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P/NO : MFL42803014
www.lg.com
OWNER’S MANUAL
AIR CONDITIONER
Please read this manual carefully before operating
your set and retain it for future reference.
TYPE : Ceiling Cassette - 2Way
http://www.lghvac.com
ENGLISH FRANÇAIS
ESPAÑOL
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2 Indoor Unit
Ceiling Cassette - 2Way Type Indoor Unit 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
n 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 ..................6
Operating Instructions...........7
Maintenance and Service ......8
Before you Call for Service
............................................10
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Safety Precautions
Owner’s Manual 3
ENGLISH
To prevent injury to the user or other people and property damage, the following instructions must be
followed.
n Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified
by the following indications.
WARNING
CAUTION
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage to properties only.
n Meanings of symbols used in this manual are as shown below.
Be sure not to do.
Be sure to follow the instruction.
WARNING
n Installation
Safety Precautions
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.
Do not modify or extend the
power cable.
• There is risk of fire or electric
shock.
Do not install, remove, or reinstall 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.
Do not turn on the breaker or
power under condition that
front panel, cabinet, top cover,
control box cover are removed
or opened.
• Otherwise, it may cause fire,
electric shock, explosion or
death.
Page 4
Safety Precautions
4 Indoor Unit
Do not place a heater or other
appliances near the power
cable.
• There is risk of fire and electric
shock.
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.
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 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 turn on the breaker or
power under condition that front
panel, cabinet, top cover, control
box cover are removed or opened.
• Otherwise, it may cause fire,
electric shock, explosion or death.
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.
Do not touch(operate) the
product with wet hands.
• There is risk of fire or electrical
shock.
n Operation
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.
Use a vacuum pump or Inert (nitrogen) gas when
doing leakage test or air purge. Do not compress
air or Oxygen and Do not use Flammable gases.
Otherwise, it may cause fire or explosion.
• There is the risk of death, injury, fire or explosion.
Page 5
Safety Precautions
Owner’s Manual 5
ENGLISH
CAUTION
n Installation
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.
n Operation
Use two or more people to lift and transport the product.
• Avoid personal injury.
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.
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.
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Prior to operation
6 Indoor Unit
Prior to Operation
1. Contact an installation specialist for installation.
2. Use a dedicated circuit.
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.
4. While using the remote control, refer the user manual of that particular remote controller.
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
Page 7
Operating Instructions
Owner’s Manual 7
ENGLISH
Operating Instructions
Forced operation
(Tact switch)
Forced Operation
Auto Restart Function
Tips for Filter sign LED
Operation procedures when the remote control can't be used.
Press the tact switch (Forced operation) for 2 seconds.
If you want to stop operation, press again the tact switch.
In case the power comes on again after power failure on the Forced
Operation mode, the operating conditions are automatically set as
follows:
During Forced Operation, the initial mode continues.
In case the power comes on again after a power failure, Auto Restarting Operation is the function to operate
procedures automatically to the previous operating conditions.
1. Filter sign lamp (LED) is ON.
2. If LED indicating filter sign lamp is ON, clean the filter.
3. After cleaning the filter, press the Timer button and ◀ button of wired remote controller at the same time for
3 sec. Then filter sign LED is OFF.
Heat pump Model
Cooling Model
Room Temp. ≥ set Temp. 4 °F(2 °C)
Room Temp. < set Temp. 4 °F(2 °C)
Operating mode Cooling Cooling Heating
Indoor FAN Speed High set available set available
Setting Temperature 72 °F(22 °C) set available set available
In case of connecting the simple wired remote controller, plasma image is not displayed you press the forced
operation button.
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Maintenance and Service
8 Indoor Unit
Wired Remote Controller
(Accessory)
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Air Outlet
Air Filter
Push Button
Rack
Air Intake
Anti-bacteria filter
Maintenance and Service
Grille, Case, and Remote Control
o Turn the system off before cleaning. To clean, wipe with
a soft, dry cloth. Do not use bleach or abrasives.
Supply power must be disconnected before
cleaning the indoor unit.
1. Remove the Air filters.
n
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.
2. Clean dirt from the air filter using a vacuum
cleaner or washing with water.
n
If dirt is conspicuous, wash with a neutral
detergent in lukewarm water.
n
If hot water (50 °C or more) is used, it may be
deformed.
3. After washing with water, dry well in
the shade.
n
Do not expose the air filter to direct
sunlight or heat from a fire when drying it.
4. Install the air filter.
Air Filters
The air filters behind the front grille should be checked and
cleaned once every 2 weeks or more often if neccessary.
CAUTION: Before performing any maintenance, turn off the main power to
the system.
n 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.
NOTICE
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Maintenance and Service
Owner’s Manual 9
ENGLISH
CAUTION
CAUTION
When the air conditioner is not going to be used for a long time.
Operation Tips
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 it is not going to be used for
a long time.
When the air conditioner is to be used again.
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.
Turn off the breaker.
Turn off the breaker when the air conditioner
is not going to be used for a long time.
Dirt may collect and may cause a fire.
Clean the air filter and install it in the
indoor unit.
(Refer to page 8 for cleaning it.)
Check that the air inlet and outlet of the
indoor/outdoor unit are not blocked.
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 the 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.
Page 10
Before you call for service...
?
Check the following points before requesting repairs or service.... If the malfunction persist,
please contact your dealer.
Troubleshooting Tips! Save time and money!
• 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.
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
restart.
Does not cool or heat
effectively.
The air conditioner
operation is noisy.
Crack sound is
heard.
Remote control
display is faint, or no
display at all.
• 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.
• 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.
• Are the batteries
depleted?
• Are the batteries
inserted in the
opposite (+) and (-)
directions?
WATER RESISTANT: The outdoor side of this appliance is WATER RESISTANT.
The indoor side is not water resistant and should not be exposed to
excess water.
NOTICE
Filter sign lamp
(LED) is ON.
10 Indoor Unit
Maintenance and Service
Page 11
US
1. Please call the installing contractor of your product, as warranty service will be provided by them.
2. If you have service issues that have not been addressed by the contractor, please call 1-888-865-3026.
CANADA Service call Number # : (888) LG Canada, (888) 542-2623
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