Mitsubishi MSZ09UN User manual

SPLIT-TYPE AIR CONDITIONERS
OPERATING INSTRUCTIONS
MSZ09UN
MSZ12UN
CONTENTS
SAFETY PRECAUTIONS .................................................................................... 2
NAME OF EACH PART ....................................................................................... 4
PREPARATION BEFORE OPERATION .............................................................. 6
I FEEL... AUTO OPERATION .............................................................................. 7
MANUAL OPERATION (COOL, DRY, HEAT) ...................................................... 8
AIR FLOW VELOCITY AND DIRECTION ADJUSTMENT ................................... 9
TIMER OPERATION (ON/OFF TIMER) ............................................................. 10
WHEN THE AIR CONDITIONER IS NOT GOING TO BE USED
FOR A LONG TIME ............................................................................................ 10
MAINTENANCE ................................................................................................. 11
CLEANING THE AIR FILTER AND THE DEODORIZING FILTER (OPTION) ... 11
REPLACEMENT OF THE DEODORIZING FILTER (OPTION)/
AIR CLEANING FILTER (OPTION) ................................................................... 12
BEFORE CONTACTING THE SERVICE REPRESENTATIVE,
CHECK THE FOLLOWING AGAIN .................................................................... 12
WHEN YOU THINK THAT TROUBLE HAS OCCURRED ................................. 13
INSTALLATION, RELOCATION AND INSPECTION ......................................... 14
Thank you very much for purchasing this Mitsubishi room air conditioner.
•To use this unit correctly and safely, be sure to read this operating instructions before use. Keep this manual carefully for
later reference.
•Be sure to receive a guarantee card from your dealer and check that the purchased data and shop name, etc. are
entered correctly.
•This air conditioner should not be installed by the customer. (Safety and performance functions cannot be assured.)
For customers

SPLIT-TYPE AIR CONDITIONERS
OPERATING INSTRUCTIONS
MSZ09UN
MSZ12UN
CONTENTS
SAFETY PRECAUTIONS .................................................................................... 2
NAME OF EACH PART ....................................................................................... 4
PREPARATION BEFORE OPERATION .............................................................. 6
I FEEL... AUTO OPERATION .............................................................................. 7
MANUAL OPERATION (COOL, DRY, HEAT) ...................................................... 8
AIR FLOW VELOCITY AND DIRECTION ADJUSTMENT ................................... 9
TIMER OPERATION (ON/OFF TIMER) ............................................................. 10
WHEN THE AIR CONDITIONER IS NOT GOING TO BE USED
FOR A LONG TIME ............................................................................................ 10
MAINTENANCE ................................................................................................. 11
CLEANING THE AIR FILTER AND THE DEODORIZING FILTER (OPTION) ... 11
REPLACEMENT OF THE DEODORIZING FILTER (OPTION)/
AIR CLEANING FILTER (OPTION) ................................................................... 12
BEFORE CONTACTING THE SERVICE REPRESENTATIVE,
CHECK THE FOLLOWING AGAIN .................................................................... 12
WHEN YOU THINK THAT TROUBLE HAS OCCURRED ................................. 13
INSTALLATION, RELOCATION AND INSPECTION ......................................... 14
Thank you very much for purchasing this Mitsubishi room air conditioner.
•To use this unit correctly and safely, be sure to read this operating instructions before use. Keep this manual carefully for
later reference.
•Be sure to receive a guarantee card from your dealer and check that the purchased data and shop name, etc. are
entered correctly.
•This air conditioner should not be installed by the customer. (Safety and performance functions cannot be assured.)
For customers

2
SAFETY PRECAUTIONS
WARNING
CAUTION
FRONT PANEL ENCLOSURE
AIR OUTLET
ENCLOSURE
WARNING
•This air conditioner is NOT intended for use by children or infirm persons without supervisions.
Do not turn the breaker off/on during
operation.
•This may cause a fire due to spark, etc.
•Be sure to turn off the breaker absolutely after
switching the indoor unit off with the remote con-
troller.
Do not expose your skin directly to cool
air for a long time.
•This could damage your health.
When an abnormality (burning smell,
etc.) occurs, stop the air conditioner
and turn off the breaker.
•If the unit continues to be operated in an abnormal
condition, it may cause a fire, trouble, etc. In this
case, consult your dealer.
Do not insert your finger or a stick, etc.
into the air inlet/outlet.
•Since the fan rotates at high speed, this may cause
an injury.
•Young children should be supervised to ensure that
they do not play with the air conditioner.
Repairs or relocation should not be
done by the customer.
•If this is done incorrectly, it may cause a fire, an elec-
tric shock, or injury from the unit falling, water leak-
ing, etc.
Consult your dealer.
The customer should not install this
unit.
•If this is done incorrectly, it may cause a fire, an
electric shock, or injury from the unit falling, water
leaking, etc.
Consult your dealer.
•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.
Marks and their meanings are as shown below.
Incorrect handling could cause a serious hazard, such as death, serious injury,
etc. with a high probability.
Incorrect handling could cause a serious hazard depending on the conditions.
Meanings of symbols used in this manual are as shown below.
Be sure not to do.
Be sure to follow the instruction.
(Black) Never insert your finger or stick, etc.
(Black) Never step onto the indoor/outdoor unit and do not put anything on them.
(Yellow) Danger of electric shock, be careful.
(Blue) Be sure to shut off the power.
•After reading this manual, keep it together with the installation manual in a handy place for easy
reference.
Warning mark positions and safety devices

2
SAFETY PRECAUTIONS
WARNING
CAUTION
FRONT PANEL ENCLOSURE
AIR OUTLET
ENCLOSURE
WARNING
•This air conditioner is NOT intended for use by children or infirm persons without supervisions.
Do not turn the breaker off/on during
operation.
•This may cause a fire due to spark, etc.
•Be sure to turn off the breaker absolutely after
switching the indoor unit off with the remote con-
troller.
Do not expose your skin directly to cool
air for a long time.
•This could damage your health.
When an abnormality (burning smell,
etc.) occurs, stop the air conditioner
and turn off the breaker.
•If the unit continues to be operated in an abnormal
condition, it may cause a fire, trouble, etc. In this
case, consult your dealer.
Do not insert your finger or a stick, etc.
into the air inlet/outlet.
•Since the fan rotates at high speed, this may cause
an injury.
•Young children should be supervised to ensure that
they do not play with the air conditioner.
Repairs or relocation should not be
done by the customer.
•If this is done incorrectly, it may cause a fire, an elec-
tric shock, or injury from the unit falling, water leak-
ing, etc.
Consult your dealer.
The customer should not install this
unit.
•If this is done incorrectly, it may cause a fire, an
electric shock, or injury from the unit falling, water
leaking, etc.
Consult your dealer.
•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.
Marks and their meanings are as shown below.
Incorrect handling could cause a serious hazard, such as death, serious injury,
etc. with a high probability.
Incorrect handling could cause a serious hazard depending on the conditions.
Meanings of symbols used in this manual are as shown below.
Be sure not to do.
Be sure to follow the instruction.
(Black) Never insert your finger or stick, etc.
(Black) Never step onto the indoor/outdoor unit and do not put anything on them.
(Yellow) Danger of electric shock, be careful.
(Blue) Be sure to shut off the power.
•After reading this manual, keep it together with the installation manual in a handy place for easy
reference.
Warning mark positions and safety devices

3
SAFETY PRECAUTIONS
CAUTION
When the air filter is to be
removed, do not touch
the metal parts of the in-
door unit.
•This may cause an injury.
When the unit is to be
cleaned, switch it off and
turn off the breaker.
•Since the fan rotates at high
speed during operation, this may
cause an injury.
Do not operate switches
with wet hands.
•This may cause an electric shock.
Do not clean the air con-
ditioner with water.
•Water may enter the unit and de-
grade the insulation. This may
cause an electric shock.
Do not put a pet or house-
plant where it will be ex-
posed to direct airflow.
•This could injure the pet or plant.
Do not use an insecticide
or flammable spray.
•This may cause a fire or deforma-
tion of the cabinet.
Ventilate well in using the
unit with a stove, etc.
•An oxygen shortage may occur.
Do not use the unit for
special purposes.
•Do not use this air conditioner to
preserve precision devices, food,
animals, plants and art objects.
This may cause deterioration of
quality, etc.
Do not put a stove, etc.
where they are exposed
to direct airflow.
•This may cause imperfect com-
bustion.
When the unit is not go-
ing to be used for a long
time, turn off the breaker.
•Otherwise, dirt may collect and
this may cause a fire.
Do not step or put any-
thing on the indoor/out-
door unit.
•This may cause an injury, etc. if
you or something falls down.
Do not leave the unit on
an installation stand
which is damaged.
•The unit may fall and this may
cause an injury.
Do not operate the unit
for a long time in high hu-
midity, e.g. leaving a door
or window open.
•In the cooling mode, if the unit is
operated in a room with high hu-
midity (80% RH or more) for a long
time, water condensed in the air
conditioner may drop and wet or
damage furniture, etc.
Do not step onto an un-
stable bench when main-
taining the unit, etc.
•This may cause an injury, etc. if
you fall down.
Replace the 2 batteries
with new ones of same
type.
•Using an old battery together with
a new one may result in heat gen-
eration, leakage or an explosion.
Do not charge or disas-
semble the batteries and
do not throw them into a
fire.
•This may result in leakage, fire or
an explosion.
If liquid from the alkaline
batteries gets onto your
skin or clothes, wash it
well with clean water.
•If liquid from the alkaline batter-
ies gets into your eyes, wash
them well with clean water and
consult a doctor at once.

3
SAFETY PRECAUTIONS
CAUTION
When the air filter is to be
removed, do not touch
the metal parts of the in-
door unit.
•This may cause an injury.
When the unit is to be
cleaned, switch it off and
turn off the breaker.
•Since the fan rotates at high
speed during operation, this may
cause an injury.
Do not operate switches
with wet hands.
•This may cause an electric shock.
Do not clean the air con-
ditioner with water.
•Water may enter the unit and de-
grade the insulation. This may
cause an electric shock.
Do not put a pet or house-
plant where it will be ex-
posed to direct airflow.
•This could injure the pet or plant.
Do not use an insecticide
or flammable spray.
•This may cause a fire or deforma-
tion of the cabinet.
Ventilate well in using the
unit with a stove, etc.
•An oxygen shortage may occur.
Do not use the unit for
special purposes.
•Do not use this air conditioner to
preserve precision devices, food,
animals, plants and art objects.
This may cause deterioration of
quality, etc.
Do not put a stove, etc.
where they are exposed
to direct airflow.
•This may cause imperfect com-
bustion.
When the unit is not go-
ing to be used for a long
time, turn off the breaker.
•Otherwise, dirt may collect and
this may cause a fire.
Do not step or put any-
thing on the indoor/out-
door unit.
•This may cause an injury, etc. if
you or something falls down.
Do not leave the unit on
an installation stand
which is damaged.
•The unit may fall and this may
cause an injury.
Do not operate the unit
for a long time in high hu-
midity, e.g. leaving a door
or window open.
•In the cooling mode, if the unit is
operated in a room with high hu-
midity (80% RH or more) for a long
time, water condensed in the air
conditioner may drop and wet or
damage furniture, etc.
Do not step onto an un-
stable bench when main-
taining the unit, etc.
•This may cause an injury, etc. if
you fall down.
Replace the 2 batteries
with new ones of same
type.
•Using an old battery together with
a new one may result in heat gen-
eration, leakage or an explosion.
Do not charge or disas-
semble the batteries and
do not throw them into a
fire.
•This may result in leakage, fire or
an explosion.
If liquid from the alkaline
batteries gets onto your
skin or clothes, wash it
well with clean water.
•If liquid from the alkaline batter-
ies gets into your eyes, wash
them well with clean water and
consult a doctor at once.

4
Operation Indicator
For installation
WARNING
•Consult your dealer for installation of the air conditioner.
CAUTION
Ground the unit.
•Do not connect the ground to a gas pipe,
water pipe, lightning rod or the ground of
a telephone. If the grounding is incorrect,
it may cause an electric shock.
Do not install the unit where flammable
gas could leak.
•If gas leaks and collects around the unit, it may
cause an explosion.
SAFETY PRECAUTIONS
If the air conditioner is installed in a high
humidity area or near a water source, a
Ground Fault Interrupt (GFI) circuit
breaker should be installed to protect
against an electric shock.
Drain should be fully drained.
•If the drainage route is incomplete, water may drop
from the unit. This may wet and damage the furni-
ture.
NAME OF EACH PART
Outdoor unit
Air inlet (back and side)
Piping
Drainage hose
Air outlet
Drain outlet
Service panel
Indoor unit
Air cleaning filter
(White bellows
type) (OPTION)
Deodorizing filter
(Gray sponge
type) (OPTION)
Air filter
Vertical vane
Operation section
(When the front panel is opened)
Front panel
Air inlet
Remote control
receiving section
Remote
controller
Display section
MSZ09UN MSZ09UN
MSZ12UN MSZ12UN
Horizontal vane
Emergency
operation switch
Emergency
operation switch
Operation
Indicator lamp Receiving section
Operation
Indicator lamp
Receiving
section
MSZ09UN MSZ12UN

4
Operation Indicator
For installation
WARNING
•Consult your dealer for installation of the air conditioner.
CAUTION
Ground the unit.
•Do not connect the ground to a gas pipe,
water pipe, lightning rod or the ground of
a telephone. If the grounding is incorrect,
it may cause an electric shock.
Do not install the unit where flammable
gas could leak.
•If gas leaks and collects around the unit, it may
cause an explosion.
SAFETY PRECAUTIONS
If the air conditioner is installed in a high
humidity area or near a water source, a
Ground Fault Interrupt (GFI) circuit
breaker should be installed to protect
against an electric shock.
Drain should be fully drained.
•If the drainage route is incomplete, water may drop
from the unit. This may wet and damage the furni-
ture.
NAME OF EACH PART
Outdoor unit
Air inlet (back and side)
Piping
Drainage hose
Air outlet
Drain outlet
Service panel
Indoor unit
Air cleaning filter
(White bellows
type) (OPTION)
Deodorizing filter
(Gray sponge
type) (OPTION)
Air filter
Vertical vane
Operation section
(When the front panel is opened)
Front panel
Air inlet
Remote control
receiving section
Remote
controller
Display section
MSZ09UN MSZ09UN
MSZ12UN MSZ12UN
Horizontal vane
Emergency
operation switch
Emergency
operation switch
Operation
Indicator lamp Receiving section
Operation
Indicator lamp
Receiving
section
MSZ09UN MSZ12UN

5
ON/OFF
TOO
COOL
AMPM
CLOCK
AMPM
TOO
WARM
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
HEAT
MODE
STOP
START
HR.
MIN.
I FEEL COOL
DRY
AMPM
CLOCK
AMPM
RESET CLOCK
˚F
NAME OF EACH PART
Remote controller
Operation display section
ON/OFF (operate/
stop) button
Operation select button
Fan speed control button
On-timer button
CLOCK set button
HR.button
MIN.button
(Time set button)
Temperature buttons
Vane control button
Off-timer button
RESET button
(This diagram shows an overall view.)
Open the front lid.
Signal transmitting section

5
ON/OFF
TOO
COOL
AMPM
CLOCK
AMPM
TOO
WARM
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
HEAT
MODE
STOP
START
HR.
MIN.
I FEEL COOL
DRY
AMPM
CLOCK
AMPM
RESET CLOCK
˚F
NAME OF EACH PART
Remote controller
Operation display section
ON/OFF (operate/
stop) button
Operation select button
Fan speed control button
On-timer button
CLOCK set button
HR.button
MIN.button
(Time set button)
Temperature buttons
Vane control button
Off-timer button
RESET button
(This diagram shows an overall view.)
Open the front lid.
Signal transmitting section

6
FAN
VANE
MODE
STOP
START
HR.
MIN.
I FEEL COOL
DRY
RESET CLOCK
HEAT
PREPARATION BEFORE OPERATION
Breaker for the air conditioner
■Turn the breaker on.
Handling of the remote controller
•The range that the signal can reach is about
20 ft. when the remote controller is pointed at the
front of the indoor unit.
•When a button is pressed, one or two beeps will
be heard from the indoor unit. If no sound is heard,
operate again.
•Use the remote controller carefully.
If it is dropped, thrown or it gets wet, the remote
controller may not operate.
When installing on a wall, etc.
•Install the remote controller holder in a position
where the signal reception sound (beep) can be
heard from the indoor unit when the
ON/OFF
button is
pressed.
How to install/remove the remote controller
Installing Insert the remote controller downward.
Removing Pull it up.
Dry-cell batteries
Reference for replacing batteries
When the indoor unit does not respond to the signal
from the remote controller, or the display becomes
dim, replace the batteries with new ones (size AAA).
•Though both alkaline batteries and manganese
batteries can be used, alkaline batteries are rec-
ommended because their service life is longer than
that of manganese batteries.
•The service life of an alkaline battery is about 1 year.
However, a battery which the time limit is ap-
proaching may be exhausted soon. The recom-
mended usable time limit is indicated (month/year)
on the bottom of the battery.
•Replace the 2 batteries with new ones of the same
type.
•Do not use rechargeable batteries.
•To prevent liquid leakage, take out all batteries
when the remote controller is not going to be used
for a long time.
•Dispose of exhausted batteries in the correct man-
ner.
Remote controller (How to set the batteries and the current time)
1Remove the front lid and insert bat-
teries. Then reattach the front lid.
Insert the minus pole of the batteries first.
Check if the polarity of the batteries is correct.
2Press the RESET button.
■If the RESET button is not pressed, the remote control-
ler may not operate correctly.
3Press the CLOCK set button.
4Press the
HR.
and
MIN.
button
(TIME SET button) to set the current
time.
■Each time the
HR.
button is pressed, the set time in-
creases by 1 hour, and each time the
MIN.
button is
pressed, the set time increases by 1 minute.
5Press the CLOCK set button again
and close the front lid.
When the remote controller cannot
be used (emergency operation)
When the batteries of the remote controller run out or
the remote controller malfunctions, the emergency op-
eration can be done using the EMERGENCY OPERA-
TION switch.
1Press the EMERGENCY OPERA-
TION switch.
* Each time the EMERGENCY OPERATION
switch is pressed, the unit will operate in order
of EMERGENCY COOL MODE, EMERGENCY
HEAT MODE and STOP MODE.
However, when the EMERGENCY OPERA-
TION switch is once pressed, the unit will oper-
ate in test run for 30 minutes and then the op-
eration mode shifts to EMERGENCY MODE.
MSZ09UN MSZ12UN
Details of EMERGENCY MODE are as shown below.
However, the temperature control does not work for 30
minutes in test run and the unit is set to continuous
operation. The fan speed is set to High in test run and
shifts to Medium after 30 minutes.
Operation mode COOL HEAT
Set temperature 75 °F 75 °F
Fan speed Medium Medium
Horizontal vane Auto Auto
The operation mode is indicated by the Operation Indi-
cator lamp on the indoor unit as following figures.
Operation Indicator lamp
MSZ09UN
EMERGENCY COOL EMERGENCY HEAT STOP
MSZ12UN
EMERGENCY COOL EMERGENCY HEAT STOP
■
To stop the emergency operation,
press the EMERGENCY OPERATION
switch once (in case of EMER-
GENCY HEAT MODE) or twice (in
case of EMERGENCY COOL MODE).
Press using
a thin stick.
Press using
a thin stick. Remote controller
holder
Auto restart function
■These models are equipped with an auto restart function. If you do not want to use this function, please consult the service representative because the setting of the
unit needs to be changed.
Auto restart function is ...
When the indoor unit is controlled with the remote controller, the operation mode, the set temperature and
the fan speed are stored in the memory. If a power failure occurs or the main power is turned off during
operation, “Auto restart function”sets automatically to start operating in the same mode as the one set with
the remote controller just before the shutoff of the main power. (Refer to page 7 for details.)
Insert the minus
pole of the
batteries first.
Operation
Indicator
Operation
Indicator
Operation
Indicator
Operation IndicatorOperation IndicatorOperation Indicator

6
FAN
VANE
MODE
STOP
START
HR.
MIN.
I FEEL COOL
DRY
RESET CLOCK
HEAT
PREPARATION BEFORE OPERATION
Breaker for the air conditioner
■Turn the breaker on.
Handling of the remote controller
•The range that the signal can reach is about
20 ft. when the remote controller is pointed at the
front of the indoor unit.
•When a button is pressed, one or two beeps will
be heard from the indoor unit. If no sound is heard,
operate again.
•Use the remote controller carefully.
If it is dropped, thrown or it gets wet, the remote
controller may not operate.
When installing on a wall, etc.
•Install the remote controller holder in a position
where the signal reception sound (beep) can be
heard from the indoor unit when the
ON/OFF
button is
pressed.
How to install/remove the remote controller
Installing Insert the remote controller downward.
Removing Pull it up.
Dry-cell batteries
Reference for replacing batteries
When the indoor unit does not respond to the signal
from the remote controller, or the display becomes
dim, replace the batteries with new ones (size AAA).
•Though both alkaline batteries and manganese
batteries can be used, alkaline batteries are rec-
ommended because their service life is longer than
that of manganese batteries.
•The service life of an alkaline battery is about 1 year.
However, a battery which the time limit is ap-
proaching may be exhausted soon. The recom-
mended usable time limit is indicated (month/year)
on the bottom of the battery.
•Replace the 2 batteries with new ones of the same
type.
•Do not use rechargeable batteries.
•To prevent liquid leakage, take out all batteries
when the remote controller is not going to be used
for a long time.
•Dispose of exhausted batteries in the correct man-
ner.
Remote controller (How to set the batteries and the current time)
1Remove the front lid and insert bat-
teries. Then reattach the front lid.
Insert the minus pole of the batteries first.
Check if the polarity of the batteries is correct.
2Press the RESET button.
■If the RESET button is not pressed, the remote control-
ler may not operate correctly.
3Press the CLOCK set button.
4Press the
HR.
and
MIN.
button
(TIME SET button) to set the current
time.
■Each time the
HR.
button is pressed, the set time in-
creases by 1 hour, and each time the
MIN.
button is
pressed, the set time increases by 1 minute.
5Press the CLOCK set button again
and close the front lid.
When the remote controller cannot
be used (emergency operation)
When the batteries of the remote controller run out or
the remote controller malfunctions, the emergency op-
eration can be done using the EMERGENCY OPERA-
TION switch.
1Press the EMERGENCY OPERA-
TION switch.
* Each time the EMERGENCY OPERATION
switch is pressed, the unit will operate in order
of EMERGENCY COOL MODE, EMERGENCY
HEAT MODE and STOP MODE.
However, when the EMERGENCY OPERA-
TION switch is once pressed, the unit will oper-
ate in test run for 30 minutes and then the op-
eration mode shifts to EMERGENCY MODE.
MSZ09UN MSZ12UN
Details of EMERGENCY MODE are as shown below.
However, the temperature control does not work for 30
minutes in test run and the unit is set to continuous
operation. The fan speed is set to High in test run and
shifts to Medium after 30 minutes.
Operation mode COOL HEAT
Set temperature 75 °F 75 °F
Fan speed Medium Medium
Horizontal vane Auto Auto
The operation mode is indicated by the Operation Indi-
cator lamp on the indoor unit as following figures.
Operation Indicator lamp
MSZ09UN
EMERGENCY COOL EMERGENCY HEAT STOP
MSZ12UN
EMERGENCY COOL EMERGENCY HEAT STOP
■
To stop the emergency operation,
press the EMERGENCY OPERATION
switch once (in case of EMER-
GENCY HEAT MODE) or twice (in
case of EMERGENCY COOL MODE).
Press using
a thin stick.
Press using
a thin stick. Remote controller
holder
Auto restart function
■These models are equipped with an auto restart function. If you do not want to use this function, please consult the service representative because the setting of the
unit needs to be changed.
Auto restart function is ...
When the indoor unit is controlled with the remote controller, the operation mode, the set temperature and
the fan speed are stored in the memory. If a power failure occurs or the main power is turned off during
operation, “Auto restart function”sets automatically to start operating in the same mode as the one set with
the remote controller just before the shutoff of the main power. (Refer to page 7 for details.)
Insert the minus
pole of the
batteries first.
Operation
Indicator
Operation
Indicator
Operation
Indicator
Operation IndicatorOperation IndicatorOperation Indicator

7
Operation state
This shows that the air conditioner is operating to reach the
target temperature. Please wait until the target temperature
is obtained.
This shows that the room temperature is approaching the
target temperature.
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
MODE
STOP
START
HR.
MIN.
I FEEL COOL
DRY
AMPM
CLOCK
˚C
AMPM
HEAT
RESET CLOCK
Details of operation
According to the room temperature when the operation starts, the opera-
tion mode is automatically set to COOL, DRY or HEAT. However, when
operation is started again within 2 hours after it is stopped, the same
operation mode before the operation is stopped is selected. The opera-
tion mode selected first is not changed even if the room temperature
changes. If the operation mode does not match the room condition, se-
lect the appropriate operation mode by pressing the
MODE
button.
Details of auto operation
Room temperature Operation mode Target temperature
when started (initial state)
About 77 °F or higher COOL About 75 °F
About 77 °F - 73 °FDRY —
About 73 °F or lower HEAT About 79 °F
FAN
VANE
HEAT
MODE
ECONO COOL
STOP
START
HR.
MIN.
I FEEL COOL
DRY
I FEEL... AUTO OPERATION
With the “(I FEEL...)”auto operation mode,
the optimum room condition can be set automati-
cally with a one-touch operation.
•To start operation:
■Press the
ON/OFF
button.
When the “(I FEEL...)”mode is selected, the air
conditioner is automatically controlled at the optimum
temperature.
•To stop operation:
■Press the
ON/OFF
button.
•If you feel slightly warm:
■Press the
TOO
WARM
button to lower the tempera-
ture.
One press lowers the temperature by about 2 °F.
•If you feel slightly cool:
■Press the
TOO
COOL
button to raise the tempera-
ture.
One press raises the temperature by about 2 °F.
When “(I FEEL...)”is not selected, press
the
MODE
button until it is set.
Each time the button is pressed, the operation mode is
changed in sequence: (I FEEL...) →(COOL) →(DRY)
→(HEAT)
NOTE
COOL: When the room temperature is 4 °F higher than the set temperature, the set temperature may not be changed
since the air conditioner is operating to reach the target (set) temperature. In this case, please wait until
the room temperature drops to within 4 °F of the set temperature and then change the set temperature.
HEAT: When the room temperature is 4 °F lower than the set temperature, the set temperature may not be
changed since the air conditioner is operating to reach the target (set) temperature. In this case,
please wait until the room temperature rises to within 4 °F of the set temperature and then change the
set temperature.
Details of display on the indoor unit
The operation indicator at the right side of the indoor unit indicates
the operation state.
MSZ09UN MSZ12UN
Operation indicator lamp
MSZ09UN
Indication Difference between target
temperature and room temperature
About 4 °F or more
About 4 °F or less
Operation
Indicator
Lighted
Not lighted
Description of “AUTO RESTART FUNCTION”
■These units are equipped with an auto restart function. When the main power is turned on, the air conditioner will start
operation automatically in the same mode as the one set with the remote controller before the shutoff of the main power.
■If the unit was set to off with the remote controller before the shutoff of the main power, it will remain stopped even after
the main power is turned on.
■If the unit was in the emergency operation before the shutoff of the main power, it will start operation, when main power
comes on, in the same mode as the one set with the remote controller before the emergency operation.
■If the unit is operated in “I FEEL ...”mode before power failure, the operation is not stored in the memory. In “I FEEL ...”
mode, the operation is decided by the initial room temperature at (re)start.
■Since the air conditioner has been shipped from the factory with the COOL mode saved in the memory for auto restart
function, it starts cooling operation when the user turns on the main power for the first time after installation.
Description of “I FEEL...”mode
Room temperature:
About 77 °F or higher
→COOL
About 77 °F - 73 °F→DRY
About 73 °F or lower
→HEAT
Lighted
Not lighted
Operation Indicator
MSZ12UN
Operation state
This shows that the air conditioner is operating to reach the
target temperature. Please wait until the target temperature
is obtained.
This shows that the room temperature is approaching the
target temperature.
Indication Difference between target
temperature and room temperature
About 4 °F or more
About 4 °F or less

7
Operation state
This shows that the air conditioner is operating to reach the
target temperature. Please wait until the target temperature
is obtained.
This shows that the room temperature is approaching the
target temperature.
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
MODE
STOP
START
HR.
MIN.
I FEEL COOL
DRY
AMPM
CLOCK
˚C
AMPM
HEAT
RESET CLOCK
Details of operation
According to the room temperature when the operation starts, the opera-
tion mode is automatically set to COOL, DRY or HEAT. However, when
operation is started again within 2 hours after it is stopped, the same
operation mode before the operation is stopped is selected. The opera-
tion mode selected first is not changed even if the room temperature
changes. If the operation mode does not match the room condition, se-
lect the appropriate operation mode by pressing the
MODE
button.
Details of auto operation
Room temperature Operation mode Target temperature
when started (initial state)
About 77 °F or higher COOL About 75 °F
About 77 °F - 73 °FDRY —
About 73 °F or lower HEAT About 79 °F
FAN
VANE
HEAT
MODE
ECONO COOL
STOP
START
HR.
MIN.
I FEEL COOL
DRY
I FEEL... AUTO OPERATION
With the “(I FEEL...)”auto operation mode,
the optimum room condition can be set automati-
cally with a one-touch operation.
•To start operation:
■Press the
ON/OFF
button.
When the “(I FEEL...)”mode is selected, the air
conditioner is automatically controlled at the optimum
temperature.
•To stop operation:
■Press the
ON/OFF
button.
•If you feel slightly warm:
■Press the
TOO
WARM
button to lower the tempera-
ture.
One press lowers the temperature by about 2 °F.
•If you feel slightly cool:
■Press the
TOO
COOL
button to raise the tempera-
ture.
One press raises the temperature by about 2 °F.
When “(I FEEL...)”is not selected, press
the
MODE
button until it is set.
Each time the button is pressed, the operation mode is
changed in sequence: (I FEEL...) →(COOL) →(DRY)
→(HEAT)
NOTE
COOL: When the room temperature is 4 °F higher than the set temperature, the set temperature may not be changed
since the air conditioner is operating to reach the target (set) temperature. In this case, please wait until
the room temperature drops to within 4 °F of the set temperature and then change the set temperature.
HEAT: When the room temperature is 4 °F lower than the set temperature, the set temperature may not be
changed since the air conditioner is operating to reach the target (set) temperature. In this case,
please wait until the room temperature rises to within 4 °F of the set temperature and then change the
set temperature.
Details of display on the indoor unit
The operation indicator at the right side of the indoor unit indicates
the operation state.
MSZ09UN MSZ12UN
Operation indicator lamp
MSZ09UN
Indication Difference between target
temperature and room temperature
About 4 °F or more
About 4 °F or less
Operation
Indicator
Lighted
Not lighted
Description of “AUTO RESTART FUNCTION”
■These units are equipped with an auto restart function. When the main power is turned on, the air conditioner will start
operation automatically in the same mode as the one set with the remote controller before the shutoff of the main power.
■If the unit was set to off with the remote controller before the shutoff of the main power, it will remain stopped even after
the main power is turned on.
■If the unit was in the emergency operation before the shutoff of the main power, it will start operation, when main power
comes on, in the same mode as the one set with the remote controller before the emergency operation.
■If the unit is operated in “I FEEL ...”mode before power failure, the operation is not stored in the memory. In “I FEEL ...”
mode, the operation is decided by the initial room temperature at (re)start.
■Since the air conditioner has been shipped from the factory with the COOL mode saved in the memory for auto restart
function, it starts cooling operation when the user turns on the main power for the first time after installation.
Description of “I FEEL...”mode
Room temperature:
About 77 °F or higher
→COOL
About 77 °F - 73 °F→DRY
About 73 °F or lower
→HEAT
Lighted
Not lighted
Operation Indicator
MSZ12UN
Operation state
This shows that the air conditioner is operating to reach the
target temperature. Please wait until the target temperature
is obtained.
This shows that the room temperature is approaching the
target temperature.
Indication Difference between target
temperature and room temperature
About 4 °F or more
About 4 °F or less

8
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
MODE
STOP
START
HR.
MIN.
I FEEL COOL
DRY
AMPM
CLOCK
˚F
AMPM
HEAT
RESET CLOCK
MANUAL OPERATION (COOL, DRY, HEAT)
To select the COOL, DRY or HEAT mode
1Press the
ON/OFF
button.
2Select the operation mode by pressing the
MODE
button.
Each time this button is pressed, the operation mode
is changed in sequence: (I FEEL...) →(COOL)
→(DRY) →(HEAT)
To stop operation:
■Press the
ON/OFF
button.
After the operation mode is set once, the operation
starts in the same mode as the one set previously
from the next time by simply pressing the
ON/OFF
button.
■When the set temperature is to be changed:
■Press the
TOO
WARM
button to lower the temperature. One
press lowers the temperature by about 2 °F.
■Press the
TOO
COOL
button to raise the temperature. One
press raises the temperature by about 2 °F.
In DRY operation
■The temperature control (temperature setting) can-
not be done.
■The room temperature is slightly lowered in this
operation mode.
■The details of the display on the indoor unit
are explained on page 7.
NOTE
When the ambient temperature is too high, the room tem-
perature may not reach the set temperature since the unit
operates to cool the room under a high load.
CONVENIENT INFORMATION
COOL For effective cooling
1Close the windows and pull
down blinds. Sunshine is re-
duced and cooling efficiency
increases.
2Paste a heat shield film (gen-
erally available) on the window.
Heat entering the room is re-
duced.
3Block the outdoor unit from di-
rect sunlight. This saves en-
ergy.
Description of “AUTO RESTART FUNCTION”
Refer to page 7.
HEAT Comfortable warmth depends on the temperature difference between the indoor and
the outdoor.
It is recommended that the set temperature in the heating operation does not differ from the external tem-
perature too much.Though there is a regional difference, as a reference, a set temperature between about
71 °F and 75 °F would be suitable.
DRY The humidity at which people feel comfortable
When air contains too much moisture, people feel uncomfortable. Humidity is related to temperature and
wind. The humidity at which people feel comfortable is 60 % - 75 % RH in summer, 55 % - 70 % RH in
winter.

8
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
MODE
STOP
START
HR.
MIN.
I FEEL COOL
DRY
AMPM
CLOCK
˚F
AMPM
HEAT
RESET CLOCK
MANUAL OPERATION (COOL, DRY, HEAT)
To select the COOL, DRY or HEAT mode
1Press the
ON/OFF
button.
2Select the operation mode by pressing the
MODE
button.
Each time this button is pressed, the operation mode
is changed in sequence: (I FEEL...) →(COOL)
→(DRY) →(HEAT)
To stop operation:
■Press the
ON/OFF
button.
After the operation mode is set once, the operation
starts in the same mode as the one set previously
from the next time by simply pressing the
ON/OFF
button.
■When the set temperature is to be changed:
■Press the
TOO
WARM
button to lower the temperature. One
press lowers the temperature by about 2 °F.
■Press the
TOO
COOL
button to raise the temperature. One
press raises the temperature by about 2 °F.
In DRY operation
■The temperature control (temperature setting) can-
not be done.
■The room temperature is slightly lowered in this
operation mode.
■The details of the display on the indoor unit
are explained on page 7.
NOTE
When the ambient temperature is too high, the room tem-
perature may not reach the set temperature since the unit
operates to cool the room under a high load.
CONVENIENT INFORMATION
COOL For effective cooling
1Close the windows and pull
down blinds. Sunshine is re-
duced and cooling efficiency
increases.
2Paste a heat shield film (gen-
erally available) on the window.
Heat entering the room is re-
duced.
3Block the outdoor unit from di-
rect sunlight. This saves en-
ergy.
Description of “AUTO RESTART FUNCTION”
Refer to page 7.
HEAT Comfortable warmth depends on the temperature difference between the indoor and
the outdoor.
It is recommended that the set temperature in the heating operation does not differ from the external tem-
perature too much.Though there is a regional difference, as a reference, a set temperature between about
71 °F and 75 °F would be suitable.
DRY The humidity at which people feel comfortable
When air contains too much moisture, people feel uncomfortable. Humidity is related to temperature and
wind. The humidity at which people feel comfortable is 60 % - 75 % RH in summer, 55 % - 70 % RH in
winter.

9
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
MODE
STOP
START
HR.
MIN.
I FEEL COOL
DRY
AMPM
CLOCK
˚C
AMPM
HEAT
RESET CLOCK
AIR FLOW VELOCITY AND DIRECTION ADJUSTMENT
AIR FLOW velocity and direction can be selected
as required.
Auto air flow direction control operation
■When the AUTO mode is selected with the
VANE
button, the position of the horizontal vane is automatically set
to correspond to the operation mode for effective operation.
(1) HEAT
When the air flow temperature is too low, When the air flow temperature rises,
the air is blown out horizontally. the air is blown out downwards.
(2) COOL, DRY
The air is blown out horizontally.
■To change the horizontal direction of the air flow, move the vertical vane manu- ally.
Adjust the vane before operation starts.
Since the horizontal vane moves automatically, your fingers may be caught.
■To change the AIR FLOW velocity, press the
FAN
button.
Each time the button is pressed, the fan speed is
changed in sequence: (Low) →(Med.) →(High)
→(AUTO)
•Use the (High) notch to cool/heat the room more.
•If the operating sound of the air conditioner disturbs your
sleep, use the (Low) notch.
■To change the AIR FLOW blowing direc- tion vertically, press the
VANE
button.
Each time the button is pressed, the angle of the hori-
zontal vane is changed in sequence: (1) →(2) →
(3) →(4) →(5) →(SWING) →(AUTO)
SWING OPERATION
Use the swing operation for the air flow to reach all cor-
ners of the room.
Recommended horizontal
vane range
Use the (AUTO) position usu-
ally.
Use position (1) or (2) in the
COOL or DRY mode and use posi-
tions (3) to (5) in the HEAT mode
when adjusting to your require-
ments.
NOTE
■In the cooling operation, when the air conditioner is op-
erated with setting the horizontal vane to (4) or (5) for
1 hour, the AIR FLOW direction is automatically set to
horizontal to prevent condensed water from dropping.
■Adjust the vertical AIR FLOW direction using the remote
controller. If the horizontal vane is moved manually, it
may cause trouble.
■In the heating operation, if the air flow temperature is
too low or when defrosting is being done, the horizontal
vane position is set to (1).
COOL
DRY
HEAT
1
2
3
4
5

9
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
MODE
STOP
START
HR.
MIN.
I FEEL COOL
DRY
AMPM
CLOCK
˚C
AMPM
HEAT
RESET CLOCK
AIR FLOW VELOCITY AND DIRECTION ADJUSTMENT
AIR FLOW velocity and direction can be selected
as required.
Auto air flow direction control operation
■When the AUTO mode is selected with the
VANE
button, the position of the horizontal vane is automatically set
to correspond to the operation mode for effective operation.
(1) HEAT
When the air flow temperature is too low, When the air flow temperature rises,
the air is blown out horizontally. the air is blown out downwards.
(2) COOL, DRY
The air is blown out horizontally.
■To change the horizontal direction of the air flow, move the vertical vane manu- ally.
Adjust the vane before operation starts.
Since the horizontal vane moves automatically, your fingers may be caught.
■To change the AIR FLOW velocity, press the
FAN
button.
Each time the button is pressed, the fan speed is
changed in sequence: (Low) →(Med.) →(High)
→(AUTO)
•Use the (High) notch to cool/heat the room more.
•If the operating sound of the air conditioner disturbs your
sleep, use the (Low) notch.
■To change the AIR FLOW blowing direc- tion vertically, press the
VANE
button.
Each time the button is pressed, the angle of the hori-
zontal vane is changed in sequence: (1) →(2) →
(3) →(4) →(5) →(SWING) →(AUTO)
SWING OPERATION
Use the swing operation for the air flow to reach all cor-
ners of the room.
Recommended horizontal
vane range
Use the (AUTO) position usu-
ally.
Use position (1) or (2) in the
COOL or DRY mode and use posi-
tions (3) to (5) in the HEAT mode
when adjusting to your require-
ments.
NOTE
■In the cooling operation, when the air conditioner is op-
erated with setting the horizontal vane to (4) or (5) for
1 hour, the AIR FLOW direction is automatically set to
horizontal to prevent condensed water from dropping.
■Adjust the vertical AIR FLOW direction using the remote
controller. If the horizontal vane is moved manually, it
may cause trouble.
■In the heating operation, if the air flow temperature is
too low or when defrosting is being done, the horizontal
vane position is set to (1).
COOL
DRY
HEAT
1
2
3
4
5

10
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
MODE
STOP
START
HR.
MIN.
I FEEL COOL
DRY
AMPM
CLOCK
˚C
AMPM
HEAT
RESET CLOCK
WHEN THE AIR CONDITIONER IS NOT GOING
TO BE USED FOR A LONG TIME
Clean the
filter before
installing.
TIMER OPERATION (ON/OFFTIMER)
It is convenient to set the timer when you go to
bed, when you get home, when you get up, etc.
How to set the ON timer
1Press the
START
button during operation.
Each time the button is pressed, the ON timer mode
alternates between ON and OFF.
2Set the time of the timer using the
HR.
and
MIN.
buttons.
Each time the
HR.
button is pressed, the set time in-
creases by 1 hour; each time the
MIN.
button is
pressed, the set time increases by 10 minutes.
To release the ON timer:
■Press the
START
button.
How to set the OFF timer
1Press the
STOP
button during operation.
Each time the button is pressed, the OFF timer mode
alternates between ON and OFF.
2Set the time of the timer using the
HR.
and
MIN.
buttons.
Each time the
HR.
button is pressed, the set time in-
creases by 1 hour; each time the
MIN.
button is
pressed, the set time increases by 10 minutes.
To release the OFF timer:
■Press the
STOP
button.
Programming timer operation
The ON timer and the OFF timer can be used in combination.
The timer of the set time that is reached first will operate first.
(“”mark indicates the order of timer operations.)
■If the current time has not been set, the timer operation can-
not be used.
When it is not going to be used for a
long time:
1Perform the FAN operation for 3 or 4 hours
to dry the inside of the air conditioner.
•To perform FAN operation, set the remote controller to
the highest temperature in the MANUAL COOL mode.
(Refer to page 8.)
2Turn off the breaker.
CAUTION
Turn off the breaker when the air conditioner is not
going to be used for a long time.
Dirt may collect and this may cause a fire.
3Remove the batteries from the remote con-
troller.
CAUTION
To prevent liquid leakage, take out all batteries when
the remote controller is not going to be used for a
long time.
When the air conditioner is to be
used again:
1Clean the air filter and install it in the in-
door unit.
(Refer to page 11 for cleaning instructions.)
2Check that the air inlet and outlet of the
indoor/outdoor units are not blocked.
3Check that the ground is connected correctly.
CAUTION
Ground the unit.
Do not connect the ground to a gas pipe, water pipe,
lightning rod or the ground of a telephone. If the ground-
ing is incorrect, it may cause an electric shock.
TIMER
NOTE
If the main power is turned off or a power failure occurs
while AUTO START/STOP timer is active, the timer setting
is cancelled. As these models are equipped with an auto
restart function, the air conditioner should start operating
at the same time that power is restored.
Manual “Cool”
operation

10
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
MODE
STOP
START
HR.
MIN.
I FEEL COOL
DRY
AMPM
CLOCK
˚C
AMPM
HEAT
RESET CLOCK
WHEN THE AIR CONDITIONER IS NOT GOING
TO BE USED FOR A LONG TIME
Clean the
filter before
installing.
TIMER OPERATION (ON/OFFTIMER)
It is convenient to set the timer when you go to
bed, when you get home, when you get up, etc.
How to set the ON timer
1Press the
START
button during operation.
Each time the button is pressed, the ON timer mode
alternates between ON and OFF.
2Set the time of the timer using the
HR.
and
MIN.
buttons.
Each time the
HR.
button is pressed, the set time in-
creases by 1 hour; each time the
MIN.
button is
pressed, the set time increases by 10 minutes.
To release the ON timer:
■Press the
START
button.
How to set the OFF timer
1Press the
STOP
button during operation.
Each time the button is pressed, the OFF timer mode
alternates between ON and OFF.
2Set the time of the timer using the
HR.
and
MIN.
buttons.
Each time the
HR.
button is pressed, the set time in-
creases by 1 hour; each time the
MIN.
button is
pressed, the set time increases by 10 minutes.
To release the OFF timer:
■Press the
STOP
button.
Programming timer operation
The ON timer and the OFF timer can be used in combination.
The timer of the set time that is reached first will operate first.
(“”mark indicates the order of timer operations.)
■If the current time has not been set, the timer operation can-
not be used.
When it is not going to be used for a
long time:
1Perform the FAN operation for 3 or 4 hours
to dry the inside of the air conditioner.
•To perform FAN operation, set the remote controller to
the highest temperature in the MANUAL COOL mode.
(Refer to page 8.)
2Turn off the breaker.
CAUTION
Turn off the breaker when the air conditioner is not
going to be used for a long time.
Dirt may collect and this may cause a fire.
3Remove the batteries from the remote con-
troller.
CAUTION
To prevent liquid leakage, take out all batteries when
the remote controller is not going to be used for a
long time.
When the air conditioner is to be
used again:
1Clean the air filter and install it in the in-
door unit.
(Refer to page 11 for cleaning instructions.)
2Check that the air inlet and outlet of the
indoor/outdoor units are not blocked.
3Check that the ground is connected correctly.
CAUTION
Ground the unit.
Do not connect the ground to a gas pipe, water pipe,
lightning rod or the ground of a telephone. If the ground-
ing is incorrect, it may cause an electric shock.
TIMER
NOTE
If the main power is turned off or a power failure occurs
while AUTO START/STOP timer is active, the timer setting
is cancelled. As these models are equipped with an auto
restart function, the air conditioner should start operating
at the same time that power is restored.
Manual “Cool”
operation