Please read this manual carefully before operating
your set and retain it for future reference.
Original instruction
P/NO : MFL69460003
Ceiling Cassette - 4Way Type Indoor Unit Owner’s Manual
Safety Precautions.................3
Write the model and serial numbers here:
Model #
Serial #
Prior to Operation ..................6
You can find them on a label on the side of each unit.
Dealer's Name
Date Purchased
Operating Instructions...........7
n Staple your receipt to this page in the event you need
it to prove date of purchase or for warranty issues.
Maintenance and Service ......8
Before you Call for Service
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
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.
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
• There is risk of fire or electric
Install the panel and the cover
of control box securely.
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 install a dedicated
circuit and breaker.
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
• Improper wiring or installation
may cause fire or electric shock
• There is risk of fire or electric
Do not modify or extend the
power cable.
Do not install, remove, or reinstall the unit by yourself
Be cautious when unpacking
and installing the product.
• 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.
• 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.
• Sharp edges could cause injury.
Be especially careful of the case
edges and the fins on the
condenser and evaporator.
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.
Owner’s Manual 3
Safety Precautions
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.
n Operation
Take care to ensure that power
cable could not be pulled out or
damaged during operation.
• There is risk of fire or electric
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
• Oxygen deficiency could occur.
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.
Take care to ensure that
nobody could step on or fall
onto the outdoor unit.
• This could result in personal injury
and product damage.
Indoor Unit
Do not place anything on the
power cable.
• There is risk of fire or electric
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 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
• There is risk of fire or failure of
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
• 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.)
• There is risk of physical injury,
electric shock, or product failure.
Ventilate the product from time
to time when operating it
together with a stove, etc.
• There is risk of fire or electric
When the product is soaked
(flooded or submerged),
contact an Authorized Service
• There is risk of fire or electric
Turn the main power off when
cleaning or maintaining the
• There is risk of 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.
Do not turn on the breaker or power
under condition that front panel,
cabinet, top cover, control box
cover are removed or opened.
• Moisture may condense and wet
or damage furniture.
• Otherwise, it may cause fire, electric shock, explosion or death.
Always check for gas (refrigerant) leakage
after installation or repair of product.
• Low refrigerant levels may
cause failure of product.
n Installation
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
Use two or more people to lift and transport the product.
• Avoid personal injury.
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.
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.
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 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.
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.
Use a firm stool or ladder when cleaning or maintaining the product.
• Be careful and avoid personal injury.
Owner’s Manual 5
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.
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
Operating Instructions
Operating Instructions
Auto Restart Function
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.
Tips for Filter sign LED
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.
Owner’s Manual 7
Maintenance and Service
Maintenance and Service
CAUTION: Before performing any maintenance, turn off the main power to
the system.
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.
Air Outlet
Wired Remote Controller
Air Filters
The air filters behind the front grille should be checked and
cleaned once every 2 weeks or more often if neccessary.
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
Air Filter
n Never use any of the followings:
• Water hotter than 40 °C.
Could cause deformation and/or
• Volatile substances.
Could damage the
surfaces of the air
B en
Indoor Unit
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
4. Install the air filter.
Maintenance and Service
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.
Clean the air filter and install it in the
indoor unit.
(Refer to page 10 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 connect
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.
Since windows are kept
closed, it is a good idea to
open them and ventilate the
room now and then.
Owner’s Manual 9
When the air conditioner is not going to be used for a long time.
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 persist,
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.
Indoor Unit
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