LG LM-2320C2L/M User manual

Multi Type Room
Air Conditioner
SERVICE MANUAL
MODEL: LM-2320C2L/M

Functions...................................................................................................................................... 3
Product Specifications................................................................................................................ 5
Dimensions................................................................................................................................... 6
Refrigeration Cycle Diagram....................................................................................................... 8
Wiring Diagram ............................................................................................................................ 9
Operation Details ....................................................................................................................... 10
Display Function........................................................................................................................ 14
Self-diagnosis Function ............................................................................................................ 14
Installation.................................................................................................................................. 15
Operation.................................................................................................................................... 29
Disassembly of the parts (Indoor Unit).................................................................................... 31
2-way, 3-way Valve ..................................................................................................................... 33
Cycle Troubleshooting Guide ....................................................................................................37
Electronic Parts Troubleshooting Guide.................................................................................. 38
Electronic Control Device ......................................................................................................... 44
Schematic Diagram.................................................................................................................... 45
Exploded View and Replacement Parts List............................................................................ 46
- 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 Compressor operation(for Cooling model)
• Intermittent operation of fan at low speed.
• The fan is switched to low(Cooling) 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
Sleep Mode Auto Control
Natural Air Control by CHAOS Logic
Airflow Direction Control

- 4 -
Remote Controller
JET COOL
Healthy Dehumidification Operation Mode. ( )
Operation Mode Selection
(Cooling
model only)
Cooling Operation Mode.( ) Auto Operation Mode.( )
Sleep Operation
Fan Operation Mode
Room, Temperature Display
Setting the Time or Timer
Airflow Direction Control
Operation ON/OFF
Temperature Setting
TEMPERATURE LOWHIGH
Timer Selection
ON OFF
Timer Setting
SET
Timer Cancel
CANCEL
Reset
Fan Speed Selection
(Low) (Med) (High) (CHAOS)
: (High: 39°C LOW : 11°C)
Down to 18°C
Up to 30°C
Cooling
: 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.

- 5 -
Product Specifications
22,700(5,720) 14,000(3,528) 8,700(2,192)
2.9 1.7 1.2
1Ø, 220V, 60Hz
Indoor 9.0 7.0
Outdoor 41
Indoor 41 + 1 38 + 1
Outdoor 55 + 1
2,400 1,500 1,050
10.9 6.8 4.7
9.46 9.33 8.3
Indoor 13 7.5
Outdoor 61
Indoor(A/B)
888 x 287 x 170 / 802 x 262 x 165
Outdoor 870 x 655 x 320
Indoor(A/B)
9 / 7
Outdoor 56
1,230 1,120
O
L.C.D Wireless
Liquid 1/4"(6.35)
Gas 1/2"(12.7) 3/8"(9.52)
O
O
Operation A-Unit Only
A-Unit + B-Unit B-Unit Only
Unit
Item
Cooling Capacity Btu/h(kcal/h)
Moisture Removal ℓ/h
Power Source ø, V, Hz
Air Circulation m3/min
Noise Level 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)(at 7.5m)
g
Airflow Direction Control(Up & Down)
Remocon Type
Service Valve
Sleeping Operation
Drain Hose
LM-2320C2L/M

1. Indoor Unit
- 6 -
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
H mm 262 287
D mm 165 170
B-Unit (9K) A-Unit (14K)
MODEL
DIM
( 9K )
( 9K )
( 14K )
( 14K )

- 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
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-2320C2L/M
MODEL
DIM

- 8 -
Refrigeration Cycle Diagram
LM-2320C2CL/M
Pipe Size (Diameter : inch)
Max.
piping length
(m)
Max.
piping elevation
(m)
Gas Liquid
3/8"(1/2") 1/4" 10~15 5~7
ex) Capillary
Cooling
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

3854A20023C
INDOOR WIRING DIAGRAM
CN-DISP1
CN-U/D
FUSE
AC250V/T2A
CN-TH1
SSR
SH-CAPA.
BR
YL
OR
BK 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
RY-COMP.
4
3
CN-POWER CN-MOTOR
3854A20023D
INDOOR WIRING DIAGRAM
CN-DISP1
CN-U/D
FUSE
AC250V/T2A
CN-TH1
SSR
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
TO INDOOR UNIT 3854AP7050H
MAIN
POWER
B-UNITA-UNIT
OUTDOOR WIRING DIAGRAM
1(L) 1(L)2(N) 1(L) 2(N)2(N)
WH WH
BK
BK
8
7
1
36
C
NC
BK
BK
BK
BK
BK CAPACITOR
BR
O.L.P
O.L.P
T/B 4
T/B 1
T/B 3
T/B 2
BL BL
BR
BL
BL
WH
OR
OR
MOTOR
POWER
RELAY
TERMINAL
8LOCK(10P)
COMP
B
COMP
A
RR S
S
C
C
YL
YL
GN/YL
GN/YL
FH
C
CAPACITOR
RD
RD
RD
33
- 9 -
Wiring Diagram(Indoor Unit & Outdoor Unit)
1. A-Unit(14K) (Indoor Unit) 2. B-Unit(9K) (Indoor Unit)
3. Outdoor Unit

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
■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 compressor
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
•While in compressor off, the indoor fan repeats low airflow speed and pause.
•While the intake air temp is between compressor on temp. and compressor off temp., 10-min dehumidification
operation and 4-min compressor off repeat.
Compressor ON Temp. ➲Setting Temp+0.5°C
Compressor OFF Temp. ➲Setting Temp-0.5°C
•In 10-min dehumidification operation, the indoor fan operates with the low airflow speed.
■Cooling overload
•Control indoor fan by sensing outdoor pipe temperature.
•One step down from setting fan speed if pipe temperature is oven 50°C and if below 45°C, operate on setting
temperature.
-10-

■ Fuzzy Operation (Cooling only Model)
•According to the temperature set by Fuzzy rule, when the intake air temp is 0.5°C or more below the setting
temp, the compressor is turned off. When 0.5°C or more above the setting temp, the compressor is turned on.
Compressor ON Temp ➲Setting Temp + 0.5°C
Compressor OFF Temp ➲Setting Temp + 0.5°C
•At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the
intake air temp at that time.
26°C ≤Intake Air Temp ➲25°C
24°C ≤Intake Air Temp < 26°C ➲Intake Air Temp + 1°C
22°C ≤Intake Air Temp < 24°C ➲Intake Air Temp + 0.5°C
18°C ≤Intake Air Temp < 22°C ➲Intake Air Temp
Intake Air Temp<18°C➲ 18°C
•When the Fuzzy key (Temperature Control key) is input after the initial setting temperature is selected, the
Fuzzy key value and the intake air temperature at that time are compared to select the setting temperature
automatically according to the Fuzzy rule.
•While in Fuzzy operation, the airflow speed of the indoor fan is automatically selected according to the
temperature.
■ Airflow Speed Selection
•The airflow speed of the indoor fan is set to high, medium, low, or chaos (auto) by the input of the airflow
speed selection key on the remote control.
■On-Timer Operation
•When the set time is reached after the time is input by the remote control, the appliance starts to operate.
•The timer LED is on when the on-timer is input. It is off when the time set by the timer is reached.
•If the appliance is operating at the time set by the timer, the operation continues.
■ Off-Timer Operation
•When the set time is reached after the time is input by the remote control, the appliance stops operating.
•The timer LED is on when the off-timer is input. It is off when the time set by the timer is reached.
•If the appliance is on pause at the time set by the timer, the pause continues.
■ Off-Timer <=> On-Timer Operation
•When the set time is reached after the on/off time is input by the remote control, the on/off-timer operation is
carried out according to the set time.
■ Sleep Timer Operation
•When the sleep time is reached after <1,2,3,4,5,6,7,0(cancel) hr> is input by the remote control while in appli-
ance operation, the operation of the appliance stops.
•While the appliance is on pause, the sleep timer mode cannot be input.
•While in cooling mode operation, 30 min later since the start of the sleep timer, the setting temperature
increases by 1°C. After another 30 min elapse, it increases by 1°C again.
•When the sleep timer mode is input while in cooling cycle mode, the airflow speed of the indoor fan is set to
the low.
•When the sleep timer mode is input while in heating cycle mode, the airflow speed of the indoor fan is set to
the medium.
-11-

-12-
■ Chaos Swing Mode
•By the Chaos Swing key input, the upper/lower vane automatically operates with the Chaos Swing or they are
fixed to the desired direction.
•While in Chaos Swing mode, the angles of cooling and heating cycle operations are different.
■ Chaos Natural Wind Mode
•When the Chaos Natural Wind mode is selected and then operated, the high, medium, or low speed of the air-
flow mode is operated for 2~15 sec. randomly by the Chaos Simulation.
■ Jet Cool Mode Operation (Cooling only Model)
•If the Jet Cool key is input at any operation mode while in appliance operation, the Jet Cool mode operates.
•In the Jet Cool mode, the indoor fan is operated at super-high speed for 30 min at cooling mode operation.
•In the Jet Cool mode operation, the room temperature is controlled to the setting temperature, 18°C
•When the sleep timer mode is input while in the Jet Cool mode operation, the Jet Cool mode has the priority.
•When the Jet Cool key is input, the upper/lower vanes are reset to those of the initial cooling mode and then
operated in order that the air outflow could reach further.
■ Auto Restarting Operation
•When the power is restored after a sudden power failure while in appliance operation, the mode before the
power failure is kept on the memory and the appliance automatically operates in the mode on the memory.
•The slide switch on the main unit of the appliance should be on the Auto Restarting position in order that the
Auto Restarting operation is available.
•Operation Mode that is kept on the memory
- State of Operation ON/OFF
- Operation Mode/Setting Temp/Selected Airflow Speed
- Sleep Timer Mode/Remaining Time of Sleep Timer (unit of hour)
•If no input by the remote control or no switching of the slide switch within 7 hr after the appliance operates by
the Auto Restarting operation, the appliance is forced to stop at the moment of 7-hr elapse.
■Forced Operation (Cooling only Model)
•To operate the appliance by force in case that the remote control is lost, the forced operation selection switch
is on the main unit of the appliance to operate the appliance in the standard conditions.
•When the power is supplied while the slide switch is on the forced operation position, or when the slide switch
position is switched to the Auto Restarting position (or test operation) or switched from the remote control posi-
tion to the forced operation position while the power is on, the forced operation is carried out.
•When the slide switch position is switched from the forced operation position to the Auto Restarting position or
the remote control position, the forced operation is canceled and the appliance stops operating.
•The forced operation is carried out in cooling mode with the setting temperature 22°C and the high speed of
airflow.
•While in forced operation, the key input by the remote control has no effect and the buzzer sounds 10 times to
indicate the forced operation.
FORCED
OPERATION
AUTO
RESTART
REMOTE
CONTROL

-13-
■Remote Control Operation Mode
•When the remote control is selected by the slide switch on the main unit, the appliance operates according to
the input by the remote control.
■Protection of the evaporator pipe from frosting
•If the indoor pipe temp is below 0°C in 7 min. after the compressor operates without any pause while in cool-
ing cycle operation mode, the compressor and the outdoor fan are turned off in order to protect the indoor
evaporator pipe from frosting.
•When the indoor pipe temp is 7°C or higher after 3 min. pause of the compressor, the compressor and the
outdoor fan is turned on according to the condition of the room temperature.
■Buzzer Sounding Operation
•When the appliance-operation key is input by the remote control, the short "beep-beep-" sounds.
•When the appliance-pause key is input by the remote control, the long "beep—" sounds.
•When a key is input by the remote control while the slide switch on the main unit of the appliance is on the
forced operation position, the error sound "beep-beep-beep-beep-beep-" is made 10 times to indicate that the
remote control signal cannot be received.

Display Function
■Cooling Model
•Cooling, Soft Dry, Fan
•Sleep Mode
•Timer Mode
Self-diagnosis Function
■Error Indicator
•The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble.
•Error mark is ON/OFF for the operation LED of evaporator body in the same manner as the following table.
•If more than two troubles occur simultaneously, primarily the highest trouble fo error code is expressed.
•After error occurrence, if error is released, error LED is also released simultaneously.
•To operate again on the occurrence of error code 12, be sure to pull out power cord and then re-insert.
•Having or not of error code is different from Model.
Operation Indicator
Timer Indicator
Sleep Timer Indicator
Compressor on Indicator
-14-
OUT
DOOR
1(once)
(once)
(twice)
(twice)
(5times)
(once)
(twice)
(3times)
3sec 3sec
3sec
3sec 3sec
3sec
3sec 3sec 3sec
3sec
3sec
2
3
5
12
Error
Code Error LED
(Indoor body operation LED) Error contents SVC check point
•Indoor suction temperature
thermistor open/short.
•Indoor pipe temperature
thermistor open/short. •Indoor TH ass'y check
•Outdoor TH ass'y
check
•Resetting of remocon
operating mode
•Communication
line/circuit check
•Primarily check
refrigerant pressure
•Connecting pipe check
•Connecting cable check
•Outdoor suction temperature
thermistor open/short.
•Outdoor pipe temperature
thermistor open/short.
•Abnormal operation of multi
product.
(Simultanueous operation of
cooling and heating)
•Misconnection of connecting
cables
•Poor communication

- 15 -
Installation
Front
Right Rear right
Rear left
Down right
Left
More than 5 cm
More than eye-level
More than
5 cm
More than
5 cm
More than 10 cm More than 10 cm
More than 70 cm
A
B
Indoor unit
Outdoor unit
1) Selection of the best location
1. Indoor unit
•There should not be any heat source or steam
near the unit.
•There should not be any obstacles to prevent
the air circulation.
•A place where air circulation in the room will be
good.
•A place where drainage can be easily obtained.
•A place where noise prevention is taken into
consideration.
•Do not install the unit near the door way.
•Ensure the spaces indicated by arrows from
the wall, ceiling, fence, or other obstacles.
2. Outdoor unit
•If an awning is built over the unit to prevent
direct sunlight or rain exposure, be careful that
heat radiation from the condenser is not
restricted.
•There should not be any animals or plants
which could be affected by hot air discharged.
•Ensure the spaces indicated by arrows from
the wall, ceiling, fence, or other obstacles.
3. Piping length and the elevation
Pipe Size
GAS LIQUID
Max. piping
length
A (m)
Max.
Elevation
B (m)
1/2"(3/8") 1/4" 10~15 5~7
(1) Installation of Indoor, Outdoor unit

- 16 -
2) Indoor Unit Installation
The mounting wall should be strong and solid
enough to protect it from the vibration.
1. Mount the installation plate on the wall with
four Type "A" screws.
(If mounting the unit on the concrete wall, consid-
er using anchor bolts.)
•Always mount the Installation plate horizontally
by aligning the marking-off line by means of the
thread and a level.
2. Drill the piping hole with 70mm dia. holecore
drill.
•Line according to the arrows marked on lower
the left and the rght side of the Installation Plate.
The meeting point of the extended line is the
center of the hole.
•Drill the piping hole at either the right or the left
and the hole should be slightly slant to the out-
door side.
Installation Plate
marking-off line
Thread
Weight
Type "A" screw
ø70mm ø70mm
5~7mm
A
A
A
A
ø70mm ø70mm
50mm
20mm
20mm
80mm
Indoor Outdoor
Wall
Left rear piping Right rear piping
Left rear piping Right rear piping
The lower left and the right side of
Installation Plate
9K Btu
14K Btu

- 17 -
1) Preparation of pipings
1. Cut the pipes and the cable.
•Use the accessory piping kit or the pipes pur-
chased locally.
•Measure the distance between the indoor and
the outdoor unit.
•Cut the pipes a little longer than the measured
distance.
•Cut the cable 1.5m longer than the length of the
pipe.
2. Remove burrs.
•Remove burrs from cut edges of pipes.
•Turn the pipe end toward down to avoid the
metal powder entering the pipe.
Caution:
If burrs are not removed, they may cause a gas
leakage.
3. Flaring the pipes.
•Insert the flare nuts, mounted on the connection
ports of both indoor and outdoor unit, onto the
copper pipes. Some refrgerant gas may leak,
when the flare nuts are removed from the indoor
unit, as some gas is charged to prevent the
inside of the pipe from rusting.
•Fit the copper pipe end into the Bar of flare tool
about 0~0.5mm higher. (See illustration)
•Flare the pipe ends.
4. Tape the flaring portion to protect it from the
dust or damages.
90 Slanted
Pipe cutter
Rough
Reamer
Pipe
Point down
"A"
Bar
Copper pipe Clamp handle Red arrow mark
Cone
Bar Yoke
Handle
Inclined Cracked Uneven
thickness
Surface
damaged
= Improper flaring =
When properly flared, the internal surface flare will
evenly shine and be of even thickness.
Since the flare part comes into contact with the connec-
tors, carefully check the flare finish.
"
A"; ø12.7 mm (1/2")
→ 0~0.5 mm
ø9.52 mm (3/8")
→ 0~0.5 mm
ø6.35 mm (1/4")
→ 0~0.5 mm
(2) Piping and Drainage of Indoor Unit

- 18 -
2) Connection of Pipings
1. Remove the installation plate
•Pull the two '∆' marked portion of bottom of the
chassis and pull the installation plate out of chas-
sis.
2. Route the drain hose and the indoor tubing.
For left rear piping
3. Route the tubing and the drain hose straight
backwards(see figure).
4. Insert the connecting cable into the indoor unit
through the piping hole.
•Do not connect the cable to the indoor unit.
•Make a small loop with the cable for easy con-
nection later.
5. Tape the tubing, drain hose and the connecting
cable. Be sure that drain hose locates at the low-
est side of the bundle.
Locating at the upper side can be a reason that
drain water overflows drain pan inside the unit.
Installation plate
Pull
Pull
•To remove the holder, press
the bottom of the chassis
near the holder upwards
and the tab is clear of its
hole.
•Turn it clockwise approx.
90°and remove it.
Tubing holder
Gas side piping
Liquid side piping
Drain hose
Connecting
cable
󱃦Press
󱃧Pull

- 19 -
Connecting
cable
Drain hose
Indoor unit tubing Flare nut Pipings
Spanner Torque wrench
Plastic bands Insulation material
Press the lower left and right side of the unit
against the Installation Plate until the hooks
engage with their slots (sound click).
6. Indoor unit installation.
•Hook the indoor unit onto the upper position of
the installation plate. (Engage the two hooks of
the rear top of the indoor unit with the upper
edge of the installation plate.)
Ensure the hooks are properly seated on the
installation plate by moving it in left and right.
7. Connecting the pipings to the indoor unit.
•Align the center of the pipings and sufficiently
tighten the flare nut with fingers.
•Finally, tighten the flare nut with torque wrench
until the wrench clicks.
Wrench tightening the flare nut with forque
wrench, ensure the direction for tightening fol-
lows the arrows on the wrench.
8. Wrap the insulation material around the con-
necting portion.
CAUTION: Take care to arrange the pipings,
drain hose and cables as the right
upper picture for inserting it into the
indoor unit and refixing the tubing
holder easily.
Pipe Size Torque
Liquid Side (1/4") 1.8kg·m
Gas Side (3/8") 4.2kg·m
Gas Side (1/2") 5.5kg·m
Wrap the insulation material around the connecting
portion.

- 20 -
9. Set the pipings and the connecting cable to
the back of the chassis with the tubing
holder.
•Hook the edge of tubing holder to tap on chas-
sis and push the bottom of tubing holder to be
engaged in the bottom of chassis.
10. Indoor unit installation
•Hook the indoor unit onto the upper portion of
installation plate. (Engage the two hooks of the
rear top of the indoor unit with the upper edge
of the installation plate.)
Ensure the hooks are properly seated on the
installation plate by moving it in left and right.
Drain hose
Tubing holder
Taping
Piping
Push
2
Hook
1
Connecting
cable
Drain hose
Press the lower left and right side of the unit
against the Installation Plate until the hooks
engages with their slots (sound click).