LG LC240CP User manual

LG
Ceiling Cassette
Air Conditioner
SERVICE MANUAL
LG
CAUTION
website http://www.lgservice.com
e-mail http://www.lgeservice.com/techsup.html
• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
• ONLY FOR AUTHORIZED SERVICE PERSONNEL.

2Ceiling Cassette Air Conditioner
TABLE OF CONTENTS
Table of contents Page
1. Models List .......................................................................................................................3
2. Safety Precautions ...........................................................................................................4
3. Feature & Benefits ...........................................................................................................8
4. List of Functions .............................................................................................................11
5. Function of Remote Control ...........................................................................................12
6. Specifications .................................................................................................................14
7. Dimensional Drawings ...................................................................................................16
8. Wiring Diagrams.............................................................................................................20
9. Refrigerant Cycle Diagrams ...........................................................................................22
10. Installation ....................................................................................................................23
11. Trouble Shooting Guide................................................................................................33
12. (3-Way)Valve ................................................................................................................49
13. Electronic Control Device.............................................................................................53
14. Exploded View and Replacement Parts List ................................................................54

Models List
Service Manual 3
Nominal Capacity Indoor Units Outdoor Units Power Supply
Btu/h Type Model Name Model Name Ø,V,Hz
24K Ceiling Cassette LCN240CP LCU240CP 1Ø, 208-230V, 60Hz
38K Ceiling Cassette LCN380CP LCU380CP
1.1 Cooling Only
Models List

Safety Precautions
4Ceiling Cassette Air Conditioner
Safety Precautions
To prevent injury to the user or other people and property damage, the following instructions must
be followed.
■Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is
classified by the following indications.
■Meanings of symbols used in this manual are as shown below.
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage to properties only.
■Installation
Be sure not to do.
Be sure to follow the instruction.
Do not use a defective or under-
rated circuit breaker. Use this
appliance on a dedicated circuit.
• There is risk of fire or electric
shock.
Always ground the product.
• There is risk of fire or electric
shock.
Install the panel and the cover
of control box securely.
• There is risk of fire or electric
shock.
Always install a dedicated cir-
cuit and breaker.
• Improper wiring or installation may
cause fire or electric shock
Use the correctly rated break-
er or fuse.
• There is risk of fire or electric
shock.
Do not modify or extend the
power cable.
• There is risk of fire or electric
shock.

Safety Precautions
Service Manual 5
■Operational
Do not install, remove, or re-
install the unit by yourself
(customer).
• There is risk of fire, electric shock,
explosion, or injury.
Be cautious when unpacking
and installing the product.
• Sharp edges could cause injury.
Be especially careful of the case
edges and the fins on the con-
denser and evaporator.
For installation, always con-
tact the dealer or an
Authorized Service Center.
• There is risk of fire, electric shock,
explosion, or injury.
Do not install the product on a
defective installation stand.
• It may cause injury, accident, or
damage to the product.
Be sure the installation area
does not deteriorate with age.
• If the base collapses, the air condi-
tioner could fall with it, causing
property damage, product failure,
and personal injury.
Do not let the air conditioner
run for a long time when the
humidity is very high and a
door or a window is left open.
• Moisture may condense and wet or
damage furniture.
Do not touch(operate) the
product with wet hands.
• There is risk of fire or electrical
shock.
Do not place a heater or other
appliances near the power
cable.
• There is risk of fire or electric
shock.
Do not let electric parts of the
product get wet.
• There is risk of fire, failure of the
product, or electric shock.

Safety Precautions
6Ceiling Cassette Air Conditioner
■Installation
Do not open the inlet grill of the product during
operation. (Do not touch the electrostatic filter,
if the unit is so equipped.)
• There is risk of physical injury, electric shock, or prod-
uct failure.
Be cautious that water could not enter the
product.
• There is risk of fire, electric shock, or product damage.
Always check for gas (refrigerant) leakage after
installation or repair of product.
• Low refrigerant levels may cause failure of product.
Install the drain hose to ensure that water is
drained away properly.
• A bad connection may cause water leakage.
Do not store or use flammable gas or com-
bustibles near the product.
• There is risk of fire or failure of product.
If strange sounds, or small or smoke comes
from product. Turn the breaker off or discon-
nect the power supply cable.
• There is risk of electric shock or fire.
Gasolin

Safety Precautions
Service Manual 7
Keep level even when installing the product.
• To avoid vibration or water leakage.
Use two or more people to lift and transport
the product.
• Avoid personal injury.
Use a soft cloth to clean. Do not use harsh
detergents, solvents, etc.
• There is risk of fire, electric shock, or damage to the
plastic parts of the product.
Do not touch the metal parts of the product
when removing the air filter. They are very
sharp!
• There is risk of personal injury.
Do not step on or put anyting on the product.
(outdoor units)
• There is risk of personal injury and failure of product.
Do not insert hands or other objects through
the air inlet or outlet while the product is oper-
ated.
• There are sharp and moving parts that could cause
personal injury.
90˚
Wax
Thinner
■Operational

8Ceiling Cassette Air Conditioner
Features & Benefits
Environment Friendly Refrigerant :
- LG Ceiling Cassette Air Conditioners uses environ-
ment friendly refrigerant, which don't do any harm to
the environment.
Plasma Air Purifier :
- It removes not only microscopic contaminants &
dust, but also house mites, pollen, and pet fur to help
preventing allergic diseases like asthma.It provides
odor free, dust free and allergy free air.
Group Control :
- It enables to control as much as 16 units with the
help of one wired remote controller. All the units will
follow same setting of temperature & other sub func-
tions.
Central Control :
- It enables to control 16 x 8 = 128 units with the help
of 8 controllers. All units can be put on and off from
one Central Room. For Setting Temperature, Fan
Speed and other sub functions, access the respec-
tive LCD wired remote controller of each unit.
Jet Cool :
-In this mode, quick and fast cooling is done. Cold and
high velocity air is supplied to the room till the indoor
temperature reaches 18°C. The unit will continue to
run in jet cool mode till the Indoor temperature reach-
es 18°C.
12 16........
........
IonizerPre-filter
Dust particles
dusts
Odour
Dust
electrode
discharge
Odor molecule
+6.5KV
discharge
aluminum coated
electrode(-)
(3.25KV discharge)
Generating
plasma
++
+
+
+
Dusts Collection
Polluted
Air
Purified
fresh Air
Main
PCB
Controller
# 1
Controller
# 2
Controller
# 8
M
1
Sub
1
M
2
Sub
2
M
16
Sub
16
M
17
Sub
17
M
18
Sub
18
M
128
Sub
128
Features & Benefits

Swirl Swing
- It is the function for comfort cooling/heating operation.
- The diagonal two louvers are opened the
more larger than the other louvers.
After one minute, it is opposite.
Space Control
Vanes angle can be controlled by pair, considering its
installation environment.
- For example direct drafts can be annoying, leading
to discomfort and reduced productivity vane control
helps to eliminate this problem.
- Easily controlled by wired remote control.
- Air Flow can be controlled easily regarding any
space environment.
Auto Restart Operation :
- Whenever there is electricity failure to the unit, and after resumption of the power, unit will start in the same
mode prior to the power failure. Memorized condition are on / off condition, operating mode (cooling/heating),
set temperature and fan speed.The unit will memorize the above conditions and start with same memorized
condition.
Two Thermistor Control :
- There may be a significant difference between the temperature taken at the installed product and indoor tem-
perature. Two thermistor control provides option to control temperature by referring any of the two tempera-
tures. With the help of the slide switch at the back of the LCD wired remote controller, selection of the desired
thermistor for controlling the unit can be done. One thermistor is in the Indoor unit & the other one is in the
LCD wired remote.
Service Manual 9
Features & Benefits
71
Vane 2
Swirl Swing(New)4- Open(Conventional)
Swirl Swing(New)4- Open(Conventional)
2.4% 4.8%100% Improved
Comparison of Air Flow Types
Comparison of Floor
Temp. Distribution(20°C)
Vane 1 Close OpenOpen
Open
Open
Open
Close CloseOpen
Vane 3 Close Open Close CloseOpen
OpenOpen Close CloseOpen
Vane 2
OpenOpen
Time
Close CloseOpen
Vane 4
Vane 1
Vane 3
Vane 2
Time
Vane 4
Vane 3
Vane 4
Vane 1

10 Ceiling Cassette Air Conditioner
Features & Benefits
High Ceiling Operation
- According to the height of ceiling installation, it pro-
vides variability of indoor fan motor rpm. If the height
of installation is low then you can adjust low rpm of
indoor fan motor. On the other hand if the height of
the installation is high you can adjust high rpm of
indoor fan motor. Selection of speed can be done by
slide switch at the back of the LCD wired remote.
ex:
Water Drain Pump :
- In some of the places natural drainage is not possi-
ble. For such places drain pump is very useful. It
removes condensed water from the unit.
Time Delay Safety Function :
- It delays restarting of the compressor by three min-
utes thereby preventing damage to the compressor.
Zero Standby Power:
- Due to SMPS (Switching Modulation Power Supply)
technology, there is almost zero power consumption
in the standby mode.
Child Lock Function:
-It prevents the children or others from tampering the
control buttons. Unit can be controlled by the wireless
remote controller. This can be easily set by pressing
timer key & Min key simultaneously. After child lock is
set, pressing any key will displaye CL on the LCD for
3 seconds and all the keys will be ineffective.
Self Diagnosis Function:
- This function provides diagnosis of the unit. An
error code will be displayed on the LCD wired
remote controller & diagnosis can be done as per
the code indication. The same is also printed on
key cover of the LCD wired remote controller.
30m
30m
5~6W
Others LG
0.5W
CHILD LOCK
-Display
Selection Height RPM
Lower 2.4m 700/600/500
Standard 2.7m 750/650/550
Higher 3.0m 800/700/600