Fujitsu AOT20AN User manual

ROOM AIR CONDITIONER
WALL MOUNTED TYPE
OPERATING MANUAL
P/N9360503022
Indoor Unit
AST20AG
AST20RG
AST24AG
AST24RG
AST30AG
AST30RG
Outdoor Unit
AOT20AN
AOT20RN
AOT24AN
AOT24RN
AOT30AB
AOT30RB
KEEP THIS OPERATION MANUAL
FOR FUTURE REFERENCE
FUJITSU GENERAL LIMITED

2
CONTENTS
SAFETY PRECAUTIONS .......................................... 2
FEATURES AND FUNCTIONS ................................. 3
NAME OF PARTS ...................................................... 4
PREPARATION .......................................................... 6
OPERATION .............................................................. 7
TIMER OPERATION .................................................. 9
SLEEP TIMER OPERATION .................................... 10
ADJUSTING THE DIRECTION OF
AIR CIRCULATION .................................................. 11
SWING OPERATION ............................................ 12
ENERGY SAVE OPERATION ............................... 13
MANUAL AUTO OPERATION ............................. 13
CLEANING AND CARE ........................................ 14
TROUBLESHOOTING .......................................... 15
OPERATING TIPS................................................. 16
●Do not attempt to install this air conditioner by yourself.
●This unit contains no user-serviceable parts. Always consult authorized service per-
sonnel for repairs.
●When moving, consult authorized service personnel for disconnection and installa-
tion of the unit.
●Do not become excessively chilled by staying for lengthy periods in the direct cooling
airflow.
●Do not insert fingers or objects into the outlet port or intake grilles.
●Do not start and stop air conditioner operation by disconnecting the power supply
cord and so on.
●Take care not to damage the power supply cord.
●In the event of a malfunction (burning smell, etc.), immediately stop operation, turn
off the circuit breaker, and consult authorized service personnel.
●Provide occasional ventilation during use.
●Do not direct air flow at fireplaces or heating apparatus.
●Do not climb on, or place objects on, the air conditioner.
●Do not hang objects from the indoor unit.
●Do not set flower vases or water containers on top of air conditioners.
●Do not expose the air conditioner directly to water.
●Do not operate the air conditioner with wet hands.
●Do not pull power supply cord.
●Turn off power source when not using the unit for extended periods.
●Check the condition of the installation stand for damage.
●Do not place animals or plants in the direct path of the air flow.
●Do not drink the water drained from the air conditioner.
●Do not use in applications involving the storage of foods, plants or animals, precision
equipment, or art works.
●Do not apply any heavy pressure to radiator fins.
●Operate only with air filters installed.
●Do not block or cover the intake grille and outlet port.
●Ensure that any electronic equipment is at least one metre away from either the in-
door or outdoor units.
●Avoid installing the air conditioner near a fireplace or other heating apparatus.
●When installing the indoor and outdoor unit, take precautions to prevent access to
infants.
●Do not use inflammable gases near the air conditioner.
SAFETY PRECAUTIONS
DANGER!
CAUTION!
WARNING!
CAUTION!
This mark indicates procedures which, if improperly performed, are most likely to
result in the death of or serious injury to the user or service personnel.
This mark indicates procedures which, if improperly performed, might lead to the
death or serious injury of the user.
This mark indicates procedures which, if improperly performed, might possibly result
in personal harm to the user, or damage to property.
DANGER!
●Before using the appliance, read these “PRECAUTIONS” thoroughly and operate in the correct way.
●The instructions in this section all relate to safety; be sure to maintain save operating conditions.
●“DANGER”, “WARNING” and “CAUTION” have the following meanings in these instructions:

3
FEATURES AND FUNCTIONS
AUTOMATIC OPERATION
●COOLING MODEL
Merely press the START/STOP button, and the unit will
begin automatic operation in the Cooling or Dry mode as
appropriate, in accordance with the thermostat setting
and the actual temperature of the room.
●HEAT & COOL MODEL (REVERSE CYCLE)
Merely press the START/STOP button, and the unit will
begin automatic operation in either the Heating, Cooling
or Monitor modes as appropriate, in accordance with the
thermostat setting and the actual temperature of the
room.
SLEEP TIMER
●COOLING MODEL
When the SLEEP timer button is pressed during Cooling
or Dry mode, the thermostat setting is gradually raised
during the period of operation. When the set time is
reached, the unit automatically turns off.
●HEAT & COOL MODEL (REVERSE CYCLE)
When the SLEEP timer button is pressed during Heating
mode, the air conditioner’s thermostat setting is gradu-
ally lowered during the period of operation; during Cool-
ing or Dry mode, the thermostat setting is gradually raised
during the period of operation. When the set time is
reached, the unit automatically turns off.
WIRELESS REMOTE CONTROL UNIT
The WIRELESS REMOTE CONTROL UNIT allows convenient
control of air conditioner operation.
OMNI-DIRECTIONAL AIR FLOW
(SWING OPERATION)
Three-dimensional control over air direction swing is possi-
ble through dual use of both an UP/DOWN air direction swing
and RIGHT/LEFT air direction swing. Since UP/DOWN air
direction flaps operate automatically according to the oper-
ating mode of the unit, it is possible to set air direction based
on the operating mode.
REMOVABLE INTAKE GRILLE
The indoor unit’s INTAKE GRILLE can be removed for easy
cleaning and maintenance.
MILDEW-RESISTANT FILTER
The AIR FILTER has been treated to resist mildew growth,
thus allowing cleaner use and easier care.
AIR CLEANING FILTER (Optional)
The optional air cleaning filter uses an electrostatic princi-
ple to clean the air of fine particulate matter such as tobacco
smoke and plant pollen.

4
Instructions relating to heating (*) are applicable only to “HEAT & COOL MODEL”(Reverse Cycle).
NAME OF PARTS
SLEEP TIMER
SET
TIME
SET
TEMP
MASTER
CONTROL
FAN
CONTROL
START
STOP
.
SET
ENERGY
SAVE
TIME
ADJUST
TEST
RUN ACL
SET
SWING SWING
CLOCK
OFF ON TIMER RESET
TIMER SLEEP
HM OFF
AUTO
COOL
DRY
FAN
ENERGY SAVE
HEAT
ON
A
AUTO
HIGH
MED
LOW
H
K
L
M
N
O
W
Z
[
\
]
^
X
Y
P
Q
R
S
T
U
I
J
V
CLOCK
COOL
AUTO
*
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 1
Fig. 8
Fig. 7

5
Fig. 1 Indoor Unit
1Operating Control Panel (Fig. 2)
2MANUAL AUTO button
3Remote Control Signal Receiver
4Indicator Lamps (Fig. 3)
5OPERATION Indicator Lamp (red)
6TIMER Indicator Lamp (green)
7SWING Indicator Lamp (orange)
(VERTICAL SWING)
8SWING Indicator lamp (orange)
(HORIZONTAL SWING)
●If the TIMER indicator lamp flashes when
the timer is operating, it indicates that a
fault has occurred with the timer setting
(See page 16 Auto Restart).
Intake Grille (Fig. 4)
0Air Filter
AUP/DOWN Air Direction Flaps
BRIGHT/LEFT Air Direction Louvers
(behind UP/DOWN Air Direction Flaps)
CDrain Hose
DAir Cleaning Filter (optional)
Fig. 5 Outdoor Unit
EIntake Port
FOutlet Port
GPipe Unit
Fig. 6 Remote Control Unit
HSLEEP Button
IMASTER CONTROL Button
JSET TEMP./SET TIME Buttons ( )
KSignal Transmitter
LTIMER Button
MFAN CONTROL Button
NSTART/STOP Button
OBattery compartment lid
Inside of the battery compartment lid (Fig. 7)
PAIR FLOW DIRECTION Button
QENERGY SAVE Button
RCODE CHANGE (Slide Switch)
Switching the remote control unit code.
(Max. 4 units)
STIME ADJUST Button
TTEST RUN Button
●This button is used when installing the air
conditioner and should not be used under
normal conditions as it will cause the air
conditioner’s thermostat function to oper-
ate incorrectly.
●If this button is pressed during normal op-
eration, the unit will switch to test opera-
tion mode, and the indoor unit’s OPERA-
TION indicator lamp and TIMER indicator
lamp will begin to flash simultaneously.
●To stop the test operation mode, either
press the TEST RUN button once again, or
press the START/STOP button to stop the
air conditioner.
UACL Button
VRemote Control Unit Display (Fig. 8)
WTransmit Indicator
XClock Display
YOperating Mode Display
ZTimer Mode Display
[Fan Speed Display
\Temperature Set Display
]Timer Set Indicator
`Temperature Set Indicator

6
PREPARATION
CAUTION!
●Take care to prevent infants from
accidentally swallowing batteries.
●When not using the remote control unit
for an extended period, remove the
batteries to avoid possible leakage and
damage to the unit.
●If leaking battery fluid comes in contact
with your skin, eyes, or mouth, immedi-
ately wash with copious amounts of
water, and consult your physician.
●Dead batteries should be removed
immediately and disposed of properly,
either in a battery collection receptacle
or to the appropriate authority.
●Do not attempt to recharge dry batteries.
Never mix new and used batteries, or
batteries of different types.
Batteries should last about one year
under normal use. If the remote control
unit’s operating range becomes appre-
ciably reduced, replace the batteries and
press the ACL button with the tip of a
ballpoint pen or other small object.
Turn on the Power
Connect the power supply plug to an electrical outlet; in the
case of a direct line connection, turn on the circuit breaker.
Load Batteries (R03/LR03 ××
××
×4)
1Slide the battery compartment lid to open it.
2Insert batteries.
Be sure to align the battery polarities ( ) correctly.
3Close the battery compartment lid.
Set the Current time
1Press the TIME ADJUST button.
Use the tip of a ball-point pen or other small object to press the button.
2Use the ( )SET TIME buttons to adjust the clock to
the current time.
button: Press to advance the time.
button: Press to reverse the time.
(Each time the buttons are pressed, the time will be advanced/reversed in
one-minute increments; hold the buttons depressed to change the time
quickly in ten-minute increments.)
3Press the TIME ADJUST button again.
This completes the time setting and starts the clock.
To Use the Remote Control Unit
●The remote control unit must be pointed at signal receiver to operate correctly.
●Operating range: About 7 meters.
●When a signal is properly received by the air conditioner, a beeping sound will
be heard.
●If no beep is heard, press the remote control unit button again.
Remote Control Unit Holder
For use as Handy Type
Screws
1Mount the Holder.
For use as Wall Fixing Type
1Mount the Holder.
Screws
2Set the Remote
Control Unit.
Insert Slide up
3To remove the
Remote Control
Unit (when use at
hand).
Insert
2Set the Remote
Control Unit.
3Attach the unit to
the holder as
shown.
Screw
Slide
SET
ENERGY
SAVE
TIME
ADJUST
TEST
RUN ACL
SET
SWING SWING

7
OPERATION
d
ccc
d
cccc
SLEEP TIMER
SET
TIME
SET
TEMP
MASTER
CONTROL
FAN
CONTROL
START
STOP
.
COOL
SLEEP TIMER
SET
TIME
SET
TEMP
MASTER
CONTROL
FAN
CONTROL
START
STOP
.
SLEEP TIMER
SET
TIME
SET
TEMP
MASTER
CONTROL
FAN
CONTROL
START
STOP
.
AUTO
Instructions relating to heating (*) are applicable only to “HEAT & COOL MODEL”(Reverse Cycle).
To Select Mode Operation
1Press the START/STOP button.
The indoor unit’s OPERATION indicator lamp (red) will light.
The air conditioner will start operating.
2Press the MASTER CONTROL button to select the de-
sired mode.
Each time the button is pressed, the mode will change in the following
order.
AUTO COOL DRY
*HEAT FAN
About three seconds later, the entire display will reappear.
To Set the Thermostat
Press the SET TEMP. buttons.
button: Press to raise the thermostat setting.
button: Press to lower the thermostat setting.
●Thermostat setting range:
AUTO .................................. 18 to 30 °C
* Heating ............................... 16 to 30 °C
Cooling/Dry ........................ 18 to 30 °C
The thermostat cannot be used to set room temperature during the FAN mode (the
temperature will not appear on the remote control unit’s display).
About three seconds later, the entire display will reappear.
The thermostat setting should be considered a standard value, and may differ
somewhat from the actual room temperature.
To Set the Fan Speed
Press the FAN CONTROL button.
Each time the button is pressed, the fan speed changes in the following order:
AUTO HIGH MED LOW
About three seconds later, the entire display will reappear.
When set to AUTO:
* Heating : Fan operates so as to optimally circulate warmed air.
However, the fan will operate at very low speed when the temperature
of the air issued from the indoor unit is low.
Cooling : As the room temperature approaches that of the thermostat setting,
the fan speed becomes slower.
Fan : The fan alternately turns on and off; when on, the fan runs at the low
fan speed.
The fan will operate at a very low setting during Monitor operation
and at the start of the Heating mode.
To Stop Operation
Press the START/STOP button.
The OPERATION indicator lamp (red) will go out.
Example: When set to COOL
Example: When set to 26 °C
Example: When set to AUTO

8
OPERATION
Setting temperature
Thermostat control
Dry Operation
Cooling Operation
Instructions relating to heating (*) are applicable only to “HEAT & COOL MODEL”(Reverse Cycle).
About Mode Operation
AUTO:
COOLING MODEL
●When the room temperature is 2 °C
higher than the set temperature, the
mode will switch between Cooling and
Drying.
●During the Drying mode operation, the
FAN setting should be switched to LOW
for a gently cooling effect during which
the fan may temporarily stop rotating.
●If the mode automatically selected by the
unit is not satisfactory, see page 7 for in-
structions on changing the mode setting
(COOL, DRY, FAN).
AUTO (* AUTO CHANGEOVER):
HEAT & COOL MODEL (Reverse cycle)
●When AUTO CHANGEOVER is selected, the air conditioner selects the appropri-
ate operation mode (Cooling or Heating) according to your room’s present tem-
perature.
●When AUTO CHANGEOVER is first selected, the fan will operate at very low speed
for about one minute while the unit determines the current conditions of the
room and accordingly selects the proper operation mode.
●When the air conditioner has adjusted your room’s temperature to near the ther-
mostat setting, it will begin monitor operation. In the monitor operation mode,
the fan will operate at low speed. If the room temperature subsequently changes,
the air conditioner will once again select the appropriate operation (Heating, Cool-
ing) to adjust the temperature to the value set in the thermostat. (The monitor
operation range is ±2 °C relative to the thermostat setting.)
●If the mode automatically selected by the unit is not satisfactory, see page 7 for
instructions on changing the mode setting (HEAT, COOL, DRY, FAN).
*Heating:
●Use to warm your room.
●When Heating mode is selected, the air conditioner will operate at very low fan
speed for about 3 to 5 minutes, after which it will switch to the selected fan set-
ting. This period of time is provided to allow the indoor unit to warm up before
begin full operation.
●When the room temperature is very low, frost may form on the outside unit, and
its performance may be reduced. In order to remove such frost, the unit will
automatically enter the defrost cycle from time to time. During Automatic De-
frosting operation, the OPERATION indicator lamp (red) will flash, and the heat
operation will be interrupted.
Cooling:
●Use to cool your room.
Dry:
●Use for gently cooling while dehumidifying your room.
●You cannot heat the room during Dry mode.
●During Dry mode, the unit will operate at low speed; in order to adjust room
humidity, the indoor unit’s fan may stop from time to time. Also, the fan may
operate at very low speed when detecting room humidity.
●Then fan speed cannot be changed manually when Dry mode has been selected.
Fan:
●Use to circulate the air throughout your room.
* During Heating mode:
Set the thermostat to a temperature set-
ting that is higher than the current room
temperature. The Heating mode will not
operate if the thermostat is set lower than
the actual room temperature.
During Cooling/Dry mode:
Set the thermostat to a temperature set-
ting that is lower than the current room
temperature. The Cooling and Dry modes
will not operate if the thermostat is set
higher than the actual room temperature
(in Cooling mode, the fan alone will oper-
ate).
During Fan mode:
The heat and cool functions of this unit
cannot operate at the same time.
2 °C

9
TIMER OPERATION
ccc
d
SLEEP TIMER
SET
TIME
SET
TEMP
MASTER
CONTROL
FAN
CONTROL
.
TIMER
ON
SLEEP TIMER
SET
TIME
SET
TEMP
MASTER
CONTROL
FAN
CONTROL
.
TIMER
ON
Instructions relating to heating (*) are applicable only to “HEAT & COOL MODEL”(Reverse Cycle).
Before using the timer function, be sure that the remote control unit is set to the correct current time (See page 6).
To Use the ON timer or OFF timer
1Press the START/STOP button
(if the unit is already operating, proceed to step 2).
The indoor unit’s OPERATION indicator lamp (red) will light.
2Press the TIMER button to select the OFF timer or ON
timer operation.
Each time the button is pressed the timer function changes in the follow-
ing order:
RESET OFF ON
PROGRAM(OFF →ON, OFF ←ON)
The indoor unit’s TIMER indicator lamp (green) will light.
3Use the SET TIME buttons to adjust the desired OFF
time or ON time.
Set the time while the time display is flashing (the flashing will continue
for about five seconds).
button: Press to advance the time.
button: Press to reverse the time.
About five seconds later, the entire display will reappear.
To Use the PROGRAM timer
1Press the START/STOP button
(if the unit is already operating, proceed to step 2).
The indoor unit’s OPERATION indicator lamp (red) will light.
2Set the desired times for OFF timer and ON timer.
See the section “To Use the ON timer or OFF timer”to set the desired
mode and times.
About three seconds later, the entire display will reappear.
The indoor unit’s TIMER indicator lamp (green) will light.
3Press the TIMER button to select the PROGRAM timer
operation (either OFF →ON or OFF ←ON will display).
The display will alternately show “OFF timer”and “ON timer”, then change
to show the time setting for the operation to occur first.
●The PROGRAM timer will begin operation. (If the ON timer has been
selected to operate first, the unit will stop operating at this point.)
About five seconds later, the entire display will reappear.
To Cancel the Timer
Use the TIMER button to select “TIMER
RESET.”
The air conditioner will return to normal
operation.
To Change the Timer Settings
Perform steps 2and 3.
To Stop Air Conditioner Operation
while the Timer is Operating
Press the START/STOP button.
To Change Operating Conditions
If you wish to change the operating
conditions (Mode, Fan Speed, Thermostat
Setting), after making the timer setting,
wait until the entire display reappears, then
press the appropriate buttons to change to
the desired operating condition.
To Cancel the Timer
Use the TIMER button to select “TIMER
RESET.”
The air conditioner will return to normal
operation.
To Change the Timer Settings
1. Follow the instructions given in the section
“To Use the ON Timer or OFF Timer”to se-
lect the timer setting you wish to change.
2. Press the TIMER button to select either
OFF →ON or OFF ←ON.
To Stop Air Conditioner Operation
while the Timer is Operating
Press the START/STOP button.
To Change Operating Conditions
If you wish to change the operating
conditions (Mode, Fan Speed, Thermostat
Setting), after making the timer setting,
wait until the entire display reappears, then
press the appropriate buttons to change to
the desired operating condition.

10
TIMER OPERATION
SLEEP TIMER OPERATION
30
minutes
1 hour
1 hour
30 minutes
Set time
Set time
1 hour
1 °C2 °C
SLEEP TIMER
SET
TIME
SET
TEMP
MASTER
CONTROL
FAN
CONTROL
.
SLEEP
COOL
About the PROGRAM timer
●The PROGRAM timer allows you to integrate OFF timer
and ON timer operations in a single sequence. The se-
quence can involve one transition from OFF timer to ON
timer, or from ON timer to OFF timer, within a twenty-
four hour period.
●The first timer function to operate will be the one set near-
est to the current time. The order of operation is indi-
cated by the arrow in the remote control unit’s display
(OFF →ON, or OFF ←ON).
●One example of PROGRAM timer use might be to have
the air conditioner automatically stop (OFF timer) after
you go to sleep, then start (ON timer) automatically in
the morning before you rise.
About the ON timer
●The timer function is designed to bring your room to a
comfortable temperature by the set time; as a result, the
unit automatically begins operation before the set time
so that the room reaches the desired temperature by the
time set on the timer (“Nice-Morning Timer”).
●The hotter it is in summer, or the colder it is in winter, the
earlier that operation will begin.
* During Heating Operation ....... from 45 to 10 minutes be-
fore set time.
During Cooling/Dry Operation ... from 20 to 10 minutes be-
fore set time.
During Fan Operation .............. at the set time.
Instructions relating to heating (*) are applicable only to “HEAT & COOL MODEL”(Reverse Cycle).
Unlike other timer functions, the SLEEP timer is designed to set the duration of time in which the unit does not operate.
To Use the SLEEP timer
While the air conditioner is operating or stopped, press the
SLEEP button.
Both the indoor unit’s OPERATION indicator lamp (red) and the TIMER indicator
lamp (green) will light.
To Change the Timer Settings
Press the SLEEP button once again and set the time using the
SET TIME buttons.
Set the time while the Timer Mode Display is flashing (the flashing will continue for
about five seconds).
button: Press to advance the time.
button: Press to reverse the time.
About five seconds later, the entire display will reappear.
To Cancel the Timer:
Use the TIMER button to select “TIMER
RESET”.
The air conditioner will return to normal
operation.
To Stop the Air Conditioner During
Timer Operation:
Press the START/STOP button.
About the SLEEP timer
To prevent excessive warming or cooling during sleep, the SLEEP timer function automatically modifies the thermostat setting
in accordance with the time setting. When the set time has elapsed, the air conditioner completely stops.
*During Heating operation:
When the SLEEP timer is set, the thermostat setting is
automatically lowered 1 °C every thirty minutes. When the
thermostat has been lowered a total of 4 °C, the thermostat
setting at that time is maintained until the set time has elapsed,
at which time the air conditioner automatically turns off.
SLEEP timer setting
During Cooling/Dry operation:
When the SLEEP timer is set, the thermostat setting is auto-
matically raised 1 °C every sixty minutes. When the thermo-
stat has been raised a total of 2 °C, the thermostat setting at
that time is maintained until the set time has elapsed, at which
time the air conditioner automatically turns off.
SLEEP timer setting
1 °C2 °C3 °C4 °C

11
ADJUSTING THE DIRECTION OF AIR CIRCULATION
Instructions relating to heating (*) are applicable only to “HEAT & COOL MODEL”(Reverse Cycle).
Vertical (up-down) direction of airflow is adjusted by pressing the remote control unit’s AIR FLOW DIRECTION VERTICAL SET
button. Horizontal (right-left) direction of airflow is adjusted by pressing the remote control unit’s AIR FLOW DIRECTION
HORIZONTAL SET button.
DANGER!
Never place fingers or foreign objects inside
the outlet ports, since the internal fan oper-
ates at high speed and could cause personal
injury.
●Always use the remote control unit’s
AIR FLOW DIRECTION button to adjust
the UP/DOWN air direction flaps or
RIGHT/LEFT air direction louvers. At-
tempting to move them manually
could result in improper operation; in
this case, stop operation and restart.
The louvers should begin to operate
properly again.
●During use of the Cooling and Dry
modes, do not set the UP/DOWN air
direction flaps in the Heating range (5
to 7) for long periods of time, since
water vapor may condense near the
outlet louvers and drops of water may
drip from the air conditioner.
●When used in a room with infants, chil-
dren, elderly or sick persons, the air
direction and room temperature
should be considered carefully when
making settings.
Example: When set to vertical air direc-
tion
Example: When set to horizontal air di-
rection
Vertical Air Direction Adjustment
Press the AIR FLOW DIRECTION VERTICAL SET button.
Each time the button is pressed, the air direction range will change as follows:
1234567
Types of Air flow Direction Setting:
1,2,3,4: During Cooling/Dry Modes
5,6,7: * During Heating mode
The remote control unit’s display does
not change.
Fig. 9
●Use the air direction adjustments within the ranges shown above.
●The vertical airflow direction is set automatically as shown, in accordance with
the type of operation selected.
During Cooling/Dry mode : Horizontal flow 1
* During Heating mode : Downward flow 7
●During AUTO mode operation, for the first minute after beginning operation,
airflow will be horizontal 1; the air direction cannot be adjusted during this pe-
riod.
Horizontal Air Direction Adjustment
Press the AIR FLOW DIRECTION HORIZONTAL SET button.
Each time the button is pressed, the air direction range will change as follows:
12345
The remote control unit’s display does
not change.
●Use the air direction adjustments within the ranges shown above.
Fig. 10
RIGHT/LEFT air direction louvers
SET
ENAGY
SAVE
TIME
ADJUST
TEST
RUN ACL
SET
SWING SWING
SET
ENERGY
SAVE
TIME
ADJUST
TEST
RUN ACL
SET
SWING SWING

12
SWING OPERATION
Begin air conditioner operation before performing this procedure.
To select Vertical airflow SWING Operation
Press the AIR FLOW DIRECTION VERTICAL SWING button .
The SWING indicator lamp (VERTICAL SWING) (orange) will light.
In this mode, the UP/DOWN air direction flaps will swing automatically to direct the
air flow both up and down.
To Stop Vertical airflow SWING Operation
Press the AIR FLOW DIRECTION VERTICAL SWING button
once again.
The SWING indicator lamp (VERTICAL SWING) will go out.
Airflow direction will return to the setting before swing was begun.
Example: When set to vertical swing
SET
ENERGY
SAVE
TIME
ADJUST
TEST
RUN ACL
SET
SWING SWING
About Swing Operation
●The range of swing is relative to the currently set airflow
direction.
Air direction range (See page 11, Fig. 9)
●If the swing range is not as desired, use the remote con-
trol unit’s AIR FLOW DIRECTION VERTICAL SET button to
change the range of swing.
●The SWING operation may stop temporarily when the air
conditioner’s fan is not operating, or when operating at
very low speeds.
●During use of the Cooling and Dry modes, do not set the
air UP/DOWN direction flaps, in the Heating range (5to
7) for long periods of time, since water vapor may con-
dense near the outlet louvers and drops of water may
drip from the air conditioner.
To select Horizontal airflow SWING Operation
Press the AIR FLOW DIRECTION HORIZONTAL SWING button.
The SWING indicator lamp (HORIZONTAL SWING) (orange) will light.
In this mode, the RIGHT/LEFT air direction louvers will swing automatically to direct
the airflow both right and left.
To Stop Horizontal airflow SWING Operation
Press the AIR FLOW DIRECTION HORIZONTAL SWING button
once again.
The SWING indicator lamp (HORIZONTAL SWING) will go out.
Airflow direction will return to the setting before swing was begun.
Example: When set to horizontal swing
Air flow direction set
1
2
3
4
5
6
7
Range of swing
1to 3
1to 4
2to 5
3to 6
4to 7
5to 7
1to 7(All range)
SET
ENERGY
SAVE
TIME
ADJUST
TEST
RUN ACL
SET
SWING SWING
About Swing Operation
●If the swing range is not as desired, use the remote con-
trol unit’s AIR FLOW DIRECTION HORIZONTAL SET but-
ton to change the range of swing.
●The SWING operation may stop temporarily when the air
conditioner’s fan is not operating, or when operating at
very low speeds.
●The range of swing is relative to the currently set airflow
direction.
Air flow direction set
1
2
3
4
5
Range of swing
1to 5(All range)
1to 3
2to 4
3to 5
1to 5(All range)
Air direction range (See page 11, Fig. 10)

13
ENERGY SAVE OPERATION
Instructions relating to heating (*) are applicable only to “HEAT & COOL MODEL”(Reverse Cycle).
The air conditioner can be operated while keeping energy consumption costs down.
How To Use the ENERGY SAVE OPERATION
1Press the START/STOP button
(if the unit is already operating, proceed to step 2).
The indoor unit’s OPERATION indicator lamp (red) will light.
2Press the MASTER CONTROL button to select the
COOL, DRY, *HEAT mode.
3Press the ENERGY SAVE button.
ENERGY SAVE can only be used if the MASTER CONTROL button is used
to select the “COOL”, “DRY”or *“HEAT”.
The air conditioner saves energy costs by controlling the thermostat temperature setting.
*During Heating operation:
The thermostat temperature setting decreases by 1 °C as
soon as the ENERGY SAVE button is pressed, and then de-
creases by another 1 °C every thirty minutes.
Afterwards, energy consumption is saved by continuing to
heat at a thermostat temperature of 4 °C less than that set.
ENERGY SAVE setting
During Cooling/Dry operation:
The thermostat temperature setting increases by 1 °C as soon
as the ENERGY SAVE button is pressed, and then increases
by another 1 °C after one hour has passed.
Afterwards, energy consumption is saved by continuing to
cool or dry at a thermostat temperature of 2 °C more than
that set.
ENERGY SAVE setting
To Cancel the ENERGY SAVE:
Press the ENERGY SAVE button.
About the ENERGY SAVE
Set temperature
1 °C2 °C3 °C4 °C
30 minutes
ENERGY
SAVE ON
1 hour
1 hour 30 minutes
MANUAL AUTO OPERATION
Use the MANUAL AUTO operation in the event the remote control unit is lost or otherwise unavailable.
How To Use the Main Unit Controls
Press the MANUAL AUTO button on the main unit control
panel.
To stop operation, press the MANUAL AUTO button once again.
●When the air conditioner is operated
with the controls on the Main unit, it
will operate under the same mode as
the AUTO mode selected on the re-
mote control unit (see page 8).
●The fan speed selected will be “AUTO”
and the thermostat setting will be 23 °C.
SET
ENERGY
SAVE
TIME
ADJUST
TEST
RUN ACL
SET
SWING SWING
1 °C
2 °C
ENERGY
SAVE ON
1 hour
Set
temperature

14
●Before cleaning the air conditioner, be sure to turn it off and disconnect the power supply cord.
●Be sure the intake grille is installed securely.
●When removing and replacing the air filters, be sure not to touch the heat exchanger, as per-
sonal injury may result.
CLEANING AND CARE
CAUTION!
Cleaning the Intake Grille
1. Remove the intake grille
1Place your fingers at both lower ends of the grille
panel, and lift forward; if the intake grille seems to
catch partway through its movement, continue lifting
upward to remove.
2Lift up the intake grille fully to remove.
2. Clean with water.
Remove dust with a vacuum cleaner; wipe the unit with
warm water, then dry with a clean, soft cloth.
3. Replace the intake grille.
1Holding the intake grille horizontally, fasten the two
upper hooks on the unit.
2Press the intake grille down at the lower sides to close.
Cleaning the Air Filter
1. Open the intake grille, and remove the air
filter.
Lift up the air filter’s handle, disconnect the two lower
tabs, and pull out.
2. Remove dust with a vacuum cleaner or by
washing.
After washing, allow to dry thoroughly in a shaded place.
3. Replace the air filter and close the intake
grille.
1Align the sides of the air filter with the panel, and push
in fully, making sure the two lower tabs are returned
properly to their holes in the panel.
2Close the intake grille.
(For purposes of example, the illustration shows the unit
without intake grille installed.)
●Dust can be cleaned from the air filter either with a vacuum
cleaner, or by washing the filter in a solution of mild de-
tergent and warm water. If you wash the filter, be sure to
allow it to dry thoroughly in a shady place before rein-
stalling.
●If dirt is allowed to accumulate on the air filter, air flow
will be reduced, lowering operating efficiency and increas-
ing noise.
●During periods of normal use, the air filters should be
cleaned every two weeks.
When using the optional Air Cleaning Filter
●Install the optional air cleaning filter set as instructed (installation instructions are furnished with the air cleaning filter set).
●When used for extended periods, the unit may accumulate dirt inside, reducing its performance. We recommend that the
unit be inspected regularly, in addition to your own cleaning and care. For more information, consult authorized service
personnel.
●When cleaning the unit’s body, do not use water hotter than 40 °C, harsh abrasive cleansers, or volatile agents like
benzene or thinner.
●Do not expose the unit body to liquid insecticides or hairsprays.
●When shutting down the unit for one month or more, first allow the fan mode to operate continuously for about one-half
day to allow internal parts to dry thoroughly.
Intake Grille Air filter handle
Hooks (two places)
Intake Grille
Hooks (two places)

15
TROUBLESHOOTING
Instructions relating to heating (*) are applicable only to “HEAT & COOL MODEL”(Reverse Cycle).
In the event of a malfunction (burning smell, etc.), immediately stop operation, disconnect the
power supply plug, and consult authorized service personnel.
Merely turning off the unit’s power switch will not completely disconnect the unit from the power
source. Always be sure to disconnect the power supply plug or turn off your circuit breaker to
ensure that power is completely off.
Before requesting service, perform the following checks:
WARNING!
Symptom
Doesn’t operate immedi-
ately:
Noise is heard:
Smells:
Mist or steam are
emitted:
Airflow is weak or stops.
Water is produced from
the outdoor unit.
Problem
●If the unit is stopped and then immediately started again, the com-
pressor will not operate for about 3 minutes, in order to prevent
fuse blowouts.
●Whenever the power supply plug is disconnected and then re-
connected to a power outlet, the protection circuit will operate
for about 3 minutes, preventing unit operation during that pe-
riod.
●During operation and immediately after stopping the unit, the
sound of water flowing in the air conditioner’s piping may be
heard. Also, noise may be particularly noticeable for about 2 to 3
minutes after starting operation (sound of coolant flowing).
●During operation, a slight squeaking sound may be heard. This is
the result of minute expansion and contraction of the front cover
due to temperature changes.
*●During Heating operation, a sizzling sound may be heard occa-
sional. This sound is produced by the Automatic Defrosting op-
eration.
●Some smell may be emitted from the indoor unit. This smell is
the result of room smells (furniture, tobacco, etc.) which have
been taken into the air conditioner.
●During Cooling or Dry operation, a thin mist may be seen emitted
from the indoor unit. This results from the sudden Cooling of
room air by the air emitted from the air conditioner, resulting in
condensation and misting.
*●During Heating operation, the outdoor unit’s fan may stop, and
steam may be seen rising from the unit. This is due to Automatic
Defrosting operation.
*●When Heating operation is started, fan speed is temporarily very
low, to allow internal parts to warm up.
*●During Heating operation, if the room temperature rises above
the thermostat setting, the outdoor unit will stop, and the indoor
unit will operate at very low fan speed. If you wish to warm the
room further, set the thermostat for a higher setting.
*●During Heating operation, the unit will temporarily stop opera-
tion (between 7 and 15 minutes) as the Automatic Defrosting mode
operates. During Automatic Defrosting operation, the OPERATION
indicator lamp will flash.
●The fan may operate at very low speed during Dry operation or
when the unit is monitoring the room’s temperature.
●In the monitor AUTO operation, the fan will operate at very low
speed.
*●During Heating operation, water may be produced from the out-
door unit due to Automatic Defrosting operation.
See Page
—
—
16
—
—
16
—
16
7
7
16
NORMAL
FUNCTION

16
TROUBLESHOOTING
Instructions relating to heating (*) are applicable only to “HEAT & COOL MODEL”(Reverse Cycle).
Symptom
Doesn’t operate at all:
Poor Cooling
(or *Heating)
performance:
The unit operates
differently from the
remote control unit’s
setting:
See Page
—
9 to 10
—
6
CHECK ONCE
MORE
Items to check
●Is the power supply plug disconnected from its outlet?
●Has there been a power failure?
●Has a fuse blown out, or a circuit breaker been tripped?
●Is the timer operating?
●Is the air filter dirty?
●Are the air conditioner’s intake grille or outlet port blocked?
●Did you adjust the room temperature settings (thermostat) cor-
rectly?
●Is there a window or door open?
●In the case of Cooling operation, is a window allowing bright sun-
light to enter? (Close the curtains.)
●In the case of Cooling operation, are there heating apparatus and
computers inside the room, or are there too many people in the
room?
●Are the remote control unit’s batteries dead?
●Are the remote control unit’s batteries loaded properly?
If the problem persists after performing these checks, or if you notice burning smells, or the TIMER indicator lamp flashes,
immediately stop operation, disconnect the power supply plug, and consult authorized service personnel.
OPERATING TIPS
*Heating Performance
●This air conditioner operates on the heat-pump principle,
absorbing heat from outdoor air and transferring that heat
indoors. As a result, the operating performance is reduced
as outdoor air temperature drops. If you feel that insuffi-
cient heating performance is being produced, we recom-
mend you use this air conditioner in conjunction with
another kind of heating appliance.
●Heat-pump air conditioners heat your entire room by
recirculating air throughout the room, with the result that
some time may be required after first starting the air con-
ditioner until the room is heated.
*Microcomputer-controlled Automatic Defrosting
●When using the Heating mode under conditions of low
outdoor air temperature high humidity, frost may form
on the outdoor unit, resulting in reduced operating per-
formance.
In order to prevent this kind of reduced performance, this
unit is equipped with a Microcomputer-controlled Auto-
matic Defrosting function. If frost forms, the air condi-
tioner will temporarily stop, and the defrosting circuit will
operate briefly (for about 7 to 15 minutes).
During Automatic Defrosting operation, the OPERATION
indicator lamp (red) will flash.
Operation and Performance
●The air conditioner power has been interrupted by a
power failure. The air conditioner will then restart auto-
matically in its previous mode when the power is restored.
●If a power failure occurs during TIMER operation, the timer
will be reset and the unit will begin (or stop) operation at
the new time setting. In the event that this (kind of timer
fault occurs the TIMER indicator lamp (green) will flash
(see page. 5) ).
●Use of other electrical appliances (electric shaver, etc.) or
nearby use of a wireless radio transmitter may cause the
air conditioner to malfunction. In this event, temporarily
disconnect the power supply plug, reconnect it, and then
use the remote control unit to resume operation.
AUTO Restart
In Event of Power Interruption

17
OPERATING TIPS
Instructions relating to heating (*) are applicable only to “HEAT & COOL MODEL”(Reverse Cycle).
Temperature and Humidity Range
Cooling/Dry Mode
About 21 to 46 °C
(AST20AG, AST24AG Models)
About 0 to 52 °C
(AST30AG Model)
About 0 to 46 °C
(AST20RG, AST24RG Models)
About 0 to 52 °C
(AST30RG Model)
About 18 to 32 °C
About 80 % or less
If the unit is used for long pe-
riods under high-humidity
conditions, condensation
may form on the surface of
the indoor unit, and drip onto
the floor or other objects un-
derneath.
*Heating Mode
—
About 0 to 21 °C
(AST20RG, AST24RG Models)
About –5 to 21 °C
(AST30RG Model)
About 30 °C or less
—
COOLING MODEL
HEAT & COOL MODEL
(Reverse Cycle)
Outdoor temperature
Indoor temperature
Indoor humidity
●If the air conditioner is used under higher temperature conditioner than those listed, the built-in protection circuit may
operate to prevent internal circuit damage. Also, during Cooling and Dry modes, if the unit is used under conditions of
lower temperature than those listed above, the heat-exchanger may freeze, leading to water leakage and other damage.
●Do not use this unit for any purposes other than the Cooling, (*)Heating, Dehumidifying, and air-circulation of rooms in
ordinary dwellings.