LG LM-2422C2L User manual

Multi Type Room
Air Conditioner
SERVICE MANUAL
MODEL: LM-2422C2L
LM-2422A2L/A3L
LM-3620C2L/C2M/A2L
LM-3622A2L
LM-3625C3L/A3L
LM-3626A3L
LM-4822C3L
LM-4822A3L

Functions...................................................................................................................................... 3
Product Specifications................................................................................................................ 5
Dimensions................................................................................................................................... 9
Refrigeration Cycle Diagram..................................................................................................... 13
Wiring Diagram .......................................................................................................................... 17
Operation Details ....................................................................................................................... 20
Display Function........................................................................................................................ 27
Self-diagnosis Function ............................................................................................................ 27
Installation.................................................................................................................................. 28
Operation.................................................................................................................................... 42
Disassembly of the parts (Indoor Unit).................................................................................... 44
2-way, 3-way Valve ..................................................................................................................... 46
Cycle Troubleshooting Guide ....................................................................................................50
Electronic Parts Troubleshooting Guide.................................................................................. 51
Electronic Control Device ......................................................................................................... 58
Schematic Diagram.................................................................................................................... 61
Exploded View and Replacement Parts List............................................................................ 66
- 2 -
Contents

- 3 -
Functions
• Room temperature sensor. (THERMISTOR)
• Maintains the room temperature in accordance with the Setting Temp.
• Indoor fan is delayed for 5 seconds at the starting.
• Restarting is inhibited for approx. 3 minutes.
• High, Med, Low, Chaos
--- Lights up in operation
--- Lights up in Sleep Mode
--- Lights up in Timer Mode
--- Lights up in Deice Mode(for Heat pump model)
--- Lights up in Compressor operation(for Cooling model)
• Intermittent operation of fan at low speed.
• The fan is switched to low(Cooling), med(Heating) speed.
• The unit will be stopped after 1, 2, 3, 4, 5, 6, 7 hours.
• The fan is switched to intermittent or irregular operation
• The fan speed is automatically switched from high to low speed.
• The louver can be set at the desired position or swing
up and down automatically.
Indoor Unit
Operation ON/OFF by Remote controller
Sensing the Room Temperature
Room temperature control
Starting Current Control
Time Delay Safety Control
Indoor Fan Speed Control
Operation indication Lamps (LED)
OUT
DOOR
Health Dehumidification Operation
• Both the indoor and outdoor fan
stops during deicing.
• Hot start after deice ends.
• The indoor fan stops until the
evaporator piping temperature will be
reached at 22°C.
Sleep Mode Auto Control
Natural Air Control by CHAOS Logic
Airflow Direction Control
Deice (defrost) control (Heating)
Hot-start Control (Heating)

- 4 -
Healthy Dehumidification Operation Mode. ( )
Remote Controller
Operation ON/OFF
Reset
Operation Mode Selection
Temperature Setting
Timer Selection
Timer Setting
JET COOL
Timer Cancel
Sleep Operation
Airflow Direction Control
(Cooling
model only) (Heating
model only)
TEMPERATURE LOW HIGH
Cooling Operation Mode.( ) Heating Operation Mode.( ) Auto Operation Mode.( )
Fan Operation Mode
Horizontal Airflow Direction Control Button(Option)
Room, Temperature Display
Setting the Time or Timer
PLASMA(Option)/NEGATIVE ION(Option)
ON OFF
SET
PLASMA
CANCEL
Fan Speed Selection
(Low) (Med) (High) (CHAOS)
: (High:39°C Low:11°C)
: OFF, ON, OFF ON
: Cancel Sleep Mode, Timer ON or Timer OFF
: 1, 2, 3, 4, 5, 6, 7, Off Timer
: Fan Operates without cooling or heating.
Cooling Down to 18°C
Up to 30°CHeating Down to 16°C Up to 30°C

- 5 -
Product Specifications
17,000(4,270) 24,000(6,050)
1.6 1.6 x 2
1Ø, 220, 60HZ
9.0
49
38+1
56+1
2,260 2,410
10.5 11.5
7.5 9.96
14.4
90
888 x 287 x 170
870 x 655 x 320
9
61
1,650(at 7.5m)
O
L.C.D Wireless
1/4"(6.35)
1/2"(12.7)
O
O
0.75mm2
2.5mm2
Operation A or B unit A + B unit
Unit
Indoor
Outdoor
Indoor
Outdoor
Indoor
Outdoor
Indoor
Outdoor
Indoor
Outdoor
Liquid
Gas
Item
Cooling Capacity Btu/h(kcal/h)
Moisture Removal /h
Power Source ø, V, Hz
Air Circulation m3/min
Noise Level(Low) dB(A)
Input W
Runnig Current A
E.E.R. Btu/h.w
Motor Output W
Dimensions(W x H x D) mm
Net. Weight kg
Refrigerant(R-22) g
Airflow Direction Control(Up & Down)
Remocon Type
Service Valve
Drain Hose
Plasma Filter
Connecting Cable
Power Cord
1. LM-2422C2L, LM-2422A2L

- 6 -
17,800(4,486) 35,600(8,972)
2.0 2.0 x 2
1Ø, 220, 60HZ
13.1
58
40
57
1,900 3,650
8.7 16.8
9.4 9.8
21
90
1,080 x314 x 181
870 x 800 x 320
11
71
A: 820, B: 820 (at 7.5m)
O
L.C.D Wireless
1/4"(6.35)
5/8"(15.88)
O
LM-3622A2L only
1.5mm2
3.5mm2
Operation A or B unit A + B unit
Unit
Indoor
Outdoor
Indoor
Outdoor
Indoor
Outdoor
Indoor
Outdoor
Indoor
Outdoor
Liquid
Gas
Item
Cooling Capacity Btu/h(kcal/h)
Moisture Removal /h
Power Source ø, V, Hz
Air Circulation m3/min
Noise Level(Low) dB(A)
Input W
Runnig Current A
E.E.R. Btu/h.w
Motor Output W
Dimensions(W x H x D) mm
Net. Weight kg
Refrigerant(R-22) g
Airflow Direction Control(Up & Down)
Remocon Type
Service Valve
Drain Hose
Plasma Filter
Connecting Cable
Power Cord
2. LM-3620C2L, LM-3620A2L, LM-3622A2L

- 7 -
12,000(3,024) 13,000(3,276) 25,000(6,300) 23,800(5,998) 35,800(9,022)
1.4 1.5 2.9 2.5 3.9
1Ø, 220V, 60Hz
Indoor 9.0 9.5 9.0 + 9.5 9 + 9 9.0 x 3
Outdoor 58 - - - -
Indoor 37 38 - - -
Outdoor 57
1,300 2,100 3,200 2,400 3,600
5.7 9.3 13.6 10.1 14.8
9.2 6.2 7.8 9.9 9.9
Indoor 14.4 x 3
Outdoor 90
Indoor 888 x 287 x 170
Outdoor 870 x 800 x 320
Indoor 9 - - -
Outdoor 71
A: 550, B: 1,100 (at 7.5m)
O
L.C.D Wireless
Liquid 1/4"(6.35)
Gas 1/2"(12.7)
O
LM-3626A3L only
0.75mm2
3.5mm2
Operation A-Unit
B or C-Unit A+B or C B+C A+B+C
Unit
Item
Cooling Capacity Btu/h(kcal/h)
Moisture Removal /h
Power Source ø, V, Hz
Air Circulation m3/min
Noise Level(Low) dB(A)
Input W
Runnig Current A
E.E.R. Btu/h.w
Motor Output W
Dimensions(W x H x D) mm
Net. Weight kg
Refrigerant(R-22) g
Airflow Direction Control(Up & Down)
Remocon Type
Service Valve
Drain Hose
Plasma Filter
Connecting Cable
Power Cord
3. LM-3625C3L/A3L, LM-3626A3L

- 8 -
24,000(6,048) 16,000(4,032) 40,000(10,080) 24,000(6,048)
48,000(12,096)
2.5 2.2 4.8 3.4 6.5
1Ø, 220V, 60Hz
Indoor 14.5 9.0 14.5 + 9.0 8.2 + 8.2
14.5 + 8.2 + 8.2
Outdoor 106
Indoor 47/44/40 42/40/38 - - -
Outdoor 60
2,500 2,300 4,500 2,500 4,700
11.0 10.5 20.0 11.0 21.0
9.6 7.0 8.9 9.6 10.6
Indoor 22 14.4
Outdoor 80 x 2
Indoor
1,180 x 314 x 181 888 x 287 x 170
Outdoor 1,225 x 900 370
Indoor 11 9 - - -
Outdoor 106
1,570 1,300 - - -
O
L.C.D Wireless
Liquid 3/8"(9.52) 1/4"(6.35) ---
Gas 5/8"(15.88) 1/2"(12.7) ---
O
LM-4822C3L/A3L only
0.75mm2
5.5mm2
Operation A-Unit
B or C-Unit A+B or C B+C A+B+C
Unit
Item
Cooling Capacity Btu/h(kcal/h)
Moisture Removal /h
Power Source ø, V, Hz
Air Circulation m3/min
Noise Level(Low) dB(A)
Input W
Runnig Current A
E.E.R. Btu/h.w
Motor Output W
Dimensions(W x H x D) mm
Net. Weight kg
Refrigerant(R-22) g
Airflow Direction Control(Up & Down)
Remocon Type
Service Valve
Drain Hose
Plasma Filter
Connecting Cable
Power Cord
4. LM-4822C3L, LM-4822A3L

1. Indoor Unit
- 9 -
Dimensions
Installation plate
Installation plate
Right rear piping
Left rear piping
ø70mm ø70mm
50mm
20mm
20mm
80mm
A
A
ø70mm
Center
Center
ø70mm
Left rear piping Right rear piping
A
A
D
H
W
Tubing hole cover
W mm 802 888 1,080
H mm 262 287 314
D mm 165 170 181
4.5K, 6K, 7K, 8K, 9K
Btu Series 9K, 10K, 12K Btu
Series 18K, 24K Btu
MODEL
DIM
( 4.5K, 6K, 7K, 8K, 9K )
( 4.5K, 6K, 7K, 8K, 9K )
( 9K, 10K, 12K, 18K, 24K )
( 9K, 10K, 12K, 18K, 24K )

- 10 -
2. Outdoor Unit
2-1. LM-2422C2L, LM-2422A2L, LM-3622A2L, LM-3620C2L, LM-3620A2L
W
D
L1
L2
L9
L4 L3
H
L10L10L10
L8
Gas side
3-Way valve
Liquid side
2-Way valve
L7L5L6
W mm 870 870
H mm 655 800
D mm 320 320
L1 mm 370 370
L2 mm 25 25
L3 mm 630 775
L4 mm 25 25
L5 mm 546 546
L6 mm 160 160
L7 mm 160 160
L8 mm 64 64
L9 mm 76.5 76.5
L10 mm 50 50
LM-2422C2L, LM-2422A2L LM-3620C2L, LM-3622A2L, LM-3620A2L
MODEL
DIM

- 11 -
2-2. LM-3625C3L/A3L, LM-3626A3L
W
L5L6 L7 L8
L3
H
D
L1
L2
L4
L10L9
Gas side
3-way valve
Liquid side
2-way valve
L10L10L10L10
W mm 870
H mm 800
D mm 320
L1 mm 370
L2 mm 25
L3 mm 775
L4 mm 25
L5 mm 546
L6 mm 160
L7 mm 160
L8 mm 64
L9 mm 76.5
L10 mm 50
LM-3625C3L/A3L, LM-3626A3L
MODEL
DIM

- 12 -
900
1,225
370
2-3. LM-4822C3L, LM-4822A3L

- 13 -
Refrigeration Cycle Diagram
1. LM-2422C2L, LM-2422A2L
COMP 3-WAY
Valve
ø6.35
ø12.7
ø12.7
ø6.35
HEAT
EXCHANGER
HEAT
EXCHANGER
(A Unit) (B Unit)
Pipe Size (Diameter : inch) Max.
piping length
(m)
Max.
piping elevation
(m)
Gas Liquid
1/2" 1/4" 10~15 5~7
ex)
Solenoid Valve
Capillary
Cooling

- 14 -
2. LM-3620C2L, LM-3622A2L, LM-3620A2L
Pipe Size (Diameter : inch)
Max.
piping length
(m)
Max.
piping elevation
(m)
Gas Liquid
5/8" 1/4" 20 10
ex) Solenoid Valve
Capillary
Cooling & Deice
A-UNIT B-UNIT
CAPILLARY TUBE
LIQUID SIDE
2-WAY VALVE
GAS SIDE
3-WAY VALVE
HEAT
EXCHANGER
(EVAPORATOR)
HEAT
EXCHANGER
(CONDENSER)
COMPRESSOR
B
COMPRESSOR
A

- 15 -
3. LM-3625C3L/A3L, LM-3626A3L
Pipe Size (Diameter : inch)
Max.
piping length
(m)
Max.
piping elevation
(m)
Gas Liquid
(1/2") 1/4" 10~15 5~7
ex) Solenoid Valve
Capillary
Cooling & Deice
Heating
Indoor Unit Outdoor Unit
Heat
Exchanger
A-Unit
Heat
Exchanger
Comp-A
Comp-B
B-Unit C-Unit
Heat
Exchanger
2- WAY
Valve
3- WAY
Valve
2- WAY
Valve
3- WAY
Valve

- 16 -
4. LM-4822C3L, LM-4822A3L
Pipe Size
(Diameter : inch)
Indoor
B/C
Max.
piping length
(m)
Max.
piping elevation
(m)
Gas Liquid
3/8"(1/2") 1/4" 15 7
A5/8" 3/8" 30 15
ex) Solenoid Valve
Capillary
Cooling
Indoor Unit Outdoor Unit
Heat
Exchanger
A-Unit
Heat
Exchanger
Comp-A
Comp-B
B-Unit C-Unit
Heat
Exchanger
2- WAY
Valve
3- WAY
Valve
2- WAY
Valve
3- WAY
Valve

- 17 -
Wiring Diagram(Indoor Unit)
1. LM-2422C2L, LM-2422A2L, LM-3625C3L/A3L, LM-3626A3L,
LM-4822C3L, LM-4822A3L
2. LM-3620C2L, LM-3622A2L, LM-3620A2L
3854A20080W
INDOOR WIRING DIAGRAM
CN-DISP1
CN-U/D
FUSE
AC250V/T2A
CN-TH1
TRIAC
SH-CAPA.
BR
YL
OR
BK
CN-TAB1
ZNR
CN-MOTOR
THERMISTOR
FORCED
OPERATION
AUTO
RESTART
REMOTE
CONTROL
STEP
MOTOR
MOTOR
MAIN PCB
ASM
DISPLAY PCB ASM
TO OUTDOOR UNIT
PILLAR
TERMINAL
BR
BL YL
GN/YL
1(L)2(N)
3
RY-COMP.
4
3
H.V.B A/CL
RD
BK BK
BK BK
BK BK
LIMIT
S/W
OPTION
3854A20023X
INDOOR WIRING DIAGRAM
CN-DISP1
CN-U/D
FUSE
AC250V/T2A
CN-TH
SSR
SH-CAPA.
BR
YL
OR
BK
CN-POWER CN-FAN
ZNR
THERMISTOR
FORCED
OPERATION
AUTO
RESTART
REMOTE
CONTROL
STEP
MOTOR
MOTOR
MAIN PCB
ASM
DISPLAY PCB ASM
TO OUTDOOR UNIT
PILLAR
TERMINAL
BR
BL YL
GN/YL
1(L)2(N)
3
OPTION
ON/OFF S/W(OPTION)
RD
BK BK
LIMIT
S/W
H.V.B A/CL
OPTION
BK BK
BK BK

- 18 -
Wiring Diagram(Outdoor Unit)
3. LM-2422C2L, LM-2422A2L
4. LM-3620C2L, LM-3622A2L, LM-3620A2L
RD
R
C
BR
BK
A-UNIT
TO INDOOR UNIT
OUTDOOR WIRING DIAGRAM 3854A20023Y
B-UNIT MAIN POWER
BL
OR
OR
RD
RD
BK
BK
WH
MOTOR
T/B
C
R
FCH
S
BL
WH
YL
BR COMP
"B"
CAPACITOR
12
34
56
78
WH
WH
BK
WH
WH
WH
TERMINAL
BLOCK
POWER
RELAY
GN/YL
GN/YL
S
COMP
"A"
YL
CAPACITOR
1(L)1(L)1(L) 2(N)2(N)2(N)
33
CN-TH CCS
R
F
TERMINAL
BLOCK(
10P )
1(L)2(N) 2(N)1(L)31
(L)2(N)
3
A-UNIT
T/BLOCK
BL BL BK
BK
TRANS FORMER
OR
THERMISTOR
YL
OR BK BR
WH
CAPA.
BK
MOTOR
COMP
BK
WH
BLYL
BK
B-UNIT
TO INDOOR UNIT
OUTDOOR WIRING DIAGRAM 3854A30076L
MAIN
POWER
A
CH
R
S
B
A5
7
CN-COM
CN-TRANSCN-COMP
CN-POWER
RY-COMP
CN-S.V
S/V B S/V
CN-FAN
RY-S.V1 RY-S.V2
432 11321
5
RY-HI
FUSE(250V/3.15A)
MAIN P.C.B ASM
BK BK
WH WH WH
BL
BR
GN/YL
GN/YL

- 19 -
5. LM-3625C3L/A3L, LM-3626A3L
6. LM-4822C3L, LM-4822A3L
OUTDOOR WIRING
DIAGRAM
MAIN PCB
ASSY
B - THERMISTOR
C - UNITB - UNIT
TO INDOOR UNIT
POWER INPUT 1Ø, 220V, 60Hz
3(N) 4(L)
1(L) 1(L)2(N) 2(N)33 3
A - UNIT
A - THERMISTOR
BK
BK
BK
BK
BK
BK
LOW
HI
BK
BK
BK
BK
YL
OR
OR
OR
BK
BK
A - MOTOR B - MOTOR A - COMP
RY - COMP(B)
RY - COMP(A)
FUSE 250V / 3.15A
3854A30042Z
B - COMP
YL
OR
OR OR
BK
BK BK
BK
RD
S
CR
S
CR
S
CR S
CR
BR YL WH BL
BK
BR
BR
BR
BR
BR
WH
WH
WH
WH
WH
TB1 TB3
TB4
TB2
WH
WH
WH
WH
BL
BL
BL BL
BLBL
BL
BL
BL
YL
RD
YL
RD
RD WH
B S / V C S / V
YL 86
142
86
142
RD
GN / YL
GN / YL
GN / YL
CN - FAN
CN - COM
RY - HI
CN - POWER
CN - COMP
CN - TH1
75 3 BA
CN - TRANS
CN - SV
RD
C S / VB S / V
RY - SV1
RY - SV2
B
A
12
34
56
78
12
34
56
78
0
0
A
B
B
A
AB
AB
BK
T/B1BK
CAPA.
CAPA.
OLP
RY1
RY2
RY3 RY8
RY7
RY9
CN-TH2
CN-SV
CN-TH1
FCH
1
BK
BK
BK T/B2
WHBR
BR
BL RD WH
GN/YL
TERMINAL
BLOCK
WH
BK
WH
BK
BK
BK
RD
BK
BK
BR
YL
YL
OR
RD
S
S
RR
CC
BK
BL RD
CN-FAN
CN-BYPASS
CN-COMP
BK
"A"
COMP "B" COMP
MOTOR
FUSE T3.15A
CN-POWERCN-COM
MAIN PCB ASSY
CN-TRANS
TRANS-
FORMER
A-UNIT B-UNIT
TO INDOOR UNIT
C-UNIT MAIN
POWER
OUTDOOR WIRING DIAGRAM 3854A20023Z
T/B3
BYPASS
B ROOM
C ROOM
S.V S.V S.V
1(L) 1(L) 1(L)
2(N) 2(N) 2(N)
33 3

- 20 -
Operation Details
1. MAIN UNIT FUNCTION
• DISPLAY
1) C/O Model
Operation Indicator
•On while in appliance operation, off while in appliance pause
•Flashing while in disconnection or short in Thermistor (3 sec off / 0.5 sec on)
Sleep Timer Indicator
•On while in sleep timer mode, off when sleep timer cancel or appliance operation pause
Timer Indicator
•On while in timer mode (on/off), off when timer mode is completed or canceled.
Comp. Running Incidator
•While in appliance operation, on while in outdoor unit compressor running, off while in compressor off
2) H/P Model
Operation Indicator
•On while in appliance operation, off while in appliance pause
•Flashing while in disconnection or short in Thermistor (3 sec off / 0.5 sec on)
Sleep Timer Indicator
•On while in sleep timer mode, off when sleep timer cancel or appliance operation pause
Timer Indicator
•On while in timer mode (on/off), off when timer mode is completed or canceled
Defrost Indicator
•Off except when hot start during heating mode operation or while in defrost control
■Cooling Mode Operation
•When the intake air temperature reaches 0.5°C below the setting temp, the compressor and the outdoor fan
stop.
•When it reaches 0.5°C above the setting temp, they start to operate again.
Compressor ON Temp ➲ Setting Temp+0.5°C
Compressor OFF Temp ➲Setting Temp-0.5°C
•While in compressor running, operating with the airflow speed set by the remote control. While in compres-
sor not running, operating with the low airflow speed regardless of the setting.
■Healthy Dehumidification Mode
•When the dehumidification operation input by the remote control is received, the intake air temperature is
detected and the setting temp is automatically set according to the intake air temperature.
26°C ≤Intake Air Temp ➲ 25°C
24°C ≤Intake Intake Air Temp<26°C➲ Intake Air Temp-1°C
18°C ≤Intake Intake Air Temp<24°C➲ Intake Air Temp-0.5°C
Intake Air Temp<18°C➲ 18°C