Hitachi RAS-50WX8, RAC-50WX8, RAS-D18EX3, RAC-D18EX3 Service Manual

TC

SERVICE MANUAL

TECHNICAL INFORMATION
INFORMATIONS TECHNIQUES

REFER TO THE FOUNDATION MANUAL
REPORTEZ-VOUS AU MANUEL DE BASE

ROOM AIR CONDITIONER

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LES SPECIFICATIONS ET PIECES DETACHEES PEUVENT CHANGER POUR ETRE AMELIOREES.

Printed in Japan (HRT)

FOR SERVICE PERSONNEL ONLY
RESERVE AU PERSONNEL

NO. 0783EF

RAS-50WX8 / RAC-50WX8
RAS-D18EX3 / RAC-D18EX3

TC NO. 0783EF

RAS-50WX8 / RAC-50WX8
RAS-D18EX3 / RAC-D18EX3

795
295
198

10

792 (+95)※

600

299 (+46)※

42

RAS-50WX8, RAS-D18EX3 RAC-50WX8, RAC-D18EX3

1ø, 220V - 230V, 50Hz

1,555 (155 - 2,200)

7.14 - 6.83

5.0 (0.9 - 5.2)

17,065 (3,072 - 17,748)

1,745 (155 - 2,200)

8.01 - 7.66

6.3 (0.9 - 7.5)

21,502 (3,072 - 25,598)

RAC-50WX8
RAC-D18EX3

RAS-50WX8
RAS-D18EX3

SPECIFICATIONS
CARACTERISTIQUES GENERALES

SPECIFICATIONS‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥
CARACTERISTIQUES GENERALES
HOW TO USE‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥
UTILISATION
CONSTRUCTION AND DIMENSIONAL DIAGRAM‥‥‥‥
DIMENSIONS DES UNITÉS
MAIN PARTS COMPONENT‥‥‥‥‥‥‥‥‥‥‥‥‥‥
PRINCIPAUX COMPOSANTS
WIRING DIAGRAM‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥
SCHÉMAS ÉLECTRIQUES
WIRING DIAGRAM OF THE PRINTED WIRING BOARD

‥‥‥

SCHÉMA ÉLECTRIQUE DU CIRCUIT IMPRIMÉ
BLOCK DIAGRAM‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥
ORGANIGRAMME DE CONTROLE
BASIC MODE‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 
MODE DE BASE
REFRIGERATING CYCLE DIAGRAM ‥‥‥‥‥‥‥‥‥
SCHÉMA DU CYCLE DE RÉFRIGÉRATION

DISASSEMBLY&ASSEMBLYPROCEDURE‥‥‥‥‥‥

PROCEDURE D'ASSEMBLAGE ET DESASSEMBLAGE
DESCRIPTION OF MAIN CIRCUIT OPERATION‥‥‥‥
DESCRIPTION DES PRINCIPAUX CIRCUITS ÉLECTRIQUES
SERVICE CALL Q&A ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥
MODE OPERATOIRE DE DEPANNAGE
TROUBLE SHOOTING‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥
DETECTION DES PANNES
PARTS LIST AND DIAGRAM‥‥‥‥‥‥‥‥‥‥‥‥‥
LISTE DES PIÉCES DE RECHANGE

CONTENTS

TABLE DES MATIERES

INDOOR UNIT + OUTDOOR UNIT

MARCH 2008 Hitachi Appliances, Inc.

8

9

32

36

39

43

53

57

82

84

94

156

164

204

OUTDOOR UNIT

UNITÉ EXTÉRIEURE

INDOOR UNIT

UNITÉ INTÉRIEURE

※After installation Après installation

TYPE TYPE

MODEL MODÈLE
POWER SOURCE  

SOURCED'ALIMENTATION(PHASE/TENSION/FREQUENCE)

TOTAL INPUT

PUISSANCE ABSORBEE TOTALE (W)

TOTAL AMPERES

AMPERES TOTAUX (A)

CAPACITY CAPACITE

(kW)

(B.T.U./h)

TOTAL INPUT

PUISSANCE ABSORBEE TOTALE (W)

TOTAL AMPERES

AMPERES TOTAUX (A)

CAPACITY CAPACITE

(kW)

(B.T.U./h)

W, L

DIMENSIONS DIMENSIONS   (mm) H, H

D, P

NET WEIGHT POIDS NET (kg)

DC INVERTER   INVERSEUR C.C.

INDOOR UNIT

UNITÉ INTÉRIEURE

OUTDOOR UNIT

UNITÉ EXTÉRIEURE

COOLING

RÉFRIGÉRATION

HEATING

CHAUFFAGE

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.

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 the 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 occurrence 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 1MΩ or more as measured by a 500V DC megger.

9. The initial location of installation such as window, floor or the other should be checked for being 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 after reinforced or
at a new location.

10. Any inflammable object must not be placed
about the location of installation.

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

Spray

gasoline

gasbombe

thinner

SAFETY DURING REPAIR WORK

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

1

2

3

4

5

DANGER

– 1 –

1. Avant de procéder à une réparation, veillez
à couper l'alimentation électrique.

2. Les pièces de rechange doivent être des pièces d'origine et le remplacement des pièces doit être réalisé

conformément aux instructions figurant dans le manuel d'entretien.

3. Après achèvement des réparations, les conditions

initiales doivent être rétablies.

4. Après toute intervention, le raccordement et le

cheminement des câbles électriques doivent être
rétablis comme à l'origine.

5. Toute modification au niveau de l'installation ne peut être effectuée que par une personne compétente.

Toute intervention ou modification par l'utilisateur lui-même est par conséquent à proscrire.

6. Les outils et les appareils de mesure qui doivent être employés pour effectuer l'entretien auront été

préalablement réglés ou étalonnés comme il convient.

7. Lors de l'installation d'une unité ayant subi une réparation, veillez à éviter tout accident dû à une décharge

électrique ou la chute d'un objet.

8. Pour vérifier l'isolement de l'appareillage, mesurer la résistance entre le cordon d'alimentation et la borne

de masse. Cette résistance doit au moins être égale à 1MΩ lorsque la mesure est effectuée avec un
mégohmmètre de 500V CC.

9. Avant la fixation de l'unité réparée, vérifiez que les fixations d'origine peuvent supporter l'appareil. Si ces

fixations vous paraissent défectueuses, renforcez-les si possible et dans le cas contraire, l'unité doit être
fixée à un autre endroit.

10. L'emplacement de l'installation doit être

éloigné de toute matière inflammable.

11. La mise à la masse doit être soigneusement

contrôlée; en cas de défaut, la borne de
masse doit être mise à la terre.

Il faut d'abord que je coupe
I'alim

entation électrique.

Aérosol

Essence

Dilunt

Bonbonne de gaz

PRECAUTIONS RELATIVES A LA SECURITE PENDANT LES REPARATIONS

Si vous constatez que les contacts d'un
composant électrique sont défectueux,
remplacez le composant et ne tentez pas
de réparer les contacts.

DANGER

1

2

3

4

5

– 2 –

WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS

1. Scope

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

2. Object parts

(1) Microcomputer

(2) Integrated circuits (I.C.)

(3) Field effective transistor (F.E.T.)

(4) P.C. boards or the like to 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.)

(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.

H

IT

A

C

H

I I

C

4

0

1

T

H

1

,

1

8

8

U

V

Fig. 1 Conductive container

A conductive polyvinyl bag

IC

IC

Conductive sponge

Fig. 2 Body earth

Body earth (Elimik conductive band)

Clip for connection with
a grounding wire

1MΩ

– 3 –

PREVENTION DES DOMMAGES AUX SEMI-CONDUCTEURS

1. Champ d'application

Pour éviter d'endommager les semi-conducteurs utilisés dans les unités, lors de chaque intervention

d'entretien ou de réparation, vous devez observer des précautions spéciales. Les mêmes précautions

doivent être prises lors de la manipulation d'organes défectueux qui doivent être retournés en usine.

2. Pièces détachées de l'appareillage.

(1) Microprocesseur

(2) Circuits intégrés (C.I.)

(3) Transistor à effet de champ (T.E.C)

(4) Circuits imprimés sur lesquels se trouvent implantés les composants (1) et (2).

3. Précautions de manipulation

(1) Pour transporter ou stocker un semi-conducteur, placez-le dans un emballage conducteur. Procéder de

même avec un composant défectueux.

(2) Lorsque vous maniqulez des composants qui ne sont pas protégés (par exemple pour les compter ou

les emballer), vous devez veiller à ce que votre corps soit électriquement relié à la terre. Pour cela,
portez un bracelet conducteur. Reliez le bracelet à une résistance de 1MΩ et celle-ci à la terre par
l'intermédiaire d'un conducteur.

(3) Veillez en outre à ce que vos vêtements ne viennent jamais en contact avec le composant même si

votre corps est relié à la terre.

(4) Déposez le composant sur une surface métallique correctement mise à la terre.

(5) Sous aucun prétexte, n'omettez de couper l'alimentation avant de procéder à une réparation sur un

circuit imprimé. Par ailleurs, l'intervention sur le circuit imprimé doit se faire alors que celui-ci repose
sur une surface métallique mise à la masse.

H

IT

A

C

H

I IC

4

0

1

T

H

1

,

1

8

8

U

V

Fig. 1 Emballage conducteur

Sac en polyvinyle
conducteur

C.I.

C.I.

Eponge
conductrice

Fig. 2 Mise à la terre du corps

Bracelet de mise à la terre du corps
(Bande conductrice Elimik)

Pince de connexion avec
fil de mise à la terre

1MΩ

– 4 –

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

Fig.4 Grounding a solder iron

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

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

of the measuring instrument shortcircuit a load circuit or the like.

Bare copper wire (for body earth)

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

Working table

Resistor 1MΩ(1/2W)

Earth wirte

Staple

Fig.3 Grounding of the working table

soldering iron

Grounding wire

Screw stop at the screwed
part using a rag plate

– 5 –

(6) Le fer à souder doit être alimenté par un câble à trois conducteurs (dont un pour la mise à la terre).

Fig.4 Mise à la terre d'un fer à souder

Vous pouvez également utiliser un fer à souder ordinaire dans la mesure où il est parfaitement

isolé (au moins 10MΩ sous 100V).

(7) Pendant le contrôle des circuits au cours des opérations d'entretien ou d'inspection, évitez à tout prix la

mise en court-circuit de la charge par les pointes de contact de l'appareil de mesure.

Fil de cuivre nu
(pour mise à la
terre du corps)

Surface métallique (aluminium, acier inoxydable, etc.)

Plan de travail

Résistance de
1MΩ (1/2W)

Câble de masse

Agrafe

Fig.3 Mise à la terre d'un plan de travail

fer à souder

Câble de masse

Poser ici une rondelle éventail et la visser

– 6 –

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

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

3. The room air conditioner dose not start automaticaly 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 (14˚F).

6. This room air conditioner (the reverse cycle) should not be used when the
outside temperature is below –15˚C (5˚F).

If the reverse cycle is used under this condition, the outside heat exchanger is

frosted and efficiency falls.

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

CAUTION

– 7 –

1. Dans certaines conditions et pendant un arrêt de fonctionnement, on peut
parfois entendre le bruit du réfrigérant circulant dans les canalisations; ce bruit
n'a rien d'anormal.

2. Pour des raisons de sécurité, il est conseillé, pendant un orage, d'arrêter le
fonctionnement du système en coupant l'alimentation électrique.

3. Pour éviter que le fusible ne fonde, le climatiseur ne démarre pas
automatiquement après une panne de secteur. La remise en marche suppose
une pression sur la touche START / STOP après un délai d'au moins 3 minutes
suivant l'arrêt.

4. Si le climatiseur est arrêté à la suite d'un réglage de thermostat, ou à cause
d'une fausse manoeuvre et qu'il est remis en route, il se peut que la
réfrigération ou le chauffage ne reprenne qu'après 3 minutes. Ce phénomène
est normal et dû à un relais temporisé. Ce relais temporisé a pour rôle
d'éviter que le fusible ne fonde ou que des composants ne soient
endommagés par une remise en service accidentelle.

5. Ce climatiseur ne doit pas être utilisé pour réfrigérer une pièce lorsque la
température extérieure est inférieure à –10˚C (14˚F).

6. Ce climatiseur ne doit pas être utilisé lorsque la température extérieure est
inférieure à –15˚C (5˚F).

En effet, dans ce cas, l'échangeur de chaleur extérieur gèle et le rendement

chute considérablement.

7. Quand l'échangeur de chaleur extérieur est givré, les gaz chauds peuvent
entraîner une vaporisation de l'eau accumulée sur la face avant. Ce n'est pas
un problème si à ce moment-là le ventilateur s'arrête et il se peut que de la
vapeur se dégage de l'échangeur de chaleur extérieur.

ATTENTION

– 8 –

MODEL

FAN MOTOR

FAN MOTOR CAPACITOR

FAN MOTOR PROTECTOR

COMPRESSOR

OVER HEAT PROTECTOR

OVERLOAD RELAY

FUSE (for MICRO COMPUTER)

POWER RELAY, STICK RELAY

POWER SWITCH

TEMPORARY SWITCH

SERVICE SWITCH

TRANSFORMER

VARISTOR

NOISE SUPPRESSOR

THERMOSTAT

REFRIGERANT CHARGING VOLUME
(R410A)

CHARGE EN RÉFRIGÉRANT
(R410A)

UNIT UNITÉ

PIPES
CANALISATIONS
(MAX. 30m)

SPECIFICATIONS CARACTERISTIQUES GENERALES

MODÈLE

MOTEUR DE VENTILATEUR

COMPRESSEUR

RELAIS DE SURCHARGE

INTERRUPTEUR D'ALIMENTATION

INTERRUPTEUR AUXILIAIRE

INTERRUPTEUR DE SERVICE

TRANSFORMATEUR

VARISTANCE

ANTIPARASITAGE

THERMOSTAT

CONDENSATEUR DE MOTEUR
DE VENTILATEUR

PROTECTION DU MOTEUR
DE VENTILATEUR

PROTECTION CONTRE LES
SURCHAUFFES

FUSIBLE
(pour MICROPROCESSEUR)

RELAIS DE PUISSANCE,
RELAIS AUTOEXCITE

REMOTE CONTROL SWITCH (LIQUID CRYSTAL)

INTERRUPTEUR DE TÉLÉCOMMANDE (CRISTAUX LIQUIDES)

YES (RAR-3U4)

OUI (RAR-3U4)

NO

NON

FUSE CAPACITY

CALIBRE DE FUSIBLE

RAS-50WX8, RAS-D18EX3

25W (DC35V)



NO NON

NO NON

NO NON

NO NON

YES OUI

NO NON

NO NON

NO NON

NO NON

YES (IC) OUI (IC)

RAC-50WX8, RAC-D18EX3

47W (DC380V)

EU1013E2

YES OUI

YES OUI

3A

G4A

NO NON

YES OUI

NO NON

450NR

NO NON

NO NON

WITHOUT REFRIGERANT BECAUSE COUPLING
IS FLARE TYPE.

SANS RÉFRIGÉRANT EN RAISON DU
RACCORDEMENT FLARE.

A INRUSH - WITH STAND TYPE

A RETARDE-AVEC STAND TYPE

NO NON

NO NON

NO NON

1,350g

– 9 –

HOW TO USE

MODEL RAS-50WX8 / RAC-50WX8, RAS-D18EX3 / RAC-D18EX3

– 3 –

ENGLISH

PRECAUTIONS DURING OPERATION

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

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

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

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.

When operating the unit with the door and windows opened, (the room humidity is always above
80%) and with the air deflector facing down or moving automatically for a long period of time,
water will condense on the air deflector and drips down occasionally. This will wet your furniture.
Therefore, do not operate under such condition for a long time.
If the amount of heat in the room is above the cooling or heating capability of the unit (for
example: more people entering the room, using heating equipments and etc.), the preset room
temperature cannot be achieved.

This appliance is not to be used by children or persons with reduced physical, sensory or mental
capabilities, or lack of experience and knowledge, unless they have been given supervision or
instruction. Children must be supervised not to play with the appliance.

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

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

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

C
A
U
T

I
O
N



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

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

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

Do not hang any laundry onto the moveable panels.
The moveable panels may get dislodged and may cause serious injuries.

SAFETY PRECAUTION

– 2 –



Please read the “Safety Precaution” carefully before operating the unit to ensure correct usage of the unit.
Pay special attention to signs of “ Warning” and “ Caution”. The “Warning” section contains matters which,
if not observed strictly, may cause death or serious injury. The “Caution” section contains matters which may
result in serious consequences if not observed properly. Please observe all instructions strictly to ensure safety.
The sign indicate the following meanings.

Please keep this manual after reading.

WARNING

PRECAUTIONS DURING INSTALLATION

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

Please ask your sales agent or qualified technician for the installation of 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.

Be sure to use the specified piping set for R410A. Otherwise, this may result in
broken copper pipes or faults.

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

Do not install near location where there is 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.

CAUTION





PRECAUTIONS DURING OPERATION

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

W
A
R
N

I
N
G



Do not insert a finger, a rod or other objects into the air outlet or inlet. As the fan
is rotating at a high speed, it will cause injury. Before cleaning, be sure to stop the
operation and turn the breaker OFF.

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

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



Make sure to connect earth line.

Indicates the instructions that must be followed.

The sign in the figure indicates prohibition.

PRECAUTIONS DURING SHIFTING OR MAINTENANCE

Should abnormal situation arises (like burning smell), please stop operating the unit
and turn off the circuit breaker. Contact your agent. Fault, short circuit or fire may
occur if you continue to operate the unit under abnormal situation.

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

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

If the supply cord is damaged, it must be replaced by the special cord obtainable
at authorized service/parts centers.

W

A
R
N

I
N
G



– 10 –

ENGLISH

– 2 –

Electrical Dust Collector

Negative ions are generated to capture all air-borne
dirt and dust particle.

Air cleansing filter

(Refer Instruction manual)

Air filter

To prevent dust from coming into the indoor unit.
(Refer Instruction manual)

Front panel
Moveable panel

It will be on when the air conditioner is operated and
off when the air conditioner is not in operation.
(Occasionally it may not be on during the operating
mode)

Horizontal deflector

Vertical deflector

(Air Outlet)

(Refer Instruction manual)

Indoor unit indicators

Light indicator showing the operating condition.
(Refer page 3)

WIDTH (mm)

795

MODEL

HEIGHT (mm)

295

DEPTH (mm)

198

Air cleansing filters are washable and can be use in 1 year time. Type number for this air cleansing
filter is <SPX-CFH20>. Please use this number for ordering when you want to renew it.
Air cleansing 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 1 year depending on application requirements.

NOTE

Moveable Panel

It will open up automatically when the air conditioner is in operation to allow a large quantity of air
flowing through as a sort of heat exchange; and it will close up automatically when the air conditioner
stopped operating. Avoid physical adjustments as it may damage the panels’ mechanisms.
Please do not touch the moving panels during operations as they may pinch your fingers.

RAS-50WX8(W) / RAS-50WX8(B)

RAS-D18EX3(W) / RAS-D18EX3(B)

Remote controller

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

RAC-50WX8 / RAC-D18EX3

600 650 299

Drain pipe

Condensed water drain to outside.

Connecting cord and insulation pipe for piping

Air inlet (Back and Left side)

Air outlet

NAMES AND FUNCTIONS OF EACH PART

INDOOR UNIT

OUTDOOR UNIT

MODEL NAME AND DIMENSIONS

– 3 –

FILTER LAMP

When the device is operated for a total of about 200
hours, the FILTER lamp lights to indicate that it is time
to clean the filter.

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 every one
hour when frost forms on the heat exchanger of the
outdoor unit, for 5–10 minutes each time.

SIGNAL RECEIVING PORT

TIMER LAMP

This lamp lights when the timer is working.

TEMPORARY SWITCH

Use this switch to star t and stop when the remote controller does not work.

By pressing the temporary switch, the operation is done in previously set operation mode.
When the operation is done using the temporary switch after the power source is turned off and turn on

again, the operation is done in automatic mode.

T

E

M

P

O

R

A

R

Y

S

W

I

T

C

H

TEMPORARY
SWITCH

Front panel

Moveable panel

Hand grip point

Lift the front panel

Hand grip point

Do not hold the moveable panel
when the front panel is in either
opened/closed position.

1. Opening up the front panel

Never try to force open/close the moveable panel manually.
Manually opening or closing the moveable panel may cause breakdowns (The moveable panel will
automatically close or open when the power supply is switched on or switched off and whenever the unit
is in operations or has stopped operating.

CAUTION



INDOOR UNIT INDICATORS

OPERATION INDICATOR

– 11 –

Minimum Maximum Minimum Maximum

Indoor Dry bulb °C21 32 20 27

Wet bulb °C15 23 12 19

Outdoor Dry bulb °C21 43 2 21

Wet bulb °C15 26 1 15

Note

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

-10°C (14°F).
The recommended maximum and minimum operating temperatures of the hot and cold sides
should be as below:

Cooling Heating

Pull toward the down direction.

1

2

1

When front panel is shaky, there is a possibility panel coming off and
falling down.
Do not apply extra force on the front panel when it is opened up in
the upright position.
Also frequent removal of the front panel from the front cover may
cause damage.



Initially press the left and the right sides of the
front panel and finally press the central portion
until you hear a clicking sound.

2. Closing the Front Panel

CAUTION

– 4 –

– 4 –

SILENT
LOW
MED
HI

AUTO

HEAT

DEHUMIDIFY

COOL

FA N
FA N SPEED

SLEEPING
STOP (CANCEL)

START (RESERVE)

START/STOP
TIME

TIMER SET
TIMER SELECTOR

ON TIMER
OFF TIMER

AUT
EXTENDED AIRFLOW
AIR PURIFIER

O SWING

REMOTE CONTROLLER

This controls the operation of the indoor unit. The range of control is about 7 meters. If indoor lighting is controlled
electronically, the range of control may be shorter.
This unit can be fixed on a wall using the fixture provided. Before fixing it, make sure the indoor unit can be controlled
from the remote controller.
Handle the remote controller with care. Dropping it or getting it wet may compromise its signal transmission capability.
After new batteries are inserted into the remote controller, the unit will initially require approximately 10 seconds to
respond to commands and operate.

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.

AIR PURIFIER button

Use this button to start air purifying function.

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)
to (SILENT) (This button allows selecting the optimal or preferred fan speed
for each operation mode).

AUTO SWING button

Controls the angle of the horizontal air deflector.

EXTENDED AIRFLOW button

Use this button to deliver faster and more comfortable air conditioning.A

TIMER control

Use this button to set the timer.

OFF-TIMER button Select the tur n OFF time.
ON-TIMER button Select the turn ON time.
RESERVE button Time setting reservation.
CANCEL button Cancel time reservation.

Precautions for Use

Do not put the remote controller in the following places.

Under direct sunlight.
In the vicinity of a heater.

Handle the remote controller carefully. Do not drop it on the floor, and protect it
from water.

Once the outdoor unit stops, it will not restart for about 3 minutes (unless you turn
the power switch off and on or unplug the power cord and plug it in again).

This is to protect the device and does not indicate a failure.
If you press the FUNCTION selector button during operation, the device may stop

for about 3 minutes for protection.

NAMES AND FUNCTIONS OF REMOTE CONTROL UNIT

– 12 –

– 5 –

The device will automatically determine the mode of operation, HEAT, COOL or DEHUMIDIFY depending on the current room
temperature. The selected mode of operation will change when the room temperature varies. However the mode of operation will
not change when indoor unit connected to multi type outdoor unit.

If there is a power failure, operation will be automatically restarted when the power is resumed with previous operation mode
and airflow direction.
(As the operation is not stopped by remote controller.)
If you intend not to continue the operation when the power is resumed, switch off the power supply.
When you switch on the circuit breaker, the operation will be automatically restarted with previous operation mode and airflow
direction.
Note: 1. If you do not require Auto Restart Control, please consult your sales agent or OFF by remote control.

2. Auto Restart Control is not available when Timer or Sleep Timer mode is set.

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

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

When AUTO has been selected, the device will automatically determine
the mode of operation, HEAT, COOL or DEHUMIDIFY depending on
the current room temperature. However the mode of operation will
not change when indoor unit connected to multi type outdoor unit.
If the mode automatically selected by the unit is not satisfactory,
manually change the mode setting (heat, dehumidify, cool or fan).

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

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

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

The preset temperature and the actual room temperature may vary
somewhat depending on conditions.
The display does not indicate the preset temperature in the AUTO mode.
If you change the setting, the indoor unit will produce a beep.

1

START

STOP

°

C

Press the (FAN SPEED) button, AUTO, LOW and SILENT is available.

VARIOUS FUNCTIONS

Auto Restart Control

AUTOMATIC OPERATION

ENGLISH

– 6 –

Use the device for heating when the outdoor temperature is under 21°C.
When it is too warm (over 21°C), the heating function may not work in order to protect the device.
In order to keep reliability of the device, please use this device above -15°C of the outdoor temperature.

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

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

(AUTO) : The fan speed changes automatically

according to the temperature of the air which
blows out.

(HI) : Economical as the room will become warm

quickly.
But you may feel a chill at the beginning.

(MED) : Fan speed slow.

(LOW) : Fan speed slower.

(SILENT) : Fan speed ultra slower.

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

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

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

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

1

2

3

START

STOP

Defrosting

Defrosting will be performed about once an hour when frost forms on the heat exchange of the outdoor
unit, for 5~10 minutes each time.
During defrosting operation, the operation lamp blinks in cycle of 3 seconds on and 0.5 second off.
The maximum time for defrosting is 20 minutes.
However, if it is connected to multi type outdoor unit, the maximum time for defrosting is 15 minutes.
(If the piping length used is longer than usual, frost will likely to form.)

HEATING OPERATION

– 13 –

– 7 –

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.
The preset room temperature may not be reached depending on the number of people present in the
room or other room conditions.

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.

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

The range of 20-26˚C is recommended as
the room temperature for dehumidifying.

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

2

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

(START/STOP) button next time.

START

STOP

Press the FUNCTION selector so that the display indicates

(DEHUMIDIFY).

The FAN SPEED is set at LOW or SILENT.

1

DEHUMIDIFYING OPERATION

ENGLISH

– 8 –

Use the device for cooling when the outdoor temperature is 21~43°C.
If in doors humidity is very high (80%), some dew may form on the air outlet grille of the indoor unit.

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

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 cool

quickly.

(MED) : Fan speed slow.

(LOW) : Fan speed slower.

(SILENT) : Fan speed ultra slower.

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

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

Press the

(START/STOP) button. Cooling operation starts
with a beep. Press the button again to stop operation. The
cooling function does not start if the temperature setting is
higher than the current room temperature (even though the
(OPERATION) lamp lights). The cooling function will start as
soon as you set the temperature below the current room
temperature.

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

(START/STOP) button next time.

1

2

START

STOP

3

COOLING OPERATION

– 14 –

ENGLISH

– 9 –

2

START

STOP

FAN SPEED (AUTO)

.....

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

For the heating operation

The fan speed will automatically change according to the temperature of
discharged air.
When the difference of room temperature and setting temperature is large,
fan starts to run at HI speed.
When the room temperature reaches setting temperature, fan speed changes
to LOW automatically.

When the difference of room temperature and setting temperature is large,
fan starts to run at HI speed.
After room temperature reaches the preset temperature, the cooling operation,
which changes the fan speed and room temperature to obtain optimum
conditions for natural healthful cooling will be performed.

For the cooling operation

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

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

Press the (FAN SPEED) button.

(HI) : The strongest air blow.

(MED) : Fan speed slow.

(LOW) : Fan speed slower.

(SILENT) : Fan speed ultra slower.

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

EXTENDED AIRFLOW

During operations, press the button to select the various operating modes
that will set the preferred air flow direction and will also adjust the air flow speed
to reach the furthest distance within its range. (During the cooling operating mode,
the air flow direction and air flow speed will return to their original settings after 3
hours of operations).

If the (EXTENDED AIRFLOW) button is pressed while the AUTO SWING
mode is set, the AUTO SWING mode is cancelled and the EXTENDED AIRFLOW
mode is set.
If the (AUTO SWING) button is pressed while the EXTENDED AIRFLOW
mode is set, the EXTENDED AIRFLOW mode is cancelled and the AUTO
SWING mode is set.
If the (EXTENDED AIRFLOW) button is pressed when the horizontal air
deflector stops at your preferred angle, the deflector will change to EXTENDED
AIRFLOW.
As the angle of the horizontal air deflector changes, the air may blow directly

onto the body.
During stop operation, press the button will activate dry function for several
minutes to protect the heat-excharge of indoor unit from mold and bad odour.

1

FAN OPERATION

– 10 –

Use this function for clean and comfortable air.

Press the button.

Operation start with the display indicates at any mode of
operation.

The indoor unit will generate a negatively-charged ion to
capture the finest and microscopic dust.

Press the button again to cancell the air purifying operation.

1

2

AIR PURIFYING OPERATION

– 15 –

ENGLISH

– 11 –

1

Set the ON-timer.

Set the current time at 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

Sleep timer

Indication

1 hour 2 hours 3 hours 7 hours

Sleep timer off

Sleep Timer: The device will continue working for the designated
number of hours and then turn off.
Point the signal window of the remote controller toward the indoor
unit, and press the SLEEP button.
The timer information will be displayed on the remote controller.
The TIMER lamp lights with a beep from the indoor unit. When the
sleep timer has been set, the display indicates the turn-off time.

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

2

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

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

How to Cancel Reservation

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

For heating:
In this case, the device will turn off

in 2 hours (at 1:38 a.m.) and it will
be turned on 6:00 next morning.

H

AM

H

AM

AM

Sleep

timer

Start

SLEEP

HOW TO SET THE SLEEP TIMER

– 16 –

ENGLISH

– 12 –

ON/OFF-Timer

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.

OFF-Timer

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

After you change the
batteries;

How to Cancel Reservation

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

1

Set the (TIME) button.

1

Press the (OFF-TIMER)
button. The (OFF) mark blinks
on the display.

1

Press the (ON-TIMER)
button the (ON) mark blinks
on the display.

2

Set the turn-off time
with the TIMER control
button.
Press the (RESERVE)
button.

3

Press the (ON-

TIMER) button so that the

(OFF) mark lights and

the

(ON) mark blinks.

NOTE

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

ON-Timer

Time

The device will turn on
at the designated times.

TIME

OFF TIMER

ON TIMER

RESERVE

CANCEL

AM
PM

STOP

Start

AM

Start

Stop

AM

Start Stop

PM

PM

AM

PM

HOW TO SET THE TIMER

– 13 –

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.

The time indication will disappear
automatically in 10 second.
To check the current time setting,
press the (TIME) button twice.

The setting of the current time is
now complete.

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

2

Press the

(TIME) button.

3

Set the current time with the

TIMER control button.

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

2

Set the turn-off time with the

TIMER control button.

The setting of turn-off time is now complete.

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

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

4

Set the turn-on time with the

TIMER control button.

5

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

press the (RESERVE) button.
The

(ON) mark starts lighting instead of flashing and the (RESERVED)

sign lights. A beep occurs and the

(TIMER) lamp lights on the indoor unit.

3

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

press the (RESERVE) button.
The

(ON) mar k starts lighting instead of flashing and the (RESERVED)

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

2

Set the turn-on time with the

TIMER control button.

Example:

The device will turn off at 10:30 p.m. and it will be turned on
at 7:00 a.m.
The settings of the turn-on/off times are now complete.

4

Press the (TIME) button again.
The time indication starts lighting
instead of flashing.

AM

PM

AM

PM

AM

PM

AM

PM

PM

AM

PMPMPM

PM

PMPMPM

PM

AMAMAM

AM

– 17 –

ENGLISH

– 14 –

1

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

2

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

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

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



Push and pull to the
direction of arrow

When you do not use the room air conditioner, set the circuit breaker to “OFF”.

If the remote controller does not work due to battery failure, press this switch to start and stop operation.

This temporary operation will be at the setting made most recently. (The unit will immediately go into
automatic operation once power is switched on.)

HOW TO EXCHANGE THE BATTERIES IN THE REMOTE CONTROLLER

CAUTION

TEMPORARY SWITCH

CIRCUIT BREAKER

– 15 –

Suitable Room Temperature Install curtain or blinds

Ventilation Effective Usage Of Timer

Do Not Forget To Clean The Air Filter

Please Adjust Suitable Temperature

For Baby And Children

Warning

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



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

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

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

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.

Caution

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



THE IDEAL WAYS OF OPERATION

– 18 –

– 16 –

The Air Conditioner And The Heat Source In The Room

Not Operating For A Long Time

When Lightning Occurs

Caution

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



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

Warning

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



OFF

Interference From Electrical Products

Caution

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



Inverter-type
fluorescent
lamp.

To prevent
interference,
place at least
1m away.

TV

FOR USER’S INFORMATION

ENGLISH

– 17 –

1

Open the front panel.

Pull up the front panel by holding it at both sides
with both hands.

2

Remove the filter.

Push upward to release the claws and pull out the
filter.

3

Attaching the air cleansing filters to the filter.

Attach the air cleansing filters to the frame by gently
compress its both sides and release after insertion
into filter frame.

4

Attach the filters.

Attach the filters by ensuring that the surface written
“FRONT” is facing front.
After attaching the filters, push the front panel at
three arrow portion as shown in figure and close it.

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

CAUTION

CAUTION

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

NOTE

In case of removing the air cleansing filters, please follow the above procedures.
The cooling capacity is slightly weakened and the cooling speed becomes slower when the air cleansing
filters are used. So, set the fan speed to "HIGH" when using it in this condition.
Do not operate the air conditioner without filter. Dust may enter the air conditioner and fault may occur.

Claws

(4 places)





AT TACHING THE AIR CLEANSING FILTERS

– 19 –

– 18 –

MAINTENANCE

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.

CAUTION

1

Open the front panel and remove the filter

Gently lift and remove the air cleansing filter from the air filter frame.

2

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

3

Re-insert the air cleansing 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.

CAUTION

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 filter as some detergent may deteriorate the filter electrostatic performance.

PROCEDURE





Servicing the electrical dust collector’s electrical terminals

1

Use the remote control to stop all operations and
remove the electrical power plug (or push the
circuit breaker to its “OFF” position)

2

Remove the front panel (For the front panel
removal instructions, refer to page 19)

3

Using a toothbrush, remove all dirt from the
electrical dust collector’s electrical terminals.

Brushing the electrical terminals with a toothbrush will
remove the dirt (must use a dry toothbrush).

4

Re-install the front panel (For the front panel re­installation instructions, refer to page 19) insert
the electrical plug (or push the circuit breaker to
its “ON” position)

Lift up to open the cover

Electrical dust collector’s
electrical terminals

CAUTION

Before servicing, use the remote control to switch off all operations and pull out the electrical plug (or push the
circuit breaker to its “OFF” position)
Do not touch the electrical terminals when the electrical dust collector is operating. High tension electrical power
may cause serious electric shocks.
Caution should be taken to prevent the electrical dust collector’s electrical terminals from coming into contact with
water, as it may cause serious electric shocks.



ENGLISH

– 19 –

2. Washable Front Panel

Remove the front panel and wash with clean
water.
Wash it with a soft sponge.
After using neutral detergent, wash thoroughly
with clean water.

When front panel is not removed, wipe it with
a soft dry cloth. Wipe the remote controller
thoroughly with a soft dry cloth.

Wipe the water thoroughly.
If water remains at indicators or signal
receiver of indoor unit, it causes trouble.

Method of removing the front panel.
Be sure to hold the front panel with both hands
to detach and attach it.



CAUTION

Do not splash or direct water to the body of the unit when cleaning
it as this may cause short circuit.
Never use hot water (above 40°C), benzine, gasoline, acid, thinner or
a brush, because they will damage the plastic surface and the coating.

Removing the Front Panel

When the front panel is fully opened with
both hands, push the right arm to the inside
to release it, and while closing the front panel
slightly, put it out forward.

Attaching the Front Panel

Move the projections of the left and right
arms into the Flanges in the unit and
securely insert them into the holes.

Arm

Projection

Hole

Flange

– 20 –

– 20 –

1

2

3

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

Is the earth line disconnected or broken?

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

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

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



CAUTION

Confirm

3. MAINTENANCE AT BEGINNING OF LONG OFF PERIOD

Running the unit setting the operation mode to
(FAN) 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.

Air

Blow

REGULAR INSPECTION

ENGLISH

– 21 –

When it does not operate

Is the fuse all right?
Is the voltage extremely high or low?
Is the circuit breaker “ON”?
Is the setting of operation mode different from other indoor units?

Is the air filter blocked with dust?
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?
Are the air inlets or air outlets of indoor and outdoor units
blocked?
Is the fan speed “LOW” or “SILENT”?

CONDITION CHECK THE FOLLOWING POINTS

Notes

In quiet operation or stopping the operation, the following phenomena may
occassionally occur, but they are not abnormal for the operation.
(1) Slight 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.

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

If the remote controller is
not transmitting a signal.

Do the batteries need replacement?
Is the polarity of the inserted batteries correct?

Remote controller
display is dim or blank.)

NOTE:

If the supply cord is damaged, it must be replaced by the special cord obtainable at authorized
service parts centers.

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.

The moveable panels are not moving

Check to ensure whether the front panels have been installed in a proper manner.

AFTER SALE SERVICE AND WARRANTY

WHEN ASKING FOR SERVICE, CHECK THE FOLLOWING POINTS.

– 21 –

UTILISATION

PRÉCAUTIONS À SUIVRE

MODÈLES RAS-50WX8 / RAC-50WX8, RAS-D18EX3 / RAC-D18EX3

未入稿

– 33 –

CONSTRUCTION AND DIMENSIONAL DIAGRAM

MODEL RAS-50WX8, RAS-D18EX3

Unit : mm

795

295

Horizontal air deflector

Discharge grill

Top air suction grill

47

560 20

Cabinet

Front panel

314

208

208

240 240

70about 370

Drain

Drain hose

Wide pipe

Narrow pipe

Drain cap connection port

When piping is
drawn from the left side,
exchange the drain
hose and the drain cap.

5

147

60 20

47

56

17.5

Mounting plate

INDOOR UNIT

47

3260196022

47

Vertical air deflector

198

– 34 –

DIMENSIONS DES UNITÉS

MODÈLE RAS-50WX8, RAS-D18EX3

UNITÉ INTÉRIEURE

795

295

Déflecteur d'air horizontal

Grille d'évacuation

Grille supérieure d'aspiration de l'air

47

560 20

Boîtier

Panneau avant

314

208

208

240 240

70Environ 370

Vidange

Tu yau de vidange

Grosse tuyauterie

Petite tuyauterie

Orifice de fixation du bouchon de vidange

Lorsque la tuyauterie est
connectée du côté gauche,
remplacez le tuyau de
vidange par le bouchon
de vidange.

5

147

60 20

47

56

17.5

Plaque de montage

47

3260196022

47

Déflecteur d'air vertical

198

Unité : mm

– 35 –

MODEL RAC-50WX8,RAC-D18EX3

68 60

202

Air
suction

91

162.5

299

27

345

(19)

Handle

792(26)

887

69

Air
outlet

589

600

(11)

157

Air
suction

Handle

Service space

10

500 147

320 (10)

37

12

340

57

Long holes for anchor bolt

（２-φ１２×１６ Ｌｏｎｇ ｈｏｌｅｓ φ8.0 bolt)

Notch for anchor bolt
(2-φ8.0 bolt)

above
100

above

200

50

above

200

above

Note:

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

Unit : mm

– 36 –

MODÈLE RAC-50WX8,RAC-D18EX3

68 60

202

Aspirationd'air

91

162.5

299

27

345

(19)

Poignée

792(26)

887

69

Sortiedel'air

589

600

(11)

157

Aspirationd'air

Poignée

Espacerequispourentretien

10

500 147

320 (10)

37

12

340

57

Longstrouspourverroudel'ancre

（２-φ１２×１６Longstrousφ8,0boulons)

Encochepourlesboulonsd'ancrage
(2boulonsφ8,0mm)

Supérieur
100

Supérieur

200

50

Supérieur

200

Supérieur

Remarqe:

1.200mmouplusd'espaceduserviceestexigé au-dessus de l'unité de plein air.



Unité : mm

– 37 –

MAIN PARTS COMPONENT PRINCIPAUX COMPOSANTS

THERMOSTAT THERMOSTAT

Thermostat Specifications Caractéristiques du thermostat

FAN MOTOR MOTEUR DE VENTILATEUR

Fan Motor Specifications Caractéristiques du moteur de ventilateur

MODEL MODÈLE

RAS-50WX8, RAS-D18EX3

THERMOSTAT MODEL  MODÈLE DE THERMOSTAT

IC C.I.

OPERATION MODE  MODE DE FONCTIONNEMENT

COOL RÉFRIGÉRATION HEAT CHALEUR

MODEL MODÈLES RAS-50WX8, RAS-D18EX3 RAC-50WX8, RAC-D18EX3

POWER SOURCE SOURCE D'ALIMENTATION DC : 5V, DC : 0 - 35V DC : 120 - 380V

OUT PUT

WATT DE SORTIE NOMINALE

25W 47W

ON MARCHE

15.7 (60.3) 16.7 (62.1)

OFF ARRET

15.3 (59.5) 17.3 (63.1)

ON MARCHE

23.7 (74.7) 24.7 (76.5)

OFF ARRET

23.3 (73.9) 25.3 (77.5)

ON MARCHE

31.7 (89.1) 32.3 (90.1)

OFF ARRET

31.3 (88.3) 32.7 (90.9)

TEMPERATURE
TEMPÉRATURE
˚C (˚F)

INDICATION
INDICATION

16

INDICATION
INDICATION

24

INDICATION
INDICATION

32

CONNECTION
CONNEXION

20˚C

(68˚F)

75˚C

(167˚F)

––– –––

––– –––

(Control circuit built in)
(Circuit de commande incorporé) (Circuit de commande incorporé)

(Control circuit built in)

M

WHT

RED

YEL

0-5V

0V

35V

5V

BLU
BLK

M

BLK

RED

WHT

15V

120-380V

0-6.5V

0V

YEL
BLU

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

BLEU JAUNE BRUN BLANC

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

GRIS ORANGE VERT ROUGE

BLK : BLACK PNK : PINK VIO : VIOLET

NOIR ROSE VIOLET

RESISTANCE VALUE
VALEUR DE RESISTANCE

(Ω)

– 38 –

COMPRESSOR COMPRESSEUR

Compressor Motor Specifications Caractéristiques du moteur de compresseur

CONNECTION
CONNEXION

RESISTANCE VALUE
VALEUR DE RESISTANCE

(Ω)

(U)

WHITE
BLANC

YELLOW
JAUNE

RED
ROUGE

(V)

M

M

M

(W)

MODEL MODÈLE RAC-50WX8, RAC-D18EX3

COMPRESSOR MODEL MODÈLE DE COMPRESSEUR EU1013E2

PHASE PHASE SINGL SIMPLE

RATED VOLTAGE TENSION NOMINALE DC280 - 330V

RATED FREQUENCY FREQUENCE NOMINALE 50 / 60Hz

POLE NUMBER NOMBER DE POLES 4

20˚C

(68˚F)

75˚C

(167˚F)

2M = 0.74

2M = 0.90

WHITE
BLANC

YELLOW
JAUNE

RED
ROUGE

– 39 –

BLU : BLUE

YEL : YELLOW

BRN : BROWN

WHT : WHITE

GRY : GRAY

ORN : ORANGE

GRN : GREEN

RED : RED

BLK : BLACK

PNK : PINK

VIO : VIOLET

WIRING DIAGRAM

MODEL RAS-50WX8 / RAC-50WX8

RAS-D18EX3 / RAC-D18EX3

CAUTION

The marked parts are very
important ones for safety.

INDOOR UNIT

OUTDOOR UNIT

CIRCUIT

SW POWER

BLK

BLK

REVERSING
VALVE

GRY

GRY

GRY

GRY

PNK

WHT
YEL
ORN
BLU
BRN
RED

PNK

GRN

FAN
MOTOR

ELECTRIC EXPANSION
VALVE

OUTDOOR
TEMPERATURE
THERMISTOR

DEFROST
THERMISTOR

OVER HEAT
THERMISTOR

COMPRESSOR

WHT

WHT

YEL

YEL

RED

RED

BLK

RED

WHT
YEL
BLU

WHT

25A
FUSE

MAIN P.W . B .

(

BRN

)

(

RED

)

BRN RED

LN

TERMINAL
   BOARD

(

BLK

)

(

WHT

)

BLK

WHT

(

GRN+YEL

)

GRN

CONNECTING
CORD

C

D

+

-

〜

〜

UVW

+

-

+

-

L001

〜

L002

CT1

〜

CN15

CN10

RED

CN9

BLU

CN8

WHT

-++-

CN13

CN13

5

CN14

10

CN14

CN11

CN11

5

CN12

CN12

CN6

WHT

RED

L2

L1

CN2

M

DIODE

STACK

VARISTOR2

2A FUSE

NF
COIL1

COIL

3A FUSE

POWER
RELAY

STACK

DIODE

SURGE ABSORBER

VARISTOR1

VARISTOR3

SYSTEM

POWER MODULE

GRY

YEL

BLU

RED

YEL

REACTOR

YEL

-

+

C003

C006

R001

C002

C001

R007

+

+

R011

R010

C011

C010

C014

C015

C013

C008

C012

C007

R002

RELAY

ICP

R008

(

GRN+YEL

)

POWER SOURCE

ＡＣ２２０-２３０Ｖ

50Hz

M

CN11

M

CN10

CN3

CN7

CN9

4321

CN2

9

CN2

INDOOR
FAN MOTOR

RED
BLK
WHT
YEL

BLU

GRY

WIRELESS REMOTE
CONTROL

CONTROL
P. W . B .

WIRED
REMOCON

H-LINK

1 23456

12V Rx Tx 0V

0V 12V Rec Send

M

CN1

GRY

CN4

AUTO SWEEP
MOTOR2

AUTO SWEEP
MOTOR1

INDICATION

,
TEMPORARY SW
AND
LIGHT RECEIVING UNIT
P. W . B .

BLK
BLK

11

M

4

D

C

BRN
RED

CONNECTING

TERMINAL BOARD

CORD

(

BRN

)

(

GRN&YEL

)

HEAT
EXCHANGER
THERMISTOR

ROOM

THERMISTOR

TEMPEATURE

FRONT PANEL
MOTOR

LIMIT
SWITCH

(

RED

)

IONIZER