LG LS300CE User manual

SERVICE MANUAL
Room Air Conditioner
CAUTION
-BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
-ONLY FOR AUTHORIZED SERVICE PERSONNEL.
MODEL : LS300CE
WEBSITE http://biz.LGservice.com

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Contents
Details of LG Model Name (2004) ..........................................................................................3
Functions.................................................................................................................................4
Product Specifications ..........................................................................................................6
Dimensions..............................................................................................................................7
Refrigeration Cycle Diagram..................................................................................................9
Pipe Length and the Elevation.............................................................................................10
Wiring Diagram......................................................................................................................11
Operation Details ..................................................................................................................13
Display Function ...................................................................................................................20
Self-diagnosis Function........................................................................................................20
Installation .............................................................................................................................21
Operation ...............................................................................................................................37
Disassembly of the parts (Indoor Unit)...............................................................................39
3-way Valve............................................................................................................................43
Cycle Troubleshooting Guide...............................................................................................48
Electronic Parts Troubleshooting Guide.............................................................................49
Electronic Control Device.....................................................................................................55
Schematic Diagram...............................................................................................................58
Exploded View and Replacement Parts List.......................................................................60

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Details of LG Model Name(2004)
12 -345678910
Code Type Code of Model Meaning
1 Producing Center, A~Z L: Chang-won R22 N: India
Refrigerant A: Chang-won R410A Z: Brazil
C: Chang-won R407C D: Indonesia
T: China M: Mexico
K: Turkey R22 V: Vietnam
E: Turkey R410A S: Out Sourcing
H: Thailand
2 Product Type A~Z S: Split Type Air Conditioner
3 Cooling/Heating/Inverter A~Z C: Cooling only
H: Heat pump
X: C/O + E/Heater
Z: H/P + E/Heater
V: AC Inverter C/O
N: AC Inverter H/P
Q: DC Inverter C/O
W: DC Inverter H/P
4, 5 Capacity 0~9 Cooling/Heating Capacity
Ex. "09" →9,000 Btu/h
6 Electric Range 1~9 1: 115V/60Hz, A: 220V, 50Hz, 3Phase
A~Z 2: 220V/60Hz B: 208~230V, 60Hz, 3Phase
3: 208-230V/60Hz C: 575V, 50Hz, 3Phase
5: 200-220V/50Hz D: 440~460, 60Hz, 3Phase
6: 220-240V/50Hz E: 265V, 60Hz
7: 110V, 50/60Hz F: 200V, 50/60Hz
8: 380-415V/50Hz
9: 380-415V/60Hz
7 Chassis A~Z Name of Chassis of Unit
Ex. LSP →SP Chassis
8 Look A~Z Look,
Color (Artcool Model)
9 Function A~Z
10 Serial No. 1~9 LG Model De
* ARTCOOL COLOR
velopment Serial No.
Basic A
Basic+4Way B
Plasma Filter C
Plasma Filter+4 Way D
Tele+LCD E
Tele+LCD+Nano plasma+4Way F
Nano Plasma F+(A/changeove)+A/clean+Low A G
Nano Plasma F+(A/changeove)+A/clean+4way+Low A H
Tele+LED+4way I
Internet J
Plasma F+4Way+Oxy generator K
Nano Plasma F+(A/changeove)+A/clean L
Nano Plasma F+(A/changeove)+A/clean+4way M
Nano Plasma F+(A/changeove)+A/clean+PTC N
Nano Plasma F+(A/changeove)+Autoclean+4way+PTC P
Nano Plasma F+(A/changeove)+A/clean+4way+Low A+PTC Q
Negative ION+A/Clean R
(Nano)Plasma+Negative ION+A/Clean S
4way+(Nano)Plasma F+Negative ION+Healthy dehumidification+A/Clean T
Nano Plasma F+4Way+(A/changeove)+A/clean+ U
R Mirror
W White
B Blue
D Wood
M Metal
C Cherry

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Functions
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)
Healthy Dehumidification Mode
Sleep Mode Auto Control
Auto Air Control by the unit electronic control
Chaos Swing
Defrost control(Heating)
Hot-start Control (Heating)
• 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 and Auto
• Intermittent operation of fan at low speed
• Both the indoor and outdoor fan stops
during defrosting.
•Hot start will be operated after
defrosting ends.
• The indoor fan stops until the
indoor pipe temperature will be
reached at 28°C(82°F).
• 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.
--- Lights up in operation
--- Lights up in Sleep Mode
--- Lights up in Timer Mode
--- Lights up in Defrost Mode or Hot Start Mode (only Heating Model)
--- Lights up during compressor running (only Cooling Model)
OUT
DOOR

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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
ON OFF
SET
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

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Product Specifications(Cooling Only)
* Design and Specifications subject to change without prior notice for product improvement.
Items Unit LS300CE
Power Supply ø, V, Hz 1, 208/230, 60
Cooling Capacity BTU/h 27,000/28,000
Input W 3,450/3,600
Running Current A 16.5/16.0
COMP. Locked Rotor AMP. A A: 68. B: 29
E.E.R BTU/hW 7.79/7.81
Air Circulation m3/min(cfm) 21(740)
Moisture Removal l/h(pts/hr) 3.7(7.8)
Noise Level Indoor, High dB(A) 49
(Sound Med dB(A) 46
Pressure, 1m) Low dB(A) 43
Outdoor, Max dB(A) 63
Features Temperature Control Thermistor
Air Deflection 4-way
Steps, Fan/Cool 3/3
Airflow Direction Control(up&down) Auto
Airflow Direction Control(left&right) Manual
Remocon Type Wireless LCD
Setting Temperature Range, Cooling Mode 64~86°F
Temperature Increment 2°F
Auto Operation(electronic control) Yes
Self Diagnosis Yes
Timer 24hr, On/Of
Sleep Operation Yes
Healthy Dehumidification Mode Yes
Restart Delay minutes 3
Refrigerant(R-22) Charge g(oz) 2300(81)
Power cord AWG #: P*mm2 12:3*2.5
Fuse or breaker Capacity A 30A
Connecting Cable AWG #: P*mm220:4*0.75
Connecting Tube Liquid Side mm(in) 9.52(1/4)
(ø. Socket Flare) Gas Side mm(in) 15.88(1/2)
Length, std m(ft) 7.5(24.6)
Additional Drain Hose(Outer Dia.) mm(in) 15.5(5/8)
Dimensions Indoor mm 1259*349*205
(WxHxD) in 49.6*13.7*8.1
Outdoor mm 870*800*320
in 34.3*31.5*12.6
Net Weight Indoor kg(lbs) 20
Outdoor kg(lbs) 71

(1) Indoor Unit
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Dimensions
W
H
Tubing hole cover
Tubing hole cover
Installation plate
D
Wmm(inch) 1,259(49.6)
Hmm(inch) 349(13.7)
Dmm(inch) 205(8.1)
Model
Dimension
30K SERIES

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MODEL
DIM
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W
L7 L6 L8 L9
D
L1
L2
L3
L10L11
L4L5
H
Gas side
3-way valve
Liquid side
3-way valve
W mm(in ch) 870(34.3)
H mm(in ch) 800(31.5)
D mm(in ch) 320(12.6)
L1 mm(in ch) 370(14.6)
L2 mm(in ch) 340(13.4)
L3 mm(in ch) 25(1.0)
L4 mm(in ch) 775(30.5)
L5 mm(in ch) 25(1.0)
L6 mm(in ch) 546(21.5)
L7 mm(in ch) 162(6.4)
L8 mm(in ch) 162(6.4)
L9 mm(in ch) 54(2.1)
L10 mm(in ch) 74.5(2.9)
L11 mm(in ch) 79(3.1)
30K SERIES
(2) Outdoor Unit

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Refrigeration Cycle Diagram
INDOOR UNIT OUTDOOR UNIT
INDOOR UNIT OUTDOOR UNIT
HEAT
EXCHANGER
(EVAPORATOR)
HEAT
EXCHANGER
(EVAPORATOR)
HEAT
EXCHANGER
(CONDENSER)
HEAT
EXCHANGER
(CONDENSER)
COMPRESSOR
COMPRESSOR
ACCUMU
LATOR
Suction Line
Suction Line
3-WAY VALVE
Evaporator Line
Evaporator Line
3-WAY VALVE
CAPILLARY TUBE
CAPILLARY TUBE
CHECK VALVE
(Heating Model only)
COOLING
HEATING
REVERSING
VALVE
(Heating Model Only)
(1) Cooling Only Models
(2) Cooling & Heating Models

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Pipe length and the elevation
* Capicity is based on standard length and maximum allowance length is the basis of
reliability.
* Oil trap should be installed per 5~7 meters(16.4~23.0ft).
CAUTION
Outdoor unit
Indoor unit
A
B
A
Oil trap
Outdoor unit
Indoor unit B
In case more than 5m (16.4ft)
30k 5/8" 3/8" 7.5(25) 15(50) 30(100) 30(0.32)
(50Hz, 60Hz)
Pipe Size
Capacity
(Btu/h) GAS LIQUID
Additional
Refrigerant
g/m(oz/ft)
Max.
Length
A m(ft)
Max.
Elevation
B m(ft)
Standard
Length
m(ft)

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Wiring Diagram
(1) Indoor Unit (Cooling Only Models, & Heating Models)
MOTOR
SH-CAPA.
YL
PILLAR
TERMINAL
AUTO RESTART FORCED OPERATION
CN-DISP
CN-L/R CN-U/D CN-TH
THERMISTOR
STEP
MOTOR
(UP/DOWN)
STEP
MOTOR
(L/R)
H.V.B ASM
LIMITS S/W
Negative ion
OPTION
STEP
MOTOR
(L/R)
CN-L/R
DISPLAY PCB ASM
3854A20065D
TO OUTDOOR UNIT
BL
3(L1) 4(L2)
5
BR
GN/YL
BL RD RD BR
GN/YL
BR
FUSE
AC250V/T2A
TRIAC
OR
BK
ZNR
CN-POWER
CN-MOTOR
WIRING DIAGRAM

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(2) Outdoor Unit
• Cooling Only Models
• Heating Models
TO INDOOR
UNIT POWER
INPUT
FMo
T/B
REVERSING
VALVE
Comp(B)
OLP
CAPACITOR(B) CAPACITOR(A)
CC
SS
RR
Comp(A)
5RD
BL
BR
BK
YL
YL BR BL BK
RD
RD
BL
BK
BK
BK
BK
OR
OR
GN/YL
BL
BR
FUSE
(250V,5A)
FUSE
(250V,5A)
FUSE(250V,3A)
CN-POWER
CN-FAN
CN-CON
CN-COMP
H
HC CF
CN-LEV
CN-TH2
CN-4WAY
PIPE-IN
PIPE-OUT
TEMP-IN
COIL EXPANSION
RY-HI
RY-COMP(B) RY-COMP(A)
3(L1)
2(L2)
4(L2)
1(L1)
MAIN
PCB ASM
3854A20153X
WIRING DIAGRAM
TO INDOOR
UNIT POWER
INPUT
FMo
T/B
Comp(B)
OLP
CAPACITOR(B) CAPACITOR(A)
CC
SS
RR
Comp(A)
5
RD
BL
BR
BK
YL
YL BR BL BK
RD
RD
BL
BK
BK
BK
OR
OR
GN/YL
BL
BR
FUSE
(250V,5A)
FUSE
(250V,5A)
FUSE(250V,3A)
CN-POWER
CN-FAN
CN-CON
CN-COMP
H
HC CF
CN-LEV
CN-TH2
PIPE-IN
TEMP-IN
COIL EXPANSION
RY-HI
RY-COMP(B) RY-COMP(A)
3(L1)
2(L2)
4(L2)
1(L1)
MAIN
PCB ASM
3854A20153W
WIRING DIAGRAM

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(1) The function of main control
1. Time delay Safety Control
•3min.; The compressor operation is delayed for 3 minutes to balance the pressure of cycle.
(Protection of compressor)
•5sec.; The indoor fan is delayed for 5 seconds, when operating initially, to prevent noises occurred by the vertical
louver and wind.
•2min.; The reversing valve is delayed for 2 minutes to prevent the refrigerant-gas for abnormal noise when the
heating operation is OFF or switched to the other operation mode while compressor is off.
While compressor is running, it takes 3~5 seconds to switch.
2. 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.
Operation Details
INTAKE AIR TEMP.
SETTING TEMP. +1 ° F
(Compressor ON)
SETTING TEMP. -1
° F
(Compressor OFF)
Setting
fan speed Setting
fan speed
More than
3 minutes More than
3 minutes
Setting
fan speed
COMPRESSOR ON OFF ON OFF ON
INDOOR FAN SPEED Low Low
■Protection of the indoor heat exchanger from frosting
•Compressor and outdoor fan stop when indoor pipe temperature is below 0°C(32°F) and restart at the pipe
temperature is above 7°C(45°F).
3. Cooling Operation Mode
•When selecting the Cooling( ) Mode Operation, the unit will operate according to the setting by the
remote control and the operation diagram is shown below.
CLOSED
OPEN
< Cooling Mode >
8°
CLOSED
OPEN
< Heating Mode >
8°

. Auto Operation (Electronic control mode)
•The operation procedure is shown below. (Cooling & Heating Model)
❋ If initial mode is decided, that mode is continued without the room temperature changing.
■Auto Operation for Cooling
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Press Start/Stop Button
Select Auto Operation Mode
Check the Room temperature
Operation mode
Indoor fan speed are decided automatically by the unit electronic control.
Setting temperature
Intake-air
temperature
Operation Mode
Over below
70 ° F76 ° F
Soft Dry
below 70 ° F
Heating
Over 76 ° F
Cooling
~
INTAKE AIR TEMP.
SETTING TEMP. +1°F
(Compressor OFF)
SETTING TEMP. -1°F
(Compressor ON)
COMPRESSOR ON OFF ON OFF
INDOOR FAN SPEED The electronic control operation
Intake-air Temperature Setting Temperature
Over 78°F77°F
Over 76°F~below 78°F Intake air -1°C
Over 72°F~below 76°F Intake air -0.5°C
Over 68°F~below 72°F Intake air temperature
below 64°F64°F
Over 64°F~below 86°F Electronic control
below 64°F64°F
over 86°F86°F
Operation Condition
When Auto Operation
initial start Controlled by
the electronic
control
In this mode,
when pressing
the vertical air
direction control
button, vertical
louver swings up
and down
automatically.
Fan Speed Air Direction Control
When pressing room
temperature setting
button during Auto
Operation

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■ Auto Operation for Dehumidification(only Heating Model)
•The Setting temperature will be same that of the auto operation for cooling.
- Compressor ON temperature; Setting temperature +2°F
- Compressor OFF temperature; Setting temperture -1°F
■ Auto Operation for Heating(only Heating Model)
- Compressor ON temperature; Setting temperature
- Compressor OFF temperature; Setting temperature +6°F
Intake-air temp. below 68°F Over 68°F~below 70°F over 86°F
Setting temp. 68°F Intake air temperature +1°F86°F
■ Vertical louver auto operation : During Auto Operation, pressing the chaos swing button makes the horizon-
tal louvers swing up and down automatically.
If you want to stop auto-swing, press chaos swing button again.

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5. Healthy Dehumidification
•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.

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6. Heating Operation Mode(only Heating Model)
The unit will operate according to the setting conditions by the remote controller.
The operation diagram is shown below.
INTAKE AIR TEMP.
SETTING TEMP. +6
° F
(Compressor OFF)
SETTING TEMP.
(Compressor ON)
Selecting
fan speed Selecting
fan speed
ABA
minimum
10sec.
minimum
1 min.
minimum
10sec.
COMPRESSOR ON OFF ON OFF
•A point; While the indoor pipe temperature is higher than 95°F, indoor fan operates at low speed. When the
indoor pipe temperature becomes lower than 95°F, indoor fan stops.
•B point; When the indoor pipe temperature is higher than 38°C(100°F), fan operates at selected fan speed.
INDOOR FAN SPEED
Low OFF Low Low OFF
OFF OFFLOW
ON
Selecting
fan speed
INDOOR PIPE
TEMP. 82°F
78°F
1min
INDOOR FAN SPEED
COMPRESSOR
■ Hot-Start Control
•The indoor fan stops until the indoor pipe temperature will be reached at 82°F.
•During heating operation, if indoor pipe temperature falls below 78°F fan stops.
•The operation diagram is shown below.

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7. Cooling or Heating Mode with Sleep Mode Auto Control
•When selecting the Cooling( ) or the Heating( ) combined with the Sleep Mode Auto Control( ), the
operation diagram is as following.
■ Cooling Mode with the Sleep Mode
•The setting temperature will be automatically raised by 2°F 30 minutes later and by 4
° F 1 hour later.
•The operation will be stopped after 1, 2, 3, 4, 5, 6, 7 hours.
■ Heating Mode with the Sleep Mode(only Heating Model)
•The operation will be stopped after 1, 2, 3, 4, 5, 6, 7 hours.
INTAKE AIR TEMP.
SETTING TEMP. +1 ° F
(Compressor ON)
SETTING TEMP. -1 ° F
(Compressor OFF)
30 minutes 30 minutes
More than
3 minutes
2°F
2°F
More than
3 minutes
COMPRESSOR ON OFF ON OFF ON
INDOOR FAN SPEED Low Low Low Low Low
SETTING TEMP. +6 °
F
(Compressor OFF)
SETTING TEMP.
(Compressor ON)
COMPRESSOR ON OFF ON OFF ON OFF
INDOOR FAN SPEED Med Low or OFF Med Low or OFF Med Low or OFF
INTAKE AIR TEMP.
More than
3 minutes More than
3 minutes More than 3 minutes

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8. Forced Operation
To operate the appliance by force in case that the remote controller is
lost, the forced operation button is on the main unit of the appliance to
operate the appliance in the standard conditions.
•Press the forced operation button, the forced operation is carried out.
•Press the forced operation button once again to stop operation.
In case the power comes on again after power failure on the Forced
Operation position, the operating conditions are automatically set as fol-
lows:
During Forced Operation, the initial mode continues.
9. AUTO RESTART
In case the power comes on again after a power failure, Auto Restarting
Operation is the function to operate procedures automatically to the pre-
vious operating conditions.
If you want to use this operation. The autorestart button is on the main
unit of the appliance in the standard condition.
•press the auto restart button, to make this function active.
•If you do not want to use this operation, free the auto restart button
once again.
Cooling Heat pump Model
Model
Room Temp. ≥24°C(76°F)
21°C(70°F) ≤Room Temp. < 24°C(76°F) Room Temp. < 21°C(70°F)
Operating mode Cooling Cooling Healthy Dehumidification Heating
Indoor FAN Speed High High Healthy Dehumidification Rule High
Setting Temperature
22°C(72°F) 22°C(72°F) 23°C(74°F) 24°C(76°F)
AUTO
RESTART
FORCED
FORCED
OPERATION
OPERATION
FORCED
OPERATION
AUTO
RESTART
AUTO
RESTART
FORCED
OPERATION

- 20 -
Display Function
Self-diagnosis Function
Signal Receptor
Receives the signals from the remote control.(Signal receiving sound: two short beeps or one long beep.)
Operation Indication Lamps
On/Off : Lights up during the system operation.
Timer or Sleep Mode : Lights up during Timer operation or Sleep mode.
Defrost Mode : Lights up during Defrost Mode or Hot
Start operation. (Heat pump model only)
Outdoor unit operation : Lights up during outdoor unit operation. (Cooling model only)
Auto Restart Mode : Lights up during if Restart Button is pressed.
Auto Restart Button : In failure of electric power, if the button is pressed the unit runs as previous
setting operation when power returns.
Forced Operation Button : Operation starts, when this button is pressed and stops when you press the
button again.
3sec 3sec 3sec
(once)
3sec 3sec
(twice)
3sec
(5times)
Error
Code
1
2
5
Error LED
(Indoor body operation LED) Error contents
•Indoor room temperature
thermistor open/short
•Indoor pipe temperature
thermistor open/short.
•Outdoor pipe temperature
thermistor open/short.
•Poor communication.
•Indoor TH assy check
•Outdoor TH assy check
•Communication line/circuit
check
SVC check point