Fujitsu AST20AG User manual

ROOM AIR CONDITIONER
WALL MOUNTED TYPE
OPERATING MANUAL
P/N9360503015-02
Indoor Unit
AST20AG
AST20RG
AST24AG
AST24RG
AST30AG
AST30RG
Outdoor Unit
AOT20AZ
AOT20RZ
AOT24AB
AOT24RZ
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
●If the power supply cord of this air conditioner is damaged, it must be replaced by the
manufacturer or its authorized service personnel only in order to avoid a safety haz-
ard.
●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
CAUTION!
DANGER!
WARNING!

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
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
J
M
N
O
P
Q
Y
\
]
^
a
b
Z
[
R
S
T
U
V
W
K
L
X
CLOCK
COOL
AUTO
*
Instructions relating to heating(*) are applicable only to “HEAT & COOL MODEL” (Reverse Cycle).
NAME OF PARTS
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).
9Intake Grille (Fig. 4)
0Air Filter
AUP/DOWN Air Direction Flaps
BRIGHT/LEFT Air Direction Louvers
(behind UP/DOWN Air Direction Flaps)
CDrain Hose
DPower Supply Plug
EPower Supply Cord
FAir Cleaning Filter (optional)
Fig. 5 Outdoor Unit
GIntake Port
HOutlet Port
IPipe Unit
Fig. 6 Remote Control Unit
JSLEEP Button
KMASTER CONTROL Button
LSET TEMP./SET TIME Buttons ( )
MSignal Transmitter
NTIMER Button
OFAN CONTROL Button
PSTART/STOP Button
QBattery compartment lid
Inside of the battery compartment lid (Fig. 7)
RAIR FLOW DIRECTION Button
SENERGY SAVE Button
TCODE CHANGE (Slide Switch)
Switching the remote control unit code.
(Max. 4 units)
UTIME ADJUST Button
VTEST 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.
WACL Button
XRemote Control Unit Display (Fig. 8)
YTransmit Indicator
ZClock Display
[Operating Mode Display
\Timer Mode Display
]Fan Speed Display
`Temperature Set Display
aTimer Set Indicator
bTemperature 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
t
sss
t
ssss
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
2°C
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.

9
TIMER OPERATION
sss
t
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 2 and 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
2°C3°C4°C
30
minutes
1°C
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 ther-
mostat 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