Hitachi RAS-S18CZT User manual

– 1 –
ENGLISH
INDOOR UNIT/OUTDOOR UNIT
OUTDOOR UNIT
INDOOR UNIT
RAS-S18CZT
RAS-S24CZT
MODEL
RAS-S18CZT/RAC-S18CZT
RAS-S24CZT/RAC-S24CZT
Instruction manual Page 1~22
To obtain the best performance and ensure years of trouble free use, please read this instruction
manual completely.
  23~44
 
RAC-S24CZT
SPLIT TYPE
RAC-S18CZT
cover S18-24CZT english 1 10/29/12 3:37 PM

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SAFETY PRECAUTION
● 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.
●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 SHIFTING OR MAINTENANCE
PRECAUTIONS DURING OPERATION
●Avoid an extended period of direct air ow for your health.
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●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.
●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.
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EN1 RAS-S18-24CZT 2 10/29/12 3:35 PM

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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.
●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.
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●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.
● 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.
EN1 RAS-S18-24CZT 3 10/29/12 3:35 PM

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INDOOR UNIT
OUTDOOR UNIT
WIDTH (mm)
1150
850
850
MODEL
RAS-S18CZT / RAS-S24CZT
RAC-S18CZT
RAC-S24CZT
HEIGHT (mm)
333
650
800
DEPTH (mm)
245
298
298
MODEL NAME AND DIMENSIONS
NAMES AND FUNCTIONS OF EACH PART
AIR FILTER
To prevent dust from coming into the indoor unit.
(Refer page 18)
FRONT PANEL (AIR INLET).
INDOOR UNIT INDICATORS
Light indicator showing the operating condition.
(Refer page 5)
HORIZONTAL DEFLECTOR ●VERTICAL
DEFLECTOR (AIR OUTLET)
(Refer page 13)
REMOTE CONTROLLER
Send out operation signal to the indoor unit. So
as to operate the whole unit.
(Refer page 6)
●
DRAIN PIPE
Condensed water drain to outside.
CONNECTING CORD AND INSULATION
PIPE FOR PIPING
AIR INLET (BACK, LEFT SIDE)
AIR OUTLET
DRAIN PIPE
Condensed water drain to outside.
CONNECTING CORD AND INSULATION
PIPE FOR PIPING
AIR INLET (BACK, LEFT SIDE)
AIR OUTLET
RAC-S18CZT
RAC-S24CZT
EN1 RAS-S18-24CZT 4 10/29/12 3:35 PM

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INDOOR UNIT INDICATORS
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.
OPERATION INDICATOR
TIMER LAMP
This lamp lights when the timer is working.
OPERATION LAMP
This lamp lights during operation.
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”.
EN1 RAS-S18-24CZT 5 10/29/12 3:35 PM

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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.
●Transmission sign
The transmission sign blinks when a signal is sent.
●Display
This indicates the room temperature selected, timer status, function
and intensity of circulation selected.
●CIRCULATION button
Use this button to set air circulation in the room or start operation.
●DEHUMIDIFYING button
Use this button to dehumidify the room or start operation.
●COOLING button
Use this button to set cooling mode in the room or start operation.
●RESET button
●PARALLEL SWING buttonA
Controls the angle of the vertical air deectors to parallel.
●STOP button
Press this button to stop operation only.
●SUPER SILENT button
Use this button to set silent condition.
●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).
●AUTO SWING button
Controls the angle of the horizontal air deector.
●TEMPERATURE button
Use this button to raise or lower the temperature setting. (Keep
pressed, and the value will change more quickly.)
●SLEEP button
Use this button to set the sleep timer.
●ON-TIMER button Select to turn ON time.
Precautions for Use
●Do not put the remote controller in the following places.
●In 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.

– 7 –
COOLING OPERATION
Use the device for cooling when the outdoor temperature is 21~43°C.
If indoor humidity is very high (over 80%), some dew may form on the air outlet grille of the indoor unit.
Press the button so that the display indicates
(COOL).
Cooling operation starts with a beep.
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.
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 or LOW 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.
Set the desired room temperature with the TEMPERATURE
button (the display indicates the setting).
The range of 25 ~ 28°C is recommended as
the room temperature for cooling.
If the temperature setting is 27°C, the room
temperature will be controlled at around 27°C.
The temperature setting and the actual room temperature may
vary somewhat depending on conditions.
Press the (STOP) button to stop operation.
1
■As the settings are stored in memory in the remote controller, you
only have to press the (COOLING) button next time.
2
STOP
3

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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,
and 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.
■As the settings are stored in memory in the remote controller, you
only have to press the (DEHUMIDIFY) button next time.
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.
2
Press the (DEHUMIDIFY) button.
Dehumidifying operation starts with a beep.
The FAN SPEED is set at LOW automatically.
The FAN SPEED button does not work.
1
Press the (STOP) button to stop operation.
STOP
°C

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SUPER SILENT
Press the button.
●Operation start with a signal received sound “beep”.
●Unit will be forced operate in any operation mode as before
with SUPER SILENT fan speed. The indication of operation
mode, temperature setting, fan speed and timer value on
remote controller will remain no change.
1
CANCELLATION of SUPER SILENT Operation
Cancel Condition Operation mode after cancel
Press button.
Sleeping timer time is up Stop operation
Press button Next fan speed operation
NOTE:
Under SUPER SILENT operation and quiet environment, phenomena like owing noise of refrigerant
in the refrigerating cycle may occur, but this is normal for the operation.

– 10 –
CIRCULATION OPERATION
Press the button so that the display indicates
(CIRCULATE).
Circulating operation starts with a beep.
Press the FAN SPEED button and select the desired FAN
SPEED (the display indicates your choice).
Press the temperature control button to set to the desired
temperature.
■As the settings are stored in memory in the remote controller,
you only have to press the (CIRCULATION) button next time.
1
3
Press the (STOP) button to stop operation.
STOP
2
■Circulation Function
●During circulation operation, compressor will not be running and there is no cooling operation with only
indoor fan running.
●When the setting temperature is higher than room temperature, indoor fan will stop running.

– 11 –
HOW TO SET THE SLEEP TIMER
Press the (SLEEP) button, and the display changes as shown below.
Mode
Sleep
timer
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.
SLEEP
4
Indication
1 hr 2 hrs 3 hrs 10 hrs 11 hrs 12 hrs
Sleep timer off
44
Explanation of the sleep timer
The device will control the FAN SPEED and room temperature automatically so as to
be quiet and good for people’s health.
●You can not set other timer during sleep timer operation.
●After sleep timer time is up and when press sleep button again, the sleep timer
will be set as last setting.
●Sleep timer effective only once.
NOTE

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HOW TO SET THE TIMER
ON TIME setting
●Select the ON TIMER by pressing the (ON)
Button.
●Setting time will change according to the below
sequence.
ON Timer Reservation ■Operation will start for setting
temperature at setting time (The starting
time may different depend on the room
temperature and set temperature).

– 13 –
AIR FLOW LOUVERS ADJUSTMENTS
1
●If the “ (AUTO SWING)” button is pressed once,
the horizontal air deector swings up and down. If the
button is pressed again, the deector stops in its current
position. Several seconds (about 6 seconds) may be
required before the deector starts to move.
●Use the horizontal air deector within the adjusting range
shown on the right.
●When the operation is stopped, the horizontal air deector
moves and stops at the position where the air outlet
closes.
CAUTION
●In “Cooling” operation, do not keep the horizontal air
deector swinging for a long time. Some dew may form
on the horizontal air deector and dew may drop.
Adjustment of the conditioned air in the upward and downward
directions.
The horizontal air deector is automatically set to the proper
angle suitable for each operation. The deector can be swung
up and down continuously and also set to the desired angle
using the “ (AUTO SWING)” button.
Horizontal air deector
2Adjustment of the conditioned air in the left and right directions.
●If the “ (PARALLEL SWING)” button is pressed
once, the vertical air deectors swing left and right to
parallel. If the button is pressed again, the deectors
stop in their current position. Several second (about 6
seconds) may be required before the deectors start to
move.
●PARALLEL SWING

– 14 –
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.
3. Use high quality and high performance AAA batteries
to avoid short operating life and electrolyte leakages
CAUTION
When using the remote control, if there is no response from the air conditioner unit and or the remote
control has fading and dim displays, the batteries in the remote control device need to be removed and
replaced with new ones

– 15 –
THE IDEAL WAYS OF OPERATION
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 “sleep 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.
EN3 RAS-S18-24CZT 15 10/29/12 3:30 PM

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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-S18-24CZT 16 10/29/12 3:30 PM

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ATTACHING THE AIR PURIFYING FILTERS
1Open the front panel
●Pull up the front panel by holding it at both sides
with both hands.
2Remove the pre-lter
●Push upward to release the claws and pull out the
lter.
3Attaching the air purifying lters
●Attach the air purifying lters to the frame by gently
compress its both sides and release after insertion
into lter frame.
4Attach the pre-lter
●Attach the pre-lter by ensuring that the surface
written “FRONT” is facing front.
●After attaching the pre-lter, 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 personnel. Before cleaning,
stop operation and switch off the power supply.
CAUTION
CAUTION
Do not bend the air purifying
lter as it may cause damage
to the structure.
NOTE
●In case of removing the air purifying lters, please follow the above procedures.
●The cooling capacity is slightly weakened and the cooling speed becomes slower when the air
purifying lters are used. So, set the fan speed to "HIGH" when using it in this condition.
●Air purifying lters are not washable and can be use in 1 year time. Type number for this air purifying
lter is <SPX-NTW2>. Please use this number for ordering when you want to renew it.
●Do not operate the air conditioner without pre-lter. Dust may enter the air conditioner and fault may
occur.




Claws
(4 places)
EN3 RAS-S18-24CZT 17 10/29/12 3:30 PM

– 18 –
MAINTENANCE
Cleaning and maintenance must be carried out only by qualied service personnel. Before cleaning,
stop operation and switch off the power supply.
1. PRE-FILTER
Clean the pre-lter, as it removes dust inside the room. In case the pre-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 pre-lter following the procedure below.
CAUTION
1Open the front panel and remove the pre-lter
●Gently lift and remove the air purifying lter
from the pre-lter frame.
2Vacuum dust from the pre-lter and air purifying
lter using vacuum cleaner. If there is too much
dust, rinse pre-lter under running tap water
and gently brush it with soft bristle brush. Allow
lters to dry in shade.
3●Re-insert the air purifying lter to the lter
frame. Set the pre-lter with “FRONT” mark
facing front, and slot them into the original
state.
●After attaching the pre-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 pre-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 pre-lter may shrink.
NOTE:
●Air purifying 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.

EN3 RAS-S18-24CZT 18 10/29/12 3:30 PM

– 19 –
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.
Flange
Hole Projection
EN3 RAS-S18-24CZT 19 10/29/12 3:30 PM

– 20 –
3. MAINTENANCE AT BEGINNING OF LONG OFF PERIOD
●Run the unit by setting the operation mode to
(CIRCULATION), the temperature to 16°C and the fan
speed to HI for about half a day on a ne day, and dry
the whole of the unit.
●Switch off the power plug.
1
2
3
REGULAR INSPECTION
PLEASE CHECK THE FOLLOWING POINTS BY QUALIFIED SERVICE PERSONAL EITHER
EVERY HALF YEARLY OR YEARLY. CONTACT YOUR SALES AGENT OR SERVICE SHOP.
Is the earth line disconnected or broken?
Is the mounting frame seriously affected by rust and is the
outdoor unit tilted or unstable?
Is the plug of power line rmly plugged into the socket?
(Please ensure no loose contact between them).
Cleaning and maintenance must be carried out only by qualied service personnel. Before cleaning,
stop operation and switch off the power supply.
CAUTION
Note :
If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or similarly
qualied persons in order to avoid a hazard.
EN3 RAS-S18-24CZT 20 10/29/12 3:30 PM