Hitachi RAI-25NH5, RAI-35NH5 Service Manual

SERVICE MANUAL

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY

RAI-ECPM RAI-25NH5 RAI-35NH5

NOTE:

This manual describes only points that differ from

RAK-18NH5, 25NH5, 35NH5 (PM NO. 0269E) and

RAM-40QH5 (PM NO. 0270E) for items not described

in this manual.

PM

NO. 0271E

RAI-25NH5 RAI-35NH5

REFER TO THE FOUNDATION MANUAL

CONTENTS

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

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

CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 27

MAIN PARTS COMPONENT --------------------------------------------------- 28

WIRING DIAGRAM ---------------------------------------------------------------- 29

CIRCUIT DIAGRAM --------------------------------------------------------------- 31

PRINTED WIRING BOARD LOCATION DIAGRAM --------------------- 35

BLOCK DIAGRAM ----------------------------------------------------------------- 37

BASIC MODE ----------------------------------------------------------------------- 39

REFRIGERATING CYCLE DIAGRAM --------------------------------------- 53

AUTO SWING FUNCTION ------------------------------------------------------ 55

DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 56

SERVICE CALL Q & A ---------------------------------------------------------- 61

TROUBLE SHOOTING ----------------------------------------------------------- 64

PARTS LIST AND DIAGRAM -------------------------------------------------- 69

SPECIFICATIONS

TYPE

MODEL

POWER SOURCE

TOTAL INPUT

COOLING

HEATING

DIMENSIONS (mm)

NET WEIGHT

TOTAL AMPERES

CAPACITY

TOTAL INPUT

TOTAL AMPERES

CAPACITY

1 PHASE, 50 Hz, 220-240V

(W)

(A)

(kW)

(B.T.U./h)

(W)

(A)

(kW)

(B.T.U./h)

W

H

D

(kg)

DC INVERTER (CEILING CASSETTE TYPE)

INDOOR UNIT

RAI-25NH5

1 PHASE, 50 Hz, 220-240V

REFER TO THE SPECIFICATIONS PAGE (5)

580

285

580

20

RAI-35NH5

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

580

285

580

20

ROOM AIR CONDITIONER

SEPTEMBER 2005

Refrigeration & Air-Conditioning Division

INDOOR UNIT

SAFETY DURING REPAIR WORK

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

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

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

First, I must disconnect the power cord plug

from the power outlet.

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

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

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

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

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

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

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

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

or more as measured by a 500V

DANGER

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

– i –

WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS

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

2. Object parts

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

3. Items to be observed in handling

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

the same way).

A conductive polyvinyl bag

IC

Fig. 1. Conductive Container

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

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

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

taken.

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

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

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

IC

Conductive sponge

Body earth (Elimik conductive band)

1M

Fig. 2. Body Earth

Clip for connection with a grounding wire

– 1 –

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

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

Working table

Bare copper wire (for body earth)

Staple

Fig. 3. Grounding of the working table

Soldering iron

2

Resistor of 1 M

Earth wire

Grounding wire

(1/2W)

Screw stop at the screwed part using a rag plate

Fig. 4. Grounding a soldering iron

Use a high insulation mode (100V, 10M

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

measuring instrument shortcircuit a load circuit or the like.

or higher) when ordinary iron is to be used.

– 2 –

CAUTION

!

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 (50°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.

– 3 –

SPECIFICATIONS

MODEL

FAN MOTOR

FAN MOTOR CAPACITOR

FAN MOTOR PROTECTOR

COMPRESSOR

COMPRESSOR MOTOR CAPACITOR

OVERLOAD PROTECTOR

OVERHEAT PROTECTOR

FUSE (for MICROPROCESSOR)

POWER RELAY

RAI-25NH5 RAI-35NH5

25W

NO

–

NO

POWER SWITCH

TEMPORARY SWITCH

SERVICE SWITCH

TRANSFORMER

VARISTOR

NOISE SUPPRESSOR

THERMOSTAT

REMOTE CONTROL SWITCH (LIQUID CRYSTAL)

REFRIGERANT CHARGING VOLUME (Refrigerant 410A)

UNIT

PIPES

NO

YES

NO

YES(IC)

YES

----------

WITHOUT REFRIGERANT BECAUSE

COUPLING IS FLARE TYPE.

– 4 –

SPECIFICATIONS FOR INDOOR UNITS COMBINATIONS

CEILING CASSETTE TYPE DC INVERTER QUADRUPLE SYSTEM MULTI COOLING AND HEATING

RAI-25NH5 RAI-35NH5

2.50 (1.00 ~ 3.00)

8540 (3412~10236)

750 (200-880)

11.39

3.44 ~ 3.16

99

35

8.5m3/min

3.40 (1.10 ~ 4.40)

11610 (3761~15026)

870 (200-1120)

13.34

3.99 ~ 3.66

99

36

3

8.5m

YES (AUTO SWING)

3

NOT PROVIDED (POWER CORD SHOULD BE PREPARED AND CONNECTED TO OUTDOOR UNIT WHEN INSTALLED)

YES (WIRELESS) YES (WIRELESS)

MODEL

CIRCUIT AMPERES TO CONNECT (A)

COOLING

(ONE UNIT)

COOLING

(TWO UNITS)

HEATING

(ONE UNIT)

HEATING

(TWO UNITS)

TYPE

INDOOR UNIT

OUTDOOR UNIT

PHASE/VOLTAGE/FREQUENCY

CAPACITY (kW)

(B.T.U./h)

TOTAL INPUT (W)

EER (B.T.U./hW)

TOTAL AMPERES (A)

POWER FACTOR (%)

SOUND LEVEL (INDOOR)

AIR FLOW VOLUME (Hi)

CAPACITY (kW)

(B.T.U./h)

TOTAL INPUT (W)

EER (B.T.U./hW)

TOTAL AMPERES (A)

POWER FACTOR (%)

SOUND LEVEL (OUTDOOR)

CAPACITY (kW)

(B.T.U./h)

TOTAL INPUT (W)

EER (B.T.U./hW)

TOTAL AMPERES (A)

POWER FACTOR (%)

SOUND LEVEL (INDOOR)

AIR FLOW VOLUME (Hi)

CAPACITY (kW)

(B.T.U./h)

TOTAL INPUT (W)

EER (B.T.U./hW)

TOTAL AMPERES (A)

POWER FACTOR (%)

SOUND LEVEL (OUTDOOR)

AIR DEFLECTORS

FAN SPEED

LINE CORD

REMOTE CONTROL SWITCH

MAXIMUM LENGTH OF PIPING

STANDARD

RAM-40QH5

1ø, 220V-240V, 50Hz

16

11950 (3412~13660)

4.00 (1.50 ~ 4.50)

13660 (5126~15367)

1245 (200-1800)

10.97

5.72 ~ 5.24

99

49

14340 (3761~17070)

/min

5.00 (1.50 ~ 5.60)

17070 (5126~19122)

1350 (200-1780)

12.64

6.20 ~ 5.68

99

51

YES (AUTO SWING)

MAX. 35m (TWO UNITS TOTAL)

CE (EMC&LVD)

3.50 (1.00 ~ 4.00)

1090 (200-1300)

10.96

5.00 ~ 4.59

99

39

10.8m3/min

4.20 (1.10 ~ 5.00)

1080 (200-1300)

13.28

4.96 ~ 4.55

99

40

3

/min

10.8m

3

MODEL

W

PACKING (mm)

H

D

cu.ft.

GROSSWEIGHT (kg)

FLARENUTSIZE (SMALL/LARGE)

RAI-25NH5

760

395

706

7.48

25

6.35/9.52D

– 5 –

RAI-35NH5

760

395

706

7.48

25

6.35/9.52D

RAM-40QH5

905

633

394

8.27

43

6.35/9.52D, 6.35/9.52D

SAFETY PRECAUTION

●

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

●

Pay special attention to signs of “ Warning” and “ Caution”. The “Warning” section contains matters which, if not observed strictly, may cause death or serious injury. The “Caution” section contains matters which may result in serious consequences if not observed properly. Please observe all instructions strictly to ensure safety.

●

The sign indicate the following meanings.

!

Make sure to connect earth line.

Indicates the instructions that must be followed.

●

Please keep this manual after reading.

PRECAUTIONS DURING INSTALLATION

●

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

●

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

!

WARNING

!

CAUTION

your unit. Water leakage, short circuit or fire may occur if you install the unit by yourself.

●

Please use earth line. Do not place the earth line near water or gas pipes, lightning-conductor, or

the earth line of telephone. Improper installation of earth line may cause electric shock.

●

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

●

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

●

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

The sign in the figure indicates prohibition.

W

A R N

N G

W

A R N

N

G

PRECAUTIONS DURING SHIFTING OR MAINTENANCE

●

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

!

I

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

●

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

●

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

PRECAUTIONS DURING OPERATION

●

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

!

●

Do not 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.

●

I

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

●

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

– 6 –

PRECAUTIONS DURING OPERATION

●

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

●

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

●

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

●

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

●

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

●

Do not splash or direct water to the body of the unit when cleaning it as this

!

may cause short circuit.

C A U T

I

●

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.

O N

●

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

●

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

●

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

●

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

●

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

●

This appliance is not 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.

– 7 –

NAMES AND FUNCTIONS OF EACH PART

INDOOR UNIT

AIR FILTER

To prevent dust from coming into the indoor unit. (Refer page 23)

INDOOR UNIT INDICATORS

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

SUCTION GRILL (AIR INLET)

HORIZONTAL DEFLECTOR (AIR OUTLET)

(Refer page 19)

REMOTE CONTROL

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

MODEL NAME AND DIMENSIONS

MODEL

RAI-25NH5 / RAI-35NH5

WIDTH (mm)

580

HEIGHT (mm)

285

DEPTH (mm)

580

MULTI-AIR CONDITIONER

With this multi-air conditioner, several indoor units can be connected to one outdoor unit to be driven. You can operate the required number of indoor units.

Combination of Operations:

When operation mode is selected:

● You cannot operate the indoor units in the

following combinations.

One unit

Heating

During automatic operation:

● When heating operation is automatically selected for the first indoor unit, the next indoor unit will then start to heat.

Also, if cooling or dehumidifying is automatically selected for the first indoor unit, the next indoor unit will also start to cool or dehumidify.

Other unit

Cooling

Dehumidifying

Circulating (fan)

● The indoor unit which is switched on first continues to

operate, but other indoor units which is switched on later does not operate while the lamp lights.

● To re-start an indoor unit which was operated later, stop

the indoor unit which was operated first or later and reset the type of operation, then perform operation again.

Adjusting the Number of Indoor Units:

Decrease the number of indoor units to be operated especially when it is very hot or cold or when you want to reach the present temperature quickly.

Stopped Indoor Units:

When an indoor unit is operated in the cooling, heating or dehumidifying mode in the room, the sound of refrigerant flow may be heard from a stopped indoor unit or a stopped indoor unit may become warm. This is because the indoor unit returns refrigerant to the outdoor unit to be ready for operation.

– 8 –

OPERATION INDICATOR

TEMPORARY SWITCH

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 will be done in automatic mode.

INDOOR UNIT INDICATORS

OPERATION LAMP

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

(1) During preheating

For about 2–3 minutes after starting up.

(2) During defrosting

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

Press

Nonconducted stick

Temporary Switch

about 5.5mm

– 9 –

TIMER LAMP

This lamp lights when the timer is working.

FILTER LAMP

When the device is operated for a total of about 200 hours, the FILTER lamp lights to indicate that it is time to clean the filter. The lamp goes out when the “ (AUTO SWING)” button is pressed while the device is on “STANDBY MODE”.

NAMES AND FUNCTIONS OF REMOTE CONTROL UNIT

REMOTE CONTROLLER

● Operate by pointing towards the signal receptor on the indoor unit. The range of control is

about 7 meters. Signal receivable angle range is approximately 70°. However, if there is an electronic light sensor device (inverter) in the room, signal may not be received or receivable distance may become shorter.

● Indoor unit must be install 1 meter or more away from lighting.

● 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.

CH

˚

CH

˚

RESET

AUTO

HEAT

DEHUMIDIFY

COOL

FAN

FAN SPEED LOW MED HI

SLEEPING

STOP (CANCEL)

START (RESERVE)

START/STOP

TIME

TIMER SET

TIMER SELECTOR ON TIMER OFF TIMER

AUTO SWING

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.

▲

Approximately 70°

– 10 –

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.

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.

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.

1

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).

RESET

START

STOP

Press the (START/STOP) button. 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.

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

°C

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

● The display does not indicate the preset temperature in the AUTO mode. If you change the setting, the indoor unit will produce a beep.

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

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

– 11 –

HEATING OPERATION

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

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

● 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.

RESET

C

˚

1

2

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

3

C

˚

START

STOP

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

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.

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

– 12 –

DEHUMIDIFYING OPERATION

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

Press the FUNCTION selector so that the display indicates

(DEHUMIDIFY). The FAN SPEED is set at LOW automatically. The FAN SPEED button does not work.

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

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

RESET

C

˚

1

2

C

˚

■ Dehumidifying Function

START

STOP

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

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

only have to press the

(START/STOP) button next time.

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

– 13 –

COOLING OPERATION

Use the device for cooling when the outdoor temperature is 22-42°C. If 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

C

˚

1

(COOL).

RESET

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

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

MED or LOW automatically when the preset

2

(HI) : Economical as the room will become cool

(MED) : Fan speed slow.

(LOW) : Fan speed slower.

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

3

C

˚

START

STOP

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

Press the 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.

temperature has been reached.

quickly.

(START/STOP) button. Cooling operation starts

(FAN SPEED) button

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

only have to press the

(START/STOP) button next time.

– 14 –

FAN OPERATION

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

Press the FUNCTION selector so that the display indicates

1

(FAN).

RESET

FAN SPEED (AUTO)

For the heating operation

2

START

STOP

.....

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

● The fan speed will automatically change according to the temperature

of discharged air.

● When the difference of room temperature and setting temperature is

large, fan starts to run at HI speed.

● When the room temperature reaches setting temperature, fan speed

changes to LOW automatically.

Press the (FAN SPEED) button.

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

For the cooling operation

● When the difference of room temperature and setting temperature is

large, fan starts to run at HI speed.

● After room temperature reaches the preset temperature, the cooling

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

– 15 –

HOW TO SET THE TIMER

RESET

Time, Day, Month

TIME, DAY, MONTH (current time,

After you change the batteries;

day, month)

OFF TIMER

ON TIMER

OFF-Timer

RESERVE

CANCEL

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

ON-Timer

● The device will turn on

at the designated times.

Start

M D

STOP

Stop

Start

1

Set the current month and

day with the TIMER control button.

M D

1

Press the (OFF-TIMER)

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

AM

1

Press the (ON-TIMER)

button the (ON) mark blinks on the display.

AM

3

ON/OFF-Timer

Start Stop

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

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

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

1

Press the (ON-OFF)

button so that the (OFF) mark blinks.

PM

2

Set the turn-off time

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

PM

Press the (ON-

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

PM

AM

How to Cancel Reservation

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

NOTE

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

– 16 –

2

Press the

(TIME) button.

AM PM PM

2

Set the turn-off time with the

TIMER control button.

3

TIMER control button.

PM

Set the current time with the

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

3

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

press the (RESERVE) button. The (OFF) mark starts lighting instead of flashing and the sign (RESERVED) lights. A beep occurs and the (TIMER) lamp lights on the indoor unit.

4

Press the (TIME) button again.

The time indication starts lighting instead of flashing.

● The time indication will disappear

PM

● To check the current time setting,

automatically in 10 second.

press the (TIME) button twice.

The setting of the current time is now complete.

2

Set the turn-on time with the

TIMER control button.

AM

4

Set the turn-on time with the

TIMER control button.

PM

AM

PM

The setting of turn-off time is now complete.

3

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

press the (RESERVE) button. The (ON) mark starts lighting instead of flashing and the (RESERVED) sign lights. A beep occurs and the (TIMER) lamp lights on the indoor unit.

Example:

AM

5

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

press the (RESERVE) button. The (ON) mark starts lighting instead of flashing and the (RESERVED) sign lights. A beep occurs and the (TIMER) lamp lights on the indoor unit.

PM

AM

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

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

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

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

the current time at first because it serves as a reference.

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

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

– 17 –

HOW TO SET THE SLEEP 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

44 44

H

SLEEP

Sleep timer

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.

H

Sleep

timer

1

Set the ON-timer.

Start

1 hour 2 hours 3 hours 7 hours

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

Indication

Sleep timer off

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

1

2

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

AM

H

AM

For heating:

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

How to Cancel Reservation

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

– 18 –

ADJUSTING THE AIR DEFLECTOR

about 45˚

SWINGING

RANGE

45˚

about 45˚

SWINGING RANGE

45˚

Adjustment of the conditioned air in the upward and

1

downward directions.

According to “Dehumidifying” or “Cooling” operation, the horizontal air deflector is automatically set to the proper angle suitable for each operation. The deflector can be swung up and down and also set to the desired angle using the “ (AUTO SWING)” button. (If the angle of the deflector is changed, it will not return to the autoset position after operations start unless the operation mode is switched.)

● 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.

RESET

● When the “ (AUTO SWING)” button is

pressed while the operation is stopped, the horizontal air deflector moves and stops at the position where the air outlet closes.

● When the auto swing operation is performed, if the

horizontal air deflector is moved manually, the swinging range may drift. However, it will return to the original operation range after a short time.

CAUTION

!

When operating the unit in cooling operation with the air deflector facing down and moving automatically for a long period of time, water will condensed on the air deflector and drips down occasionally. This will wet your furniture.

– 19 –

HOW TO EXCHANGE THE BATTERIES IN THE REMOTE CONTROLLER

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

1

old batteries.

=

Install the new batteries.

2

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

!

CAUTION

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

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

Push and pull to the direction of arrow

– 20 –

THE IDEAL WAYS OF OPERATION

Suitable Room Temperature Install curtain or blinds

!

Warning

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

Ventilation Effective Usage Of Timer

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

!

Caution

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

Do Not Forget To Clean The Air Filter

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

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

Please Adjust Suitable Temperature

For Baby And Children

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

– 21 –

FOR USER’S INFORMATION

The Air Conditioner And The Heat Source In The Room

!

Caution

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

Not Operating For A Long Time

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

OFF

When Lightning Occurs

!

Warning

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

Interference From Electrical Products

!

Caution

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

To prevent interference, place at least 1m away.

Inverter-type fluorescent lamp.

TV

– 22 –

MAINTENANCE

!

CAUTION

Cleaning and maintenance must be carried out by qualified service personnel. Before the cleaning, stop operation and disconnect the power supply.

Clean the filter at least once every one month. This helps save electricity cost.

1. CLEANING OF AIR FILTER

REMOVAL AND ATTACHMENT OF AIR FILTER

PROCEDURE

1

2

3

Remove the filter from indoor

● Press the mark “PUSH” on the left and

right sides of the suction grille.

● Pull out the filter from the grille.

Remove dust from the filter using a vacuum cleaner. If there is too much dust, use neutral detergent. After using neutral detergent, wash with clean water and dry in the shade.

Install the filter. (Set it with “UP SIDE” mark facing front.) Slot the filter to suction grille and close as original state. (Press the mark “PUSH” at the left and right sides of the suction grille to fix it securely.)

Safety Cable

Air Filter

PUSH

Filter Guide

Grille

Note:

● This model has an air cleaning filter. The cooling capacity is slightly weakened and the cooling

speed becomes slower when the air cleaning filter is used. So, set the fan speed to “HIGH” when using it in this condition.

● Recommended to replace the air cleaning filter after every 3 months for normal usage. Type number

for this air cleaning filter is <SPX-CFH5>. Please use this number for ordering when you want to renew it.

!

CAUTION

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

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

the sun. The filter may shrink.

● Do not operate the air conditioner with the filter removed. Dust may enter the air conditioner and

cause trouble.

– 23 –

2. CLEANING OF FRONT PANEL

● Wipe it with a soft dry cloth.

● When it is excessively dirty, wipe with soft cloth soaked in lukewarm water or neutral detergent. Then

wipe thoroughly with a soft dry cloth.

!

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.

3. MAINTENANCE AT BEGINNING OF LONG OFF PERIOD

● Running the unit setting the operation mode to (FAN) and

the fan speed to HI for about half a day on a fine day, and dry the whole of the unit.

● Turn off the circuit breaker.

Air

Blow

REGULAR INSPECTION

PLEASE CHECK THE FOLLOWING POINTS EITHER EVERY HALF YEARLY OR YEARLY. CONTACT YOUR SALES AGENT SHOULD YOU NEED ANY HELP.

Is the earth line disconnected or broken?

WARNING

1

2

!

Coming off or breakage of grounding wire may cause malfunction or electrical shock.

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

!

WARNING

Outdoor unit may fall or drop if there is extreme rust on mounting frame or outdoor unit is unstably installed. This may cause injury.

3

Confirm

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

– 24 –

AFTER SALES SERVICE AND WARRANTY

WHEN ASKING FOR SERVICE, CHECK THE FOLLOWING POINTS.

CONDITION CHECK THE FOLLOWING POINTS

● Is the fuse blown out or the circuit breaker tripped?

When it does not operate

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

Notes

● In quiet operation or stopping the running, 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

● 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 please clean the air filter and the evaporator regularly to reduce the odor.

● Is the voltage normal?

● Is the circuit breaker “ON”?

● Is the air filter blocked with dust?

● Does sunlight fall directly on the outdoor unit?

● Is the air flow of the outdoor unit obstructed?

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

heat in the room?

● Is the set temperature suitable?

gradually warmed as operation stops.

●

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.

– 25 –

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.

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

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

MEMO

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

– 26 –

CONSTRUCTION AND DIMENSIONAL DIAGRAM

MODEL RAI-25NH5, RAI-35NH5

650 (Panel)

600 (Opening on ceiling)

580 (Indoor unit)

400 (Suspension bolt)

64

42

393 (Electric box)

580 (Indoor unit)

650 (Panel)

610 (Suspension bolt)

600 (Opening on ceiling)

Narrow pipe ﬂ6.35

Wide pipe ﬂ12.7

Unit : mm

147

56 18

Wireless remote controller

97 (Drain)

65

Drain outlet

42

Above 300

110

Panel (Optional part RAI-ECPM)

Ceiling

285

32

55

62

230 (Drain)

227 (Electric box)

112

Air outlet

Air inlet Air outlet

Note:

1. Insulated pipes should be used for both the narrow and wide dia. pipes.

2. Piping length is within 20m.

3. Height difference of the piping between the indoor unit and the outdoor unit should be within 10m.

4. An F-cable 1.6mm or 2.0mm dia. X 3 (control side) is used for the connection cable.

– 27 –

MAIN PARTS COMPONENT

THERMOSTAT

Thermostat Specifications

THERMOSTAT MODEL IC

OPERATION MODE COOL HEAT

MODEL RAI-25NH5 RAI-35NH5 RAI-25NH5, RAI-35NH5

ON 15.0 (59.0) 13.0 (55.4) 20.0 (68.0)

OFF 14.7 (58.5) 12.7 (54.9) 20.3 (68.5)

ON 23.0 (73.4) 21.0 (69.8) 28.0 (82.4)

OFF 22.7 (72.9) 20.7 (69.3) 28.3 (82.9)

ON 31.0 (87.8) 29.0 (84.2) 36.0 (96.8)

OFF

30.7 (87.3) 28.7 (83.7) 36.3 (97.9)

TEMPERATURE °C (°F)

INDICATION

16

INDICATION

24

INDICATION

32

FAN MOTOR

Fan Motor Specifications

MODEL

RAI-25NH5 RAI-35NH5

POWER SOURCE DC: 0 ~ 35V

OUTPUT 25W

RED

YEL

BLU

M

CONNECTION

0~35V

5V

(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

– 28 –

MODEL RAI-25NH5 / RAI-35NH5

WIRING DIAGRAM

INDOOR UNIT

– 29 –

CIRCUIT DIAGRAM

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

Key matrix table

P10

P11

P12

Output

Input

D0

Door open Automatic swingFan speed selectionOperation selectionStart/Stop

Door shut ––Automatic swingStart/Stop

Door open Day

Door shut Fan speedRoom temperature downRoom temperature up–

Door open CancelReservation–Off timer

Door shut –––Sleep

D3D2D1

• present timeHour downHour upOn timer

– 31 –

CIRCUIT DIAGRAM

MODEL RAI-25NH5, RAI-35NH5

– 33 –

PRINTED WIRING BOARD LOCATION DIAGRAM

MODEL RAI-25NH5, RAI-35NH5

MAIN P.W.B.

Marking on P.W.B.

COMPONENT SIDE

SOLDERING SIDE

– 35 –

RAI-25NH5, RAI-35NH5

INDOOR UNIT 1

LCD wireless

Room temperature thermistor

Heat exchanger thermistor

Temporary switch

Initial setting circuit

Reset circuit

Wireless receive circuit

Indoor microcomputer (AX-7R11)

Filter. Operation. Timer.

Drain Pump Motor

Auto sweep motor for Air deflector

SPM2

L

N

Outdoor unit Terminal board

Trip signal synthesis circuit

INDOOR UNIT 2

LCD wireless

Room temperature thermistor

Heat exchanger thermistor

Temporary switch

Initial setting circuit

Reset circuit

Wireless receive circuit

Indoor microcomputer (AX-7R11)

Filter. Operation. Timer.

Drain Pump Motor

Auto sweep motor for Air deflector

C1

D1

C2

D2

Indoor 1/Outdoor interface circuit

Indoor 2/Outdoor interface circuit

Outdoor microcomputer / HIC (AX-6M01)

Electric Expansion valve drive circuit

Electric

Expansion

valve

– 37 –

RAI-25NH5, RAI-35NH5

47.

– 39 –

Table 1 Mode data file

RAI-25NH5 RAI-35NH5

LABEL NAME VALUE

WMAX 4400 min

WMAX2 4500 min

WSTD 3300 min

WBEMAX 2800 min

CMAX 2900 min

CMAX2 3000 min

CSTD 2350 min

CKYMAX 2200 min

CJKMAX 1800 min

CBEMAX 1600 min

WMIN 1500 min

CMIN 1500 min

–1

6000 min

4250 min

3500 min

4700 min

4100 min

3500 min

2700 min

2000 min

1800 min

–1

STARTMC 60 Seconds 60 Seconds

DWNRATEW 80% 80%

DWNRATEC 80% 80%

SHIFTW 4.00°C 4.00°C

SHIFTC –1.00°C –2.99°C

CLMXTP 30.00°C 30.00°C

YNEOF 21.00°C 21.00°C

TEION 2.00°C 2.00°C

TEIOF 6.00°C 6.00°C

SFTDSW 2.66°C 2.66°C

DFTIM1 50 Minutes 50 Minutes

DFTIM2 90 Minutes 90 Minutes

DFTIM3 60 Minutes 60 Minutes

– 41 –

NOTE (9)

Reversing valve (heating “on” mode)

Notes: (1) Condition for entering into Cool Dashed mode. When fan set to “Hi” or “Auto mode” and temperature difference between indoor temperature and set temperature has a

corresponding compressor rpm 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 –3°C (thermo off) and iii) when room temperature

has achieved setting temperature –1°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) –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 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 “Hi”, compressor rpm will be limited to CKYMAX. (7) When fan is set to “Med”, compressor rpm will be limited to CJKMAX. (8) When fan is set to “Lo”, compressor rpm will be limited to CBEMAX. (9) During Cool Dashed, when room temperature reaches set temperature –1°C compressor rpm is actual rpm x DWNRATEC.

Table 2 ∆TCMAX

Temperature Calculated

difference compressor rpm

1.66 2265 min

2 2435 min

2.33 2600 min

2.66 2765 min

3 2935 min

3.33 3100 min

3.66 3265 min

4 3435 min

4.33 3600 min

4.66 3765 min

5 3935 min

5.33 4100 min

5.66 4265 min

6 4435 min

6.33 4600 min

6.66 4765 min

7 4935 min

7.33 5100 min

7.66 5265 min

8 5435 min

8.33 5600 min

8.66 5765 min

9 5935 min

9.33 6100 min

9.66 6265 min

10 6435 min

10.33 6600 min

10.66 6765 min

11 6935 min

–1

Note:

1. See the data in Table 1 on page 45 for each constant in capital letters in the diagrams.

– 43 –

Cooling Sleep Operation

Compressor speed

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

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.

– 45 –

+

Delay

–1.33˚C

–0.66˚C

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.

– 47 –

1.33˚C.

SFTDSW

0.66˚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

Compressor speed

Outdoor fan

Reversing valve (heating "on" model)

Thermo OFF

Dash period

TWMAX

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 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.

Table 3 ∆TWMAX

Temperature Calculated

difference compressor rpm

1.66 1965 min

2 2135 min

2.33 2300 min

2.66 2465 min

3 2635 min

3.33 2800 min

3.66 2965 min

4 3135 min

4.33 3300 min

4.66 3465 min

5 3635 min

5.33 3800 min

5.66 3965 min

6 4135 min

6.33 4300 min

6.66 4465 min

7 4635 min

7.33 4800 min

7.66 4965 min

8 5135 min

8.33 5300 min

8.66 5465 min

9 5635 min

9.33 5800 min

9.66 5965 min

10 6135 min

10.33 6300 min

10.66 6465 min

11 6635 min

–1

Notes:

1. See the data in Table 1 on page 45 for each constant in capital letters in the diagrams.

– 49 –

1 min

WMIN

TDF TDF TDF

TDF

Setting Defrosting Inhibit Period

D F T I M 3

D F T I M 2

Time

Outdoor temperature

– 1 0 – 5˚C0˚C

D F T I M 1

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 WSTD+2000/2, and the indoor fan is set

to “sleep Lo”. (3) 30 minutes after the sleep key is set, the sleep shift of set temperature starts. (4) The maximum sleep shift of set temperature is 5°C, and the minimum is 12°C. (5) If the operation mode is changed during sleep operation, the changed operation mode is set and sleep control

starts. (6) The indoor fan speed does not change even when the fan speed mode is changed. (Lo) (7) When defrosting is to be set during sleep operation, defrosting is engaged and sleep operation is restored after

defrosting. (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 time 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.

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] : DFTIM1 is set. Reverse cycle operation time < [DEFCOL] : The time corresponding to outdoor temperature is set.

– 51 –

Cooling, dehumidifying, defrosting

Outdoor Unit

Indoor Unit

Suction tank

Reversing

valve

Strainer

Service

valve (

1/4"

)

Service

valve (

3/8"

)

Service

valve (

3/8"

)

Single-ended

union (

3/8"

)

Single-ended

union (

3/8"

)

Single-ended

union (

1/4"

)

Indoor heat

exchanger

Air

Flow

Air

Flow

Indoor heat

exchanger

Single-ended

union (

1/4"

)

Charge port (

1/2"

)

Charge port (

1/2"

)

Service

valve (

1/4"

)

Electric expansion 1

valve

Electric expansion 2

valve

Strainer

Silencer

Compressor

REFRIGERATING CYCLE DIAGRAM

RAI-25NH5 / RAI-35NH5

– 53 –

Heating

Outdoor Unit

Indoor Unit

Suction tank

Reversing

valve

Strainer

Service

valve (

1/4"

)

Service

valve (

3/8"

)

Service

valve (

3/8"

)

Single-ended

union (

3/8"

)

Single-ended

union (

3/8"

)

Single-ended

union (

1/4"

)

Indoor heat

exchanger

Air

Flow

Air

Flow

Indoor heat

exchanger

Single-ended

union (

1/4"

)

Charge port (

1/2"

)

Charge port (

1/2"

)

Service

valve (

1/4"

)

Electric expansion 1

valve

Electric expansion 2

valve

Strainer

Silencer

(Scroll)

Compressor

REFRIGERATING CYCLE DIAGRAM

RAI-25NH5 / RAI-35NH5

– 54 –

REFERENCE

INITIALIZE AT NEXT

OPERATION.

OPERATING SPECIFICATION

INITIALIZE AT NEXT

OPERATION.

ONE SWING (CLOSING AIR DEFLECTOR)

PRESENT CONDITION

OPERATION OPERATION MODE AIR DEFLECTOR

STOP AT THE MOMENT.

1 DOWNWARD

2 UPWARD

STOP

DURING ONE SWING

EACH MODE

STOP

START SWINGING

1 DOWNWARD

2 UPWARD

STOP

AUTO COOL

COOL

FAN

STOP AT THE MOMENT.

3 DOWNWARD

DURING SWINGING

AUTO DRY

DRY

DURING

START SWINGING

1 DOWNWARD

2 UPWARD

3 DOWNWARD

STOP

AUTO HEAT

HEAT

CIRCULATOR

OPERATION

START SWING AGAIN.

STOP AT THE MOMENT.

DURING SWINGING

STOP SWINGING TEMPORARILY.

(SWING MODE IS CLEARED IF SWING COMMAND IS

TEMPORARY STOP

AUTO DRY

DURING SWINGING

DRY

AUTO HAET

HEAT

DURING

OPERATION

INITIALIZE

TRANSMITTED DURING TEMPORARY STOP.)

COOL

CIRCULATOR

1 DOWNWARD

2 UPWARD

INITIALIZE

STOP

DURING ONE SWING

STOP

FAN

DRY

HEAT

STOP

ONE SWING (CLOSING AIR DEFLECTOR)

1 DOWNWARD

DURING ONE SWING

STOP

CIRCULATOR

INITIALIZING CONDITION OF EACH MODE.

1 DOWNWARD

2 UPWARD

DURING SWINGING

DURING

INITIALIZING

EACH MODE

DURING

OPERATION

STOP SWINGING AND MODE BECOMES INITIALIZING

CONDITION.

STOP

DURING SWINGING

EACH MODE

DURING

OPERATION

INPUT SIGNAL

AUTO SWING FUNCTION

MODEL: RAI-25NH5, RAI-35NH5

KEY INPUT

– 55 –

THERMO. ON

(INTERNAL FAN

ON)

THERMO. ON

(INTERNAL FAN

OFF)

MAIN SWITCH

ON

MAIN SWITCH

OFF

CHANGE OF

OPERATION

DESCRIPTION OF MAIN CIRCUIT OPERATION

MODEL RAI-25NH5, RAI-35NH5

1. Reset Circuit

5V

2

R522

1

C521

R521

5

C524

NORMAL : HI RESET : LO

RES

7

Microcomputer

C522

Voltage

Voltage supply to

2

of IC521

Reset release at 4.4V

3

IC521

0V

Fig. 1-1

5.0V

Reset enter at 4.2V

voltage

Voltage at pin of microcomputer

7

5.0V

Fig. 1-2

● The reset circuit initializes the microcomputer program when power is ON or OFF.

● Low voltage at pin 7 resets the microcomputer and Hi activates the microcomputer.

● When power “ON” 5V voltage rises and reaches 4.4V, pin 1 of IC521 is set to “Hi”. At this time the

microcomputer starts operation.

● When power “OFF” voltage drops and reaches 4.2V, pin 1 of IC521 is set to “Low”. This will RESET the

microcomputer.

– 56 –

2. Receiver Circuit

R412

5V12V

R411

R413

ZD411

C411

0V

C413

C412

IRR

V

DD

GND

out

V

R611

C414

C611

0V

13

RECEIVER I/P

Microcomputer

Fig. 2-1

● 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

12V

R722

BZ

Microcomputer

Buzzer output

● When the buzzer sounds, an approx.

3.9kHz square signal is output from buzzer output pin of the microcomputer. After

30

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.

30

Fig. 3-1 Buzzer Circuit

Metal diaphragm

Sound wave

0V

Q722

Pizoelectric element

V

– 57 –

Fig. 3-2 Buzzer Operation

D712

P.W.B. MAIN

12V

CN8

Auto sweep motor for horizontal air deflector

Rotor

AUTO SWEEP

M

MOTOR

AUTO SWEEP

M

MOTOR

AUTO SWEEP

M

MOTOR

CN7

1

2

3

4

5

6

7

8

9

10

11

1

2

3

4

5

6

7

8

9

10

4. Auto Sweep Motor Circuit

22

21

20

Microcomputer

19

18

17

16

15

R711

IC711

7

6

5

4

3

2

1

R712

C712

9

8

Q711

Q712

0V

10

11

12

13

14

15

16

C711

0V

Fig.4-1

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

15 – 22 of microcomputer.

Microcomputer pins Step width

Horizontal air deflectors

15

16

1234 5678

Horizontal air

deflectors: 10ms.

17

18

19

20

21

22

Fig.4-2 Microcomputer Output Signals

● 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

● The air deflectors are driven by the stepping motors, which are instructed by the microcomputer.

● The air deflectors on the left and right are each driven by two stepping motors.

● The stepping motors and main unit are connected via relay connectors. The air deflectors will not operate

unless the relay connectors are connected: Securely connect the relay connectors identified by colors when attaching the panel.

● Before removing the panel for servicing, be sure to disconnect the relay connector to protect the lead

wires.

– 58 –

5. 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

Voltage at

(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

Voltage at

(V)A

● Fig. 5-1 shows the room temperature

thermistor circuit.

6. Heat exchanger temperature thermistor circuit

● The voltage at depends on the room

A

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

A

heat exchanger temperature as shown in Fig. 6-2.

– 59 –

7. Initial Setting Circuit (IC401)

● When power is supplied, the microcomputer reads the data in IC401 (E

2

PROM) 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; data will not be erased even when power is turned off.

5V

5V 5V

1

2

3

4

IC401 (E

0V

2

PROM)

8

7

6

5

0V

C401

0V

R404

R403

27 26

SCL SDA

Microcomputer

External ROM

}

Fig. 7-1

– 60 –

SERVICE CALL Q & A

Model RAI-25NH5

RAI-35NH5

COOLING MODE

Q1

The compressor has stopped suddenly during cooling operation.

DEHUMIDIFYING MODE

Q2

Q3

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

Compressor occasionally does not operate during dehumidifying.

HEATING MODE

Q4

The circulation stops occasionally during Heating mode.

A1

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

A2

A3

A4

It occurs during defrosting. Wait for 5-10 minutes until the condenser 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 temperature is 10°C or less. It also stops when the humidity is preset humidity or less.

Q5

Q6

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".

At the beginning of heating,

A5

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

A6

the outdoor, heating operation may stop to protect internal devices.

– 61 –

AUTO FRESH DEFROSTING

Q7

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

AUTO OPERATION

Q8

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

NICE TEMPERATURE RESERVATION

Q9

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

Auto Fresh Defrosting is carried out : the

A7

system checks the outdoor heat exchanger and defrosts it as necessary before stopping operation.

A8

At this point fan speed is automatic.

This is because “Nice temperature reservation”

A9

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.

Q10

Q11

Does “Nice temperature reservation” function operate during dehumidifying?

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

INFRARED REMOTE CONTROL

Q12

Q13

Q14

Timer cannot be set.

The current time display disappears soon.

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

A10

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

This is because “Nice temperature reservation”

A11

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.

A12

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

The current time disappears

A13

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

A14

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.

– 62 –

OTHERS

The indoor fan varies among

Q15

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

Q16

Q17

Q18

Q19

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

Noise from the outdoor unit occasionally changes.

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

Air does not flow immediately after operation is started.

A15

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

A16

A17

A18

A19

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.

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

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.

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.

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.

– 63 –

TROUBLESHOOTING WHEN TIMER LAMP BLINKS.

5

Model RAI-25NH5, RAI-35NH5 Perform troubleshooting according to the number of times the indoor timer lamp and outdoor LD301 blink.

SELF-DIAGNOSIS LIGHTING MODE Model: RAI-25NH5, RAI-35NH5

No. Timer indicator flashing mode Reason for display Section of estimated fault

Four-way valve faulty

The room heat exchange

1

5 sec.

– ––––––– Once

temperature is low during heating, or it is high during cooling.

(1) Four-way valve faulty. (2) Disconnection in heat exchange

thermistor (only during heating)

Outdoor unit forced operation

2

3

4

5

6

7

5 sec.

– –––––– Twice

5 sec.

– ––––– 3 times

5 sec.

–– 4 times

–– 6 times

–– 7 times

–– 9 times

The outdoor unit is in forced operation or undergoing balancing after forced operation.

Indoor/outdoor interface faulty

The interface signal from the outdoor unit has been interrupted.

Outdoor electrical assembly defective.

Abnormal water level detection

All stop when the float switch has been activated.

Drain pump forced operation.

When the knob of drain pump test switch at Indoor P.W.B main slide to ‘test’ position.

Room thermistor or heat exchanger thermistor is faulty

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

Service SW in outdoor electrical parts turned ON.

(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) Drain stopped up (2) Drain pump (3) Float switch

(1) Indoor P.W.B. Main.

(1) Room thermistor (2) Heat exchanger thermistor

8

9

1

5 sec.

–– 10 times

–– 13 times

DC fan motor overcurrent detection

Overcurrent in indoor DC fan motor has been detected.

IC401 data reading fault

There was error in the data read from IC401

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

IC401 faulty

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

(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).

– 64 –

CHECKING INDOOR UNIT ELECTRICAL PARTS

1. Power does not come on (no operation)

No No Is DC 35V being generated between terminals C and D on the terminal board?

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

Yes

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

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

Yes

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

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

Yes

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

No

Is the microcomputer reset input (pin 7 ) Hi ?

Yes

Is the microcomputer clock signal 10MHz at pin generated normally?

10 11

being

Yes

No

Yes

No

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

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

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

Check the reset circuit, and repair any defective section.

Replace the microcomputer and oscillator.

Replace the P.W.B Main

Perform final operation check.

– 65 –

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

Is approx 20 V DC generated between pins 2 (blue) and 4 (red) of CN 10 when operated at high fan speed during cooling?

No

Are pulses of approx. 33 Vp-p generated at the collectors of Q901 in the fan operation mode? Are collectors of Q903 approx. O V?

Yes

Are microcomputer fan PWM outputs (micro computer pins r)“Hi” or are pulses output in the fan operation mode?

No

Yes

Is 5 V DC generated between pins

2

(blue) and 1 (yellow) of CN10?

No

Is there 1 or less between L901 and L902?

Yes

Perform final operation check.

No

3. Indoor fan speed does not change (other is normal)

Has the fan been stopped by

Yes Yes

remote control?

No

Are microcomputer fan PWM outputs micro computer pins F “Hi”?

No

Are the collectors of Q903 approx OV?

No

Yes

Replace indoor fan motor.

Check disconnection, etc of lead wires.

Yes

Replace Q901.

Replace L901.

Replace Q903.

Replace micro computer.

Yes

Replace Q903.

Replace Q901.

Perform final operation check.

4. Air deflector does not move (other is normal)

Is pulse signal output to micro computer pins %~w with air deflector set to auto during cooling?

Yes

Is there a voltage higher than 15V across C114 (12 V line)?

No

Yes

Perform final operation check.

Replace micro computer.

Replace the air deflector motor.Replace IC111.

– 66 –

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

Set to the "Hi" fan mode.

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

Yes

Disconnect, CN10 and set to the fan mode again.

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

No

Can the indoor fan be lightly turned by hand? (Set the power switch to "off" to check.)

Yes

Replace the indoor fan motor.

Yes

No

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.

– 67 –

CHECKING THE REMOTE CONTROLLER

– 68 –

PARTS LIST AND DIAGRAM

INDOOR UNIT MODEL : RAI-25NH5

RAI-35NH5

17

15

18

7

14

3

2

13

1

8

5

6

4

12

– 69 –

MODEL RAI-25NH5

NO.

1 PMRAI-25NH4R R01 1 25W MOTOR

2 RAMD-350BW 011 1 FLOAT SWITCH

3 PMRAI-32CNH2 R02 1 THERMISTOR (HEAT EXCHANGER) 4 PMRAI-32CNH2 R03 1 THERMISTOR (ROOM TEMPERATURE)

5 PMRAI-32CNH2 004 1 TURBO FAN

6 PMRAI-32CNH2 R05 1 DRAIN PAN ASSEMBLY

7 PMRAS-51CHA1 011 1 REMOTE CONTROL ASSEMBLY

8 PMRAS-10C3M 003 1 REMOTE CONTROL SUPPORT

12 PMRAI-32CNH2 010 1 DRAIN CAP

13 PMRAI-25NH4 R04 1 DRAIN PUMP ASSEMBLY 14 PMRAI-25NH4 R03 1 CYCLE ASSEMBLY

15 PMRAI-25NH4 007 4 SUSP. CLAMP

17 PMRAS-10C6M R02 1 TERMINAL BOARD (2P)

PART N0.

RAI-25NH5

Q’TY / UNIT

PARTS NAME

18 PMRAI-25NH5 R01 1 P.W.B. (MAIN)

– 70 –

MODEL RAI-35NH5

NO.

1 PMRAI-25NH4R R01 1 25W MOTOR

2 RAMD-350BW 011 1 FLOAT SWITCH

3 PMRAI-32CNH2 R02 1 THERMISTOR (HEAT EXCHANGER) 4 PMRAI-32CNH2 R03 1 THERMISTOR (ROOM TEMPERATURE)

5 PMRAI-32CNH2 004 1 TURBO FAN

6 PMRAI-32CNH2 R05 1 DRAIN PAN ASSEMBLY

7 PMRAS-51CHA1 011 1 REMOTE CONTROL ASSEMBLY

8 PMRAS-10C3M 003 1 REMOTE CONTROL SUPPORT

12 PMRAI-32CNH2 010 1 DRAIN CAP

13 PMRAI-25NH4 R04 1 DRAIN PUMP ASSEMBLY 14 PMRAI-25NH4 R03 1 CYCLE ASSEMBLY

15 PMRAI-25NH4 007 4 SUSP. CLAMP

17 PMRAS-10C6M R02 1 TERMINAL BOARD (2P)

PART N0.

RAI-35NH5

Q’TY / UNIT

PARTS NAME

18 PMRAI-35NH5 R01 1 P.W.B. (MAIN)

– 71 –

HITACHI

RAI-25NH5 RAI-35NH5

PM NO. 0271E

Printed in Malaysia