This Service manual OB212 deals with MCFH-13/18/24/NV-E1,
MUCFH-13/18/24/NV-E1, MCFH-13/18/24/NV-E2 and MUCFH13/18/24/NV-E2 in OB196 REVISED EDITION A issued in
September in 1997.
Therefore, please refer to OB212, not to OB196 REVISED EDITION A, for the above models.
13. PARTS LIST······················································63
14. OPTIONAL PARTS ···········································70
E4E4
E3E3
E3E3
W As for parts lists, all sub number’s series are included.
Page 2
Page 3
1
(When installed on the floor)
(When the air inlet grille is opened.)
Deodorizing filter
(gray sponge type)(option)
Air filter
Air inlet
Operation section
Air cleaning filter
(white bellows type)(option)
Front panel
Receiving section
Operation indicator lamp
Horizontal vane
Vertical vane
Emergency
operation switch
(When installed on the ceiling)
ACCESSORIES
Item
Installation plate
Unit fixing screw
5 o 12mm
Wireless remote
controller
Remote controller
mounting hardware
Fixing screw for
3.5 o 16mm (Black)
Battery (AAA) for
remote controller
Drain hose
Drain pipe cover
Knockout cover
Screw for 4 o 10mm
2
2
1
1
2
2
1
1
1
2
Q'ty
Remote controller
TECHNICAL CHANGES
MCFH-13NV-· MUCFH-13NV-➔MCFH-13NV-· MUCFH-13NV-
1. Remote controller has changed.
SWING button is removed, but SWING MODE function is available by VANE CONTROL button.
MCHF-18NV-· MUCFH-18NV-➔MCFH-18NV-· MUCFH-18NV-
1. Remote controller has changed.
SWING button is removed, but SWING MODE function is available by VANE CONTROL button.
MCFH-24NV-· MUCFH-24NV-➔MCFH-24NV-· MUCFH-24NV-
1. Remote controller has changed.
SWING button is removed, but SWING MODE function is available by VANE CONTROL button.
2. Ball valve has changed to stop valve.
3. Deicer P.C. board has changed.
2
MCFH-13NV MCFH-18NV MCFH-24NV -
PART NAMES AND FUNCTIONS
E4
E3
E3
E4E4E3E3
E3E3E2E2
E3E3E2E2
INDOOR UNIT
3
Page 4
OUTDOOR UNIT
MUCFH-13NV -
MUCFH-18NV -
E4
Air inlet
(back and side)
Piping
Drain hose
Air outlet
Drain outlet
E3
MUCFH-24NV -
Air inlet
Piping
Drain hose
Air outlet
Drain outlet
E3
Air outlet
Air inlet
4
Page 5
ON/OFF
TOO
COOL
PM
AM
TOO
WARM
ON/OFF
FAN
TOO
WARM
TOO
COOL
VANE
MODE
STOP
START
HR.
MIN.
I FEEL
COOL
HEAT
DRY
PM
CLOCK
AM
RESET CLOCK
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
VANE CONTROL button
CLOCK SET button
MCFH-13NV MCFH-18NV MCFH-24NV -
REMOTE CONTROLLER
E4
E3
E3
5
Page 6
3
Indoor model
Function
Power supply
Capacity
Air flow(High)
Dehumidification
Power outlet
Running current
Power input
Auxiliary heater
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
Air flow
Compressor motor current
Fan motor current
Model
Output
Winding
resistance(at20:)
Model
Winding
resistance(at20:)
Dimensions WOHOD
Weight
Sound level(High)
Fan speed(High)
Fan speed regulator
Refrigerant filling
capacity(R22)
Refrigerating oil (Model)
Thermistor RT61(at0:)
Thermistor RT63(at0:)
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 page 16 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
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 wetand-dry-bulb termometers 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.
INDOOR UNIT
11.7
10.7
9.7
8.7
7.8
6.9
25.2
23.3
21.3
19.4
17.5
15.5
13.6
11.6
14.7
13.4
12.1
10.9
MCFH-18NV- E3
29.0
26.7
24.5
22.3
20.0
17.8
15.6
13.4
9.3
8.6
7.8
7.1
6.3
5.6
MCFH-13NV- E4
20.1
18.6
17.0
15.5
13.9
12.4
10.8
9.3
OUTDOOR UNIT
9.7
8.5
MCFH-24NV- E3
MCFH-18NV- E3
MCFH-13NV- E4
MCFH-24NV- E3
16
Page 17
OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT
1832
506070 (%)
Ambient temperature (:)
Ambient humidity (%)
Outdoor low pressure
506070 (%)
Ambient temperature (:)
Ambient humidity (%)
Outdoor unit current (A)
(MPa•G)
(kgf/F• G)
15202530 35(:)
0.3
0.4
0.5
0.6
0.7
0.8
15202530 35(:)
3
4
5
6
7
8
220-240V220-240V
1832
7
8
5
6
4
3
0.7
0.6
0.5
0.4
0.3
0.2
15 18 202530 32 35(:)
506070 (%)
Ambient temperature (:)
Ambient humidity (%)
Outdoor low pressure
10
9
8
7
6
5
15 18 202530 32 35(:)
506070 (%)
Ambient temperature (:)
Ambient humidity (%)
Outdoor unit current (A)
240V
220V
(MPa•G)
7
6
4
3
2
5
(kgf/F• G)
220-240V
Ambient temperature (:)
Ambient humidity (%)
240V
220V
13
12
11
10
9
8
7
15 18 202530 32 35(:)
506070 (%)
Ambient temperature (:)
Ambient humidity (%)
Outdoor unit current (A)
0.7
0.6
0.5
0.4
0.3
0.2
15 18 202530 32 35(:)
506070 (%)
Outdoor low pressure
(MPa•G)
7
6
4
3
2
5
(kgf/F• G)
220-240V
COOL operation
1 Both indoor and outdoor units are under the same temperature/humidity condition.
Dry Bulb temperature (˚C)
20
25
30
2 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 converted score against the traditional unit system can be gotten according to the formula below.
Difference
between set
temperatuer
and room
temperature
This shows that the air
conditioner is operating
to reach the target temperature.
Please wait until the
target temperature is
obtained.
This shows that the
room temperature is
approaching the target
temperature.
lighted
not lighted
Approx. 2 :
or more
Approx. 2 :
or less
Operation Indicator
OPERATION INDICATOR
lamp
The operation indicator at the right side of the indoor
unit indicates the operation state.
MICROPROCESSOR CONTROL
MCFH-13NV -MCFH-18NV MCFH-24NV -
E3
WIRELESS REMOTE CONTROLLER
INDOOR UNIT DISPLAY SECTION
E3E4
MUCFH-13NV -MUCFH-24NV MUCFH-18NV -
E3
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.
9-1. “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”
OPERATION SELECT button.
(3) The operation mode is determined by the room tem-
perature at start-up of the operation.
Initial room temperature
25: or more
23:to 25:
less than 23:
● 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 operation starts.
● When the system is stopped with the
OPERATE/ STOP(ON/OFF) button 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.
Example
Previous operation
COOL mode of
“I FEEL CONTROL”
or COOL mode
E3E4
() mode with the
Mode
COOL mode of
"I FEEL CONTROL"
DRY mode of
"I FEEL CONTROL"
HEAT mode of
"I FEEL CONTROL"
Restart
COOL mode of
“I FEEL CONTROL”
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.
Example
Previous operation
COOL mode of
“I FEEL CONTROL”
or COOL mode
32
Restart
COOL or DRY or
HEAT mode of “I
FEEL CONTROL” that
is determined by room
temperature at start-up
of the operation.
Page 33
(4) The initial set temperature is decided by the initial room temperature.
Model
COOL mode of
"I FEEL CONTROL"
DRY mode of
"I FEEL CONTROL"
HEAT mode of
"I FEEL CONTROL"
Initial room temperatureInitial set temperature
26:
26: or more
25: to 26:
less than 23:
23: to 25:
24:
Initial room temperature
minus 2:
Initial room temperature
minus 2:
❈1
Difference between room
temperature and set temperature
during operation
1deg. 1.7deg.
2deg. 4deg.
TOO
COOL
TOO
WARM
❈1 When the system is restarted with the remote controller, the system operates with the previous set temperature regard-
less of room temperature at restart.
The set temperature is calculated by the previous set temperature.
(5) TEMPERATURE 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 or TOO WARM or TOO COOL buttons when you feel too warm or too
cool. 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 operates at the set speed by FAN SPEED CONTROL button.
In AUTO the fan speed is as follows.
Room temperature minus set temperature : 2 degrees or more
Room temperature minus set temperature : Between 1 and 2 degrees
Room temperature minus set temperature : less than 1 degree
2. Coil frost prevention
① Temperature control
When the indoor coil thermistor RT12 reads -1°C or below, the coil frost prevention mode starts immediately.
However, the coil frost prevention doesn’t work for 5 minutes since the compressor has started.
The indoor fan operates at the set speed and the compressor stops for 5 minutes.
After that, if RT12 still reads below -1°C, this mode prolonged until the RT12 reads over -1°C.
② Time control
When the three conditions as follows have been satisfied for 1 hour and 45 minutes, compressor stops for 3 minutes.
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 and 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.
Initial temperature difference Fan Speed
······································High
···························Med.
······································Low
33
Page 34
Compressor
Outdoor fan
Indoor fan
ON
OFF
(continuously at set speed)
OFF
ON
ON
Operation chart
Example
—DRY mode of “I FEEL CONTROL”—
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 air 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.
However, in AUTO fan operation, fan speed becomes Low.
2. The operation of the compressor and indoor/ outdoor fan
Compressor operates by temperature control and time control.
Set temperature is controlled to fall 2°C from initial room temperature.
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
ON
ON
Thermostat
Indoor fan
Outdoor fan
Compressor
OFF
OFF
OFF
ON
ON
8 min.
OFF
OFF
ON
ON
3 min.
4 min.
OFF
ON
OFF
ON
OFF
1 min.
3. Coil frost prevention
• The operation is as same as coil frost prevention during COOL mode of “I FEEL CONTROL”.
• Indoor fan operates at the set speed and the compressor stops for 5 minutes, because protection (Coil frost
prevention) has the priority.
However, when coil frost prevention works while the compressor is not operating, it’s speed becomes Low.
34
Page 35
— HEAT mode of “I FEEL CONTROL” —
Difference between room
temperature and set temperature
during operation
1deg. 1.7deg.
2deg. 4deg.
Released
Cold Air Prevention
18: 22:
Fan speed
Set speed
Very Low or stop
High pressure protection
Released
48:
46:
52:
50:
ON
Outdoor fan
OFF
1. Indoor fan speed control
(1) In AUTO the fan speed is as follows.
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
(2) Cold air prevention control
The fan runs at set speed when the indoor coil thermistor RT12 temperature exceeds 22°C. The fan operates at Very
Low when the temperature of indoor coil thermistor RT12 is below 18°C. But the fan stops when the indoor fan operates
at Very Low and the room temperature is 15°C or less.
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 compressor starts in heating operation or after defrosting, the fan changes the speed due to the indoor coil thermistor RT12 temperature to blow out warm air.
After releasing of cold air prevention, when the indoor coil temperature is 37°C or above, the fan speed shifts to the set
speed, and when the fan speed is changed by the remote controller, the fan speed is the set speed.
When the indoor coil temperature is less than 37°C, the fan speed is controlled by time as below.
<Time condition> <Indoor fan speed>
less than 2 minutes························Low
2 minutes to 4 minutes···················Med.
4 minutes or more··························High
The upper limit of the fan speed is the set speed.
If the thermostat turns off, this operation changes to flow soft control.
(4) Flow soft control
After the thermostat turns off, the indoor fan operates at Very Low.
NOTE : When the thermostat turns on, the fan operates at the set speed. Due to the cold air prevention control, the fan
does not start at set speed until the indoor coil thermistor RT12 reads 22°C or more.
Initial temperature differenceFan speed
2. High pressure protection
During heating operation, the outdoor fan motor is controlled by the temperature of indoor coil thermistor RT12 temperature
for excess rise protection of compressor discharge pressure.
Outdoor fan OFF : 52°C (MCFH-13/24), 50°C (MCFH-18)
Outdoor fan ON : 48°C (MCFH-13/24), 46°C (MCFH-18)
High pressure protection chart
Example
Indoor coil thermistor
RT12 temperature
MCFH-13/24 : 52˚C
MCFH-18: 50˚C
MCFH-13/24 : 48˚C
MCFH-18: 46˚C
Outdoor fan motor
NOTE : When the outdoor fan is OFF in heating, defrosting of outdoor heat exchanger is not detected by the defrost thermistor
RT61.
ONON
OFF
35
Outdoor fan motor
turn OFF
Outdoor fan motor
turn ON
OFF
Page 36
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) The defrost thermistor RT61 reads - 3°C 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) The defrost thermistor RT61 reads 3.1°C or more.
e) The defrosting time exceeds 10 minutes.
(3) Defrosting time chart
Defrost thermistor RT61
3.1: or more
-3: or less
Outdoor 52C contactor
(Compressor)
ON
OFF
X62
R.V. coil
ON
15 sec.
30 sec.
OFF
SR61
Outdoor fan
30 sec.
5 sec.
(MCFH-24)
ON
OFF
(MCFH-13/18)
Defrost
counter
Indoor fan
ON
OFF
Max. 10 min.
NOTE1
ON
Very Low
OFF
Indoor vane
Position 1
Set
Position
NOTE: When the indoor coil thermistor reads above 18°C, indoor fan operates at Very Low for 30 seconds.
When the indoor coil thermistor reads 18°C or less, the indoor fan stops.
36
Page 37
4. 4-way valve control
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
:
Heating · · · · · ON
Cooling · · · · · OFF
Dry · · · · · · · · OFF
NOTE : The 4-way valve reverses for 5 seconds right before start-up of the compressor.
Ex. In case of power ON
with remote contrller
(COOL / DRY)
5 sec.
(HEAT)
5 sec.
Compressor
4-way valve
Outdoor fan
ON
OFF
ON
OFF
ON
OFF
9-2. COOL () OPERATION
(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 the TEMPERATURE buttons
(TOO WARM or TOO COOL button)
to select the desired temperature.
The setting range is 16 ~ 31°C
w Indoor fan continues to operate regardless of thermostat’s OFF-
ON at set speed.
w Coil frost prevention is as same as COOL mode of “I FEEL
CONTROL”.
9-3. 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.
Thermostat (SET TEMP.) does not work.
The other operations are as same as DRY mode of “I FEEL CONTROL”.
(4) DRY operation will not function when the room temperature is
13°C or below.
ON
OFF
ON
OFF
ON
OFF
9-4. HEAT () OPERATION
(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.
(4) Indoor fan speed control, high pressure protection, defrosting, reversing valve control are the same as HEAT mode of “I
FEEL CONTROL”.
37
Page 38
9-5. AUTO VANE OPERATION
4
1
1
2
3
4
5
1
2
3
4
5
SWING
AUTO
(1) Vane motor drive
This model is equipped with a stepping motor for the vane. The rotating direction, speed, and angle of the motor are
controlled by pulse signals (approx. 12V) transmitted from indoor microprocessor.
(2) Each time the VANE CONTROLbutton is pressed, angle of horizontal vane is changed in sequence, from 1, 2, 3, 4, 5
SWING to AUTO.
(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.
(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 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 position 4 or 5 when the compressor cumulative operation time exceeds 1 hour, the
angle of horizontal vane automatically changes to Position 1 for dew prevention.
(7) SWING () MODE
By selecting SWING mode with the VANE CONTROLbutton, the horizontal vane swings vertically between Position 1
and 5 in COOL and DRY operation, between Position 2 and 4 in HEAT operation.
The remote controller displays “”. If the VANE CONTROL() button is pressed during SWING mode or the operation stops or changes to other mode, SWING mode is released.
Vane angle is fixed to position 1.
Vane angle is fixed to position 4.
38
Page 39
(8) Cold air prevention in HEAT operation.
Released
Cold Air Prevention
24:28:
Position 1
Horizontal vane
Set position
PM
AM
PM
PM
When any of the following conditions occurs in HEAT operation, the angle of horizontal vane automatically changes to
Position 1 to prevent cold air blowing on users.
1 Compressor is not operating.
2 Defrosting is performed.
3 Indoor coil thermistor RT12 reads 24: or below.
4 Indoor coil thermistor RT12 temperature is raising from 24: 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.
9-6. 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-TIMER, OFF-TIMER button to select the operation.
“” button ... AUTO START operation (ON timer)
“” button ... AUTO STOP operation (OFF timer)
(4) Press HR. and MIN. button to set the timer. Time setting is 10-minute units.
HR. and MIN. button will work when “” or “” button 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 TIMER CONTROL buttons. (“” or “”)
To cancel the ON timer, press the “” button.
To cancel the OFF timer, press the “” 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 show the order of the OFF timer and ON timer operation.
(Example 1) The current timer 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.
39
Page 40
9-7. 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 / HEAT 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 too.
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 or twice or the unit receives
any signal from the remote controller. In case of latter normal operation will start.
NOTE : Do not press the EMERGENCY OPERATION switch during normal operation.
EMERGENCY
OPERATION switch
Press once <Cool>
Press again <Heat>
Press once again <Stop>
OPERATION INDICATOR lamp
9-8. AUTO RESTART FUNCTION
When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed
are memorized by the the auto restart P.C. board.
The “AUTO RESTART FUNCTION” sets to work the moment the power has restored after power failure. Then, the unit
will restart automatically. However if the unit is operated in “I FEELCONTROL” mode before power failure, the operation
is not memorized. In “I FEEL CONTROL mode”, the operation is decided by the initial room temperature.
NOTE :
•The operation settings are memorized when 10 seconds have passed after the remote controller was operated.
•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 work as the
power button of the remote controller is off.
•To prevent breaker off due to the rush of starting current, systematize other home appliances 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.
40
Page 41
SERVICE FUNCTIONS10
Jumper wire
JPC
JPE
JRF
JRG
Model
MUCFH-13NVMUCFH-18NV-
MUCFH-24NV-
Change point
Defrost interval time changes from 40 minutes to 15 minutes.
Defrost start temperature changes from -3: to 0:.
Defrost finish temperature changes from 3.1: to 10.1:.
Defrost interval time changes from 40 minutes to 15 minutes.
Defrost start temperature does not change.(-3.0:)
Defrost finish temperature changes from 3.1: to 15:.
E4
E3
E3
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
MCFH-13NV -MCFH-24NV MCFH-18NV -
E3
E3E4
MUCFH-13NV -MUCFH-24NV MUCFH-18NV -
E3
E3E4
10-1. COMPULSORY DEFROSTING MODE FOR SERVICE
By short circuit of the connector JP607 and R853 (MUCFH-13/18NV) / JPG1 ans R871 (MUCFH-24NV) on the outdoor
deicer P.C. board, defrosting mode can be accomplished regardless of the defrost interval restriction. (See Page 53 or 54.)
Defrost thermistor RT61 must read below -3:.
10-2. CHANGE IN DEFROST SETTING
MUCFH-13/18NV
<JPC> when the JPC wire of the deicer P.C. board is cut, the defrost interval time will be changed. (See page 53.)
<JPE> when the JPE wire of the deicer P.C. board is cut, the defrost temperature will be changed. (See page 53.)
MUCFH-24NV
<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 page 53.)
10-3. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board.
The time will be shortened as follows.
3-minutes time delay : 3-minutes → 3-seconds
AUTO START : 1 hour → 1-minute
AUTO STOP : 1 hour → 1-minute
Short the connector during the timer mode.
}
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;
The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in
Table 1. After modification, press the RESET button.
Table1.
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. RELEASE OF AUTO RESTART FUNCTION
Solder JHA (refer to page 52) with a jumper line on the indoor electronic control P.C. board.
Remove the auto restart assy from “Connector CN104”.
41
Page 42
11
Insert the negative pole
of the batteries first.
Check if the polarity of
the battereis is correct.
RESET button
TROUBLESHOOTING
MCFH-13NV -MCFH-24NV MCFH-18NV -
E3
E3E4
MUCFH-13NV -MUCFH-24NV MUCFH-18NV -
11-1. Cautions on troubleshooting
11-1-1. Before troubleshooting, check the followings:
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for mis-wiring.
11-1-2. Take care the followings 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.
2) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the
components.
3) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
11-1-3. 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 the flow chart and the check table on page 43, 44.
11-1-4. How to replace batteries
Weak batteries may cause the remote controller malfunction.
In this case, replace the batteries to operate the remote controller normally.
1 Remove the front lid and insert batteries.Then reattach the front lid.
2 Press the RESET button with tip end of ball point pen or the like, and then use the remote controller.
E3E4
E3
NOTE : If the RESET button is not pressed, the remote controller may not operate correctly.
42
Page 43
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 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 52.
Refer to D
"Check of
outdoor unit"
on page 47,
48.
Refer to F
"Check of
outdoor unit"
on page 50.
Refer to B
"Check of
remote controller
and receiver
P.C. board"
on page 46.
Flash on and
off at 0.5second
interval
Cause:
Indoor/
Outdoor unit
• Mis-wiring
2-time flash
Cause:
Indoor unit
• Trouble of
room temp erature/
indoor coil
temperature
thermistor
6-time flash
Cause:
Outdoor unit
• Trouble of
thermistor
in outdoor
unit
Check room
temperature
thermistor
and indoor
coil temperature thermistor.
Refer to
"Test point
diagram and
voltage"
on page 52.
Refer to H
"Check of
outdoor
thermistor"
on page 51.
MCHF-24NV only
7-time flash
Cause:
Outdoor unit
• Trouble of
outdoor
control
system
Refer the
deicer
P.C. board.
1-time flash
Cause:
Outdoor /
Indoor unit
• Trouble of
serial signal
Refer to E
"How to
check miswiring and
serial signal
error (When
outdoor unit
doesn't
work)" on
page 49.
W1
Refer to E
"How to
check miswiring and
serial signal
error (When
outdoor unit
doesn't
work)" on
page 49.
W1
1. Check indoor /
outdoor
connecting wire.
2. Refer to C
"Check of indoor
electronic control
P.C. board"
on page 47.
Outdoor unit
doesn't
stop even
if indoor unit
stops.
Unit doesn't
operate
normal
operation in
COOL or
HEAT mode.
Refer to G
"Check of
R.V. coil"
on page 50.
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”.
43
Page 44
11-2-1. troubleshooting check table
OPERATION
INDICATOR
lamp
Before taking measures, make sure that the symptom reappears, for accurate troubleshooting.
Self check table
NO.
1
Abnormal
point
Mis-wiring
Serial signal
0.5-second ON
0.5-second OFF
1-time flash
2.5-second OFF
Indication
Symptom
Outdoor unit
does not run.
Detect method
When serial signal stops for 4
to 5 seconds after 1st on of
52C contactor by POWER
turning on.
When serial signal from outdoor unit stops for 4 to 5 seconds.
● Check wiring (visual check and conductiv-
● Check indoor electronic control
● Check outdoor DEICER P.C. board.
● Check electrical parts.
Check point
ity check).
P.C.board.
Indoor coil
thermistor
2
Room
temperature thermistor
Defrost
3
thermistor
❈
Outdoor
power
4
system
Outdoor
❈
control
P.C. board
5
MCFH24NV only
❈
Outdoor
refrigerant
6
system
error
❈The indication is shown only when the indoor unit connects with the outdoor unit MXZ-32SV-.
2-time flash
2.5-second OFF
6-time flash
5-time flash
7-time flash
10-time flash
2.5-second OFF
2.5-second OFF
2.5-second OFF
2.5-second OFF
Outdoor unit
does not run.
Outdoor unit
does not run
Outdoor unit
does not run
Outdoor unit
does not run
Outdoor unit
does not run
Detect Indoor coil/room temperature thermistor short or
open circuit every 8 seconds
during operation.
When the defrost thermistor
shorts or opens after the compressor start-up.
When the compressor operation is continuously three times
interrupted by over current
protection within 1 minute after
start-up , it stops operation.
When it cannot properly read
data in the nonvolatile memory
of the outdoor control
P.C.board.
When the compressor operation has been interrupted by
LEV protection continuously 5
minutes, the compressor stops
operation.
E1
● Check resistance of thermistor.
● Re-connect connector.
● Check indoor electronic control P.C.board.
● Check outdoor DEICER P.C. board.
● Check resistance of thermistor.
● Re-connect connector.
● Check the inverter output.
● Check the compressor.
● Check the outdoor control P.C.board.
● Amount of gas.
● Check the outdoor control P.C. board.
● Contact of LEV board connectors.
44
Page 45
11-2-2. Trouble criterion of main parts
C
S
R
BLK
RED
WHT
BLKREDORNYLWBLU BRN
WHT
GRN
YLW
P
BLK
RED ORN
WHT
MAIN
AUX
P
BRN
YLW
PNK
RED
ORN
BLU
ROTOR
BLK YLW
RED ORN
WHT
MAIN
AUX.2
AUX.1
P
MCFH-13NV -MCFH-18NV MCFH-24NV -
E3
E3E4
MUCFH-13NV -MUCFH-18NV MUCFH-24NV -
E3
E3E4
Part name
Room
temperature
thermistor (RT11)
Indoor coil
thermistor (RT12)
Defrost
thermistor
(RT61)
Ambient temper-
ature thermistor
(RT63)
MUCFH-24NV
only
Compressor
(MC)
Indoor fan
motor
(MF)
Check method and criterion
Measure the resistance with a tester.
(Part temperature 10°C ~ 30°C)
Normal
8kΩ ~ 20kΩ
Opened or short-circuited
Abnormal
Measure the resistance with a tester.
(Part temperature - 10°C ~ 40°C)
Normal
5kΩ ~ 60kΩ
Abnormal
Opened or short-circuited
Measure the resistance between the terminals with a tester.
(Part temperature -10°C ~ 40°C)
Normal
18NV
1.05~1.30Ω
2.38~2.92Ω
24NV
0.84~1.04Ω
1.82~2.24Ω
C-R
C-S
13NV
1.86~2.28Ω
3.50~4.29Ω
Measure the resistance between the terminals with a tester.
(Part temperature10°C ~ 30°C)
WHT-BLK
13NV
Normal
18/24NV
79~87Ω175~190Ω
Abnormal
BLK-YLW63~69Ω66~72Ω
YLW-BLU34~38Ω45~50Ω
Opened or
short-circuited
BLU-BRN25~29Ω30~33Ω
BRN-RED13~15Ω22~24Ω
Figure
Abnormal
Opened or
short-circuited
13/18/24NV
Measure the resistance between the terminals with a tester.
(Part temperature -10°C ~ 40°C)
Outdoor fan
motor
(MF)
WHT-BLK
BLK-RED
BLK-YLW
YLW-RED
Measure the resistance between the terminals with a tester.
(Part temperature10°C ~ 30°C)
Vane
motor
(MV)
RED-PNK/ORN
BRN-YLW/BLU
13NV
155 ~ 190Ω
364 ~ 446Ω
Normal
18NV
102 ~ 126Ω
24NV
55 ~ 68Ω
97 ~ 120Ω
26 ~ 33Ω
55 ~ 68Ω
NormalAbnormal
329
~357
Ω
Opened or
short-circuited
45
Abnormal
Opened or
short-circuited
13/18NV
24NV
p
: Inner protector
Page 46
A
Check of indoor fan motor
Indoor fan does not operate.
No
Reconnect the lead wires.
Check of receiver P.C. board
B
Are lead wires connected?
Disconnect lead wires from connector (Fan motor).
Measure resistance between lead wires No.1 and No.4 and then No.3 and No.4 of the fan motor.
Turn OFF power supply.
Check connector (Fan motor) visually.
Yes
Is resistance 0 (short circuit) or ∞ (open circuit)?
Yes ( 0 or ∞ )
Replace the indoor fan motor.
Is soldered point normal?
Yes
Replace the indoor electronic control
P.C. board.
No
(others)
No
Resolder it.
Indoor unit operates by pressing the EMERGENCY OPERATION switch, but does not operate with the remote controller.
Switch on the remote controller
Is LCD display on remote controller visible?
Yes
Remove batteries and then set them back.
Check if the unit operates with remote
controller.
Does the unit operate with remote
controller?
Yes
OK
No
(not clear)
No
Replace the batteries.(see page 42.)
Turn on a radio to AM and press switch
on remote controller.
Is noise heard from radio?
Yes
Are there any fluorescent lights of
inverter or rapid-start type within
the range of 1m?
No
Measure the voltage between receiver P.C.board connector No.2
when remote controller button is pressed.
No
Yes
Replace the remote controller.
● Re-install the unit away from lights.
● Attach a filter on receiving part.
(+)
and No.1
Is the voltage approx. 4V DC ?
No(5V or 0V DC)
Replace the receiver.
46
Yes
Replace the indoor electronic control
P.C. board.
Page 47
Check of indoor electronic control P.C. board
C
The unit doesn’t operate with the
remote controller.
Replace the fuse.
Also, the OPERATION INDICATOR
lamp doesn’t light up by pressing
the EMERGENCY OPERATION
switch.
Yes
No
No
Check both “parts side”and “pattern
side” of indoor electronic control P.C.
board visually.
Check of outdoor unit
D
Is fuse(F11)blown?
Be sure to check both fuse
and varistor in any case.
Is varistor(NR11)burnt?
Yes
Replace the varistor.
Compressor and outdoor fan do not operate.(Only indoor fan operates.)
MCFH-13NV -MCFH-18NV -
E3E4
Start
Trouble of the indoor electronic
control P.C. board.
Yes
Check the outdoor DEICER P.C.board and outdoor 52C compressor contactor at first, then
check the outdoor fan motor and compressor.
Yes
Check the continuity of indoor and outdoor unit
connection.
Press EMERGENCY OPERATION
switch. 3-minute time delay works.
Test run operation operates for 30
minutes.
Check voltage to terminal
block of outdoor unit. Is there
220-240V AC to terminal
block between 2 - N ?
No
Check voltage to terminal
block of indoor unit. Is there
220-240V AC to terminal
block between 2 - N ?
No
Replace the indoor electronic control
P.C.board.
47
Page 48
Check of outdoor unit
D
Compressor and outdoor fan do not operate.(Only indoor fan operates.)
MCFH-24NV -
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.
E3
Start
Compressor
doesn't operate.
Is there 5V DC between
+
J101 - J401 on the deicer
P.C. board? w1
Yes
Is there 220-240V AC
between A1-A2 on the
compressor contactor(52C)?
Is there 220-240V AC
between 2/T1 on the
compressor contactor(52C)
and N on the outdoor
terminal block?
Check the compressor.
Outdoor fan motor
doesn't operate.
Yes
Yes
Is there 220-240V AC
No
between CN730 1-3 on
the deicer P.C. board? w1
Replace the
deicer P.C. board.
No
No
Replace the
deicer P.C. board.
Is there 220-240V AC
between 1/L1 on the
compressor contactor(52C)
and N on the outdoor
terminal block?
Replace the compressor
contactor(52C).
Yes
Yes
No
Make the connection
of wiring correct.
No
Make the connection
of wiring correct.
Is there 5V DC between
+
J101 - J401 on the deicer
P.C. board? w1
Yes
Is there 220-240V AC
between CN711 1-3 or
2-3 on the deicer P.C.
board? w1
Check the outdoor fan
motor. Refer to page 45.
Yes
Is there 220-240V AC
No
between CN730 1-3 on
the deicer P.C. board? w1
Replace the
deicer P.C. board.
No
Replace the
deicer P.C. board.
Yes
No
Make the connection
of wiring correct.
48
Page 49
How to check mis-wiring and serial signal error (when outdoor unit does not work)
E
Start
3 min. later, when relay 52C turns ON, what self-check result is
displayed on OPERATION INDICATOR lamp indoor unit? w1
Repair wiring.
Is there 20V DC between both ends of R132 when
relay (52C) turns ON?
(By tester, the stylus is between 0 ~ 20V.)
Yes
1. Turn OFF power supply and disconnect in-out connecting wire on indoor side.
2. Short-circuit between indoor terminal block and .
3. Turn ON power supply and press EMERGENCY OPERATION switch.
Yes
•Turn OFF power supply.
•Connect ON in-out connecting wire.
•Turn ON power supply.
1. Turn OFF power supply.
2. Turn ON power supply.
3. Press EMERGENCY OPERATION switch.
Mis-wiring is indicated.(1-sec.ON,1-sec.OFF)
Is there mis-wiring, poor contact, or wire disconnection?
No
N
3
No
w 1 Short circuit of JPG and JPS on the
electronic control P.C. board enables
self-check to be displayed in 3 seconds.
Serial signal error is indicated.
(1-sec.ON, 2.5-sec.OFF)
Replace the indoor electronic control
P.C. board.
3 minutes later, when EMERGENCY OPERATION switch is pressed
and 52C relay turns ON, is there 220-240V AC between outdoor terminal block and ?
2
N
Yes
3 minutes later, when EMERGENCY OPERATION switch is pressed
and 52C relay turns ON, is there 5V DC between J9 -J8 ?
–
+
Yes
3 minutes later, when EMERGENCY OPERATION switch is pressed
and 52C relay turns ON, is there 10V DC between both ends of
R601?
(By tester, the stylus is between 5 ~10V DC)
Yes
Replace the outdoor DEICER P.C. board.
No
No
No
Rectify in-out connecting wire.
Check and rectify fuse and varistor on outdoor DEICER P.C. board.
Rectify in-out connecting wire.
49
Page 50
Check of outdoor unit
After 30 seconds,
does compressor stop?
No
Yes
Is there 220-240V AC
between A1-A2 on the
compressor contactor?
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 220-240V AC
between 2/T1 on the
compressor contactor and N
on the outdoor terminal
block?
Yes
Replace the
compressor contactor.
No
Make the connection
of wiring correct.
F
Compressor and / or outdoor fan motor doesn’t stop.
Check of R.V. coil
G
Unit operates COOL mode even if it is set to HEAT mode.
w First, measure the resistance of R.V. coil to confirm it is disconnected or is not short-circuit.
Disconnect the TAB52 on the deicer P.C. board.
Turn ON the power supply and operate
the indoor unit in HEAT mode by pressing
the EMERGENCY OPERATION switch.
Unit operates HEAT mode even if it is set to COOL mode.
w First, measure the resistance of R.V. coil to confirm it is disconnected or is not short-circuit.
Disconnect the TAB52 on the deicer P.C. board.
Turn ON the power supply and operate
the indoor unit in COOL mode by pressing
the EMERGENCY OPERATION switch.
After 3 minutes, is there
220-240V AC between CN721
1-3 on the deicer P.C. board?
Replace the R.V. coil.
After 3 minutes, is there
220-240V AC between CN721
1-3 on the deicer P.C. board?
Replace the
deicer P.C. board.
Yes
Yes
No
Replace the
deicer P.C. board.
No
Replace the R.V. coil.
50
Page 51
H
Check of outdoor thermistor
Thermistors in the outdoor unit are abnormal.
w Disconnect the connectors CN661 and/or CN662 from the deicer P.C. board.
(Check the characteristics of each thermistor.)
Defrost thermistor(RT61)
Measure
resistance
between CN 661
1 and 2.
Reconnect CN661
and CN662.
Turn OFF the
power supply.
Ambient temperature
thermistor(RT63)
Measure
resistance
between CN 662
3 and 4.
Does the resistance
of thermistor have
the characteristics
on page 33?
No
Replace the
thermistor.
Turn ON the power
Yes
supply and press
the EMERGENCY
OPERATION
switch.
Replace the deicer P.C.
board.
No
Does the unit operate
10 minutes or more?
Yes
Ok W1.
W1. It is thought defective contact of the connector.
51
Page 52
DE00R697B
To the indoor
electronic control
P.C.board CN113
Indoor coil thermistor (RT12)
Room temperature thermistor (RT11)
RT11
EMERGENCY OPERATION switch
TH113
CH313
GILMS
12
0
0
10
20
30
40
10 20 30 40 50 60
Temperature ( C)
Resistance (K')
TEST POINT DIAGRAM AND VOLTAGE
MCFH-13NV MCFH-18NV MCFH-24NV -
E4
E3
E3
Indoor electronic control P.C. board
Fan motor power supply 220 - 240V AC (Refer to page 46.)
Very
Med.
Low
75643218
Low High
Fuse (F11) 250V AC 3.15A
Power supply
input 220-240V AC
Room temperature
thermistor(RT11)
+
12V DC
}
–
+
5V DC
}
–
JHA (Release of AUTO RESTART FUNCTION.
Refer to page 41.)
Time short point
Indoor coil thermistor (RT12)
52
Page 53
MUCFH-13NV MUCFH-18NV -
Outdoor deicer P.C. board
Outdoor fan motor
220-240V AC
}
E4
E3
R.V. coil
220-240V AC
}
R601
5~10V DC
}
+
DEICER P.C. BOARD
INPUT
220-240V AC
}
Defrost thermistor(RT61)
}
}
DC12V
Fuse (F61)
2A/250V
Defrost interval
time short pin
(Refer to page 41)
+
J9
5V DC
}
J8
+
+
}
52C
12V DC
Defrost interval
Defrost termination
temperature change
Jumper wire JPC and JPE
(Refer to page 41.)
53
Page 54
MUCFH-24NV -
Defrost thermistor (RT61)
Ambient temperature thermistor (RT63)
-20 -10 0 10 20 30 40
0
10
20
30
40
50
60
70
80
90
100
Temperature(:)
Resistance(k")
E3
Outdoor deicer P.C. board
CN661 1-2
Defrost thermistor (RT61)
Defrost
interval
time short
pin(JPG1,
R871)
+
J101
}
5V
DC
J401
(Refer to
page 48)
Jumper wire for
change in defrost
setting (JRF, JRG)
(Refer to page 41.)
CN662 3-4
Ambient temperature thermistor
(RT63)
54
Fan motor
connector
(CN711)
Varistor
(NR62)
R.V. coil
}
(CN721)
+
12V DC
}
Fuse (F61)
3.15A / 250V
Varistor
(NR61)
CN7301-3
}
220-240V AC
(Refer to
page 48.)
R601
}
10V DC
+
(Refer to
page 49.)
Page 55
12
DISASSEMBLY INSTRUCTIONS
“w” shows the terminals with a lock mechanism,
so they cannot be removed when you pull the
lead wire.
Be sure to pull the wire by pushing the locking
lever (project part) of the terminal with a finger.
1Slide the sleeve.
2Pull the wire while pushing the locking lever.
12-1. MCFH-13NV-, MCFH-18NV-, MCFH-24NV-
INDOOR UNIT
OPERATING PROCEDUREPHOTOS
1. Removing the electronic control P. C . board.
(1) Pull out the upper part of the grill. ( photo 1 )
(2) Remove the screws of the grill.
(3) Remove screws of terminal block cover.
Remove the terminal block cover and remove the terminal
block.
(4) Remove the screws of the electronic box cover.
(5) Pull out the electronic control P. C. board.
Photo 3
Photo 1
E3E3E4
Screws
Photo 2
Electronic control P.C. board
2. Removing the indoor fan motor
(1) Remove the grill. ( Refer to 1(1) (2) )
(2) Remove the screws of the pipe support assembly.
(3) Remove the fan casings.(upper) .
(4) Disconnect the connector of the indoor fan motor.
(5) Disconnect the ground wire of the fan motor.
(6) Remove the screws of the motor band and remove the
catch.
(7) Take out the sirocco fan and the indoor fan motor .
55
Electronic box
Photo 4
Fan casing
(upper)
Indoor fan motor
Terminal block
Motor band
Screws
Fan
casing(upper)
Page 56
OPERATING PROCEDUREPHOTOS
3. Removing the indoor heat exchanger.
(1) Remove the grill. (Refer to 1(1) (2))
(2) Remove the screws on both side and in front of the front
panel. (Photo 5)
(3) Remove the screws of the nozzle assembly. (Photo 6)
(4) Remove the electronic box . (Refer to 1)
(5) Remove the indoor fan motor . (Refer to 2)
(6) Remove the screws of the motor support .
(7) Remove the fan casing . (Iower)
(8) Remove the insullations of the drain pan and remove the
screws . (Photo 7)
(9) Remove the screws under the drain pan .(Photo 8)
(10) Remove the drain pan .
(11) Remove the indoor heat exchanger.
Photo 5
Screws
Photo 6
Screws
Photo 7
Photo 8
Insullations and screws
screws
56
Page 57
12-2. MUCFH-13NV -
OUTDOOR UNIT
OPERATING PROCEDUREPHOTOS
E4
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
cabinet
Photo 2
Screws of the front panel
and motor support
Screws of the cabinet
Screws of the
top panel
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.
57
Photo 4
Screw
Deicer
P.C. board
Screws
Relay panel
Terminal
block
Page 58
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
Propeller fan nut
Hook
Outdoor
fan motor
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) Release 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, purge gas from the pipes until the pressure gauge shows 0 kg/cm
● Use the burner under the condition that gas can be released
even when the inner pressure rises by heat.
2
.
Photo 6
Glass
terminal
Compressor
Discharge pipe
Compressor
set nuts
Suction pipe
Terminal cover
58
Page 59
12-3. MUCFH-18NV -
E3
OUTDOOR UNIT
OPERATING PROCEDUREPHOTOS
1. Removing the cabinet
(1) Remove the screws of the cabinet.
(2) Hold the bottom of the cabinet on the both side to remove
the cabinet.
Photo 1
Photo 2
Screws
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.
Service
panel
Photo 3
Screws
Screws
Deicer
P.C. board
59
Compressor
Red lead wire
White lead wire
Black lead wire
Terminal
block
Page 60
OPERATING PROCEDUREPHOTOS
3. Removing the outdoor fan motor
(1) Remove the cabinet. (Refer to 1)
(2) Unconnect the connector remove the clamp of fan motor
lead wire.
(3) Remove the propeller nut and remove the propeller.
(4) Remove screws fixing the fan motor.
4. Removing the compressor
(1) Remove the cabinet. (Refer to 1)
(2) Remove the soundproof felt.
(3) Remove the terminal cover on the compressor
(4) Remove the electrical assembly.
(Refer to 2)
(5) Release gas from the refrigerant circuit.
(6) Disconnect the welded part of the discharge pipe
(7) Disconnect the welded part of the suction pipe.
(8) Remove nuts fixing the compressor.
(9) Remove the compressor.
Photo 4
propeller fan
Outdoor
fan motor
Propeller
fan nut
Photo 5
Set screws for
outdoor fan motor
Discharge
pipe
Lead clamps
Set screws for
outdoor fan motor
Terminal cover
Suction
pipe
60
Compressor
Compressor nuts
Page 61
12-4. MUCFH-24NV -
OUTDOOR UNIT
OPERATING PROCEDUREPHOTOS
E3
1. Removing the electrical parts
(1)
Remove the 5 screws and the top panel. (3 screws in
front and 2 screws in rear
(2)
Remove the screw of the cover panel. To remove the
cover panel, pull it toward you and unhook the catches from the side panel.
(3)
Remove the screw of the service panel. To remove the
service panel, pull it down toward you and unhook the
catches on the both sides.
)
Photo 1
Screws
Front panel
Photo 2
Deicer P.C. board
Transformer
Top panel
Service panel
Panel cover
Fan motor
capacitor
Contactor
2. Removing the fan motor
(1)
Remove the 3 screws of the front panel. Open the
front panel to a 45-degree angle. Then lift it and
unhook the 3 catches to remove.
(2)
Remove the propeller nut and the propeller.
(3)
Remove the 3 screws and the fan motor.
Disconnect the lead connectors.
61
Photo 3
Propeller
fan
Motor support
Propeller nut
Terminal blockScrews
Separator support plate
Lead
connectors
Valve bed
Page 62
OPERATING PROCEDUREPHOTOS
3. Removing the heat exchanger and the compressor
(1)
Remove the rear panel (2 screws in front, 1 screw on
the side, 3 screws in the rear). Remove the valve bed,
and open the rear panel to the rear to remove.
NOTE :
All panels are fixed by catches, and must be removed by
shifting up and down.
(2)
Remove the 4 screws of the right side panel and
remove it.
(3)
Remove the 3 screws of the rear guard and remove it.
(4)
Remove the 4 screws of the separator support plate
and remove it.
(5)
Remove the 2 screws of the motor support and
remove it.
(6)
Remove the 5 screws of the valve bed.
The valve bed is fixed by the catches on the right and
left sides.
Lift it to remove.
(7)
Remove the electrical parts box.
Disconnect the connectors from the high pressure
switch, crank case heater, shell thermo, and fan motor
lead.
(8)
Remove the 2 screws of the separator and remove it.
(9)
Remove the 2 screws of the heat exchanger and
remove it.
Detach the welded point of pipe.
)
(
Remove the 3 nuts of the compressor and remove it.
10
Detach the welded points of the compressor suction
pipe and discharge pipe.
VANE MOTOR
INSTALLATION METAL (L)
AIR FILTER
GRILLE
FRONT PANEL ASSEMBLY
DRAIN PAN
FAN CASING (U)
FAN CASING (L)
UNION (GAS)
UNION (GAS)
INSTALLATION METAL (R)
UNION (LIQUID)
UNION (LIQUID)
BACK PANEL
NOZZLE
INDOOR HERT EXCHANGER
VANE
GRILLE CATCH
SIROCCO FAN
FAN MOTOR RUBBER MOUNT
INDOOR FAN MOTOR
INDOOR FAN MOTOR
TERMINAL BLOCK
TERMINAL BLOCK
RECEIVER P.C. BOARD
INDOOR-COIL THERMISTOR
ELECTRONIC CONTROL P.C. BOARD
ELECTRONIC CONTROL P.C. BOARD
ELECTRONIC CONTROL P.C. BOARD
ELECTRONIC CONTROL P.C. BOARD
ELECTRONIC CONTROL P.C. BOARD
ELECTRONIC CONTROL P.C. BOARD
AUTO RESTART ASSEMBLY
SWITCH BOARD
VARISTOR
VARISTOR
FUSE
OUTDOOR HEAT EXCHANGER
CABINET
GRILLE(OUT)
COMPRESSOR
COMPRESSOR RUBBER SET
BASE
STOP VALVE(GAS)
STOP VALVE(LIQUID)
REVERSING VALVE
SERVICE PANEL
BACK PANEL
MOTOR SUPPORT
TOP PANEL
CAPILLARY TUBE
CAPILLARY TUBE
CHECK VALVE
RH-231VHAT
3PCS/SET
{12.7
{6.35
{3.0✕{1.8✕200
{3.0✕{1.4✕500
MC
MUCFH13NV-
E3
1
1
1
1
3
1
1
1
1
1
1
1
1
1
2
1
1
1
1
3
1
1
1
1
1
1
1
1
1
2
1
14
15
MUCFH-
13NV-
E4
13-4. OUTDOOR UNIT STRUCTURAL PARTS
MUCFH-13NV MUCFH-13NV -
1
2
3
E3
E4
13
12
1011
Part numbers that are circled is not shown in the illustration.
4
65
675
8
9
Page 66
MUCFH-13NV -MUCFH-13NV -
No.Part No.
Part name
Remarks
Symbol
in Wiring
Diagram
Q'ty/unit
MUCFH13NV-
E3
RA6V33-
30+/440VAC
250V 2A
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
MUCFH13NV-
E4
1
2
3
4
5
6
7
8
9
PROPELLER FAN
OUTDOOR FAN MOTOR
DEFROST THERMISTOR
COMPRESSOR CAPACITOR
DEICER P.C. BOARD
SURGE ABSORBER
TERMINAL BLOCK(OUT)
R.V. COIL
FUSE
CABINET
FAN GUARD
SERVICE PANEL
OUTDOOR HEAT EXCHANGER
MOTOR SUPPORT
COMPRESSOR
BASE
OUTDOOR FAN MOTOR
PROPELLER FAN
COMPRESSOR CAPACITOR
CONTACTOR
TERMINAL BLOCK
SIDE PANEL
COMPRESSOR RUBBER SET
STOP VALVE(LIQUID)
STOP VALVE(GAS)
TOP PANEL
DEICER P.C. BOARD
DEFROST THERMISTOR
REAR PANEL
FUSE
THERMOSTAT
FAN MOTOR RELAY
SURGE ABSORBER
SURGE KILLER 1
SURGE KILLER 2
R.V.COIL
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE