Hitachi RAS-S18H2AA User manual

– 1 –
INDOOR UNIT
OUTDOOR UNIT
SPLIT TYPE AIR CONDITIONER
INDOOR UNIT/OUTDOOR UNIT
MODEL
RAS-S18H2AA
RAC-S18H2AA
T ORAR
S ITCH
RAS-S18H2AA/RAC-S18H2AA
(EN1) RAS-S18H2AA.indd 1 5/19/10 5:10 PM

– 2 –
!
●
Please read the “Safety Precaution” carefully before operating the unit to ensure correct usage of the unit.
●
Pay special attention to signs of “ Warning” and “ Caution”. The “Warning” section contains matters which,
if not observed strictly, may cause death or serious injury. The “Caution” section contains matters which may
result in serious consequences if not observed properly. Please observe all instructions strictly to ensure safety.
●
The sign indicate the following meanings.
●
Please keep this manual after reading.
WARNING
PRECAUTIONS DURING INSTALLATION
●
Do not reconstruct the unit.
Water leakage, fault, short circuit or re may occur if you reconstruct the unit by
yourself.
●
Please ask your sales agent or qualied technician for the installation of your unit.
Water leakage, short circuit or re may occur if you install the unit by yourself.
●
Please use earth line.
Do not place the earth line near water or gas pipes, lightning-conductor, or the
earth line of telephone. Improper installation of earth line may cause electric
shock.
●
Be sure to use the specied piping set for R410A. Otherwise, this may result in
broken copper pipes or faults.
●
A circuit breaker should be installed depending on the mounting site of the unit.
Without a circuit breaker, the danger of electric shock exists.
●
Do not install near location where there is ammable gas. The outdoor unit may
catch re if ammable gas leaks around it.
●
Please ensure smooth ow of water when installing the drain hose.
CAUTION
!
!
PRECAUTIONS DURING OPERATION
●Avoid an extended period of direct air ow for your health.
W
A
R
N
I
N
G
!
●Do not insert a nger, a rod or other objects into the air outlet or inlet. As the fan
is rotating at a high speed, it will cause injury. Before cleaning, be sure to stop
the operation and turn the breaker OFF.
●During thunder storm, disconnect and turn off the circuit breaker.
●Do not use any conductor as fuse wire, this could cause fatal accident.
!
Make sure to connect earth line.
Indicates the instructions that must be followed.
The sign in the gure indicates prohibition.
PRECAUTIONS DURING SHIFTING OR MAINTENANCE
●Should abnormal situation arises (like burning smell), please stop operating the unit
and turn off the circuit breaker. Contact your agent. Fault, short circuit or re may
occur if you continue to operate the unit under abnormal situation.
●Please contact your agent for maintenance. Improper self maintenance may cause
electric shock and re.
●Please contact your agent if you need to remove and reinstall the unit. Electric
shock or re may occur if you remove and reinstall the unit yourself improperly.
●If the supply cord is damaged, it must be replaced by the special cord
obtainable at authorized service/parts centers.
W
A
R
N
I
N
G
!
(EN2) RAS-S18H2AA (1642).indd 2 5/20/10 10:51 AM

– 3 –
PRECAUTIONS DURING OPERATION
●Do not attempt to operate the unit with wet hands, this could cause fatal
accident.
●When operating the unit with burning equipments, regularly ventilate the
room to avoid oxygen insufciency.
●Do not direct the cool air coming out from the air-conditioner panel to face
household heating apparatus as this may affect the working of apparatus
such as the electric kettle, oven etc.
●Do not use any aerosol or hair sprays near the indoor unit. This chemical
can adhere on heat exchanger n and blocked the evaporation water ow
to drain pan. The water will drop on tangential fan and cause water splashing
out from indoor unit.
●Please ensure that outdoor mounting frame is always stable, rm and
without defect. If not, the outdoor unit may collapse and cause danger.
●Do not splash or direct water to the body of the unit when cleaning it as
this may cause short circuit.
●When operating the unit with the door and windows opened, (the room humidity is always above
80%) and with the air deector facing down or moving automatically for a long period of time,
water will condense on the air deector and drips down occasionally. This will wet your furniture.
Therefore, do not operate under such condition for a long time.
●If the amount of heat in the room is above the cooling or heating capability of the unit (for
example: more people entering the room, using heating equipments and etc.), the preset room
temperature cannot be achieved.
●
This appliance is not intended for use by young children or inrm persons unless they have been
adequately supervised by a responsible person to ensure that they can use the appliance safely.
●Young children should be supervised to ensure that they do not play with the appliance.
●Do not climb on the outdoor unit or put objects on it.
●Please switch off the unit and turn off the circuit breaker during cleaning,
the high-speed fan inside the unit may cause danger.
●Turn off the circuit breaker if the unit is not to be operated for a long period.
C
A
U
T
I
O
N
!
●The product shall be operated under the manufacturer specication and
not for any other intended use.
●Do not put water container (like vase) on the indoor unit to avoid water
dripping into the unit. Dripping water will damage the insulator inside the
unit and causes short-circuit.
●Do not place plants directly under the air ow as it is bad for the plants.
(EN2) RAS-S18H2AA (1642).indd 3 5/20/10 10:51 AM

– 2 –
HITACHI
HITACH
I
INDOOR UNIT
NAMES AND FUNCTIONS OF EACH PART
Air lter
To prevent dust from coming into the indoor unit.
(Refer Instruction manual)
Front panel
Indoor unit indicators
Light indicator showing the operating condition.
(Refer page 3)
Horizontal deector ●Vertical deector
(Air Outlet)
Remote controller
Send out operation signal to the indoor unit. So as
to operate the whole unit.
(Refer Instruction manual)
WIDTH (mm)
780
850
MODEL
RAS-S18H2AA
RAC-S18H2AA
HEIGHT (mm)
280
650
DEPTH (mm)
220
298
MODEL NAME AND DIMENSIONS
OUTDOOR UNIT
DRAIN PIPE
Condensed water drain to outside.
CONNECTING CORD
AIR INLET (BACK, LEFT SIDE)
AIR OUTLET
●Air cleansing lters are washable and can be use in 1 year time. Type number for this air cleansing
lter is <SPX-CFH11>. Please use this number for ordering when you want to renew it.
●Air cleansing lter should be cleaned every month or sooner if noticeable loading occurs. When
used overtime, it may loose its deodorizing function. For maximum performance, it is recommended
to replace it every 1 year depending on application requirements.
NOTE
(EN1) RAS-S18H2AA.indd 2 5/19/10 5:10 PM

– 3 –
INDOOR UNIT INDICATORS
OPERATION INDICATOR
FILTER LAMP
When the device is operated for a total of about 200
hours, the FILTER lamp lights to indicate that it is
time to clean the lter. The lamp goes out when the
“ (AUTO SWING)” button is pressed while the
device is on “STANDBY MODE”.
OPERATION LAMP
This lamp lights during operation.
The OPERATION LAMP ashes in the following cases
during heating.
(1) During preheating
For about 2–3 minutes after starting up.
(2) During defrosting
Defrosting will be performed about once every one
hour when frost forms on the heat exchanger of the
outdoor unit, for 5–10 minutes each time.
TIMER LAMP
This lamp lights when the timer is working.
TEMPORARY SWITCH
Use this switch to start and stop when the remote controller does not work. [Use non-conductor stick
(example: toothpick)]
●By pressing the temporary switch, the operation is done in previously set operation mode.
●When the operation is done using the temporary switch after the power source is turned off and turn
on again, the operation is done in automatic mode.
(EN1) RAS-S18H2AA.indd 3 5/19/10 5:10 PM

– 4 –
NAMES AND FUNCTIONS OF REMOTE CONTROL UNIT
REMOTE CONTROLLER
●This controls the operation of the indoor unit. The range of control is about 7 meters. If indoor lighting is controlled
electronically, the range of control may be shorter.
This unit can be xed on a wall using the xture provided. Before xing it, make sure the indoor unit can be controlled
from the remote controller.
●Handle the remote controller with care. Dropping it or getting it wet may compromise its signal transmission capability.
●After new batteries are inserted into the remote controller, the unit will initially require approximately 10 seconds to
respond to commands and operate.
●Signal emitting window/transmission sign
Point this window toward the indoor unit when controlling it.
The transmission sign blinks when a signal is sent.
●Display
This indicates the room temperature selected, current time, timer status, function
and intensity of circulation selected.
●START/STOP button
Press this button to start operation. Press it again to stop operation.
●SLEEP button
Use this button to set the sleep timer.
●TEMPERATURE buttons
Use these buttons to raise or lower the temperature setting. (Keep pressed,
and the value will change more quickly.)
●TIME button
Use this button to set and check the time and date.
●RESET buttons
●FUNCTION selector
Use this button to select the operating mode. Every time you press it,
the mode will change from (AUTO) to (HEAT) to (DEHUMIDIFY) to
(COOL) and to (FAN) cyclically.
●FAN SPEED selector
This determines the fan speed. Every time you press this button, the intensity
of circulation will change from (AUTO) to (HI) to (MED) to (LOW)
to (SILENT) (This button allows selecting the optimal or preferred fan speed
for each operation mode).
●AUTO SWING button
Controls the angle of the horizontal air deector.
●TIMER control
Use this button to set the timer.
●OFF-TIMER button Select the turn OFF time.
●ON-TIMER button Select the turn ON time.
●RESERVE button Time setting reservation.
●CANCEL button Cancel time reservation.
Precautions for Use
●Do not put the remote controller in the following places.
●Under direct sunlight.
●In the vicinity of a heater.
●Handle the remote controller carefully. Do not drop it on the oor,
and protect it from water.
●Once the outdoor unit stops, it will not restart for about 3 minutes
(unless you turn the power switch off and on or unplug the power
cord and plug it in again).
This is to protect the device and does not indicate a failure.
●If you press the FUNCTION selector button during operation, the
device may stop for about 3 minutes for protection.
(EN2) RAS-S18H2AA (1642).indd 4 5/20/10 10:51 AM

– 5 –
AUTOMATIC OPERATION
The device will automatically determine the mode of operation, HEAT, COOL or DEHUMIDIFY depending on the current room
temperature. The selected mode of operation will change when the room temperature varies. However the mode of operation
will not change when indoor unit connected to multi type outdoor unit.
VARIOUS FUNCTIONS
■Auto Restart Control
●If there is a power failure, operation will be automatically restarted when the power is resumed with previous operation mode
and airow direction.
(As the operation is not stopped by remote controller.)
●If you intend not to continue the operation when the power is resumed, switch off the power supply.
When you switch on the circuit breaker, the operation will be automatically restarted with previous operation mode and airow
direction.
Note: 1. If you do not require Auto Restart Control, please consult your sales agent or OFF by remote control.
2. Auto Restart Control is not available when Timer or Sleep Timer mode is set.
■As the settings are stored in memory in the remote controller, you only
have to press the (START/STOP) button next time.
Press the FUNCTION selector so that the display indicates the (AUTO)
mode of operation.
●When AUTO has been selected, the device will automatically determine
the mode of operation, HEAT, COOL or DEHUMIDIFY depending on
the current room temperature. However the mode of operation will
not change when indoor unit connected to multi type outdoor unit.
●If the mode automatically selected by the unit is not satisfactory,
manually change the mode setting (heat, dehumidify, cool or fan).
Press the (START/STOP) button.
Operation starts with a beep.
Press the button again to stop operation.
You can raise or lower the temperature setting as necessary by maximum
of 3°C.
Press the temperature button and the temperature
setting will change by 1°C each time.
●The preset temperature and the actual room temperature may vary
somewhat depending on conditions.
●The display does not indicate the preset temperature in the AUTO mode.
If you change the setting, the indoor unit will produce a beep.
1
START
STOP
Press the (FAN SPEED) button, AUTO, LOW and SILENT is available.
(EN2) RAS-S18H2AA (1642).indd 5 5/20/10 10:51 AM

– 6 –
HEATING OPERATION
●Use the device for heating when the outdoor temperature is under 21°C.
When it is too warm (over 21°C), the heating function may not work in order to protect the device.
●In order to keep reliability of the device, please use this device above -15°C of the outdoor temperature.
Press the FUNCTION selector so that the display indicates
(HEAT).
Set the desired FAN SPEED with the (FAN SPEED) button
(the display indicates the setting).
(AUTO) : The fan speed changes automatically
according to the temperature of the air which
blows out.
(HI) : Economical as the room will become warm
quickly.
But you may feel a chill at the beginning.
(MED) : Fan speed slow.
(LOW) : Fan speed slower.
(SILENT) : Fan speed ultra slower.
Set the desired room temperature with the TEMPERATURE
buttons (the display indicates the setting).
The temperature setting and the actual room temperature may
vary somewhat depending on conditions.
Press the (START/STOP) button. Heating operation starts
with a beep. Press the button again to stop operation.
■As the settings are stored in memory in the remote controller, you only
have to press the (START/STOP) button next time.
1
2
3
START
STOP
■
Defrosting will be performed about once an hour when frost forms on the heat exchange of the outdoor
unit, for 5~10 minutes each time.
During defrosting operation, the operation lamp blinks in cycle of 3 seconds on and 0.5 second off.
The maximum time for defrosting is 20 minutes.
However, if it is connected to multi type outdoor unit, the maximum time for defrosting is 15 minutes.
(If the piping length used is longer than usual, frost will likely to form.)
(EN2) RAS-S18H2AA (1642).indd 6 5/20/10 10:51 AM

– 7 –
DEHUMIDIFYING OPERATION
Use the device for dehumidifying when the room temperature is over 16°C.
When it is under 15°C, the dehumidifying function will not work.
■Dehumidifying Function
● When the room temperature is higher than the temperature setting: The device will dehumidify the
room, reducing the room temperature to the preset level.
When the room temperature is lower than the temperature setting: Dehumidifying will be performed at
the temperature setting slightly lower than the current room temperature, regardless of the temperature
setting. The function will stop (the indoor unit will stop emitting air) as soon as the room temperature
becomes lower than the setting temperature.
● The preset room temperature may not be reached depending on the number of people present in
the room or other room conditions.
Set the desired room temperature with the TEMPERATURE
button (the display indicates the setting).
The range of 20-26C is recommended as
the room temperature for dehumidifying.
Press the (START/STOP) button. Dehumidifying operation
starts with a beep. Press the button again to stop operation.
2
■As the settings are stored in memory in the remote controller, you
only have to press the (START/STOP) button next time.
START
STOP
Press the FUNCTION selector so that the display indicates
(DEHUMIDIFY).
The FAN SPEED is set at LOW or SILENT.
1
(EN2) RAS-S18H2AA (1642).indd 7 5/20/10 10:51 AM

– 8 –
COOLING OPERATION
Use the device for cooling when the outdoor temperature is 21 ~ 43°C.
If in doors humidity is very high (80%), some dew may form on the air outlet grille of the indoor unit.
Press the FUNCTION selector so that the display indicates
(COOL).
Set the desired FAN SPEED with the (FAN SPEED) button
(the display indicates the setting).
(AUTO) : The FAN SPEED is HI at rst and varies
to MED automatically when the preset
temperature has been reached.
(HI) : Economical as the room will become cool
quickly.
(MED) : Fan speed slow.
(LOW) : Fan speed slower.
(SILENT) : Fan speed ultra slower.
Set the desired room temperature with the TEMPERATURE
button (the display indicates the setting).
The temperature setting and the actual room temperature may
vary some how depending on conditions.
Press the (START/STOP) button. Cooling operation starts
with a beep. Press the button again to stop operation. The
cooling function does not start if the temperature setting is
higher than the current room temperature (even though the
(OPERATION) lamp lights). The cooling function will start
as soon as you set the temperature below the current room
temperature.
■As the settings are stored in memory in the remote controller, you
only have to press the (START/STOP) button next time.
1
2
START
STOP
3
(EN2) RAS-S18H2AA (1642).indd 8 5/20/10 10:51 AM

– 9 –
FAN SPEED (AUTO) ..... When the AUTO fan speed mode is set in the cooling/heating operation:
For the heating operation
●The fan speed will automatically change according to the temperature
of discharged air.
●When the difference of room temperature and setting temperature is
large, fan starts to run at HI speed.
●When the room temperature reaches setting temperature, fan speed
changes to LOW automatically.
●When the difference of room temperature and setting temperature is
large, fan starts to run at HI speed.
●After room temperature reaches the preset temperature, the cooling
operation, which changes the fan speed and room temperature to obtain
optimum conditions for natural healthful cooling will be performed.
For the cooling operation
FAN OPERATION
You can use the device simply as an air circulator. Use this function to dry the interior of the indoor
unit at the end of summer.
Press the FUNCTION selector so that the display indicates
(FAN).
Press the (FAN SPEED) button.
(HI) : The strongest air blow.
(MED) : Fan speed slow.
(LOW) : Fan speed slower.
(SILENT) : Fan speed ultra slower.
Press the (START/STOP) button. Fan operation starts with
a beep. Press the button again to stop operation.
1
2
START
STOP
(EN2) RAS-S18H2AA (1642).indd 9 5/20/10 10:51 AM

– 10 –
1Set the (TIME) button.
HOW TO SET THE TIMER
●The device will turn on (off) and off
(on) at the designated times.
●The switching occurs rst at the
preset time that comes earlier.
●The arrow mark appearing on the
display indicates the sequence of
switching operations.
You can set the device to turn off
at the preset time.
After you change the
batteries;
How to Cancel Reservation
Point the signal window of the remote controller toward the indoor unit, and press the (CANCEL)
button.
The (RESERVED) sign goes out with a beep and the (TIMER) lamp turns off on the indoor unit.
1Press the (OFF-TIMER)
button. The (OFF) mark blinks
on the display.
NOTE
You can set only one of the OFF-timer,
ON-timer and ON/OFF-timer.
●The device will turn on
at the designated times.
TIME
OFF TIMER
ON TIMER
RESERVE
CANCEL
AM
1Press the (ON-TIMER)
button the (ON) mark blinks
on the display.
3Press the (ON-
TIMER) button so that the
(OFF) mark lights and
the (ON) mark blinks.
1Press the (ON-OFF)
button so that the (OFF)
mark blinks.
2Set the turn-off time
with the TIMER control
button.
Press the (RESERVE)
button.
(EN2) RAS-S18H2AA (1642).indd 10 5/20/10 10:51 AM

– 11 –
●The time indication will disappear
automatically in 10 second.
●To check the current time setting,
press the (TIME) button twice.
The setting of the current time is
now complete.
●The timer may be used in three ways: off-timer, on-timer, and ON/OFF (OFF/ON)-timer. Set
the current time at rst because it serves as a reference.
●As the time settings are stored in memory in the remote controller, you only have to press
the (RESERVE) button in order to use the same settings next time.
2Press the
(TIME) button.
3Set the current time with the
TIMER control button.
Example: The current time is 1:30 p.m.
2Set the turn-off time with the
TIMER control button.
The setting of turn-off time is now complete.
Example: The device will turn off at 11:00p.m.
Example:
The device will turn on at 7:00 a.m.
The setting of the turn-on time is now complete.
4Set the turn-on time with the
TIMER control button.
5Point the signal window of the remote controller toward the indoor unit, and
press the (RESERVE) button.
The (ON) mark starts lighting instead of ashing and the (RESERVED)
sign lights. A beep occurs and the (TIMER) lamp lights on the indoor unit.
2Set the turn-on time with the
TIMER control button.
Example:
The device will turn off at 10:30 p.m. and it will be turned
on at 7:00 a.m.
The settings of the turn-on/off times are now complete.
4Press the (TIME) button again.
The time indication starts lighting
instead of ashing.
3Point the signal window of the remote controller toward the indoor unit, and
press the (RESERVE) button.
The (OFF) mark starts lighting instead of ashing and the sign (RESERVED)
lights. A beep occurs and the (TIMER) lamp lights on the indoor unit.
3Point the signal window of the remote controller toward the indoor unit, and
press the (RESERVE) button.
The (ON) mark starts lighting instead of ashing and the (RESERVED)
sign lights. A beep occurs and the (TIMER) lamp lights on the indoor unit.
(EN2) RAS-S18H2AA (1642).indd 11 5/20/10 10:51 AM

– 12 –
HOW TO SET THE SLEEP TIMER
1Set the ON-timer.
Set the current time at rst if it is not set before (see the pages for setting
the current time). Press the (SLEEP) button, and the display changes
as shown below.
Mode
Sleep timer
Indication
1 hour 2 hours 3 hours 7 hours
Sleep timer off
444
1
Sleep Timer: The device will continue working for the designated
number of hours and then turn off.
Point the signal window of the remote controller toward the indoor
unit, and press the SLEEP button.
The timer information will be displayed on the remote controller.
The TIMER lamp lights with a beep from the indoor unit. When the
sleep timer has been set, the display indicates the turn-off time.
Example: If you set 3 hours sleep
time at 11:38 p.m., the turn-off
time is 2:38 a.m.
The device will be turned off by the sleep
timer and turned on by on-timer.
How to Cancel Reservation
Point the signal window of the remote controller toward the indoor unit, and press the (CANCEL)
button.
The (RESERVED) sign goes out with a beep and the (TIMER) lamp turns off on the indoor unit.
For heating:
In this case, the device will turn off
in 2 hours (at 1:38 a.m.) and it will
be turned on 6:00 next morning.
2Press the (SLEEP) button and set the sleep timer.
(EN2) RAS-S18H2AA (1642).indd 12 5/20/10 10:51 AM

– 13 –
HOW TO EXCHANGE THE BATTERIES IN THE REMOTE CONTROLLER
1Remove the cover as shown in the gure and take out the
old batteries.
=
2Install the new batteries.
The direction of the batteries should match the marks in the
case.
1. Do not use new and old batteries, or different kinds of batteries
together.
2. Take out the batteries when you do not use the remote controller
for 2 or 3 months.
!
CIRCUIT BREAKER
When you do not use the room air conditioner, set the circuit breaker to “OFF”.
TEMPORARY SWITCH
If the remote controller does not work due to battery failure, press this switch to start and stop operation.
●This temporary operation will be at the setting made most recently. (The unit will immediately go into
automatic operation once power is switched on.)
CAUTION
(EN3) RAS-S18H2AA (1642).indd 13 5/20/10 10:55 AM

– 14 –
Suitable Room Temperature Install curtain or blinds
Ventilation Effective Usage Of Timer
Do Not Forget To Clean The Air Filter Please Adjust Suitable Temperature
For Baby And Children
Warning
Freezing temperature
is bad for health and a
waste of electric power.
!
It is possible
to reduce heat
entering the
room through
windows.
At night, please use the “OFF or ON timer
operation mode”, together with your wake up
time in the morning. This will enable you to
enjoy a comfortable room temperature. Please
use the timer effectively.
Dusty air lter will reduce the air volume and
the cooling efciency. To prevent from wasting
electric energy, please clean the lter every
2 weeks.
Please pay attention to the room temperature
and air ow direction when operating the unit
for baby, children and old folks who have
difculty in movement.
Caution
Do not close the room for a long period of
time. Occasionally open the door and windows
to allow the
entrance of
fresh air.
!
THE IDEAL WAYS OF OPERATION
(EN3) RAS-S18H2AA (1642).indd 14 5/20/10 10:55 AM

– 15 –
FOR USER’S INFORMATION
The Air Conditioner And The Heat Source In The Room
Not Operating For A Long Time
When Lightning Occurs
Caution
If the amount of heat in the room is above the cooling
capability of the air conditioner (for example: more
people entering the room, using heating equipments
and etc.), the preset room temperature cannot be
achieved.
!
When the indoor unit is not to be used for a long
period of time, please switch off the power from the
mains. If the power from mains remains “ON”, the
indoor unit still consumes about 8W in the operation
control circuit even if it is in “OFF” mode.
Warning
To protect the whole unit during lightning, please
stop operating the unit and remove the plug from
the socket.
!
Interference From Electrical Products
Caution
To avoid noise interference, please place the indoor
unit and its remote controller at least 1m away from
electrical products.
!
(EN3) RAS-S18H2AA (1642).indd 15 5/20/10 10:55 AM

– 16 –
ATTACHING THE AIR CLEANSING FILTERS
1Open the front panel.
●Pull up the front panel by holding it at both sides
with both hands.
2Remove the lter.
●Push upward to release the claws and pull out the
lter.
3Attaching the air cleansing lters to the lter.
●Attach the air cleansing lters to the frame by gently
compress its both sides and release after insertion
into lter frame.
4Attach the lters.
●Attach the lters by ensuring that the surface written
“FRONT” is facing front.
●After attaching the lters, push the front panel at
three arrow portion as shown in gure and close it.
Cleaning and maintenance must be carried out only by qualied service personal. Before cleaning,
stop operation and switch off the power supply.
CAUTION
CAUTION
Do not bend the air cleansing
lter as it may cause damage to
the structure.
NOTE
●In case of removing the air cleansing lters, please follow the above procedures.
●The cooling capacity is slightly weakened and the cooling speed becomes slower when the air cleansing
lters are used. So, set the fan speed to "HIGH" when using it in this condition.
●Do not operate the air conditioner without lter. Dust may enter the air conditioner and fault may
occur.
!
!
Claws
(4 places)
(EN3) RAS-S18H2AA (1642).indd 16 5/20/10 10:55 AM

– 17 –
MAINTENANCE
Cleaning and maintenance must be carried out only by qualied service personal.
Before cleaning, stop operation and switch off the power supply.
1. AIR FILTER
Clean the air lter, as it removes dust inside the room. In case the air lter is full of dust, the air ow
will decrease and the cooling capacity will be reduced. Further, noise may occur. Be sure to clean
the lter following the procedure below.
CAUTION
1Open the front panel and remove the lter
●Gently lift and remove the air cleansing lter
from the air lter frame.
2Vacuum dust from the air lter and air cleans-
ing filter using vacuum cleaner. If there is
too much dust, air lter only rinse under running
tap water and gently brush it with soft bristle
brush. Allow lters to dry in shade.
3●Re-insert the air cleansing lter to the lter
frame. Set the lter with “FRONT” mark facing
front, and slot them into the original state.
●After attaching the lters, push the front panel
at three arrow portions as shown in gure and
close it.
CAUTION
●Do not wash with hot water at more than 40°C. The lter may shrink.
●When washing it, shake off moisture completely and dry it in the shade; do not expose it directly
to the sun. The lter may shrink.
●Do not use detergent on the air cleansing lter as some detergent may deteriorate the lter
electrostatic performance.
ROCDR
!
!
(EN3) RAS-S18H2AA (1642).indd 17 5/20/10 10:55 AM

– 18 –
2. Washable Front Panel
●Remove the front panel and wash with clean
water.
Wash it with a soft sponge.
After using neutral detergent, wash thoroughly
with clean water.
●When front panel is not removed, wipe it with
a soft dry cloth. Wipe the remote controller
thoroughly with a soft dry cloth.
●Wipe the water thoroughly.
If water remains at indicators or signal receiver
of indoor unit, it causes trouble.
Method of removing the front panel.
Be sure to hold the front panel with both hands
to detach and attach it.
!
CAUTION
●Do not splash or direct water to the body of the unit when cleaning
it as this may cause short circuit.
●Never use hot water (above 40°C), benzine, gasoline, acid, thinner
or a brush, because they will damage the plastic surface and the
coating.
Removing the Front Panel
●When the front panel is fully opened with both
hands, push the right arm to the inside to
release it, and while closing the front panel
slightly, put it out forward.
Attaching the Front Panel
●Move the projections of the left and right arms
into the Flanges in the unit and securely
insert them into the holes.
(EN3) RAS-S18H2AA (1642).indd 18 5/20/10 10:55 AM