LG LM-2421C2L/A2L User manual

Multi Type Room Air Conditioner
SERVICE MANUAL
MODEL: LM-2421C2L/A2L
LM-3022C3L/A3L

Functions...................................................................................................................................... 3
Product Specifications................................................................................................................ 4
Dimensions....................................................................................................................................6
Refrigeration Cycle Diagram....................................................................................................... 9
Wiring Diagram........................................................................................................................... 11
Operation Details ........................................................................................................................12
Display Function/Self-diagnosis Function .............................................................................. 14
Installation.................................................................................................................................. 15
Operation.................................................................................................................................... 31
Disassembly of the parts (Indoor Unit).................................................................................... 32
2-way, 3-way Valve..................................................................................................................... 34
Cycle Troubleshooting Guide....................................................................................................38
Electronic Parts Troubleshooting Guide ................................................................................. 40
Electronic Control Device ......................................................................................................... 46
Schematic Diagram.................................................................................................................... 47
Exploded View and Replacement Parts List............................................................................ 50
-2-
Contents

-3-
Functions
OUT
DOOR
Indoor Unit Remote Controller
Operation ON/OFF by Remote controller
Sensing the RoomTemperature
• 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, Low
--- Lights up in operation
--- Lights up in Soft Dry Mode
--- Lights up in Timer Mode
--- Lights up in compressor operation
Room temperature control
Starting Current Control
Time Delay Safety Control
Indoor Fan Speed Control
• Intermittent operation of fan at low speed
Soft Dry Operation Mode
• Used to set the time of stopping operation.
OffTimer Control
Operation ON/OFF
Operation Mode Selection
Fan Speed Selection
Temperature Setting
Airflow Direction Control
• The louver can be set at the desired position
or swing up and down automatically.
Cooling Operation Mode ( )
Soft Dry Operation Mode ( )
(LOW)
Cooling Down to 18°C
Up to 30°C,
(HIGH)
Airflow Direction Control
Operation indication Lamps (LED)
TEMPERATURE LOWHIGH
TIME
OFF
hr.
TEMP.
TIME
OFF
hr.
TEMP.

-4-
Product Specifications(Cooling Only)
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
888x287x170
870x655x320
9
61
1,650(7.5m Base)
O
L.C.D Wireless
1/4"(6.35)
1/2"(12.7)
O
Operation A or B unit A+Bunit
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
1. LM-2421C2L/A2L

-5-
14,000(4,000)
14,000(4,000) 22,000(6,000) 22,000(5,800) 20,000(7,300)
1.4 1.6 3 3.2 4.6
1Ø, 220V, 60Hz
Indoor 9.5 9.5 8.8 + 7.8 7.8 + 7.8
8.8+7.8+7.8
Outdoor 53 - - - -
Indoor 38 40 - - -
Outdoor 60
2,250 2,250 2,500 2,500 2,600
10.5 10.5 11.5 11.5 12
6.22 6.22 8.8 8.8 10.77
Indoor 13.6/15
Outdoor 90
Indoor 888 x 287 x 170
Outdoor 870 x 655 x 320
Indoor 10 - - -
Outdoor 63
1,800
O
L.C.D Wireless
Liquid 1/4"(6.35) - - -
Gas 1/2"(12.7) - - -
O
Operation A-Unit
BorC-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
2. LM-3022C3L/A3L

-6-
Dimensions
Installation plate
A
A
ø70mm
Center
Center
ø70mm
Left rear piping Right rear piping
A
A
D
H
W
Tubing hole cover
Wmm 888
Hmm 287
Dmm 170
LM-2421C2L/A2L
LM-3022C3L/A3L
MODEL
DIM
1. Indoor Unit

-7-
W
D
L1
L2
L9
L4 L3
H
L10L10L10
L8
Gas side
3-Way valve
Liquid side
2-Way valve
L7L5L6
2. Outdoor Unit
2-1. LM-2421C2L/A2L
W mm 870
H mm 655
D mm 320
L1 mm 370
L2 mm 25
L3 mm 630
L4 mm 25
L5 mm 546
L6 mm 160
L7 mm 160
L8 mm 64
L9 mm 76.5
L10 mm 50
LM-2421C2L
LM-2421A2L
MODEL
DIM

-8-
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 655
D mm 320
L1 mm 370
L2 mm 25
L3 mm 630
L4 mm 25
L5 mm 546
L6 mm 160
L7 mm 160
L8 mm 64
L9 mm 76.5
L10 mm 50
LM-3022C3L
LM-3022A3L
MODEL
DIM
2-2. LM-3022C3L/A3L

-9-
Refrigeration Cycle Diagram
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
1. LM-2421C2L/A2L

-10-
2. LM-3022C3L/A3L
COMP
3-WAY
Valve
2-WAY
Valve
ACCUMUIATOR
ø6.35
ø12.7
ø12.7
ø12.7
ø6.35
ø6.35
HEAT
EXCHANGER
HEAT
EXCHANGER
(A Unit) (B Unit) (C 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