Mitsubishi Electric MFZ-KW25VG User manual

FLOOR-TYPE AIR CONDITIONERS
INDOOR UNIT
MFZ-KW25VG MFZ-KW35VG MFZ-KW42VG MFZ-KW50VG MFZ-KW60VG
English
OPERATING INSTRUCTIONS For user
• To use this unit correctly and safely, be sure to read these operating in-
structions before use.

CONTENTS
■SAFETY PRECAUTIONS 1
■NAME OF EACH PART 3
■PREPARATION BEFORE OPERATION 4
■SELECTING OPERATION MODES 5
■FAN SPEED AND AIRFLOW DIRECTION ADJUSTMENT 6
■I-SAVE OPERATION 7
■ECONO COOL OPERATION 7
■TIMER OPERATION (ON/OFF TIMER) 7
■EMERGENCY OPERATION 8
■AUTO RESTART FUNCTION 8
■WEEKLY TIMER OPERATION 9
■CLEANING 10
■WHEN YOU THINK THAT TROUBLE HAS OCCURRED 11
■WHEN THE AIR CONDITIONER IS NOT GOING TO BE USED FOR A LONG TIME 12
■INSTALLATION PLACE AND ELECTRICAL WORK 12
■SPECIFICATIONS 13
• 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 data and shop name, etc. are entered correctly.
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.
Meanings of symbols used in this manual
: Be sure not to do.
: Be sure to follow the instruction.
: Never insert your 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 o󰀨 the power.
: Risk of re.
SAFETY PRECAUTIONS
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, re, 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 re or electric shock.
Do not bundle, pull, damage, or modify the power cord, and
do not apply heat or place heavy objects on it.
• This may cause 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 re.
• 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, disassembled,
altered, or repaired by the user.
• An improperly handled air conditioner may cause 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, orservicing the unit,make sure
that no substance other than the specied refrigerant (R32/
R410A) enters the refrigerant circuit.
• Any presence of foreign substance such as air can cause
abnormalpressureriseandmayresultinexplosionorinjury.
• The use of any refrigerant other than that speci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.
This appliance is not intended for use by persons (includ-
ing children) with reduced physical, sensory or mental ca-
pabilities, or lackof 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.
Meanings of symbols displayed on indoor unit and/or outdoor unit
WARNING
(Risk of re)
This unit uses a ammable refrigerant.
If refrigerant leaks and comes in contact with re or heating part, it will create harmful gas and there is risk of re.
Read the OPERATING INSTRUCTIONS carefully before operation.
Service personnel are required to carefully read the OPERATING INSTRUCTIONS and INSTALLATION MANUAL before operation.
Further information is available in the OPERATING INSTRUCTIONS, INSTALLATION MANUAL, and the like.
● OPERATING INSTRUCTIONS ●
EN-1

SAFETY PRECAUTIONS
Do not turn the breaker OFF except the case of burning
smell, or when performing maintenance or inspection.
• The refrigerant leakage cannot be detected, and this may
cause a re.
Do not install the unit in a place where smoke, gas, or
chemicals may ll.
• Do not use any gas equipment for propane, butane or
methane, sprays such as bug killer, and paint etc., near by
the indoor unit.
• Therefrigerantsensorreactstoitanddisplaysanerror.This
may cause the unit not to operate.
(Procedure in case of refrigerant leakage)
If the refrigerant leaks, extinguish a re such as a heater,
and ventilate the room adequately by opening the window.
• Then contact your dealer.
• The indoor unit spreads the refrigerant by FAN mode to
prevent a re. Do not turn the breaker OFF during this situ-
ation.
Do not insert your 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, 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. If any refrigerant leakage
is found, ventilate the room well and consult your dealer
immediately. Do not turn the breaker OFF. If a repair in-
volves recharging the unit with refrigerant, ask the service
technician for details.
• The refrigerant used in the air conditioner is not harmful.
Normally, it does not leak. However, if refrigerant leaks and
comes in contact with re or heating part of such a fan heater,
kerosene heater, or cooking stove, it will create harmful gas
and there is risk of re.
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 re.
• Theapplianceshallbe stored in a room without continuously
operating ignition sources (for example: open ames, an
operating gas appliance or an operating electric heater).
• Be aware that refrigerants may not contain an odour.
• Do not use means to accelerate the defrosting process or
to clean the appliance, other than those recommended by
the manufacturer.
• Do not pierce or burn.
This unit should be installed in rooms which exceed the
oor space specied in outdoor unit installation manual.
• Refer to outdoor unit installation manual.
This appliance is intended to be used by expert or trained
users in shops, in light industry and on farms, or for com-
mercial use by laypersons.
CAUTION
Do not touch the air inlet or the aluminum ns of the indoor/
outdoor unit.
• This may cause injury.
Do not use insecticides or ammable sprays on the unit.
• This may cause a re or deformation of the unit.
Do not expose pets or houseplants to direct airow.
• This may cause injury to the pets or plants.
Do not place other electric appliances or furniture under
the indoor/outdoor unit.
• Watermay dripdownfrom the unit,whichmay causedamage
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 re.
Do not charge or disassemble the batteries, and do not
throw them into a re.
• This may cause the batteries to leak, or cause a re or
explosion.
Do not operate the unit for more than 4 hours at high hu-
midity (80% RH or more) and/or with windows or outside
door left open.
• Thismay cause the watercondensationinthe air conditioner,
which may drip down, wetting or damaging the furniture.
• Thewater 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 preci-
sion devices or art objects.
• This may cause deterioration of quality, or harm to animals
and plants.
Do not expose combustion appliances to direct air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.
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 uid comes in contact with your skin or
clothes, wash them thoroughly with clean water.
• If the battery 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, per-
form inspection and maintenance in addition to normal
cleaning.
• Dirt or dust in the unit may create an unpleasant odor, con-
tribute 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 ower vase, on it.
• This may cause 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 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 lters every 2 weeks.
EN-2

Outdoor unitIndoor unit
Fan guard
Air cleaning lter
(Anti-Allergy Enzyme lter)
Air lter (Air purifying lter)
Panel
Outdoor units may be di󰀨erent in appearance.
Front panel
Horizontal vane
Vertical vane
Multi-ow vane
Spec name
plate *1
*1 The manufacturing year and month is indicated on the spec name plate.
SAFETY PRECAUTIONS
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, re, or
electric shock.
Provide a dedicated power supply for the air conditioner.
• A non-dedicated power supply may cause overheating or
re.
Do not install the unit where ammable gas could leak.
• Ifgasleaksandaccumulatesaroundthe outdoor unit, it may
cause an explosion.
For installation Earth the unit correctly.
• Do not connect the earth wire to a gas pipe, water pipe,
lightning rod, or a telephone earth wire. Improper earthing
may cause electric shock.
CAUTION
Install an earth leakage breaker depending on the installa-
tion location of the air conditioner (such as highly humid
areas).
• If an earth leakage 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.
NAME OF EACH PART
E.O
SW
Display and operation section
(When the front panel is opened)
Operation indicator lamp
Emergency operation
switch
Remote control receiving section
Air outlet Air inlet (back and side)
Refrigerant piping
Drainage hose
Air outlet
Drain outlet
Spec name plate *1
● OPERATING INSTRUCTIONS ●
EN-3

NAME OF EACH PART PREPARATION BEFORE OPERATION
Remote controller Signal transmitting
section
Distance of signal :
About 6 m
Beep(s) is (are) heard from
the indoor unit when the
signal is received.
Operation
display section
OFF/ON
(stop/operate) button
Temperature
buttons Page 5
Operation
select button
Page 5
ECONO COOL
button Page 7
FAN speed control
button Page 6
VANE control
button Page 6
TIME, TIMER set
buttons Page 4, 7
Increase time
Decrease time
CLOCK button
Page 4
RESET button Page 4
Lid
Slide the lid down
to open the remote
controller. Slide it down
further to get to the
weekly timer buttons.
Only use the remote controller provid-
ed 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.
i-save button
Page 7
WEEKLY TIMER
set buttons Page 9
Remote
controller holder
• Install the remote con-
troller holder in a place
where the signal can be
received by the indoor
unit.
Before operation: Insert the power supply plug into the power outlet and/or
turn the breaker on.
Installing the remote controller batteries
1. Remove the front lid.
2. Insert the negative
pole of AAA
alkaline batteries rst.
3. Install the front lid.
4. Press RESET.
Note:
• 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 about 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 ex-
pired 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.
Setting current time
1. Press CLOCK.
4. Press CLOCK again.
2. Press either the TIME button
or the TIMER buttons to set
the time.
Each press increases/decreas-
es the time by 1 minute (10
minutes when pressed longer).
3. Press the DAY button
to set the day.
Note:
• Press CLOCK gently using a thin instrument.
EN-4

AUTO mode (Auto change over)
The unit selects the operation mode according to the di󰀨erence between the
room temperature and the set temperature. During AUTO mode, the unit
changes mode (COOL↔HEAT) when the room temperature is about 2˚C
away from the set temperature for more than 15 minutes.
COOL mode
Enjoy cool air at your desired temperature.
Note:
Do not operate COOL mode at very low outside temperatures (less than
-10°C). Water condensed in the unit may drip and wet or damage furni-
ture, etc.
DRY mode
Dehumidify your room. The room may be cooled slightly.
Temperature cannot be set during DRY mode.
HEAT mode
Enjoy warm air at your desired temperature.
FAN mode
Circulate the air in your room.
Temperature cannot be set during FAN mode.
Note:
After COOL/DRY mode operation, it is recommended to operate in the
FAN mode to dry inside the indoor unit.
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°C.
Press to stop the operation.
SELECTING OPERATION MODES
(AUTO) (COOL) (DRY) (HEAT) (FAN)
Note:
Operation indicator lamp
The operation indicator lamp shows the operation state of the unit.
Indication Operation state Room temperature
Theunitisoperatingtoreachthe set
temperature About 2°C or more away from set temperature
The room temperature is approach-
ing the set temperature About 1 to 2°C from set temperature
Lit Not lit
EN-5
● OPERATING INSTRUCTIONS ●

FAN SPEED AND AIRFLOW DIRECTION ADJUSTMENT
Press to select vertical airow direction. Each
press will change airow direction in the following
order:
• Two short beeps will be heard from the indoor unit when set to AUTO.
• Moving the horizontal vane/multi-flow vane manually can cause trou-
ble.
• The horizontal vane/multi-flow vane automatically moves in certain in-
tervals to determine its position, and then it returns to the set position.
• When the air outlet is switched between 1 FLOW and 2 FLOW, the
horizontal vanes may move and change their positions.
(AUTO) (1) (2) (3) (4) (SWING)
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.
• Use higher fan speed to cool/heat the room quicker. It is recommend-
ed to lower the fan speed once the room is cool/warm.
• Use lower fan speed for quiet operation.
(AUTO) (Quiet) (Low) (Med.) (High) (Super High)
Press to select the air outlet(s).
When 2 FLOW is selected, air blows from the top and
the front of the unit. When 1 FLOW is selected, air
blows only from the top of the unit.
The multi-flow vane is automatically set to the appropriate position.
Even if 2 FLOW is selected, air will blow only from the top of the unit in
the following conditions:
• During COOL/DRY: The room temperature is close to set temperature.
The air conditioner has operated for 0.5 to 1 hour.
• During HEAT: The air flow temperature is low.
(During defrosting operation, start of operation, etc.)
Note:
Movement at the start of the 2 FLOW operation
• COOL/DRY, HEAT: It takes 0.5 to 1 minute to start the 2 FLOW operation.
• HEAT: When cold air blows out from the air outlet, the multi-ow vane may
stop moving for up to 10 minutes to make and blow out warm air.
Air outlet selection
(2 FLOW)(1 FLOW)
Fan speed
Up-down Airflow direction
Left-right Airflow direction
Airflow direction
(AUTO).......The vane will be set to the most e󰀩cient airow direction.
COOL/DRY/FAN (2 FLOW) : position (2)
COOL/DRY/FAN (1 FLOW) : position (1)
HEAT (2 FLOW) : position (2)
HEAT (1 FLOW) : position (3)
(Manual).....For efficient air conditioning, select upper position for COOL/
DRY, and lower position for HEAT. During COOL/DRY, when
the vane is set to position (3) or (4), the vane automatically
moves to position (1) after 0.5 to 1 hour to prevent water drip-
ping.
(Swing).......The horizontal vane will move up and down intermittently.
■ To change the horizontal airow direction.
Move the vertical vane manually before starting operation.
EN-6

I-SAVE OPERATION ECONO COOL OPERATION
T IMER OPERATION (ON/OFF TIMER)
A simplied set back function enables to recall the preferred (preset) setting with
a single push of the button. Press the button again and you can go back to
the previous setting in an instance.
1Press during COOL, or HEAT mode to select
i-save mode.
2Set the temperature, fan speed, airow direction, and 2
FLOW/1 FLOW.
• The same setting is selected from the next time by simply pressing
.
• Two settings can be saved. (One for COOL, one for HEAT)
• Select the appropriate temperature, fan speed, airflow direction, and 2
FLOW/1 FLOW according to your room.
• Normally, the minimum temperature setting in HEAT mode is 16°C.
However, during i-save operation only, the minimum temperature set-
ting is 10°C.
Press again to cancel i-save operation.
• i-save operation also is cancelled when the MODE button is pressed.
Note:
i-save operation cannot be set on the weekly timer.
Example of use:
1. Low energy mode
Set the temperature 2°C to 3°C warmer in COOL and cooler in HEAT mode.
This setting is suitable for unoccupied room, and while you are sleeping.
2. Saving frequently used settings
Save your preferred setting for COOL and HEAT. This enables you to select
your preferred setting with a single push of the button.
Swing airow (change of air ow) makes you feel cooler than stationary airow.
The set temperature and the airow direction are automatically changed by the
microprocessor.
It is possible to perform cooling operation with keeping comfort.
As a result energy can be saved.
Press during COOL mode page 5 to start
ECONO COOL operation.
The unit performs swing operation vertically in various cycles according to the
temperature airflow.
Press again to cancel ECONO COOL operation.
• ECONO COOL operation is also cancelled when the VANE button is
pressed.
1Press 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 and day are 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.
• Set the timer while or is blinking.
3Press or again to cancel timer.
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 8 “Auto restart
function”.
EN-7
● OPERATING INSTRUCTIONS ●

Operation indicator lamp
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:
Set temperature : 24°C
Fan speed : Medium
Horizontal vane : Auto
Air outlet : 2 FLOW
Emergency COOL
Emergency HEAT
Stop
Note:
• The rst 30 minutes of operation is test run. Temperature
control does not work, and fan speed is set to High. The air
outlet selection is set to 2 FLOW. Page 6
• In the emergency heating operation, the fan speed gradu-
ally rises to blow out warm air.
Emergency
operation
switch
(E.O. SW)
EMERGENCY OPERATION
AUTO RESTART FUNCTION
If a power failure occurs or the main power is turned o󰀨 during operation, “Auto
restart function” automatically starts operation in the same mode as the one set
with the remote controller just before the shuto󰀨 of the main power. When timer is
set,timer setting is cancelledandthe unit starts operationwhenpower 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.
EN-8

• A maximum of 4 ON or OFF timers can be set for individual days of the week.
• A maximum of 28 ON or OFF timers can be set for a week.
Setting the weekly timer
* Make sure that the current time and day are set correctly.
1Press to enter the weekly timer setting mode.
2Press and to select setting day and number.
3Press , , and to set ON/OFF, time, and
temperature.
Press and to continue setting the timer for
other days and/or numbers.
4Press to complete and transmit the weekly timer
setting.
Note:
• Press to transmit the setting information of weekly timer to the indoor
unit. Point the remote controller toward the indoor unit for 3 seconds.
• When setting the timer for more than one day of the week or one number,
does not have to be pressed per each setting. Press once after
all the settings are complete. All the weekly timer settings will be saved.
• Press to enter the weekly timer setting mode, and press and hold
for 5 seconds to erase all weekly timer settings. Point the remote
controller toward the indoor unit.
5Press to turn the weekly timer ON. ( lights.)
* When the weekly timer is ON, the day of the week whose timer setting
is complete, will light.
Press again to turn the weekly timer OFF. (
goes out.)
Note:
The saved settings will not be cleared when the weekly timer is turned OFF.
Checking weekly timer setting
1Press to enter the weekly timer setting mode.
* blinks.
2Press or to view the setting of the particular
day or number.
Press to exit the weekly timer setting.
* which was blink-
ing goes out, and the
current time will be
displayed.
* blinks.
Note:
The simple ON/OFF timer setting is available while the weekly timer is on. In
this case, the ON/OFF timer has priority over the weekly timer; the weekly timer
operation will start again after the simple ON/OFF timer is complete.
E.g. : Runs at 24°C from waking up to leaving home, and runs at 27°C from
getting home to going to bed on weekdays.
Runs at 27°C from waking up late to going bed early on weekends.
Setting1 Setting2 Setting3 Setting4
Setting1 Setting2
6:00 8:30 17:30 22:00
21:00
24°C 27°C
ON OFF ON OFF
ON OFF
Mon
Fri
~
Sat
Sun
~
27°C
Pressing selects the day of
the week to be set. Pressing selects the setting number.
* All days can be selected.
E.g. : [Mon Tue ... Sun]
and [1] are selected.
E.g. : [ON], [6:00]
and [24°C] are
selected.
Pressing
selects ON/OFF timer.
Pressing
deletes timer setting.
Pressing
adjusts the time.
Pressing
adjusts the tem-
perature.
* Hold down the button to change the time quickly.
* The temperature can be set between 16°C and 31°C at weekly timer.
WEEKLY TIMER OPERATION
8:00
EN-9
● OPERATING INSTRUCTIONS ●

CLEANING
Front panel
1. Push down the tab on the both sides of the unit to open the front panel.
2. Pull the front panel toward you to remove it.
3. Open the front panel completely and then remove it.
• Wipe with a soft dry cloth or wash it with water.
• Do not soak it in water for more than two hours.
• Dry it well in shade before installing it.
4. Install the front panel by following the removal procedure in reverse.
Air cleaning lter
(Anti-Allergy Enzyme lter)
Back side of air lter
Clean every 3 months:
• Remove dirt by a vacuum cleaner.
When dirt cannot be removed by
vacuum cleaning:
• Soak the lter and its frame in lukewarm water
before rinsing it.
(Diluted mild detergents can be used when
dirt cannot be removed.)
• After washing, dry it well in shade.
Every year:
• Replace it with a new air cleaning lter for best
performance.
• Parts Number MAC-408FT-E
Air lter (Air purifying lter)
• Clean every 2 weeks
• Remove dirt by a vacuum cleaner, or rinse with water.
• After washing with water, dry it well in shade.
Important
• Clean the lters regularly for best performance and to re-
duce power consumption.
• Dirty 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 lters every 2 weeks.
Instructions:
• Switch o󰀨 the power supply or turn o󰀨 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 neutral detergents.
• Do not expose parts to direct sunlight, heat, or ames to dry.
• Do not use water hotter than 50°C.
• Do not use a scrubbing brush, a hard sponge, or the like.
• Do not soak or rinse the horizontal vane.
EN-10

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. • Is the breaker turned on?
• Is the power supply plug connected?
• Is the ON timer set?
The unit cannot be operated for
about 3 minutes when restarted. • This protects the unit according to instructions from the microprocessor. Please wait.
Mist is discharged from the air
outlet of the indoor unit. • The cool air from the unit rapidly cools moisture in the air inside the room, and it turns into mist.
The swing operation of the
HORIZONTAL VANE is
suspended for a while, then
restarted.
• Thisis forthe swing operation of theHORIZON-
TAL VANE to be performed normally.
The air ow direction changes
during operation.
The direction of the horizontal
vane/multi-ow vane cannot
be adjusted with the remote
controller.
• In the heating operation, if the air ow tem-
perature is too low or when defrosting is being
done, the horizontal vane is automatically set
to vertical position. The multi-ow vane is set to
the closed position.
• When the air conditioner is operated in COOL
orDRY mode, if the operationcontinues with air
blowing horizontally for 1 hour, the direction of
the air ow is automatically set to position (1)
toprevent condensedwater from dropping.The
multi-ow vane is set to the closed position.
• The horizontal vane and the multi-ow vane
automatically moves in certain intervals to
determine its position, and then it returns to the
set position.
The operation is stopped for
about 10 minutes in the heating
operation.
• Defrosting of the outdoor unit is being done.
Since this is completed in max.10 minutes,
please wait. (When the outside temperature is
toolow andhumidity istoo high, frost is formed.)
The unit starts operation by
itself when the main power is
turned on, though it isn’t oper-
ated with the remote controller.
• These models are equipped with an auto
restart function. When the main power is
turned o󰀨 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 control-
ler just before the shuto󰀨 of the main power.
Refer to “Auto restart function”. Page 8
The multi-ow vane opens and
closes automatically. • The multi-ow vane is automatically controlled by a microcomputer according to the air ow
temperature and operation time of the air con-
ditioner.
The indoor unit which is not
operating becomes warm and a
sound, similar to water owing,
is heard from the unit.
• A small amount of refrigerant continues to ow
into the indoor unit even though it is not operat-
ing.
The indoor unit discolors over
time. • Although plastic turns yellow due to the inuence of some factors such as ultraviolet light and
temperature, this has no e󰀨ect on the product
functions.
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
• Areany buttonson theremote controllerof other
electric appliances being pressed?
WHEN YOU THINK THAT TROUBLE HAS OCCURRED
Symptom Explanation & Check points
Does not cool or heat
The room cannot be cooled or
heated su󰀩ciently. • Is the temperature setting appropriate?
Page 5
• Is the fan setting appropriate? Please change
fan speed to High or Super High. Page 6
• Is the air outlet selection is set to 1 FLOW? Set
it to 2 FLOW. Page 6
• Is the lter clean? Page 10
• 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?
• It may take a certain time to reach the setting
temperatureor maynot reachthat dependingon
the size of the room, the ambient temperature,
and the like.
The room cannot be cooled
su󰀩ciently. • When a ventilation fan or a gas cooker is used in a room, the cooling load increases, resulting
in an insu󰀩cient cooling e󰀨ect.
• When the outside temperature is high, the
cooling e󰀨ect may not be su󰀩cient.
The room cannot be heated
su󰀩ciently. • When the outside temperature is low, the heat- ing e󰀨ect may not be su󰀩cient.
Air does not blow out soon in
the heating operation. • Please wait as the unit is preparing to blow out warm air.
Airow
The air from the indoor unit
smells strange. • Is the lter clean? Page 10
• 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.
Sound
Cracking sound is heard. • This sound is generated by the expansion/
contraction of the 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
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.
Mechanical sound is heard from
the indoor unit. • This is the switching sound in turning on/o󰀨 the fan or the compressor.
The sound of water owing is
heard. • This is the sound of refrigerant or condensed water owing in the unit.
Hissing sound is sometimes
heard. • This is the sound when the ow of refrigerant inside the unit is switched.
The sound of motor and swirling
sound is heard from the indoor
unit.
• This is the sound of water condensed during
COOL/DRY operation being drained from the
indoor unit.
• Soundof waterdraining mayalso beheard from
indoorunits which are not operating.(The sound
will stop automatically. Please wait.)
Timer
Weekly timer does not operate
according to settings. • Is the ON/OFF timer set? Page 7
• Transmit the setting information of the weekly
timerto theindoor unitagain. Whenthe informa-
tion is successfully received, a long beep will
soundfrom the indoorunit. If informationfails to
bereceived, 3short beepswill beheard. Ensure
information is successfully received. Page 9
• When a power failure occurs and the main
power turns o󰀨, the indoor unit built-in clock will
be incorrect. As a result, the weekly timer may
not work normally.
Be sure to place the remote controller where
the signal can be received by the indoor unit.
Page 4
The unit starts/stops the opera-
tion by itself. • Is the weekly timer set? Page 9
EN-11
● OPERATING INSTRUCTIONS ●

In the following cases, stop using the air conditioner and consult your dealer.
• When water leaks or drips from the indoor unit.
• When the left 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 uorescent lamp (inverter-type uorescent lamp, etc.) is used.
• Operation of the air conditioner interferes with radio or TV reception. An amplier may be required for the a󰀨ected device.
• When an abnormal sound is heard.
• When any refrigerant leakage is found.
WHEN YOU THINK THAT TROUBLE HAS OCCURRED
INSTALLATION PLACE AND
ELECTRICAL WORK
WHEN THE AIR CONDITIONER IS NOT
GOING TO BE USED FOR A LONG TIME
Installation place
Avoid installing the air conditioner in the following places.
• Where there is much machine oil.
• Salty places such as the seaside.
• Where sulde gas is generated such as hot spring, sewage, waste water.
• Where oil is splashed or where the area is lled with oily smoke (such as cook-
ing areas and factories, in which the properties of plastic could be changed
and damaged).
• Where there is high-frequency or wireless equipment.
• Where the air from the outdoor unit air outlet is blocked.
• Wheretheoperation sound or air from the outdoor unit bothers the house next
door.
• Do not install the indoor unit at a place higher than 150 mm.
• Do not operate the air conditioner during interior construction and nishing
work, or while waxing the oor. Before operating the air conditioner, ventilate
the room well after such work is performed. Otherwise, it may cause volatile
elements to adhere inside the air conditioner, resulting in water leakage or
scattering of dew.
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.
wall, etc.
For the optimum e󰀩ciency
and to extend the life time of
using, the outdoor unit should
be installed in a well-ventilated
dry place.
3 m or
more
The installation location of the outdoor unit should be at
least 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 a󰀨ected device if operation of the air conditioner
interferes with radio or TV reception.
100 mm
or more
500 mm
or more
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.
3Do not turn the breaker OFF except the case of burning
smell, or when performing maintenance or inspection.
The refrigerant leakage cannot be detected, and this
may cause a re.
4Remove all batteries from the remote controller.
When using the air conditioner again:
1Clean the air lter. Page 10
2Check that the air inlet and outlet of the indoor and
outdoor units are not blocked.
3Check that the earth is connected correctly.
4Refer to the “PREPARATION BEFORE OPERATION”,
and follow the instructions. Page 4
To prevent the e󰀨ects
of a uorescent lamp,
keep as far apart as
possible.
Inverter-type
uorescent lamp
Keep a space
to prevent the
picture distortion
or the noise.
Radio
TV
Cordless phone
or portable
phone
1 m
or more
1 m
or more
EN-12

SPECIFICATIONS
DB: Dry Bulb
WB: Wet Bulb
Indoor Outdoor
MUFZ-
KW25/35/42/50/60VG MUFZ- KW50/60VGHZ
Cooling Upper limit 32°C DB
23°C WB 46°C DB —46°C DB —
Lower limit 21°C DB
15°C WB -10°C DB —-10°C DB —
Heating Upper limit 27°C DB
—24°C DB 18°C WB 24°C DB 18°C WB
Lower limit 20°C DB
—-15°C DB -16°C WB -25°C DB -26°C WB
Guaranteed operating range
Note:
Rating condition
Cooling —Indoor: 27°C DB, 19°C WB
Outdoor: 35°C DB
Heating —Indoor: 20°C DB
Outdoor: 7°C DB, 6°C WB
Model Indoor MFZ-KW25VG-A1 MFZ-KW35VG-A1 MFZ-KW42VG-A1
Outdoor MUFZ-KW25VG-A1 MUFZ-KW35VG-A1 MUFZ-KW42VG-A1
Function Cooling Heating Cooling Heating Cooling Heating
Power supply ~ /N, 230V, 50Hz
Capacity kW 2.5 3.4 3.5 4.3 4.2 5.4
Input kW 0.57 0.78 0.87 1.14 1.11 1.43
Weight Indoor kg 15
Outdoor kg 35
Refrigerant lling capacity(R32) kg 1.0
IP code Indoor IP 20
Outdoor IP 24
Permissible excessive
operating pressure LP ps Mpa 2.77
HP ps Mpa 4.17
Noise level Indoor(Super High/
High/Med./Low./Quiet) dB(A) 44/38/32/ 26/20 44/38/31/ 25/18 44/38/32/ 26/20 44/38/31/ 25/18 51/43/36/ 28/20 51/44/36/ 27/18
Outdoor dB(A) 48 46 48 47 48 47
Model Indoor MFZ-KW50VG-A1 MFZ-KW60VG-A1
Outdoor MUFZ-KW50VG-A1 MUFZ-KW50VGHZ-A1 MUFZ-KW60VG-A1 MUFZ-KW60VGHZ-A1
Function Cooling Heating Cooling Heating Cooling Heating Cooling Heating
Power supply ~ /N, 230V, 50Hz
Capacity kW 5.0 5.8 5.0 5.8 6.1 6.5 6.1 6.5
Input kW 1.32 1.53 1.32 1.53 1.73 1.88 1.73 1.88
Weight Indoor kg 15
Outdoor kg 54
Refrigerant lling capacity(R32) kg 1.3
IP code Indoor IP 20
Outdoor IP 24
Permissible excessive
operating pressure LP ps Mpa 2.77
HP ps Mpa 4.17
Noise level Indoor(Super High/
High/Med./Low./Quiet) dB(A) 44/39/35/ 31/27 50/45/40/ 35/29 44/39/35/ 31/27 50/45/40/ 35/29 53/46/39/ 35/27 51/47/41/ 35/29 53/46/39/ 35/27 51/47/41/ 35/29
Outdoor dB(A) 53 56 53 56 53 56 53 56
● OPERATING INSTRUCTIONS ●
EN-13

RH79A055H01
HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN