LG LT-B3680HL Service Manual ▷ View online
• HEAT PUMP
(
Rated performance for refrigerant line length of: 5m)
For installation over rated distance, 70g of refrigerant should be added for each meter.
ex) When installed at a distance of 15m, 700g of refrigerant should be added.
(15-5) x 70g = 700g
–8–
INDOOR UNIT
OUTDOOR UNIT
HEAT
EXCHANGER
EXCHANGER
HEAT
EXCHANGER
EXCHANGER
COMPRESSOR
GAS SIDE
LIQUID SIDE
COOLING
HEATING
REVERSING
VALVE
VALVE
CHECK VALVE
CAPILLARY TUBE
CAPILLARY TUBE
Pipe size(Diameter: ø)
Piping length(m)
Elevation(m)
MODEL
Gas
Liquid
Rated
Max.
Rated
Max.
HEAT PUMP
3/4"
3/8"
5
25
5
20
Wiring Diagram
(1) LT-B3680CL
1.
Indoor Unit
2.
Outdoor Unit
–9–
INDOOR WIRING DIAGRAM
3854A90002F
OUTDOOR UNIT WIRING DIAGRAM
–10–
(2) LT-B3680HL
1.
Indoor Unit
2.
Outdoor Unit
INDOOR WIRING DIAGRAM
3854A90002F
OUTDOOR UNIT WIRING DIAGRAM
–11–
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 when an air-filter is polluted. Then clean the air-filter for refer-
ence 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.
COMP. ON
(SET TEMP.+0.5°C)
(SET TEMP.+0.5°C)
COMP. OFF
(SET TEMP. -0.5°C)
(SET TEMP. -0.5°C)
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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