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CEILING CONCEALED DUCT
Original instruction
OWNER’S MANUAL
AIR
CONDITIONER
Copyright © 2017 - 2019 LG Electronics Inc. All Rights Reserved.
MFL68821806
Rev.02_073119
ENGLISH FRANÇAIS
Table of contents
TABLE OF CONTENTS
3 SAFETY PRECAUTIONS
9 PRIOR TO OPERATION
9 Preparing for operation
9 Usage
9 Cleaning and maintenance
9 Service
10 MAINTENANCE AND SERVICE
11 When the air conditioner is not going to be used for a long time.
11 Operation Tips
12 Before you call for service...
2 Indoor Unit
Safety Precautions
Safety Precautions
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.
ENGLISH
!
WARNING
!
CAUTION
n Meanings of symbols used in this manual are as shown below.
Installation
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage to properties only.
Be sure not to do.
Be sure to follow the instruction.
!
WARNING
• Install the panel and the cover of
control box securely.
• Do not use a defective or
underrated circuit breaker. Use this
- There is risk of fire or electric
shock.
appliance on a dedicated circuit.
- There is risk of fire or electric
shock.
• Always install a dedicated circuit
and breaker.
- Improper wiring or installation
• For electrical work, contact the
may cause fire or electric shock.
dealer, seller, a qualified
electrician, or an Authorized
Service Center.
- Do not disassemble or repair the
product. There is risk of fire or
• Use the correctly rated breaker or
fuse.
- There is risk of fire or electric
shock.
electric shock.
• Do not modify or extend the power
• Always ground the product.
- There is risk of fire or electric
shock.
cable.
- There is risk of fire or electric
shock.
Owner’s Manual 3
Safety Precautions
• 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 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.
• 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.
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.
- 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.
• 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.
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 smell or
smoke comes from product. Turn
the breaker off or disconnect the
power supply cable.
- There is risk of electric shock or
fire.
Safety Precautions
• 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.
ENGLISH
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.
!
CAUTION
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.
• 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.
• Take care to ensure that nobody
could step on or fall onto the
outdoor unit.
- This could result in personal
injury and product damage.
• 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.
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 Indoor Unit
• 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 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.
ENGLISH
• 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 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.
Owner’s Manual 7
Safety Precautions
• If you eat the liquid from the
batteries, brush your teeth and see
doctor. Do not use the remote if
the batteries have leaked.
- The chemicals in batteries could
cause burns or other health
hazards.
• This appliance is not intended for
use by persons (including children)
with reduced physical, sensory or
mental capabilities, or lack of
experience and knowledge unless
they have been given supervision
or instruction concerning use of
the appliance by a person
responsible for their safety.
Children be supervised to ensure
that they do not play with the
appliance.
8 Indoor Unit
Prior to operation
ENGLISH
Prior to Operation
Preparing for operation
1. Contact an installation specialist for installation.
2. Use a dedicated circuit.
Usage
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.
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.
Service
1. For repair and maintenance, contact your authorized service dealer.
2. If anyone other than a licensed Professional installs, repairs, or alters LG Electronics Air
Conditioning Products, the warranty is voided. All costs associated with repair are then the full
responsibility of the owner.
Owner’s Manual 9
Maintenance and Service
Air filters
Air outlet vents
Air filters
Air outlet vents
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Maintenance and Service
!
CAUTION
Before performing any maintenance, turn off the main power to the system.
Grille, Case, and Remote Controller
o Turn the system off before cleaning. To clean, wipe with
a soft, dry cloth. Do not use bleach or abrasives.
NOTICE
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.
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.
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.
10 Indoor Unit
Maintenance and Service
ENGLISH
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.
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.
!
CAUTION
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.
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
closed.
When the air conditioner is used again.
Clean the air filter and install it in the
indoor unit.
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
connected to the indoor unit side.
Keep the room temperature
uniform.
This is not good for the health
and wastes electricity.
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.
Do not let direct sunshine
enter the room when the air
conditioner is in operation.
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.
Adjust the vertical and
horizontal airflow direction to
ensure a uniform temperature
in the room.
Ventilate the room
occasionally.
Since windows are kept
closed, it is a good idea to
open them and ventilate the
room now and then.
Owner’s Manual 11
Maintenance and Service
?
Before you call for service...
The air conditioner
does not operate.
• Have you made a
mistake in timer
operation?
• Has the fuse blown
or has the circuit
breaker been
tripped?
Does not cool or heat
• 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?
Troubleshooting Tips! Save time and money!
Check the following points before requesting repairs or service.... If the malfunction persists,
please contact your dealer.
effectively.
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 room.
The air conditioner
operation is noisy.
• 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.
It seems that
condensation is
leaking from the air
conditioner.
• Condensation occurs
when the airflow from
the air conditioner
cools the warm room
air.
Crack sound is
heard.
• This sound is
generated by the
expansion/ constriction
of the front panel, etc.
due to changes of
temperature.
Air conditioner does
not operate for about
3 minutes when
restart.
• This is the protector
of the mechanism.
• Wait about three
minutes and
operation will begin.
Remote control
display is faint, or no
display at all.
• Are the batteries
depleted?
• Are the batteries
inserted in the
opposite (+) and (-)
directions?
NOTICE
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.
12 Indoor Unit
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