Ceiling Cassette
Air Conditioner
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.
• 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.
Ceiling Cassette Air Conditioner Owner’s Manual
Safety Precautions.........................3
Write the model and serial numbers here:
Model #
Prior to Operation ..........................8
Serial #
You can find them on a label on the side of each unit.
Dealer's Name
Introduction ....................................9
Date Purchased
Staple your receipt to this page in the event you need
it to prove date of purchase or for warranty issues.
Electrical Safety ...........................10
Operating Instructions.................13
Maintenance and Service ............33
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
for service at all.
first, you may not need to call
• 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.
2 Ceiling Cassette Air Conditioner
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.
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage.
Meanings of symbols used in this manual are as shown below.
Be sure not to do.
Be sure to follow the instruction.
n Installation
Do not use a defective or
underrated circuit breaker.
Use this appliance on a
dedicated circuit.
• There is risk of fire or electric
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.
Install the panel and the
cover of control box
Always install a dedicated
circuit and breaker.
• There is risk of fire or electric
• Improper wiring or installation
may cause fire or electric shock
Always ground the product.
• There is risk of fire or electric
Use the correctly rated
breaker or fuse.
• There is risk of fire or electric
Owner's Manual 3
Safety Precautions
Do not modify or extend the
power cable.
• There is risk of fire or electric
For installation, always contact the
dealer or an Authorized Service Center.
• There is risk of fire, electric
shock, explosion, or injury.
Do not install, remove, or
re-install the unit by yourself
• 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 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.
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
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 plug or unplug the
power supply plug during
• There is risk of fire or electric
Take care to ensure that power
cable could not be pulled out or
damaged during operation.
Do not place anything on
the power cable.
• There is risk of fire or electric
• There is risk of fire or electric
Do not touch(operate) the
product with wet hands.
Do not place a heater or
other appliances near the
power cable.
• There is risk of fire or electrical
• There is risk of fire and electric
4 Ceiling Cassette Air Conditioner
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
Do not store or use flammable
gas or combustibles near the
• There is risk of fire or failure of
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.
If strange sounds, or small or
smoke comes from product. Turn
the breaker off or disconnect the
power supply cable.
• Do not use the telephone or turn
switches on or off.
There is risk of explosion or fire
• There is risk of electric shock or
Do not open the inlet grill of the
product during operation.
(Do not touch the electrostatic
filter, if the unit is so equipped.)
When the product is soaked
(flooded or submerged),
contact an Authorized
Service Center.
• There is risk of physical injury,
electric shock, or product failure.
• There is risk of fire or electric
Ventilate the product from time to time when
operating it together with a stove, etc.
• There is risk of fire or electric shock.
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.
Be cautious that water could
not enter the product.
• There is risk of fire, electric shock,
or product damage.
Turn the main power off when cleaning or
maintaining the product.
• There is risk of electric shock.
Owner's Manual 5
Safety Precautions
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
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
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
Use two or more people to
lift and transport the
• 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.
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.
6 Ceiling Cassette Air Conditioner
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.
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.
x i r
Wa Thnne
Do not step on or put
anyting on the product.
(outdoor units)
Always insert the filter securely.
Clean the filter every two weeks
or more often if necessary.
Do not insert hands or other
objects through the air inlet or
outlet while the product is operated.
• There is risk of personal injury
and failure of product.
• A dirty filter reduces the efficiency
of the air conditioner and could
cause product malfunction or
• 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.
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.
• Be careful and avoid personal
• 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.
Owner's Manual 7
Prior to Operation
Prior to Operation
Preparing for 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
Cleaning and maintenance
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.
8 Ceiling Cassette Air Conditioner
Symbols used in this Manual
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.
WARNING: This appliance should be installed in accordance with national wiring
regulations. This guide acts as a guide to help to explain product features.
Air Outlet
Air Inlet
Owner's Manual 9
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.
Preferred method
Ensure proper ground
exists before use
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.
10 Ceiling Cassette Air Conditioner
Operating Instructions
Operating Instructions
Indoor Unit, Outdoor Unit
Air Outlet
Air Inlet
Wired Remote
Controller (Optional)
Wireless Remote Controller
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)
: 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.
: Lights up during system operation.
Outdoor Unit
Air Intake
(side, rear)
Connecting Wire
Power Wire
Air Outlet
Connection Tube
Drain Hose
Heat pump model: Cassette Type Air Conditioner for cooling and heating
Cooling model: Cassette Type Air Conditioner for cooling
Owner's Manual 11
Remote Control Preparation
12 Ceiling Cassette Air Conditioner
Wireless Remote Controller (Standard)
Owner's Manual 13
Operating Instructions
Operation Mode
turn the unit on.
The unit will respond with a beep.
Open the door of the remote controller and press the
operation mode button. Each time the button is pressed, the
operation mode is shifted in the direction of the arrow.
Dehumidification (Heat pump model only)
For cooling or heating operation set the desired indoor
temperature by pressing the ROOM TEMPERATURE
For cooling the temperature can be set within 18°C~30°C and
for heating the temperature range is 16°C~30°C.
To raise the temperature
To lower the temperature
Set the fan speed with the remote controller. You can select the fan speed in four steps-low,
medium, high and CHAOS by pressing the INDOOR FAN SPEED SELECTOR BUTTON.
Each time the button is pressed, the fan speed mode is shifted.
Fan speed is on low.
Fan speed is on medium.
Fan speed is on high.
Natural wind by the CHAOS logic
F or fresher feeling, press the INDOOR F AN S P E E D S E L E CT OR B U T T ON select and set to CHAOS mode.
In this mode, the wind blows like a natural breeze by automatically changing fan speed according to the CHAOS logic.
14 Ceiling Cassette Air Conditioner
Operating Instructions
Healthy Dehumidification Operation
During Healthy Dehumidification Operation
If you select the dehumidification mode on the OPERATION MODE
SELECTION BUTTON, the product starts to run the dehumidification
function. It automatically sets the room temperature and airflow volume to
the best condition for dehumidification, based on the sensed current room
In this case, however, the setting temperature is not displayed on the remote
controller and you are not able to control the room temperature either.
During the healthy dehumidification function, the airflow volume is
automatically set according to the optimization algorithm responding to the
current room temperature status, so that the room condition is kept healthy
and comfortable even in the very humid season.
To run the healthy dehumidification mode follow steps 1, and 2 and 4
(See operation mode)
Auto Operation
In this operation mode the actual setting temperature and the fan speed
are automatically set by the electronic control logic based on the current
room temperature. If you feel hot or cold press the temperature setting
buttons respectively for more cooling or heating effect.
NOTE : You cannot set the actual setting temperature and the indoor fan
speed in this operation mode. But you can use the Chaos swing
in this operation.
If the system is not operating as desired, switch manually to
another mode.
To run the auto operation follow steps 1, and 2. (See operation mode)
Setting the Time operation
‘ Time can be set only when you have pressed the Reset button. If you have just replaced the batteries,
the Reset button should be pressed to reset the time.
Press the Start/Stop button.
‘ Press 2nd F button
and check if 2ndF icon is on.
‘ Press the Time Setting buttons until the
desired time is set.
‘ Press the Timer SET button.
Note: Check the indicator
for A.M. and P.M.
Owner's Manual 15
Operating Instructions
Jet Cool/Heat Operation
Jet cool function can be used to cool the room quickly in hot summer. When this
function is turned on, the air conditioner runs in cooling operation mode with super
high fan speed and 18°C setting temperature for fast and effective cooling.
You can activate this operation by pressing the JET COOL BUTTON.
To change from jet cool mode to high fan speed cooling mode, press the JET COOL BUTTON or
• Jet cool function cannot be activated during heating or auto changeover operations.
• In case of Inverter, Art Cool and Art Cool Wide(non-Deluxe) model, you can use jet heat function by
pressing JET COOL BUTTON for heating operation.
• Art Cool and Art Cool Wide models close the side discharges during jet cool/heat operation, for strong
cooling and heating.
PLASMA Purification Operation (Optional)
Plasma filter is a technology developed by LG to get rid of microscopic
contaminants in the intake air by generating a plasma of high charge electrons.
This plasma kills and destroys the contaminants completely to provide clean and
hygienic air.
Plasma purification can be started by pressing the PLASMA BUTTON on the remote controller.
Repressing it will deactivate the operation.
This feature can be used in any operation mode and any fan speed can be used while
plasma filter is functioning.
16 Ceiling Cassette Air Conditioner
Wide LCD Wired Remote Controller (Optional)
For detail usage refer to wired remote controller manual provided.
Owner's Manual 17
button to turn on
18 Ceiling Cassette Air Conditioner
Operating Instructions
Heating mode (Heat pump model only)
Owner's Manual 19
Operating Instructions
Auto Change Over mode (Heat pump model only)
Please select the code defend on your feeling.
When feeling
When feeling
slightly cold
20 Ceiling Cassette Air Conditioner
When feeling
When feeling
slightly hot
When feeling
Operating Instructions
Fan mode
Owner's Manual 21
Operating Instructions
Temperature setting/ room temperature check
22 Ceiling Cassette Air Conditioner
Operating Instructions
Airflow setting
We can simply adjust the desired airflow rate
Owner's Manual 23
Operating Instructions
Function setting : Filter Sign Clear
24 Ceiling Cassette Air Conditioner
Operating Instructions
Function setting : Elevation grill (Optional)
Owner's Manual 25
Operating Instructions
Function setting : Vane Angle Control
This function is to adjust angle at that airflow is blow out.
26 Ceiling Cassette Air Conditioner
Operating Instructions
Setting Current Time
Owner's Manual 27
Operating Instructions
Programming : Setting Sleep Reservation
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
28 Ceiling Cassette Air Conditioner
Operating Instructions
Programming : Setting ON Reservation
This function is able to turn air conditioner ON after a setting time.
Owner's Manual 29
Operating Instructions
Programming : Setting OFF Reservation
This function is able to turn air conditioner OFF after a setting time.
30 Ceiling Cassette Air Conditioner
Operating Instructions
Programming : Weekly Reservation
The weekly reservation is active after setting current time
Owner's Manual 31
Operating Instructions
Programming : Holiday Reservation
This function is to automatically stop the machine working on some days.
32 Ceiling Cassette Air Conditioner
Maintenance and Service
Maintenance and Service
CAUTION Before performing any maintenance, turn off the main power to the system.
Indoor Unit
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.
Air Outlet
Wired Remote
Controller (Optional)
Air Filters
The air filters behind the front grille should be
checked and cleaned once every 2 weeks or more
often if neccessary.
Wireless Remote
Controller (Standard)
1 Remove the Air filters.
䭨 Take hold of the tab and pull slightly
forward to remove the filter.
CAUTION: When the air filter is to
be removed, do not touch the metal
parts of the indoor unit.
It may cause an injury.
Air Filter
Clean dirt from the air filter using a
vacuum cleaner or washing with water.
Never use any of the followings:
깨 If dirt is conspicuous, wash with a neutral
detergent in lukewarm water.
• Water hotter than 40°C.
외 If hot water (50¡C or more) is used, it may
Could cause deformation and/or
be deformed.
• Volatile substances.
3 After washing with water, dry well
Could damage the
in the shade.
surfaces of the air
Do not expose the air filter to direct
sunlight or heat from a fire when
n zene
drying it.
Install the air filter.
Outdoor Unit
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.
Air Intake
(side, rear)
Air Outlet
Connecting Wire
Power Wire
Connection Pipe
Drain Hose
Dirty or clogged coils will reduce the operating efficiency of the
system and cause higher operating costs.
Owner's Manual 33
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.
• 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 electric 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.
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.
Operation Tips
Do not overcool the room.
Keep blinds or curtains
This is not good for your health
and wastes electricity.
Do not let direct sunshine enter
the room when the air
conditioner is in operation.
Make sure that the doors
and windows are shut tight.
Clean the air filter regularly.
Avoid opening doors and
windows as much as possible
to keep the cool air in the room.
Blockages in the air filter
reduce the airflow and lower
cooling and dehumidifying
effects. Clean at least once
every two weeks.
34 Ceiling Cassette Air Conditioner
Keep the room temperature
Adjust the vertical and
horizontal airflow direction to
ensure a uniform temperature
in the room.
Ventilate the room
Since windows are kept closed,
it is a good idea to open them
and ventilate the room now and
Maintenance and Service
Troubleshooting Tips! Save time and money!
Check the following points before requesting repairs or service.... If the fault persists, please contact
your dealer or service center.
See page
The air conditioner does not
• Have you made a mistake in timer operation?
• Has the fuse blown or has the circuit breaker
been tripped?
The room has a peculiar odor.
• Check that this is not a damp smell exuded by
the walls, carpet, furniture, or cloth items in the
It seems that condensation is
leaking from the air
• Condensation occurs when the airflow from the
air conditioner cools the warm room air.
Air conditioner does not
operate for about 3 minutes
when restarted.
• This is the protector of the mechanism.
Does not cool or heat
• Is the air filter dirty? See air filter cleaning
• Wait about three minutes and operation will
• The room may have been very hot when the
room air conditioner was first turned on. Allow
time for it to cool down.
The air conditioner operation is
• Has the temperature been set incorrectly?
• Are the indoor unit's air inlet or outlet vents
• 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
Remote control display is faint,
or no display at all.
• Are the batteries depleted?
Crack sound is heard.
• This sound is generated by the
expansion/constriction of the front panel, etc.
due to changes of temperature.
Filter sign lamp (LED) is ON.
• Are the batteries inserted in the opposite (+)
and (-) directions?
• Cleaning the filter, press the Timer button and
button of wired remote controller at the same
time for 3 sec.
Owner's Manual 35
P/No. MFL62865701
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