Hitachi RAK-18NH6, RAK-35NH6, RAK-25NH6, RAK-50NH6 Service Manual

NO. 0355E

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

ROOM AIR CONDITIONER

INDOOR UNIT

MARCH 2007

Refrigeration & Air-Conditioning Division

SERVICE MANUAL

PM

REFER TO THE FOUNDATION MANUAL

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY

(W)

(A)

(kW)

(B.T.U./h)

(W)

(A)

(kW)

(B.T.U./h)

W

H

D

(kg)

DC INVERTER (WALL TYPE)

TYPE

MODEL

POWER SOURCE

TOTAL INPUT

TOTAL AMPERES

CAPACITY

TOTAL INPUT

TOTAL AMPERES

CAPACITY

DIMENSIONS (mm)

NET WEIGHT

SPECIFICATIONS

CONTENTS

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

HOW TO USE -------------------------------------------------------- 14

CONSTRUCTION AND DIMENSIONAL DIAGRAM ------- 38

MAIN PARTS COMPONENT ------------------------------------- 39

WIRING DIAGRAM -------------------------------------------------- 40

CIRCUIT DIAGRAM ------------------------------------------------- 43

PRINTED WIRING BOARD LOCATION DIAGRAM ------- 45

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

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

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

AUTO SWING FUNCTION ---------------------------------------- 65

DESCRIPTION OF MAIN CIRCUIT OPERATION --------- 66

SERVICE CALL Q & A -------------------------------------------- 71

PARTS LIST AND DIAGRAM ------------------------------------ 81

RAK-18NH6 RAK-25NH6 RAK-35NH6 RAK-50NH6

COOLING

HEATING

780

280

220

RAK-18NH6 RAK-25NH6 RAK-35NH6 RAK-50NH6

RAK-35NH6

1 PHASE, 50 Hz, 220-240V

REFER TO THE SPECIFICATION PAGE (6)

INDOOR UNIT

RAK-18NH6 RAK-25NH6

NOTE: This manual describes only points that differ from RAF-25, 35NH5, RAD-25, 35NH5, RAI-25, 35NH5 and RAM-55QH5 (PM No. 0312E) for items not described in this manual.

9.59.0

HITACHI

DC INVERTER

T

E

M

P

O

R

A

R

Y

S

W

IT

C

H

9.5 9.5

RAK-50NH6

– 1 –

SAFETY DURING REPAIR WORK

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

2. If it is necessary to replace any parts, they should be replaced with respective genuine parts for the unit, and the replacement must be 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 1M or more as measured by a 500V DC megger.

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

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

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

DANGER

First, I must disconnect the power cord plug

from the power outlet.

– 2 –

WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS

1. Scope The standards provide for items to be generally observed in carrying and handling semiconductors in 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).

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.

1M

Fig. 2. Body Earth

Body earth (Elimik conductive band)

Clip for connection with a grounding wire

IC

A conductive polyvinyl bag

IC

Conductive sponge

– 3 –

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

Bare copper wire (for body earth)

Working table

Resistor of 1 M (1/2W)

Earth wire

Fig. 3. Grounding of the working table

2

Screw stop at the screwed part using a rag plate

Soldering iron

Grounding wire

Fig. 4. Grounding a soldering iron

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

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

measuring instrument shortcircuit a load circuit or the like.

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

Staple

– 4 –

1. In quiet 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

– 5 –

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)

RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6

35W

NO

–

NO

YES

NO

YES(IC)

YES

----------

WITHOUT REFRIGERANT BECAUSE

COUPLING IS FLARE TYPE.

UNIT

PIPES

REFRIGERANT CHARGING VOLUME (Refrigerant 410A)

– 6 –

SPECIFICATION OF ROOM AIR CONDITIONER

RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6

RAM-55QH5

TYPE

MODEL

PHASE/VOLTAGE/FREQUENCY

COOLING

(ONE UNIT)

COOLING

(2 UNITS)

RAK-25NH5+RAK-35NH5

........RAM-55QH5

HEATING

(ONE UNIT)

HEATING

(2 UNITS)

RAK-25NH5+RAK-35NH5

........RAM-55QH5

AUTOMATIC AIR DEFLECTORS FAN SPEED

LINE CORD

REMOTE CONTROL SWITCH

MAXIMUM LENGTH OF PIPING

DIMENSIONS inches (mm)

NET WEIGHT (kg)

PACKING inches (mm)

GROSS WEIGHT (kg) FLARE NUT SIZE (SMALL/LARGE)

1.8 (1.00 - 2.50)

6,150 (3,415 - 8,536)

560 (200 - 750)

3.21

2.57 - 2.36 99 35

7.3

OUTDOOR UNIT

CAPACITY (kW) (BTU/h)

TOTAL INPUT (W) COP TOTAL AMPERE (A) POWER FACTOR (%) SOUND LEVEL (INDOOR) AIR FLOW VOLUME (Hi)

CAPACITY (kW) (BTU/h)

TOTAL INPUT (W) COP TOTAL AMPERE (A) POWER FACTOR (%) SOUND LEVEL (OUTDOOR)

CAPACITY (kW) (BTU/h)

TOTAL INPUT (W) COP TOTAL AMPERE (A) POWER FACTOR (%) SOUND LEVEL (INDOOR) AIR FLOW VOLUME (Hi)

CAPACITY (kW) (BTU/h)

TOTAL INPUT (W) COP TOTAL AMPERE (A) POWER FACTOR (%) SOUND LEVEL (OUTDOOR)

COOLING/HEATING

WALL TYPE

INDOOR UNIT RAK-18NH6

RAK-25NH6

RAK-35NH6

RAM-55QH5

1ø / 220V~240V / 50Hz

5.0 (0.9 - 5.2)

17,070 (3,070 - 17,740)

1,780 (155 - 2,200)

2.81

8.14 - 7.50 99 47

13.5

2.5 (1.00 - 3.10)

8,540 (3,415 - 10,585)

750 (200 - 880)

3.33

3.44 - 3.16 99 38

8.5

5.40 (1.50 - 5.90)

18,430 (5,120 - 20,130)

1,795 (200 - 1,980)

3.01

8.30 - 7.60 99 52

2.5 (1.10 - 3.20)

8,540 (3,756 - 10,927)

690 (200 - 970)

3.62

3.17 - 2.90 99 36

7.3

6.50 (0.9 - 8.1)

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

1,970 (155 - 2,100)

3.30

9.00 - 8.30 99

4.7

13.5

3.4 (1.10 - 4.40)

11,610 (3,756 - 15,024)

870 (200 - 1,120)

3.91

3.99 - 3.66 99 39

8.5

7.2 (1.50 - 7.20)

24,560 (5,120 - 24,560)

2,100 (200 - 2,100)

3.43

9.6 - 8.8 99 52

YES

4

YES

4

YES

4

NOT PROVIDED (POWER CORD SHOULD BE PREPARED AND CONNECTED TO

OUTDOOR UNIT WHEN INSTALLED)

YES (WIRELESS) YES (WIRELESS)YES (WIRELESS)

MAX 35m (TWO UNITS TOTAL)

W H D

(INSTALLED)

W H D

cu.ft

30-23/32 (780)

11-1/32 (280)

8-35/50 (220)

–

32-11/16 (830)

9-27/32 (250)

12-31/32 (330)

2.41 9

6.35/9.52

RAK-50NH6

3.5 (1.00 - 4.00)

11,950 (3,415 - 13,658)

1,090 (200 - 1,300)

3.21

5.00 - 4.59 99 41

10.1

4.2 (1.10 - 5.00)

14,340 (3,756 - 17,072)

1,080 (200 - 1,300)

3.89

4.96 - 4.55 99 41

10.1

YES (WIRELESS)

YES

4

HITACHI

DC INVERTER

TEMPORARY SWITCH

30-23/32 (780)

11-1/32 (280)

8-35/50 (220)

–

32-11/16 (830)

9-27/32 (250)

12-31/32 (330)

2.41 9

6.35/9.52

30-23/32 (780)

11-1/32 (280)

8-35/50 (220)

–

32-11/16 (830)

9-27/32 (250)

12-31/32 (330)

2.41 9

6.35/9.52

30-23/32 (780)

11-1/32 (280)

8-35/50 (220)

–

32-11/16 (830)

9-27/32 (250)

12-31/32 (330)

2.41 9

6.35/12.7

– 7 –

DUAL SYSTEM MULTI R.A.C.

RAM-55QH5

COOL / HEAT CAPACITY SPEC. FOR INDOOR UNITS COMBINATIONS TO BE ABLE TO OPERATE SIMULTANEOUSLY

Whichever indoor units are installed, cooling and heating capacity depends on how many and which indoor units are operating at that time.

POSSIBLE

COMBINATIONS

TO OPERATE

CAPACITY RATING

(kW)

(RANGE)

POWER

CONSUMPTION

(W)

AMPERE

(A)

220-240V

OUTDOOR UNIT

C O O L I N G

CAPACITY RATING

(kW)

(RANGE)

POWER

CONSUMPTION

(W)

AMPERE

(A)

220-240V

OUTDOOR UNIT

H E A T I N G

ONE UNIT

TWO UNIT

1.8

2.5

3.5

5.0

1.8+1.8

1.8+2.5

1.8+3.5

1.8+5.0

2.5+2.5

2.5+3.5

1.80

(1.00-2.50)

2.50

(1.00-2.80)

3.50

(1.00-3.90)

5.00

(1.00-5.60)

1.80+1.80

(1.50-4.00)

1.80+2.40

(1.50-4.60)

1.70+3.30

(1.50-5.60)

1.40+4.00

(1.50-5.90)

2.50+2.50

(1.50-5.60)

2.17+3.03

(1.50-5.70)

560

(200-750)

780

(200-980)

1160

(200-1280)

1780

(200-1960)

1190

(200-1300)

1310

(200-1450)

1650

(200-1820)

1795

(200-1980)

1650

(200-1820)

1730

(200-1900)

2.6-2.4

3.6-3.3

5.3-4.9

8.2-7.5

5.5-5.0

6.0-5.5

7.6-6.9

8.2-7.6

7.6-6.9

7.9-7.3

2.50

(1.10-3.20)

3.90

(1.10-4.70)

4.80

(1.10-5.80)

6.50

(1.10-7.20)

2.50+2.50

(1.50-5.20)

2.40+3.80

(1.50-6.30)

2.30+4.50

(1.50-7.20)

2.00+5.00

(1.50-7.20)

3.40+3.40

(1.50-7.20)

3.15+3.85

(1.50-7.20)

750

(200-1050)

1145

(200-1380)

1550

(200-1870)

2400

(200-2660)

1460

(200-1550)

1820

(200-1920)

1995

(200-2100)

2050

(200-2100)

2015

(200-2110)

2070

(200-2110)

3.4-3.2

5.3-4.8

7.1-6.5

11.0-10.1

6.7-6.1

8.4-7.7

9.2-8.4

9.4-8.6

9.3-8.5

9.5-8.7

ONE UNIT : The values indicated are only for one unit opration when two indoor units are connected.

3.5+3.5

2.70+2.70

(1.50-5.90)

1795

(200-1980)

8.2-7.6

3.60+3.60

(1.50-7.20)

2110

(200-2110)

9.7-8.9

2.5+5.0

1.80+3.60

(1.50-5.90)

1795

(200-1980)

8.2-7.6

2.70+4.50

(1.50-7.20)

2110

(200-2110)

9.7-8.9

RATING CONDITON (DRY BLUB / WET BULB)

COOLING

HEATING

INDOOR OUTDOOR

27 / 19 ˚C

20 / –˚C

35 / –˚C

7 / 6˚C

– 8 –

DUAL SYSTEM MULTI R.A.C.

RAM-55QH5

INDOOR UNITS COMBINATIONS TO BE ABLE TO INSTALL

Two indoor units can be installed with one outdoor unit. And total nominal cooling capacity should not be more than 7.5kW

INDOOR UNIT

MODEL

NOMINAL COOLING

CAPACITY

(kW)

CAPACITY (kW)

at one unit operation

SUITABLE ROOM SIZE (m2)

at one unit operation

COOLING HEATING COOLING HEATING

RAK-18NH5

RAK-25NH5

RAF-25NH5

RAD-25NH5

RAI-25NH5

RAK-35NH5

RAF-35NH5

RAD-35NH5

RAI-35NH5

1.8

2.5

3.5

1.00 - 2.50

1.00 - 2.80

1.00 - 3.90

1.10 - 3.20

1.10 - 4.70

1.10 - 5.80

8 - 12

11 - 17

16 - 24

9 - 11

14 - 18

17 - 22

Be sure to connect two indoor units to this outdoor unit. If not, condensed water may drop, resulting in trouble.

RAK-50NH5 5.0 1.00 - 5.60 1.10 - 7.20 23 - 34 23 - 29

RAF-50NH5 5.0 1.00 - 5.60 1.10 - 7.20 23 - 34 23 - 29

RAI-50NH5 5.0 1.00 - 5.60 1.10 - 7.20 23 - 34 23 - 29

– 9 –

DUAL SYSTEM MULTI R.A.C.

RAM-55QH5

CONNECTING POSISION TO BE ABLE TO INSTALL

POSSIBLE COMBINATIONS

TO INSTALL

(kW)

CONNECTING POSITION ON

OUTDOOR UNIT

(VALVE DIAMETER)

(mm)

No.1 No.2

SUITABLE ROOM SIZE

TO INSTALL

(m2)

6.35/9.52D 6.35/9.52D

TWO UNITS

1.8+1.8

1.8+2.5

1.8+3.5

1.8+5.0

2.5+2.5

2.5+3.5

(8-12) + (8-12)

(8-12) + (10-16)

(7-9) + (15-22)

(6-9) + (18-27)

(12-15) + (12-15)

(11-14) + (14-18)

1.8

2.5

1.8

2.5

3.5

5.0

2.5

3.5

2.5, 3.5, 4.0, 5.0 means indoor units cooling capacity class. (1) Marking

: needs flare adapter (9.52 12.7D): Part No. TA261D-4 001

(2) Suitable room size is determined based on the conditions below:

• Climate is in the temperate zone like Tokyo, Japan.

• For usual residential use.

• Smaller figure is for light construction which means light thermally sealed.

• Larger figure is for heavy constructions, which means well thermally sealed.

3.5+3.5 (13-16) + (13-16) 3.5 3.5

2.5+5.0 (10-12) + (18-20) 2.5 5.0



– 10 –

– 11 –

– 12 –

– 13 –

– 14 –

!

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

!

– 15 –

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 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.

●

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.

– 16 –

HITACHI

DC INVERTER

TEM

PORARY

SWITCH

HITACHI

INDOOR UNIT

NAMES AND FUNCTIONS OF EACH PART

Air filter

To prevent dust from coming into the indoor unit. (Refer page 31)

Front panel

Indoor unit indicators

Light indicator showing the operating condition. (Refer page 15)

Horizontal deflector

●

Vertical deflector

(Air Outlet)

(Refer page 26)

Remote controller

Send out operation signal to the indoor unit. So as to operate the whole unit. (Refer page 16)

WIDTH (mm)

780

MODEL

RAK-18NH6/RAK-25NH6/RAK-35NH6/RAK-50NH6

HEIGHT (mm)

280

DEPTH (mm)

220

MODEL NAME AND DIMENSIONS

– 17 –

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.

– 18 –

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.

– 19 –

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.

– 20 –

˚

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

– 21 –

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

– 22 –

˚

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

– 23 –

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

– 24 –

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

– 25 –

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

– 26 –

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

– 27 –

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

– 28 –

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 INVERTER

Vertical

about 15

about 60

about 45

about 30

When cooling, dehumidifying

When heating

– 29 –

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

– 30 –

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

– 31 –

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

– 32 –

HITACHI

DC INVERTER

T

E

M

P

O

R

A

R

Y

S

W

IT

C

H

HITACHI

D

C

IN

V

E

R

T

E

R

T

E

M

P

O

R

A

R

Y

S

W

IT

C

H

ATTACHING THE AIR CLEANSING AND DEODORIZING 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

Attaching the air cleansing and deodorizing filters to the filter.

● Attach the air cleansing and deodorizing filters to

the frame by gently compress its both sides and release after insertion into filter frame.

4

Attach the filters.

● Attach the filters by ensuring that the surface written

“FRONT” is facing front.

● After attaching the filters, push the front panel at

three arrow portion as shown in figure and close it.

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

CAUTION

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

NOTE

● In case of removing the air cleansing and deodorizing filters, please follow the above procedures.

● The cooling capacity is slightly weakened and the cooling speed becomes slower when the air cleansing

and deodorizing filters are used. So, set the fan speed to "HIGH" when using it in this condition.

● Air cleansing and deodorizing 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.

!

– 33 –

MAINTENANCE

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

1. AIR FILTER

Clean the air filter, as it removes dust inside the room. In case the air filter is full of dust, the air flow will decrease and the cooling capacity will be reduced. Further, noise may occur. Be sure to clean the filter following the procedure below.

!

CAUTION

1

Open the front panel and remove the filter

● Gently lift and remove the air cleansing and

deodorizing filter from the air filter frame.

2

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

3

● Re-insert the air cleansing and deodorizing

filter to the filter frame. Set the filter with “FRONT” mark facing front, and slot them into the original state.

● After attaching the filters, push the front panel

at three arrow portions as shown in figure and close it.

!

CAUTION

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

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

the sun. The filter may shrink.

● Do not use detergent on the air cleansing and deodorizing filter as some detergent may deteriorate

the filter electrostatic performance.

PROCEDURE

NOTE:

● Air cleansing and deodorizing 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.

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

– 34 –

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 INVER

TER

Projection

Flange

Hole

– 35 –

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

– 36 –

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

– 37 –

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

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

Cooling Heating

– 38 –

MODEL RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6

47

5

60

205

220

– 39 –

MAIN PARTS COMPONENT

THERMOSTAT

Thermostat Specifications

FAN MOTOR

Fan Motor Specifications

CONNECTION

TEMPERATURE °C (°F)

INDICATION

16

INDICATION

24

INDICATION

32

MODEL RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6

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)

MODEL

RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6

POWER SOURCE DC: 5V, 35V

OUTPUT 25W

(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

M

RED

BLK

WHT

YEL

BLU

35V

5V

0V

0 ~ 5V

FG

– 40 –

WIRING DIAGRAM

MODEL RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6

INDOOR UNIT

Remote Control

CIRCUIT DIAGRAM

– 41 –

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

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

CIRCUIT DIAGRAM

MODEL RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6

– 43 –

– 45 –

RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6

PRINTED WIRING BOARD LOCATION DIAGRAM

– 46 –

MODEL RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6

RECEIVING P.W.B.

MARKING ON P.W.B.

– 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

Outdoor microcomputer / HIC (AX-6M01)

Trip signal synthesis circuit

L

N

RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6

SPM2

Outdoor unit Terminal board

Indoor microcomputer (AX-7R11)

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

Indoor microcomputer (AX-7R11)

Indoor 2/Outdoor interface circuit

Indoor 1/Outdoor interface circuit

C2

D2

C1

D1

INDOOR UNIT 1

INDOOR UNIT 2

– 49 –

51

59

Combination of operations:

When operation mode is selected:

 You cannot operate the indoor units in the following combinations.  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.

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.

One unit

Heating

Other unit

Cooling

Dehumidifying

Circulating (fan)

Notes:

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

2. The speed set of rotation for the fan motor in each operation mode are as shown in Table 1.

3. The set room temperatures in the diagram include the shift values in Table 2.

– 51 –

PROM NO.

LABEL NAME

MODEL RAK-18NH6 RAK-35NH6RAK-25NH6

REQUIRED VALUE

OF UNIT SIDE

REQUIRED VALUE

OF UNIT SIDE

REQUIRED VALUE

OF UNIT SIDE

0A2 RTOTSA 0°C0°C0°C0°C 120 WMAX_M 5300 min-1 5300 5000 min-1 5000 min-1 121 WMAX2_M 5300 min-1 5300 5000 min-1 5000 min-1 122 WSTD_M 4000 min-1 4000 4000 min-1 4000 min-1 123 WJKMAX_M 3700 min-1 3700 3700 min-1 3700 min-1 124 WBEMAX_M 3500 min-1 3500 3500 min-1 3500 min-1 127 CMAX_M 3300 min-1 3300 min-1 4300 min-1 4300 min-1 128 CMAX2_M 3300 min-1 3300 min-1 3700 min-1 3700 min-1 129 CSTD_M 3250 min-1 3250 min-1 3150 min-1 3150 min-1 12A CKYMAX_M 2800 min-1 2800 min-1 2800 min-1 2800 min-1 12B CJKMAX_M 2750 min-1 2750 min-1 2750 min-1 2750 min-1 12C CBEMAX_M 2500 min-1 2500 min-1 2500 min-1 2500 min-1 12F SDMAX_M 2400 min-1 2400 min-1 1550 min-1 1550 min-1 130 SDRPM_M 2100 min-1 2100 min-1 1400 min-1 1400 min-1 138 WMIN_M 800 min-1 800 min-1 800 min-1 800 min-1 139 CMINHI_M 800 min-1 800 min-1 800 min-1 800 min-1 13A CMIN_M 1200 min-1 1200 min-1 1200 min-1 1200 min-1 13B DMIN_M 1200 min-1 1200 min-1 1200 min-1 1200 min-1 13C PKOU_M 550 min-1 550 min-1 550 min-1 550 min-1 13D FZZY_GN_M 1.5 1.5 1.5 1.5 13E FZZYTM_M 4 min 4 min 4 min 4 min 144 SHIFTW_M 2 °C2°C2°C2°C 145 SFTSZW_M 2 °C2°C2°C2°C 146 SHIFTC_M 1.33 °C 1.33 °C 1.33 °C 1.33 °C 147 SHIFTD_M 3.33 °C 3.33 °C 3.33 °C 3.33 °C 148 CLMXTP_M 30 °C30°C30°C30°C 149 YNEOF_M 25 °C25°C25°C25°C 14E TEION_M 2 °C2°C2°C2°C 14F TEIOF_M 9 °C9°C–°C–°C 157 CMNLMT_M 0 min-1 0 min-1 0 min-1 0 min-1 178 FWSS_M 500 min-1 500 min-1 500 min-1 500 min-1 179 FWSOY_M 600 min-1 600 min-1 700 min-1 700 min-1 17A FWS_M 720 min-1 750 min-1 820 min-1 820 min-1 17B FWKAF_M 840 min-1 850 min-1 920 min-1 920 min-1 17C FWL_M 840 min-1 850 min-1 920 min-1 920 min-1 17D FWAH_M 940 min-1 1050 min-1 1120 min-1 1120 min-1 17E FWH_M 940 min-1 1050 min-1 1120 min-1 1120 min-1 17F FWHH_M 1030 min-1 1170 min-1 1250 min-1 1250 min-1 180 FCSOY_M 550 min-1 600 min-1 680 min-1 680 min-1 181 FCS_M 650 min-1 750 min-1 780 min-1 780 min-1 182 FCL_M 740 min-1 870 min-1 950 min-1 950 min-1 183 FCAH_M 850 min-1 980 min-1 1030 min-1 1030 min-1 184 FCH_M 890 min-1 1030 min-1 1170 min-1 1170 min-1 185 FCHH_M 990 min-1 1030 min-1 1200 min-1 1200 min-1 186 FDOY_M 600 min-1 600 min-1 680 min-1 680 min-1 187 FDS1_M 720 min-1 750 min-1 780 min-1 780 min-1 188 FDS2_M 720 min-1 750 min-1 780 min-1 780 min-1

Ultra Lo FWSS_M

Sleep FWSOY_M

Lo FWS_M

Overload FWKAF_M

Med FWL_M Hi Set fan speed “AUTO” FWAH_M Hi Set fan speed “Hi” FWH_M

Ultra Hi FWHH_M

Sleep FCSOY_M

Lo FCS_M

Med FCL_M Hi Set fan speed “AUTO” FCAH_M Hi Set fan speed “Hi” FCH_M

Ultra Hi FCHH_M

Sleep FDOY_M

Lo 1 FDS1_M

Lo 2 FDS2_M

Table 1 Fan speed by mode

Operation

mode

Fan speed mode Label name

Heating

operation

Cooling

operation

Dehumidifying

operation

Table 2 Room temperature shift value

Operation mode Shift value

Heating operation

Fan speed “AUTO, Hi, Med” SHIFTW_M

Fan speed “Lo, Sleep” SFTSZW_M

Cooling operation SHIFTC_M

Dehumidifying operation SHIFTD_M

RAK-50NH6

REQUIRED VALUE

OF UNIT SIDE

– 53 –

– 55 –

– 57 –

Dehumidifying

Dehumidifying Sleep Operation

– 59 –

4

– 61 –

– 63 –

REFRIGERATING CYCLE DIAGRAM

RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6

– 64 –

REFRIGERATING CYCLE DIAGRAM

RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6

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

– 65 –

RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6

– 66 –

RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6

– 67 –

– 68 –

– 69 –

– 70 –

– 71 –

MODEL RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6

– 72 –

– 73 –

– 74 –

RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6

– 75 –

– 76 –

2

– 77 –

5

– 78 –

– 79 –

RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6

– 80 –

– 81 –

PARTS LIST AND DIAGRAM

INDOOR UNIT

MODEL: RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6

– 82 –

MODEL RAK-18NH6

1 PMRAS-25YH4 901 1 CABINET

4 PMRAS-25YH4 904 1 FAN MOTOR

6 PMRAS-260GA 001 1 TANGENTIAL AIR FLOW FAN

7 PMRAS-25YH4 908 1 FAN SUPPORT ASSEMBLY

8 PMRAS-25YH4 909 1 FAN COVER

9 PMRAS-25YH4 910 1 FAN MOTOR SUPPORT

10 PMRAS-07GH4 002 1 CYCLE ASSY

13 PMRAS-25YH4 914 1 UPPER COVER

14 PMRAS-25YH4 915 1 SPRING

16 PMRAS-25YH4 917 1 TERMINAL BOARD (2P)

18 PMRAS-260GHA 001 1 THERMISTOR ASSEMBLY

20 PMRAK-18NH6 001 1 P.W.B (MAIN)

21 PMRAS-25YH4 922 1 P.W.B (RECEIVER)

25 PMRAS-25YH4 926 1 DRAIN PAN

28 PMRAS-25YH4 929 1 AUTO SWEEP MOTOR

32 PMRAK-18NH6 002 1 FRONT COVER ASSEMBLY

35 PMRAK-18NH6 003 1 FRONT PANEL

36 PMRAK-18NH6 004 1 AIR FILTER (R)

37 PMRAK-18NH6 005 1 AIR FILTER (L)

38 PMRAS-25YH4 939 1 LOWER COVER

39 PMRAS-25YH4 940 1 MOUNTING PLATE

40 PMRAS-10C3M 003 1 REMOTE CONTROL SUPPORT

42 PMRAS-51CHA1 011 1 REMOTE CONTROL ASSEMBLY

PART N0.

RAK-18NH6

NO.

Q’TY / UNIT

PARTS NAME

– 83 –

MODEL RAK-25NH6

1 PMRAS-25YH4 901 1 CABINET

4 PMRAS-25YH4 904 1 FAN MOTOR

6 PMRAS-260GA 001 1 TANGENTIAL AIR FLOW FAN

7 PMRAS-25YH4 908 1 FAN SUPPORT ASSEMBLY

8 PMRAS-25YH4 909 1 FAN COVER

9 PMRAS-25YH4 910 1 FAN MOTOR SUPPORT

10 PMRAK-25NH5 002 1 CYCLE ASSY

13 PMRAS-25YH4 914 1 UPPER COVER

14 PMRAS-25YH4 915 1 SPRING

16 PMRAS-25YH4 917 1 TERMINAL BOARD (2P)

18 PMRAS-260GHA 001 1 THERMISTOR ASSEMBLY

20 PMRAK-25NH6 001 1 P.W.B (MAIN)

21 PMRAS-25YH4 922 1 P.W.B (RECEIVER)

25 PMRAS-25YH4 926 1 DRAIN PAN

28 PMRAS-25YH4 929 1 AUTO SWEEP MOTOR

32 PMRAK-18NH6 002 1 FRONT COVER ASSEMBLY

35 PMRAK-18NH6 003 1 FRONT PANEL

36 PMRAK-18NH6 004 1 AIR FILTER (R)

37 PMRAK-18NH6 005 1 AIR FILTER (L)

38 PMRAS-25YH4 939 1 LOWER COVER

39 PMRAS-25YH4 940 1 MOUNTING PLATE

40 PMRAS-10C3M 003 1 REMOTE CONTROL SUPPORT

42 PMRAS-51CHA1 011 1 REMOTE CONTROL ASSEMBLY

PART N0.

RAK-25NH6

NO.

Q’TY / UNIT

PARTS NAME

– 84 –

MODEL RAK-35NH6

1 PMRAS-25YH4 901 1 CABINET

4 PMRAS-25YH4 904 1 FAN MOTOR

6 PMRAS-260GA 001 1 TANGENTIAL AIR FLOW FAN

7 PMRAS-25YH4 908 1 FAN SUPPORT ASSEMBLY

8 PMRAS-25YH4 909 1 FAN COVER

9 PMRAS-25YH4 910 1 FAN MOTOR SUPPORT

10 PMRAK-25NH5 002 1 CYCLE ASSY

13 PMRAS-25YH4 914 1 UPPER COVER

14 PMRAS-25YH4 915 1 SPRING

16 PMRAS-25YH4 917 1 TERMINAL BOARD (2P)

18 PMRAS-260GHA 001 1 THERMISTOR ASSEMBLY

20 PMRAK-35NH6 001 1 P.W.B (MAIN)

21 PMRAS-25YH4 922 1 P.W.B (RECEIVER)

25 PMRAS-25YH4 926 1 DRAIN PAN

28 PMRAS-25YH4 929 1 AUTO SWEEP MOTOR

32 PMRAK-18NH6 002 1 FRONT COVER ASSEMBLY

35 PMRAK-18NH6 003 1 FRONT PANEL

36 PMRAK-18NH6 004 1 AIR FILTER (R)

37 PMRAK-18NH6 005 1 AIR FILTER (L)

38 PMRAS-25YH4 939 1 LOWER COVER

39 PMRAS-25YH4 940 1 MOUNTING PLATE

40 PMRAS-10C3M 003 1 REMOTE CONTROL SUPPORT

42 PMRAS-51CHA1 011 1 REMOTE CONTROL ASSEMBLY

PART N0.

RAK-35NH6

NO.

Q’TY / UNIT

PARTS NAME

– 85 –

MODEL RAK-50NH6

1 PMRAS-25YH4 901 1 CABINET

4 PMRAS-25YH4 904 1 FAN MOTOR

6 PMRAS-260GA 001 1 TANGENTIAL AIR FLOW FAN

7 PMRAS-25YH4 908 1 FAN SUPPORT ASSEMBLY

8 PMRAS-25YH4 909 1 FAN COVER

9 PMRAS-25YH4 910 1 FAN MOTOR SUPPORT

10 PMRAK-25NH5 002 1 CYCLE ASSY

13 PMRAS-25YH4 914 1 UPPER COVER

14 PMRAS-25YH4 915 1 SPRING

16 PMRAS-25YH4 917 1 TERMINAL BOARD (2P)

18 PMRAS-260GHA 001 1 THERMISTOR ASSEMBLY

20 PMRAK-50NH6 001 1 P.W.B (MAIN)

21 PMRAS-25YH4 922 1 P.W.B (RECEIVER)

25 PMRAS-25YH4 926 1 DRAIN PAN

28 PMRAS-25YH4 929 1 AUTO SWEEP MOTOR

32 PMRAK-18NH6 002 1 FRONT COVER ASSEMBLY

35 PMRAK-18NH6 003 1 FRONT PANEL

36 PMRAK-18NH6 004 1 AIR FILTER (R)

37 PMRAK-18NH6 005 1 AIR FILTER (L)

38 PMRAS-25YH4 939 1 LOWER COVER

39 PMRAS-25YH4 940 1 MOUNTING PLATE

40 PMRAS-10C3M 003 1 REMOTE CONTROL SUPPORT

42 PMRAS-51CHA1 011 1 REMOTE CONTROL ASSEMBLY

PART N0.

RAK-50NH6

NO.

Q’TY / UNIT

PARTS NAME

HITACHI

PM NO. 0355E

Printed in Malaysia

RAK-18NH6 RAK-25NH6 RAK-35NH6 RAK-50NH6

Hitachi RAK-18NH6, RAK-35NH6, RAK-25NH6, RAK-50NH6 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual