Hitachi 0162E Service Manual

SERVICE MANUAL

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY

RAS-18CH1
RAS-24CH2

RAC-18CH1
RAC-24CH2

PM

NO. 0162E

RAS-18CH1/RAC-18CH1
RAS-24CH2/RAC-24CH2

REFER TO THE FOUNDATION MANUAL

CONTENTS

SPECIFICATIONS ---------------------------------------------------- 5
HOW TO USE --------------------------------------------------------10
CONSTRUCTION AND DIMENSIONAL DIAGRAM -----31
MAIN PARTS COMPONENT ------------------------------------33
WIRING DIAGRAM --------------------------------------------------35
CIRCUIT DIAGRAM-------------------------------------------------37
PRINTED WIRING BOARD LOCATION DIAGRAM-----39
BLOCK DIAGRAM ---------------------------------------------------41
BASIC MODE ---------------------------------------------------------43
REFRIGERATING CYCLE DIAGRAM ------------------------49
DESCRIPTION OF MAIN CIRCUIT OPERATION -------51
AUTO SWING FUNCTION---------------------------------------55
SERVICE CALL Q & A -------------------------------------------- 56
TROUBLE SHOOTING --------------------------------------------62
PARTS LIST AND DIAGRAM -----------------------------------65

SPECIFICATIONS

TYPE

MODEL
POWER SOURCE

TOTAL INPUT

COOLING

HEATING

DIMENSIONS
(mm)

NET WEIGHT

TOTAL AMPERES

CAPACITY

TOTAL INPUT
TOTAL AMPERES

CAPACITY

(W)

(A)

(kW)

(B.T.U./h)

(W)

(A)

(kW)

(B.T.U./h)

W

H
D

(kg)

INDOOR UNIT OUTDOOR UNITINDOOR UNITOUTDOOR UNIT

RAS-18CH1 RAC-18CH1

1 Ø, 50 Hz, 220 - 230V

1680 - 1730

7.8 - 7.7

5.10

17,410

1680 - 1730

7.8 - 7.7

5.7

19,450

1030

295
183

12

(WALL TYPE)

RAS-24CH2 RAC-24CH2

850
650
298

60

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

1 Ø, 50 Hz, 220 - 230V

2180 - 2200

10.4 - 10.1

6.0

20,490

2350 - 2380

11.1 - 10.8

7.0

23,890

1030

295
183

12

After installation

850
650
298

60

ROOM AIR CONDITIONER

DECEMBER 2002

Refrigeration & Air-Conditioning Division

INDOOR UNIT + OUTDOOR UNIT

SAFETY DURING REPAIR WORK

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

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

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

First, I must disconnect
the power cord plug

from the power outlet.

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

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

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

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

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

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

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

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

or more as measured by a 500V

DANGER

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

– 1 –

WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS

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

2. Object parts
(1) Micro computer

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

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

the same way).

A conductive polyvinyl bag

IC

Fig. 1. Conductive Container

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

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

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

taken.
(4) Be sure to place a part on a metal plate with grounding.
(5) Be careful not to fail to turn off power when you repair the printed circuit board. At the same time,

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

IC

Conductive sponge

Body earth
(Elimik conductive band)

1M

Fig. 2. Body Earth

Clip for connection with a
grounding wire

– 2 –

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

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

Working
table

Bare copper wire (for body earth)

Staple

Fig. 3. Grounding of the working table

Soldering iron

2

Resistor of 1 M

Earth wire

Grounding
wire

(1/2W)

Screw stop at the screwed
part using a rag plate

Fig. 4. Grounding a soldering iron

Use a high insulation mode (100V, 10M

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

measuring instrument shortcircuit a load circuit or the like.

or higher) when ordinary iron is to be used.

– 3 –

CAUTION

!

1. In quiet or stopping operation, slight flowing noise of refrigerant in the refrigerating cycle is heard occasionally,
but this noise is not abnormal for the operation.

2. When it thunders near by, it is recommended to stop the operation and to disconnect the power cord plug
from the power outlet for safety.

3. The room air conditioner does not start automatically after recovery of the electric power failure for
preventing fuse blowing. Re-press START/STOP button after 3 minutes from when unit stopped.

4. If the room air conditioner is stopped by adjusting thermostat, or missoperation, and re-start in a moment,
there is occasion that the cooling and heating operation does not start for 3 minutes, it is not abnormal
and this is the result of the operation of IC delay circuit. This IC delay circuit ensures that there is no
danger of blowing fuse or damaging parts even if operation is restarted accidentally.

5. This room air conditioner should not be used at the cooling operation when the outside temperature is
below 10°C (50°F).

6. This room air conditioner (the reverse cycle) should not be used when the outside temperature is below
–10°C (14°F).
If the reverse cycle is used under this condition, the outside heat exchanger is frosted and efficiency falls.

7. When the outside heat exchanger is frosted, the frost is melted by operating the hot gas system, it is not
trouble that at this time fan stops and the vapour may rise from the outside heat exchanger.

– 4 –

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

RAS-18CH1

40 W

NO

NO

–

NO

NO

NO

3.15A

G4A

YES

RAC-18CH1

40 W

2.5 F,450V

YES (INTERNAL)

SHX33SC4-U

50 F, 440VAC

YES (INTERNAL)

YES (INTERNAL)

NO

NO

NO

TEMPORARY SWITCH

SERVICE SWITCH

TRANSFORMER

VARISTOR

NOISE SUPPRESSOR

THERMOSTAT

REMOTE CONTROL SWITCH (LIQUID CRYSTAL)

FUSE CAPACITY

UNIT

REFRIGERANT CHARGING
VOLUME
(Refrigerant R22)

PIPES (MAX. 15m)

PIPES (MIN. 5m)

NO

YES

NO

450NR

NO

YES(IC)

YES

20 A TIME DELAY FUSE

---------- ❈ 1400g

ADDITIONAL REFRIGERANT R22
AT 25g PER EVERY METER IF
PIPE LENGTH MORE THAN 8m

NO

YES

NO

NO

NO

YES(IC)

NO

– 5 –

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

RAS-24CH2

40 W

NO

NO

–

NO

NO

NO

3.15A

G4A

YES

RAC-24CH2

40 W

2.5 F,450V

YES (INTERNAL)

LH938SA1

75 F, 400VAC

YES (INTERNAL)

YES (INTERNAL)

NO

NO

NO

TEMPORARY SWITCH

SERVICE SWITCH

TRANSFORMER

VARISTOR

NOISE SUPPRESSOR

THERMOSTAT

REMOTE CONTROL SWITCH (LIQUID CRYSTAL)

FUSE CAPACITY

REFRIGERANT CHARGING
VOLUME
(Refrigerant R22)

PIPES (MAX. 15m)

PIPES (MIN. 5m)

NO

YES

NO

450NR

NO

YES(IC)

YES

30 A TIME DELAY FUSE

---------- ❈ 1720gUNIT

ADDITIONAL REFRIGERANT R22
AT 30g PER EVERY METER IF
PIPE LENGTH MORE THAN 8m

NO

NO

NO

NO

NO

YES(IC)

NO

– 6 –

Figure showing the installation of Indoor anf Outdoor unit

!

CAUTION

The installation height of indoor unit must be 2.5m or more in a non public area

above 50mm

above 100mm

above 100mm

above

0.45m

2,500mm or more

above 300mm

must not bend

above 100mm

above 700mm

above 200mm

above 50mm when
installed on the

(

ceiling of balcony

Maximum pipe length 15m

Minimum pipe length 5m

)

Plug

above 100mm

give clearance as
wide as possible

above 200mm

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

The difference in height
between the indoor and
outdoor unit should be
kept max 5m.
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).

The connection of insulated
drain hose.

inner diameter ø 16mm

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

– 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.

!

!

Make sure to connect earth line.

Indicates the instructions that must be followed.

●

Please keep this manual after reading.

PRECAUTIONS DURING INSTALLATION

●

Do not reconstruct the unit.
Water leakage, fault, short circuit or fire may occur if you reconstruct
the unit by yourself.

●

!

WARNING

!

CAUTION

Please ask your sales agent or qualified technician for the installation
of your unit. Water leakage, short circuit or fire may occur if you install
the unit by yourself.

●

Please use earth line.
Do not place the earth line near water or gas pipes, lightning-conductor,
or the earth line of telephone. Improper installation of earth line may
cause electric shock.

●

A circuit breaker should be installed depending on the mounting site of
the unit. Without a circuit breaker, the danger of electric shock exists.

●

Do not install near location where there is flammable gas. The outdoor
unit may catch fire if flammable gas leaks around it.

●

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

The sign in the figure indicates prohibition.

W

A
R
N

N
G

W

A
R
N

N
G

PRECAUTIONS DURING SHIFTING OR MAINTENANCE

●

Should abnormal situation arises (like burning smell), please stop operating the unit

!

I

and turn off the circuit breaker. Contact your agent. Fault, short circuit or fire may
occur if you continue to operate the unit under abnormal situation.

●

Please contact your agent for maintenance. Improper self maintenance may cause
electric shock and fire.

●

Please contact your agent if you need to remove and reinstall the unit. Electric
shock or fire may occur if you remove and reinstall the unit yourself improperly.

PRECAUTIONS DURING OPERATION

●

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

!

●

Do not put objects like thin rods into the panel of blower and suction side
because the high-speed fan inside may cause danger.

●

I

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

●

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

– 8 –

PRECAUTIONS DURING OPERATION

●

The product shall be operated under the manufacturer specification and not
for any other intended use.

●

Do not attempt to operate the unit with wet hands, this could cause fatal
accident.

●

When operating the unit with burning equipments, regularly ventilate the
room to avoid oxygen insufficiency.

●

Do not direct the cool air coming out from the air-conditioner panel to face
household heating apparatus as this may affect the working of apparatus
such as the electric kettle, oven etc.

●

Please ensure that outdoor mounting frame is always stable, firm and without
defect. If not, the outdoor unit may collapse and cause danger.

●

Do not splash or direct water to the body of the unit when cleaning it as this
may cause short circuit.

●

Do not use any aerosol or hair sprays near the indoor unit. This chemical can

!

C
A

adhere on heat exchanger fin and blocked the evaporation water flow to drain
pan. The water will drop on tangential fan and cause water splashing out from
indoor unit.

U
T

I

●

Please switch off the unit and turn off the circuit breaker during cleaning, the
high-speed fan inside the unit may cause danger.

O
N

●

Turn off the circuit breaker if the unit is not to be operated for a long period.

●

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

●

Do not put water container (like vase) on the indoor unit to avoid water dripping
into the unit. Dripping water will damage the insulator inside the unit and
causes short-circuit.

●

Do not place plants directly under the air flow as it is bad for the plants.

●

When operating the unit with the door and windows opened, (the room humidity is always above
80%) and with the air deflector facing down or moving automatically for a long period of time,
water will condense on the air deflector and drips down occasionally. This will wet your furniture.
Therefore, do not operate under such condition for a long time.

●

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

– 9 –

NAMES AND FUNCTIONS OF EACH PART

INDOOR UNIT

Air filter

To prevent dust from coming into the indoor unit.
(Refer page 27)

Front panel

Indoor unit indicators

Light indicator showing the operating condition.
(Refer page 11)

Horizontal deflector
(Air Outlet)

(Refer page 22)

●●

●

●●

Vertical deflector

OUTDOOR UNIT

MODEL NAME AND DIMENSIONS

Remote controller

Send out operation signal to the indoor unit. So as
to operate the whole unit.
(Refer page 12)

Drain pipe

Condensed water drain to outside.

Connecting cord and insulation pipe for piping

Air inlet (Back and Left side)

Air outlet

!

CAUTION

• When heating operation, drain or
defrosted water flows out from outdoor
unit. Don’t close drain outlet portion

in chilly area so as not to freeze these.

MODEL

RAS-18CH1 / RAS-24CH2

RAC-18CH1 / RAC-24CH2

WIDTH (mm)

1030

850

– 10 –

HEIGHT (mm)

295
650

DEPTH (mm)

183
298

INDOOR UNIT INDICA T ORS

OPERATION LAMP

This lamp lights during operation.
The OPERATION LAMP flashes in the following cases
during heating.

(1) During preheating

For about 2–3 minutes after starting up.

(2) During defrosting

Defrosting will be performed about once an hour
when frost forms on the heat exchanger of the
outdoor unit, for 5–10 minutes each time.

FILTER LAMP

When the device is operated for a total of about 100
hours, the FILTER lamp lights to indicate that it is time
to clean the filter. The lamp goes out when the POWER
SWITCH set to OFF and ON again.

TIMER LAMP

This lamp lights when the timer is working.

OPERA TION INDICA T OR

● This figure shows the opening condition of

front panel. Refer to page 26 in relation to
how to open or close the front panel.

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.

– 11 –

NAMES AND FUNCTIONS OF REMOTE CONTROL UNIT

REMOTE CONTROLLER

This controls the operation of the indoor unit. The range of control is about 7 meters. If indoor lighting
is controlled electronically, the range of control may be shorter.
This unit can be fixed on a wall using the fixture provided. Before fixing it, make sure the indoor unit can
be controlled from the remote controller.

● 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 deflector.

● TIMER control

Use this button to set the timer.

● OFF-TIMER button Select the turn OFF time.

● ON-TIMER button Select the turn ON time.

● RESERVE button Time setting reservation.

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

● CANCEL button Cancel time reservation.

Precautions for Use

● Do not put the remote controller in the following places.

● Under direct sunlight.

● In the vicinity of a heater.

● Handle the remote controller carefully. Do not drop it on the floor,

and protect it from water.

● Once the outdoor unit stops, it will not restart for about 3 minutes

(unless you turn the power switch off and on or unplug the power
cord and plug it in again).

This is to protect the device and does not indicate a failure.

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

device may stop for about 3 minutes for protection.

– 12 –

AUTOMATIC OPERA TION

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.

Press the FUNCTION selector so that the display indicates the (AUTO)
mode of operation.

1

START

STOP

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

● 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.

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

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

C

● The preset temperature and the actual room temperature may vary

somewhat depending on conditions.

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

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

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

■ Condition of Automatic Operation

Initial room temperature
(approx.)

Over 27°C COOL

23~27°C

Under 23°C HEAT

➡
➡

➡

DEHUMIDIFY

Temperature settingFunction

27°C

Slightly lower than the
room temperature

23°C

– 13 –

FAN SPEED

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

LOW

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

HEA TING 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.

Press the FUNCTION selector so that the display indicates

C

˚

1

2

(HEAT).

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

(AUTO) : The fan speed is HI at first and varies to MED

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).

3

C

˚

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

START

STOP

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

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

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

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.

– 14 –

DEHUMIDIFYING OPERA TION

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.

C

˚

START

STOP

1

2

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

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

Press the FUNCTION selector so that the display indicates
(DEHUMIDIFY).
The FAN SPEED is set at LOW automatically.
The FAN SPEED button does not work.

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

The range of 20-26
room temperature for dehumidifying.

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

°C is recommended as the

■ 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.

– 15 –

COOLING OPERA TION

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

Press the FUNCTION selector so that the display indicates

C

˚

1

(COOL).

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

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

MED automatically when the preset temperature

2

(HI) : Economical as the room will become cool

(MED) : Quiet.
(LOW) : More quiet.

Press the (START/STOP) button. Cooling operation starts

START

STOP

C

˚

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.

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

3

has been reached.

quickly.

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.

(FAN SPEED) button

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

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

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

– 16 –

F AN OPERATION

You can use the device simply as an air circulator. Use this function to dry the interior of the indoor
unit at the end of summer.

Press the FUNCTION selector so that the display indicates

1

(FAN).

FAN SPEED (AUTO)

operation:

For the heating operation

2

START

STOP

.....

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

● The fan speed will automatically change according to the temperature

of discharged air.

● When the difference of room temperature and setting temperature is

large, fan starts to run at HI speed.

● When the room temperature reaches setting temperature, fan speed

changes to LOW automatically.

Press the (FAN SPEED) button.*

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

* Note • In the fan operation mode, only display of FAN SPEED

setting will change by pressing FAN SPEED button; the
actual fan speed cannot be changed directly from HI to
LOW mode.

For the cooling operation

● When the difference of room temperature and setting temperature is

large, fan starts to run at HI speed.

● After room temperature reaches the preset temperature, the cooling

operation, which changes the fan speed and room temperature to obtain
optimum conditions for natural healthful cooling will be performed.

– 17 –

HOW TO SET THE TIMER

Time, Day, Month

TIME, DAY,
MONTH

After you change the
batteries;

(current time,
day, month)

OFF TIMER

ON TIMER

OFF-Timer

RESERVE
CANCEL

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

ON-Timer

● The device will turn on at

the designated times.

Start

M D

STOP

Stop

Start

1

Set the current month and

day with the TIMER control
button.

M D

1

Press the (OFF-TIMER)

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

AM

1

Press the (ON-TIMER)

button the (ON) mark blinks
on the display.

AM

3

ON/OFF-Timer

Start Stop

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

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

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

1

Press the (ON-OFF)

button so that the (OFF)
mark blinks.

PM

2

Set the turn-off time

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

PM

Press the (ON-

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

PM

AM

How to Cancel Reservation

Point the signal window of the remote controller toward the indoor unit, and press the (CANCEL)
button.
The (RESERVED) sign goes out with a beep and the (TIMER) lamp turns off on the indoor unit.

NOTE

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

– 18 –

2

Press the

(TIME) button.

AM
PM PM

2

Set the turn-off time with

the TIMER control button.

3

TIMER control button.

PM

Set the current time with the

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

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 flashing and the sign (RESERVED)
lights. A beep occurs and the (TIMER) lamp lights on the indoor unit.

4

Press the (TIME) button again.

The time indication starts lighting
instead of flashing.

● The time indication will disappear

PM

● To check the current time setting,

automatically in 10 second.

press the (TIME) button twice.
The setting of the current time is

now complete.

2

Set the turn-on time with

the TIMER control button.

AM

4

Set the turn-on time with

the TIMER control button.

PM

AM

PM

The setting of turn-off time is now complete.

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 flashing and the (RESERVED) sign
lights. A beep occurs and the (TIMER) lamp lights on the indoor unit.

Example:

AM

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 flashing and the (RESERVED) sign
lights. A beep occurs and the (TIMER) lamp lights on the indoor unit.

PM

AM

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.

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.

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

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

current time at first because it serves as a reference.

● As the time settings are stored in memory in the remote controller, you only have to press the

(RESERVE) button in order to use the same settings next time.

– 19 –

HOW TO SET THE SLEEP TIMER

Set the current time first 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

▲

H

Sleep timer

1 hour 2 hours 3 hours 7 hours

▲

Indication

▲

Sleep timer off

▲

▲

Sleep Timer: The device will continue working for the designated
number of hours and then turn off.

SLEEP

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

H

Sleep

timer

1

Set the ON-timer.

Start

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

time is 2:38 a.m.

2

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

AM

H

AM

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.

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.

– 20 –

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.

Operation with the sleep timer

Function Operation

Heating

“ ”

Cooling

“ ”

and

dehumidifying

“ ”

Fan

“ ”

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.

The room temperature will be

Sleep timer set

30 minutes later

2 C

2 hours
later

1 hour later

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.

Sleep
timer set

30 minutes later

2 hours
later

6 hours
later

3 hours later

The settings of room temperature and circulation are varied.

5 C

7 hours
later

3 hours later

7 hours later

NOTE

● 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.

– 21 –

ADJUSTING THE AIR DEFLECTOR

1

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

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

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

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

● Use the horizontal air deflector within the adjusting range

shown on the right.

● When the operation is stopped, the horizontal air

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

CAUTION

!

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

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

Adjustment of the conditioned air to the left and right.

2

Hold the vertical air deflector as shown in the figure and adjust
the conditioned air to the left and right.

When cooling
dehumidifying

When heating

– 22 –

HOW TO EXCHANGE THE BATTERIES IN THE REMOTE CONTROLLER

Push and pull to the
direction of arrow

Remove the cover as shown in the figure and take out the

1

old batteries.

▼

Install the new batteries.

2

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

!

CAUTION

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.

– 23 –

THE IDEAL W AYS OF OPERATION

Suitable Room Temperature Install curtain or blinds

!

Warning

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

Ventilation Effective Usage Of Timer

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

!

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.

Do Not Forget To Clean The Air Filter

Dusty air filter will reduce the air volume and
the cooling efficiency. To prevent from wasting
electric energy, please clean the filter every 2
weeks.

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.

Please Adjust Suitable T emperature For

Baby And Children

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

– 24 –

FOR USER’S INFORMATION

The Air Conditioner And The Heat Source In The Room

!

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.

Not Operating For A Long Time

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.

OFF

When Lightning Occurs

!

Warning

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

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.

To prevent
interference,
place at least
1m away.

Inverter-type
fluorescent
lamp.

TV

– 25 –

ATT ACHING THE AIR CLEANSING AND DEODORIZING FILTERS

!

CAUTION

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

1

2

3

Open the front panel.

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

with both hands.

Remove the filter.

● Push upward to release the claws and pull out the

filter.

Attaching the air cleansing and deodorizing fil­ters to the filter.

● Attach the air cleansing and deodorizing filters to

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

Claws

(4 places)

!

CAUTION

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

4

Attach the filters.

● Attach the filters by ensuring that the surface writ-

ten “FRONT” is facing front.

● After attaching the filters, push the front panel at

three arrow portion as shown in figure and close it.

NOTE

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

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

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

● Air cleansing and deodorizing filters 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 <SPX­CFH5>. Please use this number for ordering when you want to renew it.

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

occur.

– 26 –

MAINTENANCE

PROCEDURE

!

CAUTION

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

1. AIR FILTER

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

1

2

3

Open the front panel and remove the filter

● Gently lift and remove the air cleansing and

deodorizing filter from the air filter frame.

Vacuum dust from the air filter and air cleans­ing and deodorizing filter using vacuum cleaner.
If there is too much dust, rinse under running
tap water and gently brush it with soft bristle
brush. Allow filters to dry in shade.

● Re-insert the air cleansing and deodorizing

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

● After attaching the filters, push the front panel

at three arrow portions as shown in figure
and close it.

NOTE:

● Air cleansing and deodorizing filter 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.

!

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

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

to the sun. The filter may shrink.

● Do not use detergent on the air cleansing and deodorizing filter as some detergent may deteriorate

the filter electrostatic performance.

CAUTION

– 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.

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

● Move the projections of the left and right

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

Attaching the Front Panel

panel slightly, put it out forward.

!

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.

Projection

Hole

Flange

– 28 –

!

CAUTION

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

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 fine 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.

1

2

3

Confirm

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 firmly plugged into the socket?
(Please ensure no loose contact between them).

– 29 –

AFTER SALE SERVICE AND WARRANTY

WHEN ASKING FOR SERVICE, CHECK THE FOLLOWING POINTS.

CONDITION CHECK THE FOLLOWING POINTS

● Is the fuse all right?

When it does not operate

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

● Is the voltage extremely high or low?

● Is the circuit breaker “ON”?

● Was the air filter cleaned?

● Does sunlight fall directly on the outdoor unit?

● Is the air flow 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?

Notes

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

may occassionally occur, but they are not abnormal for the operation.
(1) Slight flowing 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 filter 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
specified capacity.

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

– 30 –

CONSTRUCTION AND DIMENSIONAL DIAGRAM

MODEL RAS-18CH1/RAS-24CH2

1019

About

380

350

About

View from back

(Pipe lead-out)

6.5 60

201
183

47

Horizontal deflectorDischarge grille

47

31 120.5

60 60

263 317450

158

Drain hose

1030

Drain

47

Top air suction grille

Vertical deflector

P

7070

Front cover

295

147

56 17.5

28

47

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

6.5 60

Drain outlet

Hole on the wall
for ø 65mm pipe

Power cord
Connecting cable

Drain cap
connection port

Narrow pipe

Wide pipe

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 5m.

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.

Line
cord

L
N

Indoor Unit

DCBA

Connecting
Cord

ø1.6 or ø2.0

Outdoor Unit

RED

D

BRN

C

WHT

B

BLK

A

– 31 –

ø2.0

MODEL RAC-18CH1 / RAC-24CH2

26 850 79

10464

340

2022 298

Handle

Fixing hole

Air suction
grille

Holes for anchor bolt
(2-ø12)

507 198

Notch for anchor bolt
(2-ø12 Notchs)

12
37

57

Air outlet

10

1010

320

340

More than

100

638

650

Service space

700

More than

100

More than

201

Handle

96

More than

100

169.5

Note:

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

– 32 –

MAIN PARTS COMPONENT

THERMOSTAT (Room Temperature Thermistor)

Thermostat Specifications

MODEL RAS-18CH1 / RAS-24CH2
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)

TEMPERATURE °C

INDICATION

16

INDICATION

24

INDICATION

32

FAN MOTOR

Fan Motor Specifications

MODEL RAS-18CH1, RAS-24CH2

PHASE
RA TED VOL T AGE
RA TED FREQUENCY
OUTPUT

– – – – –

DC35V

– – – – –

40 W

RAC-18CH1, RAC-24CH2

SINGLE

220-240V

50 Hz

40 W

POLE NUMBER

CONNECTION

RESISTANCE VALUE

( )

20°C

75°C

35V

– – – – –

YELLOW

5V

– – – – –

– – – – –

RED

BLUE

M

INTERNAL
THERMAL FUSE

BLACK

CAPACITOR

RM = 122.4

RA = 114.8

RM = 161.6

RA = 139.6

6

RED

RM

RA

GRAY

– 33 –

COMPRESSOR MOTOR

Compressor Motor Specifications

MODEL RAC-18CH1 RAC-24CH2
COMPRESSOR MODEL SHX33SC4-U LH938SA1

PHASE SINGLE
RATED VOLTAGE 220 ~ 240 V
RATED FREQUENCY 50 Hz
LOCKED ROTOR CURRENT 45 A 45 A
POLE NUMBER 2

WHITE

CONNECTION

RESISTANCE VALUE

(68°F)

( )

(167°F)

EXTERNAL OVERLOAD RELAY
INTERNAL PROTECTOR

S (RED)

20°C

75°C

R (ORANGE)

ORANGE

RM = 1.47
RA = 2.88

RM = 1.79
RA = 3.50

NO

YES

CAPACITOR

S (RED)

RM

PROTECTOR

RA

RED

RM = 1.520

RA = 1.632

RM = 1.848

RA = 1.985

NO

YES

M OR R
(ORANGE)

C (WHITE)

CAUTION

!

RAC-18CH1

C (WHITE)

RAC-24CH2

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

– 34 –

U

A

B

H

G

J

F

J

L

Y

T

S

Z

2

1

N

N

P

2

1

RV

3.15A

X

B

E

D

V

M

CK

R OR V

ORG

S OR X

C OR U

RED

RED

GRY

GRY

BLK

BLK

BLU

WHT

BLU

B

C

D

A

BLU

BLU

BLU

CN4

WHT

B

C

D

A

BRN

BRN

RED

RED

CONNECTING

CORD

WHT

BRN

RED

BLK

GRN+YEL

CN13

CN15

CN16

CN14

SWITCHING POWER P.C.B.

GRN

43

43

C1C2M1M2

GRY

GRY

4 LINES

CN2

INDICATING

CN8B

CN10

RED

YEL

BLU

RED

YEL

BLU

WHT

BLK

BLU

BLU

M

M

1231234

1234

RED

BLU

BRN

BLU

GRN+YEL

CN1

TEST

HA

CONTROL P.C.B.

1

2

3

4

WHT

WHT

IVOWHT

REMOTE

CONTROLLER

WHT

BRN

RED

P.C.B.

P.C.B.

RECEIVER

7 LINES

IVO

CN11

CN11

CN2

IVO

BLK

CN3

BLK

BLK

WHT

CN12

RED

BLK

INDOOR UNIT

OUTDOOR UNIT

WIRING DIAGRAM

RAS-63CHA1/RAC-63CHA1

A : COMPRESSOR J : TERMINAL BOARD S : ROOM THERMISTOR

MODEL RAS-18CH1/RAC-18CH1

B : FAN MOTOR K :LINE CORD T : HEX THERMISTOR

C : POWER SWITCH L : EXTERNAL FAN RELAY U : INTERNAL PROTECTOR

D : THERMAL FUSE FOR 2P TERMINAL (102°C) M :STICK RELAY V : VARISTOR

E : THERMAL FUSE FOR P.C.B. (96°C) N :NOISE FILTER X : FUSE

G : 50 µF CAPACITOR R : SURGE ABSORBER Z : AUTO SWEEP MOTOR

F : REVERSING VALVE P :POWER RELAY Y : REVERSING VALVE RELAY

H : 2.5 µF CAPACITOR

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

GRY : GRAY OR N : ORANGE GR N : GREEN RED : RED

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

– 35 –

U

A

B

H

G

J

F

J

L

Y

T

S

Z

2

1

N

N

P

2

1

RV

3.15A

X

B

E

D

V

M

CK

R OR V

ORG

S OR X

C OR U

RED

RED

GRY

GRY

BLK

BLK

BLU

WHT

BLU

B

C

D

A

BLU

BLU

BLU

CN4

WHT

B

C

D

A

BRN

BRN

RED

RED

CONNECTING

CORD

WHT

BRN

RED

BLK

GRN+YEL

CN13

CN15

CN16

CN14

SWITCHING POWER P.C.B.

GRN

43

43

C1C2M1M2

GRY

GRY

4 LINES

CN2

INDICATING

CN8B

CN10

RED

YEL

BLU

RED

YEL

BLU

WHT

BLK

BLU

BLU

M

M

1231234

1234

RED

BLU

BRN

BLU

GRN+YEL

CN1

TEST

HA

CONTROL P.C.B.

1

2

3

4

WHT

WHT

IVOWHT

REMOTE

CONTROLLER

WHT

BRN

RED

P.C.B.

P.C.B.

RECEIVER

7 LINES

IVO

CN11

CN11

CN2

IVO

BLK

CN3

BLK

BLK

WHT

CN12

RED

BLK

INDOOR UNIT

OUTDOOR UNIT

WIRING DIAGRAM

MODEL RAS-24CH2/RAC-24CH2

RAS-63CHA1/RAC-63CHA1

A : COMPRESSOR J : TERMINAL BOARD S : ROOM THERMISTOR

B : FAN MOTOR K :LINE CORD T : HEX THERMISTOR

C : POWER SWITCH L : EXTERNAL FAN RELAY U : INTERNAL PROTECTOR

D : THERMAL FUSE FOR 2P TERMINAL (102°C) M :STICK RELAY V : VARISTOR

G : 75 µF CAPACITOR R : SURGE ABSORBER Z : AUTO SWEEP MOTOR

F : REVERSING VALVE P :POWER RELAY Y : REVERSING VALVE RELAY

E : THERMAL FUSE FOR P.C.B. (96°C) N :NOISE FILTER X : FUSE

H : 2.5 µF CAPACITOR

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

GRY : GRAY OR N : ORANGE GR N : GREEN RED : RED

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

– 36 –

CIRCUIT DIAGRAM

Remote Control

Key matrix table

1

SEG5

2

SEG0

3

SEG1

4

SEG2

5

SEG3
SEG4

6
7

SEG5

8

SEG6

9

SEG7

10

COM3

11

COM2

12

COM1

13

COM0

14

SEG14

15

SEG13

16

SEG12

17

SEG11

18

SEG13

19

SEG9

20

SEG8

D3

RB425D(1/2)

C8
50v/1u

LCD 1

K 1

K2K3

K4

K5

P10

P11

K6

K7 K8

K8 K10

K11K12

SEG20
SEG19
SEG18
SEG17
SEG16
SEG21
SEG24
SEG25
SEG26
SEG27
SEG28

P12

40
39
38
37
36
35
34
33
32
31
30
29

NC

28

NC

27

NC

26

NC

25

NC

24

NC

23

NC

22

NC
NC

21

K13 K14

K15 K16

K17

K18

D0

D1

D2

D3

65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80

64

SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32

SEG33
SEG34
SEG35

1

62

63

SEG19

SEG18

P41

P40

3

2

R1

100k

60

61

SEG17

SEG16

P42

P43

5

4

59

58

57

56

54

SEG14

SEG15

IC 1

SEG13

SEG12

55

SEG11

SEG10

SEG9

53

52

51

SEG8

SEG7

50

49

SEG5

SEG6

M3455OM6A-504FP

D2

P00

6

P01

7

P02

8

P03

9

P10

10

P11

11

P12

12

P13

13

D0

14

D1

15

16

48 47

SEG4

D3

D4

17 18

46

SEG2

SEG3

D5

19

45

44

SEG0

SEG1

D7

D6

20

21

SW1

SW-187-2P

Input

P10

P11

P12

43

42

SEG42

SEG43

D9

D8

22

23

Output

Door open

Door shut

Door open

Door shut –

Door open

Door shut

41

SEG41

SEG40

40

P30
P31

39

VL C2
VL C3
XC IN

XC OUT

VDD

VSS

X OUT

X IN

RESET

CARR

P23
P22

P21

P20

BEEP

24

38
37
36
35
34
33
32
31
30
29
28
27
26
25

R2

100k

NCVL C1

D0 D1

Start/Stop

Operation selection

Start/Stop Super silent cooling

On timer

Hour up

Room temperature up

Off timer –

Sleep –

D1 D2

EL-1L7

R6

R7

R3

100k

24(1/8W)

R5

330

P

R4

100k

Q1

2SC3443

or 2SC2982

D2D1

R8

R6 R9

R9

R10
12M

D2

Fan speed selection

–

Hour down

Room temperature down

Reservation

–

D3

RB425D

(1/2)

X1

K19

910kHz

C9

105

Automatic swing

•

Day

Super cooling

R11

150k

X2

32.768

kHz

C6

104

D3

–

present time

Cancel

–

R14
220k

R13

220K

104

C7

R15

100k

R16
100k

C1

334

C2

220p

C3

220p

C4
18p

C5
22p

– 37 –

R12

220k

10 16 D(VX) R

RD(VX)1610

C403

C402

H

2

±5%

2.0K

R914

A

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

AA1A4M

H

SIN-21T-1.8S

BLUE WIRE

A

1/6W

±5%

10k
1kR321

A

1/6W

±5%

1k

SWITCHING POWER SUPPLY

SWITCHING POWER SUPPLY

WHITE

H

H

WHITE

B2B-XH-A (TOP ENTRY)

B2P3-VH (TOP ENTRY)

A

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

R

R0.047 C25

0.047 C25

0.1

0.1

0.1

R

R

R

R

C50C401

C381

C361

50C321

C

C

50

50

C302

C301

C

0.1

DC450

C

0.01HAC250

0.01 AC400

AC300

±

20%

1000P

1000P

C212 100

DH

C211

AC250C210

H

0.01

C

CH

H

H

C207 AC250

C206

C205

AC250

C

F

33

TYPE

VOLTAGE

(V)

CAPACITANCE

(F)

SYMBOL

CAPACITOR

MOUNTING
FORM

RC25

6.3

C512

C511

C501

RC50

0.1

0.1

0.082 AC300

25 C0.1

5068

C101 50

D(PF)
C102
C103
C104
C105

10

C107
C108

2550C

C

C109

150

H

R

R

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
µ

µ

µ

220

50

D(VR)

220

1000P

0.047
1000P

R

R
R

D(PF)

D(PF)

C

C901

50

C902

H150

D(PF)

25 C0.1 R

C208 0.047

FH

HC

C209

C621 47

16

D(MF)

H

C601

CR

R

D(VX)

HZ5.1B-J AZD701

THERM-FUSE (P.C.B)

H

WHITEXH-3P (TOP ENTRY)

CN4

SYMBOL

MODEL NO.

MOUNTING
FORM

SIN-21T-1.8S

BROWN WIRE

XH-4P (TOP ENTRY)

WIRES

SIN-21T-1.8S

SIN-21T-1.8S

SIN-21T-1.8S

H

H

H

RED WIRE

BLACK WIRE
WHITE WIRE

H

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

H

H

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

H

REVERSING VALVE
RELAY

STICK RELAY

G4A-RY-200

H

POWER RELAY

MODEL NO.

SYMBOL

MOUNTING
FORM

RELAYS

H

H

H

H

H

H

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

H

H

H

H

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

R

R

2SC458CT

Q511

AA1A4M

Q301

WHITE

G5N-RELAY
G5N-RELAYHH

BLACKVH-2P (3P, TOP ENTRY)

H

REVERSING VALVE &
OUTDOOR FAN RELAY

SU16V-10035 H

NOISE
FILTER

D902 A

A

ZD102

RQ512

2SA673CT

Q901

2SJ326

H

R

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

R

ESD172306

SERVICE
SWITCH

R

RATED VALUE.

SYMBOL

MOUNTING
FORM

LED

AHZ30-2

HZ24-3

CN2

ZR-4P (TOP ENTRY)

CN11

ZR-7P (TOP ENTRY) IVORY

IVORY

IVORY

H

H

RECEIVER BOARD

INDICATING BOARD

H

EARTH (GREEN)

SIN-41T-2.4S

H

Q302
Q303 R

2SA1757F
2SC1214CTZ

H
R

Q903
Q904

R

ZD100 HZ24-3 A

A

1/6W

1/6W

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

A

A

A

A

A

A

1/6W

A

A

1/6W

A

A
A

A
A

A
A

A

A

A
A

A
A
A
A
A

A

H

A

A

A

A

A

A

A

A

A

A

1/6W

1/6W

1/6W

1/6W

1/6W

1/6W

1/6W

1/6W

1/6W

1/6W

1/6W

1/6W

1/6W

1/6W

1/6W

1/6W

±5%

220K

R109

R108

2.2K

±5%

1/6W

1/4W

±5%

330

R107

R106

330

±5%

1/4W

1/4W

±5%

470

R105

1/4W

±5%

5.6K

R100

±5%

1/6W

±5%

130K

1/6W

±2%

3K

1/6W

±2%

33K

1/6W

±5%

120K

±5%
±5%

±5%

±5%

±5%

±5%

±5%

±5%

FORM

±5%

FORMFORM

±5%

±5%

±5%

±5%

±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

7W

±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

A

A
A
A
A
A

1/6W

1/6W

1/6W

1/6W

1/6W

±5%

±5%

±5%

±5%

±5%

±5%

1/6W

A

R932

R931

R930

R920

R919

R917

R916

R913

R906

SYMBOL RESISTANCE TOLERANCE POWER

R801

3.3K

±5%

FORM

R721
R723
R725

300

±5%

±5%

240

240

±5%

R911

1/6W

±5%

±5%2.0K

2

3.3K

±5%
±5%3.3K

20K

±1%

2.21K ± 1%

±1%

1K

8.25K ± 1%

5.1K

±5%

A
A
A
A

A
A
A

1/6W

1/6W

1/6W

1/6W

1/6W

1/6W

1/6W

A

1/6W

A

A

1/6W

A
A

1/6W

1/6W

H

A

1W

±5%

0.2

R610

R601

R603

R606
R607
R608

10K

10K

1K

R609 1K 1/6W

10K

5.1K

10K

R602

R604
R605

10K
1K

±5%

±5%

±5%

1/6W
1/6W

A

A

10K

1/6W

A

±5%

1/6W

A

1K

R621

47

R622

A

±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

1k

R404
R405

10k

1k

1k

R511
R512
R513
R514
R515

2.7k

5.1k

10k

5.1k

3k

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

µ

µ

µ

µ

µ

µ

PRINTED WIRING BOARD LOCATION DIAGRAM

MODEL RAS-18CH1/RAS-24CH2

DD

GND

(XH-3P)

WHITE

(XH-3P)

WHITE

THERM-FUSE FOR

CN1

2PTERMINAL

CN4

THERM-FUSE FOR

HEAT EXCHANGER
THERMISTOR

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

ROOM TEMPERATURE
THERMISTOR

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

INDICATION BOARD
(H-BOARD)

FILTER LAMP

OPERATION LAMP

TIMER LAMP

RECEIVER BOARD
(R-BOARD)

R621

R622

VOUT

C621

+

-

NORMAL

TEMPORARY
OPERATION

15A
15A
10A

NORMAL

V

RECEIVER

UNIT

CN10

(XH-2P)

WHITE

SWITCHING POWER BOARD

1

2W

2.2K

3

CN15

(PH-4P)

WHITE

CN12

(VH-4P)

WHITE

BLACK
BLACK

CN16

(ZR-3P)

IVORY

TEST PIN

LD723
LD721
LD725

CN2

(ZR-4P)

1
2
3

4

(ZR-7P)

CURRENT
SELECTOR

TEMPORARY
OPERATION

SW1

SERVICE SWITCH

CN11

5
6
2
3
4
7
11

200V

10A

50V
220 F

3
1
3
1

4
3
2
1

GRAY

4

GRAY

3
2
1

1

2

3

CN2

(ZR-4P)

1
2
3

4

CN11

(ZR-7P)

5
6
3
2
4
7

200V

1A

250V

0.0022 F

JW1

0V

5V

0V

R713

ZD701

0V

0.047 F

HZ5B1

1/4W

0.01 F

1/6W 3.5K

1/6W 1K

220 F
50V

800V
1A

70V 0.15A

70V

0.15A

2W 150

2W
150

+

-

25V

120 F

2200pF
1KV

70V 0.15A

50V

0.5A

HZ7B1L

R307
R304

IC301/IC302

(E2PROM)

134

5V

D401

0V

R405

R404

12V

R714

L (BROWN)
N (BLUE)
E (GREEN&YELLOW)

1/4W 470K
1/4W 470K

3W 120

25V

0.7A

R303

R306

56827

+

800V

-

3A

5V

C302

C301

0V

R383

R362

R382

R361

R381

0V

M-BOARD

POWER-SW

2

1
3

RED

4

BLUE

1

450V,2.2 F

3

5V

CN8B

(VH-2P)
WHITE

BLK

GREEN

BRN

RED

NOISE FILTER1

D301

D304

0V

D302

D303

Q301

0V

C381

C361

0V

D306

0V

5V

D305

12V

5V

+

0V

+

-

C511

RESET

R721
R725
R723

R514

R513

Q511

Q512

R511R512

ZD511

0V

12V

BZ1

B.Z

R801

Q302

0V

R206

D904

0V

C321

+

C403

C402

0V

R515

0V

C212

L101

R930

R932

5V

C213

R906

R931

OSC1

R712

VARISTOR 1

SURGE
ABSORBER

(D3SB60)
DB201

35V

+

C101

5V

R302
R305
R313
R314
R315

R316

R331

R332

C401

R317

R509

C512

C710
R318

R319

R320
R321

C501

ICP1

2

10
11
12
13
14
15
16
17
18
19
20
21
22

23
24

R510

25
26
27
28
29
30
31
32

3.15A
FUSE

NOISE FILTER2

VCC

1

P9 0
P9 1

3

P9 2

4

P9 3

5

P9 4

6

P9 5

7

P9 6

8

P9 7

9

AV CC

AN0
AN1
AN2
AN3
AN4
AN5
AN6
AN7

AVSS

TEST

V

RES

IRQ

TM0E

VARISTOR 2

C203 C202

R100ZD100

+

-

C109

ICP2

PWM O/P

SDA

SCL
NO USE
NO USE
NO USE

HEX. TEMP
RANGE SELECTION

NO USE

EEPROM
SELECTION

ROOM TH.

HEX. TH.

FAST FEED
TEST INDICATION

MODE

NO USE

PWM VOLTAGE
FEEDBACK

INDOOR FAN
OVER-CURRENT

2X
1X
SS

1OSC
2OSC

REMOCON I/P

0

NO USE

1IRQ

SINGLE/MULTI

4IRQ

BUZZER
CURRENT TRANS

6P1

HA O/P

7P4

C207 C206

C201 C200

C108
R101

R104

R911

R916

IC1

EEPROM

R205

C205

POWER SUPPLY

2

REG1

6
7

5

R917

LOUVER

CCW

FAN

REVERSING VALVE R.

OUTDOOR FAN RELAY

AMAND

REMOCON SELECTION

ZD101

R107 R106

1
4

3

8

Q903

Q904

FAN LO (MED)

OUTPUT

FAN S (LOW)

POWER RELAY
STICK RELAY

ABNORMAL
FAN CURRENT

AUTO RESTART

REMOCON ID

TEST INDICAT.
FORCED COOL

COOL/DEHUM.

LED OUTPUT

FAN MOTOR
DRIVER

R914

R913

NO USE
NO USE
NO USE
NO USE

HEATER

FAN HI

NICE TEMP.

CANCEL

SELECTION

HA I/P

COMP. OPER.

DASH

FILTER/

POWERFUL
TIMER

OPERATION

DEHUMIDIFY

7P7
6P7
5P7
4P7

B

3P7

A

2P7

B

1P7

A

P70
P67
P66
P65
P64
P63
P62
P61
P60

P17

X2

P57

X1

P56
P55
P54
P53
P52

1P5
0P5
0P4
1P4
2P4
3P4
4P4
5P4
6P4

R109

64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33

R105

C106R108

C105

POWER RELAY

43

STICK RELAY

L102

Q901

D102

5V

R601
R602

R603

R607

C601

R610

43

+

R102R103

C102

L901

D902

REMOCON ID

ID1

(A/B SELECTION)

R604

R605
R606

R608

R609

0V

ZD102

+

IC701

7
6
5

4
3
2
1

I

REG2

C104

C901

12V

9

8

0V

REVERSING VALVE RELAY

2

OUTDOOR FAN RELAY

O

+

-

C107

G

R919

R920

10
11
12

REVERSING VALVE

13

OUTDOOR FAN RELAY

14

POWER RELAY

15

STICK RELAY

16

SERVICE SW

0V

C103

5V

C902

D701

Q303

0V

COOL

NORMAL

3
32

12V

5V

0V

RED

YELLOW

BLUE

12V

12V

5V

0V

WHITE
BLACK

RED

1

BROWN

3

CN3

(VH-2P)

BLACK

CN13

(BNH-6P)
WHITE

5
4
3
2
1

CN14

(XH-4P)

WHITE

C1

1

C2

2

M1

3

M2

4

RED

YELLOW

BLUE

M

STEPPING
MOTOR

HA

TERMINAL
BOARD

B
A

D
C

INDOOR DC
FAN MOTOR

M

– 39 –

COMPRESSOR

OUTDOOR

FAN MOTOR

POWER RELAY

REVERSING

VALVE

STICK RELAY

REVERSING

VALVE RELAY

EXTERNAL FAN

RELAY

OPERATION

TIMER

FILTER

M

OUTDOOR UNIT

POWER RELAY

STICK RELAY

F M

INDOOR

FAN MOTOR

FM

R V

RELAY

WIRELESS RECEIV-

ING CIRCUIT

INDICATION

LAMP

BUZZER CIRCUIT

MICROCOMPUTER

CIRCUIT

INITIALIZING

AUTO SWEEP MOTOR

M

(AX-3T2)

(AX-3T3)

RESET

CIRCUIT

MICROCOMPUTER

CLOCK CIRCUIT

INDOOR UNIT

POWER SUPPLY

RAS-24CH2/RAC-24CH2

BLOCK DIAGRAM

MODEL RAS-18CH1/RAC-18CH1

DC FAN MOTOR

OPERATION CIRCUIT

WIRELESS REMOTE

CONTROLLER

ROOM TEMPERATURE

THERMISTOR

– 41 –

HEAT EXCHANGER

THERMISTOR

15 sec

30 sec

30 sec

15 sec

30 sec

30 sec

15 sec

30 sec

30 sec

+3
+2
+1

-1

-2

-3

-4

Set temperature

Start/stop switch
Fan relay H
Fan relay L
Fan relay S
Power relay
Stick relay
External fan relay
Reversing valve relay

Pilot lamp
Hot keep lamp

S

S

LHS

HSL

B

SL

S

L

H

2 sec

2 sec

2 sec

2 sec

30 sec

30 sec

H

BASIC MODE

(0.5)

(0.5) (0.5)

(0.5)

(0.5)

(0.5)

(0.5)

(0.5)

1 sec

1 sec

(1 sec)

Fan relay H
Power relay
Stick relay
External fan relay
Reversing fan relay

Timer relay

Indoor heat exchanger
thermistor temperature

T

1

Low-temperature input

T8
T9
T6

T7
T5
T3
T4

TEMPERATURE OF INDOOR HEAT

EXCHANGER THERMISTOR

PD CUT 1
PD CUT 2
PD CUT 3
FAN RELAY H
FAN RELAY L
POWER RELAY
STICK RELAY
EXTERNAL FAN RELAY
REVERSING VALVE RELAY

MODEL RAS-18CH1/RAC-18CH1//RAS-24CH2/RAC-24CH2

Operation mode

No.

Control function

Start/stop button,

1

basic mode

Timer

2

operation

OFF timer

ON timer

Fan Cooling Sensor dehumidification Heating Automatic

Start/stop button
Reservation
Cancel
Operation lamp
Timer lamp
Timer memory

Start/stop button
Reservation
Cancel
Operation lamp
Timer lamp
Timer memory

Start/stop button
Operation lamp

(OFF timer during stop) (Cancel)

(ON timer during operation)

(Cancel)

(Change of the reservation time)

(Change of the reservation time)

5

Circulation

3

mode

Thermostat operation
H

➞

HI

L

➞

MED

➞

LO

S

4

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

OFF
timer

Automatic

HI

MED

LO

➞

➞

ON

Operation in the previous

•
circulation mode

Operation in “HI” mode

•

Operation in “MED” mode

•

Operation in “LO” mode

•
Only circulation

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

(1) Strong

Start/stop button
Fan relay H

Stick relay

“HI”, “MED”, or “LO” operation is

•
executed according to the thermostat
signal. (Refer to “Thermostat operation”.)

Same as on the left.

•

Same as on the left.

•

Same as on the left.

•

(1) In case of “Automatic” mode

+3
+2

Set temperature

Start/stop button
Fan relay H
Fan relay L
Fan relay S
Power relay
Stick relay
External fan relay

Operation lamp

+1

-1

-2

-3

2 sec 2 sec2 sec

H S L S L H S

S L L

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).

Start/stop button
Reservation
Cancel
Operation lamp
Timer lamp
Timer memory

“LO” and “Stop” are repeated according to the thermostat

•

(OFF ON timer)

PM1:00 PM3:00 PM5:00

(ON OFF timer) (ON OFF timer during operation)

PM1:00 PM3:00 PM5:00 PM1:00 PM3:00 PM5:00 PM1:00 PM3:00 PM5:00

signal, independent of the setting.

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

temperature.

+3

(Set temperature) +
(Temperature shift amount)

Start/stop button
Fan relay S

Power relay
Stick relay

External fan relay

Operation lamp

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

•
min. OFF time also is 3 minutes.

+2
+1

-1

-2

-3

2 sec

30 sec

5 sec

5 sec

2 sec

2 sec

S S S

30 sec

• 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.

(2) Set temperature is higher than room temperature.

Set temperature

0.66 deg

0.33 deg

Start/stop button
Fan Speed S

Power relay
Stick relay

External fan relay

Operation lamp

-1

-2

-3

-4

2 sec

2 sec

30 sec

5 sec

2 sec

30 sec

2 sec

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).

(OFF ON timer during stop)

“HI”, “MED”, “LO”, and “Stop” are repeated according to the thermostat

•
signal and time.

“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.

•

Example for “HI” circulation mode

Air-blow mode (A) (B)

HL H

LL L

SS L

Automatic L

X

L

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 first time.

The “Automatic” speed mode

•
for each operation mode is used
independent of the setting.
(“Week” at the time of “Sensor
dehumidification”.)

The operation mode at the

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

Cooling The set temperature

➞

operation

at the start of

➞

Room temperature

shall be 27°C.

Sensor The set temperature
dehumidi- shall be 2 degrees
fication below the room

temperature at the
start of operation.

Heating The set temperature

shall be 23°C +
temperature shift
amount.

• 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 dehumidifica­tion” mode.

Heating load reduction and Pd cut

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

•

All relays are stopped by low-

.

5

.

7

temperature input.

•

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

6

•

Accepted only during heating
operation.

•

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

•

Reversing valve lock protection

The timer lamp flashes at the
time of stop.

– 43 –

Operation lamp

Timer lamp

Set

temperature

Start/stop switch

Sleep key

Operation lamp

Sleep key

Timer lamp

60 minutes

5 deg down

LO (sleep operation)

Set circulation

velocity

Start/stop switch
Thermostat signal
Preheating signal
Fan relay H
Fan relay L
Fan relay S
Power relay
Hot keep lamp

2 sec

30 sec 30 sec

15sec

30 sec 30 sec

"Strong" circulation

2 sec

15 sec

15 minutes-T

30 sec

30 sec

Completion

Defrosting
start

30 sec

30 sec

2 sec

10 sec

Start/stop switch
Defrosting signal
Preheating signal
Fan relay H
Fan relay L
Fan relay S
Power relay
Stick relay
External fan relay
Reversing valve relay
Heater relay

Operation lamp
Hot keep lamp

2 sec

10 sec

30 sec

60 sec

3 minutes

30 sec

60 sec

15 sec

Set circulation velocity

Set
temperature

Start/stop switch
Sleep key
Operation lamp
Timer lamp

60 minutes

2 deg up

LO (sleep operation)

No.

Control function

•

7

Preheating

8

operation

Defrosting

9

(including automatic
fresh defrosting).

Operation mode

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

Fan Cooling Sensor dehumidification Heating Automatic

Sleep operation is executed

•
for each operation mode.

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.

LO (sleep operation)

Set
temperature

Start/stop switch
Sleep key
Operation lamp
Timer lamp

Set circulation velocity

2 deg up

60 minutes

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.

Indoor heat exchanger
thermistor temperature

T

1

Fan relay H

Power relay
Stick relay
Outside fan relay

Operation lamp

Cooling strong

Min. 3 minutes

Fan relay S

Power relay
Stick relay
Outside fan relay

Operation lamp

Sensor dehumidification

60 minutes

5 deg down

60 minutes

30 sec 30 sec

T

5 deg down

LO (sleep operation)

LO (sleep operation)

30 sec 30 sec

15sec

2 sec

3 minutes

Set

temperature
Start/stop switch
Sleep key
Operation lamp
Timer lamp

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

•

Set
temperature

Start/stop switch
Sleep key
Operation lamp
Sleep key
Timer lamp

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

•

"Strong" circulation

Start/stop switch
Thermostat signal
Preheating signal
Fan relay H
Fan relay L
Fan relay S
Power relay
Hot keep lamp

Set circulation
velocity

Set circulation
velocity

2 sec

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.

Defrosting

Start/stop switch
Defrosting signal
Preheating signal
Fan relay H
Fan relay L
Fan relay S
Power relay
Stick relay
External fan relay
Reversing valve relay
Heater relay

Operation lamp
Hot keep lamp

2 sec

10 sec

(Reverse cycle defrosting)

TA

TB

(Silencing period)

TC

(Cycle balancing time)

TE

(Defrosting prohibition

time)

30 sec

30 sec

T

E

10 min.

+0

min.

-1

30 sec

30 sec

50 min.

+0

min.

-5

start

15 sec

T

A

30 sec

60 sec

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.

•

T

B

Completion

30 sec

2 sec

10 sec

T

C

15 minutes-T

30 sec

E

15 sec

T

A

30 sec

60 sec

3 minutes

Table 1 Specifications

Item
Operation switching

Automatic
Heating

Fan
Sensor

Yes
Yes

Yes
Yes

dehumidification
Cooling

Temporary switch
Service switch

Heating

Cooling
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

Yes

Yes (automatic)

NO
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes

No

dehumidification
Automatic blowing direction

Filter sign
Wireless mode

Yes
Yes

Cooling/Heating

Table 2 Sensor operation values

Item

Cooling, Sensor 16 17.6

ON temperature dehumidification 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

Other detailed specifications

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

7. The filter 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 flashing), 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.

– 45 –

Down

Up

❈ Swing start direction

Down

Up

“NICE
TEMPERA-

10

TURE”
reservation

● 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.

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.

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

is pressed or when the operation mode is changed.

● The air deflector control operation shown below is done when the operation

switch is turned off.

Item

3-way AUTO (Swing)

Specification

Cooling/
dehumidi­fying

Air
blowing

8

direction
control

Heating

The same as cooling ● dehumidifying

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

Table 1 Specifications

Item RAS-18CH1/RAS-24CH2

Automatic Yes
Heating Yes

Operation switching Sensor dehumidification 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 dehumidification No
Automatic blowing direction Yes
Filter sign Yes
Wireless mode Heat and Cool wireless

Other detailed specifications

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
dehumidification” 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
dehumidification”. It is same for “AUTO”
sensor dehumidification cooling “sensor
dehumidification” “cooling”.

3. The filter sign lights after 100 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 flickering), 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.

(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.

Table 2 Sensor operation values

Item

ON temperature

Thermostat operation (Thermostat relay)

power relay (°C)
Differential (°C)

Low-temperature defrosting

(T1)

Cooling, sensor
dehumidification

RAS-18CH1/RAS-24CH2
16 17.6
24 25.6

33.6

0.33

ON (°C) 4.0

Reset (°C) 12.0

– 47 –

REFRIGERATING CYCLE DIAGRAM

COMPRESSOR

COOLING, DEHUMIDIFYING, DEFROSTING

OUTDOOR UNIT

INDOOR UNIT

SERVICE V ALVE

SUCTION
TANK

ACCUMULATOR

ACCUMULATOR

REVERSING
VALVE

CHECKVALVE

CAPILLARY

STRAINER

STRAINER

SERVICE V ALVE

SINGLE-ENDED
UNION

SINGLE-ENDED
UNION

CAPILLARY

HEATING

OUTDOOR UNIT

COMPRESSOR

INDOOR UNIT

SERVICE V ALVE

SUCTION
TANK

REVERSING
VALVE

CHECKVALVE

CAPILLARY

STRAINER

STRAINER

SERVICE V ALVE

SINGLE-ENDED
UNION

SINGLE-ENDED
UNION

CAPILLARY

MODEL RAS-18CH1/RAC-18CH1

– 49 –

REFRIGERATING CYCLE DIAGRAM

MODEL RAS-24CH2/RAC-24CH2

COOLING, DEHUMIDIFYING, DEFROSTING

OUTDOOR UNIT

BY PASS

CAPILLARY

CHECK VALVE

CAPILLARY

CHECKVALVE

STRAINER

STRAINER

CHARGING

PIPE

CAPILLARY

SUCTION
TANK

COMPRESSOR

REVERSING
VALVE

P-VALVE

VACUUM PIPE

JOINT PIPE

CHECK
VALVE

SERVICE V ALVE

SERVICE V ALVE

ACCUMULATOR

INDOOR UNIT

SINGLE-ENDED
UNION

SINGLE-ENDED
UNION

HEATING

OUTDOOR UNIT

STRAINER

CHECK VALVE

CHECKVALVE

CHARGING

PIPE

BY PASS

CAPILLARY

CAPILLARY

STRAINER

SUCTION
TANK

COMPRESSOR

REVERSING
VALVE

P-VALVE

VACUUM PIPE

JOINT PIPE

CAPILLARY

SERVICE V ALVE

ACCUMULATOR

SERVICE V ALVE

INDOOR UNIT

SINGLE-ENDED
UNION

SINGLE-ENDED
UNION

– 50 –

DESCRIPTION OF MAIN CIRCUIT OPERATION

ON/OFF button

Timer reserve button
(Sleeping)

Operation lamp

Timer lamp

When OFF
timer
(sleeping)
is set

Start Stop Start

"OFF" time

When ON
timer is set

"ON" time

ON/OFF button

Timer reserve button

Operation lamp

Timer lamp

Stop

Start

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

– 51 –

2. Reset Circuit

12V

R511

ZD511

R512

0V

5V

Micro computer

26

(AX-3T2)
(AX-3T3)

RES

R514

Q512

R513

Q511

+

C511

–

R515

C512

0V

12V

DC12V Line

7V
5V

DC5V Line

Base

POWER ON

POWER OFF

Micro computer
Pin 26

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

5V

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.

– 52 –

3. Buzzer Circuit

R621

R712

C710

ZD701

0V

0V

R622

Receiver

Unit

R714

R713

12V

27

Micro computer

(AX-3T2)
(AX-3T3)

REMOCON I/P

12V

BZ1

B.Z

Q302

0V

R801

Micro computer

(AX-3T2)
(AX-3T3)

30

BUZZER

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.

5V

D302

D301

5. Receive circuit

R303

R306

87

65

IC301

2

(E

PROM)

12 4

3

5V

C301

0V

C302

D304

0V

D303

R302
R305

Micro computer

(AX-3T2)
(AX-3T3)

3
4

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

– 53 –

6. Service Operation Circuit

5V

Micro computer

(AX-3T2)

R606

(AX-3T3)

FORCE COOL 42

Cool
Normal

0V

● 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 “Stick relay” and “Power relay”.

– 54 –

INITIALIZE AT NEXT

OPERATION.

ONE SWING (CLOSING AIR DEFLECTOR)

1 DOWNWARD

2 UPWARD

START SWINGING

1 DOWNWARD

2 UPWARD

STOP AT THE MOMENT.

3 DOWNWARD

STOP AT THE MOMENT.

START SWINGING

1 DOWNWARD

2 UPWARD

3 DOWNWARD

STOP AT THE MOMENT.

STOP SWINGING TEMPORARILY.

START SWING AGAIN.

(SWING MODE IS CLEARED IF SWING COMMAND IS

INITIALIZE

1 DOWNWARD

TRANSMITTED DURING TEMPORARY STOP.)

2 UPWARD

INITIALIZE AT NEXT

INITIALIZE

1 DOWNWARD

ONE SWING (CLOSING AIR DEFLECTOR)

1 DOWNWARD

OPERATION.

INITIALIZING CONDITION OF EACH MODE.

2 UPWARD

STOP SWINGING AND MODE BECOMES INITIALIZING

CONDITION.

STOP

DURING ONE SWING

PRESENT CONDITION

EACH MODE

OPERATION OPERATION MODE AIR DEFLECTOR

INPUT SIGNAL OPERATING SPECIFICATION REFERENCE

AUTO SWING FUNCTION

STOP

KEY INPUT

STOP

AUTO COOL

COOL

FAN

AUTO DRY

DRY

DURING SWINGING

DURING

OPERATION

STOP

CIRCULATOR

DURING SWINGING

TEMPORARY STOP

INTERNAL FAN

ON

DURING SWINGING

AUTO DRY

DRY

CIRCULATOR

DURING

OPERATION

(THERMO. ON)

INTERNAL FAN

OFF

STOP

DURING ONE SWING

STOP

COOL

FAN

DRY

STOP

(THERMO. OFF)

MAIN SWITCHONMAIN SWITCH

DURING ONE SWING

STOP

DURING SWINGING

DURING

INITIALIZING

STOP

CIRCULATOR

EACH MODE

DURING

OPERATION

OFF

DURING SWINGING

EACH MODE

DURING

OPERATION

CHANGE OF

OPERATION

– 55 –

SERVICE CALL Q & A

Cooling operation

While cooling, the

Q1

compressor sometimes stops
abruptly.

Dehumidifying operation

The fan speed does not

Q2

change during a
dehumidifying operation.

Cold air comes out during a

Q3

dehumidifying operation.

The operation does not stop

Q4

even by raising the room
temperature setting of remote
control at a dehumidifying
operation.

Check whether frost sticks

A1

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

The fan speed is always LO

A2

at a dehumidifying operation.

To improve the dehumidi-

A3

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

At a dehumidifying operation,

A4

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.

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

In the dehumidifying mode,

Q5

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

A5

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

– 56 –

Heating operation

Air does not come out when

Q6

starting a heating operation.

Air does not come out

Q7

sometimes while in a heating
operation.

The fan speed is set to “HI”

Q8

or “MED” but the heating
operation starts with a LO fan
speed.

The operation stops during

Q9

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

It is not a trouble. The fan is

A6

stopped to avoid cold wind.

Defrosting is on. Wait for 5–

A7

10 minutes unit the outdoor
unit is defrosted.

The heating operation

A8

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.

If a heating operation is per-

A9

formed when the exterior
temperature is high, the op­eration may stop to protect
the equipment.

When starting the operation,
the heat exchanger is cold
and, therefore, the fan is
stopped.
Wait 2–3 minutes.

Q10

Q11

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

Auto fresh defrosting

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

It is not a trouble.

A10

When heating, the outdoor
fan is stopped to avoid ex­cessive pressure rise.

A11

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

– 57 –

Automatic operation

How is the automatic

Q12

operation mode determined?

At an automatic operation,

Q13

changing the fan speed
change switch does not vary
the fan speed.

According to the room

A12

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

The fan speed is automati-

A13

cally determined.

The room temperature

Q14

cannot be controlled at an
automatic operation.

It is automatically set as

A14

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

V

“ ” or lowered 3°C by “ V ”.

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

– 58 –

Common, etc.

There is a difference

Q15

between the room
temperature setting and
actual room temperature.

What will happen if the time

Q16

setting is changed while in a
timer operation?

In the “Automatic fan speed”

Q17

mode, the indoor fan
changes to MED and LO fan
speed.

There may be a difference

A15

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

A timer operation is

A16

performed until the time after
changing the time setting.

It is not a trouble. The cold

A17

wind preventive function
operates.

Set the temporary switch
normal.

Nice temperature reservation

In case of “ON” timer, the operation does not

Q18

start at a preprogrammed time but a little
earlier.

The time to start an operation is irregular

Q19

while preprogramming at the same time.

The “Nice temperature reservation” functions.

A18

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.

The “Nice temperature reservation” operates.

A19

The starting time depends on the room load.

– 59 –

Wireless remote controller

1) When the “Automatic”

Q20

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.

1) When the operation

A20

mode is “Automatic”, the
fan speed is
automatically fixed 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

V

“ ” or “ V ” button
changes 1°C within the
range of:
27±3°C when cooling,
23±3°C when heating.

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

Q21

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

The timer cannot be set.

Q22

The current time disap-

Q23

pears soon.

The room temperature is

A21

settable within the range of
16 - 32 and not beyond.

V

Is the current time set?

A22

The timer cannot be set
unless the clock is adjusted
correctly.

The current time disappears

A23

soon and the timer settting
indication takes a
precedence.

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

– 60 –

In spite of timer “Preprogram”,

Q24

the time setting is
extinguished.

Isn’t the time over the pre-

A24

programmed time?
As soon as the prepro­grammed time is reached, the
time setting disappears.

After selecting a

Q25

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

At a “Dehumidifying”

A25

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

– 61 –

TROUBLE-SHOOTING

No cooling or heating

Operates by setting the service
switch to forced cooling?

YES

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)

NO

11

power

between driver IC701 pin
relay and 0V?

No operation at all.
*1

Check the following parts and replace if faulty

NO

2) Varistor

3) Power switch

4) Thermal fuse for
therminal board

5) Thermal fuse for
Terminal board

Power relay abnormal

YES
Compressor does not turn at LO.

Remove and check the continuity across.1) Current fuse
Check whether the appearance is blackish or

not.
The resistance must be infinite. *2

Check the continuity between contacts.
(96°C) Continuity across

also check the fan motor and capacitor.
(102°C) Continuity across

check the electric parts and replace if abnormal.

*2 Before checking the varistor, detach a terminal.

*1 Before using the service switch,

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

➝ If there is no continuity,

➝ If there is no continuity,

Replace Power relay

Is the level LO (approx. 0.5V)
between driver IC701 pin
relay and 0V?

NO

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

NO

Is the level LO (approx. 0.5V)
between driver IC 701 pin
(Reversing valve relay) and 0V at
heating operation?

NO

10

stick

13

YES

YES

YES

Stick relay abnormal

Indoor fan motor or

Q904 abnormal

Reversing valve

relay abnormal

Replace Stick relay

Replace Reversing

valve relay

– 62 –

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

NO

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.

*4 Wait for 3 minutes before forced

re-operation by the service switch.

*3

Fan Speed

HI

MED

LO

RAS-18CH1

Cooling Heating Cooling Heating

32.6

28.0

24.0

Replace faulty part

CN6 BLUE-RED (V)

RAS-24CH2

30.0

25.0

22.5

32.6

28.0

24.0

32.6

27.6

25.0

– 63 –

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

1

5

sec.

–––––––– 1 time

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

Force cooling operation

5

2

sec.

––––––– 2 times

Unit is under forcible operation or
under balancing after forcible

(1) 4-way valve is not working.
(2) Heat-exchanger thermistor is

in disconnection.

(Only heating time)

Check force cooling switch at
indoor electrical.

operation.

DC Fan motor - over flow of

(1) Indoor - Fan is locked.

electricity

5

3

––– 10 times

sec.

Indoor - DC Fan motor has over

(2) Indoor - Fan motor damage.

flow of electricity.

(3) Indoor - control circuit board.

IC 401 Data read wrongly

5

4

––– 13 times

sec.

In case that data read from IC401
is wrong.

IC401 data is not in order.

5

6

5

sec.

5

sec.

––– 14 times

–– –– 15 times

( –– 0.5 second on, 0.5 second off.)

Heat exchanger thermistor
error

Heat exchanger thermistor open
or short-circuit detected.

Room thermistor error

Room thermistor error open or
short-circuit detected.

(1) Thermistor
(2) Indoor - control circuit board.

(1) Thermistor
(2) Indoor - control circuit board.

CAUTION

!

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

– 64 –

PARTS LIST AND DIAGRAM
INDOOR UNIT

MODEL : RAS-18CH1/RAS-24CH2

8

4

5

2

1

7

9

10

15

12

13

11

6

20

24

19

27

3

23

25

16

14

17

– 65 –

18

22

21

26

MODEL RAS-18CH1

NO.

1 PMRAS-51CHA1 001 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-51CHA1 005 1 CYCLE ASSY
8 PMRAS-51CHA1 020 1 FAN COVER

9 PMRAS-40CNH2 025 1 PIPE SUPPORT
10 PMRAS-18CH1 002 1 DRAIN PAN ASSY
11 PMRAS-51CHA1 00 8 1 AUTO SWEEP MOTOR
12 PMRAS-18CH1 001 1 P.W.B (LED)
13 PMRAS-18CH1 003 1 FRONT COVER ASSY

PART N0.

RAS-18CH1

Q’TY / UNIT

PARTS NAME

14 PMRAS-18CH1 004 1 FRONT PANEL
15 PMRAS-25CNH2 019 3 CAP
16 PMRAS-51CHA1 01 0 2 FILTER
17 PMRAS-51CHA1 01 1 1 REMOTE CONTROL ASSY
18 PMRAS-10C3M 003 1 REMOTE CONTROL SUPPORT
19 PMRAS-51CHA1 01 5 1 THERMISTOR SUPPORT
20 PMRAS-51CHA1 01 6 1 THERMISTOR
21 PMRAS-18CP2R 00 2 1 POWER SWITCH
22 PMRAS-51CHA1 00 6 1 P.W.B (MAIN)
23 PMRAS-51CHA1 01 3 1 P.W.B (POWER SW SUPPLY)
24 PMRAS-51CHA1 01 7 1 TERMINAL BOARD (FUSE)
25 PMRAS-51CHA1 01 8 1 THERM-FUSE FOR P.C.B
26 PMRAS-51CHA1 01 9 1 P.W.B (RECEIVER)
27 PMRAC-07CV1 006 1 TERMINAL BOARD (2P)

– 66 –

MODEL RAS-24CH2

NO.

1 PMRAS-51CHA1 001 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-63CHA1 001 1 CYCLE ASSY
8 PMRAS-51CHA1 020 1 FAN COVER

9 PMRAS-40CNH2 025 1 PIPE SUPPORT
10 PMRAS-18CH1 002 1 DRAIN PAN ASSY
11 PMRAS-51CHA1 00 8 1 AUTO SWEEP MOTOR
12 PMRAS-18CH1 001 1 P.W.B (LED)
13 PMRAS-18CH1 003 1 FRONT COVER ASSY

PART N0.

RAS-24CH2

Q’TY / UNIT

PARTS NAME

14 PMRAS-18CH1 004 1 FRONT PANEL
15 PMRAS-25CNH2 019 3 CAP
16 PMRAS-51CHA1 01 0 2 FILTER
17 PMRAS-51CHA1 01 1 1 REMOTE CONTROL ASSY
18 PMRAS-10C3M 003 1 REMOTE CONTROL SUPPORT
19 PMRAS-40CNH2 026 1 THERMISTOR SUPPORT
20 PMRAS-51CHA1 01 6 1 THERMISTOR
21 PMRAS-18CP2R 00 2 1 POWER SWITCH
22 PMRAS-63CHA1 00 2 1 P.W.B (MAIN)
23 PMRAS-51CHA1 01 3 1 P.W.B (POWER SW SUPPLY)
24 PMRAS-51CHA1 01 7 1 TERMINAL BOARD (FUSE)
25 PMRAS-51CHA1 01 8 1 THERM-FUSE FOR P.C.B
26 PMRAS-51CHA1 01 9 1 P.W.B (RECEIVER)
27 PMRAC-07CV1 006 1 TERMINAL BOARD (2P)

– 67 –

PARTS LIST AND DIAGRAM
OUTDOOR UNIT

MODEL : RAC-18CH1

13

14

18

17

16

12

15

8

9

7

11

19

10

6

21

20

24

2

23

1

4

5

22

3

– 68 –

5

4

1

8

9

15

7

6

18

17

25

14

16

13

10

11

12

22

3

23

26

20

24

21

19

2

PARTS LIST AND DIAGRAM
OUTDOOR UNIT

MODEL : RAC-24CH2

– 69 –

MODEL RAC-18CH1

NO.

1 PMRAC-18CH1 906 1 BASE

2 PMRAC-18CV3 901 1 COMPRESSOR

3 PMRAC-5142CHV1 902 3 COMPRESSOR RUBBER

4 PMRAC-51CHA1 908 1 VALVE (2S)

5 PMRAC-51CHA1 909 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-18CH1 902 1 COMPRESSOR CAPACITOR

12 PMRAC-14CH1 901 1 CAPACITOR 2.5µF

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

PART N0.

RAC-18CH1

Q’TY / UNIT

PARTS NAME

14 PMRAC-18CH1 903 1 CABINET

15 PMRAC-51CHA1 907 1 GRILL ASSY

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

17 PMRAC-40CNH2 921 1 NET

18 PMRAC-40CNH2 922 1 TOP COVER

19 PMRAC-18CH1 904 1 OVERLOAD RELAY COVER

20 PMRAC-18CH1 905 1 REVERSING VALVE COIL

21 PMRAC-51CHA1 904 1 REVERSING VALVE

22 PMRAC-51CHA1 905 1 STRAINER (CAPI)

23 PMRAC-51CHA1 910 1 STRAINER (COND)

24 PMRAC-18JHVP2 901 1 CHECK VALVE

– 70 –

MODEL RAC-24CH2

NO.

1 PMRAC-63CHA1 909 1 BASE

2 PMRAC-63CHA1 901 1 COMPRESSOR

3 PMRAC-63CHA1 908 3 COMPRESSOR RUBBER

4 PMRAC-51CHA1 908 1 VALVE (2S)

5 PMRAC-63CHA1 907 1 VALVE (5S)

6 PMRAC-63CHA1 903 1 CONDENSER

7 PMRAC-40CNH2 918 1 FAN MOTOR SUPPORT

8 PMRAC-51CHA1 906 1 FAN MOTOR

9 PMRAC-40CNH2 917 1 PROPELLER FAN

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

11 PMRAC-63CHA1 910 1 COMPRESSOR CAPACITOR

12 PMRAC-14CH1 901 1 CAPACITOR 2.5µF

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

PART N0.

RAC-24CH2

Q’TY / UNIT

PARTS NAME

14 PMRAC-18CH1 903 1 CABINET

15 PMRAC-51CHA1 907 1 GRILL ASSY

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

17 PMRAC-40CNH2 921 1 NET

18 PMRAC-40CNH2 922 1 TOP COVER

19 PMRA-139FF 903 1 OVERLOAD RELAY COVER

20 PMRAC-18CH1 905 1 REVERSING VALVE COIL

21 PMRAC-51CHA1 904 1 REVERSING VALVE

22 PMRAC-63CHA1 904 1 STRAINER (CAPI)

23 PMRAC-63CHA1 905 1 STRAINER (COND)

24 PMRAC-63CHA1 906 1 CHECK VALVE

25 PMRAC-63CHA1 902 2 CHECK VALVE

26 PMRAC-63CHA1 911 1 PRESSURE VALVE

– 71 –

RAS-18CH1 / RAC-18CH1

PM NO. 0162E

RAS-24CH2 / RAC-24CH2

Printed in Malaysia