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
• HEAT PUMP
–12–
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
• Rated performance for refrigerant line length of: 5m
• If 24K or 28K Model is installed at a distance of 15m, 500g of refrigerant
• If 24K or 28K Model is installed at a distance of 15m, 500g of refrigerant
should be added ....................................................(15-5)x50g
MODEL
24K, 28K, 30K BTU 5/8"
3/8"
5
20
36K BTU
3/4"
3/8"
5
25
GAS
LIQUID
5
15
50
5
20
70
Elevation B(m)
Length A(m)
* Additional
refrigerant
(g/m)
Pipe Size
Rated
Rated
Max.
Max.
Wiring Diagram
(1) Indoor Unit
1. COOLING ONLY
2. HEAT PUMP
–13–
–14–
(2) Outdoor Unit
1. LT-B2461CL/B2861CL/B2421CL
B2821CL/B3021CL
2. LT-B2461HL/B2421HL
3. LT-B2861HL
4. LT-B2821HL/B3021HL
COMP.
MOTOR
R
S
C
RD
BL
BL
P.T.C
(OPTION)
BR
BR
BR
BL
BL
BL
FUSE(5A)
FUSE(5A)
BL
YL
RD
POWER
RELAY
8
4
1
6
2
0
CAPACITOR
GN/YL
TO INDOOR
POWER INPUT
1(N) 2(L)
3(N) 4(L)
5
6
7
8
TERMINAL
BLOCK
GN/YL
OR
BR
BK
BR
COMP.
MOTOR
R
S
C
BL
BR
BR
BR
BR
BL
BL
BK
BK
WH
BL
CRANK CASE
HEATER
FUSE(5A)
FUSE(5A)
BL
RD
YL
BK
OR
OR
BK
BK
RD
REVERSING
COIL
BK
BK
YL
BL
POWER
RELAY
8
4
1
6
2
0
Capacitor
HIGH PRESSURE S/W
GN/YL
L1
L2
L3
GN/YL
TO INDOOR
POWER INPUT
1(N) 2(L)
3(N) 4(L)
5
6
7
8
TERMINAL
BLOCK
3854A90002G
GN/YL
BK
COMP.
MOTOR
R
S
C
BL
BR
BR
BR
BR
BL
BL
WH
BL
FUSE(5A)
FUSE(5A)
BL
RD
P.T.C
(OPTION)
BR
YL
OR
BK
BK
BK
BK
RD
REVERSING
COIL
BK
BK
YL
BL
POWER
RELAY
8
4
1
6
2
0
Capacitor
Capacitor
HIGH PRESSURE S/W
GN/YL
L1
L2
L3
GN/YL
TO INDOOR
POWER INPUT
1(N) 2(L)
3(N) 4(L)
5
6
7
8
TERMINAL
BLOCK
3854A90002N
GN/YL
BK
COMP.
MOTOR
R
S
C
BL
BR
BR
BR
BR
BL
BL
WH
BL
FUSE(5A)
FUSE(5A)
BL
RD
YL
OR
BK
BK
BK
BK
RD
REVERSING
COIL
BK
BK
YL
OR
BL
POWER
RELAY
8
4
1
6
2
0
Capacitor
Capacitor
HIGH PRESSURE S/W
GN/YL
L1
L2
L3
GN/YL
TO INDOOR
POWER INPUT
1(N) 2(L)
3(N) 4(L)
5
6
7
8
TERMINAL
BLOCK
GN/YL
BK
–15–
5. LT-B3681CL
THMO
C
H
L
T
O
INDOOR
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
TMo
Co
HIGH PRESSURE SWITCH FOR HEATING
TERMINAL BLOCK
RUN CAPACITOR FOR FMo
TM
CM
MAIN TERMINAL BLOCK
COMPRESSOR
F1
FMo
FUSE (250V, 5A)
OUTDOOR FAN MOTOR
P/NO : 3854A30042P
RD : RED
WH : WHITE
YL :
WH : WHITE
YL :
YELLOW
WIRING OF FIELD
(CONNECTING WIRE)
(CONNECTING WIRE)
TM
3Ø, 380-415V
POWER SUPPLY
BK
52C
1
3
5
31
2
4
6
32
B
A
BK
WH
BK
WH
RD
BK
BK
RD
BL
BK
WH
T1
T3
T2
CM
WH
WH
BL
BK
R S T N
Co
OR YL BL BK
OR YL BL BK
Co
FMo
1
FMo
2
GN/YL
3(N)
4(L)
5
6
6
7
F1
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