Hitachi RAS-25YHA4, RAC-25YHA3, RAS-35YHA4, RAC-35YHA4, RAC-25YHA4 Instruction Manual

– 1 –

HSILGNE

SPLIT TYPE AIR CONDITIONER

MODEL

RAS-25YHA3/RAC-25YHA3

INDOOR UNIT/OUTDOOR UNIT

INDOOR UNIT

Instruction manual Page 1~20

To obtain the best performance and ensure years of trouble free use, please read this instruction manual completely.

OUTDOOR UNIT

RAC-25YHA3

RAS-35YHA4 /RAC-35YHA4

RAC-35YHA4

RAS-25YHA3
RAS-35YHA4

– 2 –

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 signs indicate the following meanings. (The following are examples of signs.)

• Please keep this manual after reading.

This sign in the figure indicates prohibition. Indicates the instructions that must be followed.

WARNING

CAUTION

• Do not reconstruct the unit.
Water leakage, fault, short circuit or fire may occur if you reconstruct the unit by
yourself.

• Please ask your sales agent or qualified technician for the installation of your
unit.
Water leakage, short circuit or fire 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 specified 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 the unit near a location where there is flammable gas.
The outdoor unit may catch fire if flammable gas leaks around it. Piping shall be
suitable supported with a maximum spacing of 1m between the supports.

• Please ensure smooth flow of water when installing the drain hose. If any failure
is found in the drain path, water drops from the indoor and outdoor units, causing
wet household effects.

• Make sure that a single phase 240V power source is used.
The use of other power sources may cause electrical components to overheat
and lead to fire.

PROHIBITION

CONNECT EARTH LINE

PROHIBITION

PROHIBITION

• Should abnormal situation arise (like burning smell), please stop operating the
unit and remove plug from the socket or turn off the circuit breaker. Contact your
agent. Fault, short circuit or fire 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 fire.

• Please contact your agent if you need to remove and reinstall the unit.
Electric shock or fire may occur if you remove and reinstall the unit yourself improperly.

WARNING

PRECAUTIONS DURING INSTALLATION

PRECAUTIONS DURING SHIFTING OR MAINTENANCE

“OFF”

PROHIBITION

• Avoid an extended period of direct air flow for your health.

• Do not connect the power calbe with an extension cable or do not plug too many
leads of the other electric appliance into the socket where this cable is plugged.
In addition, wire the cable with some allowances to prevent the cable from stretching.
Not doing so will cause an electrical shock, heat generation or fire.

PROHIBITION

• Do not put objects like thin rods into the panel of blower and suction side
because the high-speed fan inside may cause danger.

• Do not bundle the power cable, pull it, put something on it, heat it, process it, or
put it between things. Breakage of the power cable may result.
Use of a damaged cable may cause an electrical shock or a fire.

PROHIBITION

PROHIBITION

– 3 –

HSILGNE

WARNING

PRECAUTIONS DURING OPERATION

• Do not use any conductor as fuse wire, this could cause fatal accident.

PROHIBITION

• During thunder storm, disconnect the plug top or turn off the circuit breaker.

• Spray cans and other combustibles should not be located within a meter of the air
outlets of both indoor and outdoor units.
As a spray can’s internal pressure can be increased by hot air, a rupture may result.

“OFF”

CAUTION

PROHIBITION

• The product shall be operated under the manufacturer specification and not for
any other intended use.

PROHIBITION

DON’T WET

• Do not attempt to operate the unit with wet hands, this could cause fatal accident.

STRICTLY OBSERVE

PRECAUTIONS

PROHIBITION

PROHIBITION

PROHIBITION

PROHIBITION

PROHIBITION

• When operating the unit with burning equipments, regularly ventilate
the room to avoid oxygen insufficiency.

• 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 wash the unit with water or place a water container such as a
vase on the indoor unit.
Electrical leakage could be present and cause electric shock.

• Please ensure that outdoor mounting frame is always stable, firm and
without defect. If not, the outdoor unit may collapse and cause danger.

• Do not place plants or animals directly under the air flow as it is bad for the plants or
animals.

• Do not climb on the outdoor unit or put objects on it.

PROHIBITION

PROHIBITION

PROHIBITION

DON’T TOUCH

DON’T TOUCH

• When operating the unit with the door and windows opened, (the room humidity
is always above 80%) and with the air deflector facing down or moving automati­cally for a long period of time, water will condense on the air deflector 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 especially indoor unit cleaning must be performed by authorized
personnel only. Consult your sales agent.
Using a commercially available detergent or similar can damage the plastic parts
or clog the drain pipe, causing water to drip with potential electric shock hazard.

• Do not touch the air outlet, bottom surface and aluminum fin of the outdoor
unit.
You may get hurt.

• Do not touch the refrigerant pipe and connecting valve.
Burns may result.

• This appliance is not intended for use by young children or infirm persons unless they have been
adequately supervised by a responsible person to ensure that they can use this appliance safely.

• Young children should be supervised to ensure that they do not play with the appliance.

– 4 –

NAMES AND FUNCTIONS OF EACH PART

INDOOR UNIT

Air filter
To prevent dust from coming into the indoor unit.

(Refer page 16)

Front panel

Indoor unit indicators
Light indicator showing the operating condition.

(Refer page 5)

Horizontal deflector Vertical deflector
(Air Outlet)

(Refer page 15)

Remote controller
Send out operation signal to the indoor unit. So as
to operate the whole unit.

(Refer page 6)

MODEL NAME AND DIMENSIONS

About the outdoor unit:

• When “Stop” is selected during operation
of the indoor unit, the fan of the outdoor
unit continues turning for 10 to 60
seconds to cool the electric parts down.

• In heating operation, condensate or
water due to defrosting will flow.
Do not cover the drain port of the outdoor
unit because such water may freeze in
the chilly area.

• When the outdoor unit is hung on the
ceiling, install the bush and drain pipe
on the drain port and drain water.

MODEL WIDTH (mm) HEIGHT (mm) DEPTH (mm)

780 280 220

750 548 288RAC-25YHA3

Air outlet
When “heating” operation is
performed, cool air blows and
when “cooling” or “dehumidifying”
operation is performed, warm air
blows.

Drain hose
Drains the dehumidified water from the indoor unit to the
outdoor during “cooling” or “dehumidifying” operation.

Piping and Wiring

Air inlets (Rear and left sides)

Drain port

(Bottom)

Earth terminal

(Lower section of the side)

OUTDOOR UNIT

RAS-25YHA3\

RAC-35YHA4

RAS-35YHA4

– 5 –

ENGLISH

NAMES AND FUNCTIONS OF EACH PART

INDOOR UNIT INDICATIONS

TIMER LAMP (Orange)
This lamp lights when the timer is working.

FILTER LAMP (Green)
When the device is operated for a total of about 200
hours, the FILTER lamp lights indicates that it is time
to clean the filter.The lamp goes out when the
“

(AUTO SWING)” button is pressed while the

operation is stopped.
OPERATION LAMP (Yellow)
This lamp lights during operation.
The OPERATION LAMP flashes 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 an hour
when frost forms on the heat exchanger of the
outdoor unit, for 5-10 minutes each time.

TEMPORARY SWITCH

Use this switch to start and stop when the remote controller does not work.
This temporary operation will be at the most recent setting made. (The unit
will immediately go into automatic operation once power is switched on.)

CAUTION

Turn off the circuit breaker or pull out
the power plug if the unit is not be
operated for a long period.

If the power stays on and the unit is not operated, power is slightly consumed in the control circuit.
The power is saved by turning off the power switch (or the circuit breaker when the power is supplied
from the outdoor unit).

Frame

Attaching the air purifying filters (Accessories) to the filter frame.

• Attach the air cleansing and deodorizing filters to the frame by
gently compress its both sides and release after insertion into
filter frame.

• The cooling capacity is slightly weakened and the cooling speed
becomes slower when the air purifying filters
are used.

• Air purifying filters can be used for about 1
year. When you want to renew it, please ask your sales agent.
Optional air cleansing and deodorizing filters(SPX-CFH15).

– 6 –

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.
AUTO SWING button
Controls the angle of the horizontal air deflector.
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.)

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 button

Press this button after the batteries are replaced or when some irregular
operation is found.

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
AUTO SWING button
TIMER control

Use these buttons 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.

NAMES AND FUNCTIONS OF EACH PART

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, in some cases, the control signal may not be received.
This unit can be fixed on a wall using the fixture provided. Before fixing 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.

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 floor, 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.

– 7 –

HSILGNE

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 airflow 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 airflow direction.
Note: 1. If you do not require Auto Restart Control, please consult your sales agent.

2. Auto Restart Control is not available when Timer or Sleep Timer mode is set.

AUTOMATIC OPERATION

The device will automatically determine the mode of operation, HEAT or COOL depending on the
initial room temperature. The selected mode of operation will change when the room temperature
varies.

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 or COOL depending
on the current room temperature.

• When AUTO is first selected, the device will determine the
current room temperature and select the proper operation
mode accordingly.

• When the air conditioner has adjusted the room's temperature
to the near preset temperature, it will begin to monitor
operation. If the room temperature subsequently changes,
the air conditioner will once again select the appropriate
operation (heating or cooling) to adjust the temperature to
the preset temperature. The monitoring operation range is

+

3°C relative to the preset temperature.

• If the mode automatically selected by the unit is not
satisfactory, manually change the mode setting (heat,
dehumidify, cool or fan).

1

Press the (START/STOP) button.
Operation starts with a beep.
Press the button again to stop operation.

Press the (FAN SPEED) button to select AUTO, LOW and SILENT.

As the settings are stored in memory in the remote controller, you
only have to press the

(START/STOP) button next time.

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.

START

STOP

– 8 –

Press the (START/STOP) button. Heating operation starts
with a beep. Press the button again to stop operation.

START

STOP

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).

1

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) : Quiet.

(LOW) : More quiet.

(SILENT) : Silent.

2

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.

3

As the settings are stored in memory in the remote controller, you
only have to press the

(START/STOP) button next time.

Defrosting

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.

(If the piping length used is longer than usual, frost will likely to form.)