Hitachi RAS-50FH5, RAC-50YH5, RAS-50YH5 Service Manual

CONTENTS

SPECIFICATIONS --------------------------------------------------------------4

HOW TO USE -------------------------------------------------------------------6

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

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

WIRING DIAGRAM ----------------------------------------------------------- 35

CIRCUIT DIAGRAM ---------------------------------------------------------- 39

PRINTED WIRING BOARD LOCATION DIAGRAM---------------- 43

BLOCK DIAGRAM ------------------------------------------------------------ 47

BASIC MODE ------------------------------------------------------------------ 49

REFRIGERATING CYCLE DIAGRAM ---------------------------------- 63

AUTO SWING FUNCTION------------------------------------------------- 64

DESCRIPTION OF MAIN CIRCUIT OPERATION ------------------ 65

SERVICE CALL Q & A ----------------------------------------------------- 96

TROUBLE SHOOTING ------------------------------------------------------ 99

PARTS LIST AND DIAGRAM------------------------------------------- 121

NO. 0364E

SERVICE MANUAL

PM

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY

RAS-50FH5/RAC-50YH5

RAS-50FH5

REFER TO THE FOUNDATION MANUAL

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

ROOM AIR CONDITIONER

FEBRUARY 2007

Refrigeration & Air-Conditioning Division

INDOOR UNIT + OUTDOOR UNIT

RAC-50YH5

(W)

(A)

(kW)

(B.T.U./h)

(W)

(A)

(kW)

(B.T.U./h)

W

H

D

(kg)

RAS-50FH5 RAC-50YH5

DC INVERTER (WALL TYPE)

TYPE

MODEL

POWER SOURCE

TOTAL INPUT

TOTAL AMPERES

CAPACITY

TOTAL INPUT

TOTAL AMPERES

CAPACITY

DIMENSIONS (mm)

NET WEIGHT

SPECIFICATIONS

780

280

220

9.5

COOLING

HEATING

INDOOR UNIT

OUTDOOR UNIT

1 PHASE, 50 Hz, 220-240V

1,780 (155 ~ 2,200)

8.14-7.50

5.00 (0.90 ~ 5.20)

17,070 (3,070 ~ 17,740)

3,070 (155 ~ 2,100)

9.00-8.30

6.50 (0.90 ~ 8.10)

22,180 (3,070 ~ 27,640)

850

650

298

45

HITACHI

DC INVERTER

T

E

M

P

O

R

A

R

Y

S

W

IT

C

H

– i –

DANGER

First, I must disconnect the power cord plug

from the power outlet.

SAFETY DURING REPAIR WORK

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

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

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

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

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

5. 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 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 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.

– 1 –

WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS

1. Scope

The Standards provide for items to be generally observed in carrying and handling semiconductors in relative 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) Integrated circuits (I.C.) (2) Field effective transistor (F.E.T.) (3) 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 1MΩ 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.

A conductive polyvinyl bag

IC

Conductive sponge

Fig. 1 Conductive container

Body earth (Elimik conductive band)

Clip for connection with a grounding wire

1MΩ

Fig. 2 Body earth

– 2 –

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

Working table

Resistor 1MΩ (1/2W)

Earth wire

Staple

Bare copper wire (for body earth)

Fig. 3 Grounding of the working table

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

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.

Soldering iron

Grounding wire

Screw stop at the screwed part using a rag plate

Fig. 4 Grounding a solder iron

➤

– 3 –

1. In quiet operation or stopping the running, 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. The room air conditioner does not start automatically after recovery of the electric power failure for

preventing fuse blowing. Re-press START/STOP button after 3 minutes from when unit stopped.

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

there is occasion that the cooling and heating operation does not start for 3 minutes, it is not abnormal and this is the result of the operation of IC delay circuit. This IC delay circuit ensures that there is no danger of blowing fuse or damaging parts even if operation is restarted accidentally.

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

below –10°C (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 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

– 4 –

SPECIFICATIONS

MODEL

FAN MOTOR

FAN MOTOR CAPACITOR

FAN MOTOR PROTECTOR

COMPRESSOR

COMPRESSOR MOTOR CAPACITOR

OVERLOAD PROTECTOR

OVERHEAT PROTECTOR

FUSE (for MICROPROCESSOR)

POWER RELAY

POWER SWITCH

TEMPORARY SWITCH

SERVICE SWITCH

TRANSFORMER

VARISTOR

NOISE SUPPRESSOR

THERMOSTAT

REMOTE CONTROL SWITCH (LIQUID CRYSTAL)

RAS-50FH5

35W

NO

–

NO

YES

NO

YES(IC)

YES

----------

40 W

NO

YES

3.0A

G4A

NO

YES

NO

450NR

YES

YES(IC)

NO

1400g

WITHOUT REFRIGERANT BECAUSE

COUPLING IS FLARE TYPE.

UNIT

PIPES (MAX. 20m)

REFRIGERANT CHARGING VOLUME (Refrigerant 410A)

RAC-50YH5

JU1013D

– 5 –

above 50mm

above 100mm

about 400mm

above 300mm

must not bend

above 100mm

2,300mm or more

1

2

Maximum pipe length 20m

Minimum pipe length 5m

above 200mm

above 700mm

above 200mm

above 50mm when installed on the ceiling of balcony

(

)

above 100mm

give clearance as wide as possible

Plug

The Length of Indoor Unit

Connecting Cord

Figure showing the Installation of Indoor and Outdoor Unit.

Direction of Piping

There are 4 directions allowed, namely, horizontally perpendicular to the unit, vertically down from right, horizontally out from right and horizontally out to left. Don’t form the piping downward at the left of the unit.

● 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 wrapped with vinyl tape. (The insulator will deteriorate if it is not wrapped with tape).

The connection of insulated drain hose.

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

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

inner diameter ø 16mm

Be sure to completely seal any gap with putty.

0.9m

1.6m

Connection

Horizontally perpendicular to the unit

!

CAUTION

•

The installation height of indoor unit must be 2.3m or more.

– 6 –

!

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.

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.

●

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

PRECAUTIONS DURING OPERATION

●

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

W

A R N

I

N

G

!

●

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.

●

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.

W

A R N

I N G

!

– 7 –

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.

●

This is not intended for use by young children or infirm persons unless they have been adequately supervised by a responsible person to ensure that they can use the appliance safely.

●

Young children should be supervised to ensure that they do not 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 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.

– 8 –

HITACHI

DC INVERTER

TEM

PO

R

A

RY

SW

IT

CH

HITACHI

INDOOR UNIT

NAMES AND FUNCTIONS OF EACH PART

Air filter

To prevent dust from coming into the indoor unit. (Refer page 25)

Front panel

Indoor unit indicators

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

Horizontal deflector

●

Vertical deflector

(Air Outlet)

(Refer page 20)

Remote controller

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

WIDTH (mm)

780

850

MODEL

RAS-50FH5

RAC-50YH5

HEIGHT (mm)

280

650

DEPTH (mm)

220

298

MODEL NAME AND DIMENSIONS

OUTDOOR UNIT

DRAIN PIPE

Condensed water drain to outside.

CONNECTING CORD

AIR INLET (BACK, LEFT SIDE)

AIR OUTLET

– 9 –

INDOOR UNIT INDICATORS

OPERATION INDICATOR

FILTER LAMP

When the device is operated for a total of about 100 hours, the FILTER lamp lights to indicate that it is time to clean the filter.

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.

TIMER LAMP

This lamp lights when the timer is working.

TEMPORARY SWITCH

Press

Temporary Switch

Non-conductor Stick

TEMPORARY SWITCH

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.

– 10 –

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

˚

CH

RESET

˚

CH

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.

● 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.

● 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) (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.

● 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.

– 11 –

RESET

AUTOMATIC OPERATION

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.

■ 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 and LOW is available.

VARIOUS FUNCTIONS

■ Auto Restart Control

● 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.

– 12 –

˚

C

RESET

˚

C

HEATING OPERATION

● Use the device for heating when the outdoor temperature is under 21°C.

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

● In order to keep reliability of the device, please use this device above -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 is HI at first and varies to MED

or LOW 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) : Fan speed slow.

(LOW) : Fan speed 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

– 13 –

DEHUMIDIFYING OPERATION

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

■ Dehumidifying Function

When the room temperature is higher than the temperature setting: The device will dehumidify the room, reducing the room temperature to the preset level. When the room temperature is lower than the temperature setting: Dehumidifying will be performed at the temperature setting slightly lower than the current room temperature, regardless of the temperature setting. The function will stop (the indoor unit will stop emitting air) as soon as the room temperature becomes lower than the setting temperature.

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

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

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

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 automatically. The FAN SPEED button does not work.

1

RESET

˚

C

˚

C

– 14 –

˚

C

RESET

˚

C

COOLING OPERATION

Use the device for cooling when the outdoor temperature is –10~43°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 or LOW 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.

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

– 15 –

RESET

FAN SPEED (AUTO)

.....

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

For the heating operation

● The fan speed will automatically change according to the temperature

of discharged air.

● When the difference of room temperature and setting temperature is

large, fan starts to run at HI speed.

● When the room temperature reaches setting temperature, fan speed

changes to LOW automatically.

● When the difference of room temperature and setting temperature is

large, fan starts to run at HI speed.

● After room temperature reaches the preset temperature, the cooling

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

For the cooling operation

FAN OPERATION

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

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

Press the (FAN SPEED) button.

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

1

2

START

STOP

– 16 –

HOW TO SET THE TIMER

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 current month and

day with the TIMER control 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, Day, Month

● The device will turn on

at the designated times.

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

OFF TIMER

ON TIMER

RESERVE

CANCEL

M D

AM

STOP

Start

AM

Start

Stop

PM

Start Stop

PM

AM

PM

RESET

– 17 –

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) mark 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.

PM PM

AM

PM

AM

PM

– 18 –

HOW TO SET THE SLEEP TIMER

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

44 44

1

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

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

2

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

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

How to Cancel Reservation

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

For heating:

In this case, the device will turn off in 2 hours (at 1:38 a.m.) and turn on early so that the preset temperature will be almost reached at 6:00 next morning.

SLEEP

H

AM

Sleep

timer

Start

H

– 19 –

Explanation of the sleep timer

The device will control the FAN SPEED and room temperature automatically so as to be quiet and good for people’s health.

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

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

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

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

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

sleep timer will be set as last setting.

● Sleep timer effective only once.

NOTE

– 20 –

ADJUSTING THE AIR DEFLECTOR

1

2

Adjustment of the conditioned air to the left and right.

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

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

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

● Use the horizontal air deflector within the adjusting range

shown on the right.

● When the operation is stopped, the horizontal air deflector

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

!

CAUTION

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

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

RESET

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

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

HITACHI

DC INVER

TER

Vertical

about 15

about 60

about 45

about 30

When cooling, dehumidifying

When heating

– 21 –

HOW TO EXCHANGE THE BATTERIES IN THE REMOTE CONTROLLER

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.

CAUTION

!

Push and pull to the direction of arrow

– 22 –

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

– 23 –

FOR USER’S INFORMATION

The Air Conditioner And The Heat Source In The Room

Not Operating For A Long Time

When Lightning Occurs

Caution

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

!

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

Warning

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

!

OFF

Interference From Electrical Products

Caution

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

!

Inverter-type fluorescent lamp.

To prevent interference, place at least 1m away.

TV

– 24 –

ATTACHING THE AIR CLEANSING FILTERS

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

4

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

CAUTION

!

CAUTION

NOTE

HITACHI

DC INVERTER

T

E

M

P

O

R

A

R

Y

S

W

IT

C

H

HITACHI

DC INVERTER

T

E

M

P

O

R

A

R

Y

S

W

IT

C

H

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.

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

● 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.

● Air cleansing filters are washable and reusable up to 20 times by using vacuum cleaner or water rinse

under running tap water. Type number for this air cleansing filter is <SPX-CFH11>. Please use this number for ordering when you want to renew it.

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

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.

– 25 –

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

2

3

!

CAUTION

PROCEDURE

HITACHI

DC INVERTER

T

EM

PO

RA

R

Y

SW

IT

CH

HITACHI

DC INVERTER

T

E

M

P

O

R

A

R

Y

S

W

IT

C

H

Open the front panel and remove the filter

● Gently lift and remove the air cleansing filter

from the air filter frame.

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.

● 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.

● 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.

NOTE:

● 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 3-6 months depending on application requirements.

– 26 –

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

HITACHI

DC INVERTER

● 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.

DC INVERTER

Projection

Flange

Hole

– 27 –

3. MAINTENANCE AT BEGINNING OF LONG OFF PERIOD

● Run the unit by setting the operation mode to

(COOL), the temperature to 32°C and the fan speed to HI for about half a day on a fine day, and dry the whole of the unit.

● Switch off the power plug.

1

2

3

REGULAR INSPECTION

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

Is the earth line disconnected or broken?

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

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

Air

Blow

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

!

CAUTION

Confirm

– 28 –

AFTER SALE SERVICE AND WARRANTY

WHEN ASKING FOR SERVICE, CHECK THE FOLLOWING POINTS.

When it does not operate

● Is the fuse all right?

● Is the voltage extremely high or low?

● Is the circuit breaker “ON”?

● Was the air filter cleaned?

● Does sunlight fall directly on the outdoor unit?

● Is the air flow of the outdoor unit obstructed?

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

heat in the room?

● Is the set temperature suitable?

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

– 29 –

MEMO

.....................................................................................................................................................................................

Please note: On switching on the equipment, particularly when the room light is dimmed, a slight brightness fluctuation

may occur. This is of no consequence.

The conditions of the local Power Supply Companies are to be observed.

Minimum Maximum Minimum Maximum

Indoor

Dry bulb °C2132 2027

Wet bulb °C1523 1219

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

21°C (70°F). The recommended maximum and minimum operating temperatures of the hot and cold sides should be as below:

Cooling Heating

– 30 –

CONSTRUCTION AND DIMENSIONAL DIAGRAM

MODEL RAS-50FH5

INDOOR UNIT

47

5

60

205

220

– 31 –

CONSTRUCTION AND DIMENSIONAL DIAGRAM FOR OUTDOOR

MODEL RAC-50YH5

Handle

Air suction

grille

10464

26 850

955

79

650

96

169.5

638

1010

10

320

340

Air outlet

340

2022 298

201

Handle

Holes for anchor bolt

(2-¿12)

Fixing hole

507 198

57

12 37

Notch for anchor bolt

(2-¿12 Notchs)

More than

100

More than

700

100

Service space

– 32 –

MAIN PARTS COMPONENT

THERMOSTAT

Thermostat Specifications

FAN MOTOR

Fan Motor Specifications

CONNECTION

TEMPERATURE °C (°F)

INDICATION

16

INDICATION

24

INDICATION

32

MODEL RAS-50FH5

THERMOSTAT MODEL IC

OPERATION MODE COOL HEAT

ON 16.7 (62.1) 20.0 (68.0)

OFF 16.0 (60.8) 20.7 (69.3)

ON 24.7 (76.5) 28.0 (82.4)

OFF 24.0 (75.2) 28.7 (83.7)

ON 32.7 (90.9) 36.0 (96.8)

OFF 32.0 (89.6) 36.7 (98.1)

M

RED

BLK

WHT

YEL

BLU

35V

5V

0V

0 ~ 5V

FG

MODEL

RAS-50FH5

POWER SOURCE DC 5V, 35V

DC360V

OUTPUT 25W

40W

(Control circuit built in)

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

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

BLK : BLACK PNK : PINK VIO : VIOLET

RED

360V

BLK

0V

WHT

15V

M

YEL

0~6V

BLU

0~15V

RAC-50YH5

– 33 –

WHITE

RED

YELLOW

MODEL

COMPRESSOR MODEL

PHASE SINGLE

RATED VOLTAGE AC 220 ~ 240 V

RATED FREQUENCY 50 Hz

POLE NUMBER 4

COMPRESSOR MOTOR

Compressor Motor Specifications

CONNECTION

20°C

(68°F)

75°C

(167°F)

( )

RESISTANCE VALUE

!

CAUTION

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

2M = 1.05

2M = 1.28

(U)

(V)

(W)

M

WHITE

YELLOW

RED

RAC-50YH5

JU1013D

MODEL RAS-50FH5 / RAC-50YH5

WIRING DIAGRAM

INDOOR UNIT

OUTDOOR UNIT

BLU

POWER RELAY

COIL

NF COIL 1

C003

C001

C002

VARISTOR1

L001

CT1

VARISTOR3

SURGE

ABSORBER

DIODE STACK

R010

L002

R011

C011

C010

FAN MOTOR

VARISTOR2

CN6 WHT

C008 C013 C015

M

WHT YEL

RED

WHT YEL

YEL

DIODE STACK

RED

UVW

REACTOR

SYSTEM POWER

MODULE 2

L2

L1

CN14

CN13

CN11

C503

C502C501

10

CN14

CN10 RED

CN9 BLU

CN8 WHT

CN15 WHT

CN13

CN11

5

CN12

RED

GRY

2A FUSE

ICP RELAY

R008R007

3A FUSE

25A FUSE

C006 R001

BLK GRN WHT

(WHT) (BRN) (RED)(BLK)

CONNECTING

CORD

BRN RED

BLK

GRN

RED

BLK WHT YEL BLU

POWER CIRCUIT

TERMINAL BOARD

(GRN+YEL)

LNCD

SINGLE PHASE

AC220~230V

50Hz

(GRN+YEL)

THERE ARE SOME LEAD WIRES WHICH HAVE SPIRAL STRIPES WITH WHITE IN ADDITION TO THE ORIGINAL COLOR

CN2 RED

MAIN P.W.B.

REVERSING VALV E

R002

C007 C012 C014

ELECTRIC EXPANSION VALV E

OH THERMISTOR

DEFROST THERMISTOR

OUTDOOR TEMPERATURE THERMISTOR

GRY

RED

COMPRESSOR

JUMPER

WIRE

INDOOR ROOM TEMPERATURE THERMISTOR

– 35 –

1 2

3

4 5 6 7 8

10 11

13 14 15 16 17

19 20

9

12

18

SEG19 SEG18 SEG17 SEG16 SEG21

SEG24 SEG25

SEG26 SEG27 SEG28

NC NC NC NC NC NC NC NC NC

SEG20

SEG5 SEG0 SEG1 SEG2 SEG3 SEG4

SEG5 SEG6 SEG7 COM3 COM2 COM1 COM0

SEG14

SEG13 SEG12 SEG11 SEG13

SEG9

SEG8

40 39 38 37 36 35 34 33

31 30

28 27 26 25 24

22 21

32

29

23

40 39

38 37 36 35 34 33

31 30

28 27 26 25

32

29

64

63

62

61

60

59

58

57

56

55

54

53

52

51

50

49

48 47

46

45

44

43

41

42

65 66 67 68 69 70 71 72

74 75

77 78 79 80

73

76

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17 18

19

20

21

22

24

23

SEG20 SEG21 SEG22 SEG23 SEG24 SEG25

SEG26 SEG27 SEG28

SEG29 SEG30 SEG31

SEG32

SEG33

SEG34 SEG35

SEG19

SEG18

SEG17

SEG16

SEG15

SEG14

SEG13

SEG12

SEG11

SEG10

SEG9

SEG8

SEG7

SEG6

SEG5

SEG4

SEG3

SEG2

SEG1

SEG0

SEG43

SEG42

SEG41

SEG40

P40

P41

P42

P43

P00

P01

P02

P03

P10

P11

P12

P13

D0

D1

D2

D3

D4

D5

D6

D7

D8

D9

BEEP

P20

P30 P31

NCVL C1

VL C2 VL C3 XC IN

XC OUT

VDD

X OUT

X IN

RESET

CARR

P23 P22

P21

VSS

IC 1 M3455OM6A-504FP

LCD 1

C8

50v/1u

K 1 D3 RB425D(1/2)

K2K3

K4

K5

P10

P11

P12

K6

K7 K8

K9 K10

K11K12

K18

K17

K15 K16

K13 K14

D0

D1

D2

D3

R1

100k

SW1

R2

P

100k

R3

100k

R4

100k

R5

Q1

2SC3443

or 2SC2982

R6

R7

R9

D2D1

D1 D2

EL-1L7

D3

(1/2)

RB425D

R10 12M

K19

X1

C9

R11

R15

R16

R13

R14

910kHz

105

104

150k

X2

kHz

C4

C5

C6

C7

18p

22p

R12 220k

220K

220k

100k

32.768

C1

C2

C3

220p

334

R6 R9

24(1/8W)

R8

330

SW-187-2P

Remote Control

CIRCUIT DIAGRAM

Key matrix table

Input

D3D2D1

D0

Output

Door open Automatic swingFan speed selectionOperation selectionStart/Stop

Door shut ––Automatic swingStart/Stop

Door open Day

• present timeHour downHour upOn timer

Door shut Fan speedRoom temperature downRoom temperature up–

Door open CancelReservation–Off timer

Door shut –––Sleep

P10

P11

P12

– 37 –

MODEL RAS-50FH5

CIRCUIT DIAGRAM

– 39 –

CIRCUIT DIAGRAM

MODEL RAC-50YH5

– 41 –

– 43 –

MODEL RAS-50FH5 MAIN P.W.B. MARKING ON P.W.B.

PRINGTED WIRING BORD LOCATION DIAGRAM

COMPONENT SIDE

SOLDERING SIDE

– 44 –

MODEL RAS-50FH5 RECEIVING P.W.B. MARKING ON P.W.B.

COMPONENT SIDE SOLDERING SIDE

– 45 –

MODEL RAC-50YH5

MAIN P.W.B.

Marking on P.W.B

EDISTNE

N OPM

O C

– 47 –

Wireless receive circuit

Filter. Operation. Timer.

Auto sweep motor for Air deflector

LCD wireless

Heat exchanger thermistor

Room temperature thermistor

Reset circuit

Initial setting circuit

Temporary switch

Electric Expansion valve drive circuit

Electric

Expansion

valve

)T8-XA(CIH/retupmocorcimroodtuO

Trip signal synthesis circuit

L N

RAS-50FH5 / RAC-50YH5

SPM2

Power source 1

, 50Hz, 230V

Outdoor unit Terminal board

) 11R7-XA(retu

p m

ocorcimroo

dnI

– 49 –

Notes:

1. The speed set of rotation for thefan motorin each operation mode are as shown in Table 1.

Same as at left. Performs the sleep operationof eachoperation mode.

Operating mode is judged by room temperature and outdoor temperature.

(1) Judging by outdoor tempe rature

Operating mode is judged by outdoor temperature. Only when the mode is not restricted by this judgment, the judgment by room temperature in the next paragraph will be performed. (a) Outdoor temperature

30 C: Restricted to cooling

(b) Outdoor temperature

9 C : Restricted to heating

(2) Judging by room tempe rature

Operating mode at start up is judged(initial judgment) (a) Conditions forjudgment (any of the followings)

When auto operation is started after 1hour has elapsed since the operation was stopped. When auto operation is started after thepr evious manual mode operation. When the operating mode is switched to auto while operating at manual mode.

(b) Judging method

Room temperature

23 C±3 C : Cooling

Room temperature < 23

C±3 C : Heating

±

3

C is the fine adjustment value from the remotecontrolle r.

Judging operating mode changedu r ing operation (Continuous judgment) (a) Conditions for judgment (a ny of the followings)

The mode is reviewedat every interval time. When auto operation is started again before1 hour has elapsed since the ope ration was stopped.

(b) Judging method

Judge by setting the hysteresis on the final preset temperature. The final preset temperature is the actually targeted preset temperature whichis the sum of the basic preset temperature and each type of shift value (e.g.±3

C by remote controller,preset temperature correction value, powerful shiftvalue, etc.).

[Currently cooling]

Room temperature

Final preset temperature Ð3 C Change to heating

Room temperature > Final preset temperature Ð3

C Continue cooling

[Currently heating]

Room temperature

Final preset temperature +2 C Change to cooling

Room temperature < Final preset temperature +2

C Continue heating

Set to Òultra-LoÓ, ÒLoÓ,ÒMedÓ, ÒHiÓ, Òultra-HiÓor ÒstopÓdepending onthe room temperature, time and heat exchangetemperature. Set to ÒstopÓ ifthe room temperature is 18

Cinthe

Òultra-LoÓ mode other thanduring preheating (cooling is recovered at18.3 3

C).

Set to Òultra-LoÓ, ÒLoÓ, ÒMedÓ,ÒHiÓ, Òultra-HiÓor ÒstopÓdepending onthe room temperature, and time. Set to ÒstopÓ ifthe roomtempe rature is 18

C in the Òultra-LoÓmode otherthan during

preheating (cooling is recoveredat 18.33

C). Set to Òultra-HiÓ when the compressor is runningat maximum speed during hot dash or when recovered from defrosting.

Set to Òultra-LoÓ, ÒLoÓ, ÒMedÓor ÒstopÓdepending onthe room temperature and tim e. Set to ÒstopÓ if the roomtemperature is 18

C in the Òultra-LoÓmode otherthan during preseating

(cooling is recovered at18.33

C).

Set to Òultra-LoÓ, ÒLoÓ, or ÒstopÓ depending on theroom temperature and time. Set to ÒstopÓif the room temperature is 18

C in the Òultra-LoÓmode otherthan during preseating (cooling is

recovered at 18.33

C).The fan speed is controlled by the heat exchanger temperature; the

overload control is executedas inthe followingdiagram:

See page 55.

Same as at left See page 57.

Set to ÒHiÓ in modes other than when the compressor stops.

Set to ÒMedÓ in modes other than when the compressor stops.

Set to ÒLoÓ in modes other than when the compressor stops.

See page 53.

Same as at left See page 53.

Set to Òultra-HiÓ when the compressor runs at maximum speed, and to ÒHiÓin othermode s.

1. Runs at ÒHiÓuntil firstthe rmo off after ope ration is sta rted.

2. Runs at ÒLoÓwhen thermo is off.

1. The indoor fanalso stops when the compressor is in stop status.

Changes between ÒLoÓ and ÒMedÓ depending on the room tempe rature.

Changes from ÒHiÓ toÒMedÓ or ÒLoÓ depending on room temperature.

Division 1 Division 2 Division 3 Division 4

Lo

Fan speedTemperature division

Lo Med Med

Same as at left.

See page 49.

Same as at left See page 51.

Operates at ÒHiÓ regardless of the room temperature.

Operates at ÒMedÓ regardless of the room temperature.

Operates at ÒLoÓ regardless of the room temperature.

Performs only fan operation at th e set speed regardless of the room temperature.

Enters sleep operation after se t as on the left. Action during sleep operation Lo (sleep) operation

Hi

)nafroodni(edomd

e epsnaF

Med

Lo

Basic operation of temperature controller

Sleep operation (with sleep button ON)

When the compressor is running at maxi mum speed during hot dash or when recovered from defrosting.

In modes other than left

42.66

C

37.66

32.66

29.66

Lo

Med

Med with overload

Lo

KAFON

Heat exchanger tempe rature

KAFOF

Hi or ultra-HI (fanspeed set

to auto)

Heat exchanger temperature

(Compressorstopped

forciblyfor 3 minutes)

Thermo iudgment

Temperatureset forcooling

Compressor

Hi Med Lo

AutoHeatingCooling

Dehumidifying

(dehumidifying operation by the function select button only,not including that engaged by the dehumidify button)

Fan

Operation mode

BASIC M O D E

Basic operation of start/stop switch

Off-timer

On-timer

sn o

i

tc nufr

em iT

Off -> On On -> Off timer

Auto

Start Stop

(Off-timer during stop)

(On-timer during operation)

ON ONONOFF OFF OFF ONOFF

(Change in reserved time)

(Off->On timer) (On->Off timer) (On->Off timer)

during operation)

(Off->On timer)

during stop)

Start Start/stop switch Operation tamp

Start/stop switch Operation tamp Cancel switch

Cancel switch

Reserve switch

Srart/stop switch

Operation temp

Timer tamp

Timer memory

Timer lamp

Operation lamp

Cancel switch

Reserve switch

Start/stop switch

Stop

Start/stopswitch Operationlamp

Hi

Hi Med Lo

na F

d e epS

Med Lo

Cooling

Heating

Room

-temperature 22

C

9

C30C

Outdoor temperature

Cooling

Heating

final preset temperature

– 51 –

Reversing valve (heating on mode)

NOTE (9)

Notes: (1) Condition for entering into Cool Dashed mode. When fan set to ÒHiÓ or ÒAuto modeÓ and temperature difference between indoor temperature and set temperature has a

corresponding compressor rpm (calculated value in Table 7) larger than WMAX.

(2) Cool Dashed will release when i) a maximum 25 minutes is lapsed and ii) room temperature is lower than set temperature Ð3

C (thermo off) and iii) when room temperature

has achieved setting temperature Ð1

C then maximum Cool Dashed time will be revised to 20 minutes. And iv) indoor fan is set to Lo and Med fan mode and v) change operation

mode.

(3) During Cool Dashed operation, thermo off temperature is set temperature (with shift value) Ð3

C. After thermo off, operation continue in Fuzzy control mode. (4) Compressor minimum ÒONÓ time and ÒOFFÓ time is 3 minutes. (5) During normal cooling mode, compressor maximum rpm CMAX will maintain for 60 minutes if indoor temperature is lower than CLMXTP. No time constrain if indoor temperature

is higher than CLMXTP. (6) When fan is set to ÒHiÓ, compressor rpm will be limited to CKYMAX. (7) When fan is set to ÒMedÓ, compressor rpm will be limited to CJKMAX. (8) When fan is set to ÒLoÓ, compressor rpm will be limited to CBEMAX. (9) During Cool Dashed, when room temperature reaches set temperature Ð1

C compressor rpm is actual rpm x DWNRATEC.

Temperature Calculated

difference compressor rpm

1.66 2265 min

Ð1

2 2435 min

Ð1

2.33 2600 min

Ð1

2.66 2765 min

Ð1

3 2935 min

Ð1

3.33 3100 min

Ð1

3.66 3265 min

Ð1

4 3435 min

Ð1

4.33 3600 min

Ð1

4.66 3765 min

Ð1

5 3935 min

Ð1

5.33 4100 min

Ð1

5.66 4265 min

Ð1

6 4435 min

Ð1

6.33 4600 min

Ð1

6.66 4765 min

Ð1

7 4935 min

Ð1

7.33 5100 min

Ð1

7.66 5265 min

Ð1

8 5435 min

Ð1

8.33 5600 min

Ð1

8.66 5765 min

Ð1

9 5935 min

Ð1

9.33 6100 min

Ð1

9.66 6265 min

Ð1

10 6435 min

Ð1

10.33 6600 min

Ð1

10.66 6765 min

Ð1

11 6935 min

Ð1

Table 2DTCMAX

Note:

1. See the data in Table 1 on page 47 for each constant in capital letters in the diagrams.

– 53 –

Room temperature

(Cooling/dehumidifying set temperature (temperature set by remote control (+) SHIFTC)

Set temperature during rhythm (temperature set by remote control (+) SFTRZM)

Final set temperature

Thermo judgment

Indoor fan

Outdoor fan

m h

tyh r

lo oc we N

de ep s

r os ser

pm o

C

Hi

5 sec. 5 sec.

1 cycle

2.5 sec. 2.5 sec.

Thermo OFF

2.5 sec.

4.5 sec.

Lo

Rhythm Med

See basic operation.

Lo

15 sec.

Lo

Rhythm Lo

Med

Minimum 5min.

Minimum 5min. Minimum 5min.

5min.

Minimum

5min.

Minimum

5min.

Minimum

5min.

5min.5min.

Notes:

(1) New cool rhythm is engaged when the fan speed is “auto” and the room temperature is less than

set one plus 0.66

C in the “auto” operation mode or cooling mode. (2) The minimum new cool rhythm time is 10 minutes when the temperature falls and rises. (3) Cool rhythm is not engaged during Nice temperature, Sleep operation. (4) Pl control is engaged during new cool rhythm: the speed limit is the same as during normal operation. (5) The new cool rhythm set temperature is also shifted during thermo OFF.

New Cool Rhythm

Notes:

(1) The sleep operation starts when the sleep key is pressed. (2) When the sleep key is set, the maximum compressor speed is limited, and the indoor fan is set to “sleep Lo”. (3) 30 minutes after the sleep key is set, the sleep shift of temperature starts, and upper shift is made at least 6 times. If 25

C

is not reached after 6 shifts, shifts repeat unit 25

C is reached.

(4) The sleep shift upper value of set temperature is 28

C.

(5) After 6 hours, a shift down to the initial set temperature is made at a rate of 0.33

C/5 min.

(6) If the operation mode is changed during sleep operation, the set temperature is cleared, and shift starts from the point when

switching is made. (7) The indoor fan speed does not change even when the fan speed mode is changed. (8) When operation is stopped during sleep operation, the set temperature when stopped, as well as the time, continue to be

counted. (9) If the set lime is changed during sleep operation, all data including set temperature, time, etc. is cleared and restarted. (10) If sleep operation is canceled by the cancel key or sleep key, all data is cleared.

Cooling Sleep Operation

de e

ps rosse

r pmoC

Horizontal air deflector

Shut

Horizontal

Facing down

Maximum speed

Indoor fan

Outdoor fan

Timer lamp

Operation lamp

Sleep key

(Cooling/dehumidifying set temperature = Remote control set temperature (+) SHIFTC)

Final set temperature (Cooling/dehumidifying set temperature (+) sleep shift)

Set to 7 hours

0.5hr 1.5hr

3hr

P1

2.5hr 3.5hr 6hr 7hr

Hi

See basic operation

Med

Lo (sleep)

Lo

Reverse cycle period

MAX. 12min. 3000

min–1

fixed

– 55 –

+

Delay

C33.1

C

66.0

Notes:

(1) If the room temperature is (cooling preset temperature) - (1.33

C) or less after 30 seconds from starting the operation, the operation is done assuming

as the preset temperature = (room temperature at the time) - (2

C). (2) The indoor fan is operated in the Lo mode. During thermo OFF indoor fan will be OFF for 5 minutes and ON for 1 minute. (3) When the operation is started by the themostat turning ON, the start of the indoor fan is delayed 32 seconds after the start of compressor operation. (4) The compressor is operated forcedly for 3 minutes after operation is started. (5) The minimum ON time and OFF time of the compressor are 3 minutes.

– 57 –

33.1 .C

WSD

T FS

66.0 .C

Fan speed set to "auto"

1 min.

Hi

Lo Hi Hi Hi

ultra Hi

Basic Heating Operation

Start

Stop Start Start StopStop

Thermo

OFF

Thermo

OFF

Heating set temperature (remote control set temperature (+))

Start/stop switch

Thermo judgment

Indoor fan

Ultra-Hi Hi Med Lo Ultra-Lo

Operation lamp

Max.

Rating

3000

0

d eep

s rosser

p moC

Outdoor fan

Reversing valve (heating "on" model)

Thermo OFF

Dash period

XAMWT

Wtd

Defrost signal

Preheating judgment

30sec. 30sec.

10sec.

15sec. 15sec.

15sec. 15sec. 15sec.

10sec.

15sec.

150sec. Delay

150sec. Delay150sec. Delay

3min.

Max. 3 min.

Preheating released

Control by heat exchanger temperature

15sec.

Control by heat exchanger temperature

18˚C

10sec.

30sec. 30sec.

10sec.

30sec. 30sec.30sec. 30sec. 30sec. 30sec.

10sec.

Preheat released

WMIN

(WSTD)

(WMAX)

NOTE (11)

WMAX2

Notes: (1) Condition for entering into Hot Dashed mode. When fan set to “Hi” or “Auto mode” and i) Indoor temperature is lower than 18

C, and ii) outdoor temperature is lower than 10 C,

and iii) Temperature difference between indoor temperature and set temperature has a corresponding compressor rpm (calculated value in Table 3) larger than WMAX. (2) Hot Dashed will release when i) Room temperature has achieved the set temperature + SFTDSW. ii) Thermo off. (3) During Hot Dashed operation, thermo off temperature is set temperature (with shift value) +3

C. After thermo off, operation continue in Fuzzy control mode. (4) Compressor minimum “ON” time and “OFF” time is 3 minutes. (5) During normal heating mode, compressor maximum rpm WMAX will maintain for 120 minutes if indoor temperature is higher than 18

C. No time limit constrain if indoor temperature

is lower than 18

C and outdoor temperature is lower than 2 C. (6) During Hotkeep or Defrost mode, indoor operation lamp will blink at interval of 3 seconds “ON” and 0.5 second “OFF”. (7) When heating mode starts, it will enter into Hotkeep mode if indoor heat exchanger temperature is lower than YNEOF + 0.33

C. (8) When fan is set to “Med” or “Lo”, compressor rpm will be limited to WBEMAX. (9) In “Ultra-Lo” fan mode, if indoor temperature is lower than 18

C, indoor fan will stop. If indoor temperature is higher than 18 C + 0.33 C, fan will continue in “Ultra-Lo” mode.

During Hotkeep or Defrost mode, fan will continue in “Ultra-Lo” mode.

(10) During Hot Dashed or outdoor temperature is lower than –5

C, compressor rpm is WMAX2.

(11) During Hot Dashed, when room temperature reaches set temperature + SFTDSW compressor rpm is actual rpm x DWNRATEW.

Temperature Calculated

difference compressor rpm

1.66 1965 min

–1

2 2135 min

–1

2.33 2300 min

–1

2.66 2465 min

–1

3 2635 min

–1

3.33 2800 min

–1

3.66 2965 min

–1

4 3135 min

–1

4.33 3300 min

–1

4.66 3465 min

–1

5 3635 min

–1

5.33 3800 min

–1

5.66 3965 min

–1

6 4135 min

–1

6.33 4300 min

–1

6.66 4465 min

–1

7 4635 min

–1

7.33 4800 min

–1

7.66 4965 min

–1

8 5135 min

–1

8.33 5300 min

–1

8.66 5465 min

–1

9 5635 min

–1

9.33 5800 min

–1

9.66 5965 min

–1

10 6135 min

–1

10.33 6300 min

–1

10.66 6465 min

–1

11 6635 min

–1

Table 3 ∆TWMAX

Notes:

1. See the data in Table 1 on page 47 for each constant in capital letters in the diagrams.

– 59 –

Compressor speed

Maximum speed = WBEMAX

Outdoor fan

See basic operation

Med

Set to 7 hours

0.5hr 6.5hr

Lo

Indoor fan

Sleep key

Operation lamp

[SLEEP] on the remote controller is lit

Timer lamp

Hi Med Lo Silent Sleep

Vertical air deflector

Facing up Horizontal

Shut

Notes: (1) The sleep operation starts when the sleep key is pressed. (2) When the sleep key is set, the maximum compressor speed is limited to WBEMAX, and the indoor fan

is set to “Sleep Silent” (FWSOY).

(3) If the operation mode is changed during sleep operation, the changed operation mode is set and sleep

control starts. (4) The indoor fan speed does not change even when the fan speed mode is changed. (Lo) (5) When defrosting is to be set during sleep operation, defrosting is engaged and sleep operation is restored

after defrosting. (6) When operation is stopped during sleep operation, the set temperature when stopped, as well as the time,

continue to be counted. (7) If the set time is changed during sleep operation, all data including set temperature, time, etc. is cleared

and restarted. (8) If sleep operation is cancelled by the cancel key or sleep key all data is cleared. (9) There is no preset temperature shift due to time elapse.

Heating Sleep Operation

NOTE

1. Refer to the PWRITE-ZU data for the constants expressed by capital alphabet letters

in the drawing.

1 min

WMIN

DFMAX

deeps rosserpmoC

TDF

411

TDF 412

TDF

413

TDF421

WMAX

TDF 431

STARCPL

4000min

-1

4000min

-1

TDF 422

Notes: (1) The defrosting inhibit period is set as shown in the diagram below. When defrosting has

finished once, the inhibit period is newly set, based on the outdoor temperature when the compressor was started. During this period, the defrost signal is not accepted.

(2) If the difference between the room and outdoor temperatures is large when defrosting is

finished, the maximum compressor speed (WMAX) or (WMAX2) can be continued for 120

minutes maximum. (3) The defrosting period is 20 minutes maximum. (4) When operation is stopped during defrosting, it is switched to auto refresh defrosting. (5) Auto refresh defrosting cannot be engaged within 15 minutes after operation is started or

defrosting is finished.

Reversing Valve Defrosting

Setting Defrosting Inhibit Period

D F T I M 3

D F T I M 2

e m

iT

Outdoor temperature

– 1 0 – 5˚C0˚C

D F T I M 1

Notes: (1) The first inhibit time after operation start is set to DFTIM1. (2) From the second time onwards, the inhibit time is set according to the time required for

defrosting.

Reverse cycle operation time ≥ [DEFCOL] : DEFTIM1 is set.

Reverse cycle operation time < [DEFCOL] : The time corresponding to outdoor tempera-

ture is set.

– 61 –

– 63 –

REFRIGERATING CYCLE DIAGRAM

MODEL RAS-

50FH5 / RAC-50YH5

COOLING, DEHUMIDIFYING, DEFROSTING

OUTDOOR UNIT

REVERSING VALV E

SUCTION TANK

SERVICE VALVE

(1/2)

INDOOR UNIT

SINGLE-ENDED UNION (1/2)

ROSSERPMOC

SERVICE VALVE

(1/4)

ELECTRIC EXPANSION VALVE

STRAINER

HEATING

OUTDOOR UNIT

REVERSING VALV E

SUCTION TANK

SERVICE VALVE

(1/2)

ROSSERP

MOC

SERVICE VALVE

(1/4)

ELECTRIC EX

PANSION VALVE

STRAINER

SINGLE-ENDED UNION (1/4)

INDOOR UNIT

SINGLE-ENDED UNION (1/2)

SINGLE-ENDED UNION (1/4)

– 64 –

NOITACIFICEPSGNITAREPOECNEREFER

ROTCE

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NAFLA

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FF O

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– 65 –

The reset circuit initializes the microcomputer program when power is ON or OFF. Low voltage at pin7resets the microcomputer and Hi activates the microcomputer. When power ÒONÓ 5V voltage rises and reaches 4.4V, pin 1 of IC521 is set to ÒHiÓ. At this time the

microcomputer starts operation. When power ÒOFFÓ voltage drops and reaches 4.2V, pin 1 of IC521 is set to ÒLowÓ. This will RESET the

microcomputer.

DESCRIPTION OF MAIN CIRCUIT OPERATION

MODEL RAS-50FH5

1. Reset Circuit

Fig. 1-1

Fig. 1-2

2

1

5

3

7

NORMAL : HI RESET : LO

RES

Microcomputer

425C

125R

225C

125C

R522

5V

0V

IC521

Voltage

5.0V

Reset enter at 4.2V

Reset release at 4.4V

voltage

5.0V

Voltage at pin

7

of microcomputer

Voltage supply to pin

2

of IC521

– 66 –

2. Receiver Circuit

The light receiver unit receives the infrared signal from the wireless remote control. The receiver amplifies and shapes the signal and outputs it.

3. Buzzer Circuit

Fig. 3-1 Buzzer Circuit

Sound wave

Metal diaphragm

V

Pizoelectric element

V

Fig. 3-2 Buzzer Operation

Microcomputer

Buzzer output

BZ1

12V

0V

R721

30

1

16

BZ

When the buzzer sounds, an approx.

3.9kHz square signal is output from buzzer

output pin of the microcomputer. After

the amplitude of this signal has been set

to 12Vp-p by a transistor, it is applied to

the buzzer. The piezoelectric element in

the buzzer oscillates to generate the

buzzers sound.

12V

R1

0V

13 RECEIVER I/P

Microcomputer

R211 R611

IRR

GND

V

out

V

DD

ZD141

116C

Fig. 2-1

30

8

212C

112C

R141

Q141

R212

L201

– 67 –

4. Auto Sweep Motor Circuit

● Fig. 4-1 shows the Auto sweep motor drive circuit; the signals shown in Fig.4-2 are output from pins

15 – 18 of microcomputer.

● As the microcomputer’s outputs change as shown in Fig.4-2, the core of the auto sweep motor is excited

to turn the rotor. Table 4-1 shows the rotation angle of horizontal air deflectors.

Table 4-1 Auto sweep Motor Rotation

Rotation angle per step (˚ ) Time per step (ms.)

0.0882 10Horizontal air deflectors

Microcomputer pins Step width

Horizontal air

deflectors: 10ms.

Horizontal air deflectors

15

16

17

18

12345678

Fig.4-2 Microcomputer Output Signals

10

11

8

9

12

0V

7 6 5

4

18 17

16

Microcomputer

IC711

C711

C712

C713

Rotor

Auto sweep motor for horizontal air defectors

15

12V

13

Fig.4-1

– 68 –

5. Room Temperature Thermistor Circuit

Fig. 5-1 shows the room temperature thermistor circuit.

5

4

3

2

1

0

010

Room temperature (

C)

Fig. 5-2

20 30 40

0V

Room temperature thermistor

0V

5V

Fig. 5-1

62

A

R305

C302

Microcomputer

Room temp. input

taegatloV

)V(

R301

0V

Heat exchanger temperature thermistor

0V

5V

Fig. 6-1

61

A

R306

C303

Microcomputer

Heat exchanger temperature input

R302

A

5

4

3

2

1

0

010

-10

Heat exchanger temperature (

C)

Fig. 6-2

20 30 40

taega

t

loV

)V(A

6. Heat exchanger temperature thermistor circuit

The voltage at depends on the room temperature as shown in Fig. 5-2.

The circuit detects the indoor heat exchanger temperature and controls the following.

(1) Preheating. (2) Low-temperature defrosting

during cooling and dehumidifying operation.

(3) Detection of the reversing valve non-operation or heat exchanger temperature thermistor open.

The voltage at depends on the heat exchanger temperature as shown in Fig. 6-2.

A

– 69 –

7. Initial Setting Circuit (IC401)

When power is supplied, the microcomputer reads the data in IC401 or IC402 (E2PROM) and sets the preheating activation value and the rating and maximum speed of the compressor, etc. to their initial values.

Data of self-diagnosis mode is stored in IC401 or IC402; data will not be erased even when power is turned off.

Fig. 7-1

Microcomputer

External ROM

SCL SDA

0V

5V

5V 5V

C401

IC401 (E

2

PROM)

404R

304R

27 26

1 2 3 4

8 7 6 5

}

– 70 –

Model RAC-50YH5

1. Power Circuit

This circuit full-wave rectifies 220-240V AC applied between terminals L and N, and boosts it to a required voltage with the active module, to create a DC voltage.

The voltage becomes 260-360V when the compressor is operated

(1) Active module

The active filter , consisting of a reactor and switching element, eliminates higher harmonic components contained in the current generated when the compressor is operated, and improves the power-factor.

(2) Diode stacks

These rectify the 220-240V AC from terminals L and N to a DC power supply.

< Reference >

In case of malfunction or defective connection: Immediately after the compressor starts, it may stop due to Òabnormally low speedÓ active error, etc.

The compressor may continue to operate normally, but the power-factor will decrease, the operation current will increase, and the overcurrent breaker of the household power board will probably activate.

In case of active module faulty or defective connection:

Although the compressor continues to operate normally, the power-factor will decrease, the operation current will increase, and the overcurrent breaker of the household power board will probably activate.

< Reference >

If diode stack 1 is faulty, the compressor may stop due to ÒlpÓ, Òanbormally low speedÓ, etc. immediately after it starts, or it may not operate at all because no DC voltage is generated between the positive and negative terminals.

If diode stack 1 is faulty, be aware that the 25A fuse might also have blown.

If diode stack 2 is faulty, DC voltage may not be generated and the compressor may not operate at all. Also, be aware that the 3A fuse might have blown.

L

25A FUSE

SURGE- ABSORBER

1RO T

S

IRAV

3R OTSIR

AV

CT1 C009

L001

10 0

C

400 C

500C

600 C

R007

L002

JW6

R008

ICP RELAY

TB2

TB8

TB7 TB6

TB10 TB11 TB12

U V W

N1

L1 L2

ESUFA3

R002

C008

C007

C012 C013

C014 C015

DIODE

STACK 2 (RC2)

DIODE

STACK 1

(D25VB60)

2ROTSIRAV

110C

TIUCRI

C REWOP

010R110R

2

0

0 C

3

0

0C

100R

0V

NF COIL1

COIL

POWER RELAY

TERMINAL

BOARD

N

REACTOR

010C

SPM2

P1

Vdba

Fig. 1-1

– 71 –

(3) Smoothing capacitor (C501, C502, C503)

This smoothes (averages) the voltage rectified by the diode stacks.

(4) Smoothing capacitor (C010, C011)

This smoothes (averages) the voltage rectified by the diode stack2. A DC voltage is generated in the same way as in Fig. 1-3. Voltage between + side of C010 and Ð side of C011 is about 330V.

(5) C001 to C003, C012 to C015, C007, C008, NF COIL1, COIL,

absorb electrical noise generated during operation of compressor, and also absorb external noise entering from power line to protect electronic parts.

(6) Surge absorber, Varistor 1, 2, 3,

absorbs external power surge.

(7) Inrush protective resistor (R007, R008)

This works to protect from overcurrent when power is turned on.

< Reference >

When inrush protective resistor is defective, diode stack may malfunction. As a result, DC voltage is not generated and no operation can be done.

Be careful to avoid an electric shock as a high voltage is generated. Also take care not to cause a short-circuit through incorrect connection of test equipment terminals. The circuit board could be damaged.

Fig. 1-3

Fig. 1-2

a

b

OV

Vd

DC voltage (approx. 260-360V during operation)

Smoothing Capacitors

SPM2

– 72 –

2. Indoor/Outdoor Interface Circuit

The interface circuit superimposes an interface signal on the DC 35V line supplied from the outdoor unit to perform communications between indoor and outdoor units. This circuit consists of a transmiting circuit which superimposes an interface signal transmit from the microcomputer on the DC 35V line and a transmiting circuit which detects the interface signal on the DC 35V line and outputs it to the microcomputer.

Communications are performed by mutually transmiting and receiving the 4-frame outdoor request signal one frame of which consists of a leader of approx. 100 ms., start bit, 8-bit data and stop bit and the command signal with the same format transmit from the indoor unit.

Communication signal from outdoor microcomputer to indoor microcomputer. At first outdoor microcomputer will send a request signal (SDO) to indoor microcomputer. A high-frequency IF signal approx. 38 KHz is generated and modulated by the request signal (SDO) inside the outdoor microcomputer then output to pin

11

of microcomputer. This modulated IF signal is output to pin30of HIC and amplified by amp. This signal is superimposed to DC 35V line via C801 and L801. To prevent erroneous reception, the outdoor microcomputer is designed so that it cannot receive a signal while it is outputting a request signal. The receiving circuit in the indoor unit consists of a comparator and transistor. The interface signal from the outdoor unit on the DC 35V line is supplied to C821, where DC components are eliminated, and is then shaped by the comparator. The shaped signal is detected by diode, amplified by amp, and output to pin

49

of the indoor microcomputer. Fig. 2-2 shows the voltages at each component when data is transferred from the outdoor microcomputer to the indoor microcomputer.

Communication signal from indoor microcomputer to outdoor microcomputer. The request signal (SDO) generates by indoor microcomputer is output to pin

50

, and amplifies by C801. IF signal approx. 38 kHz

is generated by comparator, then modulate by the request signal from pin

50

of indoor microprocessor. This modulated IF signal is then amplified and superimposed to DC 35V line via L801 and C802 of indoor interface circuit. Fig. 2-3 shows the voltages at each component when data is transferred from outdoor microcomputer to indoor microcomputer. The circuit operation of the outdoor receiving circuit is same as indoor receiving circuit.

– 73 –

Fig. 2-1 shows the interface circuit used for the indoor and outdoor microcomputers to communicate with

each other.

Indoor P.W.B.

Outdoor P.W.B.

Terminal board

CD

D101

I/F 0V

C821 R821

C822

0V

0V 0V0V

5V 5V 5V

0V

5V

0V

C801

R829

R830

Q821

C824

0V

IC801

C823

828R

328R

528R

D821

R827

R826

0V

I/F 0V

0V

IF transmit output (SDO)

IF receive input (SDI)

MICROCOMPUTER

5V

0V

5V

12V

5V 5V

5V

5V5V

5V

C802

R813

L801

R812

Q803

C803

C804

R811

Q802

Q801

R824

3 2

1

R822

R806

708R

R805

R803

R804

5

7

6

IC801

R810

50

49

IF transmit output (SDO)

HIC

IF receive input (SDI)

MICROCOMPUTER

11

30

68

29

0V

L801

L802

C801

C809

R802 Q801

5V

0V

R801

30 8R

0V

0V0V

C808

NF COIL2

C810

C802

C806

C807

C812

C811

Interface relay

35V

(Communications from outdoor microcomputer to indoor microcomputer)

(Communications from indoor microcomputer to outdoor microcomputer)

Fig. 2-1 Indoor/outdoor interface Circuit

– 74 –

Outdoor HIC

29

30

Indoor microcomputer

DC 35V line

49

50

100ms. Leader

33ms. 1 frame

0.7V 0V

5V 0V

35V

Indoor microcomputer

4.95ms. Transmit / receive switching time

33ms. 1 frame

Outdoor HIC

30

0V

29

5V 0V

50

5V 0V

49

5V 0V

DC 35V line

35V

Fig. 2-2 Voltages Waveforms of indoor / Outdoor Microcomputers (Outdoor to Indoor Communications)

Fig. 2-3 Voltages Waveforms of indoor / Outdoor Microcomputers (Indoor to Outdoor Communications)

– 75 –

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Reversing valve 2-way valve Fan (2 MSB) Fan (1 Fan (0 LSB) Capacity code (3 MSB) Capacity code (2) Capacity code (1) Capacity code (0 LSB) Indoor in-operation bit Operation mode (2 MSB)

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Compressor command speed (5)

Compressor command speed (6)

Compressor command speed (7 MSB)

15/20(A)

Compressor minimum rotation speed (4 MSB) Compressor minimum rotation speed (3) Compressor minimum rotation speed (2) Compressor minimum rotation speed (1) Compressor minimum rotation speed (0 LSB)

7

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Actual compressor rotation speed (5 MSB) Actual compressor rotation speed (4) Actual compressor rotation speed (3) Actual compressor rotation speed (2) Actual compressor rotation speed (1) Actual compressor rotation speed (0 LSB) Compressor during operation Compressor during operation Outside temperature (7 MSB) Outside temperature (6) Outside temperature (5) Outside temperature (4) Outside temperature (3) Outside temperature (2) Outside temperature (1 Outside temperature (0 LSB) Self-diagnosis (3 MSB) Self-diagnosis (2) Self-diagnosis (1) Self-diagnosis (0 LSB) Defrost request signal During forced operation

Multi-bit

stnetnoC

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– 77 –

3. Power Module Circuit

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– 78 –

DC 260-360V is input to system power module and system power module switches power supply current according to rotation position of magnet rotor. The switching order is as shown in Fig. 3-2.

E

F

UVVW

Upper arm transistor

Lower arm transistor

Time

++T+

+

T

U

Ð

V

Ð

W

Ð

U transistor chopped

U transistor ON

ON

Voltage at

Upper arm transistor

Current at

Chopping period

260V-360V

A

+

-

B

At point E: U+is ON, VÐis ON (circuit in Fig. 3-1) At point F: U+is chopped (OFF), VÐis ON (circuit in Fig. 3-4)

[]

Upper arm transistor is controlled to ON/OFF by 3.3kHz chopper signal. Rotation speed of the compress is proportional to duty ratio (ON time/ ON time + OFF time) of this chopper signal.

Time T in Fig. 3-2 shows the switching period, and relation with rotation speed (N) of the compressor is shown by formula below;

Fig. 3-2 Switching order of power module

N = 60/2 X 1/T

Fig. 3-3 shows voltage waveform at each point shown in Figs. 3-1 and 3-4. First half of upper arm is chopper, second half is ON, and first half of lower arm is chopper, second half is ON.

Fig. 3-3 Voltage waveform at each point

When power is supplied U

+

UÐ, because of that U+is chopped, current flows as shown below;

(1) When U+transistor is ON: U+transistor U coil V coil VÐtransistor DC current detection

resistor Point (Fig. 3-1)

(2) When U+transistor is OFF: (by inductance of motor coil) U coil V coil VÐtransistor Return

diode Point (Fig. 3-4)

A

B

– 79 –

+

U

V

W



U

+

V



V

+

W



W

_

+

System Power Module 2

260V-360V

R24

DC current (Id) detection resistor

A

U coil

DC compressor motor

V coil

W coil

B

Fig. 3-5

Since current flows at point only when U+ transistor is ON, the current waveform at point becomes intermittent waveform as shown in Fig. 3-3. Since current at point is approximately proportional to the input current of the air conditioner, input current is controlled by using DC current (Id) detection resistor.

If power module is detective, self diagnosis lamps on the control P.W.B. may indicate as shown below:

Simplified check of power module (Lighting mode when operated with compressor leads disconnected) (1) Disconnect connector of 3-pole (WHT, YEL, RED) lead wire connecting to compressor located at the

lower part of electric parts box.

(2) Set to compressor operation state (other than FAN mode) and press Start/stop switch of remote

control.

(3) If normal operation continues for more than 1 minute (LD303 lights), power module is considered

normal. Refer to other item (troubleshooting on page 94) for independent checking of power module.

Fig. 3-4 Power module circuit (U+is ON, VÐis ON)

Self-diagnosis

Self-diagnosis lamp and mode

lp (peak current cut)

LD301

Abnormal low speed

rotation

LD301

Switching incomplete

LD301

Blinks 2 times

Blinks 3 times

Blinks 4 times

Table 3-1

B B

B

Self diagnosis lamps (LD303, 302, 301)

P.W.B (Main)

– 80 –

4. Power Circuit for P.W.B.

Fig. 4-1 shows the power circuit for P.W.B. and waveform at each point.

22

18

19

+

D908

R917

R915

D909

R918

L903

REG1

C911

20

21

+

D907

C910

R914

C912

16

17

+

309C

709C

+

419C

14

13

R916

L902

35V

17V

5V

FM15V

I/F0V

0V

FM0V

C913

D910

2 G ER

Q706

C924

R920

129R

R922

PQ2

1

2

4

3

4

3

1

2

3

1QP

1RV

329R

C906

C918

R911

D906

C908

PQ1

12

C

11

409D

809R

909R

D903

D905

D911

R910

R901

C901

R902

309R

R002

Diode stack 2

(RC2)

409R

2 5

3 4

1

+

IC901

110C

010C

110R

010R

509C

209D

609R

L901

R907

Switching transformer (T1)

Fig. 4-1 Power circuit for P.W.B.

1

9

+

919C

+

129C

0 29C

12V

D912

9 1 9R

529R

409DZ429R

C909

15

1 2

8WJ

8 W

J

4 3

In the power circuit for P.W.B., power supply for microcomputer, peripheral circuits, and system power module driver circuit and, as well as DC 35V, are produced by switching power circuit.

Switching power circuit performs voltage conversion effectively by switching transistor IC901 to convert DC 330V voltage to high frequency of about 20kHz to 200kHz.

Transistor IC901 operates as follows:

(1) Shifting from OFF to ON

DC about 330V is applied from smoothing capacitors C010 and C011 in the control power circuit. With this power, current flows to pin of IC901 via R903 and R904 and IC901 starts to tum ON. Since voltage in the direction of arrow generates at point at the same time, current passing through R910 and D903 is positive-fed back to IC901.

4

C

+



– 81 –

(2) During ON

● The drain current at IC901 increases linearly. During this period, the gate voltage and current become

constant because of the saturation characteristics of the transformer.

(3) Shifting from ON to OFF

● This circuit applies a negative feedback signal from the 12V output. When the voltage across C919

reaches the specified value, REG2 turns on and current flows to PQ2 1-2. This turns the secondary circuits on, sets IC901 pin 1 to “Hi”, and turns IC901 off.

(4) During OFF

● While IC901 is on, the following energy charges the primary windings of the transformer:

Energy=LI

2

/2. Here, L : Primary inductance

I : Current when IC1 is off

This energy discharges to the secondary windings during power off. That is, C910, C911, C912, C914 is charged according to the turn ratio of each winding.

● At the start, an overcurrent flows to IC901 because of the charged current at C910, C911, C912, C914.

● The drain current at IC901 generates a voltage across R906. If it exceeds the IC901 base voltage, it sets

the IC901 gate voltage to “HI”.

● R906 limits the gate voltage to prevent excessive collector current from flowing to IC901.

If the power circuit for P.W.B. seems to be faulty:

(1) Make sure that 5V and 12V on the control P.W.B., upper arm U, V and W, and the lower arm power

voltage are the specified values.

(2) When only the 5V output is low:

REG 1 (regulator) faulty, 5V-0V shorted, output is too high, or REG 1 is abnormal.

(3) When 12V and 5V are abnormal:

The following defects can be considered:

1 Fan, operation, power, rush prevention relay (shorting in relay, etc.) 2 Microcomputer is abnormal. 3 REG 1 (regulator is abnormal), etc.

Shorting on primary circuits. When shorting occurs in the secondary circuits, there is no abnormality in the primary circuits because of overcurrent protection. The voltage rises when an opening occurs in the primary circuits, or the feedback system is abnormal.

(4) When 15V and 17V are abnormal:

D908, D909 or drive circuit is abnormal.

(5) When all voltage are abnormal:

IC901, R906, etc. are possibly abnormal.

* If IC901 is abnormal, be aware that other components, such as the power module, REG (regulator), etc.

are possibly defective.

[When the switching power supply seems to be abnormal, the voltage between IC901 pin 4 (to be measured at the leads of R904 and R903) and IC901 pin 5 (to be measured at R906 lead) may be between 11 and 16V. This is because the protection circuit of IC901 is operating.]

– 82 –

5. Reversing valve control circuit

Reversing valve control circuit can switch reversing valve ON/OFF according to instruction from indoor microcomputer depending on the operation condition shows in Table 5-1.

Voltage at each point in each operation condition is approximately as shown below when measured by tester. (When collector voltage of Q701 is measured)

3

1

16

24

I/F 0V

0V

Fig. 5 Ð 1

D702

CN2

Q701

DC voltmeter or tester

Reversing valve

R701

R703

R219

Q705

FUSE RESISTOR

RETUPMOCORCIM

PQ701

1

23

4

5V

HIC

I/F 35V

R702

V

Operation condition Collector voltage of Q701

Cooling

Heating

Dehumidifying

General operation of Cooling

In normal heating operation

MAX. rotation speed instructed by indoor microcomputer after defrost is completed

Defrosting

Sensor dry

About 35V

About 0.8V

About 35V

Table 5-1

– 83 –

6. Rotor magnetic pole position detection circuit

A

B

C

D

E

18 19

20

retupmocorcimroodtuO

C605

+5V

0V

HIC

0V

+12V

WV U

C608

System power module

DC brushless motor for compressor

R604

R605

R606

R607

106R

206R

306R

406R

306R

206R

806R

305C

205C

105C

116R

016R

90 6R

0V

C606

0V

C607

0V

36

33

34

35

47

Fig. 6-1 Rotor magnetic pole position detection circuit and voltage waveform at each point

E

D

C

A

No power supplied

Upper armONNo power

supplied

No power supplied

Lower arm

ON

60 120 60 120

Induced voltage

Comparing process

60

Vd 150~ 330

Spike voltage

U phase terminal voltage

Drive signal

Pole position detection signal

(B) reference

voltage (1/2Vd)

Detection point

W

+

W

+

U

+

U

+

U

Ð

V

Ð

V

Ð

W

Ð

V

+

To detect U phase, voltage at pointCis produced by driving motor induced voltage signal (voltage at pointA) and 1/2 voltage of Vd (voltage at point

B

), and comparing with comparator.

For V phase and W phase, voltage at point

D

and voltage at pointEare produced in the same way as above. Voltage

at point

C

is taken into indoor unit microcomputer, switching timing to U+transistor from W+transistor is produced by

delaying 30

from rise waveform, ignoring spike voltage. In addition, switching timing to U-transistor from W-transistor is

produced by delaying 30

from fall waveform.

For V phase and W phase, in the same way as above, drive signals are produced from voltages at pointDand point

E

. Phases are shifted by 120°and 240 , respectively, comparing with U phase.

– 84 –

7. Drive Circuit

Fig. 7-1 shows the drive circuit. The circuits for U phase, V phase and W phase have the same Configuration.

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WG N

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BU S

BVS

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BC

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205R

305R

405R

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6

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60 5

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6

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5

3

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5

2

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405Q

435R

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4

2

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335R

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105Q

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V

W

– 85 –

U

+

V

+

5V 0V

W

+

V

-

W

-

U

-

U

+

V

+

15V

0V

W

+

V

-

W

-

U

-

tnioptalangisevirD

B

tnioptalangisevirD

A

V

+

U

+

W

+

V

+

U

+

V

-

W

-

U

-

V

-

W

-

[Low speed rotation mode]

[High speed rotation mode]

V

+

U

+

W

+

V

+

U

+

U

+

V

+

5V 0V

W

+

V

-

V

-

W

-

U

-

U

+

V

+

15V

0V

W

+

V

-

W

-

U

-

W

-

U

-

V

-

W

-

t n

i o pta

l an

g

i s

ev irD

B

tniopt

a l a n g

is e

v

ir D

A

Fig. 7-2

Fig. 7-3

– 86 –

8. HIC and Peripheral Circuits

●

Fig. 8-1 shows the micro computer and its peripheral circuits, Table 8-1, the basic operations of each circuit block, and Fig. 8-2, the system configuration.

Table 8-1

Circuit block

Basic operation

Peak current cutoff circuit

Set value circuit

Voltage amplifier circuit

Reset circuit

Trip signal synthesis circuit

Detects DC current flowing power module and during overcurrent (instantaneous value) flows, stops upper/lower arm drive circuits and also produces lp signal by which drive signal output is stopped.

Compares voltage detected, amplified and input to HIC with set voltage value in microcomputer, and controls overload when set value exceeds input voltage.

Voltage-amplifies DC current level detected by the detection resistor and inputs this to microcomputer. Internal or external overload is judged in microcomputer.

Produces reset voltage.

Modulates chopper signal to drive signal and stops according to presence/ab- sence of lp signal or reset signal.

59

17

61

48

58

62

+

60

Is

D104

L

CT1

N

R005

0V0V

0V

R221

C218

12V

292R

742R

7

01C

0V

600R

501C

+

712C

900C

JW10

R252

R222

R248

IC4

C205

R288

IC5

+



2

3

1

+



6

5

7

Fig. 8-1 Microcomputer and Peripheral Circuits

RESET

Is

Id

Ip

Vd

CN13CN14

R41

R24

N1

IC1

SPM2  HIC

DC260-380V

P2

SPM2

MAIN P.W.B

Direct Current

DC Current

Detection Resistor

OC

F

0V0V

HIC

IC1

622C

0V

5

82R

682R

502D

402D

9

42R

4

82R

0V

522C

422C

0V

222C

0V

4

02C

0V

5

12C982R

0V

5V

3

5

2 R

005R

24R

34R

43C

37

521

19

20

8

99

10

3938

MICROCOMPUTER

0V

R245

– 87 –

Drive

signal

Chopper

signal

Chopper

signal

DC Current level

DC current

Detection

resistor

5V

DC 260V

-360V

Reset circuit

Over-load external

setting circuit

Current amplified

circuit

Drive

Circuit

IP signal

Reset Voltage

Peak current cut off circuit

retupmocorcimroodtuO

langispirT

ti ucr

icsis

e ht

nys

Compressor

motor

Power module

Fig. 8-2

●

The following describes the operations of each circuit in detail.

(1) Peak current cut off circuit Fig.8-3 Peak Current Cut off Circuit and Waveforms at Each Section.

DC current Id

Voltage at point

1.35V

27A

Voltage at point

A

B

A



Fig.8-3

Detection

resistor

Negative Terminal

DC current

0V

34 R

0V

R41

QC

R42

SPM2

SPM2  HIC

Main P.W.B

HIC

IC1

CN14

IP Outdoor microcomputer

F

34R

9 9

8

20 9 2 39 17

B

●

The Ip cut off circuit detects an instantaneous excessive current and stops inverter to protect parts such

as SPM2, etc.

●

As shown in diagram, if current exceeding 27A flows, voltage at point recognized

by detecting resistor is input to pin of SPM2  HIC, and voltage divided by R41 and R43 is input to pin

of IC1. Since threshold of IC1 is exceeded in this case, Lo signal is input from pin (Voltage at point

. When Lo signal is input to pin of microcomputer, microcomputer stops drive output.

●

When drive output from microcomputer is stopped, all drive output goes Hi, and microcomputer is initialized to enter drive signal standby mode. 3 minutes later, microcomputer outputs drive signal again, to start operation.

10

8

9

B

A

17

– 88 –

(2) Overload control circuit (OVL control circuit)

●

Overload control is to decrease the speed of the compressor and reduce the load when the load on the air conditioner increases to an overload state, in order to protect the compressor, electronic components and power breaker.

●

Overloads are judged by comparing the DC current level and set value.

●

Fig. 8-4 shows the overload control system configuration and Fig. 8-5 is a characteristic diagram of overload judgement values. There are two judgement methods-external judgement which compares the externally set value with the DC current value regardless of the rotation speed and internal judgement which compares the set value that varies according to the rotation speed programmed in the microcomputer software with the DC current value.

To power module negative terminal

(R24)

tnerrucCD

Voltage amp

circuit

(Internal judgement)

DC voltage

Judgement value according to the rotation speed

(internal judgement value)

OVL judgement with respect to externally set value

A/D

converter

A/D

converter

Judgement OVL according to the rotation speed

Selects data according to the rotation speed and DC voltage

OVL start current data

a

taddee

psno

i

tato

R

Motor control process

Microcomputer

Detection

resistor

Fig. 8-4 Overload Control System Configuration

Fig. 8-5

tnerr

ucC

D

Rotation speed

. Overload external judgement circuit

●

Fig. 8-1. The filter consisting of R245 and C217 removes high harmonic components from the voltage generated by the current flowing to Detection resistor; R245 and C217 average the voltage. This voltage is then input to IC4 pin is then amplified and supplied to microcomputer pin . The microcomputer compares this input with the internally set value, and if the input exceeds the set value, it enters overload control status.

●

Fig. 8-7 shows the rotation speed control. When the voltage at pin of the microcomputer exceeds the set value, the microcomputer decreases the rotation speed of the compressor and reduces the load regardless of the rotation speed commanded by the indoor microcomputer.

5

60

1

– 89 –

60

Fig. 8-6

Fig. 8-7

Voltage at microcomputer pin

Rotation speed of compressor

Deceleration DecelerationAcceleration Acceleration

Commanded rotation speed

Actual rotation speed

59

61

58

+

60

Is

D104

L

CT1

N

R005

0V0V

0V

0V0V

7

42R

600R

501C

+

712C

900C

R222

C218

R221

R248IC4

+



6

5

7

Is

Id

Vd

CN13

CN14

R24

N1

DC 260-380V

SPM2

MAIN P.W.B.

P2

Direct Current

DC Current

Detection Resistor

HIC

IC1

Microcomputer

5

02 D

4

02 D

422C

0V

222C

0V0V

5V

35 2

R

942R

005R

+

C205

0V

5

1

373938

R245

10

1

. Voltage amp. circuit

●

The voltage amp. circuit amplifies the DC current level detected by the detection resistor after being converted to a voltage and supplies it to the microcomputer. Receiving this, the microcomputer converts it to a digital signal and compares it with the internal data to judge whether or not overload control is required.

< During overload control >

●

The filter consisting of R245 and C217 removes high harmonic components from the voltage generated from the DC current flowing to the detection resistor, and supplies it to IC4 pin IC4 forms a non-inverting voltage amp. circuit together with the peripheral elements.

●

The microcomputer stores the set values which vary according to the rotation speed. When the DC current level exceeds the set value, the microcomputer enters the overload control state.

●

The set Value is determined by the amplification of the voltage amp. circuit.

●

Amplification : high

[

DC current : low

●

Amplification : low

[

DC current: high

2

5

– 90 –

●

R500, R253, detect the DC voltage at the power circuit. The microcomputer receives a DC voltage (260- 380V) via HIC

3

7

and applies correction to the overload set value so the DC current is low (high) when

the DC voltage is high (low). (Since the load level is indicated by the DC voltage multiplied by DC current, R247, R248, R249 are

provided to perform the same overload judgement even when the voltage varies.)

< During start current control >

●

It is required to maintain the start current (DC current) constant to smooth the start of the DC motor for the compressor.

●

RAC-50YHA uses software to control the start current.

●

The start current varies when the supply voltage varies. This control method copes with variations in the voltages as follows.

(1) Turns on the power module's U+and VÐtransistors so the current flows to the motor windings as shown in Fig 8-9.

(2) Varies the turn-ON time of the W+transistor according to the DC voltage level and the start is controlled so the start current is approx. 10A as shown in Fig. 8-10.

Fig. 8-8

tnerrucCD

G

0

Rotation speed

Amplification : low DC voltage : low DC current : high

Amplification : high DC voltage : high DC current : low

Amplification : 8.5 times DC voltage : 260V

U

+

U

Ð

V

+

V

Ð

W

+

W

Ð

U

V

W

Compressor motor

DC current

Power module

DC 260-360V

Detection

resistor

Fig. 8-9

Fig. 8-10

20 15 10

5 0

)A( t

n e

r

r uc

C D

r otsisn

a

rtW

e m

i

t

- NO

Start

DC voltage (start current)

Set value

Time

Chopper duty: high

DC voltage: low DC voltage: 280V DC voltage: high

– 91 –

9. Temperature Detection Circuit

●

The Over heat thermistor circuit detects the temperature at the surface of the compressor head, the Defrost. thermistor circuit detects the defrosting operation temperature.

●

A thermistor is a negative resistor element which has the characteristics that the higher (lower) the temperature, the lower (higher) the resistance.

●

When the compressor is heated, the resistance of the Over heat thermistor becomes low and voltage at pin62of microcomputer is increased.

●

Microcomputer compares the voltage present at pin

62

with the internal set value, if it is exceeded the

set value microcomputer judges that the compressor is overheated and stops operation.

●

When frost forms on the outdoor heat exchanger, the temperature at the exchanger drops abruptly. Therefore the resistance of the Defrost. thermistor becomes high and the voltage at pin63of microcomputer drops. If this voltage becomes lower than the set value stored inside, the microcomputer starts defrosting control.

●

During defrosting operation the microcomputer transfers the defrosting condition command to the indoor microcomputer via the circuit interface.

●

The microcomputer always reads the outdoor temperature via a thermistor (microcomputer pin64), and transfers it to the indoor unit, thus controlling the compressor rotation speed according to the value set at the EEPROM in the indoor unit, and switching the operation status (outdoor fan on/off, etc.) in the dry mode.

The following shows the typical values of outdoor temperature in relation to the voltage:

When the thermistor is open, in open status, or is disconnected, microcomputer pins

62Ð64

are approx. 0V;

when the thermistor is shorted, they are approx. 5 V, and LD301 blinks seven times. However, an error is detected only when the OH thermistor is shorted; in such a case, the blinking mode is

entered 12 minutes after the compressor starts operation.

Table 9-1

Outdoor temperature ( C)

Microcomputer pin

5

voltage (V)

-10

1.1901.69102.23

20

3.22403.62

627

0V

+5V

O.H. thermistor

O.H.

Normal 2.7V or less Over heat 2.7V or more Reset 2.3V or less

CN8

636

0V

+5V

DEF. thermistor

DEF.

Normal 2.4V or more Over heat 2.4V or less Reset 2.9V or more

CN9

645

0V

+5V

Outdoor temperature thermistor

Outdoor temperature

Refer to the table 10-1

CN10

Microcomputer

HIC

Fig. 9-1

2.75

30

– 92 –

10. Reset Circuit

●

The reset circuit initializes the microcomputer program when Power is ÒONÓ or ÒOFFÓ.

●

Low voltage at pin48resets the microcomputer, and HI activates the microcomputer.

●

Fig. 10-1 shows the reset circuit and Fig. 10-2 shows waveform at each point when power is turned on and off.

●

When power is turned on, 12V line and 5V line voltages rise and 12V line voltage reaches 10.9V and reset voltage input to pin

48

of microcomputer is set to Hi.

●

Reset voltage will be hold ÒHiÓ until the 12V line voltage drops to 9.90V even though the power shuts down.

Microcomputer

R252

R289

0V0V

R288

0V

5V

12V

HIC

R284

JW10

IC5 (1/2)

402C

48

RESET

Main

P. W. B

Fig. 10-1

512C

682R

522C

701C

622C

582R

0V

1

3

2

62

8

Ð +

+

0V

292R

12V line

5V line

Fig. 10-2

Reset voltage

12

6

0

NO sir

ew oP

)V( e

ga t

l o V

12

6

0

F F

Osir

ew oP

) V(

eg atl oV

Time

– 93 –

R297

R298

C208

R108

R107

C101

VSD

RC Filter

Motor coil

System power module

Power supply for DC fan motor from smoothing capacitor in system power module

roticapaCgnihtoomS

U V W

BOARD

DC Fan motor with control board

CIREVIRDPIHCENO

R242

HIC

0V

R283

R246

Q201

5V

PQ102

5V

t

33.3KHz

Ap 7V

T/2

14

23

T

0V

Vcc

PWM control voltage

FG Pulse

CN6

FM-0V

FM-15V

D101

Q101

R101

R102

Main P.W.B

CN12

FM-15V

FM-0V

12V

0V

IC4

R244

Microcomputer

342R

501D

401R

501R

301R

601R

401 C

912C

411R

9 0 2 C

FM60 el FG Pulse input

Fig. 11-1

1

3

60

61

59

2

8

15

75

65

 +

+

601C

301C

101DZ

+

511R

7

6

5

4

3

2

1

321

123 4 5321

+++

2A-FUSE

11. Outdoor DC Fan Motor control circuit.

●

This model uses DC Fan Motor which has a controller circuit in the Motor.

●

This DC Fan Motor will rotate by control voltage apply to Vsp input. (Voltage range: 1.7 to 7V DC) Vsp high : Faster ; Vsp low : slower ; Vsp lower than 1.7V : stop

●

Motor will output FG pulse by following this motor revolution.

●

Outdoor Microprocessor will output PWM control signal from FMCHOP terminal by following the instruction from indoor Microprocessor.

●

This PWM control signal will convert to Vsp voltage by smoothing circuit (Q101 & RC filter)

●

Fan motor will start to rotate when Vsp was proceeding over than 1.7V, and generate FG pulse by rotation speed.

●

FG pulse will feed back to Outdoor Microprocessor through PQ102.

●

PQ102 is the isolator between Microprocessor circuit and DC Fan Motor circuit, which has to match the Fan Motor revolution with instructed revolution. Such as...

FG feedback: Faster Ð Instruction: Slower ... Decrease pulse width FG feedback: Slower Ð Instruction: Faster ... Increase pulse width

●

FG pulse is also used for Fan Motor failure detection

●

Microprocessor will monitor FG pulse 30 seconds after start the fan motor. If there is no signal detected, it will consider that the Fan Motor was malfunction and stop the operation. In this case, LD302 on control PWB will blink 12 times. (Fan Motor lock detected)

●

R107 and IC4 are used for Fan Motor over current

– 94 –

< Reference >

●

When operation stop with LD301 blinks 12 times, it may be caused by faulty DC fan motor.

●

In this case, please check CN6 and CN12 connection first. It makes Fan Motor Lock also if those connectors are in misconnection.

●

DC Fan Motor has broken when 2A Fuse was burned. Please replace both DC Fan Motor and 2A Fuse together.

●

It will makes ÒFan Lock StopÓ when something has disturb the Fan rotation by inserting materials into propeller fan or ice has growing inside of outdoor unit by snowing.

●

It may make ÒFan Lock StopÓ by strong wind (ex. 17m/sec or above) against the Fan rotation. In this case, unit will be restart again after a while.

●

In case of ÒFan Lock StopÓ even though the DC Fan Motor is rotating correctly, the possible casue is Fan Motor problem or PQ102 on board or control board problem. Stop after the Fan motor runs 2 minutes, Fan Motor may be broken.

< Caution >

●

Please take care for the electrical shock by high voltage of DC Fan Motor power source which is common with compressor when you are servicing this unit.

●

You can not confirm the coil and wiring of Motor due to the built in control circuit in Fan Motor.

– 95 –

Power factor is controlled to almost 100%. (Effective use of power) With IC in ACT module, control is performed so that input current waveform will be similar to waveform of input

voltage

12. Power Factor Control Circuit

* Assuming the same current capacity (20A), power can be used about 10% effective, comparing with curent use (power factor of 90%), and maximum capacity is thereby improved.

I (input current)

V (input voltage)

Invalid power area

(Even if voltage is applied. current does not flow)

Effective

voltage

area

input voltage

input current

Effective

voltage area

– 96 –

SERVICE CALL Q & A

Model RAS-50FH5 / RAC-50YH5

COOLING MODE

The compressor has stopped suddenly during cooling operation.

Sound of running water is heard from indoor unit during dehumidifying.

Compressor occasionally does not operate during dehumidifying.

The circulation stops occasionally during Heating mode.

When the fan speed is set at HIGH or MED, the flow is actually Weak.

Heating operation stops while the temperature is preset at "30".

Check if the indoor heat exchanger is frosted. Wait for 3-4 minutes until it is defrosted.

If the air conditioner operates in cooling mode when it is cold, the evaporator may get frosted.

Normal sound when refrigerant flows in pipe.

Compressor may not operate when room

when the humidity is preset humidity or less.

It occurs during defrost- ing. Wait for 5-10 minutes until the condenser is defrosted.

At the beginning of heating, the fan speed remains LOW for 30 seconds. If HIGH is selected, it switches to LOW and again to MED after additional 30 seconds.

If temperature is high in the outdoor, heating operation may stop to protect internal devices.

DEHUMIDIFYING MODE

HEATING MODE

Q1

A1

Q2

A2

Q3

A3

Q4

A4

Q5

A5

Q6

A6

– 97 –

AUTO FRESH DEFROSTING

AUTO OPERATION

NICE TEMPERATURE RESERVATION

INFRARED REMOTE CONTROL

After the ON/OFF button is pressed to stop heating, the outdoor unit is still working with the OPERATION lamp lighting.

Fan speed does not change when fan speed selector is changed during auto operation.

When on-timer has been programmed, operation starts before the preset time has been reached.

Does ÒNice temperature reservationÓ function operate during dehumidifying?

Even if the same time is preset, the operation start time varies.

Timer cannot be set.

The current time display disappears soon.

The timer has been programmed, but the preset time disappears.

Auto Fresh Defrosting is carried out : the system checks the outdoor heat exchanger and defrosts it as necessary before stopping operation.

At this point fan speed is automatic.

This is because ÒNice temperature reservationÓ function is operating. This function starts operation earlier so the preset temperature is reached at the preset time. Operation may start maximum 60 minutes before the preset time.

It does not work. It works only during cooling and heating.

This is because ÒNice temperature reservationÓ function is operating. The start time varies according to the load of room. Since load varies greatly during heating, the operation start time is corrected, so it will vary each day.

Has the clock been set? Timer cannot be set unless the clock has been set.

The current time disappears in approx. 10 seconds. The time set display has priority.

Is the current time past the preset time? When the preset time reaches the current time, it disappears.

When the current time is set the display flashes for approx 3 minutes.

Q7

A7

Q8

A8

Q9

A9

Q10

A10

A11

Q12

A12

Q13

A1 3

Q14

A14

Q1 1

– 98 –

OTHERS

Q15

A1 5

Q16

A1 6

Q17

A1 7

Q18

A1 8

Q19

A1 9

The indoor fan varies among high air flow, low air flow and breeze in the auto fan speed mode. (Heating operation)

This is because the cool wind prevention function is operating, and does not indicate a fault.

The heat exchanger temperature is sensed in the auto speed mode. When the temperature is low, the fan speed varies among high air flow, low air flow and breeze.

Loud noise from the outdoor unit is heard when operation is started.

When operation is started, the compressor rotation speed goes to maximum to increase the heating or cooling capability, so noise becomes slightly louder. This does not indicate a fault.

Noise from the outdoor unit occasionally changes.

The compressor rotation speed changes according to the difference between the thermostat set temperature and room temperature. This does not indicate a fault.

There is a difference between the set temperature and room temperature.

There may be a difference between the set temperature and room temperature because of construction of room, air current, etc. Set the temperature at a comfortable for the space.

Air does not flow immediately after operation is started.

Preliminary operation is performed for one minute when the power switch on and heating or dehumidifying is set. The operation lamp blinks during this time for heating. This does not indicate a fault.

– 99 –

TROUBLE SHOOTING

Model RAS-50FH5 / RAC-50YH5

PRECAUTIONS FOR CHECKING

Power source

+

~

+

Ð

~

el u

d o

MT C

A

+Ð+

Ð

N

C

D

L

Compressor motor

System power module 2

Indoor unit electric parts

Control P. W. B .

DC35V

0V

(0V)

MAIN P.W.B.

e

ludomre

w o P

a

b

M

1. Remember that the 0V line is biased to 155-170V in reference to the ground level.

2. Also note that it takes about 10 minutes until the voltage fall after the power switch is turned off.

DANGER

Across a Ð b (0V line)....................

Across a Ð ground..........................

Across b (0V line)Ð ground............

approx 260-360V approx 155-170V approx 155-170V

When using an oscilloscope, never ground it. Don't forget that high voltages as noted above may apply to the oscilloscope.

DANGER

Always keep your hands and metallic things away from the enclosure of the oscilloscope.

DANGER!

Dont install

the ground

line.

Oscilloscope

Outdoor unit P.W.B.

– 100 –

RAC-50YH5

1. Turn OFF the Power supply to the outdoor unit.

2. After power is turned off, wait for 10 minutes or more. Then, remove electrical parts cover and apply soldering iron of 30 to 75W for 15 seconds or more to P2 and N1 terminals on system power module, in order to discharge voltage in smoothing capacitor.

3. Remove receptable of red/gray lead wire connected to system power module from diode stack before performing operation chech of each circuit.

Caution

●

Voltage of about 300-330V is charged between both ends of smoothing capacitors

●

During continuity check for each part of circuit in indoor unit electrical parts, disconnect red/gray lead wire connected from diode stack to system power module (SPM2) to prevent secondary trouble. (Be sure to discharge smoothing capacitor)

Do not use a soldering iron with transformer: If one is used, thermal fuse inside transformer will be blown

DISCHARGE PROCEDURE AND POWER SHUT OFF METHOD FOR POWER CIRCUIT

WARNING

As shown above, apply soldering iron to metal parts (receptable) inside the sleeve corresponding to P1 and N1 terminals of system power module: Do this with smoothing capacitors kept connected. By removing red/ gray lead wire from diode stack, power supply can be shut off. (corresponding to + and – terminals of system power module)

N1

P1

Soldering iron

System power module

SPM2

Smoothing capacitors

– 101 –

CHECKING THE INDOOR/OUTDOOR UNIT ELECTRICAL PARTS AND REFRIGERATING CYCLE

Model RAC-50YH5

Does the timer lamp on the indoor unit blink?

Is the compressor in the outdoor unit operating?

Does the operation lamp on the indoor unit start to light or blink?

Remove the outdoor unit cover and electrical parts cover, and check self-diagnosis lamp LD301

Does LD301 blink one time ? * Repeats 0.25-second on and 2-second off.

Blinking other than one time

One-time blinking

Yes

Yes No

No

Normal

No

Timer lamp

Press the service switch for 1 sec. Does the compressor operate? (After checking, be sure to press the service switch to stop the operation).

Check the refrigerating cycle.

Check the outdoor electrical parts.

Check the indoor electrical parts.

Check to see whether the Fcable is connected incorrectly or disconnected

See Out door unit self-diagnosis lamp lighting mode .

See Troubleshooting when the timer lamp blinks .

Is approx. DC 33 to 37V being generated? Is the polarity correct?

Remove the terminal cover and check the voltage between terminal (C) and terminal (D)

Service switch

P. W. B Self diagnosis lamps (LD303, 302, 301)

CN17

IC3

022527

– 102 –

TROUBLESHOOTING WHEN TIMER LAMP BLINKS. Model RAS-50FH5 Perform troubleshooting according to the number of times the indoor timer lamp and outdoor LD301 blink.

SELF-DIAGNOSIS LIGHTING MODE Model: RAS-50FH5

No. Blinking of Timer lamp Reason for indication Possible cause

Reversing valve defective When the indoor heat exchanger temperature is too low in the heating mode or it is too high in the cooling mode.

Outdoor unit forced operation When the outdoor unit is in forced operation or balancing operation after forced operation

Indoor/outdoor interface defective When the interface signal from the outdoor unit is interrupted.

Outdoor electrical assembly defective.

Room thermistor or heat exchanger thermistor is faulty When room thermistor or heat exchanger thermistor is opened circuit or short circuit.

Over-current detection at the DC fan motor when over-current is detected at the DC fan motor of the indoor unit.

IC401 or IC402 data reading error When data read from IC401 or IC402 is incorrect.

(1) Reversing valve defective (2) Heat exchanger thermistor

disconnected

(only in the heating mode) (Note) The malfunction mode is entered the 3rd time this abnormal indication appears (read every 3 minutes).

Electrical parts in the outdoor unit

(1) Indoor interface circuit (2) Outdoor interface circuit

Please check at the outdoor electrical led lamp blinking (LD301) and refer to self diagnosis lighting mode for outdoor unit.

(1) Room thermistor (2) Heat exchanger thermistor

(1) Indoor fan locked (2) Indoor fan motor (3) Indoor control P.W.B.

IC401 or IC402 abnormal

(1) If the interface circuit is faulty when power is supplied, the self-diagnosis display will not be displayed. (2) If the indoor unit does not operate at all, check to see if the F-cable is connected or disconnected. (3) To check operation again when the timer lamp is blinking, you can use the remote control for operation

(except for mode mark

1).

1

2

3

4

5

6

7

( Ð Ð Lights for 0.5 sec. at interval of 0.5 sec..)

10 times

3 times

РРРРРРРРР

РРРРРРР

РРРРРР

ÐÐÐ

1 time

2 times

13 times

5sec.

1

9 times

5sec.

4 times

5sec.

– 103 –

SELF-DIAGNOSIS LIGHTING MODE

MODEL: RAC-50YH5

– 104 –

1. Power does not come on (no operation)

Is AC 220-240V AC being generated between terminals L and N on the outdoor unit terminal board?

Is DC 35V being generated between terminals C and D on the outdoor unit terminal board?

Check the indoor/outdoor unit connection cable, and correct any defective section (wrong connection, incomplete insertion reversed).

Check AC outlet and breaker, and repair any defective part.

Check the outdoor unit power circuit, and repair the defective section.

Is DC 35V being generated between terminals C and D on the terminal board?

Are control voltages (12V, 5V) being generated normally?

Check according to the proper method for checking the power circuit.

No No

No

Yes

Do the air deflectors perform initial operation when the power supply is turned on and off?

Check the indication P.W.B. connection cord and light receiving unit.

No

Is the microcomputer reset input (pin 7 )ÒHiÓ?

Replace the control P.W.B

Perform final operation check.

Check the reset circuit, and repair any defective section.

Yes

No

Is the microcomputer clock signal 10MHz at pin

10 11

being

generated normally?

Replace the microcomputer and oscillator.

Yes

CHECKING INDOOR UNIT ELECTRICAL PARTS

– 105 –

2. Outdoor unit does not operate (but receives remote infrared signal)

Set to room temperature 16 C in the cooling mode or to 32

C in the heating mode, and

press the start/stop button.

Remove the outdoor unit cover and electrical parts cover, and check self- diagnosis lamp LD301.

Does LD301 blink one time? *Repeats 0.25-second on and 2-second off.

No

Does outdoor electrical part LD301 blink nine times?

Does LD303 switch off several second after it lights?

Perform final operation check.

Check outdoor electrical parts, and repair any defective parts.

Check outdoor electrical parts, and repair any defective parts (around the outdoor interface transmitting circuit).

Check the indoor interface transmitting circuit. Replace IC801.

Check outdoor electrical parts, and repair any defective parts (around the outdoor interface transmitting circuit).

Check the room temperature thermistor; if it is defective, replace it. <Normal values>

10

C➞approx. 20k 25 C➞approx. 10k 30 C➞approx. 8k

Check the heat exchanger thermistor; if it is defective, replace it. <Normal values>

10

C➞approx. 20k 25 C➞approx. 10k 30 C➞approx. 8k

Is the indoor/outdoor unit communication signal superimposed on 35V DC of connection wires C and D?

Is the indoor transmitting signal being generated at Q801Õs collector?

No

Yes

0V

Approx.

35V

Approx.

35V

38kHz Approx. 2Vp-p

Transmission waveform

Self diagnosis lamps (LD303, 302, 301)

– 106 –

3. Only indoor fan does not operate (other is normal)

Can the fan be stopped by remote control?

Are pulse signals output at microcomputer pin

15

- 18when auto

swing is turned on in the fan mode?

Is a voltage over 15V or below 10V being generated on the 12V line

Replace IC111

Replace the microcomputer

Check IC711. If it is normal, replace the air deflector motor.

Replace the microcomputer.

Replace the indoor fan motor.

Replace the microcomputer.

Perform final operation check.

The microcomputer fan PWM output (pin) is “Hi”

Yes Yes

Yes

No

Yes

No

Yes

No

Set to the “Hi” fan mode.

The operation lamp lights once and goes out in 5-10 seconds.

Disconnect CN10 and set to the fan mode again.

Replace the indoor fan motor.

The operation lamps lights once and goes out in 5-10 seconds.

Check to see if shorting etc. has occurred in the P.W.B pattern

Check to see if the indoor fan is touching the chassis, etc. If it does repair

Can the indoor fan be lightly turned by hand? (Switch of main power before check)

4. Air deflector does not move (others are normal)

5. All systems stop from several seconds to several minutes after operation is started (all indicators are also off)

– 107 –

6. Check the main P.W.B (power circuit)

Is DC 35V being output between cathode and anode of D101?

Is DC 12V being output?

Is DC 5V being output?

Is ICP2 normal? Normal if it is less than 1

.

Blown (open) if it is 1

or more

Is ICP1 normal? Normal if it is less than 1

.

Blown (open) if it is 1

or more

Replace ICP1. Check if shorting has occurred in the air deflector motor. If these are defective, ICP1 will be open again.

Replace REG2. Check the 5V line: if the 5V line is shorted, ICP1 will be open again.

No

Replace IC111.

Perform final operation check.

No

Replace ICP2. Check if shorting has occurred in fan motor circuit and 35V interface circuit. If these are defective, ICP2 will be open again.

No

YesYes

Yes

– 108 –

Turn on an AM radio, bring

the remote control switch within

15 cm of the radio, and press

the ON/OFF button.

Check the indoor unit signal

receiving P.W. B..

If it is good, check the main P. W.B..

You can check the remote control switch by other methods as explained below.

Using the test card

The sensible area should flash in orange when you operate the remote control unit if it is good.

Ultra redray test card

Sensible area

Within 2 cm

Check functions again.

If it does not work, replace

the remote controller.

ÒBuzzÓ

Within 15 cm

[AM radio]

Check the LED (D1) with

a multimeter.

Replace the battery.

Install the battery in the correct polarity.

Yes

No

Yes

Does the radio buzz noisily?

Is battery polarity correct?

Is the battery check sign + Ð

flashing?

CHECKING THE REMOTE CONTROLLER

– 109 –

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Hitachi RAS-50FH5, RAC-50YH5, RAS-50YH5 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual