MITSUBISHI MSZ-FD09NA, MSZ-FD12NA User Manual
SPLIT-TYPE AIR CONDITIONERS
INDOOR UNIT
MSZ-FD09NA
MSZ-FD12NA
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
• Pour avoir la certitude d’utiliser cet appareil correctement et en toute
sécurité, veuillez lire cette notice d’instructions avant de mettre le climatiseur sous tension.
For user
Para los clientes
A l’attention des clients
English
Español
Français
En-1
● OPERATING INSTRUCTIONS ●
CONTENTS
■ SAFETY PRECAUTIONS 1
■ NAME OF EACH PART 3
■ PREPARATION BEFORE OPERATION 4
■ AREA SETTING 5
■ SELECTING OPERATION MODES 6
■ FAN SPEED AND AIRFLOW DIRECTION ADJUSTMENT 7
■ POWERFUL OPERATION 8
■ TIMER OPERATION (ON/OFF TIMER) 8
■ CLEANING 9
■ WHEN YOU THINK THAT TROUBLE HAS OCCURRED 10
■ WHEN THE AIR CONDITIONER IS NOT GOING TO BE USED FOR A LONG TIME 11
■ INSTALLATION PLACE AND ELECTRICAL WORK 11
■ SPECIFICATIONS 11
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, or repaired
by the user.
• An improperly handled air conditioner may cause fi re or
electric shock.
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.
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.
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.
CAUTION
Do not touch the air inlet or the aluminum fi ns of the
indoor/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.
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SAFETY PRECAUTIONS
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 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.
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.
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● OPERATING INSTRUCTIONS ●
NAME OF EACH PART
Indoor unit Remote controller
Display section
Operation
indicator
lamp
Front panel
Air fi lter
Air inlet
Platinum
deodorizing
fi lter
Anti-Allergy
Enzyme
Filter
Air outlet
Horizontal vane
Outdoor unit
Remote control
receiving section
i-see sensor Page 5
Heat
exchanger
Air inlet (back and side)
Emergency
operation
switch Page 6
Operation display
section
ON/OFF
(operate/stop)
button
Operation select
button Page 6
FAN speed
control button
Page 7
POWERFUL
button
Page 8
VANE
control button
Page 7
Lid
Slide down
to open
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 6
Off-timer button Page 8
On-timer button Page 8
WIDE VANE
button Page 7
TIME set buttons Pages 4, 8
Increase time
Decrease time
AREA button Page 5
CLOCK button Page 4
RESET button Page 4
i-see button Page 5
Remote controller
holder
Outdoor units may be different in appearance.
Piping
Drainage hose
Air outlet
Drain outlet
Only use the remote controller provided with the unit.
Do not use other remote controllers.
• Install the remote controller holder in a place where
the signal can be received
by the indoor unit.
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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
Be sure to set the installation position before installing the batteries. Page 5
4.
Press RESET
1.
Remove the front lid
2.
Insert AAA
alkaline batteries
3.
Install the front lid
• 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.
• 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
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 (ºF→ºC)
Unit is preset with ºF.
1.
Press RESET while
the temperature buttons are pressed.
• Press RESET gently using a thin instrument.
• To change temperature unit from ºC to °F, press RESET.
● OPERATING INSTRUCTIONS ●
PREPARATION
BEFORE OPERATION
Setting the installation position
Be sure to set the slide switch inside the remote controller in accordance with
the installed position of the indoor unit.
Installation position:
Left: Distance to objects (wall, cabinet, etc.) is less than 19-11/16 in. (50 cm)
to the left
Center: Distance to objects (wall, cabinet, etc.) is more than 19-11/16 in. (50
cm) to the left and right
Right: Distance to objects (wall, cabinet, etc.) is less than 19-11/16 in. (50 cm)
to the right
(Left) (Center) (Right)
Area Left Center Right
Slide switch
Remote controller
display
Slide switch
AREA SETTING
Press during COOL mode to activate i-see control
operation.
• Press gently using a thin instrument.
• lights. (Operation display section)
Press again to release i-see control operation.
i-see control operation
The sensors constantly measure the room and
fl oor/wall temperature to automatically adjust to
the set temperature by estimating the temperature actually perceived by a person inside the
room (“sensible temperature”).
Room
temperature
30.9%
Humidity
20.7%
Floor/wall
temperature
43.7%
i-see sensor
When the AREA setting is not activated, the sensing range of the i-see sensor
differs depending on the installation location of the air conditioner.
Press to select AREA. Each press changes
AREA in the following order:
Cancel
(AUTO) (Left) (Right) *1
• The i-see control operation has to be active to select AREA.
• Horizontal airflow direction cannot be selected when AREA is
set.
*1 Horizontal airflow direction set by . Page 7
Press until “Cancel” is selected to release AREA
setting.
• Pressing also releases AREA setting.
Area
(AUTO) ....The i-see sensor detects temperature disparities, efficiently
cooling and heating the whole room.
In COOL mode:
Daytime Nighttime
Warm area Cold area
Installation position Left Center Right
Sensing range
Note:
Do not touch the i-see sensor. This may cause malfunction of the i-see sensor.
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(LEFT) / (RIGHT)
Select the desired area to be air conditioned.
Indoor unit display
Horizontal airfl ow direction:
Left RightCenter or Swing
Lighted Not lighted
SELECTING OPERATION MODES
1
Press
to start the operation.
AUTO mode (Auto change over)
The unit selects the operation mode according to the difference between the
room temperature and the set temperature. During AUTO mode, the unit
changes mode (COOL↔HEAT) when the room temperature is 4°F (2°C)
away from the set temperature for more than 15 minutes.
Note:
• Two or more indoor units can be operated by one outdoor unit. When
several indoor units are operated simultaneously, the unit may not be
able to switch operation mode between COOL and HEAT. In this case,
the indoor unit becomes standby mode.
• 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 very low outside temperatures.
(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.
HEAT mode
Enjoy warm air at your desired temperature.
Emergency operation
2
Press to select operation mode. Each press
changes mode in the following order:
(AUTO) (COOL) (DRY) (HEAT)
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 .
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
Emergency HEAT
Set temperature : 75°F (24°C)
Stop
Fan speed : Medium
Horizontal vane : Auto
Note:
The fi rst 30 minutes of operation is test run. Temperature
control does not work, and fan speed is set to High.
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.
Multi system operation
Two or more indoor units can be operated by one outdoor unit. When several
indoor units are operated simultaneously, cooling and heating operations cannot be done at the same time. When COOL is selected with one unit and HEAT
with another or vice versa, the unit operated later becomes standby mode. The
power lamp blinks (display section).
En-6
● OPERATING INSTRUCTIONS ●
FAN SPEED AND AIRFLOW DIRECTION ADJUSTMENT
Vertical airflow direction
(AUTO)
The vane is set to the most effi cient airfl ow direction. COOL/DRY:horizontal
position. HEAT:downward position.
(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 (4)
or (5), the vane automatically moves to horizontal position after 1 hour to
prevent any condensation from dripping.
(Swing)
The vane moves up and down intermittently.
Press to select fan speed. Each press changes
fan speed in the following order:
(AUTO) (Low) (Med.) (High)
• Two short beeps are heard from the indoor unit when set to AUTO.
Press to select vertical 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
)
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POWERFUL OPERATION
TIMER OPERATION (ON/OFF TIMER)
Press
start POWERFUL operation.
Fan speed : Exclusive speed for POWERFUL mode
Horizontal vane : Set position, or downward airflow position during
• Temperature cannot be set during POWERFUL operation.
Press again to cancel POWERFUL operation.
• POWERFUL operation also is cancelled automatically in 15 minutes,
or when the ON/OFF or, FAN button is pressed.
during COOL or HEAT mode Page 6 to
AUTO setting
1
Press 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
2
Press (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 set together. mark indicates the order of timer
operations.
• If power failure occurs while ON/OFF timer is set, see Page 6 “Auto restart
function”
En-8
En-9
● OPERATING INSTRUCTIONS ●
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
• Clean every 2 weeks
• Remove dirt by a vacuum cleaner, or
rinse with water.
• After washing with water, dry it well
in shade.
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 above illustration.
• 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 before installing it.
3. Install the panel by following the removal
procedure in reverse. Close the front panel
securely and press the positions indicated by
the arrows.
i-see sensor
Do not touch the i-see
sensor.
• 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).
Anti-Allergy Enzyme Filter
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-418FT-E
Platinum deodorizing fi lter
Every 3 months:
• Remove dirt by a vacuum cleaner, or soak the fi lter in lukewarm water
(86 to 104°F [30 to 40°C]) for about 15 minutes. Rinse well.
• After washing, dry it well in shade.
• Deodorizing feature recovers by cleaning the fi lter.
When dirt or smell cannot be removed by cleaning:
• Replace it with a new air cleaning fi lter.
• Parts Number MAC-308FT-E
Important
• Clean the fi lters regularly for best performance and to
reduce power consumption.
• Do not touch the i-see sensor.
• 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-10
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. • Is the breaker turned on?
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 air fl ow direction changes
during operation.
The direction of the horizontal
vane cannot be adjusted with
the remote controller.
The operation is stopped for
about 10 minutes in the heating operation.
The unit starts operation by
itself when the main power
is turned on, though it isn’t
operated with the remote
controller.
Multi system
The indoor unit which is not
operating becomes warm and
a sound, similar to water fl owing, is heard from the unit.
When heating operation is
selected, operation does not
start right away.
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.
• Is the power supply plug connected?
• Is the ON timer set? Page 8
• Are the horizontal vane and the vertical vane
installed correctly? Page 9
• This protects the unit according to instructions from the microprocessor. Please
wait.
• The cool air from the unit rapidly cools mois-
ture 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 position
(1) to prevent water from condensing and
dripping.
• In the heating operation, if the air flow
temperature is too low or when defrosting is
being done, the horizontal vane is automatically set to horizontal position.
• Defrosting of the outdoor unit is being
done.
Since this is completed in max.10 minutes,
please wait. (When the outside temperature
is too low and humidity is too high, frost is
formed.)
• 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 6
• A small amount of refrigerant continues to
fl ow into the indoor unit even though it is
not operating.
• When operation is started during defrosting
of outdoor unit is done, it takes a few minutes
(max. 10 minutes) to blow out warm air.
• 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.
• In the heating operation, water condensed
on the heat exchanger drips down.
• In the heating operation, the defrosting operation makes water frozen on the outdoor
unit melt and drip down.
Symptom Explanation & Check points
Outdoor Unit
White smoke is discharged
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 or heat
The room cannot be cooled
or heated suffi ciently.
The room cannot be cooled
suffi ciently.
The room cannot be heated
suffi ciently.
Air does not blow out soon in
the heating operation.
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 POWER 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.
• In the heating operation, vapor generated
by the defrosting operation looks like white
smoke.
• 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 6
• Is the fan setti ng approp ri at e? Plea se
change fan speed to higher setting.
Page 7
• Are the fi lters clean? Page 9
• 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.
• When the outside temperature is low, the
heating effect may not be suffi cient.
• Please wait as the unit is preparing to blow
out warm air.
• Are the fi lters clean? Page 9
• 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 switched.
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