Hitachi RAS-07CH4, RAS-09CH4 Service manual

NO. 0205E

RAS-07CH4/RAC-07CH4 RAS-09CH4/RAC-09CH4

SERVICE MANUAL

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY

RAS-07CH4 RAS-09CH4

REFER TO THE FOUNDATION MANUAL

CONTENTS

SPECIFICATIONS ............................................................... 5

HOW TO USE ..................................................................... 6

CONSTRUCTION AND DIMENSIONAL DIAGRAM ........ 32

MAIN PARTS COMPONENTS ......................................... 33

WIRING DIAGRAM ........................................................... 35

BASIC MODE .................................................................... 41

REFRIGERATING CYCLE ................................................ 46

AUTO SWING FUNCTION ............................................... 47

SERVICE CALL Q & A ..................................................... 48

PARTS LIST AND DIAGRAM ........................................... 53

RAC-07CH4 RAC-09CH4

SPECIFICATIONS

TYPE

MODEL RAS-07CH4 RAC-07CH4 RAS-09CH4 RAC-09CH4

POWER SOURCE 1Ø, 220 V, 50 Hz

TOTAL INPUT (W) 680 870

COOLING

HEATING

DIMENSIONS (mm) H 265 570 265 570

NET WEIGHT (kg) 7 26 7 26

TOTAL AMPERES (A) 3.15 4.1

CAPACITY

TOTAL INPUT (W) 630 860

TOTAL AMPERES (A) 3.0 4.1

CAPACITY

(kW) 2.05 2.50

(B.T.U./h) 7,000 8,500

(kW) 2.15 2.65

(B.T.U./h) 7,850 10,000

W 785 700 785 700

D 168 210 168 210

INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT

WALL TYPE

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

ROOM AIR CONDITIONER

INDOOR UNIT + OUTDOOR UNIT

MARCH 2004

H.A.P.M.

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.

First, I must disconnect the power cord plug

from the power outlet.

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

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

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

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

5. 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

DANGER

thinner

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

HITACHI IC401TH1 ,188UV

Conductive sponge

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.

Body earth (Elimik conductive band)

Fig. 2 Body Earth

– 1 –

Clip for connection with a grounding wire

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

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

Staple

Bare copper wire (for body earth)

Fig. 3. Grounding of the working table

Working table

Resistor of 1 MΩ (1/2W)

Earth wire

Soldering iron

Screw stop at the screwed part using a rag plate

Fig. 4. Grounding a soldering iron

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

Grounding wire

(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.

– 2 –

CAUTION

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 recommend to stop the operation and to disconnect the power cord plug from the power outlet for safety.

3. If the room air conditioner is stopped by setting the temperature or mis-operation, and then re-started in a moment, cooling 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.

4. This room air conditioner should not be used at the cooling operation when the outside temperature is below 20°C.

5. When the operation knob is set to “COOL” from another position, IC delay circuit functions and stops the compressor for the first 3 minutes, which is not an abnormal phenomenon.

– 3 –

The Length of Indoor Unit

Connecting Cord

about

0.9m

Do not alter the power cord.

Cut away shaded portion, and finish the edge of the opening so that there is no burr.

Connection

about 1.6m

Horizontally perpendicular to the unit

There are 3 directions allowed, namely, horizontally perpendicular to the unit, vertically down from right, horizontally out from right. Don’t form the piping downward at the left of the unit.

Figure showing the Installation of Indoor and Outdoor unit.

Be sure to completely seal any gap with putty.

above 300mm

about 0.45m

must not bend

above 100mm

above 50mm

above 100mm

2,300mm or more

Dimension of Mounting Stand

of the outdoor unit

(unit : mm)

mounting stand

500

225

100

above 50mm when installed on the ceiling of balcony

above 100mm

* above 200mm

above 200mm

Maximum pipe length 10m

Minimum pipe length 5m

* above 50mm

* give clearance

as wide as possible

above 200mm

Plug

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

The difference in height

•

between the indoor and outdoor unit should be kept below 5m. The connecting pipe, no

•

matter big or small, should all be insulated with insulation pipe and then wrapped with vinyl tape. (The insulator will deteriorate if it is not wrapped with tape).

The connection of insulated drain hose.

inner diameter ø 16mm

– 4 –

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

SPECIFICATIONS

MODEL RAS-07CH4 RAC-07CH4 RAS-09CH4 RAC-09CH4

FAN MOTOR 10 W 20 W 10 W 20 W

FAN MOTOR CAPACITOR 1 µF, 400 V 1.5 µF, 400 V 1 µF, 400 V 1.5 µF, 400 V

FAN MOTOR PROTECTOR

COMPRESSOR NO G333DB2Z NO G533QB9Z

COMPRESSOR MOTOR CAPACITOR NO 30 µF, 400 V NO 30 µF, 400 V

OVERLOAD PROTECTOR NO YES NO YES

OVERHEAT PROTECTOR NO NO NO NO

FUSE (for MICRO COMPUTER) 3.0 A NO

POWER RELAY G4A NO G4A NO

POWER SWITCH YES NO YES NO

TEMPORARY SWITCH YES NO YES NO

SERVICE SWITCH YES NO YES NO

TRANSFORMER YES NO YES NO

VARISTOR 450NR NO 450NR NO

YES (INTERNAL) YES (INTERNAL) YES (INTERNAL) YES (INTERNAL)

NOISE SUPPRESSOR NO NO NO NO

REMOTE CONTROL SWITCH (LIQUID CRYSTAL)

THERMOSTAT YES (IC) NO YES (IC) NO

FUSE CAPACITY 10 A TIME DELAY FUSE

UNIT -------- ❇ 630 g -------- ❇ 700 g

REFRIGERANT CHARGING VOLUME WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE (Refrigerant 22) PIPES TYPE.

❇ 630g for piping set of 5 ~ 8m. ❇ 700g for piping set of 5 ~ 8m.

YES NO YES NO

P - 105 VK1 (5m), P - 108 VK1 (8m)

– 5 –

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.

●

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

WARNING

CAUTION

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.

A R N

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.

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.

●

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

●

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

– 6 –

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 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 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.

●

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.

– 7 –

NAMES AND FUNCTIONS OF EACH PART

INDOOR UNIT

Air Filter

To prevent dust from coming into the indoor unit. (Refer page 24)

Suction Grille (Air Inlet)

Indoor unit Indicators

Light indicator showing the operation condition. (Refer page 9)

Horizontal Deflector • Vertical Deflector (Air outlet)

(Refer page 20)

Remote Control

Send out operation signal to the indoor unit. So as to operate the whole unit. (Refer page 10)

OUTDOOR UNIT

Drain pipe

Condensed water drain to outside.

Connecting cord

Air inlet (Back and left side)

Air outlet

Blow out warm air.

MODEL NAME AND DIMENSIONS

MODEL WIDTH (mm) HEIGHT (mm) DEPTH (mm)

RAS-07CH4, RAS-09CH4 785 265 168

RAC-07CH4, RAC-09CH4 700 570 210

– 8 –

OPERATION INDICATOR

TEMPORARY SWITCH

Temporary Switch

RAS-

POWER SWITCH

INDOOR UNIT INDICATORS

Press

about 7mm

Non-conductor Stick

Use this switch to start and stop when the remote controller does not work. [Use non-conductor stick (example toothpick)]

● 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.

RAS-

OPERATION LAMP

This lamp lights during operation.

TIMER LAMP

This lamp lights when the timer is working.

SIGNAL RECEIVER

There will be a beep sound when this receiver receives signal from remote control.

– 9 –

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 button

Use this button 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 button

● FUNCTION selector

Use this button to select the operating mode. Every time you press it, the

(AUTO) to (HEAT) to (DEHUMIDIFY) to

(AUTO) to (HI) to (MED) to (LOW)

RESET

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

mode will change from

(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 (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.

● 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.

– 10 –

AUTOMATIC OPERATION

The device will automatically determine the mode of operation, HEAT, COOL or DEHUMIDIFY depending on the initial room temperature. The selected mode of operation will not change when the room temperature varies.

Press the FUNCTION selector so that the display indicates the

(AUTO) mode of operation.

RESET

START

STOP

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

● When AUTO has been selected, the device will automatically

determine the mode of operation, HEAT, COOL or DEHUMIDIFY depending on the current room temperature.

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

have to press the

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

(START/STOP) button next time.

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

■ CONDITION OF AUTOMATIC OPERATION

● The selected mode of operation will not change during the operation even though the room temperature

change.

Initial room temperature (approx.)

Over 27°C COOL 27°C

23~27°C DEHUMIDIFY LOW

Under 23°C HEAT 23°C

➡

Function Temperature setting FAN SPEED

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

Slightly lower than the room temperature

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

– 11 –

HEATING OPERATION

Use the device for heating when the outdoor temperature is under 21°C. When it is too warm (over 21°C), the heating function may not work in order to protect the device.

Press the FUNCTION selector so that the display indicates the

(HEAT).

RESET

Set the desired fan speed with 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 button (the display indicates the setting).

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

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

(FAN SPEED) button (the

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.

– 12 –

DEHUMIDIFYING OPERATION

Use the device for dehumidifying when the room temperature is over 16°C. When it is under 15°C, the dehumidifying function will not work.

Press the FUNCTION selector so that the display indicates

(DEHUMIDIFY).

RESET

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).

STOP

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

START

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

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

(START/STOP) button next time.

■ 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.

– 13 –

COOLING OPERATION

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

Press the FUNCTION selector so that the display indicates the

(COOL).

RESET

Set the desired fan speed with 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 button (the display indicates the setting).

The range of 25-28°C is recommended as the room temperature for cooling. If the temperature setting is 27°C, the room temperature will be controlled at around 27°C.

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

(FAN SPEED) button (the

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

START

STOP

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

function does not start if the temperature setting is higher than the current room temperature (even though the lamp lights). The cooling function will start as soon as you set the temperature below the current room temperature.

have to press the

(START/STOP) button next time.

(OPERATION)

– 14 –

FAN OPERATION

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

Press the FUNCTION selector so that the display indicates the

(FAN).

RESET

FAN SPEED (AUTO) …

For the heating operation

START

STOP

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

● The fan speed will automatically change according to the temperature of

● When the difference of room temperature and setting temperature is

● When the room temperature reaches setting temperature, fan speed

Press the (FAN SPEED) button.

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

discharged air.

large, fan starts to run at HI speed.

changes to LOW automatically.

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.

– 15 –

HOW TO SET THE TIMER

RESET

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

OFF TIMER

ON TIMER

RESERVE

CANCEL

ON-Timer

●

The device will turn on at the designated times.

Time, Day, Month

After you change the batteries;

M D

OFF-Timer

Start

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

STOP

Stop

Set the current month and

day with the TIMER control button.

M D

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

Press the (ON-TIMER)

Start

button the (ON) mark blinks on the display.

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.

Press the (ON-OFF) button so that the (OFF) mark blinks.

Set the turn-off time

with the TIMER control

button.

Press the (RESERVE)

button.

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

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.

– 16 –

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