LG LT-D3680CL / LT-D3680HL / LT-D3682HL / LT-D4820CL / LT-D4820HL / LT-D4822HL / LT-D4880CL / LT-D4880HL Service Manual ▷ View online
–13–
(2) Capacity: 36K(3ø) - LT-D3680HL, LT-D3680CL, LT-D3682HL
<HEAT PUMP>
<COOLING ONLY>
OUTDOOR WIRING DIAGRAM
INDOOR WIRING DIAGRAM
INDOOR
MOTOR
DRAIN
PUMP
STEP
MOTOR
TEMP
.
THERMIST
OR
PIPE
THERMISTOR
REMOTE
CONTROL
FLOAT S/W
CN - DISP
DISPLAY PCB
ONLY LT-D xxx2HL
AIR
CLEANER
H.V
. ASSY
DOOR S/W
TERMINAL
BLOCK
T
O
OUTDOOR UNIT
3854A20072G
3854A90021F
BR
YL
BK
OR
BL
BL
BR
GN/YL
RD
BK
BL
GN
/YL
COMP
RD
BK
WH
RD
BK
BK
1 2
3 4 5
FUSE T3.15A
4
W
A
Y
7
8
1
TM
380-415V
3Ø, 50Hz
POWER SUPPLY
BK
63H2
52C
1
3
5
31
2
4
6
32
B
A
BK
WH
BK
52F1
1
2
3
4
5
6
TNS
NO
C TH
NC
D.P
WH
BK
WH
BK
WH
BL
RD
GN/YL
BL
BK
WH
T/B1
F1
BK
WH
WH
WH
RD
BK
WH
BK
BK
RD
WH
T1
T3
T2
CH1
Co
OR
YL
Co
OR
FMo
1
FMo
2
CM
YL
YL
BK
BK
BR
BK
BL
BK
WH
GN/YL
TMo
T
o
the indoor unit
WH
2 3 4
R S T N
20SV
BK
BK
BK
BK
1
2
3
4
5
5
6
OUTDOOR WIRING DIAGRAM
INDOOR WIRING DIAGRAM
INDOOR
MOTOR
DRAIN
PUMP
STEP
MOTOR
TEMP
.
THERMIST
O
R
PIPE
THERMISTOR
REMOTE
CONTROL
FLOAT S/W
CN - DISP
DISPLAY PCB
ONLY LT-D xxx2CL
AIR
CLEANER
H.V
. ASSY
DOOR S/W
TERMINAL
BLOCK
T
O
OUTDOOR UNIT
3854A20072P
3854A90010Y
BR
YL
BK
OR
BL
BL
BR
GN/YL
RD
BL
GN
/YL
COMP
BK
RD
WH
RD
BK
BK
1 2
3 4 5
FUSE T3.15A
1
TM
380-415V
3ø,50Hz
POWER SUPPLY
BK
52C
1
3
5
31
2
4
6
32
B
A
BK
WH
WH
BK
WH
BL
GN/YL
T/B
F1
BK
WH
RD
WH
BK
RD
WH
T1
T3
T2
Co
OR
YL
Co
OR
FMo
1
FMo
2
CM
YL
BK
BK
BR
BL
BK
BK
BK
WH
GN/YL
TMo
T
o
the indoor unit
WH
WH
2 3 4
R S T N
1
2
3
4
5
5
6
(3) Capacity: 48K(1ø) - LT-D4820HL, LT-D4820CL
<HEAT PUMP>
<COOLING ONLY>
–14–
OUTDOOR WIRING DIAGRAM
INDOOR WIRING DIAGRAM
3854A20072G
3854A20072X
INDOOR WIRING DIAGRAM
INDOOR
MOTOR
DRAIN
PUMP
STEP
MOTOR
TEMP
.
THERMIST
OR
PIPE
THERMISTOR
REMOTE
CONTROL
FLOAT S/W
CN - DISP
DISPLAY PCB
ONLY LT-D xxx2HL
AIR
CLEANER
H.V
. ASSY
DOOR S/W
TERMINAL
BLOCK
T
O
OUTDOOR UNIT
BR
YL
BK
OR
BL
BL
BR
GN/YL
RD
BK
BL
GN
/YL
COMP
RD
BK
WH
RD
BK
BK
1 2
3 4 5
FUSE T3.15A
4
W
A
Y
CM
1
2
3
4
5
6
2
3
4
5
6
1Ø,220V,60Hz
POWER SUPPLY
L
N
1
2
3
2
5
2
31
32
B
A
WH
BR
BR
RD
YL YL
YL
FMo
1
49FMo
FMo
2
49FMo
Co
TM
52C
63H2
Co
BK YL
BK
OR
OR
RD
BK
BK
RD
Cr
T2
T3
T1
WH
WH
WH
BK
BK
WH
WH
WH
BL
YL
BK
WH
BL
RD
GN/YL
To the indoor unit
52F1
BL
WH
PTCR
GN/YL
GN/YL
Tmo
1
2
3
4
5
6
7
8
F1
T/B1
T/B2
RD
RD
20SV
BK
BK
BK
BR
BK
BR
OR
BK
D.P
TNS
NO
NC
C TH
WH
WH
OUTDOOR WIRING DIAGRAM
INDOOR WIRING DIAGRAM
INDOOR
MOTOR
DRAIN
PUMP
STEP
MOTOR
TEMP
.
THERMIST
OR
PIPE
THERMISTOR
REMOTE
CONTROL
FLOAT S/W
CN - DISP
DISPLAY PCB
ONLY LT-D xxx2CL
AIR
CLEANER
H.V
. ASSY
DOOR S/W
TERMINAL
BLOCK
T
O
OUTDOOR UNIT
3854A20072P
3854A20072Y
BR
YL
BK
OR
BL
BL
BR
GN/YL
RD
BL
GN
/YL
COMP
BK
RD
WH
RD
BK
BK
1 2
3 4 5
FUSE T3.15A
CM
1
2
3
4
5
6
2
3
4
5
6
1Ø,220V,60Hz
POWER SUPPLY
L
N
1
2
3
4
5
6
31
32
B
A
WH
BR
BR
OR
BK
YL
FMo
1
49FMo
FMo
2
49FMo
Co
TM
52C
Co
BK YL
BK
OR
OR
BK
BK
RD
Cr
T2
T3
T1
WH
WH
WH
BK
BK
BK
BK
WH
BL
GN/YL
To the indoor unit
BL
WH
PTCR
GN/YL
GN/YL
Tmo
F1
BK
BK
BK
BR
WH
–15–
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
–16–
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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