Please read this manual carefully before operating your set and retain it for future
Ceiling Concealed Duct- High Static
P/NO : MFL42803016
Ceiling Concealed Duct – High Static Type Indoor Unit Owner’s Manual
Safety Precautions.................3
Write the model and serial numbers here:
Model #
Prior to Operation ..................6
Maintenance and Service ......7
Before you Call for
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
to prove date of purchase or to issue warranty.
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.
• 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.
Indoor Unit
Safety Precautions
Safety Precautions
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.
n Installation
Do not use a defective or
underrated circuit breaker. Use
this appliance on a dedicated
For electrical work, contact the
dealer, seller, a qualified
electrician, or an Authorized
Service Center.
Always ground the product.
• There is risk of fire or electric shock.
• Do not disassemble or repair the
product. There is risk of fire or
electric shock.
• There is risk of fire or electric shock.
Install the panel and the cover
of control box securely.
Always install a dedicated
circuit and breaker.
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.
For installation, always contact the
dealer or an Authorized Service Center.
• There is risk of fire, electric shock,
explosion, or injury.
• Improper wiring or installation may
cause fire or electric shock
• There is risk of fire or electric shock.
Do not install, remove, or reinstall the unit by yourself
Be cautious when unpacking
and installing the product.
• There is risk of fire, electric shock,
explosion, or injury.
• Sharp edges could cause injury. Be
especially careful of the case edges and
the fins on the condenser and evaporator.
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.
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.
Owner’s Manual 3
To prevent injury to the user or other people and property damage, the following instructions must be
n Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified
by the following indications.
Safety Precautions
n Operation
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.
Take care to ensure that power
cable could not be pulled out or
damaged during operation.
Do not place anything on the
power cable.
• Moisture may condense and wet or
damage furniture.
• There is risk of fire or electric shock.
• There is risk of fire or electric shock.
Do not touch(operate) the
product with wet hands.
• There is risk of fire or electrical
Do not store or use flammable gas
or combustibles near the product.
• There is risk of fire or failure of
Do not place a heater or other
appliances near the power
• There is risk of fire and electric
Do not use the product in a tightly
closed space for a long time.
• Oxygen deficiency could occur.
Do not allow water to run into
electric parts.
• It may cause There is risk of fire,
failure of the product, or electric
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.
Stop operation and close the window in
storm or hurricane. If possible, remove
the product from the window before the
hurricane arrives.
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 electric shock or fire.
• There is risk of property damage,
failure of product, or electric shock.
• There is risk of physical injury,
electric shock, or product failure.
When the product is soaked
(flooded or submerged),
contact an Authorized Service
Be cautious that water could
not enter the product.
• There is risk of fire or electric shock.
• 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.
Indoor Unit
Ventilate the product from time
to time when operating it
together with a stove, etc.
• There is risk of fire or 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.
Safety Precautions
n Installation
• Low refrigerant levels may cause
failure of product.
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
Install the drain hose to ensure
that water is drained away
• A bad connection may cause water
Use two or more people to lift and
transport the product.
• Avoid personal injury.
Keep level even when installing
the product.
• To avoid vibration or water leakage.
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.
n 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.
Do not block the inlet or outlet
of air flow.
• It may cause product failure.
Do not step on or put anyting
on the product. (outdoor units)
• There is risk of personal injury and
failure of product.
Do not drink the water drained
from the product.
• It is not sanitary and could cause
serious health issues.
Do not recharge or
disassemble the batteries. Do
not dispose of batteries in a
• They may burn or explode.
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.
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.
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.
Use a firm stool or ladder when
cleaning or maintaining the
• Be careful and avoid personal injury.
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.
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 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.
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
If you eat the liquid from the batteries,
brush your teeth and see doctor. Do not
use the remote if the batteries have
• The chemicals in batteries could cause burns or
other health hazards.
Owner’s Manual 5
Always check for gas (refrigerant)
leakage after installation or repair
of product.
Prior to operation
Prior to Operation
Preparing for 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.
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.
Indoor Unit
Maintenance and Service
Maintenance and Service
Grille, Case, and Remote Controller
❏ Turn the system off before cleaning. To clean, wipe with
a soft, dry cloth. Do not use bleach or abrasives.
Power supply must be disconnected before
cleaning the indoor unit.
Air Filters
The air filters behind the front grille should be checked and
cleaned once every 2 weeks or more often if neccessary.
Air outlet vent
Air filters
1. Remove the Air filters.
■ 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.
■ Never use any of the followings:
• Water hotter than 104 °F(40 °C).
Could cause deformation
and/or discoloration.
• Volatile substances.
Could damage the
surfaces of the air
B en
z ene
2. 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 (122 °F(50 °C) or more) is used,
it may be deformed.
3. 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.
4. Install the air filter.
Owner’s Manual 7
CAUTION: Before performing any maintenance, turn off the main power to
the system.
Maintenance and Service
When the air conditioner is not going to be used for a long time.
When it is not going to be used for
a long time.
When the air conditioner is 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.
Clean the air filter and install it in the
indoor unit.
(Refer to page 7 for cleaning it.)
Check that the air inlet and outlet of the
indoor/outdoor unit are not blocked.
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.
Check that the ground wire is
connected correctly. It may be
connected to the indoor unit side.
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.
Operation Tips
Do not overcool the room.
Keep blinds or curtains
Keep the room temperature
This is not good for the health
and wastes electricity.
Do not let direct sunshine
enter the room when the air
conditioner is in operation.
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.
Clean the air filter regularly.
Ventilate the room
Avoid opening doors and
windows as much as possible
to keep the cool air in the
Blockages in the air filter
reduce the airflow and lower
cooling and dehumidifying
effects. Clean at least once
every two weeks.
Indoor Unit
Since windows are kept
closed, it is a good idea to
open them and ventilate the
room now and then.
Maintenance and Service
Before you call for service...
Troubleshooting Tips! Save time and money!
Check the following points before requesting repairs or service.... If the malfunction persists,
please contact your dealer.
The air conditioner
does not operate.
The room has a
peculiar odor.
It seems that
condensation is
leaking from the air
Air conditioner does
not operate for about
3 minutes when
• 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
• This is the protector
of the mechanism.
• Wait about three
minutes and
operation will begin.
Does not cool or heat
The air conditioner
operation is noisy.
Crack sound is
• Is the air filter dirty?
See air filter cleaning
• 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
• For a noise that
sounds like water
-This is the sound of
freon flowing inside
the air conditioner
• For a noise that
sounds like the
compressed air
releasing into
-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
• Have you made a
mistake in timer
• Has the fuse blown
or has the circuit
breaker been
Remote control
display is faint, or no
display at all.
• Are the batteries
• Are the batteries
inserted in the
opposite (+) and (-)
directions? Filter sign lamp
(LED) is ON.
• Cleaning the filter,
press the Timer button
and ◀ button of wired
remote controller at
the same time for 3
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.
Owner’s Manual 9
Indoor Unit
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.
Service call Number # : (888) LG Canada, (888) 542-2623
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