Hitachi RAS-18GH5 User manual

NO. 0479E

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

ROOM AIR CONDITIONER

INDOOR UNIT + OUTDOOR UNIT

JANUARY 2011

Refrigeration & Air-Conditioning Division

SERVICE MANUAL

REFER TO THE FOUNDATION MANUAL

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY

(W)

(A)

(kW)

(B.T.U./h)

(W)

(A)

(kW)

(B.T.U./h)

(kg)

RAS-18GH5 RAC-18GH5

(WALL TYPE)

TYPE

MODEL

POWER SOURCE

TOTAL INPUT

TOTAL AMPERES

CAPACITY

TOTAL INPUT

TOTAL AMPERES

CAPACITY

DIMENSIONS

(mm)

NET WEIGHT

SPECIFICATIONS

1030

295

207

RAS-18GH5

CONTENTS

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

RAS-18GH5/RAC-18GH5

RAC-18GH5

COOLING

HEATING

INDOOR UNIT OUTDOOR UNIT

1 Ø, 50 Hz, 220 ~ 230

1550 ~ 1580

7.42 ~ 7.23

5.10

17,410

1640 ~ 1680

7.77 ~ 7.61

5.75

19,630

850

650

298

After installation

– 1 –

SAFETY DURING REPAIR WORK

1. In order to disassemble and repair

the unit in question, be sure to

disconnect the power cord plug

from the power outlet before starting

the work.

2. If it is necessary to replace any

parts, they should be replaced with respective genuine parts for the unit, and the replacement must be ef-

fected in correct manner according to the instructions in the Service Manual of the unit.

If the contacts of electrical

parts are defective, replace the

electrical parts without trying to

repair them.

3. After completion of repairs, the initial state

should be restored.

4. Lead wires should be connected and laid as

in the initial state.

5. 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 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 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.

11. Check the grounding to see whether

it is proper or not, and if it is found

improper, connect the grounding

terminal to the earth.

DANGER

First, I must disconnect

the power cord plug

from the power outlet.

– 2 –

WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS

1. Scope

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

tive manufacturers during maintenance and handling thereof. (They apply the same to handling of abnormal

goods such as rejected goods being returned).

2. Object parts

(1) Micro computer

(2) Integrated circuits (IC)

(3) Field-effect transistors (FET)

(4) P.C. boards or the like on which the parts mentioned in (1) and (2) of this paragraph are equipped.

3. Items to be observed in handling

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

in the same way).

Fig. 1. Conductive Container

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

ways use himself as a body earth. (Make yourself a body earth by passing one M ohm earth resistance

through a ring or bracelet).

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

taken.

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

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

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

Fig. 2. Body Earth

Body earth

(Elimik conductive band)

Clip for connection with a

grounding wire

A conductive polyvinyl bag IC

Conductive sponge

– 3 –

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

Bare copper wire (for body earth)

Working

table

Resistor of 1 M (1/2W)

Earth wire

Fig. 3. Grounding of the working table

Screw stop at the screwed

part using a rag plate

Soldering iron

Grounding

wire

Fig. 4. Grounding a soldering iron

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

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

the measuring instrument shortcircuit a load circuit or the like.

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

Staple

– 4 –

1. In quiet or stop operation, slight 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. In the event of power failure, the air conditioner will restart automatically in the previously selected mode

once the power is restored. In the event of power failure during TIMER operation, the timer will be reset

and the unit will begin or stop operating under a new timer setting.

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

there is occasion that the cooling and heating operation does not start for 3 minutes, it is not abnormal

and this is the result of the operation of IC delay circuit. This IC delay circuit ensures that there is no

danger of blowing fuse or damaging parts even if operation is restarted accidentally.

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

below 10°C (50°F).

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

–10°C (14°F).

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

CAUTION

– 5 –

RAC-18GH5

40 W

2.5 F,450V

YES (INTERNAL)

5KS205DAA

50 F, 450VAC

YES (INTERNAL)

YES(IC)

SPECIFICATIONS

MODEL

FAN MOTOR

FAN MOTOR CAPACITOR

FAN MOTOR PROTECTOR

COMPRESSOR

COMPRESSOR MOTOR CAPACITOR

OVERLOAD PROTECTOR

OVERHEAT PROTECTOR

FUSE (MICRO COMPUTER CIRCUIT)

POWER RELAY

POWER SWITCH

TEMPORARY SWITCH

SERVICE SWITCH

TRANSFORMER

VARISTOR

NOISE SUPPRESSOR

THERMOSTAT

REMOTE CONTROL SWITCH (LIQUID CRYSTAL)

FUSE CAPACITY

RAS-18GH5

30 W

–

3.15A

G4A

YES

450NR

YES(IC)

YES

20 A TIME DELAY FUSE

---------- ❈ 1450g

UNIT

PIPES (MAX. 15m)

REFRIGERANT CHARGING

VOLUME

(Refrigerant R410A) PIPES (MIN. 5m)

ADDITIONAL REFRIGERANT R410A

AT 15g PER EVERY METER IF

PIPE LENGTH MORE THAN 8m.

– 6 –

Figure showing the installation of Indoor and Outdoor unit

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

CAUTION

The indoor piping should

be insulated with the en-

closed insulation pipe. (If the

insulator is insufficient,

please use commersial

products).

inner diameter ø 16mm

The connection of insulated

drain hose.

Please use insulated drain

hose for the indoor piping

(commercial product).

The difference in height

between the indoor and

outdoor unit should be

kept max 10m.

The connecting pipe,

no matter big or small,

should all be insulated

with insulation pipe and

then warapped with vinyl

tape. (The insulator will

deteriorate if it is not

wrapped with tape).

Figure showing the Installation

of Indoor and Outdoor Unit.

Be sure to

completely

seal any

gap with

putty.

– 7 –

SAFETY PRECAUTION

●

Please read the “Safety Precaution” carefully before operating the unit to ensure correct usage of the unit.

●

Pay special attention to signs of “ Warning” and “ Caution”. The “Warning” section contains matters

which, if not observed strictly, may cause death or serious injury. The “Caution” section contains matters which

may result in serious consequences if not observed properly. Please observe all instructions strictly to ensure

safety.

●

The sign indicate the following meanings.

●

Please keep this manual after reading.

Make sure to connect earth line.

Indicates the instructions that must be followed.

The sign in the ﬁgure indicates prohibition.

PRECAUTIONS DURING OPERATION

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

●Do not insert a ﬁnger, a rod or other objects into the air outlet or inlet. As

the fan is rotating at a high speed, it will cause injury. Before cleaning, be

sure to stop the operation and turn the breaker OFF.

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

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

WARNING

PRECAUTIONS DURING INSTALLATION

●

Do not reconstruct the unit.

Water leakage, fault, short circuit or 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 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.

– 8 –

PRECAUTIONS DURING OPERATION

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

accident.

●When operating the unit with burning equipments, regularly ventilate the

room to avoid oxygen 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 place plants directly under the air ﬂow as it is bad for the plants.

●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.

●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.

●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 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.

– 9 –

INDOOR UNIT

NAMES AND FUNCTIONS OF EACH PART

Air ﬁlter

To prevent dust from coming into the indoor unit.

(Refer page 26)

Front panel

Indoor unit indicators

Light indicator showing the operating condition.

(Refer page 10)

Horizontal deﬂector ●Vertical deﬂector

(Air Outlet)

(Refer page 21)

Remote controller

Send out operation signal to the indoor unit. So as

to operate the whole unit.

(Refer page 11)

OUTDOOR UNIT

Drain pipe

Condensed water drain to outside.

Connecting cord and insulation pipe for piping

Air inlet (Back and Left side)

Air outlet

WIDTH (mm)

1030

850

MODEL

RAS-18GH5

RAC-18GH5

HEIGHT (mm)

295

650

DEPTH (mm)

207

298

MODEL NAME AND DIMENSIONS

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