LG LB-D1861HL_HP / LB-D1861CL_CP / LB-D2461HL_HP / LB-D2461CL_CP Service Manual ▷ View online
Refrigeration Cycle Diagram
• HEAT PUMP (LB-D1861HL/HP, LB-D2461HL/HP, LB-F3061HL/HP, LB-F3661HL/HP,
LB-F3681HL/HP, LB-F4261HL/HP, LB-E4881HL/HP, LB-E6081HL/HP)
• Rated performance for refrigerant line length of: 7.5m
• If 18K Model is installed at a distance of 15m, 188g of refrigerant should be added (15-7.5)x25g=188g
• If 18K Model is installed at a distance of 15m, 188g of refrigerant should be added (15-7.5)x25g=188g
–11–
INDOOR UNIT
OUTDOOR UNIT
HEAT
EXCHANGER
EXCHANGER
HEAT
EXCHANGER
EXCHANGER
COMPRESSOR
GAS SIDE
LIQUID SIDE
COOLING
HEATING
REVERSING
VALVE
VALVE
CAPILLARY TUBE
LB-D1861HL/HP
5/8"
1/4"
7.5
50
5
30
25
LB-D2461HL/HP
5/8"
1/4"
7.5
50
5
30
30
LB-F3061HL/HP
5/8"
3/8"
7.5
50
5
30
50
LB-F3661HL/HP
5/8"
3/8"
7.5
50
5
30
40
LB-F3681HL/HP
5/8"
3/8"
7.5
50
5
30
40
LB-F4261HL/HP
3/4"
3/8"
7.5
50
5
30
50
LB-E4881HL/HP
3/4"
3/8"
7.5
50
5
30
50
LB-E6081HL/HP
3/4"
1/2"
7.5
50
5
30
60
*Additional
refrigerant
(g/m)
Pipe size(Diameter: ø)
Piping length(m)
Elevation(m)
MODEL
Gas
Liquid
Rated
Max.
Rated
Max.
–12–
• COOLING ONLY (LB-D1861CL/CP, LB-D2461CL/CP, LB-F3661CL/CP,
LB-F3681CL/CP, LB-E4881CL/CP, LB-E6081CL/CP)
• Rated performance for refrigerant line length of: .7.5m
• If 18K Model is installed at a distance of 15m, 188g of refrigerant should be added (15-7.5)x25g=188g
• If 18K Model is installed at a distance of 15m, 188g of refrigerant should be added (15-7.5)x25g=188g
INDOOR UNIT
OUTDOOR UNIT
HEAT
EXCHANGER
(CONDENSER)
EXCHANGER
(CONDENSER)
HEAT
EXCHANGER
(CONDENSER)
EXCHANGER
(CONDENSER)
COMPRESSOR
GAS SIDE
LIQUID SIDE
CAPILLARY TUBE
LB-D1861CL/CP
5/8"
1/4"
7.5
50
5
30
25
LB-D2461CL/CP
5/8"
1/4"
7.5
50
5
30
25
LB-F3661CL/CP
5/8"
3/8"
7.5
50
5
30
40
LB-F3681CL/CP
5/8"
3/8"
7.5
50
5
30
40
LB-E4881CL/CP
3/4"
3/8"
7.5
50
5
30
50
LB-E6081CL/CP
3/4"
1/2"
7.5
50
5
30
60
*Additional
refrigerant
(g/m)
Pipe size(Diameter: ø)
Piping length(m)
Elevation(m)
MODEL
Gas
Liquid
Rated
Max.
Rated
Max.
–19–
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)
• 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. 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.
3. 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
–20–
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 42°C, fan operates at seleted fan
speed, when it becomes lower than 39°C, the fan operates at low speed.
4. 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
Selecting
Fan Speed
minimum 3min
Selecting fan
speed
minimum
10sec.
1min
A
A
minimum
10sec.
B
5. Hot-Start Control
• The indoor fan stops until the evaporator piping temperature will be reached to 31°C.
• The operation diagram is as following.
PIPING
TEMPERATURE
TEMPERATURE
1min
COMPRESSOR
INDOOR FAN
ON
28
°
C
: Selected Fan
: Low Fan
: Fan Stop
31
°
C
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