LG LT-D3680CL / LT-D3680HL / LT-D3682HL / LT-D4820CL / LT-D4820HL / LT-D4822HL / LT-D4880CL / LT-D4880HL Service Manual ▷ View online
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Operation Details
(1) The function of main control
1. Time Delay Safety Control
• 3min
The compressor is ceased for 3minutes to balance the pressure in the refrigeration cycle.
(Protection of compressor)
• 5sec
Vertical air flow direction control louvers open in 5 seconds to prevent noise between louvers and wind.
• 30sec
The 4-way valve is ceased for 30sec. to prevent the refrigerant-gas abnormal noise when the Heating
operation is OFF or switched to the other operation mode while compress is off.
While compressor is running, it takes 3~5 seconds to switch.
2. Auto Swing Control
• This function is to swing the louver up and down automatically.
3. Air-Filter Checking Control
• 'Filter' will display in the remote controller display and main body display when an air-filter is polluted. Then clean
the air-filter for reference to Owners Manual.
4. Soft-Dry Operation
• The indoor fan speed is automatically set to the low, so the shift of the indoor fan speed is impossible because of
already being set to the best speed for Dry Operation by Micom Control.
5. Cooling Mode Operation
• When selecting the Cooling( ) Mode Operation, the unit will operate according to the setting by the remote con-
troller and the operation diagram is as following
Intake Air temp.
SET TEMP.+0.5°C
(COMP. ON)
SET TEMP. -0.5°C
(COMP. OFF)
More than
More than
3 minutes
3 minutes
Selecting
Selecting
Selecting
fan speed
fan speed
fan speed
COMPRESSOR
ON
OFF
ON OFF
ON
INDOOR FAN
Low Low
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Intake Air temp.
Setting temp.+3°C
(Compressor OFF)
Setting temp.
(Compressor ON)
(Compressor ON)
INDOOR FAN
Low
OFF Low
Low
OFF
COMPRESSOR
ON
OFF
ON
OFF
A point; While the indoor Heat-Exchanger temperature is higher than 40°C fan operates at low speed, when
it becomes lower than 40˚C fan stops.
B point; When the indoor Heat-Exchanger temperature is higher than 36°C, fan operates at seleted fan
speed, when it becomes lower than 33°C, the fan operates at low speed.
6. Heating Mode Operation (Except Cooling Model)
The unit will operate according to the setting by the remote controller and the operation diagram is shown as following.
(Hot Start)
Low
OFF
Selecting
Fan Speed
minimum 3min
Selecting fan
speed
minimum
10sec.
1min
A
A
minimum
1min.
minimum
10sec.
B
7. Hot-Start Control
The indoor fan stops until the evaporator piping temperature will be reached to 28°C.
The operation diagram is as following.
PIPING
TEMPERATURE
TEMPERATURE
1min
COMPRESSOR
INDOOR FAN
ON
OFF
LOW
Selecting
fan speed
22
°
C
25
°
C
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8. Defrost Control
• Defrost operation is controlled by timer and sensing the indoor piping temperature.
• The defrost starts only when the outdoor pipe temperature falls below -6°C after 45 minutes passed from starting
• The defrost starts only when the outdoor pipe temperature falls below -6°C after 45 minutes passed from starting
of heating operation.
• Defrost ends after 9 minutes 30 seconds passed from starting of defrost operation or when the outdoor pipe
temperature rises over 12°C even if before 12 minutes.
More than 45 minutes
of heating operation
Within
9min. 45sec.
ON
OFF
ON
ON
ON
ON
OFF
OFF
COMPRESSOR
4-WAY VALVE
INDOOR FAN
-6
°
C ON
12
°
C OFF
The outdoor
piping Temp.
ON
More than 10 min.
running of compressor
More than 45 minutes
of heating operation
5sec.
HOT-
START
ON
9. Self-Diagnosis Function
• 'CHECK' will flash in the remote controller display when a problem occurs. Then please contact your dealer.
• Correct the accident point as shown in the table below before restarting operation.
• During the normal operation 'CHECK' won't be displayed in the remote controller.
• Correct the accident point as shown in the table below before restarting operation.
• During the normal operation 'CHECK' won't be displayed in the remote controller.
Remote controller LCD
Accident Point
CH 01
Indoor room temperature thermistor error
CH 02
Indoor piping thermistor error
CH 03
Indoor main body / Remote controller unit communication error
CH 04
Water level float switch error
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8. Defrost Control
• Defrost operation is controlled by timer and sensing the indoor piping temperature.
• The defrost starts only when the outdoor pipe temperature falls below -6°C after 45 minutes passed from starting
• The defrost starts only when the outdoor pipe temperature falls below -6°C after 45 minutes passed from starting
of heating operation.
• Defrost ends after 9 minutes 30 seconds passed from starting of defrost operation or when the outdoor pipe
temperature rises over 12°C even if before 12 minutes.
More than 45 minutes
of heating operation
Within
9min. 45sec.
ON
OFF
ON
ON
ON
ON
OFF
OFF
COMPRESSOR
4-WAY VALVE
INDOOR FAN
-6
°
C ON
12
°
C OFF
The outdoor
piping Temp.
ON
More than 10 min.
running of compressor
More than 45 minutes
of heating operation
5sec.
HOT-
START
ON
9. Self-Diagnosis Function
• 'CHECK' will flash in the remote controller display when a problem occurs. Then please contact your dealer.
• Correct the accident point as shown in the table below before restarting operation.
• During the normal operation 'CHECK' won't be displayed in the remote controller.
• Correct the accident point as shown in the table below before restarting operation.
• During the normal operation 'CHECK' won't be displayed in the remote controller.
Remote controller LCD
Accident Point
CH 01
Indoor room temperature thermistor error
CH 02
Indoor piping thermistor error
CH 03
Indoor main body / Remote controller unit communication error
CH 04
Water level float switch error
