Hitachi RAS-18GH5, RAC-18GH5 Service Manual

NO. 0479E

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

ROOM AIR CONDITIONER

INDOOR UNIT + OUTDOOR UNIT

JANUARY 2011

Refrigeration & Air-Conditioning Division

SERVICE MANUAL

REFER TO THE FOUNDATION MANUAL

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY

(W)

(A)

(kW)

(B.T.U./h)

(W)

(A)

(kW)

(B.T.U./h)

(kg)

RAS-18GH5 RAC-18GH5

(WALL TYPE)

TYPE

MODEL

POWER SOURCE

TOTAL INPUT

TOTAL AMPERES

CAPACITY

TOTAL INPUT

TOTAL AMPERES

CAPACITY

DIMENSIONS (mm)

NET WEIGHT

SPECIFICATIONS

1030

295

207

RAS-18GH5

CONTENTS

SPECIFICATIONS ----------------------------------------------------- 5

HOW TO USE ---------------------------------------------------------- 9

CONSTRUCTION AND DIMENSIONAL DIAGRAM ---------30

MAIN PARTS COMPONENT --------------------------------------32

WIRING DIAGRAM ---------------------------------------------------34

CIRCUIT DIAGRAM --------------------------------------------------35

PRINTED WIRING BOARD LOCATION DIAGRAM --------37

BLOCK DIAGRAM ----------------------------------------------------39

BASIC MODE ----------------------------------------------------------41

REFRIGERATING CYCLE DIAGRAM --------------------------47

DESCRIPTION OF MAIN CIRCUIT OPERATION ----------48

AUTO SWING FUNCTION -----------------------------------------52

SERVICE CALL Q & A ---------------------------------------------53

TROUBLE SHOOTING ----------------------------------------------59

PARTS LIST AND DIAGRAM -------------------------------------62

RAS-18GH5/RAC-18GH5

RAC-18GH5

COOLING

HEATING

INDOOR UNIT OUTDOOR UNIT

1 Ø, 50 Hz, 220 ~ 230

1550 ~ 1580

7.42 ~ 7.23

5.10

17,410

1640 ~ 1680

7.77 ~ 7.61

5.75

19,630

850

650

298

After installation

– 1 –

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.

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. Modiﬁ cation 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 or more as measured by a 500V DC megger.

9. The initial location of installation such as window, ﬂ oor 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 inﬂ ammable thing should never be placed about the location of installation.

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.

DANGER

First, I must disconnect the power cord plug

from the power outlet.

– 2 –

WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS

1. Scope The standards provide for items to be generally observed in carrying and handling semiconductors in rela-

tive 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).

Fig. 1. Conductive Container

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

ways 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.

Fig. 2. Body Earth

Body earth (Elimik conductive band)

Clip for connection with a grounding wire

A conductive polyvinyl bag

Conductive sponge

– 3 –

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

Bare copper wire (for body earth)

Working table

Resistor of 1 M (1/2W)

Earth wire

Fig. 3. Grounding of the working table

Screw stop at the screwed part using a rag plate

Soldering iron

Grounding wire

Fig. 4. Grounding a soldering iron

Use a high insulation mode (100V, 10M or higher) when ordinary iron is to be used.

(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.

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

Staple

– 4 –

1. In quiet or stop operation, slight ﬂ owing 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 recommended to stop the operation and to disconnect the power cord plug from the power outlet for safety.

3. In the event of power failure, the air conditioner will restart automatically in the previously selected mode once the power is restored. In the event of power failure during TIMER operation, the timer will be reset and the unit will begin or stop operating under a new timer setting.

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 –10°C (14°F).

If the reverse cycle is used under this condition, the outside heat exchanger is frosted and efﬁ ciency 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.

CAUTION

– 5 –

RAC-18GH5

40 W

2.5 F,450V

YES (INTERNAL)

5KS205DAA

50 F, 450VAC

YES (INTERNAL)

YES(IC)

SPECIFICATIONS

MODEL

FAN MOTOR

FAN MOTOR CAPACITOR

FAN MOTOR PROTECTOR

COMPRESSOR

COMPRESSOR MOTOR CAPACITOR

OVERLOAD PROTECTOR

OVERHEAT PROTECTOR

FUSE (MICRO COMPUTER CIRCUIT)

POWER RELAY

POWER SWITCH

TEMPORARY SWITCH

SERVICE SWITCH

TRANSFORMER

VARISTOR

NOISE SUPPRESSOR

THERMOSTAT

REMOTE CONTROL SWITCH (LIQUID CRYSTAL)

FUSE CAPACITY

RAS-18GH5

30 W

–

3.15A

G4A

YES

450NR

YES(IC)

YES

20 A TIME DELAY FUSE

----------

❈ 1450g

UNIT

PIPES (MAX. 15m)

REFRIGERANT CHARGING VOLUME (Refrigerant R410A)

PIPES (MIN. 5m)

ADDITIONAL REFRIGERANT R410A AT 15g PER EVERY METER IF PIPE LENGTH MORE THAN 8m.

– 6 –

Figure showing the installation of Indoor and Outdoor unit

The installation height of indoor unit must be 2.3m or more in a non public area

CAUTION

The indoor piping should be insulated with the enclosed insulation pipe. (If the insulator is insufficient, please use commersial products).

inner diameter ø 16mm

The connection of insulated drain hose.

Please use insulated drain hose for the indoor piping (commercial product).

The difference in height

between the indoor and outdoor unit should be kept max 10m.

The connecting pipe,

no matter big or small, should all be insulated with insulation pipe and then warapped with vinyl tape. (The insulator will deteriorate if it is not wrapped with tape).

Figure showing the Installation of Indoor and Outdoor Unit.

Be sure to completely seal any gap with putty.

– 7 –

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.

Make sure to connect earth line.

Indicates the instructions that must be followed.

The sign in the ﬁ gure indicates prohibition.

PRECAUTIONS DURING OPERATION

● Avoid an extended period of direct air ﬂ ow for your health.

A R N

I N G

● Do not insert a ﬁ 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.

WARNING

PRECAUTIONS DURING INSTALLATION

●

Do not reconstruct the unit.

Water leakage, fault, short circuit or ﬁ re may occur if you reconstruct the unit by

yourself.

●

Please ask your sales agent or qualiﬁ ed technician for the installation of your unit.

Water leakage, short circuit or ﬁ 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.

●

Be sure to use the speciﬁ ed 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 near location where there is ﬂ ammable gas. The outdoor unit may

catch ﬁ re if ﬂ ammable gas leaks around it.

●

Please ensure smooth ﬂ ow of water when installing the drain hose.

CAUTION

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 ﬁ 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 ﬁ re.

● Please contact your agent if you need to remove and reinstall the unit. Electric

shock or ﬁ 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.

A R N

I N G

– 8 –

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 insufﬁ 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 place plants directly under the air ﬂ ow as it is bad for the plants.

● Please ensure that outdoor mounting frame is always stable, ﬁ 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 deﬂ ector facing down or moving automatically for a long period of time, water will condense on the air deﬂ 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.

C A U T

I O N

● The product shall be operated under the manufacturer speciﬁ 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 use any aerosol or hair sprays near the indoor unit. This chemical

can adhere on heat exchanger ﬁ n and blocked the evaporation water ﬂ ow to drain pan. The water will drop on tangential fan and cause water

splashing out from indoor unit.

– 9 –

INDOOR UNIT

NAMES AND FUNCTIONS OF EACH PART

Air ﬁ lter

To prevent dust from coming into the indoor unit. (Refer page 26)

Front panel

Indoor unit indicators

Light indicator showing the operating condition. (Refer page 10)

Horizontal deﬂ ector

●

Vertical deﬂ ector

(Air Outlet)

(Refer page 21)

Remote controller

Send out operation signal to the indoor unit. So as to operate the whole unit. (Refer page 11)

OUTDOOR UNIT

Drain pipe

Condensed water drain to outside.

Connecting cord and insulation pipe for piping

Air inlet (Back and Left side)

Air outlet

WIDTH (mm)

1030

850

MODEL

RAS-18GH5

RAC-18GH5

HEIGHT (mm)

295

650

DEPTH (mm)

207

298

MODEL NAME AND DIMENSIONS

– 10 –

INDOOR UNIT INDICATORS

AUTO RESTART SWITCH

● In the event of power failure, the air conditioner will restart automatically in the previously selected mode

once the power is restored.

● In the event of power failure during TIMER operation, the timer will be reset and the unit will begin or stop

operating under a new timer setting.

OPERATION INDICATOR

● This ﬁ gure shows the opening condition of

front panel. Refer to page 25 in relation to how to open or close the front panel.

OPERATION LAMP

This lamp lights during operation. The OPERATION LAMP ﬂ ashes 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.

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 ﬁ lter. The lamp goes out when the POWER SWITCH set to OFF and ON again.

HITACHI

– 11 –

● 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) (during the (FAN) mode, from HI to MED to LOW).

● AUTO SWING button

Controls the angle of the horizontal air deﬂ ector.

● 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.

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

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 ﬁ xed on a wall using the ﬁ xture provided. Before ﬁ xing it, make sure the indoor unit can be controlled from the remote controller.

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 ﬂ 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.

● If you press the FUNCTION selector button during operation, the

device may stop for about 3 minutes for protection.

– 12 –

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.

■ As the settings are stored in memory in the remote controller, you only have to press the (START/STOP) button next time.

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.

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

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.

● The display does not indicate the preset temperature in the AUTO mode.

If you change the setting, the indoor unit will produce a beep.

START

STOP

Over 27°C COOL

23~27°C

Under 23°C HEAT

Temperature settingFunction

27°C

23°C

Slightly lower than the room temperature

LOW

FAN SPEED

HI at start, MED or LOW after the preset temperature is reached

DEHUMIDIFY

Initial room temperature (approx.)

■ Condition of Automatic Operation

– 13 –

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 –10°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 ﬁ rst and varies to MED

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) : Quiet.

(LOW) : More quiet.

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

The range of 18-22°C is recommended as the room temperature for heating. If the temperature setting is 20°C, the room temperature will be controlled at around 20°C.

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.

■ As the settings are stored in memory in the remote controller, you only have to press the (START/STOP) button next time.

START

STOP

– 14 –

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, 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.

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.

Press the (START/STOP) button. Dehumidifying 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.

START

STOP

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.

– 15 –

COOLING OPERATION

Use the device for cooling when the outdoor temperature is 22-42°C. If indoor humidity is very high (over 80%), some dew may form on the air outlet grille of the indoor unit.

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

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

START

STOP

Press the FUNCTION selector so that the display indicates (COOL).

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

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

MED automatically when the preset temperature has been reached.

(HI) : Economical as the room will become cool quickly.

(MED) : Quiet.

(LOW) : More quiet.

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 some how depending on conditions.

Press the

(START/STOP) button. Cooling operation starts 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.

– 16 –

Press the FUNCTION selector so that the display indicates (FAN).

Press the (FAN SPEED) button.*

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

FAN SPEED (AUTO)

.....

When the AUTO fan speed mode is set in the cooling/heating operation:

For the 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.

● 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.

For the cooling operation

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.

START

STOP

– 17 –



HOW TO SET THE SLEEP TIMER

1 Set the ON-timer.

Set the current time at ﬁ rst if it is not set before (see the pages for setting the current time). Press the (SLEEP) button, and the display changes as shown below.

Mode

Sleep timer

Indication

1 hour 2 hours 3 hours 7 hours

Sleep timer off

44 44

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. When the sleep timer has been set, the display indicates the turn-off time.

Example: If you set 3 hours sleep time at 11:38 p.m., the turn-off time is 2:38 a.m.

2 Press the (SLEEP) button and set the sleep timer.

The device will be turned off by the sleep timer and turned on by on-timer.

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.

For heating:

In this case, the device will turn off in 2 hours (at 1:38 a.m.) and turn on early so that the preset temperature will be almost reached at 6:00 next morning.

SLEEP

– 18 –

1 Press the (OFF-TIMER)

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

HOW TO SET THE TIMER

ON/OFF-Timer

OFF-Timer

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

After you change the batteries;

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.

1 Set the current month and

day with the TIMER control button.

NOTE

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

ON-Timer

Time, Day, Month

● The device will turn on

at the designated times.

TIME, DAY, MONTH (current time, day, month)

OFF TIMER

ON TIMER

RESERVE

CANCEL

Start Stop

1 Press the (ON-TIMER)

button the (ON) mark blinks on the display.

1 Press the (ON-OFF)

button so that the (OFF) mark blinks.

2 Set the turn-off time

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

3 Press the (ON-

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

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

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

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

+ 42 hidden pages

Hitachi RAS-18GH5, RAC-18GH5 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual