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

–

NO

NO

NO

3.15A

G4A

YES

RAC-18CH1

40W

2.5 F,450V

YES (INTERNAL)

SHX33SC4-U

50 F, 400VAC

YES (INTERNAL)

YES (INTERNAL)

NO

NO

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

NO

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

–

NO

NO

NO

3.15A

G4A

YES

RAC-24CH2

40W

2.5 F,450V

YES (INTERNAL)

LH938SA1

75 F, 400VAC

YES (INTERNAL)

YES (INTERNAL)

NO

NO

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

NO

NO

NO

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 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

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

RED

GRY

GRY

BLK

BLK

BLU

WHT

BLU

B

C

D

A

BLU

BLU

BLU

CN4
WHT

B
C
D

A

BRN

BRN

RED

RED

CONNECTING
CORD

WHT
BRN
RED

BLK

GRN+YEL

CN13

CN15

CN16

CN14

SWITCHING POWER P.C.B.

GRN

43

43

C1C2M1M2

GRY

GRY

4 LINES

CN2

INDICATING

CN8B

CN10

RED
YEL
BLU

RED
YEL
BLU

WHT

BLK

BLU
BLU

M

M

1231234

1234

RED
BLU

BRN

BLU

GRN+YEL

CN1

TEST

HA

CONTROL P.C.B.

1

2

3

4

WHT

WHT

IVOWHT

REMOTE

CONTROLLER

WHT

BRN

RED

P.C.B.

P.C.B.

RECEIVER

7 LINES

IVO

CN11

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

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

RED

GRY

GRY

BLK

BLK

BLU

WHT

BLU

B

C

D

A

BLU

BLU

BLU

CN4
WHT

B
C
D

A

BRN

BRN

RED

RED

CONNECTING
CORD

WHT
BRN
RED

BLK

GRN+YEL

CN13

CN15

CN16

CN14

SWITCHING POWER P.C.B.

GRN

43

43

C1C2M1M2

GRY

GRY

4 LINES

CN2

INDICATING

CN8B

CN10

RED
YEL
BLU

RED
YEL
BLU

WHT

BLK

BLU
BLU

M

M

1231234

1234

RED
BLU

BRN

BLU

GRN+YEL

CN1

TEST

HA

CONTROL P.C.B.

1

2

3

4

WHT

WHT

IVOWHT

REMOTE
CONTROLLER

WHT

BRN

RED

P.C.B.

P.C.B.

RECEIVER

7 LINES

IVO

CN11

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

CN11

(ZR-7P)

5

CURRENT
SELECTOR

TEMPORARY
OPERATION

6
2
3
4

SW1

7
11

10A

3
1
3
1

4
3
2
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

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

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

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

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

15 sec

30 sec

30 sec

15 sec

30 sec

30 sec

15 sec

30 sec

30 sec

+3
+2
+1

-1

-2

-3

-4

Set temperature

Start/stop switch
Fan relay H
Fan relay L
Fan relay S
Power relay
Stick relay
External fan relay
Reversing valve relay

Pilot lamp
Hot keep lamp

S

S

LHS

H

S

L

B

SL

S

L

H

2 sec

2 sec

2 sec

2 sec

30 sec

30 sec

H

BASIC MODE

(0.5)

(0.5) (0.5)

(0.5)

(0.5)

(0.5)

(0.5)

(0.5)

1 sec

1 sec

(1 sec)

Fan relay H
Power relay
Stick relay
External fan relay
Reversing fan relay

Timer relay

Indoor heat exchanger
thermistor temperature

T

1

Low-temperature input

T8
T9
T6

T7
T5
T3
T4

TEMPERATURE OF INDOOR HEAT

EXCHANGER THERMISTOR

PD CUT 1
PD CUT 2
PD CUT 3
FAN RELAY H
FAN RELAY L
POWER RELAY
STICK RELAY
EXTERNAL FAN RELAY
REVERSING VALVE RELAY

MODEL RAS-18CH1/RAC-18CH1//RAS-24CH2/RAC-24CH2

Operation mode

No.

Control function

Start/stop button,

1

basic mode

Timer

2

operation

OFF timer

ON timer

Fan Cooling Sensor dehumidification Heating Automatic

Start/stop button
Reservation
Cancel
Operation lamp
Timer lamp
Timer memory

Start/stop button
Reservation
Cancel
Operation lamp
Timer lamp
Timer memory

Start/stop button
Operation lamp

(OFF timer during stop) (Cancel)

(ON timer during operation)

(Cancel)

(Change of the reservation time)

(Change of the reservation time)

5

Circulation

3

mode

Thermostat operation
H

➞

HI

L

➞

MED

➞

LO

S

4

• The power relay is
delayed by 2 seconds
from the start of
thermostat operation.

OFF
timer

Automatic

HI

MED

LO

➞

➞

ON

Operation in the previous

•
circulation mode

Operation in “HI” mode

•

Operation in “MED” mode

•

Operation in “LO” mode

•
Only circulation

•
with cut velocity is
executed, independent
of the thermostat
signal.

(1) Strong

Start/stop button
Fan relay H

Stick relay

“HI”, “MED”, or “LO” operation is

•
executed according to the thermostat
signal. (Refer to “Thermostat operation”.)

Same as on the left.

•

Same as on the left.

•

Same as on the left.

•

(1) In case of “Automatic” mode

+3
+2

Set temperature

Start/stop button
Fan relay H
Fan relay L
Fan relay S
Power relay
Stick relay
External fan relay

Operation lamp

+1

-1

-2

-3

2 sec 2 sec2 sec

H S L S L H S

S L L

Note:

The min. ON time of the power relay

•
is 3 minutes, and the min. OFF time
also is 3 minutes.

(2) In other modes than “Automatic”

Same as above (but operation is
made with the velocity set at the
time of operation start).

Start/stop button
Reservation
Cancel
Operation lamp
Timer lamp
Timer memory

“LO” and “Stop” are repeated according to the thermostat

•

(OFF ON timer)

PM1:00 PM3:00 PM5:00

(ON OFF timer)

PM1:00 PM3:00 PM5:00 PM1:00 PM3:00 PM5:00 PM1:00 PM3:00 PM5:00

signal, independent of the setting.

(1) When the set temperature is lower than the room

temperature.

+3

(Set temperature) +
(Temperature shift amount)

Start/stop button
Fan relay S

Power relay
Stick relay

External fan relay

Operation lamp

The min. ON time of the power relay is 3 minutes, and the

•
min. OFF time also is 3 minutes.

+2
+1

-1

-2

-3

2 sec

30 sec

5 sec

5 sec

2 sec

2 sec

S S S

30 sec

• The indoor fan is not delayed with operation start by start/
stop button ON.

• The indoor fan is delayed by 5 sec with operation start
by thermostat operation.

(2) Set temperature is higher than room temperature.

Set temperature

0.66 deg

0.33 deg

Start/stop button
Fan Speed S

Power relay
Stick relay

External fan relay

Operation lamp

-1

-2

-3

-4

2 sec

2 sec

30 sec

5 sec

2 sec

30 sec

2 sec

Notes:

Forced operation by start/stop

•
button ON is executed even
with thermostat OFF.
The room temperature 30 sec

•
after operation start, minus

0.66 deg, becomes the set
temperature.

•

When the room temperature
is 16°C or lower, 16°C
becomes the set temperature.

•

The other operations are the
same as for (1).

(ON OFF timer during operation)

“HI”, “MED”, “LO”, and “Stop” are repeated according to the thermostat

•
signal and time.

“HI”, “MED”, “LO”, and “Stop” are repeated according to the thermostat

•
signal and time.

“MED”, “LO”, and “Stop” are repeated according to the thermostat signal

•
and time.

“LO” and “Stop” are repeated according to the thermostat signal and time.

•

Example for “HI” circulation mode

Air-blow mode (A) (B)

Automatic L

Notes:

The min. ON time of the power relay is 3 minutes, and the min. OFF time

•
also is 3 minutes.

•

In automatic circulation mode, “HI” in section (B) occurs only the first time.

(OFF ON timer during stop)

HL H

LL L

SS L

X

L

The “Automatic” speed mode

•
for each operation mode is used
independent of the setting.
(“Week” at the time of “Sensor
dehumidification”.)

The operation mode at the

•
start of operation differs as
shown below according to
the room temperature.

Cooling The set temperature

➞

operation

at the start of

➞

Room temperature

shall be 27°C.

Sensor The set temperature
dehumidi- shall be 2 degrees
fication below the room

temperature at the
start of operation.

Heating The set temperature

shall be 23°C +
temperature shift
amount.

• A shift is not accepted at the
time of operation start.

• There is no switching between
modes after start of operation.

• When the operation is started
again within 20 min. after
stop with the start/stop button,
operation will be executed in
the previous mode.

• The operation details are the
same as for each operation mode.

• The set temperature is set with
the room temperature
adjustment button. Correction
by V, ±3°C is possible with.
At this time, the operation mode
judgement temperature also is
shifted at the same time.
However, correction is possible
only in cooling operation mode,
but not in “Sensor dehumidifica­tion” mode.

Heating load reduction and Pd cut

AIR BLOW CHANGE TO "H" FORCILY WHEN ENTERING "PD CUT 2"
AIR BLOW CAN BE CHANGED BY REMOTE CONTROL AFTER TEMP. T
AIR BLOW RETURNS TO THE SET SPEED AT T

•

All relays are stopped by low-

.

5

.

7

temperature input.

•

Not accepted during hot keep,
during compressor stop, during
defrosting and during forced
3 minutes.

6

•

Accepted only during heating
operation.

•

Recovery at the time of stop by
low-temperature input is reset
recovery.

•

Reversing valve lock protection

The timer lamp flashes at the
time of stop.

– 17 –

Operation lamp

Timer lamp

Set

temperature

Start/stop switch

Sleep key

Operation lamp

Sleep key

Timer lamp

60 minutes

5 deg down

LO (sleep operation)

Set circulation

velocity

Start/stop switch
Thermostat signal
Preheating signal
Fan relay H
Fan relay L
Fan relay S
Power relay
Hot keep lamp

2 sec

30 sec 30 sec

15sec

30 sec 30 sec

"Strong" circulation

2 sec

15 sec

15 minutes-T

30 sec

30 sec

Completion

Defrosting
start

30 sec

30 sec

2 sec

10 sec

Start/stop switch
Defrosting signal
Preheating signal
Fan relay H
Fan relay L
Fan relay S
Power relay
Stick relay
External fan relay
Reversing valve relay
Heater relay

Operation lamp
Hot keep lamp

2 sec

10 sec

30 sec

60 sec

3 minutes

30 sec

60 sec

15 sec

Set circulation velocity

Set
temperature

Start/stop switch
Sleep key
Operation lamp
Timer lamp

60 minutes

2 deg up

LO (sleep operation)

No.

Control function

•

7

Preheating

8

operation

Defrosting

9

(including automatic
fresh defrosting).

Operation mode

The set temperature
after sleep shift in
sensor dehumidification
operation is limited
by 16°C.

Fan Cooling Sensor dehumidification Heating Automatic

Sleep operation is executed

•
for each operation mode.

Sleep operation is executed

•
for each operation mode.

At the time of heating

•
operation mode, the same
operation as for heating
is executed.

Defrosting of each operation

•
mode is executed.

The operation is

•
switched OFF
at the set time.

LO (sleep operation)

Set
temperature

Start/stop switch
Sleep key
Operation lamp
Timer lamp

Set circulation velocity

2 deg up

60 minutes

Notes:

60 minutes after the sleep key is switched on, sleep operation

•
is started.
When the sleep key is switched on during OFF timer operation,

•
the OFF timer will be canceled.

Indoor heat exchanger
thermistor temperature

T

1

Fan relay H

Power relay
Stick relay
Outside fan relay

Operation lamp

Cooling strong

Min. 3 minutes

Fan relay S

Power relay
Stick relay
Outside fan relay

Operation lamp

Sensor dehumidification

60 minutes

60 minutes

30 sec 30 sec

T

5 deg down

5 deg down

LO (sleep operation)

LO (sleep operation)

30 sec 30 sec

15sec

2 sec

3 minutes

Set

temperature
Start/stop switch
Sleep key
Operation lamp
Timer lamp

When the sleep key is switched on during OFF timer operation, the OFF timer will be cancelled.

•

Set
temperature

Start/stop switch
Sleep key
Operation lamp
Sleep key
Timer lamp

When the sleep key is switched on during ON after a timer reservation, sleep operation will be started.

•

"Strong" circulation

Start/stop switch
Thermostat signal
Preheating signal
Fan relay H
Fan relay L
Fan relay S
Power relay
Hot keep lamp

Set circulation
velocity

Set circulation
velocity

2 sec

Notes:

Even when the preheating signal is not given as input, heating operation is started when

•
3 minutes have passed for T.
Preheating operation is executed at the time of operation start and after completion

•
of defrosting, and at all other times, there is no operation, independent of the preheating signal.

Defrosting

Start/stop switch
Defrosting signal
Preheating signal
Fan relay H
Fan relay L
Fan relay S
Power relay
Stick relay
External fan relay
Reversing valve relay
Heater relay

Operation lamp
Hot keep lamp

2 sec

10 sec

(Reverse cycle defrosting)

TA

TB

(Silencing period)

TC

(Cycle balancing time)

TE

(Defrosting prohibition

time)

30 sec

30 sec

T

E

10 min.

+0

min.

-1

30 sec

30 sec

50 min.

+0

min.

-5

start

15 sec

T

A

30 sec

60 sec

For the time TE after start of heating operation, defrosting will not be

•
executed even when the defrosting signal is given as input.
When the reserve cycle defrosting TA has continued for the time

•
shown in the table on the left, the operation advances to TB and TC
independent of the defrosting signal.
When the power relay becomes ON after expiration of the time TE,

•
defrosting will be started immediately with input of the defrosting signal.
Once defrosting has been completed, the defrosting signal is not

•
accepted for the time TE.
When a defrosting signal has been given as input at the time of stop

•
by means of the start/stop switch or at the time of OFF timer count-up,
defrosting is executed before operation stop.
The defrosting signal is not accepted at the time of overload input.

•

T

B

Completion

30 sec

2 sec

10 sec

T

C

15 minutes-T

30 sec

E

15 sec

T

A

30 sec

60 sec

3 minutes

Table 1 Specifications

Item
Operation switching

Automatic
Heating

Fan
Sensor

Yes
Yes

Yes
Yes

dehumidification
Cooling

Temporary switch
Service switch

Heating

Cooling
Nice temperature reservation
Automatic fresh defrosting
Defrosting
Pd cut 1
Pd cut 2
Pd cut 3
Heating load reduction
External fan relay
Reversing valve relay
Reversing valve lock protection
Sleep circuit
Heater operation at the time of sensor

Yes

Yes (automatic)

NO
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes

No

dehumidification
Automatic blowing direction

Filter sign
Wireless mode

Yes
Yes

Cooling/Heating

Table 2 Sensor operation values

Item

Cooling, Sensor 16 17.6

ON temperature dehumidification 24 25.6
Thermostat (Thermostat relay) 32 33.6
operation power relay Heating 16 19.6

(°C) 24 27.6

32 35.6

Differential (°C) 0.33

–

–
Low-temperature (T1) ON (°C) 1.0
defrosting Reset (°C) 12.0
Preheating Reset (°C) 17.0

ON (°C) 15.0

–

–
Pd cut 1 (T3) ON (°C) 56.0

(T4) Reset (°C) 52.0

Pd cut 2 (T6) ON (°C) 66.0

(T7) Reset (°C) 57.0
(T5) Fan Relay H [ Original (°C) 58.0

Pd cut 3 (T8) ON (°C) 62.0

(T9) Reset (°C) 57.0

Other detailed specifications

1. When the room temperature rises
within 3 minutes after thermostat
OFF during cooling operation with
automatic velocity, the blowing
velocity changes in the order of S

➞ L ➞ H in the same way as at

the time of thermostat ON.

2. In case of Tele. control input during
stopped ON timer, operation will
be started at that time and the timer
will be cleared.

3. In case of Tele. control input during
operation of the OFF timer, the
operation will be stopped at that
time and the timer will be cleared.

4. Even when operation stop is
executed at the time of outside fan
OFF by overload, automatic fresh
defrosting will not be executed.

5. In case of switching to “Heating”
during “Automatic” heating
operation, the operation will be
continued as it is when the
thermostat is ON. 3 min delay will
not be entered. However, the set
room temperature and the blowing
velocity will be according to the
remote control signal. The same
applies for switching from “Heating”
to “Automatic” heating.

6. In case of switching from “Sensor
dehumidification” operation to
“Cooling”, as it is when the
thermostat is ON. 3 min delay will
not be entered. However, the set
room temperature and the blowing
velocity will be according to the
remote control signal.
The same applies for switching
from
“Cooling” to “Sensor dehumidifica­tion”. The same also applies for
“Automatic” sensor dehumidifica­tion, cooling “Sensor dehumidifica­tion”, “Cooling”.

7. The filter sign lights after operation
of the indoor fan for 100 hours.
The time is cleared when power
switch set to OFF and ON again.

8. After entry into trouble mode (when
the indication lamp is flashing), the
rapid feed mode can not be
changed.

9. When operation by nice
temperature reservation is
executed during sleep operation,
normal operation will be continued,
and the advance time becomes the
temperature difference between the
set temperature without sleep shift
and the room temperature.

10. The 50 minutes of defrosting
prohibition are counted from
Thermostat ON after start/stop
switch ON. When the thermostat
is OFF at the time of start/stop
switch ON, the 60 minutes will be
counted from the time of thermostat
ON. The initial OFF time is not
counted. Counting starts when the
thermostat becomes ON, and the
count then continues even if the
thermostat becomes OFF.

11. In case of switching from “Heating”
the reversing valve is held for 3
minutes.

12. The defrosting signal is not
accepted with overload input, and
the operation becomes as shown
below when the overload input
disappears.

(1) When previously the

defrosting signal existed
without overload input,
defrosting will start
immediately.

(2) In cases other than the

above, defrosting will be
executed with a defrosting
signal in the condition
without overload input.

– 18 –

Down

Up

❈ Swing start direction

Down

Up

“NICE
TEMPERA-

10

TURE”
reservation

● Operation starts in advance so that the room temperature reaches

the preset value at the set time.

● The operation time is obtained as follows depending on the room

temperature when operation starts.

(1) Calculation method of the moved-up time.

Moved-up time (MT) = Moved-up time depending on the temperature
difference (OT) + compensation time (HT).
MT is at least 1 minute if OT is not zero.

Heating Cooling
(MT) 00 ~ 60 min. 00 ~ 60 min.
(OT) 00 ~ 60 min. 00 ~ 60 min.
(HT) –60 ~ 60 min. –60 ~ 60 min.

Obtain OT (moved-up time depending on the temperature difference)
from the table below.

Heating Cooling

Setting temp.–Room temp. Time (min.) Setting temp.–Room temp. Time (min.)

00 – 01.00 00 00.00 – 02.00 00

01.25 – 03.00 10 02.25 – 05.00 15

03.25 – 07.00 20 05.25 – 08.00 30

07.25 – 10.00 30 08.25 – 11.00 45

10.25 – 13.00 40 11.25 – 60

13.25 – 16.00 50

16.25 – 19.00 60

19.25 – 22.00 60

22.25 –
❈ The preset temperature value shown above does not

include any shift value.

(2) Compensation

1 The “Attained” state is monitored and a “Not attained” check is

done to revise the compensation time (HT).

“Attained” monitor
Continuously monitored during “NICE TEMPERATURE” operation.

(Heating)
When the room temperature < Set value + compensation shift, it

is regarded to be “attained” and 5 minutes are reduced from the
compensation time.

(Cooling)
When the room temperature < Set value + compensation shift, it’s

operated same as above.

“Not attained” check
Performed once when the “NICE TEMPERATURE” timer is completed.

● The air deflector control operation shown below is done when the swing switch

is pressed or when the operation mode is changed.

● The air deflector control operation shown below is done when the operation

switch is turned off.

Item

3-way AUTO (Swing)

Specification

Cooling/
dehumidi­fying

Air
blowing

8

direction
control

Heating

The same as cooling ● dehumidifying

(When the
operation
switch is
turned off
Automatic
shut
operation)

Table 1 Specifications

Item RAS-18CH1/RAS-24CH2

Automatic Yes
Heating Yes

Operation switching Sensor dehumidification Yes

Cooling Yes

Fan Yes
Temporary switch Yes (automatic)
Service switch Cooling Yes
Nice temperature reservation Yes
Defrosting Yes
Sleep circuit Yes
Heater operation at the time of sensor dehumidification No
Automatic blowing direction Yes
Filter sign Yes
Wireless mode Heat and Cool wireless

Other detailed specifications

1. When the room temperature starts to
increase within 3 minutes after thermo
OFF in “cooling” and fan speed “AUTO”,
the fan speed changes L ➞ M ➞ H as
when thermo ON.

2. If “cooling” is selected during “sensor
dehumidification” operation the operation
continues as it is with the thermo ON.
The 3 minutes delay is not started. The
set temperature and fan speed depend
on the remote control signal.
It is same for “cooling” – – – – “sensor
dehumidification”. It is same for “AUTO”
sensor dehumidification cooling “sensor
dehumidification” “cooling”.

3. The filter sign lights after 100 hours
operation of the room fan. The lamp goes
out when the POWER SWITCH set to
OFF and ON again.

4. After the failure mode is started (indicator
lamp flickering), rapid mode changing
cannot be done.

5. If the operation is made by the nice
temperature reservation during the sleep
operation, the normal operation
continuously occurs, and for the advance
time, the temperature difference between
the set temperature without sleep shift
and “room temperature” is used.

(Heating)
When the room temperature < Set value + compensation shift 1°C,

it is regarded to be “Not attained” and 5 minutes are added to the
compensation time.

(Cooling)
When the room temperature > Set value + compensation shift

+1°C, it’s operated same as above.

❈ If the room temperature is within +1°C from the set value +

compensation shift, compensation is not done.

Table 2 Sensor operation values

Item

ON temperature

Thermostat operation (Thermostat relay)

power relay (°C)
Differential (°C)

Low-temperature defrosting

(T1)

Cooling, sensor
dehumidification

RAS-18CH1/RAS-24CH2
16 17.6
24 25.6

33.6

0.33

ON (°C) 4.0

Reset (°C) 12.0

– 19 –

REFRIGERATING CYCLE DIAGRAM

COMPRESSOR

COOLING, DEHUMIDIFYING, DEFROSTING

OUTDOOR UNIT

INDOOR UNIT

SERVICE V ALVE

SUCTION
TANK

ACCUMULATOR

ACCUMULATOR

REVERSING
VALVE

CHECKVALVE

CAPILLARY

STRAINER

STRAINER

SERVICE V ALVE

SINGLE-ENDED
UNION

SINGLE-ENDED
UNION

CAPILLARY

HEATING

OUTDOOR UNIT

COMPRESSOR

INDOOR UNIT

SERVICE V ALVE

SUCTION
TANK

REVERSING
VALVE

CHECKVALVE

CAPILLARY

STRAINER

STRAINER

SERVICE V ALVE

SINGLE-ENDED
UNION

SINGLE-ENDED
UNION

CAPILLARY

MODEL RAS-18CH1/RAC-18CH1

– 20 –

REFRIGERATING CYCLE DIAGRAM

MODEL RAS-24CH2/RAC-24CH2

COOLING, DEHUMIDIFYING, DEFROSTING

OUTDOOR UNIT

BY PASS

CAPILLARY

CHECK VALVE

CAPILLARY

CHECKVALVE

STRAINER

STRAINER

CHARGING

PIPE

CAPILLARY

SUCTION
TANK

COMPRESSOR

REVERSING
VALVE

P-VALVE

VACUUM PIPE

JOINT PIPE

CHECK
VALVE

SERVICE V ALVE

SERVICE V ALVE

ACCUMULATOR

INDOOR UNIT

SINGLE-ENDED
UNION

SINGLE-ENDED
UNION

HEATING

OUTDOOR UNIT

STRAINER

CHECK VALVE

CHECKVALVE

CHARGING

PIPE

BY PASS

CAPILLARY

CAPILLARY

STRAINER

SUCTION
TANK

COMPRESSOR

REVERSING
VALVE

P-VALVE

VACUUM PIPE

JOINT PIPE

CAPILLARY

SERVICE V ALVE

ACCUMULATOR

SERVICE V ALVE

INDOOR UNIT

SINGLE-ENDED
UNION

SINGLE-ENDED
UNION

– 21 –

DESCRIPTION OF MAIN CIRCUIT OPERATION

ON/OFF button

Timer reserve button
(Sleeping)

Operation lamp

Timer lamp

When OFF
timer
(sleeping)
is set

Start Stop Start

"OFF" time

When ON
timer is set

"ON" time

ON/OFF button

Timer reserve button

Operation lamp

Timer lamp

Stop

Start

1. ON / OFF

The “ON / OFF”, “Timer reserve button” and “Sleeping” operations function independently.
Their operations are shown in Fig. 1-1.

Fig. 1-1 Timer operation

– 22 –

2. Reset Circuit

12V

R511

ZD511

R512

0V

5V

Micro computer

26

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

RES

R514

Q512

R513

Q511

+

C511

–

R515

C512

0V

12V

DC12V Line

7V
5V

DC5V Line

Base

POWER ON

POWER OFF

Micro computer
Pin 26

● The reset circuit is used to reset the program to its initial settings when the power is turned on or when the

5V

power hss recovered after a power failure.

● The micro computer is reset when the reset input is “Hi”, and operation is possible when the reset input is

“Lo”.

● The waveforms at each point when the power is turned on and off are shown in the diagrams.

● When the power is turned on, the voltages of the DC 12V line and DC 5V lines are increased. When the

voltage of DC 12V lines reach about 7V, ZD511 is turned ON, the potential of Q511’s base rises and Q511
is turned ON. Since Q511’s collector is set to “LO”, Q512 is turned OFF and the reset input of
the micro computer is set to “Lo”. The DC 5V line voltage has already become 5V and the micro
computer starts operation.

● When the power is turned OFF, the voltage of the DC 12V line decreases. When it becomes about 7V, ZD511

is turned OFF, then Q511 is turned OFF, Q512 is turned ON, the reset input of the micro computer is set to
“Hi" and the micro computer is set to the reset mode.

– 23 –

3. Buzzer Circuit

R621

R712

C710

ZD701

0V

0V

R622

Receiver

Unit

R714

R713

12V

27

Micro computer

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

REMOCON I/P

12V

BZ1

B.Z

Q302

0V

R801

Micro computer

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

30

BUZZER

When the buzzer is to be activated, buzzer output pin 30 of the micro computer alternates between ON and OFF
repeatedly at 4kHz and Q302 is turned ON/OFF accordingly. A 4kHz voltage is applied to the buzzer and the
diaphragm of the buzzer vibrates to output 4kHz sound.

4. Initial Setting (IC301)

The pre-heating operation start value, ratings of the compressor, maximum rotation speed, etc. are preset in
the micro computer.

5V

D302

D301

5. Receive Circuit

R303

R306

87

65

IC301

2

(E

PROM)

12 4

3

5V

C301

0V

C302

D304

0V

D303

R302
R305

Micro computer

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

3
4

Infrared signals from the wireless remote controller are received by the light receiving unit and output after being
amplified and shaped.

– 24 –

6. Service Operation Circuit

5V

Micro computer

(AX-3T2)

R606

(AX-3T3)

FORCE COOL 42

Cool
Normal

0V

● Use the service switch to select “Cooling” temporarily when the interior electric equipment has mis-functioned.

● Setting the switch to “Cooling” causes continuous cooling room temperature control. To control the room

temperature, turn on and off the disconnect switch. To protect the compressor, wait at least 3 minutes
before turning on again.

● The fan speed is “MED”.

● Does not operate when 12V is not generated in the control circuit.

● When the service switch is used for operationeach change switch is overridden.

● Setting the service switch to “Cooling” turns on the “Stick relay” and “Power relay”.

– 25 –

AUTO SWING FUNCTION

INPUT SIGNAL OPERATING SPECIFICATION REFERENCE

KEY INPUT

OPERATION OPERATION MODE AIR DEFLECTOR

STOP

DURING
OPERATION

– 26 –

INTERNAL FAN
ON
(THERMO. ON)

INTERNAL FAN
OFF
(THERMO. OFF)

DURING
OPERATION

PRESENT CONDITION

EACH MODE

AUTO COOL
COOL
FAN
AUTO DRY
DRY

CIRCULATOR

AUTO DRY
DRY
CIRCULATOR

STOP

DURING ONE SWING

STOP

DURING SWINGING

STOP

DURING SWINGING

TEMPORARY STOP

DURING SWINGING

ONE SWING (CLOSING AIR DEFLECTOR)
1 DOWNWARD
2 UPWARD

STOP AT THE MOMENT.

START SWINGING
1 DOWNWARD
2 UPWARD
3 DOWNWARD

STOP AT THE MOMENT.

START SWINGING
1 DOWNWARD
2 UPWARD
3 DOWNWARD

STOP AT THE MOMENT.

START SWING AGAIN.

STOP SWINGING TEMPORARILY.
(SWING MODE IS CLEARED IF SWING COMMAND IS
TRANSMITTED DURING TEMPORARY STOP.)

INITIALIZE AT NEXT
OPERATION.

MAIN SWITCH
ON

MAIN SWITCH
OFF

CHANGE OF
OPERATION

STOP

DURING
OPERATION

DURING
OPERATION

COOL
FAN
DRY

CIRCULATOR

EACH MODE

EACH MODE

STOP
DURING ONE SWING

STOP
DURING ONE SWING

STOP
DURING SWINGING

DURING
INITIALIZING

STOP

DURING SWINGING

INITIALIZE
1 DOWNWARD
2 UPWARD

INITIALIZE
1 DOWNWARD

ONE SWING (CLOSING AIR DEFLECTOR)
1 DOWNWARD
2 UPWARD

INITIALIZING CONDITION OF EACH MODE.
STOP SWINGING AND MODE BECOMES INITIALIZING

CONDITION.

INITIALIZE AT NEXT
OPERATION.

SERVICE CALL Q & A

Cooling operation

While cooling, the

Q1

compressor sometimes stops
abruptly.

Dehumidifying operation

The fan speed does not

Q2

change during a
dehumidifying operation.

Cold air comes out during a

Q3

dehumidifying operation.

The operation does not stop

Q4

even by raising the room
temperature setting of remote
control at a dehumidifying
operation.

Check whether frost sticks

A1

on the heat exchanger of in­door unit or not.
Wait for 3 – 4 minutes until
the frost melts.

The fan speed is always LO

A2

at a dehumidifying operation.

To improve the dehumidi-

A3

fication efficiency, LO fan
speed operation is
performed. Therefore the air
is cold. This is not a trouble.

At a dehumidifying operation,

A4

the actual room temperature is
compared with the room tem­perature setting when starting
the operation and the opera­tion is as follows.

1) When actual room tem­perature > room tempera­ture setting.
The operation is according
to the room temperature
setting on the remote con­troller.

2) * When actual room tem­perature < room tempera­ture setting
Regardless of the room
temperature setting, the
temperature is automati­cally set slightly lower than
the room temperature.

In this case, the status is as 2)
and, therefore, the operation
by the room temperature
control is impossible. Turn off
the On / OFF switch, set the
room temperature to a new
value and turn on the opera­tion by the On / Off switch.

If cooling is performance
when the room temperature
is low, frost may stick on the
heat exchanger of indoor
unit.

In the dehumidifying mode,

Q5

the temperature set by
remote controller is set
slightly higher than the room
temperature but the
operation starts.

This is the status in 2) of

A5

(A4). The temperature is set
a little lower than the room
temperature to carry out a
dehumidifying operation as
far as possible.

– 27 –

Heating operation

Air does not come out when

Q6

starting a heating operation.

Air does not come out

Q7

sometimes while in a heating
operation.

The fan speed is set to “HI”

Q8

or “MED” but the heating
operation starts with a LO fan
speed.

The operation stops during

Q9

a heating operation while the
room temperature is set at
“30”.

It is not a trouble. The fan is

A6

stopped to avoid cold wind.

Defrosting is on. Wait for 5–

A7

10 minutes unit the outdoor
unit is defrosted.

The heating operation

A8

starts with a LO fan speed
for 30 seconds. If the fan
speed is set to HI, the
operation starts with LO fan
speed, followed by MED
fan speed for 30 seconds
and then by HI fan speed.

If a heating operation is per-

A9

formed when the exterior
temperature is high, the op­eration may stop to protect
the equipment.

When starting the operation,
the heat exchanger is cold
and, therefore, the fan is
stopped.
Wait 2–3 minutes.

Q10

Q11

The outdoor fan does not
move at a heating operation
by the service switch.

Auto fresh defrosting

Heating has been turned off by the main
operation but the “Hot keep lamp” lights and
the outdoor unit operations.

It is not a trouble.

A10

When heating, the outdoor
fan is stopped to avoid ex­cessive pressure rise.

A11

“Auto fresh defrosting” operates. When
stopping the operation, whether the outdoor
unit is frosted or not is checked and, if in the
affirmative, defrosting is performed before
stopping the operation.

– 28 –

Automatic operation

How is the automatic

Q12

operation mode determined?

At an automatic operation,

Q13

changing the fan speed
change switch does not vary
the fan speed.

According to the room

A12

temperature, cooling or
dehumidifying operation is
automatically selected.

Cooling:

When room temperature is
approx. 27°C or higher

Dehumidifying:

When room temperature is
between approx. 23°C and
27°C

Heating:

When room temperature is
approx. 23°C or lower

The fan speed is automati-

A13

cally determined.

The room temperature

Q14

cannot be controlled at an
automatic operation.

It is automatically set as

A14

follows.
At cooling: Set at 27°C
At dehumidifying:

Set slightly
lower than room
temperature

The room temperature
setting can be raised 3°C by

V

“ ” or lowered 3°C by “ V ”.

When changing the room
temperature setting in an
automatic operation, the next
automatic operation mode is
determined by new room
temperature setting.

If, for example, the room
temperature setting is 2°C
lowered for example, the
operation mode is as follows.

Cooling : When room

temperature is
approx. 25°C or
higher

Dehumidifying :

When room
temperature is
between approx.
21°C and 25°C

Heating :

When room
temperature is
approx. 21°C or
lower

– 29 –

Common, etc.

There is a difference

Q15

between the room
temperature setting and
actual room temperature.

What will happen if the time

Q16

setting is changed while in a
timer operation?

In the “Automatic fan speed”

Q17

mode, the indoor fan
changes to MED and LO fan
speed.

There may be a difference

A15

between the room
temperature setting and
actual room temperature on
account of the room
structure, air flow, etc.
If there is a difference from
the room temperature, adjust
the set temperature to keep
living space at a comfortable
temperature.

A timer operation is

A16

performed until the time after
changing the time setting.

It is not a trouble. The cold

A17

wind preventive function
operates.

Set the temporary switch
normal.

Nice temperature reservation

In case of “ON” timer, the operation does not

Q18

start at a preprogrammed time but a little
earlier.

The time to start an operation is irregular

Q19

while preprogramming at the same time.

The “Nice temperature reservation” functions.

A18

The operation starts earlier so the room
temperature will be as set at a programmed
time.
The operation starts at most 60 minutes before
a preprogrammed time.

The “Nice temperature reservation” operates.

A19

The starting time depends on the room load.

– 30 –

Wireless remote controller

1) When the “Automatic”

Q20

operation mode is
selected, “Automatic”
does not change by
pressing the fan speed
select button.

2) The room temperature
setting is not displayed.

3) Pressing the room
temperature control button
develops transmit mark
“ ” and sounds a
receive sound but does
not display the room
temperature setting.

1) When the operation

A20

mode is “Automatic”, the
fan speed is
automatically fixed to
“Automatic”.

2) At an “Automatic”
operation, the room
temperature setting is not
displayed.
The room temperature is
automatically set as
follows.

At cooling
Set at 27°C.
At dehumidifying
Set to a temperature

slightly lower than the
room temperature.

At heating
Set at 23°C.

3) At an “Automatic”
operation, the room
temperature setting is not
displayed.
However, every pressing

V

“ ” or “ V ” button
changes 1°C within the
range of:
27±3°C when cooling,
23±3°C when heating.

The room temperature
sensing thermistor in the
indoor unit detects the room
temperature and, according
to the particular temperature,
automatically performs
“Cooling” or “Dehumidifying”
operation.
The value indicated not at an
“Automatic” but manual
operation is not the actual
room temperature but the
room temperature setting.

When the room temperature

Q21

setting is “16”, pressing the
room temperature control
button “ V ” causes no
transmission. At “32”,
pressing “ ” causes no
transmission either.

The timer cannot be set.

Q22

The current time disap-

Q23

pears soon.

The room temperature is

A21

settable within the range of
16 - 32 and not beyond.

V

Is the current time set?

A22

The timer cannot be set
unless the clock is adjusted
correctly.

The current time disappears

A23

soon and the timer settting
indication takes a
precedence.

When setting the current time,
its indication blinks for
approximately 3 minutes.

– 31 –

In spite of timer “Preprogram”,

Q24

the time setting is
extinguished.

Isn’t the time over the pre-

A24

programmed time?
As soon as the prepro­grammed time is reached, the
time setting disappears.

After selecting a

Q25

“Dehumidifying” operation
mode, the fan speed mode
remains “LO” fan speed”.

At a “Dehumidifying”

A25

operation, the “LO” fan speed”
is forcibly selected.

– 32 –

TROUBLE-SHOOTING

No cooling or heating

Operates by setting the service
switch to forced cooling?

YES

Return the service switch to
"Normal".

Set the remote controller to an
operation status and press the ON/
OFF button.

Is the level LO (approx. 0.5V)

NO

11

power

between driver IC701 pin
relay and 0V?

No operation at all.
*1

Check the following parts and replace if faulty

NO

2) Varistor

3) Power switch

4) Thermal fuse for
therminal board

5) Thermal fuse for
Terminal board

Power relay abnormal

YES
Compressor does not turn at LO.

Remove and check the continuity across.1) Current fuse
Check whether the appearance is blackish or

not.
The resistance must be infinite. *2

Check the continuity between contacts.
(96°C) Continuity across

also check the fan motor and capacitor.
(102°C) Continuity across

check the electric parts and replace if abnormal.

*2 Before checking the varistor, detach a terminal.

*1 Before using the service switch,

disengage and engage the plug. Do not
operate the remote controller.

➝ If there is no continuity,

➝ If there is no continuity,

Replace Power relay

Is the level LO (approx. 0.5V)
between driver IC701 pin
relay and 0V?

NO

Is voltage normal between Blue and
Red of the CN6? *3

NO

Is the level LO (approx. 0.5V)
between driver IC 701 pin
(Reversing valve relay) and 0V at
heating operation?

NO

10

stick

13

YES

YES

YES

Stick relay abnormal

Indoor fan motor or

Q904 abnormal

Reversing valve

relay abnormal

Replace Stick relay

Replace Reversing

valve relay

– 33 –

Is voltage normal (approx. 280 ~
300V) at out put side of the DB201?

NO

Check the circuit board of

control board

YES

Check the circuit board inside parts.
When checking, carry out a self
diagnosis by indoor indicator lamp.

*4 Wait for 3 minutes before forced

re-operation by the service switch.

*3

Fan Speed

HI

MED

LO

RAS-18CH1

Cooling Heating Cooling Heating

32.6

28.0

24.0

Replace faulty part

CN6 BLUE-RED (V)

RAS-24CH2

30.0

25.0

22.5

32.6

28.0

24.0

32.6

27.6

25.0

– 34 –

Timer-Lamp, break-down checking in blinking sign.

Check the break-down factor from the frequency of timer-lamp blinking.

No. Mode of Timer-Lamp blinking Indication Factor Estimated Break-Down Part

4-way valve not working

1

5

sec.

–––––––– 1 time

Inside temperature is low in heating
operation time or inside
temperature is high in cooling
operation time.

Force cooling operation

5

2

sec.

––––––– 2 times

Unit is under forcible operation or
under balancing after forcible

(1) 4-way valve is not working.
(2) Heat-exchanger thermistor is

in disconnection.

(Only heating time)

Check force cooling switch at
indoor electrical.

operation.

DC Fan motor - over flow of

(1) Indoor - Fan is locked.

electricity

5

3

––– 10 times

sec.

Indoor - DC Fan motor has over

(2) Indoor - Fan motor damage.

flow of electricity.

(3) Indoor - control circuit board.

IC 401 Data read wrongly

5

4

––– 13 times

sec.

In case that data read from IC401
is wrong.

IC401 data is not in order.

5

6

5

sec.

5

sec.

––– 14 times

–– –– 15 times

( –– 0.5 second on, 0.5 second off.)

Heat exchanger thermistor
error

Heat exchanger thermistor open
or short-circuit detected.

Room thermistor error

Room thermistor error open or
short-circuit detected.

(1) Thermistor
(2) Indoor - control circuit board.

(1) Thermistor
(2) Indoor - control circuit board.

CAUTION

!

Remote control is disabled while the Timer lamp is flashing.
To check operation, turn off the power switch and turn it on again.

– 35 –

ASSEMBLY DIAGRAM
OUTDOOR UNIT

MODEL : RAC-18CH1

14

18

17

13

16

12

15

8

9

7

11

19

10

6

21

20

24

2

23

1

4

5

22

3

– 36 –

5

4

1

8

9

15

7

6

18

17

25

14

16

13

10

11

12

22

3

23

26

20

24

21

19

2

ASSEMBLY DIAGRAM
OUTDOOR UNIT

MODEL : RAC-24CH2

– 37 –

PARTS LIST
INDOOR UNIT

MODEL : RAC-18CH1/RAS-24CH2

REF

RAC-18CH1 RAC-24CH2

1 PMRAC-18CH1 906 PMRAC-63CHA1 909 BASE
2 PMRAC-18CV3 901 PMRAC-63CHA1 901 COMPRESSOR
3 PMRAC-5142CHV1 902 PMRAC-63CHA1 908 COMPRESSOR RUBBER
4 PMRAC-51CHA1 908 PMRAC-51CHA1 908 VALVE (2-S)
5 PMRAC-51CHA1 909 PMRAC-63CHA1 907 VALVE (5-S)
6 PMRAC-51CHA1 902 PMRAC-63CHA1 903 CONDENSER
7 PMRAC-40CNH2 918 PMRAC-40CNH2 918 FAN MOTOR SUPPORT
8 PMRAC-18CH1 901 PMRAC-51CHA1 906 FAN MOTOR

9 PMRAC-40CNH2 917 PMRAC-40CNH2 917 PROPELLER FAN
10 PMRAC-51CHA1 903 PMRAC-51CHA1 903 TERMINAL BOARD (4-P)
11 PMRAC-18CH1 902 PMRAC-53CHA1 910 COMPRESSOR CAPACITOR
12 PMRAC-18CH1 903 PMRAC-18CH1 903 FAN MOTOR CAPACITOR
13 PMRAC-40CNH2 926 PMRAC-40CNH2 926 SIDE PLATE (L)
14 PMRAC-18CH1 907 PMRAC-18CH1 907 CABINET
15 PMRAC-51CHA1 907 PMRAC-51CHA1 907 GRILL ASSEMBLY
16 PMRAC-40CNH2 923 PMRAC-40CNH2 923 SIDE PLATE (R)
17 PMRAC-40CNH2 921 PMRAC-40CNH2 921 NET
18 PMRAC-40CNH2 922 PMRAC-40CNH2 922 TOP COVER
19 PMRAC-18CH1 904 PMRA-139FF 903 OVERLOAD RELAY COVER
20 PMRAC-18CH1 905 PMRAC-18CH1 905 REVERSING VALVE COIL
21 PMRAC-51CHA1 904 PMRAC-51CHA1 904 REVERSING VALVE
22 PMRAC-51CHA1 905 PMRAC-63CHA1 904 STRAINER (CAPI)
23 PMRAC-51CHA1 910 PMRAC-63CHA1 905 STRAINER (COND)
24 PMRAC-18JHVP2 901 PMRAC-63CHA1 906 CHECK VALVE
25 - PMRAC-63CHA1 902 CHECK VALVE
26 - PMRAC-63CHA1 911 PRESSURE VALVE

PART No.

DESCRIPTION

– 38 –

ASSEMBLY DIAGRAM
INDOOR UNIT

MODEL : RAS-18CH1/RAS-24CH2

38

44

35

32

31

37

39

40

45

42

43

41

33

55

53

50

54

36

49

57

46

44

47

– 39 –

48

52

51

56

PARTS LIST
INDOOR UNIT

MODEL : RAS-18CH1/RAS-24CH2

REF

RAS-18CH1 RAS-24CH2

31 PMRAS-51CHA1 001 PMRAS-51CHA1 001 CABINET
32 PMRAS-40CNH2 023 PMRAS-40CNH2 023 MOUNTING PLATE
33 PMRAS-51CHA1 002 PMRAS-51CHA1 002 FAN MOTOR
34 PMRAS-51CHA1 003 PMRAS-51CHA1 003 TANGENTIAL FAN
35 PMRAS-25CNH2 005 PMRAS-25CNH2 005 P-BEARING ASSEMBLY
36 PMRAS-51CHA1 004 PMRAS-51CHA1 004 FAN MOTOR BASE
37 PMRAS-51CHA1 005 PMRAS-51CHA1 005 CYCLE ASSEMBLY
38 PMRAS-51CHA1 020 PMRAS-51CHA1 020 FAN COVER
39 PMRAS-40CNH2 025 PMRAS-40CNH2 025 PIPE SUPPORT
40 PMRAS-18CH1 002 PMRAS-18CH1 002 DRAIN PAN ASSEMBLY
41 PMRAS-51CHA1 008 PMRAS-51CHA1 008 AUTO SWEEP MOTOR
42 PMRAS-18CH1 001 PMRAS-18CH1 001 PCB (LED)
43 PMRAS-18CH1 003 PMRAS-18CH1 003 FRONT COVER ASSEMBLY
44 PMRAS-18CH1 004 PMRAS-18CH1 004 FRONT PANEL
45 PMRAS-25CNH2 019 PMRAS-25CNH2 019 CAP
46 PMRAS-51CHA1 010 PMRAS-51CHA1 010 FILTER
47 PMRAS-51CHA1 011 PMRAS-51CHA1 011 REMOTE CONTROL ASSEMBLY
48 PMRAS-10C3M 003 PMRAS-10C3M 003 REMOTE CONTROL SUPPORT
49 PMRAS-51CHA1 015 PMRAS-40CNH2 026 THERMISTOR SUPPORT
50 PMRAS-51CHA1 016 PMRAS-51CHA1 016 THERMISTOR
51 PMRAS-18CP2R 002 PMRAS-18CP2R 002 POWER SWITCH
52 PMRAS-51CHA1 006 PMRAS-63CHA1 002 PCB (MAIN)
53 PMRAS-51CHA1 013 PMRAS-51CHA1 013 PCB (POWER SW SUPPLY)
54 PMRAS-51CHA1 017 PMRAS-51CHA1 017 TERMINAL BOARD (FUSE)
55 PMRAS-51CHA1 018 PMRAS-51CHA1 018 THERM-FUSE FOR PCB
56 PMRAS-51CHA1 019 PMRAS-51CHA1 019 PCB (RECEIVER)
57 PMRAC-07CV1 006 PMRAC-07CV1 006 TERMINAL BOARD (2-P)

PART NO.

DESCRIPTION

– 40 –

PARTS LIST
MAIN BOARD COMPONTENTS

MODEL : RAS-18CH1/RAS-24CH2

*** FOR REFERENCE ONLY ***

CRN DESCRIPTION

IC1 IC AX-3T2/AX-3T3
IC301 IC S24C01BDP
IC701 IC ULN2003AN
REG1 IC TL5001CP
REG2 IC MC7805CT

ICP1 ICP-0.6AT RADIAL

ICP2 ICP-2.0AT RADIAL
Q301 TRANSISTOR AA1A4M RADIAL
Q302 TRANSISTOR AA1A4M RADIAL
Q303 TRANSISTOR AA1A4M RADIAL
Q511 TRANSISTOR 2SC458CT RADIAL
Q512 TRANSISTOR 2SA673CT RADIAL
Q901 TRANSISTOR 2SJ326
Q903 TRANSISTOR 2SA1757F
Q904 TRANSISTOR 2SC1214CTZ

RADIAL

LD721 LED SEL6914A YELLOW
LD723 LED SEL6214S RED
LD725 LED SEL6414E GREEN

D102 DIODE D1NL40
D301 DIODE 1SS-120
D302 DIODE 1SS-120
D303 DIODE 1SS-120
D304 DIODE 1SS-120
D401 DIODE 1SS-120
D701 DIODE 1SS-120
D902 DIODE D2S6M
D904 DIODE ISS131

DB201 DIODE D3SB60
ZD100 ZENER DIODE HZ24-3
ZD101 ZENER DIODE HZ24-3
ZD102 ZENER DIODE HZ30-2
ZD511 ZENER DIODE HZ7B2
ZD701 ZENER DIODE HZ5.1B-J

L101 INDUCTOR 82µH 1.3A

L102 INDUCTOR 560µH 0.6A

L901 INDUCTOR 450µH 1.5A
R100 RESISTOR 5.6K ±5% 1/4W
R101 RESISTOR 120K ±5% 1/6W
R102 RESISTOR 33K ±2% 1/6W
R103 RESISTOR 3K ±2% 1/6W
R104 RESISTOR 130K ±5% 1/6W
R105 RESISTOR 470 ±5% 1/4W
R106 RESISTOR 330 ±5% 1/4W
R107 RESISTOR 330 ±5% 1/4W
R108 RESISTOR 2.2K ±5% 1/6W

R109 RESISTOR 220K ±5% 1/6W
R205 RESISTOR 7.5 ±5% 7W
R206 RESISTOR 560K ±5% 1/2W
R302 RESISTOR 390 ±5% 1/6W
R303 RESISTOR 5.1K ±5% 1/6W
R304 RESISTOR 390 ±5% 1/6W
R305 RESISTOR 390 ±5% 1/6W
R306 RESISTOR 5.1K ±5% 1/6W
R307 RESISTOR 390 ±5% 1/6W
R313 RESISTOR 10K ±5% 1/6W
R314 RESISTOR 10K ±5% 1/6W
R315 RESISTOR 10K ±5% 1/6W
R316 RESISTOR 10K ±5% 1/6W
R317 RESISTOR 10K ±5% 1/6W
R318 RESISTOR 10K ±5% 1/6W
R319 RESISTOR 10K ±5% 1/6W
R320 RESISTOR 10K ±5% 1/6W
R321 RESISTOR 1K ±5% 1/6W
R331 RESISTOR 1K ±5% 1/6W
R332 RESISTOR 10K ±5% 1/6W
R361 RESISTOR 12.7K ±1% 1/6W
R362 RESISTOR 1K ±5% 1/6W
R381 RESISTOR 18K ±1% 1/6W
R382 RESISTOR 1K ±5% 1/6W
R383 RESISTOR 2.4K ±2% 1/6W
R404 RESISTOR 10K ±5% 1/6W
R405 RESISTOR 1K ±5% 1/6W
R509 RESISTOR 0 ±5% 1/6W
R510 RESISTOR 1M ±5% 1/6W
R511 RESISTOR 3K ±5% 1/6W
R512 RESISTOR 10K ±5% 1/6W
R513 RESISTOR 5.1K ±5% 1/6W
R514 RESISTOR 2.7K ±5% 1/6W
R515 RESISTOR 5.1K ±5% 1/6W
R318 RESISTOR 10K ±5% 1/6W
R319 RESISTOR 10K ±5% 1/6W
R320 RESISTOR 10K ±5% 1/6W
R321 RESISTOR 1K ±5% 1/6W
R331 RESISTOR 1K ±5% 1/6W
R332 RESISTOR 10K ±5% 1/6W
R361 RESISTOR 12.7K ±1% 1/6W
R362 RESISTOR 1K ±5% 1/6W
R381 RESISTOR 18K ±1% 1/6W
R382 RESISTOR 1K ±5% 1/6W
R383 RESISTOR 2.4K ±2% 1/6W
R404 RESISTOR 10K ±5% 1/6W
R405 RESISTOR 1K ±5% 1/6W
R509 RESISTOR 0 ±5% 1/6W
R510 RESISTOR 1M ±5% 1/6W

– 41 –

R511 RESISTOR 3K ±5% 1/6W
R512 RESISTOR 10K ±5% 1/6W
R513 RESISTOR 5.1K ±5% 1/6W
R514 RESISTOR 2.7K ±5% 1/6W
R515 RESISTOR 5.1K ±5% 1/6W
R601 RESISTOR 10K ±5% 1/6W
R602 RESISTOR 10K ±5% 1/6W
R603 RESISTOR 10K ±5% 1/6W
R604 RESISTOR 10K ±5% 1/6W
R605 RESISTOR 1K ±5% 1/6W
R606 RESISTOR 5.1K ±5% 1/6W
R607 RESISTOR 10K ±5% 1/6W
R608 RESISTOR 1K ±5% 1/6W
R609 RESISTOR 1K ±5% 1/6W
R610 RESISTOR 10K ±5% 1/6W
R621 RESISTOR 1K ±5% 1/6W
R622 RESISTOR 47 ±5% 1/6W
R712 RESISTOR 1K ±5% 1/6W
R713 RESISTOR 2K ±5% 1/6W
R714 RESISTOR 2K ±5% 1/6W
R801 RESISTOR 3.3K ±5% 1/6W
R721 RESISTOR 240 ±5% 1/6W
R723 RESISTOR 300 ±5% 1/6W
R725 RESISTOR 240 ±5% 1/6W
R906 RESISTOR 0.2 ±5% 1W
R911 RESISTOR 300 ±5% 1/6W
R913 RESISTOR 2.0K ±5% 2W
R914 RESISTOR 2.0K ±5% 2W
R916 RESISTOR 3.3K ±5% 1/6W
R917 RESISTOR 3.3K ±5% 1/6W
R919 RESISTOR 20K ±1% 1/6W
R920 RESISTOR 2.21K ±1% 1/6W
R930 RESISTOR 1K ±1% 1/6W
R931 RESISTOR 8.25K ±1% 1/6W
R932 RESISTOR 5.1K ±5% 1/6W
C101 ELECTROLYTIC CAPACITOR (PF)

220µ 50V

C102 ELECTROLYTIC CAPACITOR (PF)

68µ 50V RADIAL

C103 ELECTROLYTIC CAPACITOR (VR)

220µ 10V RADIAL

C104 CERAMIC CAPACITOR 0.1µ 25V

RADIAL

C105 CERAMIC CAPACITOR 1000P 50V

RADIAL

C106 FILM CAPACITOR 0.1µ 50V

RADIAL

C107 CERAMIC CAPACITOR 0.047µ 25V

RADIAL

C108 CERAMIC CAPACITOR 1000P 50V

RADIAL

C109 ELECTROLYTIC CAPACITOR (PF)

1µ 50V RADIAL

C205 FILM CAPACITOR 0.082µ AC 300V

C206 CERAMIC CAPACITOR 1000P

±20% AC 250V

C207 CERAMIC CAPACITOR 1000P

±20% AC 250V

C208 FILM CAPACITOR 0.047µ AC 300V
C209 CERAMIC CAPACITOR 0.01µ AC

400V

C210 CERAMIC CAPACITOR 0.01µ AC

250V

C211 CERAMIC CAPACITOR 0.01µ AC

250V

C212 ELECTROLYTIC CAPACITOR 100µ

DC 450V

C301 CERAMIC CAPACITOR 0.1µ 50V

RADIAL

C302 CERAMIC CAPACITOR 0.1µ 50V

RADIAL

C321 CERAMIC CAPACITOR 0.1µ 50V

RADIAL

C361 CERAMIC CAPACITOR 0.047µ 25V

RADIAL

C381 CERAMIC CAPACITOR 0.047µ 25V

RADIAL

C401 CERAMIC CAPACITOR 0.1µ 50V

RADIAL

C402 ELECTROLYTIC CAPACITOR (VX)

10µ 16V RADIAL

C403 ELECTROLYTIC CAPACITOR (VX)

10µ 16V RADIAL

C501 CERAMIC CAPACITOR 0.1µ 50V

RADIAL

C511 ELECTROLYTIC CAPACITOR (VX)

33µ 6.3V RADIAL

C512 CERAMIC CAPACITOR 0.1µ 25V

RADIAL

C601 CERAMIC CAPACITOR 0.1µ 25V

RADIAL

C621 ELECTROLYTIC CAPACITOR (MF)

47µ 16V

C710 CERAMIC CAPACITOR 1000P 50V

RADIAL

C901 ELECTROLYTIC CAPACITOR (PF)

150µ 50V

C902 CERAMIC CAPACITOR 0.1µ 25V

RADIAL

VARISTOR1 VARISTOR 450NR-12D
VARISTOR2 VARISTOR 450NR-12D

OSC1 OSCILLATOR EF0EC8004A

SW1 TEMPOPARY SWITCH ESD172306

CN1 CONNECTOR XH-3P (TOP ENTRY)

WHITE (THERM-FUSE 2-P
TERMINAL)

CN2 CONNECTOR ZR-4P (TOP ENTRY)

IVORY (INDICATING BOARD)

CN3 CONNECTOR VH-2P (3-P

CONNECTOR TOP ENTRY) BLACK
(REVERSING VALVE & OUTDOOR
FAN RELAY)

CN4 CONNECTOR XH-3P (TOP ENTRY)

WHITE (THERM-FUSE - PCB)

– 42 –

CN8B CONNECTOR B2P3-VH (TOP

CN10 CONNECTOR B2B-XH-A (TOP

CN11 CONNECTOR ZR-7P (TOP ENTRY)

CN12 CONNECTOR VH-4P (TOP ENTRY)

CN13 CONNECTOR BNH-6P (SIDE

CN14 CONNECTOR XH-4P (TOP ENTRY)

CN15 CONNECTOR PH-4P (SIDE ENTRY)

CN16 CONNECTOR ZR-3P (SIDE ENTRY)

REF1 POWER RELAY G4A-RY-200

REF2 STICK RELAY G4A-RY-200

REF3 REVERSING VALVE RELAY G5N-

- SURGE ABSORBER DSA-362MA-05

- BUZZER PKM13EPY

- FUSE RESISTOR RF25S

- SERVICE SWITCH SSSS9AE

- INFRARED RECEIVER SBX8035-F

- NOISE FILTER SU16V-10035

- 3.15A FUSE GLASS CAPSULE

- OUTDOOR FAN RELAY G5N-

- BLACK WIRE SIN-21T-1.8S

- WHITE WIRE SIN-21T-1.8S

- RED WIRE SIN-21T-1.8S

- BROWN WIRE SIN-21T-1.8S

- EARTH (GREEN) SIN-41T-2.4S

- BLUE WIRE SIN-21T-1.8S

- YELLOW WIRE SIN-21T-1.8S

- RED WIRE SIN-21T-1.8S

ENTRY) WHITE (POWER SUPPLY)

ENTRY) WHITE (POWER SUPPLY)

IVORY (RECEIVER BOARD)

WHITE (ROOM HEX.
THERMISTOR)

ENTRY) WHITE (STEPPING
MOTOR)

WHITE (HA TERMINAL)

WHITE (EEPROM)

IVORY (TEST PIN)

RELAY

RELAY

– 43 –

above 50mm

above 100mm

above

0.45m

above 300mm

must not bend

above 100mm

2,500mm or more

1

2

4

5

3

Maximum pipe length 15m

above 200mm

above 700mm

above 200mm

above 50mm when
installed on the
ceiling of balcony

(

)

above 100mm

above 100mm

give clearance as
wide as possible

Plug

7

FOR SERVICE PERSONNEL ONLY

!

!

Connection

Horizontally
perpendicular
to the unit

●

Carefully read through the procedures of proper
installation before starting installation work.

●

The sales agent should inform customers regarding
the correct operation of installation.

SPLIT UNIT AIR CONDITIONER

INSTALLATION MANUAL

Indoor Unit Outdoor Unit
RAS-18CH1 RAC-18CH1

SAFETY PRECAUTION

●

Read the safety precautions carefully before operating the unit.

●

The contents of this section are vital to ensure safety. Please pay special attention to the following sign.

WARNING ........ Incorrect methods of installation may cause death or serious injury.

!
!

CAUTION ......... Improper installation may result in serious consequence.

Be sure that the unit operates in proper condition after installation. Explain to customer the proper way of operating
the unit as described in the user’s guide.

!

WARNING

●

Please request your sales agent or qualified technician to install your unit. Water leakage, short circuit or fire may occur if you
do the installation work yourself.

●

Please observe the instructions stated in the installation manual during the process of installation. Improper installation may
cause water leakage, electric shock and fire.

●

Make sure that the units are mounted at locations which are able to provide full support to the weight of the units. If not, the
units may collapse and impose danger.

●

Observe the rules and regulations of the electrical installation and the methods described in the installation manual when
dealing with the electrical work. Use power cables approved by the authorities of your country.

●

Be sure to use the specified wire for connecting the indoor and outdoor units. Please ensure that the connections are tight
after the conductors of the wire are inserted into the terminals. Improper insertion and loose contact may cause over-heating
and fire.

●

Please use the specified components for installation work. Otherwise, the units may collapse or water leakage, electric shock
and fire may occur.

●

Be sure to use the specified piping set for R22. Otherwise, this may result in broken copper pipes or faults.

●

When installing or removing an air conditioner, do not allow air or moisture to remain in the refrigeration cycle. Otherwise,
pressure in the refrigeration cycle may become abnormally high so that a rupture may be caused.

●

Be sure to ventilate fully if a refrigerant gas leak while at work. If the refrigerant gas comes into contact with fire, a poisonous
gas may occur.

●

After completion of installation work, check to make sure that there is no refrigeration gas leakage. If the refrigerant gas leaks
into the room, coming into contact with fire in the fan-driven heater, space heater, etc., a poisonous gas may occur.

●

Unauthorized modifications to the air conditioner may be dangerous. If a breakdown occurs please call a qualified air conditioner
technician or electrician. Improper repairs may result in water leakage, electric shock and fire, etc.

Tools Needed For Installation Work

●

+ – Screwdriver

●

Saw ● ø 65mm Power Drill ● Hexagonal Wrench
Key ( 4mm)
Leakage Detector

●

Tape

Pliers ● Flare Tool

●

Measuring Tape

●

Wrench (14, 17, 24mm)

●

Pipe Cutter

●

Putty

●

Knife

●

Gas

●

Vinyl

●

A circuit breaker or fuse (20A time delay) must be installed. Without a circuit breaker or fuse the danger of electric shock
exists.
A main switch with a contact gap of more than 3mm has to be installed in the power supply line to the outdoor unit.

●

Do not install the unit near a 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.

●

Piping shall be suitable supported with a maximum spacing of 1m between the supports.

!

CAUTION

above 50mm

above 100mm

above

0.45m

above 300mm

must not bend

above 100mm

2,500mm or more

1

2

4

5

3

Maximum pipe length 15m

above 200mm

above 700mm

above 200mm

above 50mm when
installed on the
ceiling of balcony

(

)

above 100mm

above 100mm

give clearance as
wide as possible

Plug

7

THE CHOICE OF MOUNTING SITE (Please note the following matters and obtain permission from customer before installation).

!

!

Connection

Horizontally
perpendicular
to the unit

WARNING

●

The unit should be mounted at stable, non-vibratory location which
can provide full support to the unit.

CAUTION

●

No nearby heat source and no obstruction near the air outlet is
allowed.

●

The clearance distances from top, right and left are specified in
figure below.

●

The location must be convenient for water drainage and pipe
connection with the Outdoor unit.

●

To avoid interference from noise please place the unit and its
remote controller at least 1m from the radio, television and inverter

INDOOR UNIT

type fluorescent lamp.

●

To avoid any error in signal transmission from the remote controller,
please put the controller far away from high-frequency machines
and high-power wireless systems.

●

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

●

The Outdoor unit must be mounted at a location which can sup­port heavy weight. Otherwise, noise and vibration will increase.

●

Do not expose the unit under direct sunshine or rain. Besides,
ventilation must be good and clear of obstruction.

●

The air blown out of the unit should not point directly to animals
or plants.

●

The clearances of the unit from top, left, right and front are specified
in figure below. At least 3 of the above sides must be open air.

●

Be sure that the hot air blown out of the unit and noise do not
disturb the neighbourhood.

OUTDOOR UNIT

●

Do not install at a location where there is flammable gas, steam,
oil and smoke.

●

The location must be convenient for water drainage.

●

Place the Outdoor unit and its connecting cord at least 1m away
from the antenna or signal line of television, radio or telephone.
This is to avoid noise interference.

!

WARNING

!

CAUTION

Names of Indoor Components

Hanger

1

Screw for Hanger

2

Holder for Remote
Controller

3

AAA Size Battery

4

Screw for holder of
Remote Controller

5

Insulation pipe

6

Remote Controller

7

Purifying Filter

8

Names of Outdoor Components

Bush

9

Drain Pipe

0

(4.1x32)

(3.1x16)

The Length of Indoor Unit

QtyNo. Item

0.9m

1

6

There are 4 directions

1

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

Dimension of Mounting Stand

of the Outdoor unit

(unit : mm)

mounting stand

2

2

1

1

1

QtyNo. Item

4

1

Connecting Cord

1.6m

Direction of Piping

57

12
35

508

198

!

Figure showing the Installation
of Indoor and Outdoor Unit.

CAUTION

The installation height

•

of indoor unit must be

2.5m or more in a non
public area.

!

CAUTION

In case the pipe length is more than 8m, add refrigerant R22 at
25 gram per every meter exceeds. However, pipe length shall
not exceed 15m.

Be sure to
completely
seal any
gap with
putty.

10

320

340

20

(10)

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

The connection of insulated
drain hose.

inner diameter ø 16mm

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

above 50mm

above 100mm

above

0.45m

above 300mm

must not bend

above 100mm

2,500mm or more

1

2

4

5

3

Maximum pipe length 15m

above 200mm

above 700mm

above 200mm

above 50mm when
installed on the
ceiling of balcony

(

)

above 100mm

above 100mm

give clearance as
wide as possible

Plug

7

!

!

Connection

Horizontally
perpendicular
to the unit

Connecting cords,
pipe and drain hose
must be tied together
with Vinyl tape.

0.65m

about 15cm

Projection

Temporary stand

Bending
upwards

Condensed
water pond

Ditch

Condensed
water pond

1

Installation of Hanger, Wall Penetration and Installation of Protection Pipe

!

CAUTION

●

The draining of the water container inside the indoor unit can be done from the left.
Therefore the hanger must be fixed horizontally or slightly tilted towards the side of
drain hose. Otherwise, condensed water may overflow the water container.

Direct Mounting On The Wall

●

Please use hidden beams in the wall to hold the hanger.

External dimension of

indoor unit

180mm

180mm

298mm

45mm

Hanger

Line

Screw for Hanger

200mm

45mm

ø 65mm

30mm

1030mm

80mm

Drain Hose

Please use more
than 4 screws.

Procedures of Installation and Precautions

●

Procedures to fix the hanger.

1. Drill holes on wall. 2. Push plug into the holes. 3. Fix the hanger on wall
(As shown below) (As shown below) with 4.1 x 32 screw

Wall

ø4.8mm

INDOOR UNIT

32mm

●

Procedures to fix the holder of remote control.

1 Hanger

2 Screw

Wall

Plug

1. Drill holes on wall. 2. Push plug into the holes.
(As shown below) (As shown below)

Wall

ø4.4mm

Wall Penetration and Installation of Protection Pipe

●

Drill a ø 65mm hole on
wall which is slightly tilted
towards the outdoor side.
Drill the wall at a small
angle.

●

Cut the protection pipe
according to the wall
thickness.

●

Empty gap in the sleeve
of protection pipe should
be completely sealed
with putty to avoid
dripping of rain water into
the room.

20mm

3

Remote
Control
Holder

Seal with
putty

Protection
pipe

Plug

WALL

5 Screw

OutdoorIndoor

2 ~ 5mm

Seal with
putty

Sleeve of
protection
pipe

(As shown in figure below)

above 50mm

4.1 x 32 Screw

!

WARNING

Be sure that the wire is not
in contact with any metal
in the wall. Please use the
protection pipe as wire
passing through the hollow
part of the wall so as to
prevent the possibility of
damaged by mouse.
Unless it seals completely,
any air with high humidity
flows from outdoor and
any dew may drop.

Weight

Ceiling

Mark

Level

Hole for
pipe

2

Installation of the Indoor Unit

VERTICALLY DOWNWARD PIPING

Preparation

●

Connect connecting cord.

●

Pull out the pipe, connecting cord and drain hose.

Installation

●

The upper part of the Indoor unit is hanged on the hanger.

●

The projection at the lower part of the Indoor unit is hooked onto the hanger.

Hanger

Protection
Pipe

Drain Hose

Refrigerating
Pipe

Connecting
Cord

Lift the body
of the unit
upwards and
then force
it downwards.

Hanger

Projection

Hook

!

CAUTION

Please pull the lower part of
the Indoor unit outwards to
check if the unit is hooked
onto the hanger. Improper
installation may cause
vibration and noise.

HOW TO REMOVE INDOOR UNIT FROM HANGER

●

Pull down PULL section on the bottom of indoor
unit and pull it towards you, then claws are
released from hanger. (Indicated by 2 arrows in
the drawing on the right.)

●

When bottom face of indoor unit cannot be
pulled due to obstacles, etc. Remove front cover,
insert screw driver into circle hole, pull claws
down and pull indoor unit towards you.

●

Please check how to remove and attach front
cover in this instruction manual.

Screw driver

Circle hole

2

Claw of indoor unit

1

HORIZONTAL PIPING

Preparation

Change of Drain Hose and Installation Procedures.

●

Exchange the location of drain hose and drain cap during horizontal piping as shown in
figure below. Be sure to plug in the drain hose until the insulating material folds upon itself.

●

Please use pliers to pull out the drain cap.
(This is an easier way to remove the drain cap).

Drain hoseDrain cap

!

CAUTION

Drain cap

Please insert
until here

Condensed water may leak out if not inserted properly.

Drain hose

Please insert
until here

HORIZONTAL & DOWNWARD PIPING – MAKING OPENINGS

●

During horizontal or downward piping, use a knife to cut
openings as shown in figure. Then smoothen the edges of
openings with a file.

Pipe
support

Pull up the pipe after
bending downward

●

Turn the piping while holding down the lower
portion of pipe-support by hand.

Openings

INSTALLATION OF REFRIGERATING PIPES AFTER CONNECTION

●

The refrigerating pipes should be adjusted to fit into
the hole on the wall and then ready for further
connection.

●

The terminals of 2 connected pipes must be covered

Drain hose

with insulator used for terminal connection. Then the
pipes are wrapped with insulation pipe.

●

Connect the connecting cord after removing electrical
cover. (Refer to “CONNECTION OF POWER CORD”)

●

After adjustment, fit the connecting cord and pipes
into the space available under the indoor unit. Use
holder to hold them tight.

Pipe

Connecting cord

!

CAUTION

●

The rubber strap used for
fixing the insulator should
not be tied with great force.
Otherwise, this will damage

Holder

Insulation pipe (must be wrapped with

●

vinyl tape at every 120mm).

Holder can be attached at the either of 2 places.
Please select the easier position.

heat insulation and causes
water condensation.

Rubber strap tied with great force

Pipe

THE CONNECTION OF REFRIGERATING PIPE DURING THE
INSTALLATION OF INDOOR UNIT

Preparation To Install Refrigerating Pipes

●

The refrigerating pipes and connecting cord
transform and are attached.

●

The end of the refrigerating pipes are at locations
marked with “

 ” symbol.

Please bend at a small
radius to form an arc

Installation

Hang the Indoor unit onto the hanger. Use the temporary stand
at the back of the Indoor unit to push its lower part 15cm
forwards.

●

Place the drain hose through the hole on the wall.

●

Wrap the refrigerating pipes with insulation pipe after
connecting refrigerating pipe.

●

Connect the connecting cord after removing electrical cover.
(Refer to “Connection of Power Cord”)

●

After adjustment, the connecting cord and refrigerating pipes
are placed into the space available under the Indoor unit.

●

The projection of Indoor unit must hook to the hanger.

Heat insulation pipe

Connecting
cord

Refrigerating pipe

3

Installation of Drain Hose

You are free to choose the side (left or right) for the installation of drain

!

CAUTION

hose. Please ensure the smooth flow of condensed water of the Indoor
unit during installation. (Carelessness may result in water leakage.)

Pull this to the front
during the connection
of refrigerating pipes
to ease task.

!

CAUTION

●

Please fix in the plastic core
after flaring to avoid plastic
chips entering the pipes.

Protection

pipe

Drain hose

Connecting cord

!

CAUTION

Be sure that the
drain hose is not
loosely connected
or bend.

Holder

below
5mm

Connected
section

●

Please mount the Outdoor unit on stable ground to prevent vibration
and increase of noise level.

●

Decide the location for piping after sorting out the different types of
pipe available.

●

When removing side cover, please pull the handle after undoing the
hook by pulling it downward.

Please face this side (suction
side) of the unit to the wall.

Please remove side cover
when connecting the piping
and connecting cord.

Pull downward

CONDENSED WATER DISPOSAL OF OUTDOOR UNIT

 There are holes on the base of Outdoor unit for condensed

water to exhaust.

 In order to flow condensed water to the drain, the unit is installed on a

stand or a block so that the unit is 100mm above the ground as shown
figure. Join the drain pipe to one hole.

 At first insert one portion of the hook to the base (Portion A), then pull the

drain pipe in the direction shown by the arrow while inserting the hook

OUTDOOR UNIT

into the base. After installation, check whether the drain pipe cling to the
base firmly.

A

BASE

DRAIN PIPE

 When using in cold region, etc.

100 mm ABOVE

9

BUSH

10

DRAIN PIPE

In cold region with severe cold climate and heavy snow, water
discharged from heat exchanger freeze on the base surface and this
may affect drainage. In such a region, remove bush on the bottom face
of outdoor unit for better drainage. When using drainpipe, consult our
dealer.

1

Preparation of Pipe

●

Use a pipe cutter to cut the copper pipe.

Trimming tool

Copper pipe

!

CAUTION

●

Jagged edge will cause leakage.

●

Point the side to be trimmed downwards during trimming to prevent copper
chips from entering the pipe.

●

Before flaring, please put on the flare nut.

Die

Die

A

●

Please use exclusive
tool

Copper pipe

3

Removal Of Air From The Pipe And Gas Leakage Inspection

Procedures of using Vacuum Pump for Air Removal

When the meter reaches - 101KPa

As shown in right figure, remove the cap
of valve core. Then, connect the charge
hose. Remove the cap of valve head.

1

Connect the vacuum pump adapter to
the vacuum pump and connect the
charge hose to the adapter.

Fully tighten the “Hi” shuttle of the
manifold valve and completely unscrew
the “Lo” shuttle. Run the vacuum pump

2

for about 10–15 minutes, then completely
tighten the “Lo” shuttle and switch off
the vacuum pump.

(-76cmHg) during pumping, fully
tighten the shuttle.

Valve

When pumping starts, slightly loosen the
flare nut to check of air sucked in. Then
tighten the flare nut.

Meter showing pressure

Charge hose

Lo Hi

Valve

Vacuum pump
adapter

Closed

Manifold valve

Vacuum
pump

Outer
Diameter (mm)

6.35

12.7

2

Pipe Connection

Imperial flaring tool

1.5mm

0.8

~

1.0

2.0mm

~

A (mm)

Rigid flaring tool

0 ~ 0.5mm

1.0mm

0

~

In case of removing flare nut of an Indoor unit, first remove a nut

!

CAUTION

of small diameter side, or a seal cap of big diameter side will fly
out. Prevent water from entering into the piping when working.

●

Please be careful when bending the copper pipe.

●

Screw in manually while adjusting the center. After that, use of torque wrench to
tighten the connection.

INSTALLATION OF REFRIGERATING PIPES AND AIR REMOVAL

Wrench

Flare nut

Torque
wrench

Small dia. side
Large dia. side

Small dia. side

Valve

head cap
Valve core cap

Large dia. side

Outer

dia.of pipe

6.35 (1/4")

12.7 (1/2")

6.35 (1/4")

12.7 (1/2")

Torque N·m

(kgf · cm)

13.7 – 18.6 (140 – 190)

44.1 – 53.9 (450 – 550)

19.0 – 21.0 (194 ~ 214)

24.0 – 26.0 (245 ~ 265)

9.0 (92)

AIR REMOVAL

Completely unscrew the spindle of the
service valve (at 2 places) in anti-

3

clockwise direction to allow the flow of
coolant (using Hexagonal Wrench key).

Remove the charge hose and tighten the
cap of valve head. Check the cap’s

4

periphery if there is any gas leakage.
The task is then completed.

Gas Leakage Inspection

Please use gas leakage detector to check if leakage
occurs at the connection of Flare nut as shown on
the right.

If gas leakage occurs, further tighten the connection
to stop leakage.

Cap of valve head

The body of
service valve

Cap of

valve core
Hexagonal
Wrench Key

Cap of valve head

●

AUTO
RESTART
SWITCH

AUTO
RESTART
SWITCH

WARNING

!

THIS APPLIANCE MUST BE EARTHED.

Procedures of Wiring

In case that power is supplied from Indoor Unit

Indoor Unit

Line Cord

AC 220-240V

L

N

Outdoor Unit

2.0

Connecting Cord

Wiring Of The Indoor Unit

●

For wire connection of the Indoor unit, you need to remove front panel and electrical cover.

Method to remove front panel

●

Refer to “FINAL STAGE OF INSTALLATION – How to Remove The Front Cover”.

Method to remove electrical cover

●

Remove the screw and electrical cover.

●

Insert the connecting cord (A, B, C, D) from the bottom of unit.

●

Fixed the wire to terminal wires firmly as shown in figure at right side.

DCBADCBA

Electrical cover

Screw

Connect the
earth cord

ON

OFF

ABCD

1.6 or 2.0

Power line Control line

30mm

10mm

Indoor

Unit

10mm

70mm

25mm

Strip wires

Outdoor

Unit

CONNECTION OF POWER CORD

GRN + YEL

10mm

10mm

35mm

!

WARNING

●

The naked part of the wire core should be 10 mm and fix it to the terminal tightly. Then try to pull the
individual wire to check if the contact is tight. Improper insertion may burn the terminal.

●

Be sure to use only power cables approved from the authorities in your country. For example in Germany:
Cable type: NYM 3x1.5mm

●

Please refer to the installation manual for wire connection to the terminals of the units. The cabling must

2

, (fuse = 20A time delay)

meet the standards of electrical installation.

●

There is a AC voltage of 240V between the L and N terminals. Therefore, before servicing, be sure to
remove the plug from the AC outlet or switch off the main switch.

30mm

10mm

GRN + YEL

25mm

10mm

Screw

Wiring of The Outdoor Unit

●

Please remove the side cover for wire connection.

●

If you cannot attach the side cover due to the connecting cord, press

!

WARNING

the connecting cord in direction to the front panel to fix it.

●

Be sure that the hooks of the side cover is fixed in certainly. Otherwise
water leakage may occur and this causes short circuit or faults.

●

The connecting cord should not touch to service valve and pipes. (It
becomes high temperature in heating operation.)

Checking for the electric source and
the voltage range

●

Before installation, the power source must be checked and necessary
wiring work must be completed. To make the wiring capacity proper, use
the wire gauges list below for the lead-in from a pole transformer and for
the wiring from a switch board of fuse box to the main switch and outdoor
unit in consideration of the locked rotor current.

IMPORTANT

Cable length

up to 16m
up to 15m
up to 25m

Wire cross-section

2

1.5mm

2

2.5mm

2

4.0mm

After remove the screw
and band, put the
connecting cords and fix
the band with screw.

CD

B

A

Earth terminal

●

Investigate the power supply capacity and other electrical conditions at
the installation location.
Depending on the model of room air conditioner to be installed, request
the customer to make arrangements for the necessary electrical work
etc.
The electrical work includes the wiring work up the outdoor. In localities
where electrical conditions are poor, use of a voltage regulation is
recommended.

IMPORTANT

Fuse Capacity

20A time delay fuse

1

AUTO
RESTART
SWITCH

AUTO
RESTART
SWITCH

Insulation And Maintenance Of Pipe Connection

●

The connected terminals should be completely sealed with
heat insulator and then tied up with rubber strap.

●

Please tie the pipe and power line together with vinyl tape as
shown in the figure showing the installation of Indoor and
Outdoor units. Then fix their position with holders.

●

To enchance the heat insulation and to prevent water
condensation, please cover the outdoor part of the drain hose
and pipe with insulation pipe.

●

Completely seal any gap with putty.

Insulation material for pipe connection

Sleeve of
protection pipe

Putty

Putty

3

Power Source And Operation Test

Power Source

FINAL STAGE OF INSTALLATION

●

Please use a new socket. Accident may occur due to the use of old
socket because of poor contact.

●

Please plug in and then remove the plug for 2 – 3 times. This is to
ensure that the plug is completely plugged into the socket.

●

Keep additional length for the power cord and do not render the
plug under external force as this may cause poor contact.

●

Do not fix the power cord with U-shape nail.

!

CAUTION

2

Installation Of Remote Controller

●

The remote controller can be placed in its holder which is
fixed on wall or beam.

●

To operate the remote controller at its holder, please ensure
that the unit can receive signal transmitted from the controller
at the place where the holder is to be fixed. The unit will beep
when signal is received from the remote controller. The signal
transmission is weaken by the fluorescent light. Therefore,
during the installation of the remote control holder, please
switch on the light, even during day time, to determine the
mounting location of the holder.

The controller must
be hooked onto the
hook at the lower
part of the holder.

Screw (2 pieces)

Push in the remote
controller in the
direction as shown
in figure below.

Remote

Controller

Holder for
Remote Controller

Operation Test

●

Please ensure that the air conditioner is in normal
operating condition during the operation test.

●

Explain to your customer the proper operation
procedures as described in the user’s manual.

How to Remove The Front Cover

1 Remove the front panel.

●

Please remove and attach the front panel by both hands.

●

After opening the front panel by both hands.

11

1

Undo the right arm while pushing it inside.

11
22

2

Slide the front panel to right as shown in figure. Then

22

remove while pulling it to front.
2 Remove the filters.
3 Remove the caps and screws at the lower portion of the

front cover.

4 Pull the front cover upward as far as the location where

the lower portion of the front cover is on the deflector.

5 Remove while pulling the front cover in direction to arrow

as shown in figure to hold the both sides of front cover.

2

Cap

Screw

Lower portion of front cover

1

Deflector

How to Attach the Front Cover

11

1

After covering the front cover to the unit, certainly hook at

11

the upper portion (three places). Then, check that the drain
pan is certainly attached. Push the center of front cover in
the direction of arrow.

22

2

Fix the front cover at lower portion by screws and attach

22

the caps.

33

3

Attach the front panel.

33

●

Certainly insert the left shaft of the front panel to the hole
of the front cover. Next insert the right shaft as same as
the left.

44

4

Attach the filters which are placed the surface written

44

“FRONT” up.

●

After attaching the filters, push the front panel at three
arrow portion as shown in figure and close it.

Hole

Shaft

Guide

above 50mm

above 100mm

above

0.45m

above 300mm

must not bend

above 100mm

2,500mm or more

1

2

4

5

3

Maximum pipe length 15m

Minimum pipe length 5m

above 200mm

above 700mm

above 200mm

above 50mm when
installed on the
ceiling of balcony

(

)

above 100mm

above 100mm

give clearance as
wide as possible

Plug

7

FOR SERVICE PERSONNEL ONLY

!

!

Connection

Horizontally
perpendicular
to the unit

●

Carefully read through the procedures of proper
installation before starting installation work.

●

The sales agent should inform customers regarding
the correct operation of installation.

SPLIT UNIT AIR CONDITIONER

INSTALLATION MANUAL

Indoor Unit Outdoor Unit
RAS-24CH2 RAC-24CH2

SAFETY PRECAUTION

●

Read the safety precautions carefully before operating the unit.

●

The contents of this section are vital to ensure safety. Please pay special attention to the following sign.

WARNING ........ Incorrect methods of installation may cause death or serious injury.

!
!

CAUTION ......... Improper installation may result in serious consequence.

Be sure that the unit operates in proper condition after installation. Explain to customer the proper way of operating
the unit as described in the user’s guide.

!

WARNING

●

Please request your sales agent or qualified technician to install your unit. Water leakage, short circuit or fire may occur if you
do the installation work yourself.

●

Please observe the instructions stated in the installation manual during the process of installation. Improper installation may
cause water leakage, electric shock and fire.

●

Make sure that the units are mounted at locations which are able to provide full support to the weight of the units. If not, the
units may collapse and impose danger.

●

Observe the rules and regulations of the electrical installation and the methods described in the installation manual when
dealing with the electrical work. Use power cables approved by the authorities of your country.

●

Be sure to use the specified wire for connecting the indoor and outdoor units. Please ensure that the connections are tight
after the conductors of the wire are inserted into the terminals. Improper insertion and loose contact may cause over-heating
and fire.

●

Please use the specified components for installation work. Otherwise, the units may collapse or water leakage, electric shock
and fire may occur.

●

Be sure to use the specified piping set for R22. Otherwise, this may result in broken copper pipes or faults.

●

When installing or removing an air conditioner, do not allow air or moisture to remain in the refrigeration cycle. Otherwise,
pressure in the refrigeration cycle may become abnormally high so that a rupture may be caused.

●

Be sure to ventilate fully if a refrigerant gas leak while at work. If the refrigerant gas comes into contact with fire, a poisonous
gas may occur.

●

After completion of installation work, check to make sure that there is no refrigeration gas leakage. If the refrigerant gas leaks
into the room, coming into contact with fire in the fan-driven heater, space heater, etc., a poisonous gas may occur.

●

Unauthorized modifications to the air conditioner may be dangerous. If a breakdown occurs please call a qualified air conditioner
technician or electrician. Improper repairs may result in water leakage, electric shock and fire, etc.

Tools Needed For Installation Work

●

+ – Screwdriver

●

Saw ● ø 65mm Power Drill ● Hexagonal Wrench
Key ( 4mm)
Leakage Detector

●

Tape

Pliers ● Flare Tool

●

Measuring Tape

●

Wrench (14, 17, 27mm)

●

Pipe Cutter

●

Putty

●

Knife

●

Gas

●

Vinyl

●

A circuit breaker or fuse (30A time delay) must be installed. Without a circuit breaker or fuse the danger of electric shock
exists.
A main switch with a contact gap of more than 3mm has to be installed in the power supply line to the outdoor unit.

●

Do not install the unit near a 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.

●

Piping shall be suitable supported with a maximum spacing of 1m between the supports.

!

CAUTION

above 50mm

above 100mm

above

0.45m

above 300mm

must not bend

above 100mm

2,500mm or more

1

2

4

5

3

Maximum pipe length 15m

Minimum pipe length 5m

above 200mm

above 700mm

above 200mm

above 50mm when
installed on the
ceiling of balcony

(

)

above 100mm

above 100mm

give clearance as
wide as possible

Plug

7

THE CHOICE OF MOUNTING SITE (Please note the following matters and obtain permission from customer before installation).

!

!

Connection

Horizontally
perpendicular
to the unit

WARNING

●

The unit should be mounted at stable, non-vibratory location which
can provide full support to the unit.

CAUTION

●

No nearby heat source and no obstruction near the air outlet is
allowed.

●

The clearance distances from top, right and left are specified in
figure below.

●

The location must be convenient for water drainage and pipe
connection with the Outdoor unit.

●

To avoid interference from noise please place the unit and its
remote controller at least 1m from the radio, television and inverter

INDOOR UNIT

type fluorescent lamp.

●

To avoid any error in signal transmission from the remote controller,
please put the controller far away from high-frequency machines
and high-power wireless systems.

●

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

●

The Outdoor unit must be mounted at a location which can sup­port heavy weight. Otherwise, noise and vibration will increase.

●

Do not expose the unit under direct sunshine or rain. Besides,
ventilation must be good and clear of obstruction.

●

The air blown out of the unit should not point directly to animals
or plants.

●

The clearances of the unit from top, left, right and front are specified
in figure below. At least 3 of the above sides must be open air.

●

Be sure that the hot air blown out of the unit and noise do not
disturb the neighbourhood.

OUTDOOR UNIT

●

Do not install at a location where there is flammable gas, steam,
oil and smoke.

●

The location must be convenient for water drainage.

●

Place the Outdoor unit and its connecting cord at least 1m away
from the antenna or signal line of television, radio or telephone.
This is to avoid noise interference.

!

WARNING

!

CAUTION

Names of Indoor Components

Hanger

1

Screw for Hanger

2

Holder for Remote
Controller

3

AAA Size Battery

4

Screw for holder of
Remote Controller

5

Insulation pipe

6

Remote Controller

7

Purifying Filter

8

Names of Outdoor Components

Bush

9

Drain Pipe

0

(4.1x32)

(3.1x16)

The Length of Indoor Unit

QtyNo. Item

0.9m

1

Direction of Piping

6

There are 4 directions

1

allowed, namely, horizontally
perpendicular to the unit,
vertically down from right,
horizontally out from right and
horizontally out to left.

2

Don’t form the piping
downward at the left of the unit.

Dimension of Mounting Stand

2

of the Outdoor unit

(unit : mm)

mounting stand

1

1

1

QtyNo. Item

4

1

Connecting Cord

57

12
35

508

198

1.6m

20

!

Figure showing the Installation
of Indoor and Outdoor Unit.

CAUTION

The installation height

•

of indoor unit must be

2.5m or more in a non
public area.

!

CAUTION

In case the pipe length is more than 8m, add refrigerant R22 at
30 gram per every meter exceeds. However, pipe length shall
not exceed 15m.

Be sure to
completely
seal any
gap with
putty.

10

320

340

(10)

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

The connection of insulated
drain hose.

inner diameter ø 16mm

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

above 50mm

above 100mm

above

0.45m

above 300mm

must not bend

above 100mm

2,500mm or more

1

2

4

5

3

Maximum pipe length 15m

Minimum pipe length 5m

above 200mm

above 700mm

above 200mm

above 50mm when
installed on the
ceiling of balcony

(

)

above 100mm

above 100mm

give clearance as
wide as possible

Plug

7

!

!

Connection

Horizontally
perpendicular
to the unit

Connecting cords,
pipe and drain hose
must be tied together
with Vinyl tape.

0.65m

about 15cm

Projection

Temporary stand

Bending
upwards

Condensed
water pond

Ditch

Condensed
water pond

1

Installation of Hanger, Wall Penetration and Installation of Protection Pipe

!

CAUTION

●

The draining of the water container inside the indoor unit can be done from the left.
Therefore the hanger must be fixed horizontally or slightly tilted towards the side of
drain hose. Otherwise, condensed water may overflow the water container.

Direct Mounting On The Wall

●

Please use hidden beams in the wall to hold the hanger.

External dimension of

indoor unit

180mm

180mm

298mm

45mm

Hanger

Line

Screw for Hanger

200mm

45mm

ø 65mm

30mm

1030mm

80mm

Drain Hose

Please use more
than 4 screws.

Procedures of Installation and Precautions

●

Procedures to fix the hanger.

1. Drill holes on wall. 2. Push plug into the holes. 3. Fix the hanger on wall
(As shown below) (As shown below) with 4.1 x 32 screw

Wall

ø4.8mm

INDOOR UNIT

32mm

●

Procedures to fix the holder of remote control.

1 Hanger

2 Screw

Wall

Plug

1. Drill holes on wall. 2. Push plug into the holes.
(As shown below) (As shown below)

Wall

ø4.4mm

Wall Penetration and Installation of Protection Pipe

●

Drill a ø 65mm hole on
wall which is slightly tilted
towards the outdoor side.
Drill the wall at a small
angle.

●

Cut the protection pipe
according to the wall
thickness.

●

Empty gap in the sleeve
of protection pipe should
be completely sealed
with putty to avoid
dripping of rain water into
the room.

20mm

3

Remote
Control
Holder

Seal with
putty

Protection
pipe

Plug

WALL

5 Screw

OutdoorIndoor

Seal with
putty

Sleeve of
protection
pipe

2 ~ 5mm

(As shown in figure below)

above 50mm

4.1 x 32 Screw

!

WARNING

Be sure that the wire is not
in contact with any metal
in the wall. Please use the
protection pipe as wire
passing through the hollow
part of the wall so as to
prevent the possibility of
damaged by mouse.
Unless it seals completely,
any air with high humidity
flows from outdoor and
any dew may drop.

Weight

Ceiling

Mark

Level

Hole for
pipe

2

Installation of the Indoor Unit

VERTICALLY DOWNWARD PIPING

Preparation

●

Connect connecting cord.

●

Pull out the pipe, connecting cord and drain hose.

Installation

●

The upper part of the Indoor unit is hanged on the hanger.

●

The projection at the lower part of the Indoor unit is hooked onto the hanger.

Hanger

Protection
Pipe

Drain Hose

Refrigerating
Pipe

Connecting
Cord

Lift the body
of the unit
upwards and
then force
it downwards.

Hanger

Projection

Hook

!

CAUTION

Please pull the lower part of
the Indoor unit outwards to
check if the unit is hooked
onto the hanger. Improper
installation may cause
vibration and noise.

HOW TO REMOVE INDOOR UNIT FROM HANGER

●

Pull down PULL section on the bottom of indoor
unit and pull it towards you, then claws are
released from hanger. (Indicated by 2 arrows in
the drawing on the right.)

●

When bottom face of indoor unit cannot be
pulled due to obstacles, etc. Remove front cover,
insert screw driver into circle hole, pull claws
down and pull indoor unit towards you.

●

Please check how to remove and attach front
cover in this instruction manual.

Screw driver

Circle hole

2

Claw of indoor unit

1

HORIZONTAL PIPING

Preparation

Change of Drain Hose and Installation Procedures.

●

Exchange the location of drain hose and drain cap during horizontal piping as shown in
figure below. Be sure to plug in the drain hose until the insulating material folds upon itself.

●

Please use pliers to pull out the drain cap.
(This is an easier way to remove the drain cap).

Drain hoseDrain cap

!

CAUTION

Drain cap

Please insert
until here

Condensed water may leak out if not inserted properly.

Drain hose

Please insert
until here

HORIZONTAL & DOWNWARD PIPING – MAKING OPENINGS

●

During horizontal or downward piping, use a knife to cut
openings as shown in figure. Then smoothen the edges of
openings with a file.

Pipe
support

Pull up the pipe after
bending downward

●

Turn the piping while holding down the lower
portion of pipe-support by hand.

Openings

INSTALLATION OF REFRIGERATING PIPES AFTER CONNECTION

●

The refrigerating pipes should be adjusted to fit into
the hole on the wall and then ready for further
connection.

●

The terminals of 2 connected pipes must be covered

Drain hose

with insulator used for terminal connection. Then the
pipes are wrapped with insulation pipe.

●

Connect the connecting cord after removing electrical
cover. (Refer to “CONNECTION OF POWER CORD”)

●

After adjustment, fit the connecting cord and pipes
into the space available under the indoor unit. Use
holder to hold them tight.

Pipe

Connecting cord

!

CAUTION

●

The rubber strap used for
fixing the insulator should
not be tied with great force.
Otherwise, this will damage

Holder

Insulation pipe (must be wrapped with

●

vinyl tape at every 120mm).

Holder can be attached at the either of 2 places.
Please select the easier position.

heat insulation and causes
water condensation.

Rubber strap tied with great force

Pipe

THE CONNECTION OF REFRIGERATING PIPE DURING THE
INSTALLATION OF INDOOR UNIT

Preparation To Install Refrigerating Pipes

●

The refrigerating pipes and connecting cord
transform and are attached.

●

The end of the refrigerating pipes are at locations
marked with “



” symbol.

Please bend at a small
radius to form an arc

Installation

Hang the Indoor unit onto the hanger. Use the temporary stand
at the back of the Indoor unit to push its lower part 15cm
forwards.

●

Place the drain hose through the hole on the wall.

●

Wrap the refrigerating pipes with insulation pipe after
connecting refrigerating pipe.

●

Connect the connecting cord after removing electrical cover.
(Refer to “Connection of Power Cord”)

●

After adjustment, the connecting cord and refrigerating pipes
are placed into the space available under the Indoor unit.

●

The projection of Indoor unit must hook to the hanger.

Heat insulation pipe

Connecting
cord

Refrigerating pipe

3

Installation of Drain Hose

You are free to choose the side (left or right) for the installation of drain

!

CAUTION

hose. Please ensure the smooth flow of condensed water of the Indoor
unit during installation. (Carelessness may result in water leakage.)

Pull this to the front
during the connection
of refrigerating pipes
to ease task.

!

CAUTION

●

Please fix in the plastic core
after flaring to avoid plastic
chips entering the pipes.

Protection

pipe

Drain hose

Connecting cord

!

CAUTION

Be sure that the
drain hose is not
loosely connected
or bend.

Holder

below
5mm

Connected
section

●

Please mount the Outdoor unit on stable ground to prevent vibration
and increase of noise level.

●

Decide the location for piping after sorting out the different types of
pipe available.

●

When removing side cover, please pull the handle after undoing the
hook by pulling it downward.

Please face this side (suction
side) of the unit to the wall.

Please remove side cover
when connecting the piping
and connecting cord.

Pull downward

CONDENSED WATER DISPOSAL OF OUTDOOR UNIT

 There are holes on the base of Outdoor unit for condensed

water to exhaust.

 In order to flow condensed water to the drain, the unit is installed on a

stand or a block so that the unit is 100mm above the ground as shown
figure. Join the drain pipe to one hole.

 At first insert one portion of the hook to the base (Portion A), then pull the

drain pipe in the direction shown by the arrow while inserting the hook

OUTDOOR UNIT

into the base. After installation, check whether the drain pipe cling to the
base firmly.

A

BASE

DRAIN PIPE

 When using in cold region, etc.

100 mm ABOVE

9

BUSH

10

DRAIN PIPE

In cold region with severe cold climate and heavy snow, water
discharged from heat exchanger freeze on the base surface and this
may affect drainage. In such a region, remove bush on the bottom face
of outdoor unit for better drainage. When using drainpipe, consult our
dealer.

1

Preparation of Pipe

●

Use a pipe cutter to cut the copper pipe.

Trimming tool

Copper pipe

!

CAUTION

●

Jagged edge will cause leakage.

●

Point the side to be trimmed downwards during trimming to prevent copper
chips from entering the pipe.

●

Before flaring, please put on the flare nut.

Die

Die

A

●

Please use exclusive
tool

Copper pipe

3

Removal Of Air From The Pipe And Gas Leakage Inspection

Procedures of using Vacuum Pump for Air Removal

When the meter reaches - 101KPa

As shown in right figure, remove the cap
of valve core. Then, connect the charge
hose. Remove the cap of valve head.

1

Connect the vacuum pump adapter to
the vacuum pump and connect the
charge hose to the adapter.

Fully tighten the “Hi” shuttle of the
manifold valve and completely unscrew
the “Lo” shuttle. Run the vacuum pump

2

for about 10–15 minutes, then completely
tighten the “Lo” shuttle and switch off
the vacuum pump.

(-76cmHg) during pumping, fully
tighten the shuttle.

Valve

When pumping starts, slightly loosen the
flare nut to check of air sucked in. Then
tighten the flare nut.

Meter showing pressure

Charge hose

Lo Hi

Valve

Vacuum pump
adapter

Closed

Manifold valve

Vacuum
pump

Outer
Diameter (mm)

6.35

15.88

2

Pipe Connection

Imperial flaring tool

1.5mm

0.8

~

1.0

2.0mm

~

A (mm)

Rigid flaring tool

0 ~ 0.5mm

1.0mm

0

~

In case of removing flare nut of an Indoor unit, first remove a nut

!

CAUTION

of small diameter side, or a seal cap of big diameter side will fly
out. Prevent water from entering into the piping when working.

●

Please be careful when bending the copper pipe.

●

Screw in manually while adjusting the center. After that, use of torque wrench to
tighten the connection.

INSTALLATION OF REFRIGERATING PIPES AND AIR REMOVAL

Wrench

Flare nut

Torque
wrench

Small dia. side

Large dia. side

Small dia. side

Valve

head cap

Valve core cap

Large dia. side

Outer

dia.of pipe

6.35 (1/4")

15.88 (5/8")

6.35 (1/4")

15.88 (5/8")

Torque N·m

(kgf · cm)

13.7 – 18.6 (140 – 190)
49 – 58.8 (500 – 600)

19.0 – 21.0 (194 ~ 214)

29.0 – 31.0 (296 ~ 316)

9.0 (92)

AIR REMOVAL

Completely unscrew the spindle of the
service valve (at 2 places) in anti-

3

clockwise direction to allow the flow of
coolant (using Hexagonal Wrench key).

Remove the charge hose and tighten the
cap of valve head. Check the cap’s

4

periphery if there is any gas leakage.
The task is then completed.

Gas Leakage Inspection

Please use gas leakage detector to check if leakage
occurs at the connection of Flare nut as shown on
the right.

If gas leakage occurs, further tighten the connection
to stop leakage.

Cap of valve head

The body of
service valve

Cap of

valve core
Hexagonal
Wrench Key

Cap of valve head

●

AUTO
RESTART
SWITCH

AUTO
RESTART
SWITCH

WARNING

!

THIS APPLIANCE MUST BE EARTHED.

Procedures of Wiring

In case that power is supplied from Indoor Unit

Indoor Unit

Line Cord

AC 220-240V

L
N

Outdoor Unit

2.0

Connecting Cord

Wiring Of The Indoor Unit

●

For wire connection of the Indoor unit, you need to remove front panel and electrical cover.

Method to remove front panel

●

Refer to “FINAL STAGE OF INSTALLATION – How to Remove The Front Cover”.

Method to remove electrical cover

●

Remove the screw and electrical cover.

●

Insert the connecting cord (A, B, C, D) from the bottom of unit.

●

Fixed the wire to terminal wires firmly as shown in figure at right side.

DCBADCBA

Electrical cover

Screw

Connect the
earth cord

ON

OFF

ABCD

1.6 or 2.0

Power line Control line

30mm

10mm

Indoor

Unit

10mm

70mm

25mm

Strip wires

Outdoor

Unit

CONNECTION OF POWER CORD

GRN + YEL

10mm

10mm

35mm

!

WARNING

●

The naked part of the wire core should be 10 mm and fix it to the terminal tightly. Then try to pull the
individual wire to check if the contact is tight. Improper insertion may burn the terminal.

●

Be sure to use only power cables approved from the authorities in your country. For example in Germany:
Cable type: NYM 3x1.5mm

●

Please refer to the installation manual for wire connection to the terminals of the units. The cabling must

2

, (fuse = 30A time delay)

meet the standards of electrical installation.

●

There is a AC voltage of 240V between the L and N terminals. Therefore, before servicing, be sure to
remove the plug from the AC outlet or switch off the main switch.

30mm

10mm

GRN + YEL

25mm

10mm

Screw

Wiring of The Outdoor Unit

●

Please remove the side cover for wire connection.

●

If you cannot attach the side cover due to the connecting cord, press

!

WARNING

the connecting cord in direction to the front panel to fix it.

●

Be sure that the hooks of the side cover is fixed in certainly. Otherwise
water leakage may occur and this causes short circuit or faults.

●

The connecting cord should not touch to service valve and pipes. (It
becomes high temperature in heating operation.)

Checking for the electric source and
the voltage range

●

Before installation, the power source must be checked and necessary
wiring work must be completed. To make the wiring capacity proper, use
the wire gauges list below for the lead-in from a pole transformer and for
the wiring from a switch board of fuse box to the main switch and outdoor
unit in consideration of the locked rotor current.

IMPORTANT

Cable length

up to 16m
up to 15m
up to 25m

Wire cross-section

2

1.5mm

2

2.5mm

2

4.0mm

After remove the screw
and band, put the
connecting cords and fix
the band with screw.

CD

B

A

Earth terminal

●

Investigate the power supply capacity and other electrical conditions at
the installation location.
Depending on the model of room air conditioner to be installed, request
the customer to make arrangements for the necessary electrical work
etc.
The electrical work includes the wiring work up the outdoor. In localities
where electrical conditions are poor, use of a voltage regulation is
recommended.

IMPORTANT

Fuse Capacity

30A time delay fuse

1

AUTO
RESTART
SWITCH

AUTO
RESTART
SWITCH

Insulation And Maintenance Of Pipe Connection

●

The connected terminals should be completely sealed with
heat insulator and then tied up with rubber strap.

●

Please tie the pipe and power line together with vinyl tape as
shown in the figure showing the installation of Indoor and
Outdoor units. Then fix their position with holders.

●

To enchance the heat insulation and to prevent water
condensation, please cover the outdoor part of the drain hose
and pipe with insulation pipe.

●

Completely seal any gap with putty.

Insulation material for pipe connection

Sleeve of
protection pipe

Putty

Putty

3

Power Source And Operation Test

Power Source

FINAL STAGE OF INSTALLATION

●

Please use a new socket. Accident may occur due to the use of old
socket because of poor contact.

●

Please plug in and then remove the plug for 2 – 3 times. This is to
ensure that the plug is completely plugged into the socket.

●

Keep additional length for the power cord and do not render the
plug under external force as this may cause poor contact.

●

Do not fix the power cord with U-shape nail.

!

CAUTION

2

Installation Of Remote Controller

●

The remote controller can be placed in its holder which is
fixed on wall or beam.

●

To operate the remote controller at its holder, please ensure
that the unit can receive signal transmitted from the controller
at the place where the holder is to be fixed. The unit will beep
when signal is received from the remote controller. The signal
transmission is weaken by the fluorescent light. Therefore,
during the installation of the remote control holder, please
switch on the light, even during day time, to determine the
mounting location of the holder.

The controller must
be hooked onto the
hook at the lower
part of the holder.

Screw (2 pieces)

Push in the remote
controller in the
direction as shown
in figure below.

Remote

Controller

Holder for
Remote Controller

Operation Test

●

Please ensure that the air conditioner is in normal
operating condition during the operation test.

●

Explain to your customer the proper operation
procedures as described in the user’s manual.

How to Remove The Front Cover

1 Remove the front panel.

●

Please remove and attach the front panel by both hands.

●

After opening the front panel by both hands.

11

1

Undo the right arm while pushing it inside.

11
22

2

Slide the front panel to right as shown in figure. Then

22

remove while pulling it to front.
2 Remove the filters.
3 Remove the caps and screws at the lower portion of the

front cover.

4 Pull the front cover upward as far as the location where

the lower portion of the front cover is on the deflector.

5 Remove while pulling the front cover in direction to arrow

as shown in figure to hold the both sides of front cover.

2

Cap

Screw

Lower portion of front cover

1

Deflector

How to Attach the Front Cover

11

1

After covering the front cover to the unit, certainly hook at

11

the upper portion (three places). Then, check that the drain
pan is certainly attached. Push the center of front cover in
the direction of arrow.

22

2

Fix the front cover at lower portion by screws and attach

22

the caps.

33

3

Attach the front panel.

33

●

Certainly insert the left shaft of the front panel to the hole
of the front cover. Next insert the right shaft as same as
the left.

44

4

Attach the filters which are placed the surface written

44

“FRONT” up.

●

After attaching the filters, push the front panel at three
arrow portion as shown in figure and close it.

Hole

Shaft

Guide

Hitachi, Ltd. Tokyo, Japan

International Sales Division

THE HITACHI ATAGO BUILDING,

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Minato – Ku, Tokyo 105-8430, Japan.

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