Hitachi RAS18CH1, RAC18CH1, RAS24CH2, RAC24CH2 Service manual

SERVICE MANUAL MANUEL D'ENTRETIEN WARTUNGSHANDBUCH

CAUTION:

Before servicing this chassis, it is important that the service technician read the “Safety Precautions” and “Product Safety Notices” in this service manual.

SM0162

«MODEL NAMES»

RAS18CH1 / RAC18CH1 RAS24CH2 / RAC24CH2

Data contained within this Service manual is subject to alteration for improvement.

ATTENTION:

Avant d’effectuer l’entretien du châassis, le technicien doit lire les «Précautions de sécurité» et les «Notices de sécurité du produit» présentés dans le présent manuel.

VORSICHT:

Vor Öffnen des Gehäuses hat der Service-Ingenieur die „Sicherheitshinweise“ und „Hinweise zur Produktsicherheit“ in diesem Wartungshandbuch zu lesen.

SERVICE MANUAL WITH

INSTALLATION GUIDE

Les données fournies dans le présent manuel d’entretien peuvent faire l’objet de modifications en vue de perfectionner le produit.

Die in diesem Wartungshandbuch enthaltenen Spezifikationen können sich zwecks Verbesserungen ändern.

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

Room Air Conditioner

December 2002

SERVICE MANUAL

TECHNICAL INFORMATION

SM0162

RAS18CH1 / RAC18CH1 RAS24CH2 / RAC24CH2

REFER TO THE INSTALLATION

FOR SERVICE PERSONNEL ONLY

RAS-18CH1 RAS-24CH2

RAC-18CH1 RAC-24CH2

MANUAL AND USERS GUIDE

CONTENTS

SPECIFICATIONS --------------------------------------------------- 5 INSTALLATION DIAGRAM -----------------------------------------7 CONSTRUCTION AND DIMENSIONAL DIAGRAM ------8 MAIN PARTS COMPONENT ------------------------------------10 WIRING DIAGRAM --------------------------------------------------12 CIRCUIT DIAGRAM-------------------------------------------------14 PRINTED WIRING BOARD LOCATION DIAGRAM-----15 BLOCK DIAGRAM ---------------------------------------------------16 BASIC MODE ---------------------------------------------------------17 REFRIGERATING CYCLE DIAGRAM ------------------------20 DESCRIPTION OF MAIN CIRCUIT OPERATION -------22 AUTO SWING FUNCTION---------------------------------------26 SERVICE CALL Q & A --------------------------------------------27 TROUBLE SHOOTING --------------------------------------------33 PART LISTS AND ASSEMBLY DIAGRAMS ---------------36

SPECIFICATIONS

TYPE

MODEL POWER SOURCE

TOTAL INPUT

COOLING

HEATING

DIMENSIONS (mm)

NET WEIGHT

TOTAL AMPERES

CAPACITY

TOTAL INPUT TOTAL AMPERES

CAPACITY

(W)

(A)

(kW)

(B.T.U./h)

(W)

(A)

(kW)

(B.T.U./h)

W

H D

(kg)

INDOOR UNIT OUTDOOR UNITINDOOR UNITOUTDOOR UNIT

RAS-18CH1 RAC-18CH1

1 Ø, 50 Hz, 220 - 230V

1680 - 1730

7.8 - 7.7

5.10

17,410

1680 - 1730

7.8 - 7.7

5.7

19,450

1030

295 183

12

(WALL TYPE)

RAS-24CH2 RAC-24CH2

850 650 298

60

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

1 Ø, 50 Hz, 220 - 230V

2180 - 2200

10.4 - 10.1

6.0

20,490

2350 - 2380

11.1 - 10.8

7.0

23,890

1030

295 183

12

After installation

850 650 298

60

ROOM AIR CONDITIONER

DECEMBER 2002

Refrigeration & Air-Conditioning Division

INDOOR UNIT + OUTDOOR UNIT

SAFETY DURING REPAIR WORK

1. 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 should absolutely be prohibited.

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

7. After repair, be careful to prevent the occurence of any accident such as electrical shock, leakage of current, or bodily injury due to the dropping 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-tester.

9. Check the initial location of installation. If it is found not strong enough or unsafe, the initial location should be reinforced or the unit should be

reinstalled at a new location.

10. Inflammable materials should never be placed near 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 ground terminal to earth.

– 1 –

WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS

1. Scope The standards provide for carrying and handling semiconductors during maintenance and handing. (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) PCBs 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. (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 person handling must always

earth himself. (Earth yourself by passing 1M 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

used. (4) Be sure to place a part on a metal plate with grounding. (5) Turn off power when repairing a PCB.

Repair the PCB 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

– 2 –

(6) Use a 3-wire type soldering iron that includs 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 during maintenance or inspection, make sure the test probes of the

measuring instrument short-circuit a load circuit.

or higher) when ordinary iron is to be used.

– 3 –

CAUTION

!

1. In quiet or stopping operation, slight flowing noise of refrigerant in the refrigerating cycle may be heard, this noise is normal for the operation.

2. During Thunderstorms, it is recommended to stop the operation and to disconnect the power cord plug from the power outlet.

3. The room air conditioner does not start automatically after recovery from power failure to prevent the fuse from blowing. Press the START/STOP button after 3 minutes after the unit has stopped.

4. When the room air conditioner is stopped by the thermostat or after miss-operation, the cooling and heating operation may not start for 3 minutes. This is not abnormal and is the result of the operation of IC delay circuit. The 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 for cooling operation when the outside temperature is below 10°C (50°F).

6. This room air conditioner (the reverse cycle) should not be used when the outside temperature is below –10°C (14°F). If the reverse cycle is used under this condition the outside heat exchanger may become frosted and efficiency will fall.

7. When the outside heat exchanger is frosted, the frost is melted by operating the hot gas system. In this condition the fan will stop and the vapour may rise from the outside heat exchanger.

– 4 –

SPECIFICATIONS

MODEL

FAN MOTOR

FAN MOTOR CAPACITOR

FAN MOTOR PROTECTOR

COMPRESSOR

COMPRESSOR MOTOR CAPACITOR

OVERLOAD PROTECTOR

OVERHEAT PROTECTOR

FUSE (MICRO COMPUTER CIRCUIT)

POWER RELAY

POWER SWITCH

RAS-18CH1

40W

NO

–

NO

3.15A

G4A

YES

RAC-18CH1

40W

2.5 F,450V

YES (INTERNAL)

SHX33SC4-U

50 F, 400VAC

YES (INTERNAL)

NO

TEMPORARY SWITCH

SERVICE SWITCH

TRANSFORMER

VARISTOR

NOISE SUPPRESSOR

THERMOSTAT

REMOTE CONTROL SWITCH (LIQUID CRYSTAL)

FUSE CAPACITY

UNIT

REFRIGERANT CHARGING VOLUME (Refrigerant R22)

PIPES (MAX. 15m)

PIPES (MIN. 5m)

NO

YES

NO

450NR

NO

YES(IC)

YES

20A TIME DELAY FUSE

---------- ❈ 1400g

ADDITIONAL REFRIGERANT R22 AT 25g PER METRE IF PIPE LENGTH IS MORE THAN 8m

NO

YES

NO

YES(IC)

NO

– 5 –

SPECIFICATIONS

MODEL

FAN MOTOR

FAN MOTOR CAPACITOR

FAN MOTOR PROTECTOR

COMPRESSOR

COMPRESSOR MOTOR CAPACITOR

OVERLOAD PROTECTOR

OVERHEAT PROTECTOR

FUSE (MICRO COMPUTER CIRCUIT)

POWER RELAY

POWER SWITCH

RAS-24CH2

40W

NO

–

NO

3.15A

G4A

YES

RAC-24CH2

40W

2.5 F,450V

YES (INTERNAL)

LH938SA1

75 F, 400VAC

YES (INTERNAL)

NO

TEMPORARY SWITCH

SERVICE SWITCH

TRANSFORMER

VARISTOR

NOISE SUPPRESSOR

THERMOSTAT

REMOTE CONTROL SWITCH (LIQUID CRYSTAL)

FUSE CAPACITY

REFRIGERANT CHARGING VOLUME (Refrigerant R22)

PIPES (MAX. 15m)

PIPES (MIN. 5m)

NO

YES

NO

450NR

NO

YES(IC)

YES

30A TIME DELAY FUSE

---------- ❈ 1720gUNIT

ADDITIONAL REFRIGERANT R22 AT 30g PER METRE IF PIPE LENGTH IS MORE THAN 8m

NO

YES(IC)

NO

– 6 –

Figure showing the installation of Indoor anf Outdoor unit

!

CAUTION

The installation height of indoor unit must be 2.5m or more in a non-public area

above 50mm

above 100mm

above

0.45m

2,500mm or more

above 300mm

must not bend

above 100mm

above 700mm

above 200mm

above 50mm when installed on the

(

ceiling of balcony

)

Plug

Maximum pipe length 15m

Minimum pipe length 5m

above 100mm

give clearance as wide as possible

above 200mm

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

The difference in height between the indoor and outdoor unit should be kept max 5m. The connecting pipe, no matter big or small, should all be insulated with insulation pipe and then warapped with vinyl tape. (The insulator will deteriorate if it is not wrapped with tape).

The connection of insulated drain hose.

inner diameter ø 16mm

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

– 7 –

CONSTRUCTION AND DIMENSIONAL DIAGRAM

MODEL RAS-18CH1/RAS-24CH2

1019

About

380

350

About

View from back

(Pipe lead-out)

6.5 60

201 183

47

Horizontal deflectorDischarge grille

47

31 120.5

60 60

263 317450

158

Drain hose

1030

Drain

47

Top air suction grille

Vertical deflector

P

7070

Front cover

295

147

56 17.5

28

47

When piping is drawn horizontally, exchange the drain hose for the drain cap

6.5 60

Drain outlet

Hole on the wall for ø 65mm pipe

Power cord Connecting cable

Drain cap connection port

Narrow pipe

Wide pipe

Note:

1. Servicing space of 100mm or more is required on the left and right sides of the indoor unit and also 50mm or

more space is required above the unit

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

3. Piping length is within 15m

4. Height different of the piping between the indoor unit and the outdoor unit should be within 5m.

5. Power supply cord length is about 2m

6. Connecting cable 2.5mm dia. x 3 (AB Line), 1.6mm dia. x 2 (CD Line) is used for the connection.

Line cord

L N

Indoor Unit

DCBA

Connecting Cord

ø1.6 or ø2.0

Outdoor Unit

RED

D

BRN

C

WHT

B

BLK

A

– 8 –

ø2.0

MODEL RAC-18CH1 / RAC-24CH2

26 850 79

10464

340

2022 298

Handle

Fixing hole

Air suction grille

Holes for anchor bolt (2-ø12)

507 198

Notch for anchor bolt (2-ø12 Notchs)

12 37

57

Air outlet

10

1010

320

340

More than

100

638

650

Service space

700

More than

100

More than

201

Handle

96

More than

100

169.5

Note:

1. 200mm or more servicing space is required above the outdoor unit.

– 9 –

MAIN PARTS COMPONENT

THERMOSTAT (Room Temperature Thermistor)

Thermostat Specifications

MODEL RAS-18CH1 / RAS-24CH2 THERMOSTAT MODEL IC OPERATION COOL HEAT

ON 17.6 (63.7) 19.6 (67.3) OFF 17.3 (63.1) 19.3 (66.7) ON 25.6 (78.1) 27.6 (81.7) OFF 25.3 (77.5) 27.3 (81.1) ON 33.6 (92.5) 35.6 (96.1) OFF 33.3 (91.9) 35.3 (95.5)

TEMPERATURE °C

INDICATION

16

INDICATION

24

INDICATION

32

FAN MOTOR

Fan Motor Specifications

MODEL RAS-18CH1, RAS-24CH2

PHASE RA TED VOL T AGE RA TED FREQUENCY OUTPUT

– – – – –

DC35V

– – – – –

40 W

RAC-18CH1, RAC-24CH2

SINGLE

220-240V

50 Hz

40 W

POLE NUMBER

CONNECTION

RESISTANCE VALUE

( )

20°C

75°C

35V

– – – – –

YELLOW

5V

– – – – –

RED

BLUE

M

INTERNAL THERMAL FUSE

BLACK

CAPACITOR

RM = 122.4

RA = 114.8

RM = 161.6

RA = 139.6

6

RED

RM

RA

GRAY

– 10 –

COMPRESSOR MOTOR

Compressor Motor Specifications

MODEL RAC-18CH1 RAC-24CH2 COMPRESSOR MODEL SHX33SC4-U LH938SA1

PHASE SINGLE RATED VOLTAGE 220 ~ 240 V RATED FREQUENCY 50 Hz LOCKED ROTOR CURRENT 45 A 45 A POLE NUMBER 2

WHITE

CONNECTION

RESISTANCE VALUE

(68°F)

( )

(167°F)

EXTERNAL OVERLOAD RELAY INTERNAL PROTECTOR

S (RED)

20°C

75°C

R (ORANGE)

ORANGE

RM = 1.47 RA = 2.88

RM = 1.79 RA = 3.50

NO

YES

CAPACITOR

S (RED)

RM

PROTECTOR

RA

RED

RM = 1.520

RA = 1.632

RM = 1.848

RA = 1.985

NO

YES

M OR R (ORANGE)

C (WHITE)

CAUTION

!

RAC-18CH1

C (WHITE)

RAC-24CH2

When the Air Conditioner has been operated for a long time with the capillary tubes clogged or crushed or with too little coolant, check the colour of the refrigerant oil inside the compressor. If the colour change is conspicuous, replace the compressor.

– 11 –

U

A

B

H

G

J

F

J

L

Y

T

S

Z

2

1

N

P

2

1

RV

3.15A

X

B

E

D

V

M

CK

R OR V

ORG

S OR X

C OR U

RED

GRY

BLK

BLU

WHT

BLU

B

C

D

A

BLU

CN4 WHT

B C D

A

BRN

RED

CONNECTING CORD

WHT BRN RED

BLK

GRN+YEL

CN13

CN15

CN16

CN14

SWITCHING POWER P.C.B.

GRN

43

C1C2M1M2

GRY

4 LINES

CN2

INDICATING

CN8B

CN10

RED YEL BLU

WHT

BLK

BLU BLU

M

1231234

1234

RED BLU

BRN

BLU

GRN+YEL

CN1

TEST

HA

CONTROL P.C.B.

1

2

3

4

WHT

IVOWHT

REMOTE

CONTROLLER

WHT

BRN

RED

P.C.B.

RECEIVER

7 LINES

IVO

CN11

CN2 IVO

BLK

CN3 BLK

BLK

WHT

CN12

RED

BLK

INDOOR UNIT

OUTDOOR UNIT

WIRING DIAGRAM

MODEL RAS-18CH1/RAC-18CH1

RAS-63CHA1/RAC-63CHA1

A : COMPRESSOR J :TERMINAL BOARD S : ROOM THERMISTOR B : FAN MOTOR K :LINE CORD T : HEX THERMISTOR

C : POWER SWITCH L : EXTERNAL FAN RELAY U : INTERNAL PROTECTOR D : THERMAL FUSE FOR 2P TERMINAL (102°C) M :STICK RELAY V : VARISTOR E : THERMAL FUSE FOR P.C.B. (96°C) N : NOISE FILTER X : FUSE F : REVERSING VALVE P :POWER RELAY Y : REVERSING VALVE RELAY G : 50 µF CAPACITOR R : SURGE ABSORBER Z : AUTO SWEEP MOTOR

H : 2.5 µF CAPACITOR

– 12 –

GRY : GRAY OR N : ORANGE GR N : GREEN RED : RED BLK : BLACK PNK : PINK VIO : VIOLET IVO : IVORY

BLU : BLUE YEL : YELLOW B R N : BROWN WHT : WHITE

U

A

B

H

G

J

F

J

L

Y

T

S

Z

2

1

N

P

2

1

RV

3.15A

X

B

E

D

V

M

CK

R OR V

ORG

S OR X

C OR U

RED

GRY

BLK

BLU

WHT

BLU

B

C

D

A

BLU

CN4 WHT

B C D

A

BRN

RED

CONNECTING CORD

WHT BRN RED

BLK

GRN+YEL

CN13

CN15

CN16

CN14

SWITCHING POWER P.C.B.

GRN

43

C1C2M1M2

GRY

4 LINES

CN2

INDICATING

CN8B

CN10

RED YEL BLU

WHT

BLK

BLU BLU

M

1231234

1234

RED BLU

BRN

BLU

GRN+YEL

CN1

TEST

HA

CONTROL P.C.B.

1

2

3

4

WHT

IVOWHT

REMOTE CONTROLLER

WHT

BRN

RED

P.C.B.

RECEIVER

7 LINES

IVO

CN11

CN2 IVO

BLK

CN3 BLK

BLK

WHT

CN12

RED

BLK

INDOOR UNIT

OUTDOOR UNIT

WIRING DIAGRAM

MODEL RAS-24CH2/RAC-24CH2

RAS-63CHA1/RAC-63CHA1

A : COMPRESSOR J :TERMINAL BOARD S : ROOM THERMISTOR B : FAN MOTOR K :LINE CORD T : HEX THERMISTOR

C : POWER SWITCH L : EXTERNAL FAN RELAY U : INTERNAL PROTECTOR D : THERMAL FUSE FOR 2P TERMINAL (102°C) M :STICK RELAY V : VARISTOR E : THERMAL FUSE FOR P.C.B. (96°C) N : NOISE FILTER X : FUSE F : REVERSING VALVE P :POWER RELAY Y : REVERSING VALVE RELAY G : 75 µF CAPACITOR R : SURGE ABSORBER Z : AUTO SWEEP MOTOR

H : 2.5 µF CAPACITOR BLU : BLUE YEL : YELLOW BRN : BROWN W HT : WHITE

GRY : GRAY OR N : ORANGE GR N : GREEN RED : RED

– 13 –

BLK : BLACK PNK : PINK VIO : VIOLET IVO : IVORY

CIRCUIT DIAGRAM

Remote Control

Key matrix table

1

SEG5

2

SEG0

3

SEG1

4

SEG2

5

SEG3 SEG4

6 7

SEG5

8

SEG6

9

SEG7

10

COM3

11

COM2

12

COM1

13

COM0

14

SEG14

15

SEG13

16

SEG12

17

SEG11

18

SEG13

19

SEG9

20

SEG8

D3

RB425D(1/2)

C8 50v/1u

LCD 1

K 1

K2K3

K4

K5

P10

P11

K6

K7 K8

K8 K10

K11K12

SEG20 SEG19

SEG18

SEG17 SEG16 SEG21 SEG24 SEG25 SEG26 SEG27 SEG28

P12

40 39 38 37 36 35 34 33 32 31 30 29

NC

28

NC

27

NC

26

NC

25

NC

24

NC

23

NC

22

NC NC

21

K13 K14

K15 K16

K17

K18

D0

D1

D2

D3

65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

64

SEG20 SEG21 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31 SEG32

SEG33 SEG34 SEG35

1

62

63

SEG19

SEG18

P41

P40

3

2

R1

100k

60

61

SEG17

SEG16

P42

P43

5

4

59

58

57

56

54

SEG14

SEG15

IC 1

SEG13

SEG12

55

SEG11

SEG10

SEG9

53

52

51

SEG8

SEG7

50

49

SEG5

SEG6

M3455OM6A-504FP

D2

P00

6

P01

7

P02

8

P03

9

P10

10

P11

11

P12

12

P13

13

D0

14

D1

15

16

48 47

SEG4

D3

D4

17 18

46

SEG2

SEG3

D5

19

45

44

SEG0

SEG1

D7

D6

20

21

SW1

SW-187-2P

Input

P10

P11

P12

43

42

SEG42

SEG43

D9

D8

22

23

Output

Door open

Door shut

Door open

Door shut –

Door open

Door shut

41

SEG41

SEG40

40

P30 P31

39

VL C2 VL C3 XC IN

XC OUT

VDD

VSS

X OUT

X IN

RESET

CARR

P23 P22

P21

P20

BEEP

24

38 37 36 35 34 33 32 31 30 29 28 27 26 25

R2

100k

NCVL C1

D0 D1

Start/Stop

Operation selection

Start/Stop Super silent cooling

On timer

Hour up

Room temperature up

Off timer –

Sleep –

D1 D2

EL-1L7

R6

R7

R3

100k

24(1/8W)

R5

330

P

R4

100k

Q1

2SC3443

or 2SC2982

D2D1

R8

R6 R9

R9

R10 12M

D2

Fan speed selection

–

Hour down

Room temperature down

Reservation

–

D3

RB425D

(1/2)

X1

K19

910kHz

C9

105

Automatic swing

•

Day

Super cooling

R11

150k

X2

32.768

kHz

C6

104

D3

–

present time

Cancel

–

R14 220k

R13

220K

104

C7

R15

100k

R16 100k

C1

334

C2

220p

C3

220p

C4 18p

C5 22p

– 14 –

R12

220k

PRINTED WIRING BOARD LOCATION DIAGRAM

MODEL RAS-18CH1/RAS-24CH2

SWITCHING POWER BOARD

1

200V

2W

2.2K

3

50V 220 F

CN15

(PH-4P)

WHITE

CN12

(VH-4P)

WHITE

GRAY

GRAY BLACK BLACK

CN16

(ZR-3P)

IVORY

TEST PIN

CN2

(ZR-4P)

CN2

(ZR-4P)

1 2 3

4

CN11

(ZR-7P)

5

CURRENT SELECTOR

TEMPORARY OPERATION

6 2 3 4

SW1

7 11

10A

3 1 3 1

4 3 2 1

1

2

3

1 2 3

4

5 6 3 2 4 7

200V

1A

250V

0.0022 F

JW1

0V

5V

0V

220 F 50V

800V 1A

R713

ZD701

2W 150

70V 0.15A

2W 150

70V

0.15A

+

-

12V

R714

2200pF 1KV

70V 0.15A

HZ5B1

50V

1/4W

0.5A

HZ7B1L

0.01 F

1/6W 3.5K

25V

1/6W 1K

120 F

R307 R304

IC301/IC302

(E2PROM)

134

R405

R404

0V

0.047 F

CN1

(XH-3P)

WHITE

CN4

THERM-FUSE FOR

(XH-3P)

WHITE

HEAT EXCHANGER THERMISTOR

RESISTANCE: 10K ohms ±3% (25 C) B-CONSTANT: 3950K ±2% (B25/50)

ROOM TEMPERATURE THERMISTOR

RESISTANCE: 10K ohms ±2% (25 C) B-CONSTANT: 3950K ±2% (B25/50)

INDICATION BOARD (H-BOARD)

FILTER LAMP

OPERATION LAMP

TIMER LAMP

RECEIVER BOARD (R-BOARD)

R621

R622

VOUT

C621

+

-

TEMPORARY OPERATION

15A 15A 10A

NORMAL NORMAL

V

DD

RECEIVER

UNIT

GND

CN10

(XH-2P)

WHITE

THERM-FUSE FOR 2PTERMINAL

LD723 LD721 LD725

(ZR-7P)

SERVICE SWITCH

L (BROWN) N (BLUE) E (GREEN&YELLOW)

1/4W 470K 1/4W 470K

3W 120

800V 3A

25V

0.7A

R303

R306

56827

C301

0V

R383

R381

5V

D401

0V

5V

C302

R361

+

-

R362

R382

POWER-SW 1

3

1

450V,2.2 F

3

5V

D301

D302

D304

D303

0V

Q301

0V

C381

C361

0V

12V

BZ1

B.Z

Q302

0V

CN8B

(VH-2P) WHITE

BLK

5V

D306

0V

R511R512

ZD511

0V

R801

2 4

D305

+

-

RESET

RED BLUE

GREEN

BRN

RED

5V

Q511

C511

R721 R725 R723

M-BOARD

NOISE FILTER1

+

C402

0V

R514

Q512

R513

R515

D904

0V

C403

0V

R206

C321

C212

L101

R930

R932

5V

C213

R906

R931

OSC1

R712

VARISTOR 1

SURGE ABSORBER

(D3SB60) DB201

35V

+

C101

5V

R302 R305 R313 R314 R315

R316

R331

R332

C401

R317

R509

C512

C710 R318

R319

R320 R321

C501

ICP1

2

10 11 12 13 14 15 16 17 18 19 20 21 22

23 24

R510

25 26 27 28 29 30 31 32

3.15A FUSE

NOISE FILTER2

VARISTOR 2

C203 C202

R100ZD100

+

-

C109

ICP2

VCC

1

P9 0

PWM O/P

P9 1

SDA

3

P9 2

SCL

4

P9 3

5

NO USE

P9 4

6

NO USE

P9 5

7

NO USE

P9 6

HEX. TEMP

8

RANGE SELECTION

P9 7

NO USE

9

AVCC

EEPROM SELECTION

AN0

ROOM TH.

AN1

HEX. TH.

AN2

FAST FEED

AN3

TEST INDICATION MODE

AN4

NO USE

AN5

PWM VOLTAGE FEEDBACK

AN6

INDOOR FAN OVER-CURRENT

AN7 AVSS

TEST

2X 1X

V

SS

1OSC 2OSC

RES

REMOCON I/P

IRQ

0

NO USE

1IRQ

SINGLE/MULTI

4IRQ

BUZZER

TM0E

CURRENT TRANS

6P1

HA O/P

7P4

C207 C206

C201 C200

C108 R101

R104

R911

R916

IC1

EEPROM

R205

C205

POWER SUPPLY

2

6 7

5

REG1

8

Q903

1 4

3

R913

ZD101

R914

R107R106

R109

FAN MOTOR DRIVER

Q904

R917

NO USE NO USE NO USE NO USE

LOUVER

CCW

HEATER

FAN HI

FAN LO (MED)

FAN

OUTPUT

FAN S (LOW)

REVERSING VALVE R.

OUTDOOR FAN RELAY

POWER RELAY STICK RELAY

ABNORMAL FAN CURRENT

AMAND

AUTO RESTART

REMOCON ID

NICE TEMP.

CANCEL

TEST INDICAT.

SELECTION

FORCED COOL

REMOCON SELECTION

HA I/P

COOL/DEHUM.

COMP. OPER.

DASH

FILTER/

POWERFUL

LED OUTPUT

TIMER OPERATION

DEHUMIDIFY

64

7P7

63

6P7

62

5P7

61

4P7

60

B

3P7

59

A

2P7

B

58

1P7

A

57

P70

56

P67

55

P66

54

P65

53

P64

52

P63

51

P62

50

P61

49

P60

48

P17

X2

47

P57

X1

46

P56

45

P55

44

P54

43

P53

42

P52

41

1P5

40

0P5

39

0P4

38

1P4

37

2P4

36

3P4

35

4P4

34

5P4

33

6P4

R105

C106R108

C105

POWER RELAY

43

STICK RELAY

L102

Q901

D102

5V

R601 R602

R603

R607

C601

R610

43

+

R102R103

C102

L901

D902

REMOCON ID

ID1

(A/B SELECTION)

R604

R605 R606

R608

R609

0V

ZD102

+

IC701

7 6 5

4 3 2 1

I

REG2

C104

C901

12V

9

8

0V

REVERSING VALVE RELAY

2

OUTDOOR FAN RELAY

O

+

-

C107

G

C103

5V

R919

C902

R920

D701

Q303

0V

10 11 12

REVERSING VALVE

13

OUTDOOR FAN RELAY

14

POWER RELAY

15

STICK RELAY

16

SERVICE SW

COOL

NORMAL

0V

3 32

12V

5V

0V

RED

YELLOW

BLUE

12V

5V

0V

WHITE BLACK

RED

1

BROWN

3

CN3

(VH-2P)

BLACK

CN13

(BNH-6P) WHITE

5 4 3 2 1

CN14

(XH-4P)

WHITE

C1

1

C2

2

M1

3

M2

4

RED

YELLOW

BLUE

M

STEPPING MOTOR

HA

TERMINAL BOARD

B A

D C

INDOOR DC FAN MOTOR

M

– 15 –

BLOCK DIAGRAM

MODEL RAS-18CH1/RAC-18CH1

RAS-24CH2/RAC-24CH2

– 16 –

INDOOR UNIT

POWER SUPPLY

WIRELESS REMOTE CONTROLLER

ROOM TEMPERATURE THERMISTOR

HEAT EXCHANGER THERMISTOR

DC FAN MOTOR OPERATION CIRCUIT

WIRELESS RECEIVING CIRCUIT

INITIALIZING

CIRCUIT

POWER RELAY STICK RELAY

INDOOR

FM

FAN MOTOR

BUZZER CIRCUIT

MICROCOMPUTER

OUTDOOR UNIT

M

F M

R V

RELAY

INDICATION LAMP

COMPRESSOR

OUTDOOR FAN MOTOR

REVERSING VALVE

POWER RELAY STICK RELAY REVERSING

VALVE RELAY EXTERNAL FAN

RELAY

OPERATION TIMER FILTER

RESET

CIRCUIT

(AX-3T2) (AX-3T3)

MICROCOMPUTER CLOCK CIRCUIT

AUTO SWEEP MOTOR

M