Mitsubishi Electric Mr.Slim MSY-A24NA-1 User manual

SPLIT-TYPE AIR CONDITIONERS
INDOOR UNIT
MSY-A24NA-1
English
OPERATING INSTRUCTIONS For user
• To use this unit correctly and safely, be sure to read these operating
instructions before use.

En-1
•OPERATING INSTRUCTIONS •
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, fire, or electric shock.
Make sure the power plug is free of dirt and insert it se-
curely into the outlet.
• A dirty plug may cause fire 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 fire 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 fire.
• After the indoor unit is switched OFF with the remote con-
troller, make sure to turn the breaker OFF or disconnect the
power plug.
Do not expose yourbody directly to coolair for a prolonged
length of time.
• This could be detrimental to your health.
The unit should not be installed, relocated, or repaired
by the user.
• An improperly handled air conditioner may cause fire or
electric shock.
Do not insert your finger, 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.
• 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.
Marks and their meanings
WARNING : Incorrect handling could cause serious hazard, such as
death, serious injury, etc. with a high probability.
CAUTION : Incorrect handling could cause serious hazard depending
on the conditions.
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, fire, 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.
CAUTION
Do not touch the air inlet or the aluminum fins of the
indoor/outdoor unit.
• This may cause injury.
Do not use insecticides or flammable sprays on the unit.
• This may cause a fire or deformation of the unit.
Do not expose pets or houseplants to direct airflow.
• This may cause injury to the pets or plants.
Do not place other electric appliances or furniture under
the indoor/outdoor unit.
• Watermay dripdown fromthe unit,which maycause damage
or malfunction.
Do not leave the unit on a damaged installation stand.
• The unit may fall and cause injury.
Meanings of symbols used in this manual
: Be sure not to do.
: Be sure to follow the instruction.
: Never insert your finger 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 out-
let.
: Be sure to shut off the power.
SAFETY PRECAUTIONS
CONTENTS
■SAFETY PRECAUTIONS 1
■NAME OF EACH PART 3
■PREPARATION BEFORE OPERATION 4
■SELECTING OPERATION MODES 5
■FAN SPEED AND AIRFLOW DIRECTION ADJUSTMENT 6
■ECONO COOL OPERATION 7
■POWERFUL COOL OPERATION 7
■TIMER OPERATION (ON/OFF TIMER) 7
■CLEANING 8
■WHEN YOU THINK THAT TROUBLE HAS OCCURRED 9
■WHEN THEAIR CONDITIONER IS NOT GOING TO BE USED FOR A LONG TIME 10
■INSTALLATION PLACE AND ELECTRICAL WORK 10
■SPECIFICATIONS 10

En-2
CAUTION
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 fire.
Do not charge or disassemble the batteries, and do not
throw them into a fire.
• This may cause the batteries to leak, or cause a fire or explo-
sion.
Do not operate the unit for a long time at high humidity (80%
RH or more), such as with a door or window left open.
• The water condensation in the air conditioner may drip down,
wetting or damaging the furniture.
Do not use the unit for special purposes, such as storing
food, raising animals, growing plants, or preserving preci-
sion devices or art objects.
• Thismaycause deteriorationof quality,or harm toanimals and
plants.
Do not expose combustion appliances to direct airflow.
• This may cause incomplete combustion.
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 fire.
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 over-
heating, leakage, or explosion.
If the battery fluid comes in contact with your skin or clothes,
wash them thoroughly with clean water.
• If the battery fluid 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 oper-
ated 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, per-
form inspection and maintenance in addition to normal
cleaning.
• Dirtor dustin theunit maycreate anunpleasantodor,contribute
togrowth of fungi,such asmold, orclog thedrainpassage, and
cause water to leak from the indoor unit. Consult your dealer
for inspection and maintenance, which require specialized
knowledge and skills.
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, fire, or electric shock.
Provide a dedicated power supply for the air conditioner.
• A non-dedicated power supply may cause overheating or
fire.
Do not install the unit where flammable 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 depend-
ing on the installation location of the air conditioner (such
as highly humid areas).
• Ifthe GroundFault Interrupt(GFI) circuitbreaker isnot 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.
SAFETY PRECAUTIONS
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 flower vase, on it.
• This may cause fire 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.
For installation

En-3
•OPERATING INSTRUCTIONS •
Temperature buttons
Page 5
Off-timer button Page 7
On-timer button Page 7
TIME set buttons Pages 4, 7
Increase time
Decrease time
CLOCK button Page 4
RESET button Page 4
Lid
Slide down to open
WIDE VANE button
Page 6
Display section
Operation indicator
lamp
Remote control
receiving section
Emergency
operation
switch Page 5
Air inlet (back and side)
Piping
Drainage hose
Air outlet
Drain outlet
Remote controller
holder
Signal transmitting
section
Distance of signal :
About 20ft(6 m)
Beep(s) is (are) heard
from the indoor unit when
the signal is received.
Operation display
section
Operation
select button
Page 5
ECONO
COOL
button Page 7
FAN speed
control button
Page 6
VANE
control button
Page 6
• Install the remote control-
ler holder to a place where
the signal can be received
by the indoor unit.
Use the remote controller provided with the unit only.
Do not use other remote controllers.
Horizontal vane
Vertical vane
Air outlet
Air filter
(Catechin air filter) Air inlet
Front panel
Air cleaning filter
(Anti-Allergy Enzyme Filter)
Outdoor unit
NAME OF EACH PART
Indoor unit Remote controller
Appearance of the outdoor unit may differ from some models.
POWERFUL
COOL button
Page 7
ON/OFF
(operate/stop)
button

En-4
• Make sure the polarity of the batteries is correct.
• Do not use manganese batteries. The remote controller could malfunction.
• Do not use rechargeable batteries.
• 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.
Before operation: Insert the power supply plug into the power outlet and/or
turn the breaker on.
Installing the remote controller batteries
PREPARATION BEFORE OPERATION
RESET
CLOCK
1. Remove the front lid
2. Insert AAA
alkaline batteries
3. Install the front lid
• Press RESET and CLOCK gently using a thin stick.
If the RESET button is not pressed, the remote
controller may not operate correctly.
1. Press RESET
2. Press CLOCK
4. Press CLOCK again
3. Press the TIME buttons to set the
time
Each press increases/decreases
time by 1 minute (10 minutes
when pressed longer)
Setting current time
Changing temperature units (°F/°C)
1. Press RESET while
the temperature but-
tons are pressed.
• Press RESET gently using a thin stick.
The preset unit is °F.

En-5
•OPERATING INSTRUCTIONS •
I FEEL mode
The unit selects the operation mode according to the room temperature
when AUTO 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 tem-
perature. In this case, please wait until the room temperature drops to
within 4°F (2°C) of the set temperature.
• Auto Mode is not recommended if this indoor unit is connected to a MXZ
type outdoor unit.
COOL mode
Enjoy cool air at your desired temperature.
Do not operate COOL mode at low outside temperature
(less than 14°F [-10°C]).
Water condensed in the unit may drip and wet or damage furniture, etc.
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.
Operation indicator lamp
Operation indicator lamp
The operation indicator lamp shows the operation state of the unit.
Indication Operation state Room temperature
Theunit is operatingto reachthe set
temperature
About 4°F (2°C) or
more awayfrom set
temperature
The room temperature is approach-
ing the set temperature
About 2 to 4°F (1 to
2°C) from set tem-
perature
Lighted Not lighted
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:
1Press to start the operation.
2Press to select operation mode. Each press
changes mode in the following order:
3Press 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 .
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 repre-
sentative because the setting of the unit needs to be changed.
SELECTING OPERATION MODES
Set temperature : 75°F
(24°C)
Fan speed : Medium
Horizontal vane : Auto
Emergency COOL
Stop
Note:
The first 30 minutes of operation is test run. Temperature
control does not work, and fan speed is set to High.
(I FEEL)
(COOL)
(DRY)
(FAN)

En-6
Press to select fan speed. Each press changes
fan speed in the following order:
• Two short beeps are heard from the indoor unit when set to AUTO.
Press to select airflow direction. Each press
changes airflow direction in the following order:
• Two short beeps are heard from the indoor unit when set to AUTO.
Press to select horizontal airflow direction. Each
press changes airflow direction in the following order:
Vertical airflow direction
(AUTO)
The vane is set to the most efficient airflow direction: horizontal position.
(Manual)
For efficient air conditioning, select upper position for COOL/DRY. During
COOL/DRY, when the vane is set to position (4) or (5), the vane automati-
cally moves to horizontal position after 1 hour to prevent water dripping.
(Swing)
The vane moves up and down intermittently.
(AUTO) (Low) (Med.) (High)
(AUTO) (1) (2) (3) (4) (5) (SWING)
FAN SPEED AND AIRFLOW DIRECTION ADJUSTMENT
( SWING )

En-7
•OPERATING INSTRUCTIONS •
ECONO COOL OPERATION
Press during COOL mode page 5 to start
ECONO COOL operation.
The unit performs swing operation vertically in various cycle according
to the temperature of the unit. Set temperature is set 4°F (2°C) higher
automatically.
Press again to cancel ECONO COOL operation.
• Pressing also cancels ECONO COOL operation.
What is “ECONO COOL”?
Swing air flow (change of air flow) makes you feel cooler than constant air flow.
So, even though the set temperature is automatically set 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)
1Press or during operation to set the timer.
(ON timer) : The unit will turn ON at the set
time.
(OFF timer) : The unit will turn OFF at the set
time.
* or blinks.
* Make sure that the current time is set correctly. Page 4
2Press (Increase) and (Decrease) to set the
time of timer.
Each press increases or decreases the set time by 10 minutes.
Press or again to cancel timer.
Note:
• ON and OFF timers can be used in combination. mark indicates the order
of timer operations.
• If power failure occurs while ON/OFF timer is set, see page 5 “Auto restart
function”
Press during COOL mode page 5 to start
POWERFUL COOL operation.
Fan speed : POWERFUL-high (exclusive speed for POWERFUL
mode)
Horizontal vane : Set position, or downward airflow position during
AUTO setting
• Temperature cannot be set during POWERFUL COOL operation.
Press again to cancel POWERFUL COOL
operation.
• POWERFUL COOL operation is cancelled automatically in 15 min-
utes.
• POWERFUL COOLoperation is cancelled when the following buttons
are pressed:
ON/OFF button, FAN button, ECONO COOL button
POWERFUL COOL OPERATION

En-8
Instructions:
Air cleaning filter
(Anti-Allergy Enzyme Filter)
Back side of air filter
• Clean every 3 months.
• Soak the filter together with its frame in lukewarm water and wash
it.
• Afterwashing, dryit wellinshadeandput itback toits originalposition.
Install all tabs of the air filter.
• Replace it with a new air cleaning filter every year for best perform-
ance.
• Parts Number
MAC-2300FT
CLEANING
• 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.
• Use only diluted mild detergents.
• Do not expose parts to direct sunlight, heat, or flames to dry.
• Do not use water hotter than 120°F (50°C).
Air filter (Catechin air filter)
• Clean every 2 weeks
• Remove dirt by a vacuum cleaner, or wash with water.
• Dry it well in shade before installing it.
What is “Catechin air filter” ?
Catechin is a bioflavonoid that is found in green tea that has both antivi-
ral and antioxidant qualities. In addition to these benefits, Catechin also
offers excellent deodorizing characteristics. Catechin air filter uses this
compound to not only improve air quality but also prevent the spread of
bacteria and viruses in the room.
Note:
• Clean the filters regularly for best performance and to reduce power
consumption.
• Moisture in the air conditioner for a long time contributes to growth of
fungi, such as mold.
To prevent fungi growth, set to the highest temperature in manual
COOL mode, and operate for 3 to 4 hours to dry out the inside of the unit.
Front panel
Do not open the front panel up past the level position.
• The panel may come off in order to prevent it from being dam-
aged.
• The panel may also come off if the upper part of the panel is
pulled down.
If the front panel comes off, attach it as explained
below.
1. Keep the front panel level with one hand, and insert the hinges
one by one with the other hand into the notches at the left,
right, and center of the top of the indoor unit until they click
into place.
2. Close the front panel.
2
1
Do not exceed
Movable
range

En-9
•OPERATING INSTRUCTIONS •
Even if these itemsare checked, when theunit does not recoverfrom the trouble,
stop using the air conditioner and consult your dealer.
Symptom Explanation & Check points
Indoor Unit
The unit cannot be operated. • Is the breaker turned on?
• Is the power supply plug connected?
• Is the ON timer set? Page 7
The unit cannot be operated
for about 3 minutes when
restarted.
• This protects the unit according to instruc-
tions from the microprocessor. Please
wait.
The fan stops during the DRY
operation. • InDRY operation,the unitoperatesusingthe same refrigerant circuit as in COOL opera-
tion. DRY operation time has to be reduced
inorder tolower humiditywithout muchroom
temperature decreasing. So the compres-
sor sometimes stops, and at the same time
the indoor fan stops. This prevents water
condensed on the heat exchanger from
evaporating again.
Mist is discharged from the air
outlet of the indoor unit. • Thecoolair fromthe unitrapidly cools mois- ture in the air inside the room, and it turns
into mist.
The swing operation of the
HORIZONTAL / VERTICAL
VANE is suspended for a
while, then restarted.
• This is for the swing operation of the HORI-
ZONTAL/ VERTICALVANEto beperformed
normally.
The air flow direction changes
during operation.
The direction of the horizontal
vane cannot be adjusted with
the remote controller.
• 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 flow is automatically set to position
(1) to prevent water from condensing and
dripping.
The unit starts operation by
itself when the main power
is turned on, though it isn’t
operated with the remote
controller.
• Thesemodelsare equippedwith anauto re-
startfunction. Whenthemainpoweris turned
off without stopping the unit with the remote
controller and is turned on again, the unit
starts operation automatically in the same
modeas theoneset withthe remotecontrol-
ler just before the shutoff of the main power.
Refer to “Auto restart function” page 5 .
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.
• When the outside temperature is low dur-
ing cooling operation, the fan operates
intermittently to maintain sufficient cooling
capacity.
Water leaks from the outdoor
unit. • During COOL and DRY operations, pipe or pipeconnecting sectionsarecooledandthis
causes water to condense.
Symptom Explanation & Check points
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.
• 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?
Does not cool
The room cannot be cooled
sufficiently. • Is the temperature setting appropriate?
Page 5
• Is the fan setting appropriate? Please
change fan speed to higher setting. Page 6
• Are the filters clean? Page 8
• Isthe fan orheat exchangerof theindoor 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 insufficient cooling effect.
• When the outside temperature is high, the
cooling effect may not be sufficient.
Airflow
The air from the indoor unit
smells strange. • Are the filters clean? Page 8
• Isthe fan orheat exchangerof theindoor unit
clean?
• The unit may suck in an odor adhering to the
wall, carpet, furniture, cloth, etc. and blow it
out with the air.
Sound
Cracking sound is heard. • This sound is generated by the expansion/
contraction of the front panel, etc. due to
change in temperature.
The sound as burbling is
heard. • This sound is heard when the outside air is absorbed from the drain hose by turning on
the range hood or the ventilation fan, making
water flowing in the drain hose to spout out.
Thissoundis alsoheard whenthe outsideair
blows into the drain hose in case the outside
wind is strong.
Mechanical sound is heard
from the indoor unit. • This is the switching sound in turning on/off the fan or the compressor.
The sound of water flowing
is heard. • This is the sound of refrigerant or condensed water flowing in the unit.
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.
• Theremote controlsignalisnotreceived ina roomwherean electronicON/OFF
type fluorescent lamp (inverter-type fluorescent lamp, etc.) is used.
• Operationof the airconditioner interfereswith radioor TVreception.An ampli-
fier may be required for the affected device.
• When an abnormal sound is heard.
WHEN YOU THINK THAT TROUBLE HAS OCCURRED

En-10
Installation place
Avoid installing the air conditioner in the following places.
• Where there is much machine oil.
• Salty places such as the seaside.
• Where sulfide gas is generated such as a hot spring.
• Where oil is splashed or where the area is filled with oily smoke.
• Where there is high-frequency or wireless equipment.
• Where the air from the outdoor unit air outlet is blocked.
• Where the operation sound or air from the outdoor unit does not bother the
house next door.
Electrical work
• Provide an exclusive circuit for the power supply of the air conditioner.
• Be sure to observe the breaker capacity.
If you have any questions, consult your dealer.
Guaranteed operating range
INSTALLATION PLACE AND
ELECTRICAL WORK
SPECIFICATIONS
To prevent the effects
of a fluorescent lamp,
keep as far apart as
possible.
wall, etc.
Inverter-type
fluorescent lamp
Keep a space to
prevent the pic-
ture distortion or
the noise.
3 ft (1m)
or more
Radio
4 in (100 mm)
or more
Well-
ventilated dry
place
8 in (200 mm)
or more
TV
Cordless
phone or
Portable
phone
10 ft (3 m)
or more
3 ft
(1m)
or more
The installation location of the outdoor unit should
be at least 10ft (3 m) away from the antennas for TV
sets, radios, etc. In areas where the reception is weak,
provide greater space between the outdoor unit and
the antenna of the affected device if operation of the air
conditioner interferes with radio or TV reception.
1Set to the highest temperature in manual COOL mode,
and operate for 3 to 4 hours. Page 5
• This dries the inside of the unit.
• Moisture in the air conditioner contributes to favorable conditions for
growth of fungi, such as mold.
2Press to stop the operation.
3Turn off the breaker and/or disconnect the power sup-
ply plug.
4Remove all batteries from the remote controller.
When using the air conditioner again:
1Clean the air filters. Page 8
2Check that the air inlet and outlet of the indoor and
outdoor units are not blocked.
3Check that the ground is connected correctly.
WHEN THE AIR CONDITIONER IS NOT
GOING TO BE USED FOR A LONG TIME
Indoor Outdoor
Cooling
Upper limit 95°F (35°C) DB 115°F (46.1°C) DB
71°F (21.7°C) WB —
Lower limit 67°F (19.4°C) DB 14°F (-10°C) DB
57°F (13.9°C) WB —

HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
SG79Y962H02