Hitachi RAK-25RXB User manual

– 1 –
SPLIT TYPE AIR CONDITIONER
INDOOR UNIT
MODEL
This room air conditioner is only for consumer usage.
Do not use for preservation of foods, animals, plants, precision machines, art, medicine or such.
Instruction manual Page 1~10
To obtain the best performance and ensure years of trouble free use, please read this instruction manual completely.
RAR-6N1
RAK-35RXB
RAK-50RXB
RAK-25RXB
RAK-18QXB
RAK-25RXB
RAK-18QXB
RAK-35RXB
RAK-50RXB

– 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 signs indicate the following meanings. (The following are examples of signs.)
PRECAUTIONS DURING OPERATION
WARNING
WARNING
SAFETY PRECAUTION
•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 or fire.
•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.
•
•Please ensure smooth flow of water when installing the drain hose.
•Make sure that a single phase power source is used.
The use of other power sources may cause electrical components to overheat
and lead to fire.
PRECAUTIONS DURING INSTALLATION
PROHIBITION
CONNECT EARTH LINE
PROHIBITION
WARNING
CAUTION
•
•
•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.
PRECAUTIONS DURING SHIFTING OR MAINTENANCE
•Do not use any conductor as fuse wire, this could cause fatal accident.
•During thunder storm, disconnect the plug top and turn off the circuit
breaker.
•Do not put objects like thin rods into the panel of blower and suction side
because the high-speed fan inside may cause danger.
•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.
PROHIBITION
PROHIBITION
PROHIBITION
PROHIBITION
“OFF”
“OFF”
PROHIBITION
Avoid an extended period of direct airflow for your health.
220V-230V
Please keep this manual after reading.
Make sure to connect earth line.
Indicates the instructions that must be followed.
This sign in the figure indicates prohibition.
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.
Should abnormal situation arise (like burning smell), please stop operating the
unit and turn off the circuit breaker. Contact your
fire may occur if you continue to operate the unit under abnormal situation.
agent. Fault, short circuit or

– 3 –
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•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.
•tondnanoitacificepsrerutcafunamehtrednudetarepoebllahstcudorpehTfor any other intended use.
PRECAUTIONS DURING OPERATION
CAUTION
•Do not attempt to operate the unit with wet hands, this could cause fatal
accident.
•When operating the unit with burning equipments, regularly ventilate
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•tuohtiwdnamrif,elbatssyawlasiemarfgnitnuomroodtuotahterusneesaelPdefect. If not, the outdoor unit may collapse and cause danger.
•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.
•Be sure to stop the operation by using the remote controller 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 be operated for a long period.
•Do not climb on the outdoor unit or put objects on it.
•When operating the unit with the door and windows opened, (the room
gnivomronwodgnicafrotcelfedriaehthtiwdna)%08evobasyawlasiytidimuh
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.
•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.
•roodtuoehtfonifmuinimuladnaecafrusmottob,teltuoriaehthcuottonoDunit.
You may get hurt.
Do not touch the refrigerant pipe and connecting valve.
Burns may result.
PROHIBITION
DON’T WET
PROHIBITION
PROHIBITION
PROHIBITION
DON’T TOUCH
“OFF”
PROHIBITION
PROHIBITION
PROHIBITION
PROHIBITION
PROHIBITION
DON’T TOUCH
STRICTLY OBSERVE
PRECAUTIONS
“OFF”
•
•This appliance is not to be used by children or persons with reduced physical, sensory or
mental capabilities, or lack of experience and knowledge, unless they have been given
supervision or instruction. Children must be supervised not to play with the appliance.

– 4 –
NAMES AND FUNCTIONS OF EACH PART
OPERATING RANGE
Operation mode Cooling / Dehumidifying Heating
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NOTE FOR MULTI SYSTEM
Several indoor units can be connected to one outdoor unit.
You can operate only one unit or several units according to your needs.
Combination of operations:
When operation mode is selected:
You cannot operate the indoor units in the
following combinations.
One unit Other unit
Heating
Cooling
Dehumidifying
Fan
During automatic operation
The indoor unit which is turned on first continues to
operate. Other indoor units which are turned on later
go into standby mode and the operation lamp lights.
To operate the indoor units turned on later, set the
operation mode as same as the indoor unit turned
on first.
When heating operation is automatically selected for the first indoor unit, the next indoor unit will then start to
heat. Also, if cooling or dehumidifying is automatically selected for the first indoor unit, the next indoor unit will
also start to cool or dehumidify.
Adjusting the number of indoor units:
Decrease the number of indoor
units to be operated especially
when it is very hot or very cold
or when you want to reach the
preset temperature quickly.
Stopped indoor units:
When an indoor unit is operated in the cooling,
heating or dehumidifying mode in one room,
the sound of refrigerant flow may be heard
from a stopped indoor unit or a stopped indoor
unit may become warm. This is because the
indoor unit returns refrigerant to the outdoor
unit to be ready for operation.
INDOOR UNIT Air filter
To prevent dust from coming into the indoor unit.
(Refer page 6)
Front panel
(Refer page 7)
Indoor unit indicators
Light indicator showing the operating condition.
(Refer page 5)
Horizontal deflector Vertical deflector
(Air Outlet)
Remote controller
Send out operation signal to the indoor unit. So as to
operate the whole unit.
MODEL NAME AND DIMENSIONS
MODEL WIDTH (mm) HEIGHT (mm) DEPTH (mm)
900 295 210
RAK-18QXB,RAK-25RXB,RAK-35RXB,RAK-50RXB
ECO Sensor

– 5 –
NAMES AND FUNCTIONS OF EACH PART
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).
Attaching the Wasabi-Nano Titanium Air Cleaning
Attach the
to the C-case 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
are used.
.
and reusable up to 20 times by using vacuum
cleaner or water rinse under running tap water.
When you want to renew it, please ask your sales
agent. Optional air cleansing and deodorizing
filters.
Air FilterClaw
Filter Frame
Mesh (Accessories) to the filter frame.
Wasabi-Nano Titanium Air Cleaning Mesh
Wasabi-Nano Titanium Air Cleaning Mesh
Wasabi-Nano Titanium Air Cleaning Mesh are washable
Wasabi-Nano Titanium Air Cleaning Mesh
C-case
INDOOR UNIT INDICATIONS
TIMER LAMP (Orange)
This lamp lights when the
timer is working.
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
CAUTION
Turn off the circuit breaker
if the unit is not be operated
for a long period.
Use this switch to start and stop when the remote
controller does not work.
By pressing the temporary switch, the operation is
done in automatic 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.
ECO Sensor Lamp(Green)

– 2 –
PREPARATION BEFORE OPERATION
■To install the batteries
■To fix the remote controller holder to the wall
1. Slide the cover to take it off.
2. Install two dry batteries AAA.LR03 (alkaline).
The direction of the batteries should match the
marks in the case.
3. Replace the cover at its original position.
1. Choose a place from where the signals can reach the unit.
2. Fix the remote controller holder to a wall, a pillar or similar
location with the provided screws.
3. Place the remote controller in the remote controller holder.
NOTE
Notes on batteries
●When replacing the batteries, use batteries of the same
type, and replace both old batteries together.
●When the system is not used for a long time, take the
batteries out.
● The batteries will last for approximately 1 year. However, if
the remote controller display begins to fade and degradation
of reception performance occurs within a year, replace both
batteries with new size AAA.LR03 (alkaline).
● The attached batteries are provided for the initial use of
the system.
The usable period of the batteries may be short depending
on the manufactured date of the air conditioner.
Notes on the remote controller
● Never expose the remote controller to direct sunlight.
● Dust on the signal transmitter or receiver will reduce the
sensitivity. Wipe off dust with soft cloth.
● Signal communication may be disabled if an electronic-
starter-type fluorescent lamp (such as inverter-type lamps)
is in the room. Consult the shop if that is the case.
●If the remote controller signals happen to operate another
appliance, move that appliance to somewhere else, or
consult the service shop.
●When the remote controller is not in use, please close the
slide cover to prevent failure.
Remote controller
Screws
Remote controller holder

– 3 –
ENGLISH
PREPARATION BEFORE OPERATION
■To set calendar and clock
1. Press (RESET) button when first time setting.
"Year" blinks.
2. Press (TIME) button to set the current year.
3. Press (CLOCK) button. "Day" and "Month"
blink.
4. Press (TIME) button to set the current day and
month.
5. Press (CLOCK) button. "CLOCK" blinks.
6. Press (TIME) button to set the clock to the current
time.
7. Press (CLOCK) button.
Calendar and clock are set.
To modify the calendar and clock, press (CLOCK)
button.
Then follow steps 1 to 7.
Calendar and clock need to be set again after changing
batteries.
After changing the batteries,
1. Press (RESET) button.
2. Direct remote controller towards indoor unit and press
(INFO) button.
3. The calendar and clock from indoor unit will be transmitted.
■Calendar and clock will not be transmitted from indoor
unit when the following occurs:
● When there is a power failure.
● When breaker is OFF by user (unit is not in STANDBY
MODE).
NOTE
Note on setting the calendar and clock.
●If the calendar and clock are not set, the ON-timer, OFF-timer and Weekly Timer cannot be set.
●If the calendar and clock are not set correctly, the ON-timer, OFF-timer and Weekly Timer will not
operate correctly.
●When the ON-timer, OFF-timer and Weekly Timer are set, the calendar and clock cannot be changed.
If there is a need to change the calendar and clock, ON-timer, OFF-timer and Weekly Timer need to
be cancelled.

– 4 –
NAMES AND FUNCTIONS OF REMOTE CONTROLLER
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 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.
●When remote controller is not in use for about 3 minutes during OFF condition, indicated by on the
display, the LCD will turn off.
●During clock setting, the LCD will turn off about 10 minutes later if the remote controller is not in use.
●When pressing any button, the LCD will turn on.
●The LCD will not turn off during TIMER setting.
Signal Transmitting/Receiving
Window
Point this window towards the
indoor unit when controlling it.
Sensor
A temperature sensor inside the
remote controller senses ambient
temperature around the remote-
controller.
Display
This indicates the room temperature
selected, current time, timer status,
function and airflow rate selected.
ROOM TEMPERATURE setting Buttons
Press these buttons to set the room
temperature.
Press the [ ] button to raise the room
temperature.
Press the [ ] button to lower the room
temperature.
Keep pressing and the value will change
more quickly.
ECO Button
Use this button to set the ECO
mode. ( p. 13)
START/STOP button
Press this button to start
operation. Press it again to stop
operation.
FAN SPEED selector Button
This determines the fan speed.
Every time you press this button,
the airflow rate will change from
(AUTO) ➞(HIGH) ➞
(MED) ➞(LOW) ➞
(SILENT) (This button allows
selection of optimal or preferred fan
speed for each operation mode).
Transmission sign
The transmission sign lights up
when a signal is sent.

– 5 –
ENGLISH
MODE SELECTOR
AUTO
HEAT
DEHUMIDIFY
COOL
FAN
FAN SPEED
AUTO
SILENT
LOW
MED
HIGH
START / STOP
ECO
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 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 MODE selector button during operation, the device may stop for about 3 minutes for
protection.
POWERFUL Button
Use this button to set the
POWERFUL mode. ( p. 11)
INFORMATION Button
(p. 26)
ONE TOUCH CLEAN Button
( p. 16)
ON / OFF TIMER setting Buttons
( p. 17)
MODE selector Button
Use this button to select the
operating mode. Every time you
press this button, the mode will
change from (AUTO) ➞
(HEAT) ➞(DEHUMIDIFY)
➞ (COOL) and ➞(FAN)
cyclically.
SILENT Button
Use this button to set the SILENT
mode. ( p. 12)
AUTO SWING (Vertical) Button
Controls the angle of the
horizontal air deflector. ( p. 10)
AUTO SWING (Horizontal) Button
Controls the angle of the vertical
air deflector. ( p. 10)
WEEKLY TIMER setting Buttons
( p. 20)
LEAVE HOME Button
( p. 15)
NAMES AND FUNCTIONS OF REMOTE CONTROLLER
ECO SLEEP TIMER Button
Use this button to set the ECO
sleep timer. ( p. 18)
FAN
POWERFUL
SILENT
INFO
SLEEP TIMER
AUTO SWING (VERTICAL)
AUTO SWING (HORIZONTAL)
LEAVE HOME
CLEAN
DAY
PROGRAM NO.
ON / OFF TIMER
TIME
OK
DELETE
COPY / PASTE
CANCEL
SEND
CLOCK

– 6 –
AUTOMATIC OPERATION
The device will automatically determine the mode of operation, HEAT or COOL 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 is 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 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.
■As the settings are stored in the memory of the remote controller, you
only have to press the (START/STOP) button next time.
Press the MODE selector button 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. However the mode of operation will
not change when indoor unit is 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 (FAN SPEED) button to select AUTO, HIGH, MED, LOW
or SILENT.
Press the (START/STOP) button.
Operation starts with a beep.
Press the button again to stop operation.
Set the desired room temperature with the TEMPERATURE buttons
(the display indicates the setting).
The temperature setting and the actual room temperature may vary
depending on conditions.
Temperature range can be set between 16°C and 32°C.
START
STOP
1
2
3
Set the desired FAN SPEED with the (FAN SPEED) button (the
display indicates the setting).
(AUTO) (HIGH) (MED)
(SILENT) (LOW)