Mitsubishi MSY-GL18NA-U1 Owner’s Manual

SPLIT-TYPE AIR CONDITIONERS

INDOOR UNIT

MSY-GL18NA

OPERATING INSTRUCTIONS

• Tousethisunitcorrectlyandsafely,besuretoreadtheseoperatingin­structionsbeforeuse.

MANUAL DE INSTRUCCIONES

• Parautilizar esta unidadde forma correctay segura, leapreviamente
estasinstruccionesdefuncionamiento.

NOTICE D’UTILISATION

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sécurité,veuillezlirecettenoticed’instructionsavantdemettreleclima­tiseursoustension.

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● OPERATING INSTRUCTIONS ●

CONTENTS

■ SAFETY PRECAUTIONS 1

■ NAME OF EACH PART 3

■ PREPARATION BEFORE OPERATION 4

■ SELECTING OPERATION MODES 5

■ FAN SPEED AND AIRFLOW DIRECTION ADJUSTMENT 6

■ SMART SET OPERATION 6

■ ECONO COOL OPERATION 7

■ TIMER OPERATION (ON/OFF TIMER) 7

■ CLEANING 8

■ WHEN YOU THINK THAT TROUBLE HAS OCCURRED 9

■ WHEN THE AIR CONDITIONER IS NOT GOING TO BE USED FOR A LONG TIME 10

■ INSTALLATION PLACE AND ELECTRICAL WORK 10

■ SPECIFICATIONS 10

SAFETY PRECAUTIONS

• Since rotating parts and parts which could cause an electric shock are used
in this product, be sure to read these “Safety Precautions” before use.

• Since the cautionary items shown here are important for safety, be sure to
observe them.

• After reading this manual, keep it together with the installation manual in a
handy place for easy reference.

• Be sure to receive a guarantee card from your dealer and check that the
purchased date and shop name, etc. are entered correctly.

Marks and their meanings

WARNING :

CAUTION :

Incorrect handling could cause serious hazard, such as
death, serious injury, etc. with a high probability.

Incorrect handling could cause serious hazard depending
on the conditions.

WARNING

Do not connect the power cord to an intermediate point,
use an extension cord, or connect multiple devices to a
single AC outlet.

• This may cause overheating, fi re, or electric shock.

Make sure the power plug is free of dirt and insert it se­curely into the outlet.

• A dirty plug may cause fi re or electric shock.

Do not bundle, pull, or modify the power cord, and do not
apply heat or place heavy objects on it.

• This may cause fi re or electric shock.

Do not turn the breaker OFF/ON or disconnect/connect the
power plug during operation.

• This may create sparks, which can cause fi re.

• After the indoor unit is switched OFF with the remote con­troller, make sure to turn the breaker OFF or disconnect the
power plug.

Do not expose your body directly to cool air for a prolonged
length of time.

• This could be detrimental to your health.

The unit should not be installed, relocated, disassembled,
altered, or repaired by the user.

• An improperly handled air conditioner may cause fi re, electric
shock, injury, or water leakage, etc. Consult your dealer.

• If the power supply cord is damaged, it must be replaced
by the manufacturer or its service agent in order to avoid a
hazard.

When installing, relocating, or servicing the unit, make

sure that no substance other than the specifi ed refrigerant

(R410A) enters the refrigerant circuit.

• Any presence of foreign substance such as air can cause
abnormal pressure rise and may result in explosion or in­jury.

• The use of any refrigerant other than that specifi ed for the
system will cause mechanical failure, system malfunction,
or unit breakdown. In the worst case, this could lead to a
serious impediment to securing product safety.

Meanings of symbols used in this manual

: Be sure not to do.

: Be sure to follow the instruction.

: Never insert your fi nger or stick, etc.

:

Never step onto the indoor/outdoor unit and do not put anything on them.

: Danger of electric shock. Be careful.

: Be sure to disconnect the power supply plug from the power outlet.

: Be sure to shut off the power.

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 should be supervised to ensure that they do not
play with the appliance.

Do not insert your fi nger, a stick, or other objects into the

air inlet or outlet.

• This may cause injury, since the fan inside rotates at high
speeds during operation.

In case of an abnormal condition (such as a burning smell),
stop the air conditioner and disconnect the power plug or
turn the breaker OFF.

• A continued operation in the abnormal state may cause a
malfunction, fi re, or electric shock. In this case, consult your
dealer.

When the air conditioner does not cool or heat, there is
a possibility of refrigerant leakage. In this case, consult
your dealer. If a repair involves recharging the unit with
refrigerant, ask the service technician for details.

• The refrigerant used in the air conditioner is safe. Normally,
it does not leak. However, if refrigerant leaks and comes in
contact with a heat source such as a fan heater, kerosene
heater, or cooking stove, it will create a harmful gas.

The user should never attempt to wash the inside of the
indoor unit. Should the inside of the unit require cleaning,
contact your dealer.

• Unsuitable detergent may cause damage to plastic material
inside the unit, which may result in water leakage. Should
detergent come in contact with electrical parts or the motor,
it will result in a malfunction, smoke, or fi re.

En-1

SAFETY PRECAUTIONS

CAUTION

Do not touch the air inlet or the aluminum fi ns of the in-

door/outdoor unit.

• This may cause injury.

Do not use insecticides or fl ammable sprays on the unit.

• This may cause a fi re or deformation of the unit.

Do not expose pets or houseplants to direct airfl ow.

• This may cause injury to the pets or plants.

Do not place other electric appliances or furniture under the
indoor/outdoor unit.

• Water may drip down from the unit, which may cause damage
or malfunction.

Do not leave the unit on a damaged installation stand.

• The unit may fall and cause injury.

Do not step on an unstable bench to operate or clean the
unit.

• This may cause injury if you fall down.

Do not pull the power cord.

• This may cause a portion of the core wire to break, which may
cause overheating or fi re.

Do not charge or disassemble the batteries, and do not

throw them into a fi re.

• This may cause the batteries to leak, or cause a fi re or explo­sion.

Do not operate the unit for more than 4 hours at high hu­midity (80% RH or more) and/or with windows or outside
door left open.

• This may cause the water condensation in the air conditioner,
which may drip down, wetting or damaging the furniture.

• The water condensation in the air conditioner may contribute
to growth of fungi, such as mold.

Do not use the unit for special purposes, such as storing
food, raising animals, growing plants, or preserving preci­sion devices or art objects.

• This may cause deterioration of quality, or harm to animals
and plants.

Do not expose combustion appliances to direct airfl ow.

• This may cause incomplete combustion.

Never put batteries in your mouth for any reason to avoid
accidental ingestion.

• Battery ingestion may cause choking and/or poisoning.

Before cleaning the unit, switch it OFF and disconnect the
power plug or turn the breaker OFF.

• This may cause injury, since the fan inside rotates at high
speeds during operation.

When the unit will be unused for a long time, disconnect the
power plug or turn the breaker OFF.

• The unit may accumulate dirt, which may cause overheating
or fi re.

Replace all batteries of the remote controller with new ones
of the same type.

• Using an old battery together with a new one may cause
overheating, leakage, or explosion.

If the battery fl uid comes in contact with your skin or clothes,

wash them thoroughly with clean water.

• If the battery fl uid comes in contact with your eyes, wash them
thoroughly with clean water and immediately seek medical
attention.

Ensure that the area is well-ventilated when the unit is oper­ated together with a combustion appliance.

• Inadequate ventilation may cause oxygen starvation.

Turn the breaker OFF when you hear thunder and there is a
possibility of a lightning strike.

• The unit may be damaged if lightning strikes.

After the air conditioner is used for several seasons, per­form inspection and maintenance in addition to normal
cleaning.

• Dirt or dust in the unit may create an unpleasant odor, con­tribute to growth of fungi, such as mold, or clog the drain pas­sage, and cause water to leak from the indoor unit. Consult
your dealer for inspection and maintenance, which require
specialized knowledge and skills.

Do not operate switches with wet hands.

• This may cause electric shock.

Do not clean the air conditioner with water or place an object

that contains water, such as a fl ower vase, on it.

• This may cause fi re or electric shock.

Do not step on or place any object on the outdoor unit.

• This may cause injury if you or the object falls down.

IMPORTANT

Dirty fi lters cause condensation in the air conditioner which will con-

tribute to the growth of fungi such as mold. It is therefore recommended

to clean air fi lters every 2 weeks.

For installation

WARNING

Consult your dealer for installing the air conditioner.

• It should not be installed by the user since installation requires
specialized knowledge and skills. An improperly installed air
conditioner may cause water leakage, fi re, or electric shock.

Provide a dedicated power supply for the air conditioner.

• A non-dedicated power supply may cause overheating or
fi re.

Do not install the unit where fl ammable gas could leak.

• If gas leaks and accumulates around the unit, it may cause an
explosion.

Ground the unit correctly.

• Do not connect the ground wire to a gas pipe, water pipe,
lightning rod, or a telephone ground wire. Improper grounding
may cause electric shock.

CAUTION

Install a Ground Fault Interrupt (GFI) circuit breaker depend­ing on the installation location of the air conditioner (such
as highly humid areas).

• If the Ground Fault Interrupt (GFI) breaker is not installed, it
may cause electric shock.

Ensure that the drain water is properly drained.

• If the drain passage is improper, water may drip down from
the indoor/outdoor unit, wetting and damaging the furniture.

In case of an abnormal condition

Immediately stop operating the air conditioner and consult your dealer.

En-2

● OPERATING INSTRUCTIONS ●

Remote controller

holder

• Install the remote control-

ler holder in a place where

the signal can be received

by the indoor unit.

NAME OF EACH PART

Indoor unit Remote controller

Front
panel

Air fi lter
(Nano platinum fi lter)
Air cleaning
fi lter (Anti-Allergy
Enzyme Filter)

Air outlet

Horizontal vane

Outdoor unit

Heat exchanger

Remote control
receiving section

Operation indicator lamp

Emergency operation switch

Air inlet (back and side)

Air inlet

Operation display
section

Battery replacement
indicator Page 4

OFF/ON
(stop/operate)
button
FAN speed
control button

Page 6

Operation
select button

Page 5

ECONO COOL
button Page 7

VANE control
button Page 6

SMART SET
button

Page 6

Signal transmitting
section
Distance of signal :
About 20 ft. (6 m)

Beep(s) is (are) heard
from the indoor unit when
the signal is received.

Temperature buttons

Page 5

Off-timer button Page 7

On-timer button Page 7

WIDE VANE button

TIME set buttons
Increase time
Decrease time

CLOCK button Page 4

RESET button Page 4

Lid
Slide down to open

Page 6

Pages 4, 7

Remote controller
holder

Refrigerant piping

Drainage hose

Air outlet

Drain outlet

Outdoor units may be different in appearance.

• Install the remote control­ler holder in a place where
the signal can be received
by the indoor unit.

Only use the remote controller provided with the unit.
Do not use other remote controllers.
If two or more indoor units are installed in proximity to one another, an indoor
unit that is not intended to be operated may respond to the remote controller.

En-3

PREPARATION BEFORE OPERATION

Before operation: Insert the power supply plug into the power outlet and/or
turn the breaker on.

Installing the remote controller batteries

4.

Press RESET.

1.

Remove the front lid.

• Make sure the polarity of the batteries is correct.

• Do not use manganese batteries and leaking batteries. The remote controller
could malfunction.

• Do not use rechargeable batteries.

• The battery replacement indicator lights up when the battery is running
low. In 7 days after the indicator starts lights up, the remote controller stops
working.

• Replace all batteries with new ones of the same type.

• Batteries can be used for approximately 1 year. However, batteries with
expired shelf lives last shorter.

• Press RESET gently using a thin instrument.

If the RESET button is not pressed, the remote controller may not operate

correctly.

RESET

CLOCK

3.

2.

Insert the negative

pole of AAA
alkaline batteries fi rst.

Install the front lid.

Setting current time

1.

Press CLOCK.

RESET

CLOCK

2.

Press the TIME buttons to set

the time.

3.

Press CLOCK again.

• Press CLOCK gently using a thin instrument.

Each press increases/decreases

the time by 1 minute (10 min­utes when pressed longer).

Changing temperature units (°F→°C)

Unit is preset with °F.

1.

Press RESET while

the temperature but­tons are pressed.

• Press RESET gently using a thin instrument.

• To change temperature unit from °C to °F, press RESET.

En-4

● OPERATING INSTRUCTIONS ●

SELECTING OPERATION MODES

I FEEL mode

The unit selects the operation mode according to the room tem­perature when I FEEL is selected. When the room temperature is
higher than 77°F (25°C), COOL is selected (set temperature: 75°F
[24°C]). When the room temperature is lower than 77°F (25°C),
DRY is selected. However, when operation is stopped and then
started within 2 hours, the mode which has been selected previously
is operated.

Note:

During COOL operation, the set temperature may not be changed when
the room temperature is more than 4°F (2°C) higher than the set tempera­ture. In this case, please wait until the room temperature drops to within
4°F (2°C) of the set temperature.

COOL mode

Enjoy cool air at your desired temperature.

Note:

Do not operate COOL mode at very low outside temperatures (less than
14°F [-10°C]). Water condensed in the unit may drip and wet or damage
furniture, etc.

1

Press

2

Press to select operation mode. Each press

to start the operation.

changes mode in the following order:

(I FEEL ) (COOL) (DRY) (FAN)

3

Press or to set the temperature.
Each press raises or lowers the temperature by 1°F
(1°C).

Press to stop the operation.

• The same setting is selected the next time by simply pressing .

Operation indicator lamp

The operation indicator lamp shows the operation state of the unit.

Indication Operation state Room temperature

The unit is operating to reach the set
temperature

The room temperature is approach­ing the set temperature

About 4°F (2°C) or
more away from set
temperature

About 2 to 4°F (1 to
2°C) from set tem­perature

DRY mode

Dehumidify your room. The room may be cooled slightly.
Temperature cannot be set during DRY mode.

FAN mode

Circulate the air in your room.

Emergency operation

When the remote controller cannot be used...

Emergency operation can be activated by pressing the emergency operation
switch (E.O.SW) on the indoor unit.

Each time the E.O.SW is pressed, the operation changes in
the following order:

Operation indicator lamp

Emergency COOL

Stop

Note:

The fi rst 30 minutes of operation is test run. Temperature
control does not work, and fan speed is set to High.

Set temperature : 75°F (24°C)
Fan speed : Medium
Horizontal vane : Auto

Lighted Not lighted

En-5

Auto restart function

If a power failure occurs or the main power is turned off during operation, “Auto
restart function” automatically starts operation in the same mode as the one
set with the remote controller just before the shutoff of the main power. When
timer is set, timer setting is cancelled and the unit starts operation when power
is resumed.

If you do not want to use this function, please consult the service repre­sentative because the setting of the unit needs to be changed.

FAN SPEED AND

AIRFLOW DIRECTION ADJUSTMENT

Press to select fan speed. Each press changes
fan speed in the following order:

SMART SET OPERATION

1

Press during COOL or ECONO COOL mode to
select SMART SET mode.

(AUTO) (Quiet) (Low) (Med.) (High) (Super High)

• Two short beeps are heard from the indoor unit when set to AUTO.

• Use higher fan speed to cool the room quicker. It is recommended to
lower the fan speed once the room is cool.

• Use lower fan speed for quiet operation.

Press to select airfl ow direction. Each press
changes airfl ow direction in the following order:

(AUTO) (1) (2) (3) (4) (5) (SWING)

• Two short beeps are heard from the indoor unit when set to AUTO.

Press to select horizontal airfl ow direction. Each
press changes airfl ow direction in the following order:

(SWING)

Airflow direction

(AUTO) .........The vane is set to the most effi cient airfl ow direction. :horizontal

position.

(Manual) .......For efficient air conditioning, select the upper position for

COOL/DRY, and the lower position for FAN. If the position (4)
or (5) is selected during COOL/DRY, the vane automatically
moves to the upward position after 0.5 to 1 hour to prevent
any condensation from dripping.

2

Set the temperature, fan speed, and airfl ow direction.

• The same setting is selected from the next time by simply pressing
.

• One setting can be saved.

• Select the appropriate temperature, fan speed, and airflow direction

according to your room.

Press again to cancel SMART SET operation.

• SMART SET operation also is cancelled when the MODE button is

pressed.

SMART SET operation

A simplified set back function enables to recall the preferred (preset) setting with
a single push of the
the previous setting in an instance.

Example of use:

1. Low energy mode
Set the temperature 4°F (2°C) to 6°F (3°C) warmer in COOL mode. This set­ting is suitable for unoccupied room, and while you are sleeping.

2. Saving frequently used settings
Save your preferred setting for COOL/ECONO COOL. This enables you to
select your preferred setting with a single push of the button.

button. Press the button again and you can go back to

(Swing) .........The vane moves up and down intermittently.

En-6

● OPERATING INSTRUCTIONS ●

ECONO COOL OPERATION

Press during COOL mode page 5 to start
ECONO COOL operation.

The unit performs swing operation vertically in various cycles according to the
temperature of airflow. Set temperature is set 4°F (2°C) higher automatically.

Press again to cancel ECONO COOL operation.

• ECONO COOL operation is also cancelled when the VANE button is
pressed.

What is “ECONO COOL”?

Swing airfl ow (change of airfl ow) makes you feel cooler than stationary airfl ow.
So, even though the set temperature is automatically set at 4°F (2°C) higher, it is
possible to perform cooling operation with keeping comfort. As a result, energy can
be saved.

TIMER OPERATION (ON/OFF TIMER)

1

Press or during operation to set the timer.

(ON timer) : The unit turns ON at the set time.

(OFF timer) : The unit turns OFF at the set time.

* or blinks.
* Make sure that the current time is set correctly. Page 4

2

Press (Increase) and (Decrease) to set the
time of timer.

Each press increases or decreases the set time by 10 minutes.

• Set the timer while

3

Press or again to cancel timer.

or is blinking.

Note:

• ON and OFF timers can be set together. mark indicates the order of timer
operations.

• If power failure occurs while ON/OFF timer is set, see page 5 “Auto restart
function”.

En-7

CLEANING

Instructions:

• Switch off the power supply or turn off the breaker before cleaning.

• Be careful not to touch the metal parts with your hands.

• Do not use benzine, thinner, polishing powder, or insecticide.

Air fi lter (Nano platinum fi lter)

• Clean every 2 weeks

• Remove dirt by a vacuum cleaner, or rinse with water.

• After washing with water, dry it well in shade.

What is “Nano platinum fi lter”?

Nano platinum is a ceramic particle that includes a platinum nano­particle. The particles are incorporated into the fi lter material, which
results in providing semi-permanent antibacterial and deodorizing
characteristics for the fi lter. Nano platinum surpasses the catechin
(a biofl avonoid that is found in green tea) in performance. Nano
platinum fi lter uses this compound not only to improve air quality
but also to eliminate bacteria and viruses. This air fi lter has a semi­permanent lasting effect even after washing it with water.

• Use only diluted mild detergents.

• Do not expose parts to direct sunlight, heat, or fi re to dry.

• Do not use water hotter than 120°F (50°C).

Air cleaning fi lter
(Anti-Allergy Enzyme Filter)

Back side of air fi lter

Every 3 months:

• Remove dirt by a vacuum cleaner.

When dirt cannot be removed by vacuum cleaning:

•

Soak the fi lter and its frame in lukewarm water before rinsing it.

•

After washing, dry it well in shade.

Every year:

• Replace it with a new air cleaning fi lter for best performance.

• Parts Number MAC-408FT-E

Front panel

Hinge

Hole

1. Lift the front panel until a “click” is heard.

2. Hold the hinges and pull to remove as shown in the illustration above.

• Wipe with a soft dry cloth or rinse it with water.

• Do not soak it in water for more than two hours.

• Dry it well in shade.

3. Install the front panel by following the removal pro­cedure in reverse. Close the front panel securely
and press the positions indicated by the arrows.

Pull to remove from the air fi lter

Important

• Clean the fi lters regularly for best performance and to

reduce power consumption.

• Dirty fi lters cause condensation in the air conditioner

which will contribute to the growth of fungi such as
mold. It is therefore recommended to clean air fi lters

every 2 weeks.

En-8

● OPERATING INSTRUCTIONS ●

WHEN YOU THINK THAT TROUBLE HAS OCCURRED

Even if these items are checked, when the unit does not recover from the
trouble, stop using the air conditioner and consult your dealer.

Symptom Explanation & Check points

Indoor Unit

The unit cannot be operated.

The horizontal vane does not
move.

The unit cannot be operated
for about 3 minutes when
restarted.

Mist is discharged from the air
outlet of the indoor unit.

The swing operation of the
HORIZONTAL VANE is
suspended for a while, then
restarted.

The airfl ow direction changes
during operation.
The direction of the horizontal
vane cannot be adjusted with
the remote controller.

The unit starts operation by
itself when the main power is
turned on, but hasn’t received
sign from the remote control­ler.

The indoor unit discolors over
time.

Outdoor Unit

The fan of the outdoor unit
does not rotate even though
the compressor is running.
Even if the fan starts to rotate,
it stops soon.

Water leaks from the outdoor
unit.

Remote controller

The display on the remote
controller does not appear or
it is dim. The indoor unit does
not respond to the remote
control signal.

Does not cool

The room cannot be cooled
suffi ciently.

• Is the breaker turned on?

• Is the power supply plug connected?

• Is the ON timer set? Page 7

• Are the horizontal vanes installed cor­rectly?

• Is the fan guard deformed?

• This protects the unit according to instruc­tions from the microprocessor. Please
wait.

• The cool air from the unit rapidly cools mois­ture in the air inside the room, and it turns
into mist.

• This is for the swing operation of the HORI­ZONTAL VANE to be performed normally.

• When the unit is operated in COOL or DRY
mode, if the operation continues with air
blowing down for 0.5 to 1 hour, the direction
of the air fl ow is automatically set to upward
position to prevent water from condensing
and dripping.

• These models are equipped with an auto re­start function. When the main power is turned
off without stopping the unit with the remote
controller and is turned on again, the unit
starts operation automatically in the same
mode as the one set with the remote control­ler just before the shutoff of the main power.
Refer to “Auto restart function” page 5 .

• Although plastic turns yellow due to the infl u­ence of some factors such as ultraviolet light
and temperature, this has no effect on the
product functions.

• When the outside temperature is low dur­ing cooling operation, the fan operates
intermittently to maintain suffi cient cooling
capacity.

• During COOL and DRY operations, pipe or
pipe connecting sections are cooled and this
causes water to condense.

• Are the batteries exhausted? Page 4

• Is the polarity (+, -) of the batteries correct?

Page 4

• Are any buttons on the remote controller of
other electric appliances being pressed?

• Is the temperature setting appropriate?

Page 5

• Is the fan setting appropriate? Please
fan speed to High or Super High.

• Are the fi lters clean? Page 8

• Is the fan or heat exchanger of the indoor
unit clean?

• Are there any obstacles blocking the air inlet
or outlet of the indoor or outdoor unit?

• Is a window or door open?

• When a ventilation fan or a gas cooker is
used in a room, the cooling load increases,
resulting in an insuffi cient cooling effect.

• When the outside temperature is high, the
cooling effect may not be suffi cient.

• It may take a certain time to reach the setting
temperature or may not reach that depend­ing on the size of the room, the ambient
temperature, and the like.

change

Page 6

En-9

Symptom Explanation & Check points

Airfl ow

The air from the indoor unit
smells strange.

Sound

Cracking sound is heard. • This sound is generated by the expansion/

“Burbling” sound is heard. • This sound is heard when the outside air is

Mechanical sound is heard
from the indoor unit.

The sound of water fl owing
is heard.

Hissing sound is sometimes
heard.

In the following cases, stop using the air conditioner and consult your
dealer.

• When water leaks or drips from the indoor unit.

• When the upper operation indicator lamp blinks.

• When the breaker trips frequently.

• The remote control signal is not received in a room where an electronic ON/OFF
type fl uorescent lamp (inverter-type fl uorescent lamp, etc.) is used.

• Operation of the air conditioner interferes with radio or TV reception. An ampli­fi er may be required for the affected device.

• When an abnormal sound is heard.

• When any refrigerant leakage is found.

• Are the fi lters clean? Page 8

• Is the fan or heat exchanger of the indoor unit
clean?

• The unit may suck in an odor adhering to the
wall, carpet, furniture, cloth, etc. and blow it
out with the air.

contraction of the front panel, etc. due to
change in temperature.

absorbed from the drain hose by turning on
the range hood or the ventilation fan, making
water fl owing in the drain hose to spout out.

This sound is also heard when the outside air

blows into the drain hose in case the outside
wind is strong.

• This is the switching sound in turning on/off
the fan or the compressor.

• This is the sound of refrigerant or condensed
water fl owing in the unit.

• This is the sound when the fl ow of refrigerant
inside the unit is changed.