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

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Page 1

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

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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.

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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

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(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

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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

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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.

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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.

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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

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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.

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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

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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

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● 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.

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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

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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.

● 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

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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.

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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.

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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

Page 18

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

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

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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.

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● The time indication will disappear

automatically in 10 second.

● To check the current time setting,

press the (TIME) button twice.

The setting of the current time is

now complete.

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

Set the current time at ﬁ rst 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.

2 Press the

(TIME) button.

3 Set the current time with the

TIMER control button.

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

The setting of turn-off time is now complete.

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

Example: The device will automatically turn on earlier so that the preset temperature can be reached at 7:00 a.m. The setting of the turn-on time is now complete.

2 Set the turn-on time with the

TIMER control button.

Example: The device will turn off at 10:30 p.m. and then automatically turn on earlier so that the preset temperature can be reached at 7:00 a.m. The settings of the turn-on/off times are now complete.

4 Press the (TIME) button again.

The time indication starts lighting instead of ﬂ ashing.

PM PM

2 Set the turn-off time with the

TIMER control button.

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

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

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

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

4 Set the turn-on time with the

TIMER control button.

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

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

Page 21

– 20 –

Cooling

“ ”

and

dehumidifying

“ ”

Explanation of the sleep timer

The device will control the FAN SPEED and room temperature automatically so as to be quiet and good for people’s health. You can set the sleep timer to turn off after 1, 2, 3 or 7 hours. The FAN SPEED and room temperature will be controlled as shown below.

Function Operation

The settings of room temperature and circulation are varied.

The room temperature will be controlled 2°C above the temperature and the FAN SPEED will be set to LOW setting 30 minutes after the setting of the sleep timer.

Fan

“ ”

Heating

“ ”

The room temperature will be controlled 5°C below the temperature and the FAN SPEED will be set to LOW setting 30 minutes after the setting of the sleep timer.

Operation with the sleep timer

● If date or current time is not set, sleep timer can not be set.

● If you set the sleep timer after the off-, on/off- or off/on-timer has been set, the sleep timer

becomes effective instead of the off-, on/off- or off/on-timer set earlier.

● You can not set other timer during sleep timer operation.

● After sleep timer time is up and when press sleep button again, the sleep timer will be set

as last setting.

● Sleep timer effective only once.

NOTE

Page 22

– 21 –

ADJUSTING THE AIR DEFLECTOR

Adjustment of the conditioned air to the left and right.

Hold the vertical air deﬂ ector as shown in the ﬁ gure and adjust the conditioned air to the left and right.

● If the “ (AUTO SWING)” button is pressed once,

the horizontal air deﬂ ector swings up and down. If the button is pressed again, the deﬂ ector stops in its current position. Several seconds (about 6 seconds) may be required before the deﬂ ector starts to move.

● Use the horizontal air deﬂ ector within the adjusting range

shown on the right.

● When the operation is stopped, the horizontal air deﬂ ector

moves and stops at the position where the air outlet closes.

When cooling dehumidifying

When heating

CAUTION

● In “Cooling” operation, do not keep the horizontal air

deﬂ ector swinging for a long time. Some dew may form on the horizontal air deﬂ ector and dew may drop.

RESET

Adjustment of the conditioned air in the upward and downward directions.

The horizontal air deﬂ ector is automatically set to the proper angle suitable for each operation. The deﬂ ector can be swung up and down continuously and also set to the desired angle using the “ (AUTO SWING)” button.

CAUTION

When operating the unit in cooling operation with the air deﬂ ector facing down and moving automatically for a long period of time, water will condensed on the air deﬂ ector and drips down occasionally. This will wet your furniture.

Page 23

– 22 –

HOW TO EXCHANGE THE BATTERIES IN THE REMOTE CONTROLLER

Remove the cover as shown in the ﬁ gure and take out the old batteries.

Install the new batteries. The direction of the batteries should match the marks in the case.

1. Do not use new and old batteries, or different kinds of batteries together.

2. Take out the batteries when you do not use the remote controller for 2 or 3 months.

CAUTION

Push and pull to the direction of arrow

Page 24

– 23 –

Suitable Room Temperature Install curtain or blinds

Ventilation Effective Usage Of Timer

Do Not Forget To Clean The Air Filter

Please Adjust Suitable Temperature

For Baby And Children

Warning

Freezing temperature is bad for health and a waste of electric power.

It is possible to reduce heat entering the room through windows.

At night, please use the “OFF or ON timer operation mode”, together with your wake up time in the morning. This will enable you to enjoy a comfortable room temperature. Please use the timer effectively.

Dusty air ﬁ lter will reduce the air volume and the cooling efﬁ ciency. To prevent from wasting electric energy, please clean the ﬁ lter every 2 weeks.

Please pay attention to the room temperature and air ﬂ ow direction when operating the unit for baby, children and old folks who have difﬁ culty in movement.

Caution

Do not close the room for a long period of time. Occasionally open the door and windows to allow the entrance of fresh air.

THE IDEAL WAYS OF OPERATION

Page 25

– 24 –

FOR USER’S INFORMATION

The Air Conditioner And The Heat Source In The Room

Not Operating For A Long Time

When Lightning Occurs

Caution

If the amount of heat in the room is above the cooling capability of the air conditioner (for example: more people entering the room, using heating equipments and etc.), the preset room temperature cannot be achieved.

When the indoor unit is not to be used for a long period of time, please switch off the power from the mains. If the power from mains remains “ON”, the indoor unit still consumes about 8W in the operation control circuit even if it is in “OFF” mode.

Warning

To protect the whole unit during lightning, please stop operating the unit and remove the plug from the socket.

OFF

Interference From Electrical Products

Caution

To avoid noise interference, please place the indoor unit and its remote controller at least 1m away from electrical products.

Inverter-type fluorescent lamp.

To prevent interference, place at least 1m away.

Page 26

– 25 –

ATTACHING THE AIR PURIFYING FILTERS

Open the front panel.

● Pull up the front panel by holding it at both sides

with both hands.

Remove the ﬁ lter.

● Push upward to release the claws and pull out the

ﬁ lter.

Attaching the air cleansing and deodorizing ﬁ lters to the ﬁ lter.

● Attach the air cleansing and deodorizing ﬁ lters to

the frame by gently compress its both sides and release after insertion into ﬁ lter frame.

Attach the ﬁ lters.

● Attach the ﬁ lters by ensuring that the surface written

“FRONT” is facing front.

● After attaching the ﬁ lters, push the front panel at

three arrow portion as shown in ﬁ gure and close it.

Cleaning and maintenance must be carried out only by qualiﬁ ed service personal. Before cleaning, stop operation and switch off the power supply.

CAUTION

Do not bend the air cleansing and deodorizing ﬁ lter as it may cause damage to the structure.

NOTE

● In case of removing the air cleansing and deodorizing ﬁ lters, please follow the above procedures.

● The cooling capacity is slightly weakened and the cooling speed becomes slower when the air cleansing

and deodorizing ﬁ lters are used. So, set the fan speed to "HIGH" when using it in this condition.

● Air cleansing and deodorizing ﬁ lters are washable and reusable up to 20 times by using vacuum

cleaner or water rinse under running tap water. Type number for this air cleansing filter is <SPX-CFH5>. Please use this number for ordering when you want to renew it.

● Do not operate the air conditioner without ﬁ lter. Dust may enter the air conditioner and fault may

occur.

Claws

(4 places)

Page 27

– 26 –

MAINTENANCE

Cleaning and maintenance must be carried out only by qualiﬁ ed service personal. Before cleaning, stop operation and switch off the power supply.

1. PRE-FILTER

Clean the pre-ﬁ lter, as it removes dust inside the room. In case the pre-ﬁ lter is full of dust, the air ﬂ ow will decrease and the cooling capacity will be reduced. Further, noise may occur. Be sure to clean the ﬁ lter following the procedure below.

CAUTION

Open the front panel and remove the pre-ﬁ lter

● Gently lift and remove the air cleansing and

purifying ﬁ lter from the pre-ﬁ lter frame.

Vacuum dust from the pre-ﬁ lter and air purifying ﬁ lter using vacuum cleaner. If there is too much

dust, rinse under running tap water and gently brush it with soft bristle brush. Allow ﬁ lters to dry in shade.

● Re-insert the air purifying ﬁ lter to the ﬁ lter

frame. Set the ﬁ lter with “FRONT” mark facing front, and slot them into the original state.

● After attaching the ﬁ lters, push the front panel

at three arrow portions as shown in ﬁ gure and close it.

CAUTION

● Do not wash with hot water at more than 40°C. The ﬁ lter may shrink.

● When washing it, shake off moisture completely and dry it in the shade; do not expose it directly

to the sun. The ﬁ lter may shrink.

● Do not use detergent on the air purifying ﬁ lter as some detergent may deteriorate the ﬁ lter electrostatic

performance.

PROCEDURE

NOTE:

● Air purifying ﬁ lter should be cleaned every month or sooner if noticeable loading occurs. When used

overtime, it may loose its deodorizing function. For maximum performance, it is recommended to replace it every 3-6 months depending on application requirements.

Page 28

– 27 –

2. Washable Front Panel

● Remove the front panel and wash with clean

water. Wash it with a soft sponge. After using neutral detergent, wash thoroughly

with clean water.

● When front panel is not removed, wipe it with

a soft dry cloth. Wipe the remote controller

thoroughly with a soft dry cloth.

● Wipe the water thoroughly.

If water remains at indicators or signal

receiver of indoor unit, it causes trouble.

Method of removing the front panel. Be sure to hold the front panel with both

hands to detach and attach it.

CAUTION

● Do not splash or direct water to the body of the unit when cleaning

it as this may cause short circuit.

● Never use hot water (above 40°C), benzine, gasoline, acid, thinner

or a brush, because they will damage the plastic surface and the coating.

Removing the Front Panel

Arm

● When the front panel is fully opened with both

hands, push the right arm to the inside to

release it, and while closing the front panel

slightly, put it out forward.

Attaching the Front Panel

● Move the projections of the left and right arms

into the Flanges in the unit and securely insert them into the holes.

Projection

Hole

Flange

Page 29

– 28 –

3. MAINTENANCE AT BEGINNING OF LONG OFF PERIOD

● Run the unit by setting the operation mode to

(COOL), the temperature to 32°C and the fan speed

to HI for about half a day on a ﬁ ne day, and dry the whole of the unit.

● Switch off the power plug.

REGULAR INSPECTION

PLEASE CHECK THE FOLLOWING POINTS BY QUALIFIED SERVICE PERSONAL EITHER EVERY HALF YEARLY OR YEARLY. CONTACT YOUR SALES AGENT OR SERVICE SHOP.

Is the earth line disconnected or broken?

Is the mounting frame seriously affected by rust and is the outdoor unit tilted or unstable?

Is the plug of power line ﬁ rmly plugged into the socket? (Please ensure no loose contact between them).

Cleaning and maintenance must be carried out only by qualiﬁ ed service personal. Before cleaning, stop operation and switch off the power supply.

CAUTION

Confirm

Page 30

– 29 –

AFTER SALE SERVICE AND WARRANTY

WHEN ASKING FOR SERVICE, CHECK THE FOLLOWING POINTS.

When it does not operate

● Is the fuse all right?

● Is the voltage extremely high or low?

● Is the circuit breaker “ON”?

● Was the air ﬁ lter cleaned?

● Does sunlight fall directly on the outdoor unit?

● Is the air ﬂ ow of the outdoor unit obstructed?

● Are the doors or windows opened, or is there any source

of heat in the room?

● Is the set temperature suitable?

CONDITION CHECK THE FOLLOWING POINTS

Notes

● In quiet operation or stopping the operation, the following phenomena

may occassionally occur, but they are not abnormal for the operation.

(1) Slight ﬂ owing noise of refrigerant in the refrigerating cycle. (2) Slight rubbing noise from the fan casing which is cooled and then

gradually warmed as operation stops.

● The odor will possibly be emitted from the room air conditioner because

the various odor, emitted by smoke, foodstuffs, cosmetics and so on, sticks to it. So the air ﬁ lter and the evaporator regularly must be cleaned to reduce the odor.

● Please contact your sales agent immediately if the air conditioner still fails to operate normally after the above

inspections. Inform your agent of the model of your unit, production number, date of installation. Please also inform him regarding the fault.

● Power supply shall be connected at the rated voltage, otherwise the unit will be broken or could not reach

the speciﬁ ed capacity.

When it does not cool well When it does not hot well

Please note: On switching on the equipment, particularly when the room light is dimmed, a slight brightness ﬂ uctuation may occur. This is of no consequence. The conditions of the local Power Supply Companies are to be observed.

Minimum Maximum Minimum Maximum Indoor Dry bulb °C 21 32 20 27 Wet bulb °C 15 23 12 19 Outdoor Dry bulb °C 21 43 2 21 Wet bulb °C 15 26 1 15

Note

● Avoid to use the room air conditioner for cooling operation when the outside temperature is below

21°C (70°F).

The recommended maximum and minimum operating temperatures of the hot and cold sides

should be as below:

Cooling Heating

Page 31

– 30 –

CONSTRUCTION AND DIMENSIONAL DIAGRAM

MODEL RAS-18GH5

Note:

1. Servicing space of 100mm or more is required on the left and right sides of the indoor unit and also 50mm or more space is required above the unit

2. Insulated pipes should be used for both the narrow and wide dia. pipes.

3. Piping length is within 15m

4. Height different of the piping between the indoor unit and the outdoor unit should be within 10m.

5. Power supply cord length is about 2m

6. Connecting cable 2.5mm dia. x 3 (AB Line), 1.6mm dia. x 2 (CD Line) is used for the connection.

1019

Top air suction grille

147

380

About

350

31 120.5

56 17.5

60 60

7070

158

263 317450

Drain outlet

Connecting cable

Power cord

Hole on the wall for ø 65mm pipe

Drain cap connection port

Narrow pipe

Wide pipe

Drain

Drain hose

View from back

(Pipe lead-out)

When piping is drawn horizontally, exchange the drain hose for the drain cap

6.5

Front cover

295

Vertical deflector

Horizontal deflector

Discharge grille

1030

191

207

6.5

Page 32

– 31 –

MODEL RAC-18GH5

Note:

1. 200mm or more servicing space is required above the outdoor unit.

Page 33

– 32 –

MAIN PARTS COMPONENT

THERMOSTAT (Room Temperature Thermistor)

Thermostat Speciﬁ cations

FAN MOTOR

Fan Motor Speciﬁ cations

CONNECTION

INDICATION

MODEL RAS-18GH5

THERMOSTAT MODEL IC

OPERATION COOL HEAT

ON 17.6 (63.7) 19.6 (67.3)

OFF 17.3 (63.1) 19.3 (66.7)

ON 25.6 (78.1) 27.6 (81.7)

OFF 25.3 (77.5) 27.3 (81.1)

ON 33.6 (92.5) 35.6 (96.1)

OFF 33.3 (91.9) 35.3 (95.5)

MODEL RAS-18GH5

RAC-18GH5

PHASE

RATED VOLTAGE

– – – – –

SINGLE

RATED FREQUENCY

DC35V

220-230V

TEMPERATURE °C

OUTPUT

POLE NUMBER

– – – – –

30 W

40 W

– – – – –

50 Hz

35V

RED

YELLOW

BLUE

RESISTANCE VALUE

( )

20°C

75°C

– – – – –

RM = 122.4

RA = 114.8

RM = 161.6

RA = 139.6

Page 34

– 33 –

MODEL RAC-18GH5

COMPRESSOR MODEL 5KS205DAA

PHASE SINGLE

RATED VOLTAGE 220 ~ 230 V

RATED FREQUENCY 50 Hz

LOCKED ROTOR CURRENT 26.0 ~ 28.0

POLE NUMBER 2

COMPRESSOR MOTOR

Compressor Motor Speciﬁ cations

CONNECTION

20°C

(68°F)

75°C

(167°F)

( )

RESISTANCE VALUE

CAUTION

When the Air Conditioner has been operated for a long time with the capillary tubes clogged or crushed or with too little refrigerant, check the color of the refrigerant oil inside the compressor. If the color has been changed conspicuously, replace the compressor.

EXTERNAL OVERLOAD RELAY

INTERNAL PROTECTOR

YES

ORANGE

WHITE

PROTECTOR

RED

CAPACITOR

S (RED)

C (WHITE)

R (ORANGE)

RAC-18GH5

RM = 1.780

RA = 2.175

RM = 2.16

RA = 2.64

Page 35

– 34 –

3.15A

R OR V

ORG

S OR X

C OR U

RED

GRY

BLK

BLU

WHT

BLU

CN4

BRN

RED

CONNECTING

CORD

WHT

BRN

RED

BLK

GRN+YEL

CN13

CN15

CN16

CN14

SWITCHING POWER P.C.B.

GRN

C1C2M1M2

GRY

4 LINES

CN2

INDICATING

CN8B

CN10

RED

YEL

BLU

RED

YEL

BLU

WHT

BLK

BLU

1231234

1234

RED

BLU

BRN

BLU

GRN+YEL

CN1

TEST

CONTROL P.C.B.

WHT

IVOWHT

REMOTE

CONTROLLER

WHT

BRN

RED

P.C.B.

RECEIVER

7 LINES

IVO

CN11

CN2

IVO

BLK

CN3

BLK

WHT

CN12

RED

BLK

INDOOR UNIT

OUTDOOR UNIT

A : COMPRESSOR

B : FAN MOTOR

C : POWER SWITCH

D : THERMAL FUSE FOR 2P TERMINAL (102°C)

E : THERMAL FUSE FOR P.C.B. (96°C)

F : REVERSING VALVE

G : 50 μF CAPACITOR

H : 2.5 μF CAPACITOR

BLU : BLUE YEL : YELLOW BRN : BROWN WHT : WHITE

GRY : GRAY ORN : ORANGE GRN : GREEN RED : RED

BLK : BLACK PNK : PINK VIO : VIOLET IVO : IVORY

WIRING DIAGRAM

MODEL RAS-18GH5/RAC-18GH5

RAS-63CHA1/RAC-63CHA1

J : TERMINAL BOARD

K : LINE CORD

L : EXTERNAL FAN RELAY

N : NOISE FILTER

P : POWER RELAY

R : SURGE ABSORBER

S : ROOM THERMISTOR

T : HEX THERMISTOR

U : INTERNAL PROTECTOR

V : VARISTOR

X : FUSE

Y : REVERSING VALVE RELAY

Z : AUTO SWEEP MOTOR

Page 36

– 35 –

CIRCUIT DIAGRAM

Remote Control

Page 37

– 37 –

10 16 D(VX) R

RD(VX)1610

C403

C402

±5%

2.0K

R914

1/6W

±5%

0R509

NOTES:

1. THE COMPONENT WITH A "H" MARK ON THE LEFT OF THE TABLE ARE BELONG TO INDICATING BOARD.

2. THE DEFINATION OF MOUNTING FORM a) C --- SURFACE MOUNT (SMT) b) H --- HAND INSERTION c) R --- RADIAL d) A --- AXIAL

3. THE DEFINATION OF TYPE OF CAPACITOR a) F --- FILM b) C --- CERAMIC c) D --- ELECTROLYTIC

AA1A4M

SIN-21T-1.8S

BLUE WIRE

1/6W

±5%

10k 1kR321

1/6W

±5%

SWITCHING POWER SUPPLY

WHITE

B2B-XH-A (TOP ENTRY)

B2P3-VH (TOP ENTRY)

1/6W

±5%2K

R714

AD904 RICP-2.0ATICP2

HGLASS CAPSULE

3.15A FUSE

VARISTOR1

CN10

CN8B

±

20%

250.1

RF500.1C106

1000P RC50

C710

R0.047 C25

0.047 C25

0.1

C50C401

C381

C361

50C321

CC50

C302

C301

0.1

DC450

0.01HAC250

0.01 AC400

AC300

±

20%

1000P

C212 100

C211

AC250C210

0.01

C207 AC250

C206

C205

AC250

TYPE

VOLTAGE

(V)

CAPACITANCE

(F)

SYMBOL

CAPACITOR

MOUNTING FORM

RC25

6.3

C512

C511

C501

RC50

0.1

0.082 AC300

25 C0.1

5068

C101 50

D(PF) C102 C103 C104 C105

C107 C1082550CC C109

150

R R R

MOUNTING FORM

SYMBOL

CAPACITANCE

(F)

VOLTAGE

(V)

TYPE

μ μ μ μ

μ μ

μ

μ μ μ μ

μ μ

μ

220

D(VR)

220

1000P

0.047 1000P

R R

D(PF)

C901

C902

H150

D(PF)

25 C0.1 R

C208 0.047

C209

C621 47

D(MF)

C601

D(VX)

HZ5.1B-J AZD701

THERM-FUSE (P.C.B)

BLACKXH-3P (TOP ENTRY)

CN4

SYMBOL

MODEL NO.

MOUNTING FORM

SIN-21T-1.8S

BROWN WIRE

XH-4P (TOP ENTRY)

WIRES

SIN-21T-1.8S

RED WIRE

BLACK WIRE

WHITE WIRE

1.5A

H ,

450 HL901

SSSS9AE

A1SS-120D401 A1SS-120D701

D303 1SS-120 A

A1SS-120D302

A1SS-120D301

MODEL NO.SYMBOL

MOUNTING FORM

DIODE

A1SS-120D304

DB201 D3SB60 H

TEMPOPARY SWITCH (SW1) INFRARED RECEIVER

EF0EC8004A

450NR-12D

OSC1

SURGE ABSORBER

MODEL NO.

SYMBOL

OTHERS

450NR-12D

FUSE RESISTOR

BUZZER

VARISTOR2

MOUNTING FORM

H H H H H ARF25S

DSA-362MA-05 PKM13EPY

G4A-RY-200

OUTDOOR FAN RELAY

REVERSING VALVE RELAY

STICK RELAY

G4A-RY-200

POWER RELAY

MODEL NO.

SYMBOL

MOUNTING FORM

RELAYS

MOUNTING FORM

XH-3P (TOP ENTRY) WHITE

CN1

MODEL NO.SYMBOL

COLOR

CONNECTORS

REMARKS

THERM-FUSE (2PTERMINAL)

CN3

CN12

VH-4P (TOP ENTRY) WHITE ROOM HEX. THERMISTOR

CN13

BNH-6P (SIDE ENTRY) WHITE STEPPING MOTOR

CN14

WHITE HA TERMINAL

CN15

PH-4P (SIDE ENTRY) EEPROM

CN16

ZR-3P (SIDE ENTRY) TEST PIN

AX-3T2/AX-3T3 H

ULN2003AN

S24C01BDP

TL5001CP MC7805CT

IC1 IC301

IC701

REG1 REG2

MODEL NO.

SYMBOL

MOUNTING FORM

ZENER DIODE

MODEL NO.

SYMBOL

MOUNTING FORM

TRANSISTOR

MODEL NO.

SYMBOL

MOUNTING FORM

ICs

2SC458CT

Q511

AA1A4M

Q301

WHITE

G5N-RELAY G5N-RELAYHH

BLACKVH-2P (3P, TOP ENTRY)

REVERSING VALVE & OUTDOOR FAN RELAY

SU16V-10035 H

NOISE FILTER

D902 A

ZD102

RQ512

2SA673CT

Q901

2SJ326

ZD101 A

SBX8035-F

RICP1

IC PROTECTOR

MOUNTING FORM

SYMBOL

MODEL NO.

ICP-0.6AT

L101 H

INDUCTOR

MOUNTING FORM

SYMBOL

RATED VALUE.

82 1.3A

H ,

L102

H ,

560 0.6A H

ZD511 HZ7B2 A

AD102 D1NL40

H H

LD721 LD723 LD725

YELLOW RED GREEN

SEL6914A SEL6214S SEL6414E

ESD172306

SERVICE SWITCH

RATED VALUE.

SYMBOL

MOUNTING FORM

LED

AHZ30-2

HZ24-3

CN2

ZR-4P (TOP ENTRY)

CN11

ZR-7P (TOP ENTRY) IVORY

IVORY

RECEIVER BOARD

INDICATING BOARD

EARTH (GREEN)

SIN-41T-2.4S

Q302 Q303 R

2SA1757F 2SC1214CTZHR

Q903 Q904

ZD100 HZ24-3 A

1/6W

1/6W 1/6W 1/6W

1/6W

A A

A A A A A

1/6W

±5%

220K

R109

R108

2.2K

±5%

1/6W

1/4W

±5%

330

R107

R106

330

±5%

1/4W

±5%

470

R105

1/4W

±5%

5.6K

R100

±5%

1/6W

±5%

130K

1/6W

±2%

1/6W

±2%

33K

1/6W

±5%

120K

±5% ±5%

±5%

FORM

±5%

FORMFORM

±5%

POWERTOLERANCERESISTANCESYMBOL

RESISTOR

SYMBOL RESISTANCE TOLERANCE POWER SYMBOL RESISTANCE TOLERANCE POWER

R205 R206

±5%

1/6W

±5% ±5%

±1% ±5%

±1% ±5% ±2%

±5% ±5%

R101 R102 R103 R104

±5%

560K

±5%

1/2W

7.5

±5% ±5% ±5% ±5% ±5% ±5%

1/6W 1/6W 1/6W 1/6W 1/6W 1/6W

A A A A A

1/6W

±5%

1/6W

R932

R931

R930

R920

R919

R917

R916

R913

R906

SYMBOL RESISTANCE TOLERANCE POWER

R801

3.3K

±5%

FORM

R721 R723 R725

300

±5%

240

±5%

R911

1/6W

±5%

±5%2.0K

3.3K

±5% ±5%3.3K

20K

±1%

2.21K ±1%

±1%

8.25K ±1%

5.1K

±5%

A A A A

A A A

1/6W

A A

1/6W

±5%

0.2

R610

R601

R603

R606 R607 R608

10K

R609 1K 1/6W

10K

5.1K

10K

R602

R604 R605

10K 1K

±5%

1/6W 1/6W

10K

1/6W

±5%

1/6W

R621

R622

±5%

R712 R713

1K 2K

1/6W 1/6W

R303 R304 R305 R306 R307

390

390 390

5.1k

390

5.1K

R302

R313 10k

10k 10k 10k 10k

R314 R315 R316 R317

10k 10k

R318 R319 R320

R331 R332 10k

R361 R362

12.7k 1k

R381 18k R382 R383 2.4k

R404 R405

10k

R511 R512 R513 R514 R515

2.7k

5.1k

10k

5.1k

R510 1M

RRRR

R R

D2S6M

300

ISS131

YELLOW WIRE

H H

RED WIRE

SIN-21T-1.8S SIN-21T-1.8S

μ

μ μ μ

μ

μ μ

μ

BLUE

YELLOW

RED

ICP2

Q903

R914

D701

C402

C403

R509

BROWN

RED

VARISTOR 2

VARISTOR 1

3.15A FUSE

R317

R713

D304

R321

R320

L901

R712

NO USE

AV CC

AVSS

AN7

AN6

AN5

AN4

AN3

AN2

AN1

AN0

ROOM TH.

HEX. TH.

FAST FEED

TEST INDICATION MODE

NO USE

INDOOR FAN OVER-CURRENT

PWM VOLTAGE FEEDBACK

EEPROM SELECTION

P9 6

P9 7

VCC

P9 1

P9 2

P9 3

P9 4

P9 5

PWM O/P

P9 0

SCL

SDA

EEPROM

NO USE

HEX. TEMP RANGE SELECTION

REVERSING VALVE RELAY

CN13

(BNH-6P) WHITE

Q303

STICK RELAY

REVERSING VALVE

REG1

JW1

THERM-FUSE FOR

THERM-FUSE FOR 2PTERMINAL

C109

R100ZD100

ZD101

C108

7 5

R104

R101

C105

C106R108

R109

R105

R107R106

Q901

R102R103

C102

ICP1

D102

REG2

C104

L102

12V

C107

POWER SUPPLY

C103

ZD102

L101

C512

C710

C902

FAN MOTOR DRIVER

Q904

R917

R916

C901

R919

R920

D902

R911

12V

POWER RELAY

OUTDOOR FAN RELAY

R723

R725

R721

FAN

OUTPUT

NO USE

7P7

5P7

4P7

6P7

3P7

2P7

1P7

P54

P52

P53

P55

P56

P57

P17

P60

P61

P62

P63

P64

P65

P66

P67

P70

FORCED COOL

REMOCON ID

TEST INDICAT.

SELECTION

NICE TEMP.

CANCEL

ABNORMAL FAN CURRENT

STICK RELAY

POWER RELAY

OUTDOOR FAN RELAY

REVERSING VALVE R.

FAN S (LOW)

FAN LO (MED)

FAN HI

HEATER

LOUVER

CCW

LED OUTPUT

REMOCON SELECTION

HA I/P

COOL/DEHUM.

COMP. OPER.

DASH

FILTER/

POWERFUL

TIMER

OPERATION

DEHUMIDIFY

HA O/P

CURRENT TRANS

BUZZER

NO USE

REMOCON I/P

SINGLE/MULTI

1P5

0P5

6P1

0P4

1P4

2P4

3P4

4P4

5P4

6P4

7P4

TM0E

4IRQ

1IRQ

IRQ

RES

TEST

2OSC

1OSC

IC1

AUTO RESTART

OSC1

R605

R603

R602

R601

NORMAL

COOL

R606

SERVICE SW

R607

R608

R604

ID1

REMOCON ID (A/B SELECTION)

STEPPING MOTOR

12V

IC701

12V

RESET

R515

R514

R511R512

C511

Q511

Q512

12V

R513

ZD511

AMAND

R318

R319

R510

R609

R610

C601

RED

BRN

BLK

50V

0.5A

SURGE ABSORBER

E (GREEN&YELLOW)

TERMINAL BOARD

WHITE

POWER RELAY

423

BLUE

RED

POWER-SW

M-BOARD

L (BROWN)

N (BLUE)

3322

OUTDOOR FAN RELAY

SWITCHING POWER BOARD

1/4W 470K

70V 0.15A

2200pF

1KV 800V 1A

220 F 50V

(VH-2P)

CN8B

WHITE

CN10

(XH-2P)

2.2K

50V 220 F

200V

10A

200V

250V

0.0022 F

2W 150

70V 0.15A

70V

0.15A

25V 120 F

1/6W 3.5K

1/6W 1K

0.01 F

25V

0.7A

3W 120

0.047 F

1/4W

HZ5B1

HZ7B1L

2W 150

800V 3A

450V,2.2 F

INDOOR DC FAN MOTOR

RED

YELLOW

BLUE

35V

R932

R931

R930

D904

C101

R906

CN1

(XH-3P)

WHITE

CN4

(XH-3P)

BLACK

C401

R205

R206

C213

GREEN

(D3SB60) DB201

NOISE FILTER2

C207 C206

C205

C212

C501

IVORY

WHITE

R316

R315

R314

R313

R383

CN15

(PH-4P)

CN16

(ZR-3P)

R303

R306

134

56827

R304

R307

IC301/IC302 (E2PROM)

C302

C301

R302

R305

R332

R331

R404

R405

C381

R382

R381

D401

C361

R362

R361

D305

D306

Q301

C321

D301

D302

D303

TEST PIN

GRAY

BLACK

RESISTANCE: 10K ohms ±3% (25 C) B-CONSTANT: 3950K ±2% (B25/50)

(VH-4P) WHITE

CN12

ROOM TEMPERATURE THERMISTOR

HEAT EXCHANGER THERMISTOR

RESISTANCE: 10K ohms ±2% (25 C) B-CONSTANT: 3950K ±2% (B25/50)

RECEIVER

UNIT

C621

R622

TEMPORARY OPERATION

R621

SERVICE SWITCH

TEMPORARY OPERATION

NORMAL

15A 15A 10A

GND

VOUT

SW1

RECEIVER BOARD (R-BOARD)

CN11

(ZR-7P)

CURRENT SELECTOR

R714

ZD701

(ZR-7P)

NORMAL

12V

CN11

(ZR-4P)

INDICATION BOARD (H-BOARD)

TIMER LAMP

OPERATION LAMP

FILTER LAMP

(ZR-4P)

LD725

CN2

LD723

LD721

2 3 4

CN14 (XH-4P) WHITE

BLACK

(VH-2P)

CN3

R801

B.Z

12V

BZ1

R913

Q302

C201 C200

C203 C202

CN2

NOISE FILTER1

PRINTED WIRING BOARD LOCATION DIAGRAM

MODEL RAS-18GH5

Page 38

– 39 –

BLOCK DIAGRAM

MODEL RAS-18GH5/RAC-18GH5

Page 39

Operation mode

Control function

Fan Cooling Sensor dehumidiﬁ cation Heating Automatic

Start/stop button, basic mode

Timer operation

ON timer

OFF timer

OFF

→

timer

Automatic

MED

• Operation in the previous circulation mode

• Operation in “HI” mode

• Operation in “MED” mode

• Operation in “LO” mode

• Same as on the left.

• Only circulation with cut velocity is executed, independent of the thermostat signal.

(1) Strong

Circulation mode

Thermostat operation

→

MED

→

• The power relay is delayed by 2 seconds from the start of thermostat operation.

(1) In case of “Automatic” mode

Note:

• The min. ON time of the power relay is 3 minutes, and the min. OFF time also is 3 minutes.

(2) In other modes than “Automatic” Same as above (but operation is made

with the velocity set at the time of operation start).

• “HI”, “MED”, or “LO” operation is executed according to the thermostat signal. (Refer to “Thermostat operation”.)

→

• “LO” and “Stop” are repeated according to the thermostat signal, independent of the setting.

Notes:

• Forced operation by start/stop button ON is executed even with thermostat OFF.

• The room temperature 30 sec after operation start, minus

0.66 deg, becomes the set temperature.

•

When the room temperature is 16°C or lower, 16°C becomes the set temperature.

•

The other operations are the same as for (1).

Air-blow mode (A) (B)

H L H L L L S S L Automatic L

• “HI”, “MED”, “LO”, and “Stop” are repeated according to the thermostat signal and time.

• “MED”, “LO”, and “Stop” are repeated according to the thermostat signal and time.

• “LO” and “Stop” are repeated according to the thermostat signal and time.

• The “Automatic” speed mode for each operation mode is used independent of the setting. (“Week” at the time of “Sensor dehumidiﬁ cation”.)

• The operation mode at the start of operation differs as shown below according to the room temperature.

• A shift is not accepted at the time of operation start.

• There is no switching between modes after start of operation.

• When the operation is started again within 20 min. after stop with the start/stop button, operation will be executed in the previous mode.

• The operation details are the same as for each operation mode.

• The set temperature is set with the room temperature adjustment button. Correction by V, ±3°C is possible with. At this time, the operation mode judgement temperature also is shifted at the same time. However, correction is possible only in cooling operation mode, but not in “Sensor dehumidiﬁ ca- tion” mode.

(2) Set temperature is higher than room temperature.

(1) When the set temperature is lower than the room

temperature.

Example for “HI” circulation mode

Notes:

• The min. ON time of the power relay is 3 minutes, and the min. OFF time also is 3 minutes.

• In automatic circulation mode, “HI” in section (B) occurs only the ﬁ rst time.

BASIC MODE

MODEL RAS-18GH5/RAC-18GH5

• The min. ON time of the power relay is 3 minutes, and the min. OFF time also is 3 minutes.

• The indoor fan is not delayed with operation start by start/ stop button ON.

• The indoor fan is delayed by 5 sec with operation start by thermostat operation.

Cooling The set temperature shall be 27°C.

Sensor The set temperature dehumidi- shall be 2 degrees ﬁ cation below the room temperature at the start of operation.

Heating The set temperature shall be 23°C + temperature shift amount.

No.

Reversing valve lock protection

AIR BLOW CHANGE TO "H" FORCILY WHEN ENTERING "PD CUT 2" AIR BLOW CAN BE CHANGED BY REMOTE CONTROL AFTER TEMP. T7. AIR BLOW RETURNS TO THE SET SPEED AT T5.

•

All relays are stopped by low-

temperature input.

•

Not accepted during hot keep, during compressor stop, during defrosting and during forced 3 minutes.

•

Accepted only during heating

operation.

•

Recovery at the time of stop by low-temperature input is reset recovery.

•

The timer lamp ﬂ ashes at the

time of stop.

– 41 –

Heating load reduction and Pd cut

Room temperature

at the start of

operation

→

Page 40

– 43 –

Control function

Operation mode

Fan Cooling Sensor dehumidiﬁ cation Heating Automatic

• Sleep operation is executed for each operation mode.

• At the time of heating operation mode, the same operation as for heating is executed.

• Defrosting of each operation mode is executed.

• The operation is switched OFF at the set time.

Preheating operation

Defrosting (including automatic fresh defrosting).

Notes:

• 60 minutes after the sleep key is switched on, sleep operation is started.

• When the sleep key is switched on during OFF timer operation, the OFF timer will be canceled.

• When the sleep key is switched on during OFF timer operation, the OFF timer will be cancelled.

• When the sleep key is switched on during ON after a timer reservation, sleep operation will be started.

Notes:

• Even when the preheating signal is not given as input, heating operation is started when 3 minutes have passed for T.

• Preheating operation is executed at the time of operation start and after completion of defrosting, and at all other times, there is no operation, independent of the preheating signal.

(Reverse cycle defrosting)

10 min.

min.

(Silencing period)

30 sec

(Cycle balancing time)

30 sec

(Defrosting prohibition

time)

50 min.

min.

-1

•

For the time TE after start of heating operation, defrosting will not be executed even when the defrosting signal is given as input.

•

When the reserve cycle defrosting TA has continued for the time shown in the table on the left, the operation advances to TB and TC independent of the defrosting signal.

•

When the power relay becomes ON after expiration of the time TE, defrosting will be started immediately with input of the defrosting signal.

•

Once defrosting has been completed, the defrosting signal is not accepted for the time TE.

•

When a defrosting signal has been given as input at the time of stop by means of the start/stop switch or at the time of OFF timer count-up, defrosting is executed before operation stop.

•

The defrosting signal is not accepted at the time of overload input.

Sensor dehumidiﬁ cation

Cooling strong

No.

• The set temperature after sleep shift in sensor dehumidiﬁ cation operation is limited by 16°C.

Automatic Heating

Fan

Sensor dehumidiﬁ cation Cooling

Heating Cooling

Yes Yes

Yes

Yes (automatic)

NO Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No

Yes Yes

Cooling/Heating

Item Operation switching

Temporary switch Service switch

Nice temperature reservation Automatic fresh defrosting Defrosting Pd cut 1 Pd cut 2 Pd cut 3 Heating load reduction External fan relay Reversing valve relay Reversing valve lock protection Sleep circuit

Heater operation at the time of sensor dehumidiﬁ cation

Automatic blowing direction Filter sign

Wireless mode

Item Cooling, Sensor 16 17.6 ON temperature dehumidiﬁ cation 24 25.6 Thermostat (Thermostat relay) 32 33.6 operation power relay Heating 16 19.6 (°C) 24 27.6 32 35.6 Differential (°C) 0.33 – – Low-temperature (T1) ON (°C) 1.0 defrosting Reset (°C) 12.0 Preheating Reset (°C) 17.0 ON (°C) 15.0 – – Pd cut 1 (T3) ON (°C) 56.0 (T4) Reset (°C) 52.0 Pd cut 2 (T6) ON (°C) 66.0 (T7) Reset (°C) 57.0 (T5) Fan Relay H [ Original (°C) 58.0 Pd cut 3 (T8) ON (°C) 62.0 (T9) Reset (°C) 57.0

Table 1 Speciﬁ cations

Table 2 Sensor operation values

Other detailed speciﬁ cations

1. When the room temperature rises within 3 minutes after thermostat OFF during cooling operation with automatic velocity, the blowing velocity changes in the order of S → L → H in the same way as at the time of thermostat ON.

2. In case of Tele. control input during stopped ON timer, operation will be started at that time and the timer will be cleared.

3. In case of Tele. control input during operation of the OFF timer, the operation will be stopped at that time and the timer will be cleared.

4. Even when operation stop is executed at the time of outside fan OFF by overload, automatic fresh defrosting will not be executed.

5. In case of switching to “Heating” during “Automatic” heating operation, the operation will be continued as it is when the thermostat is ON. 3 min delay will not be entered. However, the set room temperature and the blowing velocity will be according to the remote control signal. The same applies for switching from “Heating” to “Automatic” heating.

6. In case of switching from “Sensor dehumidification” operation to “Cooling”, as it is when the thermostat is ON. 3 min delay will not be entered. However, the set room temperature and the blowing velocity will be according to the remote control signal.

The same applies for switching from “Cooling” to “Sensor dehumidiﬁ cation”.

The same also applies for “Automatic” sensor dehumidification, cooling “Sensor dehumidiﬁ cation”, “Cooling”.

7. The ﬁ lter sign lights after operation of the indoor fan for 100 hours. The time is cleared when power switch set to OFF and ON again.

8. After entry into trouble mode (when the indication lamp is ﬂ ashing), the rapid feed mode can not be changed.

9. When operation by nice temperature reservation is executed during sleep operation, normal operation will be continued, and the advance time becomes the temperature difference between the set temperature without sleep shift and the room temperature.

10. The 50 minutes of defrosting prohibition are counted from Thermostat ON after start/stop switch ON. When the thermostat is OFF at the time of start/stop switch ON, the 60 minutes will be counted from the time of thermostat ON. The initial OFF time is not counted. Counting starts when the thermostat becomes ON, and the count then continues even if the thermostat becomes OFF.

11. In case of switching from “Heating” the reversing valve is held for 3 minutes.

12. The defrosting signal is not accepted with overload input, and the operation becomes as shown below when the overload input disappears.

(1) When previously the defrosting

signal existed without overload input, defrosting will start immediately.

(2) In cases other than the above,

defrosting will be executed with a defrosting signal in the condition without overload input.

-1

Page 41

● The air deﬂ ector control operation shown below is done when the swing switch

is pressed or when the operation mode is changed.

● The air deﬂ ector control operation shown below is done when the operation

switch is turned off.

Item

3-way AUTO (Swing)

Speciﬁ cation

Cooling/ dehumidifying

Heating

(When the operation switch is turned off Automatic shut operation)

Air blowing direction control

The same as cooling ● dehumidifying

Other detailed speciﬁ cations

1. When the room temperature starts to increase within 3 minutes after thermo OFF in “cooling” and fan speed “AUTO”, the fan speed changes L

→

M → H as

when thermo ON.

2. If “cooling” is selected during “sensor dehumidiﬁ cation” operation the operation continues as it is with the thermo ON. The 3 minutes delay is not started. The set temperature and fan speed depend on the remote control signal.

It is same for “cooling” – – – – “sensor

dehumidiﬁ cation”. It is same for “AUTO” sensor dehumidiﬁ cation cooling “sensor dehumidiﬁ cation” “cooling”.

3. The filter sign lights after 200 hours operation of the room fan. The lamp goes out when the POWER SWITCH set to OFF and ON again.

4. After the failure mode is started (indicator lamp ﬂ ickering), rapid mode changing cannot be done.

5. If the operation is made by the nice temperature reservation during the sleep operation, the normal operation continuously occurs, and for the advance time, the temperature difference between the set temperature without sleep shift and “room temperature” is used.

– 45 –

● Operation starts in advance so that the room temperature reaches

the preset value at the set time.

● The operation time is obtained as follows depending on the room temperature when operation starts.

(1) Calculation method of the moved-up time. Moved-up time (MT) = Moved-up time depending on the temperature

difference (OT) + compensation time (HT).

MT is at least 1 minute if OT is not zero.

Heating Cooling

(MT) 00 ~ 60 min. 00 ~ 60 min.

(OT) 00 ~ 60 min. 00 ~ 60 min.

(HT) –60 ~ 60 min. –60 ~ 60 min.

Obtain OT (moved-up time depending on the temperature difference) from the table below.

“NICE TEMPERATURE” reservation

Heating Cooling

Setting temp. – Room temp. Time (min.) Setting temp. – Room temp. Time (min.)

00 – 01.00 00 00.00 – 02.00 00

01.25 – 03.00 10 02.25 – 05.00 15

03.25 – 07.00 20 05.25 – 08.00 30

07.25 – 10.00 30 08.25 – 11.00 45

10.25 – 13.00 40 11.25 – 60

13.25 – 16.00 50

16.25 – 19.00 60

19.25 – 22.00 60

22.25 –

❈ The preset temperature value shown above does not include any shift value.

(2) Compensation

1 The “Attained” state is monitored and a “Not attained” check is

done to revise the compensation time (HT).

“Attained” monitor

Continuously monitored during “NICE TEMPERATURE” operation.

(Heating)

When the room temperature < Set value + compensation shift,

it is regarded to be “attained” and 5 minutes are reduced from the compensation time.

(Cooling)

When the room temperature < Set value + compensation shift,

it’s operated same as above.

“Not attained” check

Performed once when the “NICE TEMPERATURE” timer is completed.

(Heating)

When the room temperature < Set value + compensation shift

1°C, it is regarded to be “Not attained” and 5 minutes are added to the compensation time.

(Cooling)

When the room temperature > Set value + compensation shift

+1°C, it’s operated same as above.

❈ If the room temperature is within +1°C from the set value +

compensation shift, compensation is not done.

Item

ON temperature Thermostat operation (Thermostat relay) power relay (°C)

Differential (°C)

Low-temperature defrosting

Cooling, sensor dehumidiﬁ cation

(T1)

RAS-18GH5 16 17.6 24 25.6

33.6

0.33 ON (°C) 4.0 Reset (°C) 12.0

Table 2 Sensor operation values

Item RAS-18GH Automatic Yes Heating Yes Operation switching Sensor dehumidiﬁ cation Yes Cooling Yes Fan Yes Temporary switch Yes (automatic) Service switch Cooling Yes Nice temperature reservation Yes Defrosting Yes Sleep circuit Yes Heater operation at the time of sensor dehumidiﬁ cation No Automatic blowing direction Yes Filter sign Yes Wireless mode Heat and Cool wireless

Table 1 Speciﬁ cations

Down

❈ Swing start direction

Page 42

– 47 –

REFRIGERATING CYCLE DIAGRAM

MODEL RAS-18GH5/RAC-18GH5

Page 43

– 48 –

DESCRIPTION OF MAIN CIRCUIT OPERATION

1. ON / OFF

The “ON / OFF” and “Timer reserve button” and “Sleeping” function independently.

Their operations are shown in Fig. 1-1.

Fig. 1-1 Timer operation

Page 44

– 49 –

2. Reset Circuit

● The reset circuit is used to reset the program to its initial settings when the power is turned on or when the

power is recovered after a power failure.

● The micro computer is reset when the reset input is “Hi”, and operation is possible when the reset input is

“Lo”.

● The waveforms at each point when the power is turned on and off are shown in the diagrams.

● When the power is turned on, the voltages of the DC 12V line and DC 5V lines are increased. When the

voltage of DC 12V lines reaches about 7V, ZD511 is turned ON, the potential of Q511’s base rises and Q511 is turned ON. Since Q511’s collector is set to “LO” at this time, Q512 is turned OFF and the reset input of the micro computer is set to “Lo”. The DC 5V line voltage has already become 5V at this time and the micro computer starts operation.

● When the power is turned OFF, the voltage of the DC 12V line decreases. When it becomes about 7V,

ZD511 is turned OFF, then Q511 is turned OFF, Q512 is turned ON the reset input of the micro computer is set to “Hi’ and the micro computer is set to the reset mode.

Page 45

– 50 –

3. Buzzer Circuit

When the buzzer is to be activated, buzzer output pin 30 of the micro computer alternates between ON and

OFF repeatedly at 4kHz and Q302 is turned ON/OFF accordingly. A 4kHz voltage is applied to the buzzer and the diaphragm of the buzzer vibrates to output 4kHz sound.

4. Initial setting (IC301)

The pre-heating operation start value, ratings of the compressor, maximum rotation speed, etc. are preset

in the micro computer.

5. Receive circuit

Infrared signals from the wireless remote controller are received by the light receiving unit and output after

being ampliﬁ ed and shaped.

Page 46

– 51 –

6. Service Operation Circuit

● Use the service switch to select “Cooling” temporarily when the interior electric equipment has troubled.

● Setting the switch to “Cooling” causes continuous cooling room temperature control. To control the room temperature, turn on and off the disconnect switch. To protect the compressor, wait at least 3 minutes before turning on again.

● The fan speed is “MED”.

● Does not operate is 12V is not generated in the control circuit.

● When the service switch is used for operation, each change switch is overridden.

● Setting the service switch to “Cooling” turns on the “Power relay”.

Page 47

– 52 –

INPUT SIGNAL OPERATING SPECIFICATION REFERENCE

OPERATION OPERATION MODE AIR DEFLECTOR

PRESENT CONDITION

KEY INPUT

INTERNAL FAN

(THERMO. ON)

INTERNAL FAN

OFF

(THERMO. OFF)

MAIN SWITCH ONMAIN SWITCH

OFF

CHANGE OF

OPERATION

STOP

DURING

OPERATION

DURING

OPERATION

STOP

DURING

OPERATION

DURING

OPERATION

EACH MODE

AUTO COOL

COOL

FAN

AUTO DRY

DRY

CIRCULATOR

AUTO DRY

DRY

CIRCULATOR

COOL

FAN

DRY

CIRCULATOR

EACH MODE

STOP SWINGING AND MODE BECOMES INITIALIZING

CONDITION.

INITIALIZING CONDITION OF EACH MODE.

ONE SWING (CLOSING AIR DEFLECTOR)

1 DOWNWARD

2 UPWARD

INITIALIZE

1 DOWNWARD

INITIALIZE

1 DOWNWARD

2 UPWARD

STOP AT THE MOMENT.

START SWINGING

1 DOWNWARD

2 UPWARD

3 DOWNWARD

STOP AT THE MOMENT.

START SWINGING

1 DOWNWARD

2 UPWARD

3 DOWNWARD

STOP AT THE MOMENT.

ONE SWING (CLOSING AIR DEFLECTOR)

1 DOWNWARD

2 UPWARD

INITIALIZE AT NEXT

OPERATION.

INITIALIZE AT NEXT

OPERATION.

STOP

DURING ONE SWING

STOP

DURING SWINGING

STOP

DURING SWINGING

TEMPORARY STOP

DURING SWINGING

STOP

DURING ONE SWING

STOP

DURING ONE SWING

STOP

DURING SWINGING

DURING

INITIALIZING

STOP

DURING SWINGING

AUTO SWING FUNCTION

STOP SWINGING TEMPORARILY.

(SWING MODE IS CLEARED IF SWING COMMAND IS

TRANSMITTED DURING TEMPORARY STOP.)

START SWING AGAIN.

Page 48

– 53 –

SERVICE CALL Q & A

While cooling, the compressor sometimes stops abruptly.

Check whether frost sticks on the heat exchanger of indoor unit or not. Wait for 3 – 4 minutes until the frost melts.

If cooling is performance when the room temperature is low, frost may stick on the heat exchanger of indoor unit.

Cooling operation

The fan speed does not change during a dehumidifying operation.

Dehumidifying operation

The fan speed is always LO at a dehumidifying operation.

Cold air comes out during a dehumidifying operation.

To improve the dehumidification efficiency, LO fan speed operation is performed. Therefore the air is cold. This is not a trouble.

The operation does not stop even by raising the room temperature setting of remote control at a dehumidifying operation.

At a dehumidifying operation, the actual room temperature is compared with the room temperature setting when starting the operation and the operation is as follows.

1) When actual room temperature > room temperature setting.

The operation is according

to the room temperature setting on the remote controller.

2) * When actual room temperature < room temperature setting

Regardless of the room

temperature setting, the temperature is automatically set slightly lower than the room temperature.

In this case, the status is as

2) and, therefore, the operation

by the room temperature control is impossible. Turn off the On / OFF switch, set the room temperature to a new value and turn on the operation by the On / Off switch.

In the dehumidifying mode, the temperature set by remote controller is set slightly higher than the room temperature but the operation starts.

This is the status in 2) of (A4). The temperature is set a little lower than the room temperature to carry out a dehumidifying operation as far as possible.

Page 49

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Air does not come out when starting a heating operation.

It is not a trouble. The fan is stopped to avoid cold wind.

When starting the operation, the heat exchanger is cold and, therefore, the fan is stopped.

Wait 2–3 minutes.

Heating operation

Air does not come out sometimes while in a heating operation.

Defrosting is on. Wait for 5–10 minutes unit the outdoor unit is defrosted.

The fan speed is set to “HI” or “MED” but the heating operation starts with a LO fan speed.

The heating operation starts with a LO fan speed for 30 seconds. If the fan speed is set to HI, the operation starts with LO fan speed, followed by MED fan speed for 30 seconds and then by HI fan speed.

The operation stops during a heating operation while the room temperature is set at “30”.

If a heating operation is performed when the exterior temperature is high, the operation may stop to protect the equipment.

The outdoor fan does not move at a heating operation by the service switch.

It is not a trouble. When heating, the outdoor fan is stopped to avoid excessive pressure rise.

A10

Q10

Heating has been turned off by the main operation but the “Hot keep lamp” lights and the outdoor unit operations.

Q11

Auto fresh defrosting

“Auto fresh defrosting” operates. When stopping the operation, whether the outdoor unit is frosted or not is checked and, if in the afﬁ rmative, defrosting is performed before stopping the operation.

A11

Page 50

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How is the automatic operation mode determined?

Q12

According to the room temperature, cooling or dehumidifying operation is automatically selected.

Cooling: When room temperature is

approx. 27°C or higher

Dehumidifying: When room temperature

is between approx. 23°C and 27°C

Heating: When room temperature

is approx. 23°C or lower

A12

Automatic operation

At an automatic operation, changing the fan speed change switch does not vary the fan speed.

Q13

The fan speed is automatically determined.

A13

The room temperature cannot be controlled at an automatic operation.

Q14

It is automatically set as follows.

At cooling: Set at 27°C

At dehumidifying: Set slightly

lower than room temperature

The room temperature setting can be raised 3°C by “

” or

lowered 3°C by “ V ”.

A14

When changing the room temperature setting in an automatic operation, the next automatic operation mode is determined by new room temperature setting. If, for example, the room temperature setting is 2°C lowered for example, the operation mode is as follows.

Cooling : When room

temperature is approx. 25°C or higher

Dehumidifying : When room

temperature is between approx. 21°C and 25°C

Heating : When room

temperature is approx. 21°C or lower

Page 51

– 56 –

There is a difference between the room temperature setting and actual room temperature.

Q15

There may be a difference between the room temperature setting and actual room temperature on account of the room structure, air ﬂ ow, etc. If there is a difference from the room temperature, adjust the set temperature to keep living space at a comfortable temperature.

A15

Common, etc.

What will happen if the time setting is changed while in a timer operation?

Q16

A timer operation is performed until the time after changing the time setting.

A16

In the “Automatic fan speed” mode, the indoor fan changes to MED and LO fan speed.

Q17

It is not a trouble. The cold wind preventive function operates.

A17

Set the temporary switch normal.

In case of “ON” timer, the operation does not start at a preprogrammed time but a little earlier.

Q18

Nice temperature reservation

The “Nice temperature reservation” functions. The operation starts earlier so the room temperature will be as set at a programmed time. The operation starts at most 60 minutes before a preprogrammed time.

A18

The time to start an operation is irregular while preprogramming at the same time.

Q19

The “Nice temperature reservation” operates. The starting time depends on the room load.

A19

Page 52

– 57 –

Q20

Wireless remote controller

The room temperature sensing thermistor in the indoor unit detects the room temperature and, according to the particular temperature, automatically performs “Cooling” or “Dehumidifying” operation. The value indicated not at an “Automatic” but manual operation is not the actual room temperature but the room temperature setting.

When the room temperature setting is “16”, pressing the room temperature control button “ V ” causes no transmission. At “32”, pressing “ ” causes no transmission either.

Q21

The room temperature is settable within the range of 16 - 32 and not beyond.

A21

The timer cannot be set.

Q22

Is the current time set? The timer cannot be set unless the clock is adjusted correctly.

A22

The current time disappears soon.

Q23

The current time disappears soon and the timer settting indication takes a precedence.

A23

When setting the current time, its indication blinks for approximately 3 minutes.

1) When the operation mode is “Automatic”, the fan speed is automatically ﬁ xed to “Automatic”.

2) At an “Automatic” operation, the room temperature setting is not displayed.

The room temperature

is automatically set as follows.

At cooling

Set at 27°C.

At dehumidifying

Set to a temperature

slightly lower than the room temperature.

At heating

Set at 23°C.

3) At an “Automatic” operation, the room temperature setting is not displayed.

However, every pressing “ ” or “ V ” button changes

1°C within the range of:

27±3°C when cooling, 23±3°C when heating.

A20

1) When the “Automatic” operation mode is selected, “Automatic” does not change by pressing the fan speed select button.

2) The room temperature setting is not displayed.

3) Pressing the room temperature control button develops transmit mark “ ” and sounds a receive sound but does not display the room temperature setting.

Page 53

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In spite of timer “Preprogram”, the time setting is extinguished.

Q24

Isn’t the time over the preprogrammed time? As soon as the preprogrammed time is reached, the time setting disappears.

A24

After selecting a “Dehumidifying” operation mode, the fan speed mode remains “LO” fan speed”.

Q25

At a “Dehumidifying” operation, the “LO” fan speed” is forcibly selected.

A25

Page 54

– 59 –

TROUBLE-SHOOTING

No operation at all. *1

*1 Before using the service switch, disengage

and engage the plug. Do not operate the remote controller.

Check the following parts and replace if faulty

Remove and check the continuity across.1) Current fuse

2) Varistor

Check whether the appearance is blackish or not.

The resistance must be inﬁ nite. *2

No cooling or heating

Power relay abnormal

YES

Check the continuity between contacts.

3) Power switch

4) Thermal fuse for therminal board

(96°C) Continuity across

→

If there is no continuity,

also check the fan motor and capacitor.

(102°C) Continuity across

→

If there is no continuity,

check the electric parts and replace if abnormal.

5) Thermal fuse for Terminal board

*2 Before checking the varistor, detach a terminal.

Operates by setting the service switch to forced cooling?

Return the service switch to "Normal".

Set the remote controller to an operation status and press the ON/ OFF button.

Is the level LO (approx. 0.5V) between driver IC701 pin

power

relay and 0V?

YES Compressor does not turn at LO.

Replace Power relay

Is voltage normal between Blue and Red of the CN6? *3

YES

Indoor fan motor or

Q904 abnormal

YES

Is the level LO (approx. 0.5V) between driver IC 701 pin

(Reversing valve relay) and 0V at heating operation?

Reversing valve

relay abnormal

Replace Reversing

valve relay

Page 55

– 60 –

Check the circuit board of

control board

YES

Check the circuit board inside parts. When checking, carry out a self diagnosis by indoor indicator lamp.

Fan Speed

MED

Replace faulty part

*4 Wait for 3 minutes before forced re-

operation by the service switch.

CN6 BLUE-RED (V)

RAS-18GH5

Cooling Heating

30.0

26.0

22.0

30.0

24.0

21.5

Is voltage normal (approx. 280 ~ 300V) at out put side of the DB201?

Page 56

– 61 –

CAUTION

Remote control is disabled while the Timer lamp is ﬂ ashing. To check operation, turn off the power switch and turn it on again.

Timer-Lamp, break-down checking in blinking sign.

Check the break-down factor from the frequency of timer-lamp blinking.

No. Mode of Timer-Lamp blinking Indication Factor Estimated Break-Down Part

4-way valve not working

Inside temperature is low in heating operation time or inside temperature is high in cooling operation time.

(1) 4-way valve is not working.

(2) Heat-exchanger thermistor is

in disconnection.

(Only heating time)

Force cooling operation

Unit is under forcible operation or under balancing after forcible operation.

Check force cooling switch at indoor electrical.

IC 401 Data read wrongly

In case that data read from IC401 is wrong.

IC401 data is not in order.

Heat exchanger thermistor

error

Heat exchanger thermistor open or short-circuit detected.

(1) Thermistor

(2) Indoor - control circuit board.

Room thermistor error

Room thermistor error open or short-circuit detected.

(1) Thermistor

(2) Indoor - control circuit board.

( – – 0.5 second on, 0.5 second off.)

– – –– 15 times

– – – 14 times

– – – 13 times

––––––– 2 times

–––––––– 1 time

DC Fan motor - over ﬂ ow of electricity

Indoor - DC Fan motor has over ﬂ ow of electricity.

(1) Indoor - Fan is locked.

(2) Indoor - Fan motor damage.

(3) Indoor - control circuit board.

– – – 10 times

Page 57

– 62 –

PARTS LIST AND DIAGRAM

INDOOR UNIT MODEL : RAS-18GH5

Page 58

– 63 –

MODEL RAS-18GH5

1 PMRAS-18GH4 002 1 CABINET

2 PMRAS-40CNH2 023 1 MOUNTING PLATE

3 PMRAS-51CHA1 002 1 FAN MOTOR

4 PMRAS-51CHA1 003 1 TANGENTIAL FAN

5 PMRAS-25CNH2 005 1 P-BEARING ASSY

6 PMRAS-51CHA1 004 1 FAN MOTOR BASE

7 PMRAS-18GH4 003 1 CYCLE ASSY

8 PMRAS-51CHA1 020 1 FAN COVER

9 PMRAS-18CP5 003 1 PIPE SUPPORT

10 PMRAS-63CA2 003 1 DRAIN PAN ASSY

11 PMRAS-18C9 002 1 AUTO SWEEP MOTOR

12 PMRAS-63CA2 005 1 P.W.B (LED)

13 PMRAS-60YH5 001 1 FRONT COVER ASSY

14 PMRAS-60YH5 002 1 FRONT PANEL

15 PMRAS-10C7M 008 3 CAP

16 PMRAS-51CHA1 010 2 FILTER

17 PMRAS-51CHA1 011 1 REMOTE CONTROL ASSY

18 PMRAS-10C3M 003 1 REMOTE CONTROL SUPPORT

19 PMRAS-51CHA1 015 1 THERMISTOR SUPPORT

20 PMRAS-18C9G 007 1 THERMISTOR

21 PMRAS-18CP2R 002 1 POWER SWITCH

22 PMRAS-18GH4 001 1 P.W.B (MAIN)

23 PMRAS-51CHA1 013 1 P.W.B (POWER SW SUPPLY)

24 PMRAS-51CHA1 017 1 TERMINAL BOARD (FUSE)

25 PMRAS-51CHA1 018 1 THERM-FUSE FOR P.C.B

26 PMRAS-51CHA1 019 1 P.W.B (RECEIVER)

27 PMRAC-07CV1 006 1 TERMINAL BOARD (2P)

PART N0.

RAS-18GH5

NO.

Q’TY / UNIT

PARTS NAME

Page 59

– 64 –

PARTS LIST AND DIAGRAM

OUTDOOR UNIT MODEL : RAC-18GH5

Page 60

– 65 –

MODEL RAC-18GH5

1 PMRAC-50NH4 912 1 SV. COVER

2 PMRAC-18GH4 901 1 COMPRESSOR

3 PMRAC-18GH4 902 3 COMPRESSOR RUBBER

4 PMRAC-50NHA 903 1 VALVE (2S)

5 PMRAC-18GH4 905 1 VALVE (4S)

6 PMRAC-51CHA1 902 1 CONDENSER

7 PMRAC-40CNH2 918 1 FAN MOTOR SUPPORT

8 PMRAC-18CH1 901 1 FAN MOTOR

9 PMRAC-40CNH2 917 1 PROPELLER FAN

10 PMRAC-51CHA1 903 1 TERMINAL BOARD (4P)

11 PMRAC-63CHA2 907 1 COMPRESSOR CAPACITOR

12 PMRAC-63CHA2 908 1 FAN MOTOR CAPACITOR 2.5μF

13 PMRAC-40CNH2 926 1 SIDE PLATE (L)

14 PMRAC-18CH1 903 1 CABINET

15 PMRAC-51CHA1 907 1 GRILL ASSY

16 PMRAC-40CNH2 923 1 SIDE PLATE (R)

17 PMRAC-24CP5 904 1 NET

18 PMRAC-40CNH2 922 1 TOP COVER

20 PMRAC-18GH4 906 1 REVERSING VALVE COIL

21 PMRAC-18GH5 901 1 REVERSING VALVE

22 PMRAC-51CHA1 905 1 STRAINER (CAPI)

23 PMRAC-18GH4 908 1 STRAINER (COND)

24 PMRAC-09GH4 904 1 CHECK VALVE

PART N0.

RAC-18GH5

NO.

Q’TY / UNIT

PARTS NAME

Page 61

PM NO. 0479E

Printed in Malaysia

RAS-18GH5 / RAC-18GH5