Hitachi RAI-25NH5, RAI-35NH5 Service Manual

SERVICE MANUAL

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY

RAI-ECPM RAI-25NH5 RAI-35NH5

NOTE:

This manual describes only points that differ from

RAK-18NH5, 25NH5, 35NH5 (PM NO. 0269E) and

RAM-40QH5 (PM NO. 0270E) for items not described

in this manual.

NO. 0271E

RAI-25NH5 RAI-35NH5

REFER TO THE FOUNDATION MANUAL

CONTENTS

SPECIFICATIONS ------------------------------------------------------------------- 4

HOW TO USE ------------------------------------------------------------------------ 6

CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 27

MAIN PARTS COMPONENT --------------------------------------------------- 28

WIRING DIAGRAM ---------------------------------------------------------------- 29

CIRCUIT DIAGRAM --------------------------------------------------------------- 31

PRINTED WIRING BOARD LOCATION DIAGRAM --------------------- 35

BLOCK DIAGRAM ----------------------------------------------------------------- 37

BASIC MODE ----------------------------------------------------------------------- 39

REFRIGERATING CYCLE DIAGRAM --------------------------------------- 53

AUTO SWING FUNCTION ------------------------------------------------------ 55

DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 56

SERVICE CALL Q & A ---------------------------------------------------------- 61

TROUBLE SHOOTING ----------------------------------------------------------- 64

PARTS LIST AND DIAGRAM -------------------------------------------------- 69

SPECIFICATIONS

TYPE

MODEL

POWER SOURCE

TOTAL INPUT

COOLING

HEATING

DIMENSIONS (mm)

NET WEIGHT

TOTAL AMPERES

CAPACITY

TOTAL INPUT

TOTAL AMPERES

CAPACITY

1 PHASE, 50 Hz, 220-240V

(W)

(A)

(kW)

(B.T.U./h)

(W)

(A)

(kW)

(B.T.U./h)

(kg)

DC INVERTER (CEILING CASSETTE TYPE)

INDOOR UNIT

RAI-25NH5

1 PHASE, 50 Hz, 220-240V

REFER TO THE SPECIFICATIONS PAGE (5)

580

285

580

RAI-35NH5

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

580

285

580

ROOM AIR CONDITIONER

SEPTEMBER 2005

Refrigeration & Air-Conditioning Division

INDOOR UNIT

SAFETY DURING REPAIR WORK

1. In order to disassemble and repair the unit in question, be sure to disconnect the power cord plug from the power outlet before starting the work.

2. If it is necessary to replace any parts, they should be replaced with respective genuine parts for the unit, and the replacement must be effected in correct manner according to the instructions in the Service Manual of the unit.

If the contacts of electrical parts are defective, replace the electrical parts without trying to repair them.

First, I must disconnect the power cord plug

from the power outlet.

3. After completion of repairs, the initial state should be restored.

4. Lead wires should be connected and laid as in the initial state.

5. Modification of the unit by user himself should absolutely be prohibited.

6. Tools and measuring instruments for use in repairs or inspection should be accurately calibrated in advance.

7. In installing the unit having been repaired, be careful to prevent the occurence of any accident such as electrical shock, leak of current, or bodily injury due to the drop of any part.

8. To check the insulation of the unit, measure the insulation resistance between the power cord plug and grounding terminal of the unit. The insulation resistance should be 1M DC megger.

9. The initial location of installation such as window, floor or the other should be checked for being and safe enough to support the repaired unit again. If it is found not so strong and safe, the unit should be installed at the initial location reinforced or at a new location.

10. Any inflammable thing should never be placed about the location of installation.

or more as measured by a 500V

DANGER

11. Check the grounding to see whether it is proper or not, and if it is found improper, connect the grounding terminal to the earth.

– i –

WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS

1. Scope The standards provide for items to be generally observed in carrying and handling semiconductors in relative manufacturers during maintenance and handling thereof. (They apply the same to handling of abnormal goods such as rejected goods being returned).

2. Object parts

(1) Micro computer (2) Integrated circuits (IC) (3) Field-effect transistors (FET) (4) P.C. boards or the like on which the parts mentioned in (1) and (2) of this paragraph are equipped.

3. Items to be observed in handling

(1) Use a conductive container for carrying and storing of parts. (Even rejected goods should be handled in

the same way).

A conductive polyvinyl bag

Fig. 1. Conductive Container

(2) When any part is handled uncovered (in counting, packing and the like), the handling person must always

use himself as a body earth. (Make yourself a body earth by passing one M ohm earth resistance through a ring or bracelet).

(3) Be careful not to touch the parts with your clothing when you hold a part even if a body earth is being

taken.

(4) Be sure to place a part on a metal plate with grounding.

(5) Be careful not to fail to turn off power when you repair the printed circuit board. At the same time, try

to repair the printed circuit board on a grounded metal plate.

Conductive sponge

Body earth (Elimik conductive band)

Fig. 2. Body Earth

Clip for connection with a grounding wire

– 1 –

(6) Use a three wire type soldering iron including a grounding wire.

Metal plate (of aluminium, stainless steel, etc.)

Working table

Bare copper wire (for body earth)

Staple

Fig. 3. Grounding of the working table

Soldering iron

Resistor of 1 M

Earth wire

Grounding wire

(1/2W)

Screw stop at the screwed part using a rag plate

Fig. 4. Grounding a soldering iron

Use a high insulation mode (100V, 10M

(7) In checking circuits for maintenance, inspection or some others, be careful not to have the test probes of the

measuring instrument shortcircuit a load circuit or the like.

or higher) when ordinary iron is to be used.

– 2 –

CAUTION

1. In quiet operation or stopping the running, slight flowing noise of refrigerant in the refrigerating cycle is

heard occasionally, but this noise is not abnormal for the operation.

2. When it thunders near by, it is recommend to stop the operation and to disconnect the power cord plug

from the power outlet for safety.

3. The room air conditioner does not start automatically after recovery of the electric power failure for

preventing fuse blowing. Re-press START/STOP button after 3 minutes from when unit stopped.

4. If the room air conditioner is stopped by adjusting thermostat, or missoperation, and re-start in a moment,

there is occasion that the cooling and heating operation does not start for 3 minutes, it is not abnormal and this is the result of the operation of IC delay circuit. This IC delay circuit ensures that there is no danger of blowing fuse or damaging parts even if operation is restarted accidentally.

5. This room air conditioner should not be used at the cooling operation when the outside temperature is

below 10°C (50°F).

6. This room air conditioner (the reverse cycle) should not be used when the outside temperature is below

–15°C (5°F). If the reverse cycle is used under this condition, the outside heat exchanger is frosted and efficiency falls.

7. When the outside heat exchanger is frosted, the frost is melted by operating the hot gas system, it is not

trouble that at this time fan stops and the vapour may rise from the outside heat exchanger.

– 3 –

SPECIFICATIONS

MODEL

FAN MOTOR

FAN MOTOR CAPACITOR

FAN MOTOR PROTECTOR

COMPRESSOR

COMPRESSOR MOTOR CAPACITOR

OVERLOAD PROTECTOR

OVERHEAT PROTECTOR

FUSE (for MICROPROCESSOR)

POWER RELAY

RAI-25NH5 RAI-35NH5

25W

–

POWER SWITCH

TEMPORARY SWITCH

SERVICE SWITCH

TRANSFORMER

VARISTOR

NOISE SUPPRESSOR

THERMOSTAT

REMOTE CONTROL SWITCH (LIQUID CRYSTAL)

REFRIGERANT CHARGING VOLUME (Refrigerant 410A)

UNIT

PIPES

YES

YES(IC)

YES

----------

WITHOUT REFRIGERANT BECAUSE

COUPLING IS FLARE TYPE.

– 4 –

SPECIFICATIONS FOR INDOOR UNITS COMBINATIONS

CEILING CASSETTE TYPE DC INVERTER QUADRUPLE SYSTEM MULTI COOLING AND HEATING

RAI-25NH5 RAI-35NH5

2.50 (1.00 ~ 3.00)

8540 (3412~10236)

750 (200-880)

11.39

3.44 ~ 3.16

8.5m3/min

3.40 (1.10 ~ 4.40)

11610 (3761~15026)

870 (200-1120)

13.34

3.99 ~ 3.66

8.5m

YES (AUTO SWING)

NOT PROVIDED (POWER CORD SHOULD BE PREPARED AND CONNECTED TO OUTDOOR UNIT WHEN INSTALLED)

YES (WIRELESS) YES (WIRELESS)

MODEL

CIRCUIT AMPERES TO CONNECT (A)

COOLING

(ONE UNIT)

COOLING

(TWO UNITS)

HEATING

(ONE UNIT)

HEATING

(TWO UNITS)

TYPE

INDOOR UNIT

OUTDOOR UNIT

PHASE/VOLTAGE/FREQUENCY

CAPACITY (kW)

(B.T.U./h)

TOTAL INPUT (W)

EER (B.T.U./hW)

TOTAL AMPERES (A)

POWER FACTOR (%)

SOUND LEVEL (INDOOR)

AIR FLOW VOLUME (Hi)

CAPACITY (kW)

(B.T.U./h)

TOTAL INPUT (W)

EER (B.T.U./hW)

TOTAL AMPERES (A)

POWER FACTOR (%)

SOUND LEVEL (OUTDOOR)

CAPACITY (kW)

(B.T.U./h)

TOTAL INPUT (W)

EER (B.T.U./hW)

TOTAL AMPERES (A)

POWER FACTOR (%)

SOUND LEVEL (INDOOR)

AIR FLOW VOLUME (Hi)

CAPACITY (kW)

(B.T.U./h)

TOTAL INPUT (W)

EER (B.T.U./hW)

TOTAL AMPERES (A)

POWER FACTOR (%)

SOUND LEVEL (OUTDOOR)

AIR DEFLECTORS

FAN SPEED

LINE CORD

REMOTE CONTROL SWITCH

MAXIMUM LENGTH OF PIPING

STANDARD

RAM-40QH5

1ø, 220V-240V, 50Hz

11950 (3412~13660)

4.00 (1.50 ~ 4.50)

13660 (5126~15367)

1245 (200-1800)

10.97

5.72 ~ 5.24

14340 (3761~17070)

/min

5.00 (1.50 ~ 5.60)

17070 (5126~19122)

1350 (200-1780)

12.64

6.20 ~ 5.68

YES (AUTO SWING)

MAX. 35m (TWO UNITS TOTAL)

CE (EMC&LVD)

3.50 (1.00 ~ 4.00)

1090 (200-1300)

10.96

5.00 ~ 4.59

10.8m3/min

4.20 (1.10 ~ 5.00)

1080 (200-1300)

13.28

4.96 ~ 4.55

/min

10.8m

MODEL

PACKING (mm)

cu.ft.

GROSSWEIGHT (kg)

FLARENUTSIZE (SMALL/LARGE)

RAI-25NH5

760

395

706

7.48

6.35/9.52D

– 5 –

RAI-35NH5

760

395

706

7.48

6.35/9.52D

RAM-40QH5

905

633

394

8.27

6.35/9.52D, 6.35/9.52D

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.

Indicates the instructions that must be followed.

●

Please keep this manual after reading.

PRECAUTIONS DURING INSTALLATION

●

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

WARNING

CAUTION

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.

●

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 flammable gas. The outdoor unit may catch fire if flammable gas leaks around it.

●

Please ensure smooth flow of water when installing the drain hose.

The sign in the figure indicates prohibition.

A R N

N G

A R N

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 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.

PRECAUTIONS DURING OPERATION

●

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

●

Do not insert a finger, 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.

●

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

●

During thunder storm, disconnect and turn off the circuit breaker.

– 6 –

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.

C A U T

●

Do not use any aerosol or hair sprays near the indoor unit. This chemical can adhere on heat exchanger fin and blocked the evaporation water flow to drain pan. The water will drop on tangential fan and cause water splashing out from indoor unit.

O N

●

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.

●

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

●

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 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 the appliance safely.

●

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

– 7 –

NAMES AND FUNCTIONS OF EACH PART

INDOOR UNIT

AIR FILTER

To prevent dust from coming into the indoor unit. (Refer page 23)

INDOOR UNIT INDICATORS

Light indicator showing the operating condition. (Refer page 9)

SUCTION GRILL (AIR INLET)

HORIZONTAL DEFLECTOR (AIR OUTLET)

(Refer page 19)

REMOTE CONTROL

Send out operation signal to the indoor unit. So as to operate the whole unit. (Refer page 10)

MODEL NAME AND DIMENSIONS

MODEL

RAI-25NH5 / RAI-35NH5

WIDTH (mm)

580

HEIGHT (mm)

285

DEPTH (mm)

580

MULTI-AIR CONDITIONER

With this multi-air conditioner, several indoor units can be connected to one outdoor unit to be driven. You can operate the required number of indoor units.

Combination of Operations:

When operation mode is selected:

● You cannot operate the indoor units in the

following combinations.

One unit

Heating

During automatic operation:

● 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.

Other unit

Cooling

Dehumidifying

Circulating (fan)

● The indoor unit which is switched on first continues to

operate, but other indoor units which is switched on later does not operate while the lamp lights.

● To re-start an indoor unit which was operated later, stop

the indoor unit which was operated first or later and reset the type of operation, then perform operation again.

Adjusting the Number of Indoor Units:

Decrease the number of indoor units to be operated especially when it is very hot or cold or when you want to reach the present temperature quickly.

Stopped Indoor Units:

When an indoor unit is operated in the cooling, heating or dehumidifying mode in the 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.

– 8 –

OPERATION INDICATOR

TEMPORARY SWITCH

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 will be done in automatic mode.

INDOOR UNIT INDICATORS

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.

Press

Nonconducted stick

Temporary Switch

about 5.5mm

– 9 –

TIMER LAMP

This lamp lights when the timer is working.

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 filter. The lamp goes out when the “ (AUTO SWING)” button is pressed while the device is on “STANDBY MODE”.

NAMES AND FUNCTIONS OF REMOTE CONTROL UNIT

REMOTE CONTROLLER

● Operate by pointing towards the signal receptor on the indoor unit. The range of control is

about 7 meters. Signal receivable angle range is approximately 70°. However, if there is an electronic light sensor device (inverter) in the room, signal may not be received or receivable distance may become shorter.

● Indoor unit must be install 1 meter or more away from lighting.

● 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.

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

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.

▲

Approximately 70°

– 10 –

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 or OFF by remote control.

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 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.

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).

RESET

START

STOP

Press the (START/STOP) button. 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.

You can raise or lower the temperature setting as necessary by maximum of 3°C.

°C

● 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.

Press the temperature button and the temperature setting will change by 1°C each time.

– 11 –

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 is HI at first and varies to

MED or LOW automatically when the preset temperature has been reached.

(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.

RESET

Set the desired room temperature with the TEMPERATURE buttons (the display indicates the setting).

START

STOP

■ As the settings are stored in memory in the remote controller, you only

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.

have to press the (START/STOP) button next time.

– 12 –

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.

Press the FUNCTION selector so that the display indicates

(DEHUMIDIFY). The FAN SPEED is set at LOW automatically. The FAN SPEED button does not work.

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.

RESET

■ Dehumidifying Function

START

STOP

■ As the settings are stored in memory in the remote controller, you

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

only have to press the

(START/STOP) button next time.

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.

– 13 –

COOLING OPERATION

Use the device for cooling when the outdoor temperature is 22-42°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).

RESET

Set the desired FAN SPEED with the (the display indicates the setting).

(AUTO): The FAN SPEED is HI at first and varies to

MED or LOW automatically when the preset

(HI) : Economical as the room will become cool

(MED) : Fan speed slow.

(LOW) : Fan speed slower.

Set the desired room temperature with the TEMPERATURE button (the display indicates the setting).

START

STOP

The temperature setting and the actual room temperature may vary some how depending on conditions.

Press the 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.

temperature has been reached.

quickly.

(START/STOP) button. Cooling operation starts

(FAN SPEED) button

■ As the settings are stored in memory in the remote controller, you

only have to press the

(START/STOP) button next time.

– 14 –

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).

RESET

FAN SPEED (AUTO)

For the heating operation

START

STOP

.....

When the AUTO fan speed mode is set in the cooling/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.

Press the (FAN SPEED) button.

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

For the cooling operation

● 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.

– 15 –

HOW TO SET THE TIMER

RESET

Time, Day, Month

TIME, DAY, MONTH (current time,

After you change the batteries;

day, month)

OFF TIMER

ON TIMER

OFF-Timer

RESERVE

CANCEL

You can set the device to turn off at the present time.

ON-Timer

● The device will turn on

at the designated times.

Start

M D

STOP

Stop

Start

Set the current month and

day with the TIMER control button.

M D

Press the (OFF-TIMER)

button. The (OFF) mark blinks on the display.

Press the (ON-TIMER)

button the (ON) mark blinks on the display.

ON/OFF-Timer

Start Stop

● The device will turn on (off) and off (on) at the designated times.

● The switching occurs first at the preset time that comes earlier.

● The arrow mark appearing on the display indicates the sequence of switching operations.

Press the (ON-OFF)

button so that the (OFF) mark blinks.

Set the turn-off time

with the TIMER control button. Press the (RESERVE) button.

Press the (ON-

TIMER) button so that the (OFF) mark lights and the (ON) mark blinks.

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.

NOTE

You can set only one of the OFF-timer, ON-timer and ON/OFF-timer.

– 16 –

Press the

(TIME) button.

AM PM PM

Set the turn-off time with the

TIMER control button.

Set the current time with the

Example: The current time is 1:30 p.m.

Point the signal window of the remote controller toward the indoor unit, and

press the (RESERVE) button. The (OFF) mark starts lighting instead of flashing and the sign (RESERVED) lights. A beep occurs and the (TIMER) lamp lights on the indoor unit.

Press the (TIME) button again.

The time indication starts lighting instead of flashing.

● The time indication will disappear

● To check the current time setting,

automatically in 10 second.

press the (TIME) button twice.

The setting of the current time is now complete.

Set the turn-on time with the

TIMER control button.

Set the turn-on time with the

TIMER control button.

The setting of turn-off time is now complete.

Point the signal window of the remote controller toward the indoor unit, and

press the (RESERVE) button. The (ON) mark starts lighting instead of flashing and the (RESERVED) sign lights. A beep occurs and the (TIMER) lamp lights on the indoor unit.

Example:

Point the signal window of the remote controller toward the indoor unit, and

press the (RESERVE) button. The (ON) mark starts lighting instead of flashing and the (RESERVED) sign lights. A beep occurs and the (TIMER) lamp lights on the indoor unit.

The device will turn on at 7:00 a.m. The setting of the turn-on time is now complete.

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.

Example: The device will turn off at 11:00p.m.

● The timer may be used in three ways: off-timer, on-timer, and ON/OFF (OFF/ON)-timer. Set

the current time at first 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.

– 17 –

+ 43 hidden pages

Hitachi RAI-25NH5, RAI-35NH5 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual