LG LT-B2421CL / LT-B2421HL / LT-B2461CL / LT-B2461HL / LT-B2821CL / LT-B2821HL / LT-B2861CL / LT-B2861HL / LT-B3021CL / LT-B3021HL / LT-B3621CL / LT-B3621HL / LT-B3661CL / LT-B3661HL / LT-B3681CL / LT-B3681HL Service Manual ▷ View online
–16–
6. LT-B3681HL
Outdoor Unit Wiring Diagram
NOTE
BL : BLUE
BK : BLACK
BR : BROWN
OR : ORANGE GN/YL : GREEN/YELLOW
BK : BLACK
BR : BROWN
OR : ORANGE GN/YL : GREEN/YELLOW
63H2
C TH
20SV
52C
TMo
HIGH PRESSURE SWITCH FOR HEATING
THERMISTOR FOR PIPE TEMP.
REVERSING COIL
MAGNECTIC CONTACTOR
TERMINAL BLOCK
TM
52F1
CM
Co
FMo
MAIN TERMINAL BLOCK
RELAY FOR FMo
COMPRESSOR
RUN CAPACITOR FOR FMo
OUTDOOR FAN MOTOR
F1
DP
CH1
THMO
52F2
FUSE (250V, 5A)
DEICER PCB
CRANK CASE HEATER FOR CM
THEMOSTAT FOR COOLING
RELAY FOR FMO CONTROL.
P/NO : 3854A30042H
RD : RED
WH : WHITE
YL :
WH : WHITE
YL :
YELLOW
WIRING OF FIELD
(CONNECTING WIRE)
(CONNECTING WIRE)
TM
3Ø, 380-415V
POWER SUPPLY
BK
63H2
52C
1
3
5
31
2
4
6
32
B
A
BK
WH
BK
TNS
NO
C TH
NC
D.P
WH
T/B1
BK
WH
WH
WH
RD
BK
WH
BK
BK
RD
BL BK
BK
WH
T1
T3
T2
CH1
CM
YL
WH
WH
BL
BK
R S T N
Co
OR YL BL BK
OR YL BL BK
Co
FMo
1
FMo
2
20SV BK
BK
BK
BK
BK
WH
YL
WH
YL
BL
BL
THMO
C
L
H
GN/YL
T
OO INDOOR
3(N)
4(L)
5
6
6
7
7
8
52F2
1
2
3
4
5
6
7
8
52F1
1
2
3
4
5
6
F1
–17–
7. LT-B3621CL/B3661CL
Outdoor Unit Wiring Diagram
NOTE
BL : BLUE
BK : BLACK
BR : BROWN
OR : ORANGE GN/YL : GREEN/YELLOW
BK : BLACK
BR : BROWN
OR : ORANGE GN/YL : GREEN/YELLOW
52C
TMo
Co
MAGNETIC CONTACTOR
TERMINAL BLOCK
RUN CAPACITOR FOR FMo
TM
CM
CR
MAIN TERMINAL BLOCK
COMPRESSOR
RUN CAPACITOR FOR CM
F1
FMo
FUSE (250V, 5A)
OUTDOOR FAN MOTOR
P/NO : 3854A30042N
RD : RED
WH : WHITE
YL :
WH : WHITE
YL :
YELLOW
WIRING OF FIELD
(CONNECTING WIRE)
(CONNECTING WIRE)
TM
POWER SUPPLY
BK
Cr
52C
BK
BK
L1
T1
L2
T2
B
A
WH
BK
WH
BK
WH
BL
BK
BK
RD
R
C
S
CM
WH
WH
GN/YL
WH
BL
BK
1
(
N
)
2
(
L
)
Co
OR YL BL BK
OR YL BL BK
Co
FMo
1
FMo
2
THMO
C
H
L
GN/YL
T
O
INDOOR
3(N)
4(L)
5
6
6
7
F1
–18–
8. LT-B3621HL/B3661HL
Outdoor Unit Wiring Diagram
NOTE
BL : BLUE
BK : BLACK
BR : BROWN
OR : ORANGE GN/YL : GREEN/YELLOW
BK : BLACK
BR : BROWN
OR : ORANGE GN/YL : GREEN/YELLOW
63H2
C TH
20SV
52C
Cr
HIGH PRESSURE SWITCH FOR HEATING
THERMISTOR FOR PIPE TEMP.
REVERSING COIL
MAGNECTIC CONTACTOR
RUN CAPACITOR FOR CM
TM
52F1
CM
Co
FMo
MAIN TERMINAL BLOCK
RELAY FOR FMo
COMPRESSOR
RUN CAPACITOR FOR FMo
OUTDOOR FAN MOTOR
F1
DP
CH1
THMO
52F2
FUSE (250V, 5A)
DEICER PCB
CRANK CASE HEATER FOR CM
THEMOSTAT FOR COOLING
RELAY FOR FMO CONTROL.
P/NO : 3854A30042L
RD : RED
WH : WHITE
YL :
WH : WHITE
YL :
YELLOW
WIRING OF FIELD
(CONNECTING WIRE)
(CONNECTING WIRE)
TM
POWER SUPPLY
BK
63H2
Cr
52C
CH1
BK
BK
BK
BK
L1
T1
L2
T2
B
A
WH
BK
TNS
NO
C TH
NC
D.P
WH
T/B1
BK
WH
WH
BK
WH
BL BK
BK
RD
R
C
S
CM
YL
WH
WH
GN/YL
WH
BL
BK
1
(
N
)
2
(
L
)
Co
OR YL BL BK
OR YL BL BK
Co
FMo
1
FMo
2
20SV BK
BK
BK
BK
BK
WH
YL
WH
YL
BL
BL
THMO
C
L
H
GN/YL
T
O
INDOOR
3(N)
4(L)
5
6
6
7
7
8
52F2
1
2
3
4
5
6
7
8
52F1
1
2
3
4
5
6
F1
–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)
• 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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