LG LC240CP User manual

Ceiling Cassette

Air Conditioner

SERVICE MANUAL

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

Sub

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

Vane 2

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

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

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

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