RAC25NH4/RAK25NH4
RAC35NH4/RAK35NH4
RAC50NH4/RAK50NH4
RAK25NH4
RAK35NH4
RAK50NH4
RAC25NH4
RAC35NH4
RAC50NH4
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.
Make sure to connect earth line. |
The sign in the figure indicates prohibition. |
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Indicates the instructions that must be followed.
● Please keep this manual after reading.
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PRECAUTIONS DURING INSTALLATION |
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● Do not reconstruct the unit. |
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Water leakage, fault, short circuit or fire may occur if you reconstruct the |
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unit by yourself. |
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● Please ask your sales agent or qualified technician for the installation of |
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your unit. Water leakage, short circuit or fire may occur if you install the unit |
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WARNING |
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by yourself. |
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● Please use earth line. |
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Do not place the earth line near water or gas pipes, lightning-conductor, or |
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the earth line of telephone. Improper installation of earth line may cause |
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electric shock. |
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● A circuit breaker should be installed depending on the mounting site of the |
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unit. Without a circuit breaker, the danger of electric shock exists. |
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CAUTION |
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● Do not install near location where there is flammable gas. The outdoor unit |
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may catch fire if flammable gas leaks around it. |
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● Please ensure smooth flow of water when installing the drain hose. |
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PRECAUTIONS DURING SHIFTING OR MAINTENANCE |
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Should abnormal situation arises (like burning smell), please stop operating the unit |
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and turn off the circuit breaker. Contact your agent. Fault, short circuit or fire may |
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occur if you continue to operate the unit under abnormal situation. |
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Please contact your agent for maintenance. Improper self maintenance may cause |
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electric shock and fire. |
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Please contact your agent if you need to remove and reinstall the unit. Electric |
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shock or fire may occur if you remove and reinstall the unit yourself improperly. |
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PRECAUTIONS DURING OPERATION
● Avoid an extended period of direct air flow for your health.
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● Do not put objects like thin rods into the panel of blower and suction side |
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because the high-speed fan inside may cause danger. |
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● Do not use any conductor as fuse wire, this could cause fatal accident. |
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● During thunder storm, disconnect and turn off the circuit breaker. |
– 1 –
PRECAUTIONS DURING OPERATION
● The product shall be operated under the manufacturer specification and not for any other intended use.
● 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 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.
● 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 splash or direct water to the body of the unit when cleaning it as this may cause short circuit.
!● Do not use any aerosol or hair sprays near the indoor unit. This chemical
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can adhere on heat exchanger fin and blocked the evaporation water flow |
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to drain pan. The water will drop on tangential fan and cause water splashing |
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out from indoor unit. |
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● Please switch off the unit and turn off the circuit breaker during cleaning, the |
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high-speed fan inside the unit may cause danger. |
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● Turn off the circuit breaker if the unit is not to be operated for a long period.
● Do not climb on the outdoor unit or put objects on it.
●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 flow as it is bad for the plants.
●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.
–2 –
NAMES AND FUNCTIONS OF EACH PART
INDOOR UNIT
Air filter
To prevent dust from coming into the indoor unit. (Refer page 25)
Front panel
Indoor unit indicators
Light indicator showing the operating condition. (Refer page 9)
Horizontal deflector ● Vertical deflector
(Air Outlet)
(Refer page 20)
Remote controller
Send out operation signal to the indoor unit. So as to operate the whole unit.
(Refer page 10)
MODEL NAME AND DIMENSIONS
MODEL |
WIDTH (mm) |
HEIGHT (mm) |
DEPTH (mm) |
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RAK25NH4, RAK35NH4, RAK50NH4 |
860 |
295 |
183 |
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– 3 –
INDOOR UNIT INDICATORS
HITACHI
FILTER LAMP
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 POWER SWITCH set to OFF and ON again.
OPERATION LAMP
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.
TIMER LAMP
This lamp lights when the timer is working.
OPERATION INDICATOR
● This figure shows the opening condition of front panel. Refer to page 24 in relation to how to open or close the front panel.
TEMPORARY SWITCH
TEMPORARY SWITCH
TEMPORARY SWITCH
●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.
– 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 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.
˚CH
˚CH
RESET
AUTO
HEAT
DEHUMIDIFY
COOL
FAN
FAN SPEED
LOW
MED
HI
SLEEPING
STOP (CANCEL)
START (RESERVE)
START/STOP
TIME
TIMER SET
TIMER SELECTOR
ON TIMER
OFF TIMER
AUTO SWING
●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) (This button allows selecting the optimal or preferred fan speed for each operation mode).
●AUTO SWING button
Controls the angle of the horizontal air deflector.
●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 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.
– 5 –
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, COOL or DEHUMIDIFY depending on the initial room temperature. The selected mode of operation will not change when the room temperature varies.
RESET
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 initial room temperature.
1● If the mode automatically selected by the unit is not satisfactory, manually change the mode setting (heat, dehumidify, cool or fan).
START |
Press the (START/STOP) button. |
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Operation starts with a beep. |
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STOP |
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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.
You can raise or lower the temperature setting as necessary by maximum of 3°C.
° C |
Press the temperature button and the temperature setting will change by |
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1°C each time. |
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●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.
Press the 
(FAN SPEED) button, AUTO and LOW is available.
■ Condition of Automatic Operation
Initial room temperature (approx.)
Over 27°C
23~27°C
Under 23°C
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Function |
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COOL |
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HEAT |
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DEHUMIDIFY |
Temperature setting |
FAN SPEED |
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27°C |
HI at start, MED or LOW after the |
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preset temperature is reached |
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Slightly lower than the |
LOW |
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room temperature |
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23°C |
HI at start, MED or LOW after the |
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preset temperature is reached |
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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.
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Press the FUNCTION selector so that the display indicates |
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(HEAT). |
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Set the desired FAN SPEED with the (FAN SPEED) button |
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(the display indicates the setting). |
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(AUTO): The fan speed is HI at first and varies to MED |
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automatically when the preset temperature has |
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been reached. |
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(HI) |
: Economical as the room will become warm |
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quickly. |
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But you may feel a chill at the beginning. |
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: Fan speed slow. |
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(LOW) : Fan speed slower. |
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Set the desired room temperature with the TEMPERATURE |
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buttons (the display indicates the setting). |
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The temperature setting and the actual room temperature may |
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vary somewhat depending on conditions. |
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START |
Press the |
(START/STOP) button. Heating operation starts |
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with a beep. Press the button again to stop operation. |
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■ As the settings are stored in memory in the remote controller, you only |
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have to press the |
(START/STOP) button next time. |
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– 7 –
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