronic control P.C. board.
(8) Remove the R.L holder.
(9) Remove the electronic control P.C. board.
(10)
Open the R.L holder and the power monitor, receiver P.C.
board.
59
Photo 1
Front panel
Screws
Photo 2
Screw of the
V.A. clamp
Screw of the ground wire
R.L holder
Power monitor,
receiver P.C. board
Fan motor connector
V.A. clamp
Room temperature
thermistor connector
Indoor electronic
control P.C.board
Vane motor
connector
Cord clamp
Page 60
OPERATING PROCEDUREPHOTOS
3. Removing the electrical box
(1) Remove the front panel. (Refer to 1)
(2) Remove the electrical cover. (Refer to 2)
(3) Disconnect the connector of the indoor coil thermistor.
(4) Disconnect the motor connector (CN211 and CN121) and
the vane motor connector (CN151) on the electronic
control P.C. board.
(5) Remove the screw of ground wire.
(6) Remove the fan motor lead wire and indoor coil thermistor
from the electrical box.
(7) Remove the lead wire of vane motor from the bottom of
electrical box.
(8) Remove the screw fixing the electrical box, remove the
electrical box.
4. Removing the vane motor
(1) Remove the front panel.
(2) Remove the electrical box. (Refer to 3)
(3) Pull out the drain hose from the nozzle assembly, remove
the nozzle assembly.
(4) Remove the screws (both upper and lower) of the vane
motor, disconnect the connector.
(5) Remove the vane motor.
Photo 3
Screw of the
electrical box
Photo 4
Screws of the
vane motor
Drain hose
5. Removing the line flow fan and the indoor fan motor
(1) Remove the front panel. (Refer to 1)
(2) Remove the electrical box. (Refer to 3)
(3) Pull out the drain hose from the nozzle assembly, remove
the nozzle assembly.
(4) Remove the hexagon socket set screw from the line flow
fan.
(5) Remove the screws fixing the fan motor, remove the fan
motor.
(6) Remove the screws fixing the left side of the heat
exchanger.
(7) Lifting the left side of the heat exchanger.
(8) Remove the line flow fan.
Vane motor
Photo 5
Screws fixing the left
side of the
heat
exchanger
Indoor coil
thermistor
60
Screws of the
fan motor
Page 61
12-2. MU-C07TV -MU-C09TV -MU-C12TV -
OUTDOOR UNIT
OPERATING PROCEDUREPHOTOS
E1E1E1
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.
Photo 3
Screws of the
service panel
Screws of the
top panel
Service
panel
Photo 1
Screws of the front panel and motor support
Screws
of the
cabinet
Screws of the cabinet
Photo 2
Screws of the
top panel
2. Removing the electrical parts
(1) Remove the service panel and the cabinet.(Refer to 1)
(2) Remove the following parts.
•Compressor capacitor (C1)
•Outdoor fan capacitor (C2)
•Terminal block (TB)
Photo 4
Relay panel
Compressor
capacitor(C1)
Screws of the
cabinet
Screws
61
Screw
Contactor
Outdoor fan capacitor(C2)
Terminal block
(TB)
Page 62
OPERATING PROCEDUREPHOTOS
3. Removing the propeller fan and the outdoor fan
motor
(1) Remove the cabinet. (Refer to 1)
(2) Remove the propeller fan nut.
(3) Remove the propeller fan.
NOTE : Loose the propeller fan in the rotating direction for
removal.
When attaching the propeller fan, align the mark on the
propeller fan and the motor shaft cut section.
Set the propeller fan in position by using the cut on the
shaft and the mark on the propeller fan.
(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 5
Set screws of the
outdoor fan motor
Propeller fan
Hook
Lead clamps
Outdoor
fan motor
connector
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.
(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
NOTE
● Before using a burner, reclaim gas from the pipes until the
pressure gauge shows 0 kg/cm
● Use the burner under the condition that gas can be recovered
even when the inner pressure rises by heat.
2
(0MPa).
Propeller fan nut
Photo 6
Discharge pipe
Glass
terminal
Compressor
Outdoor
fan motor
Suction pipe
62
Terminal cover
Compressor
set nuts
Page 63
12-3. MUH-C07TV -MUH-C09TV -MUH-C12TV -
OUTDOOR UNIT
OPERATING PROCEDUREPHOTOS
E1E1E1
1. Removing the cabinet
(1) Remove the screws of the top panel.
(2) Remove the screws 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.
Photo 3
Screws of the
service panel
Screws of the
top panel
Service
panel
Photo 1
Screws of the front panel and motor support
Screws
of the
cabinet
Screws of the cabinet
Photo 2
Screw of the
top 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.
Photo 4
Deicer
P.C. board
Screws for
cabinet
Screws
63
Screw
Relay panel
Terminal
block(TB)
Page 64
OPERATING PROCEDUREPHOTOS
3. Removing the propeller fan and the outdoor fan
motor
(1) Remove the cabinet. (Refer to 1)
(2) Remove the propeller fan nut.
(3) Remove the propeller fan.
NOTE : Loose the propeller fan in the rotating direction for
removal.
When attaching the propeller fan, align the mark on the
propeller fan and the motor shaft cut section.
Set the propeller fan in position by using the cut on the
shaft and the mark on the propeller fan.
(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 5
Set screws of the
outdoor fan motor
Propeller fan
Hook
Lead clamps
Outdoor
fan motor
connector
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.
(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
NOTE
● Before using a burner, reclaim gas from the pipes until the
pressure gauge shows 0 kg/cm
● Use the burner under the condition that gas can be recovered
even when the inner pressure rises by heat.
LINE FLOW FAN
BEARING MOUNT
SLEEVE BEARING
DRIAN HOSE
NOZZLE (WH)
VANE UPPER (WH)
VANE LOWER (WH)
FUSE
VARISTOR
VANE CLANK SET
POWER SUPPLY CORD
ELECTRONIC CONTROL P.C.BOARD
ELECTRONIC CONTROL P.C.BOARD
ELECTRONIC CONTROL P.C.BOARD
VANE MOTOR
ROOM TEMPERATURE THERMISTOR
INDOOR FAN MOTOR
TERMINAL BLOCK
FAN MOTOR RUBBER MOUNT
INDOOR COIL THERMISTOR
13-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS
19 (W)
13-4. INDOOR UNIT HEAT EXCHANGER
66
Page 67
13-5. OUTDOOR UNIT STRUCTURAL PARTS
MU-C07TV MU-C09TV MU-C12TV -
E1
E1
E1
1
12
11
10
2
3
4
5
6
78
9
Part number that is circled is not shown in the illustration.
No.
E02 336 297
1
E02 336 630
2
E02 336 232
3
E02 336 521
4
E02 621 900
E02 622 900
5
E02 515 900
E02 336 506
6
E02 075 506
E02 339 290
7
E02 340 290
E02 621 661
8
E02 623 661
E02 621 662
9
E02 336 245
10
E02 339 233
11
E02 440 233
E02 336 515
12
E02 339 936
E02 023 936
13
E02 412 936
Part No.
TOP PANEL
OUTDOOR HEAT EXCHANGER
CABINET
GRILLE
COMPRESSOR
COMPRESSOR
COMPRESSOR
COMPRESSOR RUBBER SET
COMPRESSOR RUBBER SET
BASE
BASE
STOP VALVE(GAS)
STOP VALVE(GAS)
STOP VALVE(LIQUID)
SERVICE PANEL
BACK PANEL
BACK PANEL
MOTOR SUPPORT
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
PROPELLER FAN
OUTDOOR FAN MOTOR
OUTDOOR FAN MOTOR
OUTDOOR FAN CAPACITOR
COMPRESSOR CAPACITOR
COMPRESSOR CAPACITOR
TERMINAL BLOCK
TERMINAL BLOCK
CONTACTOR
FUSE
SURGE ABSORBER
RA6V23RA6V33-
1.5+ /440VAC
25+ /440VAC
30+ /440VAC
3P
2P
250V/2A
MF
MF
C2
C1
C1
TB1
TB2
52C
F
DSAR
1
1
1
1
1
1
1
1
1
MU-C12TV-
E1
MU-C07TV-
E1
MU-C09TV-
E1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
MU-C07TV MU-C09TV MU-C12TV -
E1
E1
E1
13-6. OUTDOOR UNIT
FUNCTIONAL PARTS AND
ELECTRICAL PARTS
6
5
12
Part numbers that are circled are not shown in the illustration.
68
3
4
Page 69
13-7. OUTDOOR UNIT STRUCTURAL PARTS
MUH-C07TV MUH-C09TV MUH-C12TV -
1
2
3
4
E1
E1
E1
13
1112
Part numbers that are circled are not shown in the illustration.
No.
1
E02 336 297
E02 440 630
2
E02 628 630
3
E02 336 232
4
E02 336 521
E02 513 900
5
E02 514 900
E02 515 900
E02 336 506
6
E02 075 506
E02 339 290
7
E02 340 290
E02 621 661
8
E02 623 661
9
E02 627 662
10
E02 444 961
11
E02 336 245
12
E02 440 233
E02 336 515
13
E02 442 515
E02 159 936
E02 156 936
E02 139 936
14
E02 627 936
E02 408 936
E02 172 937
E02 515 937
15
E02 154 642
Part No.
TOP PANEL
OUTDOOR HEAT EXCHANGER
OUTDOOR HEAT EXCHANGER
CABINET
GRILLE
COMPRESSOR
COMPRESSOR
COMPRESSOR
COMPRESSOR RUBBER SET
COMPRESSOR RUBBER SET
BASE
BASE
STOP VALVE(GAS)
STOP VALVE(GAS)
STOP VALVE(LIQUID)
4-WAY VALVE
SERVICE PANEL
BACK PANEL
MOTOR SUPPORT
MOTOR SUPPORT
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
CHECK VALVE