LG JTNC246PLE0, JTNC368NLE0, JTNC488MLE0 User Manual

LG Ceiling Cassette
Air Conditioner

OWNER'S MANUAL

LG

IMPORTANT

• Please read this owner's manual carefully and thoroughly
before installing and operating your room air conditioner.

• Please retain this owner's manual for future reference after
reading it thoroughly.

website http://www.lgservice.com

Dear Owner
Thank you for installing LG Air Conditioner.
Your best choice guarantees you a great
performance and service to make your life
comfortable & pleasant.

2 Ceiling Cassette Air Conditioner

Ceiling Cassette Air Conditioner Owner’s Manual

TABLE OF CONTENTS

FOR YOUR RECORDS

Write the model and serial numbers here:

Model #

Serial #

You can find them on a label on the side of each unit.

Dealer's Name

Date Purchased

■ Staple your receipt to this page in the event you need
it to prove date of purchase or for warranty issues.

READ THIS MANUAL

Inside you will find many helpful hints on how to use
and maintain your air conditioner properly. Just a little
preventive care on your part can save you a great deal
of time and money over the life of your air conditioner.

You'll find many answers to common problems in the
chart of troubleshooting tips. If you review our chart of

Troubleshooting Tips first, you may not need to call
for service at all.

PRECAUTION

• Contact the authorized service technician for

repair or maintenance of this unit.

• Contact the installer for installation of this unit.

• The air conditioner is not intended for use by

young children or invalids without supervision.

• Young children should be supervised to ensure

that they do not play with the air conditioner.

• When the power cord is to be replaced,

replacement work shall be performed by
authorized personnel only using only genuine
replacement parts.

• Installation work must be performed in

accordance with the National Electric Code by
qualified and authorized personnel only.

Safety Precautions.........................3

Prior to Operation ..........................8

Introduction ....................................9

Electrical Safety ...........................10

Operating Instructions.................11

Maintenance and Service ............30

Owner's Manual 3

Safety Precautions

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.

Be sure not to do.

Be sure to follow the instruction.

■ Installation

Do not use a defective or
underrated circuit breaker.
Use this appliance on a
dedicated circuit.

• There is risk of fire or electric

shock.

For electrical work, contact
the dealer, seller, a qualified
electrician, or an Authorized
Service Center.

• Do not disassemble or repair the
product. 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
circuit and breaker.

• Improper wiring or installation
may cause fire or electric shock

Use the correctly rated
breaker or fuse.

• There is risk of fire or electric
shock.

4 Ceiling Cassette Air Conditioner

Safety Precautions

■ Operation

Do not modify or extend the
power cable.

• There is risk of fire or electric
shock.

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
condenser and evaporator.

For installation, always contact 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
conditioner could fall with it,
causing property damage,
product failure, and personal
injury.

Do not plug or unplug the
power supply plug during
operation.

• There is risk of fire or electric
shock.

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 and electric
shock.

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.

Take care to ensure that power
cable could not be pulled out or
damaged during operation.

• There is risk of fire or electric
shock.

Do not place anything on
the power cable.

• There is risk of fire or electric
shock.

Owner's Manual 5

Safety Precautions

Do not allow water to run
into electric parts.

• It may cause There is risk of fire,
failure of the product, or electric
shock.

Do not store or use flammable
gas or combustibles near the
product.

• There is risk of fire or failure of
product.

Do not use the product in a
tightly closed space for a
long time.

• Oxygen deficiency could occur.

When flammable gas leaks,
turn off the gas and open a
window for ventilation
before turn the product on.

• Do not use the telephone or turn
switches on or off.
There is risk of explosion or fire

If strange sounds, or small or
smoke comes from product. Turn
the breaker off or disconnect the
power supply cable.

• There is risk of electric shock or
fire.

Stop operation and close the window
in storm or hurricane. If possible,
remove the product from the window
before the hurricane arrives.

• There is risk of property damage,
failure of product, or electric shock.

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 product failure.

When the product is soaked
(flooded or submerged),
contact an Authorized
Service Center.

• There is risk of fire or electric
shock.

Be cautious that water could
not enter the product.

• There is risk of fire, electric shock,
or product damage.

Ventilate the product from time to time when
operating it together with a stove, etc.

• There is risk of fire or electric shock.

Turn the main power off when cleaning or
maintaining the product.

• There is risk of electric shock.

Gasolin

6 Ceiling Cassette Air Conditioner

Safety Precautions

■ Installation

■ Operation

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.

Keep level even when
installing the product.

• To avoid vibration or water
leakage.

Do not install the product where the
noise or hot air from the outdoor unit
could damage the neighborhoods.

• It may cause a problem for your
neighbors.

Use two or more people to
lift and transport the
product.

• Avoid personal injury.

Do not install the product
where it will be exposed to sea
wind (salt spray) directly.

•

It may cause corrosion on the
product. Corrosion, particularly on
the condenser and evaporator fins,
could cause product malfunction or
inefficient operation.

90°

When the product is not be used for a long
time, disconnect the power supply plug or
turn off the breaker.

• There is risk of product damage or failure, or
unintended operation.

Take care to ensure that nobody could step
on or fall onto the outdoor unit.

• This could result in personal injury and product
damage.

Do not expose the skin directly to cool air
for long periods of time.
(Don't sit in the draft.)

• This could harm to your health.

Do not use the product for special purposes, such as
preserving foods, works of art, etc. It is a consumer
air conditioner, not a precision refrigeration system.

• There is risk of
damage or
loss of property.

Owner's Manual 7

Safety Precautions

Do not block the inlet or
outlet of air flow.

• It may cause product failure.

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.

Always insert the filter securely.
Clean the filter every two weeks
or more often if necessary.

• A dirty filter reduces the efficiency
of the air conditioner and could
cause product malfunction or
damage.

Do not insert hands or other
objects through the air inlet or
outlet while the product is operated.

• There are sharp and moving parts
that could cause personal injury.

Do not drink the water
drained from the product.

• It is not sanitary and could cause
serious health issues.

Use a firm stool or ladder
when cleaning or
maintaining the product.

• Be careful and avoid personal
injury.

Replace the all batteries in the
remote control with new ones
of the same type. Do not mix
old and new batteries or
different types of batteries.

• There is risk of fire or explosion

Do not recharge or disassemble the batteries.
Do not dispose of batteries in a fire.

• They may burn or explode.

If the liquid from the batteries gets onto your
skin or clothes, wash it well with clean water. Do
not use the remote if the batteries have leaked.

• The chemicals in batteries could cause burns or
other health hazards.

Thinner

Wax

8 Ceiling Cassette Air Conditioner

Prior to Operation

Prior to Operation

1. Contact an installation specialist for installation.

2. Plug in the power plug properly.

3. Use a dedicated circuit.

4. Do not use an extension cord.

5. Do not start/stop operation by plugging/unplugging the power cord.

6. If the cord/plug is damaged, replace it with only an authorized replacement part.

1. Being exposed to direct airflow for an extended period of time could be hazardous to
your health. Do not expose occupants, pets, or plants to direct airflow for extended
periods of time.

2. Due to the possibility of oxygen deficiency, ventilate the room when used together
with stoves or other heating devices.

3. Do not use this air conditioner for non-specified special purposes (e.g. preserving
precision devices, food, pets, plants, and art objects). Such usage could damage the
items.

1. Do not touch the metal parts of the unit when removing the filter. Injuries can occur
when handling sharp metal edges.

2. Do not use water to clean inside the air conditioner. Exposure to water can destroy
the insulation, leading to possible electric shock.

3. When cleaning the unit, first make sure that the power and breaker are turned off.
The fan rotates at a very high speed during operation. There is a possibility of injury if
the unit’s power is accidentally triggered on while cleaning inner parts of the unit.

For repair and maintenance, contact your authorized service dealer.

Preparing for operation

Usage

Cleaning and maintenance

Service

Owner's Manual 9

Introduction

Introduction

This symbol alerts you to the risk of electric shock.

This symbol alerts you to hazards that could cause harm to the
air conditioner.

This symbol indicates special notes.

NOTICE

Features

Anti-bacteria

Anti-bacteria

Air Outlet
Air Inlet

Remote

Controller

Symbols used in this Manual

WARNING: This appliance should be installed in accordance with national wiring
regulations. This guide acts as a guide to help to explain product features.

10 Ceiling Cassette Air Conditioner

Electrical Safety

Electrical Safety

WARNING: This appliance must be properly grounded.

To minimize the risk of electric shock, you must alway plug into a grounded oulet.

WARNING: Do not cut or remove the grounding prong from the
power wire.

WARNING: Attaching the adapter ground terminal to the wall
receptacle cover screw does not ground the appliance unless the
cover screw is metal and not insulated, and the wall receptacle is
grounded through the house wiring.

WARNING: If you have any doubt whether the air conditioner is
properly grounded, have the wall receptacle and circuit checked by
a qualified electrician.

Preferred method

Ensure proper ground
exists before use

Owner's Manual 11

Operating Instructions

Operating Instructions

Indoor Unit, Outdoor Unit

Anti-bacteria

Outdoor Unit

Air Intake

(side, rear)

Connecting Wire

Drain Hose

Power Wire

Connection Tube

Air Outlet

Vents

Heat pump model: Cassette Type Air Conditioner for cooling and heating
Cooling model: Cassette Type Air Conditioner for cooling

Operation Indication Lamps

Forced Operation : Operation procedures when remote control can't be used.

Defrost Mode : Lights up during defrost mode or hot start operation.

(heat pump model only)

Timer : Lights up during timer operation.

Signal Receptor : Receives the signal from remote control (signal receiving sound:

two short beeps and one long beep)

Filter Sign : Lights up after 2400 hours from the time of first operation.

On/Off : Lights up during system operation.

Air Outlet
Air Inlet

Remote

Controller

Anti-bacteria

Anti-bacteria

12 Ceiling Cassette Air Conditioner

Operating Instructions

Name and Function of Remote Controller

Operation indication screen
Set temperature button
Wireless remote controller

Receiver

• Some kind of product could not
receive wireless signal.

Ventilation button
Operation mode selection

button
Sub-function button
Function setting button
Exit button
On/ Off button
Room temperature button
Fan speed button
Air flow button
Reservation/ Time setting

button
Setting/ Cancel button
Up, Down, Left, Right
Reset Button

1

9

11

12

3

5

6

2

4 10

16

13

14

7

8

15

12V SIG GND

1
2
3

4
5

6
7
8

9
10
11
12
13

14
15
16

Connection Cable

(1EA, 10m)

Remote controller screw

(4 EA)

Owner's / Installation

manual

Wired remote controller

installation board

Accessory

❊ Some functions may not be operated and displayed depending on the product type.

❊ For detail usage except 'PQRCUSA0' model, refer to each manual.

PQRCUSA0

Owner's Manual 13

Operating Instructions

Cooling mode (Standard operation)

Cooling mode (Power Cooling)

It makes the room cool using pleasant and fresh air

It makes the room cool using pleasant and fresh air quickly

What is power cooling?

• Desired temperature: 18°C

• Fan Speed: special high cool (Power air)

❈ It quickly lowers the room temperature by

operating.

1. Press button to turn on
airecondition

1. Press button to turn on
airecondition

2. Press button to select Cooling
operation mode

3. Press button continuously until
"Po" displayed

2. Press button to select Cooling
operation mode.

3. Adjust the desired temperature by pressing

buttons

Press button to check the
Room temperature
When setting the desired
temperature higher than room
temperature, only ventilation wind
is blow out instead of cooling wind.

❖ Setting Temp Range : 18˚C~30˚C (64˚F~86˚F)

14 Ceiling Cassette Air Conditioner

Operating Instructions

Heating mode (Heat pump model only)

Dehumidification

1. Press button

2. Press button to select Heating
operation mode.

3. Adjust the desired temperature by

pressing buttons.
When setting the desiredtemperature
lower than room temperature, there is
only ventilation wind.

1. Press button, then

2. Press button to select
Dehumidification mode.
The temperature setting can not be
adjusted during operation this mode.

3. Press the button to select airflow
rate SLO → LO → MED → HI →

(NONE)→

(The lists depends on products

function)

In rainy season or high humidity climate, it is possible
to operate simultaneously dehumidifier and cooling
mode to remove humidity effectively.

The airflow rate selection can be different or inactive
according to product.

❖ Setting Temp Range : 16˚C~30˚C (60˚F~86˚F)

❖ NONE : Power level of Fan Speed

Owner's Manual 15

Operating Instructions

Auto Change Over mode (Heat pump model only)

Auto Operation mode

1. Press button

1. Press button

2. Press button to select Auto
Operation mode.

3. Incase of operating under only
cooling mode, set '0' as standard
level, we can adjust the temperature
from step -2 to step 2

During operating Auto Operation mode:

• FAN SPEED button can be used.

• Manually other operation mode can be changed.

2. Press button to select Auto
Change Over mode.

3. The setting temperature as the right
side picture can be set in both
cooling/ heating model

❖ Setting Temp Range : 18˚C~30˚C (64˚F~86˚F)

Please select the code defend on your feeling.

Currently When feeling When feeling When feeling When feeling When feeling

feeling cold slightly cold moderate slightly hot hot

code 2 1 00 -1 -2

16 Ceiling Cassette Air Conditioner

Operating Instructions

Fan mode

1. Press button

2. Press button.

3. Press the button to select airflow
rate SLO → LO → MED → HI →

(NONE)→
(The lists depends on products

function)

• When operate wind mode, the outdoor compressor
doesn't work

• FAN operation doesn't bring out cold air but air from
regular fan comes out.

• Have a function to circulate the indoor as it sends
out the air that doesn't have much temperature
difference with indoor.

Owner's Manual 17

Operating Instructions

Temperature setting/ room temperature check

We can simply adjust the desired

1

temperature.

• Press the buttons to adjust the
desired temperature.

: Increase 1˚C or 2˚F per one time
pressing
: Decrease 1˚C or 2˚F per one time
pressing

Room temp: Indicate the current room
temperature.
Set temp: Indicate the temperature that
user want to set.

Depend on what kind of controller, the
desired temperature can be adjusted at

0.5˚C or 1˚F.

Cooling operation: The cooling mode
doesn't work if
desired temperature
is higher than room
temperature Please
lower the desired
temperature.
Heating operation: The heating mode
doesn't work if
desired temperature
is lower than room
temperature Please
increase the desired
temperature.

Whenever press button, the room

2

temperature will be displayed within 5
seconds.
After 5 seconds, it turns to display the
desired temperature.
Because of location of remote controller,
the real room temperature and the this
displayed value can be different

18 Ceiling Cassette Air Conditioner

Sub function : Plasma Purification

Repeat pressing button
until icon flash.

1

Operate or cancel Plasma
Purification function by pressing
button.

( icon appears/disappears on
display part up
to selection )

2

After setting, press button
to exit.

3

Operating Instructions

Airflow setting

1. Press buttons to set the desired airflow
direction.

• → → →

• Display of these lists depends on products

function,

We can simply adjust the desired airflow rate

Symbol Description

Swril : vane paired opend cross

Up·Down : Vane move from up to down

automatically and continuously

Left·Right : Vane move from left to right

automatically and continuously

Details:

When turn the machine off, Plasma function is off (And also off when restart indoor)

In case of such model that has no Plasma sub function, it doesn't appear when pressing button.

❈ Some functions may not be operated and displayed

depending on the product type.

Owner's Manual 19

Operating Instructions

Function setting : Filter Sign Clear

Function setting : Child Lock

This function is to clear the indicator of
indoor filter cleaning.

• Press button

• Repeat pressing button until the icon
flash.

• When the flashing, press the button to clear
this display.

When filter is covered by dust, it will reduce
cooling/ heating efficiency and
accumulate more electric power.
Therefore, do clean the filter whenever
cleaning time is expired.

This function is to prevent children or
other people from using indoor.

• Press button

• Repeat pressing button until the
LOCK icon flash.

• When the button flashing, press the button to
set this function.

• When setting this function, the icon will be

displayed whenever entering any operation
except for Room temperature access. However,
it is possible to control normally by wireless
remote controller.

To release this setting, keep

pressing button until the

icon flash and then enter

the button.

20 Ceiling Cassette Air Conditioner

Operating Instructions

Function setting : Elevation grill

This function is to move the indoor filter
up/ down for cleaning filter.

The setting is able to apply only to
product that has this function

• Press button

• Repeat pressing button until the icon
flash

• Press button to control the grill Up/
Down or stop it

• button: move grill up from stopping or stop
grill from moving

• button: move grill down from stopping or
stop grill from moving.

Indication with LCD: Up-UP,
Down-DN, Stop-SP

3. After setting, press button to exit or system

will automatically release without input after 60
seconds.

Details:

In case of such model that has no this
sub function, it doesn't appear when
pressing SUBFUNCTION button.

Owner's Manual 21

Operating Instructions

1. Press button

2. Repeat pressing button until

icon flash.

Ex) Setting second Vane Angle as 'P3'

3. Press button to select
active vane: 1/2/3/4/All

1-4: control individually each vane
All: control all vane with the

same duration

4. Press button to select
Vane number/ Vane angle.

Vane angle : 6 Step(P1~P6) & Sd
Sd : Standard angle

5. Press button to adjust
the angle value

This function is to adjust angle at which airflow is blow out.

Function setting : Vane Angle Control

22 Ceiling Cassette Air Conditioner

Operating Instructions

Setting Current Time

1. Keep pressing button for 4 secs
to enter Setting current time mode
(the '▼' Segment flashing)

2. Press key to adjust the
current month/day

3. Press key to move to AM/ PM
setting mode (the 'AM/ PM
segment will flash).

4. Setting AM/ PM value by

pressing button.

5. Press button to move to
'Hour' setting mode
(the 'Hour' segment will flash)

6. Setting Hour value by

pressing button.

7. Press button to move to
'Minute' setting mode
(the 'Minute' segment will flash)

8. Setting Minute value by

pressing button.

9. Press button to finish

10. In the process, press key to

release and exit from setting mode
(In case of exit with incomplete
information, it will return to the
previous setting )

Owner's Manual 23

Operating Instructions

Programming : Setting Simple Reservation

1. Press button to enter the

Programming mode (the segment
flashing)

If the indoor is ON, we can make the reservation
for turning OFF. In reserve, if the indoor is OFF,
we can set the timer for turning ON. The
reservation time is from 1 to 7 hours.

2. Press button to adjust
reservation time.

3. Press button to finish setting.

4. In case of using wireless remote controller, the
time reservation setting unit is every 10 minutes.
With wired remote controller, this value is
adjusted by every hour. But, in fact, it can
control with accuracy up to 10 minutes.

Ex.) By wireless remote controller we can set
the timer for turning OFF after 1 hour 10
minutes. It displays 2 hour on wired remote
controller but in fact, it will operate this
command after 1 hour 10 minutes.

5. Adjust the reservation time after finish
reservation setting will release the previous one.

In case of there is not any reservation setup on system, it is possible to make a SIMPLE reservation
on indoor unit.

24 Ceiling Cassette Air Conditioner

Operating Instructions

Programming : Setting Sleep Reservation

1. Press button to enter the
Programming mode

2. Repeat pressing button to enter the SLEEP

reservation setting mode (the segment
flashing)

3. Press button to adjust
reservation time
The SLEEP reservation time
is from 1 to 7 hours

4. Press button to finish setting.
Whenever reservation is done,

the icon will flash
When this setting is released,

the icon will disappear.

5. Adjust the reservation time after finish
reservation setting will release the previous one.

This function is able to turn off Air conditioner when sleeping or after some hours.

Please set a suitable time for sleep reservation (turning cooling for long time may be harmful to
health)

Owner's Manual 25

Operating Instructions

Programming : Setting ON Reservation

1. Press button

2. Repeat pressing button to enter
the ON reservation setting mode

(the segment flashing)

3. Press button to adjust
AM/ PM setting

4. Press button to Hour
setting mode.
When the Hour icon flash,
please setting time
The setting range is within 1~12

5. Press button to shift to
Minute setting mode
When the Minute icon flash,
please setting minute the
setting range is within 00~59

6. Press button to finish setting.

This function is able to turn air conditioner ON after a setting time.

26 Ceiling Cassette Air Conditioner

Operating Instructions

Programming : Setting OFF Reservation

1. Press button

2. Repeat pressing button to enter
the OFF reservation setting mode

(the segment flashing)

3. Press button to adjust
AM/ PM setting

4. Press button to shift to
Hour setting mode.
When the Hour icon flash,
please setting time
The setting range is within 1~12

5. Press button to shift to
Minute setting mode
When the Minute icon flash,
please setting minute the
setting range is within 00~59

6. Press button to finish setting.

This function is able to turn air conditioner OFF after a setting time.

Owner's Manual 27

Operating Instructions

Programming : Weekly Reservation

1. Press the button to enter the
reservation setting mode.

2. Repeat pressing button to enter
the weekly reservation setting mode

(the segment flashing)

3. Set the ON/ OFF reservation for
day in week

- Press to adjust timing and

Left/ Right to shift to next

setting mode

- A day is considered as

non-reservation if there is not
any time reservation within.

4. Press button to finish setting.

The weekly reservation is active after setting current time

28 Ceiling Cassette Air Conditioner

Operating Instructions

Programming : Holiday Reservation

1. Press button to enter the
reservation setting mode

2. Repeat pressing button to enter
the holiday reservation setting mode

(the segment flashing)

3. Press button to move to
holiday position.

4. Press button to set or
release a selected day as
holiday or not.
(

❊ the holiday is indicated

with a underline)

5. If there is any holiday from Monday

to Sunday, the segment
on LCD will be displayed.

6. Press the button to exit or if
there is not any input, system will
release any setting after 10 seconds

7. It is possible to set the air conditioner OFF in
every "holiday"

( ex. 9:00, 10:00, 13:00 )

This function is to automatically stop the machine working on some days.

Owner's Manual 29

Operating Instructions

Ventilation setting

1. Press Ventilation button to turn ON/ OFF the
ventilator.

2. In case of operating the ventilator, the
‘Ventilation’ icon will be displayed.

3. When turn off ventilator, the ‘Ventilation’ icon
disappears.

4. Please refer the Ventilation instruction in
function setting menu in order to connect a
ventilator to air conditioner.

In case of not-connected ventilator, this ventilation
function can not be operated.

Incase of there is linkage between ventilator and air conditioner, it is able to control this ventilator.

Operating ventilation Stop ventilation

Aircon

Ventilator

220V data link

B

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B

A

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R

S

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N

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R

Anti-biofilter

Remote

Controller

Air Outlet

Air Outlet

Air Intake

(side, rear)

Connecting Wire

Drain Hose

Connection Pipe

Power Wire

Air
Intake

Rack

Air Filter

30 Ceiling Cassette Air Conditioner

Maintenance and Service

CAUTION Before performing any maintenance, turn off the main power to the system.

Indoor Unit

Outdoor Unit

Maintenance and Service

Grille, Case and Remote Control

❐ Turn the system off before cleanining, To clean, wipe

with a soft, dry cloth. Do not use bleach or abrasives.

Supply power must be disconnected before cleaning
the indoor unit.

NOTICE

Remove the Air filters.

■

Take hold of the tab and pull slightly
forward to remove the filter.

The heat exchanger coils and panel vents of the outdoor unit
should be checked regularly. If clogged with dirt or soot, the
heat exchanger and panel vents may be professionally
steam cleaned.

Dirty or clogged coils will reduce the operating efficiency of the
system and cause higher operating costs.

NOTICE

CAUTION: When the air filter is to

be removed, do not touch the metal
parts of the indoor unit.

It may cause an injury.

Clean dirt from the air filter using a
vacuum cleaner or washing with water.

■

If dirt is conspicuous, wash with a neutral
detergent in lukewarm water.

■

If hot water (50°C or more) is used, it may
be deformed.

After washing with water, dry well
in the shade.

■

Do not expose the air filter to direct
sunlight or heat from a fire when
drying it.

Install the air filter.

1

234

■ Never use any of the followings:

• Water hotter than 40°C.
Could cause deformation and/or
discoloration.

• Volatile substances.
Could damage the
surfaces of the air
conditioner.

Air Filters

The air filters behind the front grille should be
checked and cleaned once every 2 weeks or more
often if neccessary.

Owner's Manual 31

Maintenance and Service

When the air conditioner is not going to be used for a long time.

When air conditioner is not going to be used for a long time.

1. Operate the air conditioner at the following settings for 2 to 3 hours.

• Type of operation: Fan operation mode.(Refer to page 16.)

• This will dry out the internal mechanisms.

2. Turn off the breaker.

CAUTION Turn off the circuit breaker when the air conditioner is not going to be used
for a long time. Dirt may collect and may cause a fire.

Helpful information

The air filters and your electiric bill.
If the air filters become clogged with dust, the cooling capacity will drop, and 6% of the electricity used to
operate the air conditioner will be wasted.

When the air conditioner is to be used again.

1.

Clean the air filter and install it in the indoor unit.
(Refer to page 30 for cleaning it.)

2.

Check that the air inlet and outlet of the indoor/outdoor unit are not blocked.

3.

Check that the ground wire is connected correctly. It may be connect to the indoor unit side.

Do not overcool the room.

This is not good for your health
and wastes electricity.

Keep blinds or curtains
closed.

Do not let direct sunshine enter
the room when the air
conditioner is in operation.

Keep the room temperature
uniform.

Adjust the vertical and
horizontal airflow direction to
ensure a uniform temperature
in the room.

Make sure that the doors
and windows are shut tight.

Avoid opening doors and
windows as much as possible
to keep the cool air in the room.

Clean the air filter regularly.

Blockages in the air filter
reduce the airflow and lower
cooling and dehumidifying
effects. Clean at least once
every two weeks.

Ventilate the room
occasionally.

Since windows are kept closed,
it is a good idea to open them
and ventilate the room now and
then.

Operation Tips

32 Ceiling Cassette Air Conditioner

Check the following points before requesting repairs or service.... If the fault persists, please contact

your dealer or service center.

Troubleshooting Tips! Save time and money!

The air conditioner does not
operate.

The room has a peculiar odor.

It seems that condensation is
leaking from the air
conditioner.

Air conditioner does not
operate for about 3 minutes
when restarted.

Does not cool or heat
effectively.

The air conditioner operation is
noisy.

Remote control display is faint,
or no display at all.

Crack sound is heard.

Filter sign lamp (LED) is ON.

• Have you made a mistake in timer operation?

• Has the fuse blown or has the circuit breaker
been tripped?

• Check that this is not a damp smell exuded by
the walls, carpet, furniture, or cloth items in the
room.

• Condensation occurs when the airflow from the
air conditioner cools the warm room air.

• This is the protector of the mechanism.

• Wait about three minutes and operation will
begin.

• Is the air filter dirty? See air filter cleaning
instructions.

• The room may have been very hot when the
room air conditioner was first turned on. Allow
time for it to cool down.

• Has the temperature been set incorrectly?

• Are the indoor unit's air inlet or outlet vents
obstructed?

• For a noise that sounds like water flowing.

-This is the sound of freon flowing inside the air

conditioner unit.

• For a noise that sounds like the compressed air
releasing into atmosphere.

-This is the sound of the dehumidifying water

being processed inside the air conditioning
unit.

• Are the batteries depleted?

• Are the batteries inserted in the opposite (+)
and (-) directions?

• This sound is generated by the
expansion/constriction of the front panel, etc.
due to changes of temperature.

• Cleaning the filter, press the Timer button and
button of wired remote controller at the same

time for 3 sec.

23~28

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30

17

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-

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Case Explanation See page

Maintenance and Service

Owner's Manual 33

Memo

34 Ceiling Cassette Air Conditioner

Memo

P/No.: MFL42763405 Printed in Korea

After reading this manual, keep it in a place easily accessible to the user for future reference.