Toshiba RAS-18SKPX, RAS-24S2AX, RAS-18S2AX, RAS-18SKPX-V, RAS-24SKPX Service Manual

SERVICE MANUAL

AIR CONDITIONER

RAS-18SKPX / RAS-18S2AX

RAS-24SKPX / RAS-24S2AX

FILE NO. SVM-08032-1

SPLIT WALL TYPE

RAS-18SKPX-V / RAS-18S2AX-V

RAS-18SKP-E / RAS-18S2A-E
RAS-24SKP-E / RAS-24S2A-E

24 Class18 Class

Revised May, 2008

CONTENTS

1. SPECIFICATIONS

2. CONSTRUCTION VIEWS

2-1 Indoor Unit
2-2 Outdoor Unit (18Class)

2-3 Outdoor Unit (24Class)

3. WIRING DIAGRAM

3-1

RAS-18SKPX / RAS-18S2AX, RAS-18SKPX-V / RAS-18S2AX-V,
RAS-18SKP-E / RAS-18S2A-E

RAS-24SKPX / RAS-24S2AX, RAS-24SKP-E / RAS-24S2A-E

3-2

4. SPECIFICATION OF ELECTRICAL PARTS

4-1 Indoor Unit (RAS-18SKPX, RAS-18SKPX-V, RAS-18SKP-E)
4-2

Outdoor Unit (RAS-18S2AX, RAS-18S2AX-V, RAS-18S2A-E)
Indoor Unit (RAS-24SKPX, RAS-24SKP-E)

4-3

Outdoor Unit (RAS-24S2AX, RAS-24S2A-E)

4-4

FILE NO. SVM-08032

5. REFRIGERATION CYCLE DIAGRAM

5-1

RAS-18SKPX / RAS-18S2AX, RAS-18SKPX-V / RAS-18S2AX-V
RAS-18SKP-E / RAS-18S2A-E

RAS-24SKPX / RAS-24S2AX, RAS-24SKP-E / RAS-24S2A-E

5-2

6. CONTROL BLOCK DIAGRAM

7. OPERATION DESCRIPTION

7-1 Remote control
7-2 Outline of Air Conditioner Control

7-3 Description of Operation Circuit
7-4 Description of Safety and Reliability Prevention Function
7-5 One-Touch Operation
7-6 Hi POWER Operation
7-7 QUIET Operation
7-8 ECO Operation
7-9 COMFORT SLEEP Operation
7-10 FILTER Check lamp
7-11 Auto Restart Function
7-12 Self-Cleaning Operation

– 1 –

8. INSTALLATION PROCEDURE

8-1 Safety Cautions
8-2 Installation Diagram of Indoor and Outdoor Units
8-3 Installation
8-4 Indoor Unit
8-5 Outdoor Unit
8-6 Test Operation

9. TROUBLESHOOTING CHART

9-1 Troubleshooting Procedure
9-2 Basic Check Items
9-3 Primary Judgement
9-4 Self-Diagnosis by Remote Control (Check Code)

9-5 Troubleshooting for Indoor Unit
9-6 Troubleshooting for Wiring (Interconnect cable and Serial Signal Wire)
9-7 Troubleshooting for P.C. Board
9-8 Troubleshooting for Remote Control

FILE NO. SVM-08032

10. PARTS REPLACEMENT

10-1 Indoor Unit

Outdoor Unit (RAS-18S2AX, RAS-18S2AX-V, RAS-18S2A-E)

10-2
10-3

Outdoor Unit (RAS-24S2AX, RAS-24S2A-E)

11. EXPLODED VIEWS AND PARTS LIST

11-1 Indoor Unit (E - Parts Assy)
11-2 Indoor Unit
11-3

Outdoor Unit (RAS-18S2AX, RAS-18S2AX-V, RAS-18S2A-E)

11-4

Outdoor Unit (RAS-24S2AX, RAS-24S2A-E)

− 2 −

1. SPECIFICATIONS

FILE NO. SVM-08032

MODEL

ITEM Cooling Cooling

Capacity kW

Power source V 220 – 240

Power consumption W 1860 1940 1860 1940
Power factor % 97 91 97 91

Phase 1∅

Hz 50

RAS-18SKPX / RAS-18S2AX

RAS-18SKP-E / RAS-18S2A-E

220 V 240 V 220 V 240 V

5.20 5.25 5.20 5.25

RAS-18SKPX-V

RAS-18S2AX-V

Running current A

Indoor/Outdoor
Starting current A 42
Moisture removal lit/h 2

Noise

Refrigerant

Refrigerant control Capillary tube

Interconnection Connection type Flare connection
pipe Maximum length

INDOOR UNIT RAS-18SKPX, RAS-18SKP-E RAS-18SKPX-V

Dimensions Width mm 1050

Net weight kg 14
Evaporator type Finned tube
Indoor fan type Cross flow fan

Air volume Medium fan m3/h 800

Fan motor output W 30
Air filter Honeycomb woven filter with PP frame

OUTDOOR UNIT RAS-18S2AX, RAS-18S2A-E RAS-18S2AX-V

Dimensions Width mm

Net weight kg 39
Condenser type Finned tube

Outdoor fan type Propeller fan

Airflow volume m3/h

Fan motor output W

Compressor

Safety device IOL
Louver type Automatic louver
Usable outdoor temperature range °C 21 ~ 43

Note *1 Chargeless pipe

*2 Maximum pipe

Indoor (H/M/L) dB
Outdoor (220 – 240 V) dB 51 52 51 52
Name of refrigerant R22
Rated amount kg 1.23

Gas side size
Connection type Flare connection
Liquid side size

(One way) 20*
Maximum height

difference

Height mm 320

Depth mm 228

High fan m3/h 900

Low fan m3/h 700

Height mm

Depth mm

Model

Output W

mm

mm

m

m8

42

0.3/8.80 0.3/9.00 0.3/8.80 0.3/9.00

42/39/37/35/33

∅12.7

∅6.35

1

15*

2

550

780
290

2350

2450

SHX33SC4-U

1500

2350

- 3 -

2450

FILE NO. SVM-08032

RAS-24SKPX

MODEL

ITEM Cooling Cooling

Capacity kW

Power source V 220 – 240

Power consumption W 2280 2360 2280 2360
Power factor % 98 88 98 88

Running current A

Indoor/Outdoor
Starting current A
Moisture removal lit/h

Noise

Refrigerant

Refrigerant control Capillary tube

Interconnection Connection type Flare connection
pipe Maximum length

INDOOR UNIT

Dimensions Width mm 1050

Net weight kg 13
Evaporator type Finned tube
Indoor fan type Cross flow fan

Air volume Medium fan m3/h

Fan motor output W
Air filter Honeycomb woven filter with PP frame

OUTDOOR UNIT

Dimensions Width mm 780

Net weight kg

Condenser type Finned tube
Outdoor fan type Propeller fan

Airflow volume m3/h

Fan motor output W 42

Compressor

Safety device IOL
Louver type Automatic louver
Usable outdoor temperature range °C 21 ~ 43

Indoor (H/M/L) dB 45/43/41/39/37
Outdoor (220 – 240 V) dB 56-57
Name of refrigerant R22
Rated amount kg

Gas side size
Connection type Flare connection
Liquid side size

(One way)
Maximum height

difference

Height mm 320

Depth mm 228

High fan m3/h 1100

Low fan m3/h

Height mm 715

Depth mm 290

Model

Output W

6.40 6.45 6.40 6.45

Phase 1∅

Hz 50

mm

mm

m

m10

220 V 240 V 220 V 240 V

0.3/10.3 0.3/10.9 0.3/10.3 0.3/10.9

2400

RAS-24S2AX

67

2.7

1.86

∅15.88

∅6.35

1

15*

2

25*

RAS-24SKPX

950

850

30

RAS-24S2AX

RAS-24S2A-E

52

2550

PH400X3CS-4KT1

1800

RAS-24SKP-E
RAS-24S2A-E

RAS-24SKP-E

2400 2550

– 4 –

Note : 1

• Capacity is based on the following temperature conditions.

FILE NO. SVM-08032-1

Condition

Temperature

Indoor unit inlet air temperature

Outdoor unit inlet air temperature

Note : 2

• Charge refrigerant according to the table below.

RAS-24SKPX / RAS-24S2AX

Refrigerant

*1 No need to charge

extra refrigerant

*2 Need to charge

extra refrigerant

RAS-24SKP-E / RAS-24S2A-E

Over 15 m up to 25 m (30 g/m) Over 15 m up to 20 m (20 g/m)

(DB) 27°C

(WB) 19°C

(DB) 35°C

(WB) 24°C

15 m or less 15 m or less

JIS C9612

Cooling

RAS-18SKPX / RAS-18S2AX

RAS-18SKPX-V / RAS-18S2AX-V

RAS-18SKP-E / RAS-18S2A-E

– 5 –

FILE NO. SVM-08032

2-1. Indoor Unit

Grille Inlet

Front Panel

73.57
50

Knock out system

320

2. CONSTRUCTION VIEWS

Heat exchanger

Air inlet

1050

Air outlet

Air filter

228

50

Knock out system

73.5
7

50

Drain hose (0.5m)

78 72

278 200 222 150

132

525

Hanger

Connecting pipe (0.39m)
(For 18 Series ; Flare

(For 24 Series ; Flare

85 23

Hanger

12.70)

15.88)

235

215

786

235

215

200

Hanger

Connecting pipe (0.49m)

6.35)(Flare

72 78

50

Wireless remote controller

For stud bold (
For stud bold (

157

56

63

19

125

26

Remote controller holder

6)
8~

10)

320

Outline of indoor unit

40

6

5

Hanger Hanger

262.5

Center line

262.5

Installation plate outline

40

6

5

10947 215.5 153.5

– 6 –

2-2. Outdoor Unit (18 Class)

A

32.5

600

50

36

320

306

A detail Drawing (Back leg)

R5.5

R

Ø

15

6 hole

86

320

Ø

FAN-GUARD

436

Ø

550

25 Drain outlet

108 125

2

-

Ø

11 x 14

(For 8 -

Ø

Ø

Hole

10 anchor bolt)

FILE NO. SVM-08032-1

306

320

Ø

6 hole

11x14 hole

Ø

B Detail Drawing (Front leg)

36
50

R

15

COVER-PV

Z

290

275

100 or more

Z View

600

Air intlel

9060090

69

129

84

320
342

Electrical part cover

Liquid side
(Flare 6.35)

Ø

Gas side
(Flare 12.7)

Ø

5

4

Service port

320

100 or more

Air outlel

600 or more

Installation dimension

– 7 –

600 or more

4x 11 Long holes(For 8- 10 anchor bolt)

Ø

Ø

Ø

2-3. Outdoor Unit (24 Class)

A

32.5

600

50
36

R

15

FILE NO. SVM-08032-1

125108

6 hole

320

306

Ø

R

5.5

A Detail Drawing (Back leg)

HANDLE

290

320

Ø

Ø

715

86

25 Drain outlet

FAN-GUARD

436

275

90 600 90 69

2Ø11x14 Hole
(For

Ø8-Ø

10 anchor bolt)

B

306

320

Hole

6

Ø

11x14 Hole

Ø

36
50

B Detail Drawing (Front leg)

320
342

R

15

HANDLE

COVER-PV

Z

100 or more

320

100 or more

Z View

600

Air inlet

Air out

let

00 or more

6

Installation dimension

600 or more

4x

54

129

84

11 Long holes(For

Ø

Service port

10 anchor bolt)

Ø8-Ø

Electrical part cover

Liquid side
(Flare Ø6.35)

Gas-side
(Flare Ø15.88)

– 8 –

FILE NO. SVM-08032

3. WIRING DIAGRAM

3.1. RAS-18SKPX / RAS-18S2AX, RAS-18SKPX-V / RAS-18S2AX-V,
RAS-18SKP-E / RAS-18S2A-E

COLOR IDENTIFICATION

BRW : BROWN
RED : RED
WHI : WHITE
YEL : YELLOW
BLU : BLUE
BLK : BLACK
GRY : GRAY
GRN&YEL : GREEN&YELLOW

Heat Exchanger
Sensor(TC)

Thermo Sensor(TA)

CN01

1

2

CN03

1

2

BLK

P04

R64

DB01

F01

6.3A

250VAC

RY02

SG01

DSA

R63

R62

1
2

1
2

C25

C26

L01

12V

MCU

C27

+

3

IC03

4

1

2

MCC-5044

WP-018

C07

CN07

3

4
5

CN11

1

3

CN10

3553

1

2112
3

4
5

1
22
3

1

1
2
3
4

5

1
2
3
4
5

Louver motor

AC Motor

FAN motor

OUTDOOR
TERMINAL

BLOCK

CONTACTOR

RED

WHI
PNK

POWER SUPPLY
220-240V~ 50Hz

BLK

MAGNETIC

CAPACITOR

S

R

COMPRESSOR

RED

INDOOR
TERMINAL
BLOCK

L

BLK

N

RED

2

1

1

RED

3

INDOOR
UNIT

OUTDOOR
UNIT

2

3

i

CHASSIS

GRN&YEL

BLK

BLK

SPARK KILLER

GRY

R

U

T

S

W

V

(or A)

A1

(or B)

A2

CAPACITOR

RED

C

BLK

WHI
RED

BLK

FAN MOTOR

– 9 –

3-2. RAS-24SKPX / RAS-24S2AX, RAS-24SKP-E / RAS-24S2A-E

FILE NO. SVM-08032

OUTDOOR
TERMINAL

BLOCK

POWER SUPPLY
220-240V~ 50 Hz

L

BLK

RED

1

1

N

BLK

RED

BLK BLK

SPARK KILLER

A2 A1

52C

RED

1/L1 2/T1

3/L2 4/T2

5/L3

6/T3

MAGNETIC CONTACTOR

2

2

RED

CAPACITOR

3

3

GRY

GRN&YEL

i

CHASSIS

RED

WHI
PNK

COMPRESSOR

CAPACITOR

S

R

OUTDOOR
UNIT

C

BLK

WHI
RED

F AN M OT OR

B LK

– 10 –

FILE NO. SVM-08032

4. SPECIFICATION OF ELECTRICAL PARTS

4-1. Indoor Unit (RAS-18SKPX, RAS-18SKPX-V, RAS-18SKP-E)

No. Parts name Type Specifications

1 Fan motor (for indoor) AFS-220-31-4A AC 200 − 240V, 31W
2 Thermo sensor (TA-sensor) ——— 10 kΩ at 25°C
3 Switching Transformer (T01) ST-001
4 Microcontroller TMP87CM40ANG-6P68
5 Heat exchanger sensor

(TC-sensor)
6 Line filter (L01) LC*SS11V-06270 27mH, 600mA
7 Diode (DB01) DB105G 1 A, 600 V
8 Capacitor (C27) EKMH401VSN470MP20S 47 µF, 400 V
9 Fuse (F01) FJL250V6.3A T6.3 A, 250 V

10 Varistor (R62, R63) SR561K14DL 560 V

11 Resistor (R64) RF-2TK5R6 5.6Ω , 2W
12 Louver motor MP24Z3T Output (Rated) 2 W, 6 poles, 1-2 phase,

——— 10 kΩ at 25°C

DC 12 V

4-2. Outdoor Unit (RAS-18S2AX, RAS-18S2AX-V, RAS-18S2A-E)

No. Parts name Type Specifications

Output (Rated) 1500 W, 2 poles, 1 phase, 220-240V~, 50 Hz

1 Compressor SHX33SC4-U Winding resistance (Ω) C-R C-S

(at 20°C) 1.47 2.88
Output (Rated) 42 W, 6 poles, 1 phase, 220 – 240 V~, 50 Hz

2 Fan motor (for outdoor) WLF-240-42A-1 Winding resistance (Ω) Red-Black White-Black

(at 20°C) 188 289

Running capacitor

3

(for fan motor)
Running capacitor

4

(for compressor)

5 Magnetic contactor CLK-26J 220-240V~, 50 Hz

DS451205NPQB

RS44B506U0218S AC440V~, 50µF

AC450V~, 2.0µF

– 11 –

FILE NO. SVM-08032

4-3. Indoor (RAS-24SKPX, RAS-24SKP-E)

No. Parts name Type Specifications

1 Fan motor (for indoor) ICF-340-30-2B AC 200 − 240V, 30W
2 Thermo sensor (TA-sensor) ——— 10 kΩ at 25°C
3 Switching Transformer (T01) SWT-77 DC7V, 12 V
4 Microcontroller TMP87CM40ANG-6P68
5 Heat exchanger sensor

(TC-sensor)
6 Line filter (L01) LC*SS11V-06270 27mH, 600mA
7 Diode (DB01) D3SBA60 4 A, 600 V
8 Capacitor (C03) EKMH451VSN121MQ35S 120 µF, 450 V
9 Fuse (F01) BET6.3A T6.3 A, 250 V

10 Varistor (R09, R10) SR561K14DL 560 V

11 Resistor (R01) RF-5TK1R8 1.8Ω , 5W
12 Louver motor MP24Z3T Output (Rated) 2 W, 6 poles, 1-2 phase,

13 G5NB-1A

Relay : (RY03)

——— 10 kΩ at 25°C

DC 12 V

Coil DC 12V, 16.7mA, Contact AC 250V, 1A

4-4. Outdoor Unit (RAS-24S2AX, RAS-S2A-E)

No. Parts name Type Specifications

Output (Rated) 2200 W, 2 poles, 1 phase

1 Compressor PH400X3CS-4KT1 Winding resistance (Ω ) C-R C-S

(at 20 °C)
Output (Rated) 42 W, 4 poles, 1 phase

2 Fan motor (for outdoor)

Running capacitor

3

(for fan motor)

Running capacitor

4

(for compressor)

5 Magnetic contactor

DS451305NPQB

RS44B506U0218S

FG-240-42A

A35

Winding resistance (Ω) Red-Black White-Black
(at 20 °C)

AC450V~ , 3.0µF

AC440V~, 50µF

220-240V~, 50 Hz

, 220 − 240V~, 50Hz

1.13
, 220 − 240V~, 50Hz

128 126

2.10

- 12 -

FILE NO. SVM-08032

5. REFRIGERATION CYCLE DIAGRAM

5-1. RAS-18SKPX / RAS-18S2AX, RAS-18SKPX-V / RAS-18S2AX-V

RAS-18SKP-E / RAS-18S2A-E

T

Heat exchanger

(Connecting pipe)

0.39 m
∅12.7

Cross flow fan

O.D.:12.7 mm O.D.:6.35 mm

Compressor

P

Packed valve

(∅12.7)

SHX33SC4-U

Discharge Muffler

∅

25x160L

Heat exchanger

Propeller fan
Outdoor unit

Packed valve

(∅6.35)

Capillary tube

∅2.0x1100 s

Refrigerant
R22 1.23 kg

Mark ( ) means check points of Gas Leak

0.49 m
(Connecting pipe)
∅6.35

Ambient temp.

50 Hz

Standard

pressure

(MPaG)

P

Surface temp. of heat

exchanger interchanging

pipe

T

(°C)

Fan speed

(indoor)

conditions DB/WB

(°C)

Indoor Outdoor

Standard 0.46 12.5 High 27/19 35/24

Cooling High temperature 0.51 17.5 High 32/23 43/26

Low temperature 0.32 6.5 Low 21/15 21/15

Note : Measure the heat exchanger temperature at the center of U-bend. (By means of TC sensor.)

– 13 –

5-2. RAS-24SKPX / RAS-24S2AX

RAS-24SKP-E / RAS-24S2A-E

FILE NO. SVM-08032

Indoor unit

Cooling

0.39 m
(Connecting pipe)

∅

15.88

O.D.:15.88 mm O.D.:6.35 mm

Cooling

Compressor

P

Packed valve

(∅15.88)

Gas container connection (Reinstall etc.)

PH400X3CS-4KT1

Discharge Muffler

∅

25x160L

Heat exchanger

Cross flow fan

Heat exchanger

T

0.49 m
(Connecting pipe)

∅

6.35

Packed valve

(∅6.35)

Capillary tube

800 s

∅2.0x

Refrigerant
R22 1.86 kg

Cooling

Propeller fan
Outdoor unit

Mark ( ) means check points of Gas Leak

Ambient temp.

50 Hz

Standard

pressure

(MPaG)

P

Surface temp. of heat

exchanger interchanging

pipe

T

(°C)

Fan speed

(indoor)

conditions DB/WB

(°C)

Indoor Outdoor

Standard 0.43 11.5 High 27/19 35/24

Cooling High temperature 0.56 14.4 High 32/23 43/26

Low temperature 0.33 4.0 Low 21/15 21/15

Note : Measure the heat exchanger temperature at the center of U-bend. (By means of TC sensor.)

– 14 –

Heat Exchanger Sensor

6. CONTROL BLOCK DIAGRAM

Indoor Unit Control Panel

M.C.U.

Functions

• Louver Control

FILE NO. SVM-08032

Operation

Display

Temperature Sensor

Infrared Rays Signal Receiver

Initiallizing Circuit

Infrared

Rays

Remote

Control

From Outdoor Unit

240 V AC 50 Hz

Clock Frequency

Oscillator Circuit

Power Supply

Circuit

Noise Filter

• 3-minute Delay at Restart for Compressor

• Motor Revolution Control

• Processing

(Temperature Processing)

• Timer

Outdoor unit

ON/OFF Signal

Relay Driver

Louver ON/OFF Signal

Louver Driver

Relay RY02 (for 18SKPX, 18SKPX-V and 18SKP-E)

or RY03 (for 24SKPX and 24SKP-E)

Outdoor Unit

Timer

Display

Filter Sign

Display

Fan Only

Sign Display

Hi Power

Sign Display

Indoor

Fan Motor

Louver Motor

REMOTE CONTROL

Infrared Rays

Remote Control

Operation ( )Operation ( )

Operation Mode Selection

AUTO, COOL, DRY, FAN ONLY

Temperature Setting
Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

Louver Auto Swing

Louver Direction Setting

ECO

Hi power

TIMER 1.3.5.9H

COMFORT SLEEP

QUIET

– 15 –

7. OPERATION DESCRIPTION

7-1. Remote control

7-1-1. Function of Push Putton

1

11

Infrared signal emitter

11

2

Start/Stop button

3

Mode select button (MODE)

4

Temperature button (TEMP)

5

Fan speed button (FAN)

6

Swing louver button (SWING)

7

Set louver button (FIX)

8

On timer button (ON)
Off timer button (OFF)

9

18

10

Sleep timer button (SLEEP)

19

Timer setup button (SET)

11
12

20

Timer clear button (CLR)

Memory and Preset button (PRESET)

13
14

One Touch button (ONE-TOUCH)

15

High power button (Hi-POWER)

16

Economy button (ECO)

17

Quiet button (QUIET)

18

Comfort sleep button (COMFORT SLEEP)

19

Filter reset button (FILTER)

20

Clock Reset button (CLOCK)

21

Check button (CHK)

FILE NO. SVM-08032

1

13

14

2

17

6

7
8

10

21

19

PRESET

ONE-TOUCH

QUIET

SWING

TIMER

SLEEP

CHK

FAN

TEMP

MODE

COMFORT

SLEEP

FIX Hi-POWER ECO

ON

OFF

FILTER

CLOCK

5

4

3

18

15

16

CLR

SET

12

9

11
20

- 16 -

7-1-2. Display of Remote Control

FILE NO. SVM-08032

All indications, except for the clock time indicator , are displayed by pressing the

5. TIMER and clock time indicator

1. Transmission mark

This transmission mark
remote controller transmits signals to the indoor
unit.

indicates when the

2. Mode indicator

Indicates the current operation mode.
A : Auto, : Cool, : Dry, : Fan only)

3. Temperature indicator

Indicates the temperature setting.
(17°C to 30°C)

4. FAN speed indicator

Indicates the selected fan speed.
AUTO or five fan speed levels

(LOW

HIGH

Indicate Auto will be appear with Dry operation
( : Dry) only.

, LOW+ , MED , MED+ ,

) can be shown.

9

12

1

2

13

10

The time setting for timer operation or the clock
time is indicated.

The current time is always indicated except
during TIMER operation.

6. Hi-POWER indicator

Indicates when the Hi-POWER operation starts.
Press the Hi-POWER button to start and press it

again to stop the operation.

7. (PRESET) indicator

Flashes for 3 seconds when the PRESET button is
pressed during operation.

The mark is shown when holding down the
button for more than 3 seconds while the mark is
blinks. Press another button to turn off the mark.

8. ECO indicator

Indicates when the ECO is in activated.
Press the ECO button to start and press it again

to stop operation.

9. A, B change indicator remote controller

When the remote controller switching function is
set, “B” appears in the remote controller displa y.
(When the remote controller setting is “A”, there is
no indication at this position.)

button.

11

10. Comfort sleep

Indicates when comfort sleep is activaled.
Press comfort sleep button to selector

11. Quiet

Indicates when quiet is activated.
Press quiet button to start and press it again to stop
operation.

12. One-Touch

Indicates when one touch comfort is activated.
Press one-touch button to start the operation.

13. Swing

Indicates when louver is swing.

8

6

3

7

4

5

Press swing button to start the swing operation
and press it again to stop the swing operation.

− 17 −

FILE NO. SVM-08032

7-2. Outline of Air Conditioner Control

This is a fixed capacity type air conditioner, which uses

a AC motor (18K) and DC motor (24K) for an indoor

fan. The AC motor (18K) and DC motor (24K) drive

circuit is mounted in the indoor unit. And electrical
parts which operate the compressor and the outdoor
fan motor, are mounted in the outdoor unit.
The air conditioner is mainly controlled by the indoor
unit controller. The controller operates the indoor fan
motor based upon commands transmitted by the
remote control and transfers the operation commands
to the outdoor unit.
The outdoor unit receives operation commands
from the indoor unit, and operates the outdoor
fan motor and the compressor.

(1) Role of indoor unit controller

The indoor unit controller receives the operation
commands from the remote control and executes
them.

• Temperature measurement at the air inlet of the
indoor heat exchanger by the indoor

temperature sensor

• Temperature measurement of the indoor heat
exchanger by the heat exchanger sensor

• Louver motor control

• Indoor fan motor operation control

• LED display control

• Transferring of operation commands to the

outdoor unit

• Receiving of information of the operation status
and judging of the information or indication of
error

(2) Role of outdoor unit controller

The outdoor unit controller receives the operation
commands from the indoor controller and
executes them.

• Compressor operation
control

• Operation control of

outdoor fan motor

Operations according
to the commands

from the indoor unit

• Turning off the compressor and outdoor fan
when the outdoor unit receives the shutdown
command

7-2-1. Louver control

(1) Vertical air flow louver

Position of veritcal air flow louver is automatically
controlled according to the operation mode.
Besides, position of vertical air flow louver can be
arbitrarily set by pressing [FIX] button.
The louver position which is set by [FIX] button is
stored in the microcomputer, and the louver is
automatically set at the stored position for the next
operation.

(2) Swing

If [SWING] button is pressed when the indoor unit
is in operation, the vertical air flow louver starts
swinging. When [SWING] button is pressed, it stops
swinging.

7-2-2. Indoor Fan Control

The operation controls the fan speed at indoor unit
side. The indoor fan (cross flow fan) is operated by
the phase control induction motor. The fan rotates in 5
stages in MANUAL mode, and in 5 stages in AUTO
mode, respectively. (Table 7-2-2)

1) When setting the fan speed to L, L+, M, M+ or H
on the remote controller, the operation is performed
with the constant speed show in Table 7-2-1

Table (7-2-1)

Indication

L
L+

M
M+

H

Fan speed

Low

(L + M) / 2

Med

(M + H) / 2

High

2) When setting the fan speed to AUTO on the remote
controller, revolution of the fan motor is controlled
to the fan speed level shown in Table 7-2-2 according
tp the setup temperature, room temperature, and heat
exchanger temperature.

Table 7-2-2 Indoor fan and air flow rate

OPERATION

MODE

RAS-18SKPX

Cooling
Fan only
Dry

rpm

RAS-18SKPX-V
RAS-18SKP-E

Model

RAS-24SKPX
RAS-24SKP-E

Air flow volume (m3/h)

rpm

Air flow volume (m3/h)

UH

1000

1200

1100

900

FAN TAP

M+

H M L L- UL SL
H M L L-

M+

M+

950
850

1125
1025

M L L- UL SL

900

800

1050

950

L+
L+
L+

850
750

1000

900

800
700

950
850

750
650

850
750

- 18 -

650
550

700
600

550
450

600
500

FILE NO. SVM-08032

7-3. Description of Operation Mode

(1) When turning on the breaker, the operation lamp

blinks. This means that the power is on (or the
power supply is cut off.)

(2) When pressing [ ] button on the remote control,

receiving beep sounds from the indoor unit,
and the next operation is performed together
with opening the vertical air flow louver.

(3) Once the operation mode is set, it is memorized in

the microcomputer so that the previous operation
can be effected the reafter simply by pressing
[ ] button.

7-3-1. Fan only operation

([MODE] button on the remote control is set
to the fan only operation.)

(1) When [FAN] button is set to AUTO, the indoor fan

motor operates as shown in Fig. 7-3-1. When
[FAN] button is set to LOW, LOW+, MED, MED+ or
HIGH, the motor operates with a constant air flow.

°C

7-3-2. Cooling operation

([MODE] button on the remote control is set
to the cooling operation.)

(1) The compressor,outdoor fan and operation display

lamp are controlled as shown in Fig. 7-3-2.

° C



ON ON

OFF OFF ON

Compressor

Outdoor fan

display lamp

OPERATION

(Room temp.) (Preset temp.)

Preset
temp.

0.5

0

Fig. 7-3-2

+3
+2.5
+2

+1.5
+1
+0.5

(Room temp.) − (Preset temp.)

Preset
temp.

0

(Preset temp.: 24 °C)

NOTE 1 : *1 : Fan speed = (M + − L) x 3/4 + L

*2 : Fan speed = (M + − L) x 2/4 + L
*3 : Fan speed = (M + − L) x 1/4 + L

(Linear approximation from M+ and L)

2 : The Hi Power, ECO and COMFORT SLEEP

operation can not be set

Fig. 7-3-1 Setting of air flow [FAN:AUTO]

M+

*1
*2
*3

(2) When [FAN] button is set to AUTO, the indoor fan

motor operates as shown in Fig. 7-3-3. When
[FAN] button is set to LOW, LOW+, MED, MED+ or
HIGH, the motor operates with a constant air flow.

°C

(Room temp.) − (Preset temp.)

Preset
temp.

+3
+2.5
+2
+1.5
+1
+0.5

0

-0.5

M+

*1
*2

*3

NOTE 1 : *1 : Fan speed = (M + − L) x 3/4 + L

*2 : Fan speed = (M + − L) x 2/4 + L
*3 : Fan speed = (M + − L) x 1/4 + L

(Linear approximation from M+ amd L)

- 19 -

Fig. 7-3-3 Setting of air flow [FAN:AUTO]

FILE NO. SVM-08032

7-3-3. Dry operation

([MODE] button on the remote control is set
to the dry operation.)

(1) The compressor, outdoor fan and operation display

lamp are controlled as shown in Fig. 7-3-4.

° C

ON:6min.

OFF:4min.

ON:6min.

OFF:4min.

ON:5min.

ON:5min.

OFF:5min.

OFF

OFF

Compressor

ON

OFF:5min.

Outdoor fan

display lamp

OPERATION

(Room temp.) (Preset temp.)

Preset
temp.

+3

+2

+1

0

Fig. 7-3-4

(2) The microprocessor turns the compressor on and

off at the regular intervals (4 to 6 minutes). While
the compressor is turning off, the indoor fan motor
operates in the SUPER LOW position.
The pattern of operation depending on the relation
between room temperature and preset
temperatures is shown in Fig. 7-3-5.

Room temp.

7-3-4. Automatic operation

([MODE] button on the remote control is set
to the automatic operation.)

(1) One of 2 operations (Cooling or Fan only)

is selected according to difference between the
preset temperature and the room temperature at
which the automatic operation has started, as
shown in Fig. 7-3-6. The Fan only operation
continues until the room temperature reaches a
level at which another mode is selected.

(2) Temporary Auto

When the [RESET] button on the indoor unit
is pushed, the preset temperature is fixed at 24°C
and the indoor unit is controlled as shown in
Fig. 7-3-6.

°C

Cooling operation

0

-1

(Room temp.) − (Preset temp.)

Fan only operation

Preset temp.+1

Preset temp.

Compressor

Outdoor fan

Indoor fan

ON ON ON ON

OFF OFF OFF

L. *S.L. S.L.L. L. S.L. L.

*Super Low

Fig. 7-3-5

(3) [FAN] button on the remote control is set to AUTO

only.

(4) The ECO, COMFORT SLEEP, QUIET and

Hi Power operations can not be set.

Fig. 7-3-6

- 20 -

FILE NO. SVM-08032

7-4.

Description of Safety and Reliability Prevention Function

7-4-1 Low-Temperature Limit Control

The microcontroller detects the indoor heat exchanger temperature to prevent the indoor heat exchanger

from freezing.The compressor and outdoor fan motor are controlled as shown in Fig. 7-4-1.

Heat exchanger
temperature

(°C)

6

2

Fig. 7-4-1

Compressor Outdoor fan

ON

Less than 2°C continues

for 5 minutes

OFF

7-5. One-Touch Operation

One touch comfort is the fully automated operation that is set according to the preferable condition in a region.

Fan
Operation

Hi-POWER

0

12

Fig. 7-5-1

*AUTO/L : Fan operates depends on the setting temperature and room temperature.
During the One Touch Comfort mode if the indoor unit receives any signal with other operation mode, the unit

will cancel the comfort mode and operates according to the signal received.

Operation description.

*AUTO/L

25

Time after operation
starts (min)

When an indoor unit receives "One Touch Comfort Signal" from the remote controller, the indoor unit operates
as following.

1) Air conditioner starts to operation when the signal is received, even if the air conditioner was OFF.

2) Operation mode is set Cooling mode.

3) Target temperature is 22ºC.

4) Louver position is set swing.

5) Fan is controlled as diagram.

– 21 –

FILE NO. SVM-08032

7-6. Hi POWER Operation

([Hi POWER] button on the remote

control is pressed.)

When [Hi POWER] button is pressed while the indoor
unit is in Auto or Cooling operation, Hi POWER mark
is indicated on the display of the remote control and
the unit operates as follows.

(1) Automatic operation

The indoor unit operates in according to the

·

current operation.

(2) Cooling operation

• The setting temperature drops 3°C.
(The value of the setting temperature on the
remote control does not change.)

• If the room temperature is higher than the
setting temperature by 3.5°C or more, the
horizontal louver moves to the Hi POWER
position automatically. Then when the room
temperature is 1°C less than the setting
temperature the horizontal louver returns
automatically.

• FAN speed : [AUTO]
If the room temperature is higher than the
setting temperature by 3.5°C or more, the air
conditioner operates at maximum airflow level.
If the room temperature is higher than the
setting temperature by less than 3.5°C, the air
conditioner operates at normal airflow level.

• FAN speed : One of 5 levels
If the room temperature is higher than the
setting temperature by 3.5°C or more, the air
conditioner operates at higher consecutive
airflow level. If the room temperature is higher
than the setting temperature by less than 3.5°C,
the air conditioner operates at normal airflow
level.

The indoor unit's fan speed level increase 1 tap

·

7-7. QUIET Operation

When the [QUIET] button is pressed, the fan of the
indoor unit will be restricted the revolving speed at
speed L− until the [QUIET] button is pressed once
again (cancel Quiet mode).

Quiet mode is the system which, control the revolving

speed of indoor fan to work constantly at lower than

speed L. In addition, noise level of indoor unit is less

than usual.

Remarks :

1. Quiet mode is unable to work in dry mode.

2. Quiet mode is appropriate to work with less cooling
load condition. Because of the fan speed L− may
cause not enough the cooling capacity.



7-8. ECO Operation

Cooling operation

·

The preset temperature will increase 1ºC after the
ECO mode has operated for 1 hour and the temperature
will increase another 1ºC after the ECO mode has
operated for 2 hour. (the value of the preset temperature
on the remote control does not change.)

·

The indoor fan speed is depend on presetting and can
change every speed after setting ECO operation.

(3) The Hi POWER mode can not be set in Dry or Fan

only operation.

(4) The Hi POWER mode can memorize with timer

function.

– 22 –

FILE NO. SVM-08032

7-9. COMFORT SLEEP Operation

Cooling operation

·

The preset temperature will increase 1ºC after the

comfort sleep mode has operated for 1 hour and

the temperature will increase another 1ºC after
the comfort sleep mode has operated for 2 hour.

(the value of the preset temperature on the

remote control does not change)

·

Press the [COMFORT SLEEP] button to select
this function. The comfort sleep function will be
activate together with Auto shut down function.

Period of operation time can be selected by

re-press the [COMFORT SLEEP] button.

The period of operation time are follows.

1H 3H 5H 9H

Cancel

The principles of comfort sleep mode are:

·

Quietness for more comfortable. When room
temperature reach setting temperature.

·

Save energy by changing room temperature
automatically.

·

The air condition can shut down by itself auto­matically.(follow to operation time that selected)

7-10. FILTER Check lamp

When the elapsed time reaches 1000 hours, the FILTER
indicator lights. After cleaning the filters, turn off the
FILTER indicator.

How to Turn Off FILTER Indicator

Press [RESET] button on the indoor unit or press filter
button on the remote control.

NOTE :

If [RESET] button is pushed while the FILTER indicator

is not lit, the indoor unit will start the automatic operation.

When you want a temporary operation while the FILTER

lamp lights, press [RESET] button to turn off the FILTER
lamp.

Remarks :

Comfort sleep mode will not operate in dry mode
and fan only mode.

– 23 –

FILE NO. SVM-08032

7-11. Auto Restart Function

This indoor unit is equipped with an automatic restarting function which allows the unit to restart operating with
the set operating conditions in the ev ent of a power supply being accidentally shut down.
The operation will resume without warning three minutes after power is restored.

This function is not set to work when shipped from the factory. Therefore it is necessary to set it to work.

7-11-1. How to Set the Auto Restart Function

To set the auto restart function, proceed as follows:
The power supply to the unit must be on ; the function will not set if the power is off.
Press the [RESET] button located in the center of the front panel continuously f or three seconds.
The unit receives the signal and beeps three times.
The unit then restarts operating automatically in the event of power supply being accidentally shut down.

• When the unit is standby (Not operating)

Operation

Press [RESET] button for more than
three seconds. (Less than 10 seconds)

Hi POWER FILTER PAP TIMER OPERATION

RESET

• When the unit is in operation

Operation

Press [RESET] button for more than
three seconds. (Less than 10 seconds)

Motions

The unit is on standby.

↓

The unit starts to operate. The green indicator is on.

↓ After approx. three seconds,

The unit beeps three times The green indicator blinks
and continues to operate. for 5 seconds.

If the unit is not required to operate at this time, press [RESET]
button once more or use the remote controller to turn it off.

Motions

The unit is in operation. The green indicator is on.

↓

The unit stops operating. The green indicator is turned off.

Hi POWER FILTER PAP TIMER OPERATION

RESET

↓ After approx. three seconds,

The unit beeps three times. The green indicator blinks

for 5 seconds.

If the unit is required to operate at this time, press [RESET] button
once more or use the remote controller to turn it on.

– 24 –

FILE NO. SVM-08032

7-11-2. How to Cancel the Auto Restart Function

To cancel auto restart function, proceed as follows :
Repeat the setting procedure : the unit receives the signal and beeps three times.
The unit will be required to be turned on with the remote controller after the main power supply is turned off.

• When the system is on stand-by (not operating)

Operation

Press [RESET] button for more than
three seconds. (Less than 10 seconds)

Hi POWER FILTER PAP TIMER OPERATION

RESET

• When the system is operating

Operation

Press [RESET] button for more than
three seconds. (Less than 10 seconds)

Motions

The unit is on standby.

↓

The unit starts to operate. The green indicator is on.

↓ After approx. three seconds,
The unit beeps three times and continues to operate.
If the unit is not required to operate at this time, press [RESET]

button once more or use the remote controller to turn it off.

Motions

The unit is in operation. The green indicator is on.

↓

The unit stops operating. The green indicator is turned off.

↓ After approx. three seconds,
The unit beeps three times.

Hi POWER FILTER PAP TIMER OPERATION

RESET

If the unit is required to operate at this time, press [RESET] button
once more or use the remote controller to turn it on.

7-11-3. Power Failure During Timer Operation

When the unit is turned off because of power failure
during timer operation, the timer operation is cancelled.
In that case, set the timer operation again.

NOTE :

The Everyday Timer is reset while a command signal
can be received from the remote controller even if it
stopped due to a power failure .

– 25 –

FILE NO. SVM-08032

7-12. Self-Cleaning Operation

Unit now performing cooling or dry operation

Press “STOP” button

Only timer indicator lights, and Self Cleaning operation starts

Time set now elapses

Operation stops

• During Self-Cleaning operations: The louver opens
slightly. The indoor fan operates continuously at
a speed of SL rpm.

1. Purpose

The Self-Cleaning operation is to minimize the growth of mold,
bacteria etc. by running the fan and drying so as to keep
the inside of the air conditioner clean.

Self-Cleaning operation

When the cooling or dry operation shuts down, the unit
automatically starts the Self-Cleaning operation which is
then performed for the specified period based on duration

of the operation which was performed prior to the shutdown,

after which the Self-Cleaning operation stops.

2. Operation

1) When the stop signal from the remote controller or
timer-off function is received, only the timer indicator
light.

2) The period of the Self-Cleaning operation is determined
by the duration of the operation performed prior to
the reception of the stop code.

3) After the Self-Cleaning operation has been performed
for the specified period, the unit stops operation.

Self-Cleaning operation times

Operation time

Up to 10 minutes

Cooling: Auto (cooling) Dry

Auto (fan only)

Shutdown

• To stop an ongoing Self-Cleaning operation at any time
Press the start/stop button on the remote controller twice during the Self-Cleaning
operation. [After pressing the button for the first time, press it for the

second time without delay (within 10 minutes)].

10 minutes
or longer

No Self-Cleaning operation performed

Self-Cleaning operation time

No Self-Cleaning operation

performed (0 minutes)

20 mins.

– 26 –

FILE NO. SVM-08032

7-12-1 Self-Cleaning diagram

Operation display ON OFF OFF

FCU fan

FCU louver OPEN OPEN (12.7º) CLOSE

Timer display

Compressor

CDU fan ON or OFF

rpm is depend on presetting. (SL)

depend on presetting of timer function. depend on presetting of timer function.

depend on presetting per room temperature.

depend on presetting per room temperature.

Cool mode or dry mode

operation more than 10 mins.

7-12-2 Self-Cleaning function release

How to cencel Self-Cleaning function

To cancel the Self-Cleaning function, proceed as
follows:

• Press [RESET] button one time or use remote

control to turn on air conditioner. Display will show

in green color.

• Hold down the [RESET] button for more than
20 seconds. (The air conditioner will stop suddenly
when the [RESET] is pressed but keep holding it

continue. The will beep 3 times in the first

3 seconds but it is not related to Self-Cleaning

function)

• After holding about 20 seconds, the air conditioner

will beep 5 times without any blinking of display.

• The Self-Cleaning Operation had been cancelled.

Remark

Presetting of Self-Cleaning function above, AUTO-

ON ON

ON or OFF

ON or OFF

Turn off by remote controller or

timer-off function.

ON

OFF OFF

OFF OFF

Self-Cleaning mode

operate 20 mins.

Automatically turn-off.

How to set Self-Cleaning function

To set the Self-Cleaning function, proceed as follows.

• Press [RESET] button one time or use remote

control to turn on air conditioner. Display will show
in green color.

• Hold down the [RESET] button for more than

20 seconds. (The air conditioner will stop suddenly
when the [RESET] is pressed but keep holding it
continue. Then will beep 3 times is the first 3
seconds but it is not related to Self-Cleaning

function)

• After holding about 20 seconds, the air conditioner

will beep 5 times and OPERATION display blinks

5 times.

• The Self-Cleaning function had been set.

Remark

Presetting of Self-Cleaning function above, AUTO­RESTART function had been cancelled. To set

AUTO-RESTART again.

RESTART function had been cancelled. To set
AUTO-RESTART again.

OFF

ON or OFF

Operation time

-

27

Hi POWER FILTER PAP TIMER OPERATION

RESET

-

FILE NO. SVM-08032

8. INSTALLATION PROCEDURE

8-1.Safety Cautions

For general public use

Power supply cord of Outdoor unit shall be more than 4 mm2 (H07RN-F or 245 IEC66 : polychloroprene
sheathed flexible cord) or 3.5 mm2 (AWG-12).

CAUTION

This appliance must be connected to the main power supply by means of a circuit breaker or a switch with a
contact separation of at least 3 mm.
If this is not possible, a power supply plug with earth must be used. This plug must be easily accessible after
installation. The plug must be disconnected from the power supply socket in order to disconnect the
appliance completely from the mains.

To Disconnect the Appliance from the Main Power Supply.

DANGER

• FOR USE BY QUALIFIED PERSONS ONLY.

• TURN OFF MAIN POWER SUPPLY BEFORE ATTEMPTING ANY ELECTRICAL WORK. MAKE SURE

ALL POWER SWITCHES ARE OFF. FAILURE TO DO SO MAY CAUSE ELECTRIC SHOCK.

• CONNECT THE CONNECTING CABLE CORRECTLY. IF THE CONNECTING CABLE IS CONNECTED
WRONGLY, ELECTRIC PARTS MAY BE DAMAGED.

• CHECK THE EARTH WIRE THAT IT IS NOT BROKEN OR DISCONNECTED BEFORE INSTALLATION.

• DO NOT INSTALL NEAR CONCENTRATIONS OF COMBUSTIBLE GAS OR GAS VAPORS.

FAILURE TO FOLLOW THIS INSTRUCTION CAN RESULT IN FIRE OR EXPLOSION.

• TO PREVENT OVERHEATING THE INDOOR UNIT AND CAUSING A FIRE HAZARD, PLACE THE UNIT
WELL AWAY (MORE THAN 2 M) FROM HEAT SOURCES SUCH AS RADIATORS, HEATORS,
FURNACE, STOVES, ETC.

• WHEN MOVING THE AIR-CONDITIONER FOR INSTALLING IT IN ANOTHER PLACE AGAIN, BE VERY
CAREFUL NOT TO GET THE SPECIFIED REFRIGERANT (R22) WITH ANY OTHER GASEOUS
BODY INTO THE REFRIGERATION CYCLE. IF AIR OR ANY OTHER GAS IS MIXED IN THE
REFRIGERANT, THE GAS PRESSURE IN THE REFRIGERATION CYCLE BECOMES ABNORMALLY
HIGH AND IT RESULTINGLY CAUSES BURST OF THE PIPE AND INJURIES ON PERSONS.

• IN THE EVENT THAT THE REFRIGERANT GAS LEAKS OUT OF THE PIPE DURING THE
INSTALLATION WORK, IMMEDIATELY LET FRESH AIR INTO THE ROOM. IF THE REFRIGERANT GAS
IS HEATED BY FIRE OR SOMETHING ELSE, IT CAUSES GENERATION OF POISONOUS GAS.

WARNING

• Never modify this unit by removing any of the safety guards or bypassing any of the safety interlock
switches.

• Do not install in a place which cannot bear the weight of the unit.
Personal injury and property damage can result if the unit falls.

• Before doing the electrical work, attach an approved plug to the power supply cord.
Also, make sure the equipment is properly earthed.

• Appliance shall be installed in accordance with national wiring regulations.
If you detect any damage, do not install the unit. Contact your TOSHIBA dealer immediately.

CAUTION

• Exposure of unit to water or other moisture before installation could result in electric shock.
Do not store it in a wet basement or expose to rain or water.

• After unpacking the unit, examine it carefully for possible damage.

• Do not install in a place that can increase the vibration of the unit. Do not install in a place that can amplify

the noise level of the unit or where noise and discharged air might disturb neighbors.

• To avoid personal injury, be careful when handling parts with sharp edges.

• Please read this installation manual carefully before installing the unit. It contains further important instruc-

tions for proper installation.

– 28 –

FILE NO. SVM-06060

REQUIREMENT OF REPORT TO THE LOCAL POWER SUPPLIER

Please make absolutely sure that the installation of this appliance is reported to the local power supplier
before installation. If you experience any problems, or if the installation is not accepted by the supplier, the
service agency will take adequate countermeasures.

– 29 –

8-2. Installation Diagram of Indoor and Outdoor Units

FILE NO. SVM-08032

Super Oxi Deo filter

3 Batteries

2 Wireless remote control

5

(

A

t

t

a

c

h

t

o

t

h

e

f

r

6

Super Sterilizer filter

170 mm or more

o

n

t

p

a

n

e

l

.

8 Pan head

Air fi lter

)

wood screw

50 mm or more

Hook

Remote control holder

4

Vinyl tape
Apply after carrying
out a drainage test.

Hook

1 Installation

plate

170 mm or more

Shield pipe

Saddle

For the rear left and left piping

Wall

Insert the cushion between the
indoor unit and wall, and tilt the

indoor unit for better operation.

Do not allow the drain hose
to get slack.

Cut the piping
hole sloped
slightly.

Make sure to run the drain
hose sloped downward.

The auxiliary piping can be
connected to the left, rear left,

rear right, right, bottom right
or bottom left.

Right

Rear right

Bottom right

Rear
left

Left

Bottom left

100 mm or more

600 mm or more

Extension
drain hose
(Not available,

100 mm or more

600 mm or more

provided by installer)

100 mm or more

600 mm or more

600 mm or more

18 Class 24 Class

Before installing the wireless remote controller

• Loading Batteries

1. Remove the battery cover.

2. Insert 2 new batteries (AAA type)
following the (+) and (

-

) positions.

100 mm or more

600 mm or more

Extension
drain hose
(Not available,
provided by installer)

600 mm or more

A

C

L

2 Wireless remote controller

Insulate the refrigerant pipes
separately with insulation, not
together.

8 mm thick heat resisting
polyethylene foam

3 Batteries

– 30 –

8-3.Installation

8-3-1. Optional installation parts

FILE NO. SVM-08032

Part

Code

Refrigerant piping
Liquid side : ∅6.35 mm

A

Gas side : ∅12.70 mm (18 series

: ∅15.88 mm (24 series

Pipe insulating material

B

(polyethylene foam, 8 mm thick)
Putty, PVC tapes

C

<Fixing bolt arrangement of outdoor unit>

125 mm108 mm

320 mm

7 mm

32.5 mm

86 mm

Air outlet

Æ

600 mm

30

Air inlet

102 mm

90 mm

Drain outlet

Parts name

)
)

Q'ty

One

each

1

One

each

Fig. 8-3-1

·

Secure the outdoor unit with fixing bolts and nuts if the unit is likely to be exposed to a strong wind.
Use ∅ 8 mm or ∅ 10 mm anchor bolts and nuts.

·

– 31 –

8-3-2. Accessory and installation parts

FILE NO. SVM-08032

Part

No.

Part name (Q'ty)

1

Installation plate x 1

2

Wireless remote control x 1

3

Battery x 2

Others

Owner’s manual

Installation manual

Name

Part

No.

Part name (Q'ty)

4

Remote control holder x 1

5

Super Oxi Deo filter x 2

6

Super Sterilizer filter x 2

Part

No.

Part name (Q'ty)

7

Mounting screw ∅ 4 x 25 x 6

8

Pan head wood screw

∅ 3.1 x 16 x 2

l

9

Screw ∅ 4 x 10 x 2

l

l

– 32 –

FILE NO. SVM-08032

8-4. Indoor Unit

8-4-1. Installation Place

• A place which provides enough spaces around the

indoor unit as shown in the diagram.

• A place where there are no obstacle near the air

inlet and outlet.

• A place which allows easy installation of the piping

to the outdoor unit.

• A place which allows the front panel to be opened.

• The indoor unit shall be installed so that the top of

the indoor unit is positioned at least 2m in height.

• Also, avoid putting anything on the top of the

indoor unit.

CAUTION

• Direct sunlight on the indoor unit wireless

receiver should be avoided.

• The microprocessor in the indoor unit should

not be too close to r-f sources.
(For details, see the owner's manual.)

<Remote control>

• Should be placed where there are no obstacles,

such as curtains, that may block the signal.

• Do not install the remote controller in a place

exposed to direct sunlight or close to a heating
source, such as a stove.

• Keep the remote controller at least 1 m away from

the nearest TV set or stereo equipment.
(This is necessary to prevent image disturbances or
noise interference.)

• The location of the remote controller should be

determined as shown below.

(Side view)

Indoor unit

(Top view)

Indoor unit

8-4-2. Drilling a Hole and Mounting Instal-

lation Plate

<Drilling a hole>

When install the refrigerant pipes from the rear.

e center of pipe hole

m from the right side edge is

23mm

35 120 180 240

Pipe hole

dia.65mm

The center of the pipe hole is above
the arrow.

Fig. 8-4-2

1. After determining the pipe hole position on the
installation plate (

) drill the pipe hole (Ø65

ð

mm) at a slight downward slant to the outdoor
side.

NOTE :

• When drilling into a wall that contains a metal lath,

wire lath or metal plate, be sure to use a pipe hole
brim ring sold separately.

<Mounting the installation plate>

Anchor bolt holes

5

3

2

1

0

8

1

0

0

4

2

50

u

o

T

Hook

e

n

i

l

t

u

o

t

i

n

u

o

T

0

7

1

m

m

0

4

2

the center of pipe hole

5

8

Offset 85mm from the left side edge is

e

n

i

l

t

u

o

t

ni

u

o

T

m

5m

3

e

n

i

l

t

u

o

t

ni

u

o

T

m

m

20

1

3

2

0

40

Offset 23mm from the right side edge is

0

7

1

e

n

i

l

t

u

o

t

i

n

m

m

0

4

2

the center of pipe hole

2

3

1

3

2

m

m

5

6

.
a

i

d

2 m or more from floor

Reception
range

Remote
controller

Fig. 8-4-1

Reception
range

Remote controller

– 33 –

Pipe hole

Indoor unit

Hook

Thread

7

Weight

Fig. 8-4-3

Hook
Mounting
Screw

Pipe hole (dia. 65mm)

Installation

1

plate

FILE NO. SVM-08032

<When the installation plate is directly
mounted on the wall>

1. Securely fit the installation plate onto the wall by
screws with the upper and lower catches, that
hold the indoor unit, facing out.

2. To mount the installation plate on a concrete wall
use anchor bolts. Drill the anchor bolt holes as
illustrated in the above figure.

3. Install the installation plate horizontally and level.

CAUTION

When installing the installation plate with mount­ing screw, do not use the anchor bolt hole.
Otherwise the unit may fall down and result in
personal injury and property damage.

Installation plate
<Keep horizontal direction>

Anchor bolt

Projection
15mm or less

8-4-3. Electrical Work

1. The supply voltage must be the same as the
rated voltage of the air conditioner.

2. Prepare a power source for the exclusive use of
the air conditioner.

NOTE :

• Wire type :

More than 1.5 mm2 H07RN-F or 60245IEC66.

CAUTION

• This appliance can be connected to a main

circuit breaker in either of the following two
ways.

1. Connection to fixed wiring:
A switch or circuit breaker which discon-

nects all poles and has a contact separa­tion of at least 3 mm must be incorporated
in the fixed wiring. An approved circuit
breaker or switch must be used.

2. Connection with power supply plug:
Attach power supply plug with power cord

and plug it into wall outlet. An approved
power supply cord and plug must be used.

Fig. 8-4-4

5 mm dia. hole

7 Mounting screw
Ø4 × 25

Clip anchor
(local parts)

Fig. 8-4-5

l

CAUTION

Failure to securely install the unit may result in
personal injury and/or property damage if the
unit falls.

• In case of block, brick, concrete or similar type

walls, drill 5 mm dia. holes in the wall.

• Insert clip anchors for the

NOTE :

• Install the installation plate using mounting screws

between 4 to 6, being sure to secure all four
corners.

mounting screws.



NOTE :

• Perform wiring work being sure the wire length is

long enough.

8-4-4. Wiring Connection

<How to connect the connecting cable>

Wiring the connecting cable can be carried
out without removing the front panel.

1. Remove the air inlet grille. Open the air inlet grille
upward and pull it toward you.

2. Remove the terminal cover and cord clamp.

3. Insert the connecting cable (or as according to
local regulations/codes) into the pipe hole on the
wall.

4. Pull the connecting cable through the cable slot
on the rear panel so that it protrudes about
15 cm out of the front.

5. Insert the connecting cable fully into the terminal
block and secure it tightly with screws.

6. Tightening torque: 1.2 N•m (0.12 kgf•m)

7. Secure the connecting cable with the cord clamp.

8. Attach the terminal cover, rear plate bushing and
air inlet grille on the indoor unit.

– 34 –

FILE NO. SVM-08032-1

CAUTION

CAUTION

• Be sure to refer to the wiring system diagram

labeled inside the front panel.

• Check local electrical regulations for any

specific wiring instructions or limitations.

Cord clamp

Terminal cover

Screw

Connecting cable

Screw

ab

out

1

20 mm

5 c

m

Fig. 8-4-6

110

mm

Terminal block

1

2

3

Earth line

Connecting cable

Ear

th l

ine

8-4-5. Piping and Drain Hose Installation

<Piping and drain hose forming>

• Since condensation results in machine trouble,

make sure to insulate both the connecting pipes
separately.
(Use polyethylene foam as insulating material.)

Rear right

Rear left

Bottom left

Changing

Left

drain hose

Bottom right

Die-cutting

Right

Front panel slit

Fig. 8-4-8

1. Die-cutting front panel slit

Cut out the slit on the left or right side of the front
panel for the left or right connection and the slit
on the bottom left or side of thefront panel for the
bottom left or right connection with a pair of
nippers.

2. Changing drain hose

For left connection, left-bottom connection and
rear-left connection’s piping, it is necessary to
relocate the drain hose and drain cap.

Piping preparation

10 mm

80 m

m

Stripping length of the connecting cable

Fig. 8-4-7

NOTE :

• Use stranded wire only.

• Wire type : H07RN-F or more

<How to remove the drain cap>

Clip drain cap with needle-nose pliers, and pull out.

Fig. 8-4-9

<How to remove the drain hose>

The drain hose is secured in place by a screw.
Remove the screw securing the drain hose, then pull

out the drain hose.

Heat insulator

Drain hose

– 35 –

Fig. 8-4-10

FILE NO. SVM-08032

<How to attach the drain cap>

1. Insert hexagonal wrench (4 mm).

4 mm

Fig. 8-4-11

2. Firmly insert drain cap.

No gap

Do not apply lubricating oil
(refrigerant machine oil)
when inserting the drain cap.
If applied, deterioration and

Insert a hexagon
wrench (Ø4mm)

drain leakage of the drain
plug may occur.

<In case of bottom right or bottom left piping>

• After making slits on the front panel with a knife or

similar tool, cut them out with a pair of nippers or
an equivalent tool.

Slit

Fig. 8-4-14

<Left-hand connection with piping>

Bend the connecting pipes so that they are posi­tioned within 43 mm above the wall surface.

If the connecting pipes are positioned more than
43 mm above the wall surface, the indoor unit may
be unstable.

When bending the connecting pipe, make sure to
use a spring bender to avoid crushing the pipe.

Refer to the table below for the bending
radius of each connection pipe.

Fig. 8-4-12

<How to attach the drain hose>

Always use the original scre w that secured the
drain hose to the unit. If using a different screw
may cause water to leak.

Insert the drain hose firmly until the connector
contacts with the insulation, then secure it in place
using the original screw.

CAUTION

Securely insert the drain hose and drain cap;

otherwise, water may leak.

<In case of right or left piping>

• After making slits on the front panel with a knife or

similar tool, cut them out with a pair of nippers or
an equivalent tool.

Outer diameter

6.35 mm

12.7 mm, 15.88 mm

Bending radius

30 mm

5

0 mm

To connect the pipe after installation of the
unit (figure)

(To the front flare)

520 mm

420 mm

Liquid side

R30 or less (Ø6.35), R50 or less (Ø12. 7, Ø15. 88)
Use polishing (polyethylene core or the like for bending pipe).

43 mm

Gas side

Outward form of indoor unit

Use a screwdriver handle, etc.

Fig. 8-4-15

Slit

Fig. 8-4-13

NOTE :

If the pipe is incorrectly bent, the indoor unit may be
unstable on the wall.

After passing the connecting pipe through the pipe
hole, connect the connecting pipe to the auxiliary
pipes and wrap the facing tape around them.

– 36 –

FILE NO. SVM-08032-1

50 mm
or more

Do not rise the drain hose.

Do not form the drain hose
into the waved shape.

Do not put the
drain hose end
into water.

Do not put the drain
hose end in the
drainage ditch.

CAUTION

• Bind the auxiliary pipes (two) and connecting

cable with facing tape tightly.
In case of leftward piping and rear-leftward

piping, bind the auxiliary pipes (two) only with
facing tape.

Indoor unit

Auxiliary pipes

Installation
plate

Fig. 8-4-16

• Carefully arrange the pipes so that none of the

pipes stick out of the rear plate of the indoor unit.

• Carefully connect the auxiliary pipes and

connecting pipes to each other and cut off the
insulating tape wound on the connecting pipe
to avoid double-taping at the joint, moreover,
seal the joint with the vinyl tape, etc.

• Since condensation can result in machine

performance trouble, be sure to insulate both
connecting pipes. (Use polyethylene foam as
insulating material.)

• When bending a pipe, be careful not to crush it.

Connecting
cable

Information

The lower part of indoor unit may float, due to the

condition of piping and you cannot fix it to the

installation plate. In that case, use the 9 screws

trovided to fix the unit and the installation plate.

Screw

9

Fig. 8-4-19

8-4-7. Drainage

1. Run the drain hose at a downward sloped angle.

NOTE :

• Hole should be made at a slight downward slant

on the outdoor side.

9

Screw

8-4-6. Indoor Unit Installation

1. Pass the pipe through the hole in the wall, and
hook the indoor unit on the installation plate at
the upper hooks.

2. Swing the indoor unit to right and left to confirm
that it is firmly hooked on the installation plate.

3. While pressing the indoor unit onto the wall, hook
it at the lower part on the installation plate.
Pull the indoor unit toward you to confirm that it is
firmly hooked on the installation plate.

1

2

Hook

• For detaching the indoor unit from the installation

plate pull the indoor unit toward you while pushing
the bottom up at the specified places.

Hook here

1

Installation
plate

Fig. 8-4-17

Push (unhook)

Fig. 8-4-20

2. Put water in the drain pan and make sure that the
water is being drained outside.

3. When connecting extension drain hose, insulate
the connection part of extension drain hose with

shield pipe.

Shield pipe

Drain hose

Inside the room

Extension drain hose

Fig. 8-4-21

CAUTION

Install the drain pipe for proper drainage.
Improper drainage can result in water dripping

inside the room.

This air conditioner has been designed to drain
water collected from condensation which forms on
the back of the indoor unit, to the drain pan.

Therefore, do not locate the power cord and other
parts at a high place than the drain guide.

PushPush

Fig. 8-4-18

– 37–

Space for
pipes

Wall

Drain
guide

FILE NO. SVM-08032

8-5.Outdoor Unit

8-5-1. Installation place

• A place which provides the spaces around the
outdoor unit as shown in the left diagram.

• A place which can bear the weight of the outdoor
unit and does not allow an increase in noise level
and vibration.

• A place where the operation noise and discharged
air do not disturb your neighbors.

• A place which is not exposed to a strong wind.

• A place free of a leakage of combustible gases.

• A place which does not block a passage.

• When the outdoor unit is to be installed in an

elevated position, be sure to secure its feet.

• An allowable length of the connecting pipe is up
15 m. (Refer to the table of TO CHARGE
REFRIGERANT for detail.)

• An allowable height level is up to 8 m. (RAS-18 class)
or 10 m. (RAS-24 class)

• A place where the drain water does not raise any
problem.

CAUTION

1. Install the outdoor unit without anything b locking
the air discharging.

2. When the outdoor unit is installed in a place
exposed always to a strong wind like a coast or
on a high story of a building, secure
the normal fan operation using a duct or a wind
shield.

3. Specially in windy area, install the unit to prevent
the admission of wind.

4. Installation in the following places may result in
trouble.
Do not install the unit in such places.

• A place full of machine oil.

• A saline-place such as the coast.

• A place full of sulfide gas.

• A place where high-frequency waves are likely

to be generated as from audio equipment,
welders, and medical equipment.

8-5-2. Refrigerant piping connection

1. Cut the pipe with a pipe cutter.

90°

Obliquity

Roughness

Fig. 8-5-2

2. Insert a flare nut into the pipe, and flare the pipe.

• Projection margin in flaring : A (Unit : mm)

A

Die

Pipe

Fig. 8-5-3

Outer dia.

of copper pipe

Rigid Imperial

A

6.35 1.0 to 1.5 1.5 to 2.0

12.70 1.0 to 1.5 2.0 to 2.5

15.88 1.0 to 1.5 2.0 to 2.5

<Tightening connection>

Align the centers of the connecting pipes and tighten
the flare nut as far as possible with your fingers. Then
tighten the nut with a spanner and torque wrench as
shown in the figure.

CAUTION

• Do not apply excess torque.

• Otherwise, the nut may crack depending on the

conditions.

Warp

Strong

wind

Fig. 8-5-1

– 38 –

FILE NO. SVM-08032

(Unit : N·m)

Outer dia.

of copper pipe

Tightening torque

∅6.35 mm 16 to 18 (1.6 to 1.8 kgf·m)
∅12.70 mm 50 to 62 (5.0 to 6.2 kgf·m)
∅15.88 mm 65 to 80 (6.5 to 8.0 kgf·m)

• Tightening torque of flare pipe connections

Flare at indoor unit side

Flare at outdoor unit side

Fig. 8-5-4

Flare nutHalf union

Externally
threaded side

Use a wrench to secure.

Use a torque wrench to tighten.

Internally
threaded side

Fig. 8-5-5

CAUTION

•

KEEP IMPORTANT 4 POINTS FOR PIPING WORK

(1) Take away dust and moisture (Inside of the

connecting pipes.)
(2) Tight connection (between pipes and unit)
(3) Evacuate the air in the connecting pipes using

VACUUM PUMP.
(4) Check gas leak (connected points)

8-5-3. Evacuating

After the piping has been connected to the indoor unit,
you can perform the air purge together at once.

AIR PURGE

Evacuate the air in the connecting pipes and in the
indoor unit using a vacuum pump. Do not use the
refrigerant in the outdoor unit. For details, see the
manual of the vacuum pump.

<Using a vacuum pump>

Be sure to use a vacuum pump with counter-flow
prevention function so that inside oil of the pump does
not flow backward into pipes of the air conditioner
when the pump stops.

1. Connect the charge hose from the manifold valve to
the service port of the gas side packed valve.

2. Connect the charge hose to the port of vacuum
pump.

3. Open fully the low pressure side handle of the
gauge manifold valve.

4. Operate the vacuum pump to start for evacuating.
Perform evacuating for about 15 minutes if the
piping length is 20 meters. (15 minutes for
20 meters) (assuming a pump capacity of 27 liters
per minute.) Then confirm that the compound
pressure gauge reading is –101 kPa (–76 cmHg).

5. Close the low pressure side valve handle of gauge
manifold.

6. Open fully the valve stem of the packed valves
(both side of Gas and Liquid).

7. Remove the charging hose from the service port.

8. Securely tighten the caps on the packed valves.

Compound pressure gauge

–101 kPa (–76 cmHg)

Handle Lo

Pressure gauge

Manifold valve

Handle Hi
(Keep full closed)

– 39 –

Connecting pipe

Packed valve
at liquid side

Charge hose

Fig. 8-5-6

Charge hose

Vacuum pump adapter
for counter-flow
prevention

Vacuum

pump

Packed valve at gas side

Service port (Valve core (Setting pin))

FILE NO. SVM-08032-1

TO CHARGE REFRIGERANT

Refrigerant

No need to charge
extra refrigerant

Need to charge Over 15 m up to Over 15 m up to
extra refrigerant 25 m (30 g/m) 20 m (20 g/m)

24 class 18 class

15 m or less 15 m or less

<Packed valve handling precautions>

• Open the valve stem all the way out; but do not try
to open it beyond the stopper.

• Securely tighten the valve stem cap with torque in
the following table:

Gas side Tightening torque A

Gas side 65 to 80 N·m 4 mm
(∅15.88 mm) (6.5 to 8.0 kgf·m)

Gas side 60 to 62 N·m 4 mm
(∅12.70 mm) (6.0 to 6.2 kgf·m)

Liquid side 16 to 18 N·m Same as
(∅6.35 mm) (1.6 to 1.8 kgf·m) Gas side

<Stripping length of connecting cable>

For 18 Class

Terminal block

LN1 32

Earth line
Cord clamp

Power supply cord

For 24 Class

Terminal block

LN1 32

Terminal screw

Cord clamp

Power supply cord

Terminal screw

Screw

Cord clamp

Connecting cable

Earth line

Screw

Cord clamp

Connecting cable

L

10

70

Power supply cord

N

L

10

60

Power supply cord Connecting cable

Fig. 8-5-8

N

10

Earth line

10

100

Earth line

80

60

Connecting cable

10

70

123

10

10

70

123

10

80

Service port

9 to 10 N·m
(0.9 to 1.0 kgf·m)

• Hexagonel wrench : A (Unit : mm)

Hexagonal wrench
is required.

A

Fig. 8-5-7

8-5-4. Wiring connection

1. Remove the valve cover from the outdoor unit.

2. Connect the connecting cable to the terminal as
identified with their respective matched numbers on
the terminal block of indoor and outdoor unit.

3. When connecting the connecting cable to the
outdoor unit terminal, make a loop as shown in the
installation diagram of indoor and outdoor unit, to
prevent water coming in the outdoor unit.

4. Insulate the unused cords (conductors) from any
water coming in the outdoor unit. Proceed them so
that they do not touch any electrical or metal parts.

Model

Power source

Maximum
running current

Plug socket &
fuse rating

Power cord 4 mm2 (H07RN-F or 245 IEC66) or 3.5 mm2 (AWG-12)

24 class 18 class

50Hz, 220-240V~ Single phase

18A 16A

20A 20A

CAUTION

• Wrong wiring connection may cause some
electrical parts burn out.

• Be sure to comply with local codes on running
the wire from indoor unit to outdoor unit (size of
wire and wiring method etc).

• Every wire must be connected firmly.

NOTE: Connecting cable

• Wire type: More than 1.5 mm2 (H07RN-F or
245 IEC66) or 1.3 mm2 (AWG-16)

– 40 –

FILE NO. SVM-08032

8-6. Test Operation

8-6-1. Gas Leak Test

• Check the flare nut connections for gas leaks with

a gas leak detector and/or soapy water.

Flare nut connections
(Indoor unit)

Flare nut connections
(Outdoor unit)

B

A

Valve stem cap connection

Service port cap connection

Valve stem cap connection

Fig. 8-6-1

8-6-2. Test Operation

To test the system, press and hold RESET button for
10 sec. (There will be one short beep.)

8-6-4. Remote Controller A or B Selection

Setting

When two indoor units are installed in the separated rooms, it
is not necessary to change the selector switches.

<Remote control A or B Selection>

• When two indoor units are installed in the same room or

adjacent two rooms, if operating a unit, two units may receive
the remote control signal simultaneously and operate. In this
case, the operation can be preserved by setting either one

indoor unit or remote control to B setting. (Both are set to A

setting in factory shipment.)

• The remote control signal is not received when the settings of

indoor unit and remote control are different.

• There is no relation between A setting/B setting and A room/B

room when connecting the piping and cables.

<Remote Control A-B Selection>

To separate using of remote control for each indoor unit in case

of 2 air conditioner are installed nearly.
the remote control signal simultaneously and operate. In this

Remote Control B Setup.

1. Press RESET button on the indoor unit to turn the air conditioner ON.
2

. Point the remote control at the indoor unit.

3. Push and hold CHK button on the Remote Control by the tip of the
pencil. "00" will be shown on the display.

4. Press MODE during pushing CHK , "B" will show on the display
and"00" will disappear and the air conditioner will turn OFF. The
Remote Control B is memorized.

Note : 1. Repeat above step to reset Remote Control to be A.

2

. Remote Control A have not "A" display.

3. Detault setting of Remote Control from factory is A.

Fig. 8-6-2

8-6-3. Auto Restart Setting

This product is designed so that, after a power
failure, it can restart automatically in the same
operating mode as before the power failure.

Information

The product was shipped with Auto Restart

function in the OFF position.

Turn it ON as required.

<How to Set the Auto Restart>

• Press and hold the RESET button for about 3

seconds. After 3 seconds, three short electric
beeps will be heard to inform you that the Auto
Restart has been selected.

• To cancel the Auto Restart, follow the steps

described in the section Auto Restart Function
on Owner's Manual.

“B” Display
“00” Display

PRESET

ONE-TOUCH

QUIET

FIX Hi-POWER ECO

SWING

TIMER

ON OFF

SLEEP

●

FILTER ● CLOCK

CHK

Fig. 8-6-3

FAN

MODE

COMFORT

SELECT

CLR

SET

●

− 41 −

9. TROUBLESHOOTING CHART

FILE NO. SVM-08032

9-1. T r oub leshooting Pr ocedure :

9-2-2. Incorrect cable connection between Indoor

and outdoor units

Follow the details of 9-2. Basic Check Items.
If there is no trouble corresponding to 9-2, check
whether or not there are faulty parts following

9-4. Self-Diagnosis by Remote Control.

9-2. Basic Check Items

The indoor unit is connected to the outdoor unit with
4 cables. Check that the indoor and outdoor units have
been properly connected with terminals assigned the
same numbers. If the connectors are not properly
connected, the outdoor unit will not operate normally,
or OPERATION lamp and TIMER lamp will blink (5 Hz).

9-2-1. Power supply voltage

The line voltage must be AC 220 – 240 V. If it is not
within this range, the air conditioner may not operate
normally.

9-2-3. Program control

The microcontroller operates as shown in Table 9-2-1
to control the air conditioner. If there are any opera­tional problems, check whether or not the problems
correspond to Table 9-2-1. If they correspond to the
Table, they are not problems with the air conditioner,
but they are indispensable operations to control and
maintain the air conditioner properly.

Table 9-2-1

No. Operation of air conditioner Descriptions

1 When the main power supply is turned

on, the OPERATION lamp on the
indoor unit blinks.

2 The indoor fan motor speed does not

change in the Dry operation.

3 The compressor is not turned off even

though the room temperature is in the
range that the compressor is turned off.

4 The compressor is not turned on and

off even though the thermo control is
operated in the Dry operation.

The OPERATION lamp blinks to indicate that power is turned on. If the
[ ] button is pressed, the lamp stops blinking.

The indoor fan motor speed is automatically controlled in the Dry
operation.

The compressor has a function that it is not turned off for 3 minutes
after it is turned on even though the room temperature is in the range
that the compressor is turned off.

In the Dry operation, the compressor is turned on and off automatically
at the regular intervals, independent of the thermo control.

5

The compressor is not turned on even

though the room temperature is in the
range that the compressor is turned on.

The operation mode changes in the

6

Automatic operation.

7

The Fan only operation continues in the

Automatic operation.

The ECO operation or Hi-POWER

8

operation does not work.

When [Hi POWER] button is pressed,

9

the display on the remote control does
not change at all.

The compressor is not turned on in the restart delay timer (3-minutes
timer) operation. It is also not turned on after the power supply is
turned on because of this timer operation.

In Automatic operation, the room temperature is detected all time
for control fan speed and the operation mode is changed every
15 minutes according to difference between the room temperature
and the preset temperature.

When the room temperature is in the range
(Preset temperature ± 1°C), the Fan only operation is selected.

These operations do not work when the unit is in the Dry
operation or Fan only operation.

The display on the remote control does not change when
[Hi POWER] button is pressed. However the microcontroller gives
commands to change the preset temperature and air flow level.

– 42 –

FILE NO. SVM-08032

9-3. Primary Judgement

9-3-1. Role of indoor unit controller

The indoor unit controller receives the operation
commands from the remote control and executes
them.

• Temperature measurement at the air outlet of the
indoor heat exchanger by the indoor temperature
sensor

• Temperature setting of the indoor heat exchanger by
the heat exchanger sensor

• Louver motor control

• Indoor fan motor operation control

• LED display control

• Transfering of operation commands to the outdoor

unit

Table 9-3-1

Lamps Self-diagnosis

A OPERATION lamp is blinking. (1 Hz)
B OPERATION lamp is blinking. (5 Hz)
C OPERATION lamp is blinking. (5 Hz)
D OPERATION lamp is blinking. (5 Hz)
E OPERATION lamp is blinking. (5 Hz)
F OPERATION and TIMER lamps are blinking.

(5 Hz)

9-3-2. Failure diagnosis

The indoor unit diagnoses the operation condition and
indicates the information of the self-diagnosis with the
lamps on the display panel of the indoor unit.

Power failure (when the power supply is turning on)
Thermo sensor (TA) short or break
Heat exchanger sensor (TC) short or break
Indoor fan motor lock or failure
Indoor P.C. board failure
Wrong wiring of connecting cable

G OPERATION and TIMER .

(or FAN ONLY for cooling only model) lamps
are blinking.

Table 9-3-2 Diagnosis by detective operation

Symptom Check Primary judgement

The remote control
does not work.

The outdoor fan
does not rotate.

Turn off the power supply once,
then turn it on. Try to operate
the remote control.

The compressor operates.

The compressor does not operate.

Cycle failure

• Gas shortage or other refrigerant cycle trouble

• Heat exchanger sensor open, break or short

• Overload relay or thermostat trouble of compressor

The remote control
still does not work.

The remote control
works.

The indoor unit (and/or remote
control) is/are defective .

OK.

The outdoor unit (Outdoor fan
motor) is defective .

An internal part of the
compressor or P.C. board is
defective.

– 43 –

FILE NO. SVM-08032

9-4. Self-Diagnosis by Remote Controller (Check Code)

1. If the lamps are indicated as shown B to E in Table 9-3-1, execute the self-diagnosis by the remote controller.

2. When the remote controller is set to the service mode, the indoor controller diagnoses the operation condi­tion and indicates the information of the self-diagnosis on the display of the remote controller with the check
codes. If a fault is detected, all lamps on the indoor unit will flash at 5Hz and it will beep for 10 seconds
(Beep, Beep, Beep ... ). The timer lamp usually flashes (5Hz) during self-diagnosis.

9-4-1. How to Use Remote Controller in Service Mode

1

Press [CHECK] button with a tip of pencil to set the
remote controller to the service mode.

• “ ” is indicated on the display of the remote
controller.

PR E S E T

ON E- TOU CH

QU IE T

S WIN G

TI ME R

SL E E P

C HK

TOSHIBA

FA N

TE MP

TEMP

MOD E

C OMF OR T

S LE E P

FI X H i-P OW ER EC O

ON

OF F

FI LT E R

C LO CK

2

Press [ON ] or [OFF ] button

If there is no fault with a code, the indoor unit will beep
once (Beep) and the display of the remote controller will
change as follows :

• • •

• The TIMER indicator of the indoor unit flashes continuously.

(5 times per 1 sec.)

• Check the unit with all 52 check codes ( to )
as shown in Table-11-4-1.

• Press [ON ] or [OFF ] button to change the check
code backward.

CL R

SE T

If there is a fault, the indoor unit will beep for 10
seconds (Beep, Beep, Beep...).

Note the check code on the display of the remote
controller.

• 2-digits alphanumeric will be indicated on the display.

• All indicators on the indoor unit will flash.

(5 times per 1 sec.)

Alphanumeric characters are
used for the check codes.
is 5. is 6.
is A. is B.
is C. is D.

Press [CLR] button. After service finish for clear

3

service code in memory.

• "7F" is indicated on the display of the remote

control.

Press [ ] button to release the service mode.

4

• The display of the remote controller returns to as it

was before service mode was engaged.

Fig. 9-4-1

– 44 –

Table 9-4-1

Block level Diagnosis function

Check

code code status

Block

Indoor
P.C. board

Cable
connection

Outdoor
P.C. board

Other parts
(including
compressor)

Check

Symptom

The indoor thermo sensor (TA) is
defective.
Disconnection or short-circuit

The indoor heat exchanger
sensor (TC) is defective.
Disconnection or short-circuit

The indoor fan motor or its circuit
is defective.

The part other than the above
parts on the indoor P.C. board is
defective.
EEPROM access error

IOL operation

The serial signals can not be
transmitted and received between
indoor and outdoor units.

The crossover wire is

•

connected wrongly.
The serial signal transmitting

•

circuit on the outdoor P.C. board
is defective.
The serial signal receiving

•

circuit on the indoor P.C. board
is defective.

The operation command signals
are not transmitted from the
indoor unit to the outdoor unit.

The outdoor thermo sensor (TE)
is defective.
Disconnection or short-circuit

The outdoor heat exchanger (TD)
sensor is defective.
Disconnection or short-circuit

The reply serial signal has been
transmitted when starting the
unit, but stops being transmitted
shortly after.

1. Compressor thermo operation

•

Gas shortage

• Gas leak

2. Instantaneous power failure

The discharge temperature is
over 120°C.

The IOL operation is defective.

Unit

Operation
continues.

Operation
continues.

All off

Operation
continues.

All off

Operation
continues.

Operation
continues.

All off

All off

Operation
continues.

All off

All off

Condition

The lamp on the
indoor unit blinks
when error is
defected.

The lamp on the
indoor unit blinks
when error is
defected.

The lamp on the
indoor unit blinks
when error is
defected.

The lamp on the
indoor unit blinks
when error is
defected.

The lamp on the
indoor unit blinks
when error is
defected.

The lamp on the
indoor unit blinks
when error is
defected.

The lamp on the
indoor unit blinks
when error is
defected. And it
returns to the
normal condition
when recovering
from errors.

The lamp on the
indoor unit blinks
when error is
defected.

The lamp on the
indoor unit blinks
when error is
defected.

The lamp on the
indoor unit blinks
when error is
defected. And it
returns to the
normal condition
when recovering
from errors.

The lamp on the
indoor unit blinks
when error is
defected.

The lamp on the
indoor unit blinks
when error is
detected.

FILE NO. SVM-08032

Judgement and action

1. Check the indoor thermo sensor (TA).

2. Check the indoor P.C. board.

1. Check the indoor heat exchanger
sensor (TC).

2. Check the indoor P.C. board.

1. Check the connector circuit of the
indoor fan motor (CN10).

2. Check the indoor fan motor.

3. Check the indoor P.C. board.

1. Check the indoor P.C. board.
(EEPROM and peripheral circuits)

Overload operation of refrigerating cycle

1. In the case of the outdoor unit not
operating at all;

•

Check the crossover cable and
connect it properly.

•

Check the outdoor P.C. board.

2. In the case of the outdoor unit operating
normally;

•

Check whether or not both of serial
LED (Green) and serial LED (Orange)
is blinking.
If the serial LED (Green) is not
blinking, check the outdoor P.C. board.
If the serial LED (Orange) is not
blinking, check the indoor P.C. board.

If the operation command signals continue
to be transmitted between 2 and 3 of the
indoor terminal block, replace the outdoor
P.C. board.

1. Check the outdoor thermo sensor (TE).

2. Check the outdoor P.C. board.

1. Check the outdoor heat exchanger
sensor (TD).

2. Check the outdoor P.C. board.

1. Repeatedly turn the indoor unit on and
off with the interval of approx. 10 to 40
minutes. (The check code is not
indicated during operation.) And supply
gas. (Check gas leak.)

2. The indoor unit operates normally
during the check.
If the reply serial signal continues to be
transmitted between 2 and 3 of the
indoor terminal block, replace the
outdoor P.C. board.
If the signal stops between them,
replace the indoor P.C. board.

1. Check the heat exchanger sensor (TD).

2. Gas purging

When turning on the unit, the normal
phase (RST) is detected but T-R waveform
has not been detected for 120 seconds or
more.

− 45 −

9-5. Troubleshooting for Indoor unit

Operation

Measure

Item by symptoms

Check item

Conceivable principle

cause

9-5-1. Power can not be turned on. (The unit does not operate at all.)

<Primar check>

(1) Is the supply voltage normal?
(2)Is the connection to the AC output OK?
(3) Is the fuse (F01) blown?

Turn off power
supply once, and 5
second later, turn it

on again.

NO

Is OPERATION

lamp blinking?

YES

Does

transmission

mark on

remote

control flash

normally, and

is its signal
transmitted

properly?

YES

Does the fan

between 1

and

Microconlroler

Is DC 310 -

340V across

C27(for 18SKPX,

18SKPX-V and

18SKP-E)

C03 (for 24SKPX

and 24SKP-E)?

YES

NO

NO

Is fuse (F01)

of indoor

control board

blown?

NO

Is voltage (DC

12V or 5V)

indicated on

rear of indoor

control board

normal?

Is it possible to

turn on power

supply by

pressing

[ ]

button on remote

control?

YES

Parts (C25, C26,

SG01, DB01, R62,

R63, T01 and IC02

for 18SKPX,18SKPX-V

YES

YES

and 18SKP-E)

(C01, C02, SG01,
DB01, R09, R10, T01
and IC10 for 24SKPX
and 24SKP-E) are

defective.

NO

NO

motor

connector

short-

3

circuit?

NO

defective.

FILE NO. SVM-08032

Remote control is

defective.

Refer to 9-8

"Troubleshooting for

Remote Control."

Unit operates

normally.

YES

Replace main P.C.

board.

Are DC 12V,

across C32

(for 18SKPX,

18SKPX-V and

18SKP-E)

C27 (for 24SKPX

and 24SKP-E)?

YES

NO

Turn off breaker
once and turn it

on again after

removing motor.

Are DC 12V,
across C32

(for 18SKPX,

18SKPX-V and

18SKP-E)

C27 (for 24SKPX

and 24SKP-E)?

YES

– 46 −

NO

T01 is defective.

Replace motor.

FILE NO. SVM-08032

9-5-2. Only indoor fan motor does not operate.

<Primary check>

(1) Is it possible to detect the power supply voltage (200 – 240 V) between 1 and 2 on the terminal block?
(2) Does the indoor fan motor operate in cooling operation?

RAS-18SKPX, RAS-18SKPX-V, RAS-18SKP-E

Shut off the

power supply once.

Turn the power supply.

Does the fan stop in

no operating status?

YES

Start the operation
with low fan setting

in cool operation.

Does the fan rotate?

YES

Change the setting of

cooling to high fan.

Does the fan speed

become higher?

YES

NO

NO

NO

Control P.C. board is defective.

Does AC 120V

or higher voltage apply

to between red and black

lead of fan motor?

YES

Shut off the power supply.

Does the cross flow
fan rotate normally?

YES

Turn on the power supply.

Operation

stops

NO

NO

Replace the P.C. board.

Does connecting

terminal, connecting

cable or power supply

cord completely?

Does not found the short

wire about connecting

cable and power cord?

YES

Repair the

bearing of

the fan.

Motor control circuit failure

(IC30, IC03, D38, R25, R26, Q17)

or 12V power circuit failure.

Replace the P.C. board.

NO

Normal

Is the rotation signal (DC+12V-0V)
output between 2 (gray lead wire)

and 3 (brown lead wire) of the motor

connector (CN11) when rotating
the cross flow fan by hand in no

operating status?

(1 pulse/one turn)

YES

Replace the control

P.C. board.

– 47 –

NO

Replace the fan motor

Replace connecting

the cable (or power cord),

and terminal block.

RAS-24SKPX, RAS-24SKP-E

FILE NO. SVM-08032

[ ]

– 48 –

9-5-3. Compressor does not operate.
<Primary check>

(1) Is the preset temperature higher than the room temperature in cooling operation?
(2) Is the crossover cable connected properly?

<Inspection procedure>

RAS-18SKPX, RAS-18SKPX-V, RAS-18SKP-E

Turn on power supply.

FILE NO. SVM-08032

Does OPERATION

lamp blink?

YES

Does miniature relay RY02

switch on and off due to

temperature changes?

YES

Is it possible to detect AC

220 – 240V between 2

and 3 on terminal block?

YES

Are all of compressor cords normal?

YES

Is compressor motor winding

normal?

(Check winding resistor.)

YES

Is capacitor for compressor normal?

NO

NO

NO

Is resistance value of thermo

sensor (TA) and heat ex-

changer sensor (TC) normal?

YES

Microcomputer is defective.

Miniature relay RY02 is

defective.

NO

NO

NO

Compressor is defective.

NO

Capacitor is defective.

Refer to 9-5-1 “Power

can not be turned on”.

Thermo sensor or

heat exchanger

sensor is defective.

Replace thermo sensor

or heat exchanger

sensor.

Replace P.C. board.

Rewire or replace

defective cords.

Replace compressor.

Replace capacitor.

YES

Is overload relay normal?

YES

Does compressor start?

YES

Does compressor stop after a while?

YES

Is gas quantity normal?

(Check gas pressure.)

YES

Compressor is defective.

YES

Replace P.C. board.

NO

NO

NO

Overload relay is

defective.

Compressor is defective.

Gas shortage (Gas leak)

– 49 –

Replace overload relay.

Replace compressor.

Supply gas.

RAS-24SKPX, RAS-24SKP-E

Turn on power supply.

FILE NO. SVM-08032

Does OPERATION

lamp blink?

YES

Does miniature relay RY03

switch on and off due to

temperature changes?

YES

Is it possible to detect AC

220 – 240V between 2

and 3 on terminal block?

YES

Are all of compressor cords normal?

YES

Is compressor motor winding

normal?

(Check winding resistor.)

YES

Is capacitor for compressor normal?

NO

NO

NO

Is resistance value of thermo

sensor (TA) and heat ex-

changer sensor (TC) normal?

YES

Microcomputer is defective.

Miniature relay RY03 is

defective.

NO

NO

NO

Compressor is defective.

NO

Capacitor is defective.

Refer to 9-5-1 “Power

can not be turned on”.

Thermo sensor or

heat exchanger

sensor is defective.

Replace thermo sensor

or heat exchanger

sensor.

Replace P.C. board.

Rewire or replace

defective cords.

Replace compressor.

Replace capacitor.

YES

Is overload relay normal?

YES

Does compressor start?

YES

Does compressor stop after a while?

YES

Is gas quantity normal?

(Check gas pressure.)

YES

Compressor is defective.

YES

Replace P.C. board.

NO

NO

NO

Overload relay is

defective.

Compressor is defective.

Gas shortage (Gas leak)

Replace overload relay.

Replace compressor.

Supply gas.

– 50 –

<Inspection procedure>

Turn on power supply.

FILE NO. SVM-08032

Does OPERATION

lamp blink?

YES

Is it possible to start

unit by remote control?

YES

Is it possible to detect AC 200V

between 2 and 3 on terminal block?

YES

Is crossover cable normal?

YES

Are all of compressor cords normal?

YES

Is resistance of compressor motor

windining normal?

YES

Is capacitor for compressor normal?

YES

NO

NO

NO

NO

NO

NO

NO

Compressor is defective.

Capacitor is defective.

Refer to item Power

can not be turned on .

Refer to 9-9 Troubleshooting

for Remote Control .

Replace P.C. Board

Connect crossover

cable properly.

Rewire or replace

defective cords.

Replace compressor.

Replace compressor.

Is overload relay normal?

YES

Does compressor start?

YES

Does compressor stop after a while?

YES

Is gas quantity normal?

(Check gas pressure.)

YES

Compressor is defective.

YES

Replace Compressor

NO

NO

NO

Overload relay is defective.

Compressor is defective.

Gas shortage (Gas leak)

Replace overload relay.

Replace compressor.

Supply gas.

− 51 −

FILE NO. SVM-08032

9-6. Troubleshooting for Wiring (Interconnect cable and Serial Signal Wire)

9-6-1. Outdoor unit does not operate.
<Inspection procedure>

(1) Is the voltage between and of the indoor terminal block varied?

1

(2) Are signals from the indoor unit to the outdoor unit transmitted correctly based upon the following diagram?

NOTE:

 Measure the voltage for 2 minutes and 30 seconds after starting the unit.


Terminal block on indoor side

Red

2

3

White

2

1

Terminal block

Tester

Fig. 9-6-1

Normal condition : After start operated about 2 minutes and 30 seconds. Voltage between 2 and 3 of the

of the indoor's Terminal block should be equal AC 220 ~ 240V

Abnormal condition : Don't found voltage AC 220 ~ 240V from terminal block (0V)

9-6-2. Outdoor unit stops a while after starting the unit.

<Confirmation procedure> Select one of 3 cases below and follow the procedure.

(1) The outdoor unit stops between 10 and 20 minutes passed after starting and it takes 10 minutes or more to

restart the unit.

Gas has a low circulation.

Measure gas pressure.

Gas shortage
Gas leak
Pipe clogging

Compressor is turned off and on automatically by thermo sensor

(Heat pump Model) or thermostat (Cooling only Model).

(2) The outdoor unit stops once, it would not operate until the power is turned on again.

Refer to 9-5-4 "Compressor does not operate"

(3) The outdoor unit stops between 10 minutes to 1 hour after starting and a check code is indicated on the

remote control. (Check code 03-1E : Refer to Table 9-4-1.)

− 52 −

FILE NO. SVM-08032

9-7. Troubleshooting for P.C. board

<Inspection procedure>

(1) If the P.C. board is defective , check for disconnec-

9-7-1. How to check indoor P.C. board

<Cautions for handling P.C. board>

tion, burn or discoloration of the copper foil pattern
of the P.C. board.

(2) The P.C. board consists of the following 2 parts:

(1) When removing the front panel and the P.C. board,

be sure to turn off the power supply.

(2) When removing the P.C. board, hold the edge of

the P.C. board and do not apply force to the parts.

(3) When connecting or disconnecting the connectors

on the P.C. board, hold the housing. Do not pull at

a. Main P.C. board parts.

Power relay, indoor fan motor drive circuit and
control circuit, C.P.U. and peripheral circuits, buzzer
drive circuit and buzzer.

b. Infrared rays parts:

Infrared rays receiving circuit

lead wires.

Check the defects of the P.C. board with Table 9-7-1.

RAS-18SKPX, RAS-18SKPX-V, RAS-18SKP-E

Table 9-7-1 Inspection procedure

No. Procedure Check points Causes

1 Turn off the power supply and

remove the P.C. board assembly
from electric parts base. Remove
the connecting cables from the
terminal block.

Check whether or not the fuse (F01)
is blown.

Impluse voltage was applied or the
indoor fan motor short-circuited.

2 Remove the connector of the motor

and turn on the power supply. If
OPERATION lamp blinks (once per
second), it is not neccessary to
check steps (1 to 3) in the right
next column.

3 Press [ ] button once

to start the unit. (Do not set the
mode to Fan Only or On-Timer
operation).

4 Shorten the line of the restart delay

timer and start unit.

Check power supply voltage;

1. Between pin 1 - 2 of CN33
(220 − 240 V AC) : Except

2. Between + and −
(DC310 − 340 V)

3. Between 12 V and GND

4. Between 5 V and GND

1. Between collector of Q02 and
GND (for relay coil (DC12 V))

2. Between 2 and 3 of terminal
block for connecting cable

Check whether or not all lamps
(OPERATION, Auto restart,
TIMER PAP, FILTER and Hi-power)
are indicated for 3 seconds and they
return to normal 3 seconds later.

of CN27

1. The terminal block or the
crossover cable is connected
wrongly.

2. The capacitor (C25 and C26 )
line filter (L01), resistor (R64), or
the diode (DB01) is defective.

3. C32 and T01 are defective.

4. IC02, C35 or T01 are defective.

1. The wire of the relay coil (RY02)
comes down or the relay drive
(Q02) is defective.

2. CN27 or RY02 is connected
wrongly.

The lamps are defective or the
housing assembly (CN13) is
defective.

– 53 −

FILE NO. SVM-08032

No. Procedure Check points Causes

5 Press [ ] button once

to start the unit.

• Shorten the time of the restart
delay timer.

• Set the operation mode to COOL.

• Set the fan speed level to AUTO.

• Set the preset temperature must

lower than the room temperature.
(The unit (compressor) operates
continuously in the above
condition.)

1. Check whether or not the
compressor operates.

2. Check whether or not the
OPERATION lamp blinks.

1. The temperature of the indoor
heat exchanger is extremely low.

2. The connection of the heat
exchanger sensor is loose.
(The connector is disconnected.)
(CN01)

3. The heat exchanger sensor and
the P.C. board are defective.
(Refer to Table 9-7-2.)

4. The main P.C. board is defective.

6 If the above condition (No. 5) still

continues, start the unit in the
following condition.

• Set the operation mode to HEAT.

• Set the preset temperature must

higher than room temperature.

7 Connect the motor connector to the

main P.C. borad and turn on the
power supply. Start the unit in the
following condition.

• Set the operation mode to FAN.

• Set the fan speed level to HIGH.

(The unit (compressor) operates
continuously in the above codition.)

1. Check whether or not the
compressor operates.

2. Check whether or not the
OPERATION lamp blinks.

1. Check it is impossible to detect the
voltage (DC 12 V) between and6

3 of the motor terminals.

2. The motor does not operate.
(But it is possible to receive the
signal from the remote control.)

3. The motor rotates but vibrates
strongly.

1. The temperature of the indoor
heat exchanger is extremely high.

2. The connector of the heat
exchanger sensor short-circuited.
(CN01)

3. The heat exchanger sensor and
the P.C. board are defective. (Refer
to Table 9-7-2.)

4. The main P.C. board is defective.

1. The indoor fan motor is defective.
(Protected operation of P.C. board)

2. The connection of the motor
connector is loose.

3. The P.C. board is defective.

.

– 54 −

FILE NO. SVM-08032

RAS-24SKPX, RAS-24SKP-E

Table 9-7-1 Inspection procedure

No. Procedure Check points Causes

1 Turn off the power supply and

remove the P.C. board assembly
from electric parts base. Remove
the connecting cables from the
terminal block.

Check whether or not the fuse (F01)
is blown.

Impluse voltage was applied or the
indoor fan motor short-circuited.

2 Remove the connector of the motor

and turn on the power supply. If
OPERATION lamp blinks (once per
second), it is not neccessary to
check steps (1 to 3) in the right
next column.

3 Press [ ] button once

to start the unit. (Do not set the
mode to Fan Only or On-Timer
operation).

4 Shorten the line of the restart delay

timer and start unit.

5 Press [ ] button once

to start the unit.

• Shorten the time of the restart
delay timer.

• Set the operation mode to COOL.

• Set the fan speed level to AUTO.

• Set the preset temperature must

lower than the room temperature.
(The unit (compressor) operates
continuously in the above
condition.)

Check power supply voltage;

1. Between CN30 and CN31
(220 − 240 V AC) : Except

2. Between + and −
(DC310 − 340 V)

3. Between 12 V and GND

4. Between 5 V and GND

Check power supply voltage;

1. Between collector of Q08 and
GND (for relay coil (DC12 V))

2. Between 2 and 3 of terminal
block for connecting cable

Check whether or not all lamps
(OPERATION, Auto restart,
TIMER PAP, FILTER and Hi-power)
are indicated for 3 seconds and they
return to normal 3 seconds later.

1. Check whether or not the
compressor operates.

2. Check whether or not the
OPERATION lamp blinks.

of C03

1. The terminal block or the
crossover cable is connected
wrongly.

2. The capacitor (C01 and C02 )
line filter (L01), resistor (R09), or
the diode (DB01) is defective.

3. C27, T01 and IC01 are defective.

4. IC10, C30, C11 or T01 are

defective.

1. The wire of the relay coil (RY03)
comes down or the relay drive
(Q08) is defective.

2. CN27 or RY03 is connected
wrongly.

The lamps are defective or the
housing assembly (CN13) is
defective.

1. The temperature of the indoor
xchanger is extremely low.

heat e

2. The connection of the heat

exchanger sensor is loose.
(The connector is disconnected.)
(CN01)

3. The heat exchanger sensor and

the P.C. board are defective.
(Refer to Table 9-7-2.)

4. The main P.C. board is defective.

6 Connect the motor connector to the

main P.C. borad and turn on the
power supply. Start the unit in the
following condition.

• Set the operation mode to FAN.

• Set the fan speed level to HIGH.

(The unit (compressor) operates
continuously in the above codition.)

1. Check it is impossible to detect the
voltage (DC 12 V) between and6

3 of the motor terminals.

2. The motor does not operate.
(But it is possible to receive the
signal from the remote control.)

3. The motor rotates but vibrates
strongly.

– 55 −

1. The indoor fan motor is defective.
(Protected operation of P.C. board)

2. The connection of the motor
connector is loose.

3. The P.C. board is defective.

FILE NO. SVM-08032

Table 9-7-2. Approximate resistance value of thermo sensor

Temperature 0°C10°C20°C25°C30°C

Resistance value 33.8 20.35 12.59 10.00 7.99

9-7-2. How to shorten time of restart delay timer

1 Press [SET] button while pressing [CHECK] button

with a tip of a pencil.

2 Then press [

indoor unit.

] button to transmit the signal to the

(kΩ)

PRESET

ONE-TOUCH

QUIET

SWING

TIMER

SLEEP

CHK

FIX Hi-POWER ECO

ON

TEMP

FILTER

OFF

FAN

MODE

COMFORT

CLOCK

SLEEP

CLR

SET

2

1

9-7-3. How to set/cancel self cleaning function

The self cleaning function is set from a factory. To cancel this function, should keep press the RESET button on
Indoor unit for 20 seconds till can hear the long combination sound and repeat the same procedure when need
to set.

– 56 −

9-8. Troubleshooting for Remote Control

FILE NO. SVM-08032

Is receiver on

indoor unit exposed

to direct sunlight?

YES

NO

Is there any

thyristor fluorescent

light nearly?

YES

YES

NO NO

Press [ ]

button.

Is transmission

mark indicated?

Does indoor unit

operate when

moving remote control

near receiver or

indoor unit?

YES

Batteries are

exhausted.

The unit does not beep at all.
OPERATION lamp on
indoor unit is not indicated.

NO

Press RESET button

on remote control

with tip of pencil.

Press [ ]

button.

Avoid direct

sunlight.

Keep indoor unit

away from

thyristor

fluorescent light.

Does indoor unit

NO

start to operate by

automatic restart

function?

YES

Does radio sound

is affected by

remote control when

a signal is transmitted

at distance of 5 cm

from radio?

P.C. board is

defective.

Replace

P.C. board.

YES

NO

NO

Replace

batteries.

Note : After replacing batteries,

press the RESET button
with a tip of a pencil.

– 57 –

Is transmission mark

indicated?

YES

Does indoor unit

beep and operate?

YES

Normal

operation

NO

Remote control

is defective.

Replace

remote control.

FILE NO. SVM-08032

10. HOW TO REPLACE THE MAIN PARTS

WARNING

• Since high voltages pass through the electrical parts, turn off the power without fail before proceeding with
the repairs.

Electric shocks may occur if the power plug is not disconnected.

• After the repairs have been completed (after the front panel and cabinet have been installed), perform a
test run, and check for smoking, unusual sounds and other abnormalities.

If this check is omitted, a fire and/or electric shocks may occur.
Before proceeding with the test run, install the front panel and cabinet.

• Ensure that the following steps are taken when doing repairs on the refrigerating cycle.

1. Do not allow any naked flames in the surrounding area.

If a gas stove or other appliance is being used, extinguish the flames before proceeding.
If the flames are not extinguished, they may ignite any oil mixed with the refrigerant gas.

2. Do not use welding equipment in an airtight room.

Carbon monoxide poisoning may result if the room is not properly ventilated.

3. Do not bring welding equipment near flammable objects.

Flames from the equipment may cause the flammable objects to catch fire.

• If keeping the power on is absolutely unavoidable while doing a job such as inspecting the cir-

cuitry, wear rubber gloves to avoid contact with the live parts.

Electric shocks may be received if the live parts are touched.
High-voltage circuits are contained inside this unit.

Proceed very carefully when conducting checks since directly touching the parts on the control circuit
board may result in electric shocks.

10-1. Indoor Unit

No.



Part name

Front panel

Procedures

1) Stop operation of the air conditioner and
turn off its main power supply.

2) Open the air inlet grille, push the arm
toward the outside, and remove the grille.

3) Remove the left and right air filters.

Remarks

– 58 –

FILE NO. SVM-08032

No.Part name

Front panel

Procedures

4) Press "PUSH" part under the front panel

and remove hooks of the front panel from
the installation plate.

5) Remove the front panel fixing screws.
(4 pcs.)

6) Take off four hooks of panel from rear
side.

Remarks

Installation plate

Front panel

Press

4 Screw

2 Screws

Three hooks

Four hooks

<How to assemble the front panel>

1) Press three center positions and two lower center positions of the air outlet, and
then hang the hanging hooks (4 pcs.) at the top side of the front panel to the rear
plate.

2) Tighten four screws.

• Incomplete hanging or incomplete pressing may cause a dewdrops.

– 59 –

FILE NO. SVM-08032

No. Part name

Electric parts



box assembly

Procedures

1) Remove screw of earth lead attached to the
end plate of the evaporator.

2) Remove the lead wire cover, and remove
connector for the fan motor and connec­tor for the louver motor from the electric
parts box assembly.

3) Pull out TC sensor from sensor holder of the
evaporator.

4) Disengage the display unit by simply pushing
at the top of the display unit.

5) Remove the fixing screw that secures the
electric parts box assembly, LED assembly

and remove the assembly.

Remarks

Electric part
box cover

TC sensorEarth Screw

Fan motor
connector

Louver
motor

connector

Fixing screw

<How to assemble the electric parts box>

1) Hook the top part of the electric parts box
assembly onto the claws on the back body,
and secure it using the fixing screw.
Now attach the display unit. Connect the
connectors for the fan motor and louver motor.

2) Secure the grounding wire using the fixing
screw. Insert the TC sensor into the sensor
holder.

* Be absolutely sure to loop the grounding

wire and TC sensor leads once at the
bottom.

Fixing screw

LED assembly

– 60 –

FILE NO. SVM-08032

No. Part name

Horizontal louver



Evaporator



(Heat exchanger)

Procedures

1) Remove shaft of the horizontal
louver from the back body.
(First remove the left shaft, and
then remove other shafts while
sliding the horizontal louver
leftward.)

1) Follow to the procedure in the item .

2) Remove the pipe holder from the rear side of the main unit.

3) Remove two fixing screws at the left side of the end plate of the heat exchanger.

2 Screws



Remarks

4) Remove two fixing screw on the
heat exchage fixing holder to separate the
heat exchage from the back body.

Screw

Screw

– 61 –

FILE NO. SVM-08032

No. Part name

Bearing



Procedures

1) Follow to the procedure in the item .



2) Remove the two screws used to secure the
bearing base.

3) Remove the bearing base.

<Caution at assembling>

• If the bearing is out from the housing, push it

into the specified position and then incorporate
it in the main body.

Two screws

Two

screws

Bearing

Remarks

Bearing base

Bearing base

Bearing

– 62–

FILE NO. SVM-08032

No. Part name

Fan motor



Procedures

1) Follow to the procedure till item .



2) Loosen the set screw of the cross flow fan.

3) Remove two fixing screws of the motor cover

and them remove the motor cover.

4) Remove two more fixing screws of the
motor band and remove the motor band.

Remarks

Set screw

5) Pull the fan motor outward.

Two screws on

motor cover

Two screws on

motor band

– 63 –

FILE NO. SVM-08032

No. Pa rt name

Cross flow fan



Procedures

<Caution at reassembling>

1) To incorporate the fan motor, remove the fan
motor rubber (at shaft core side), incorporate
the motor into the position in the following
figure, and then install the fan motor.

• Install the cross flow fan so that the right

end of the 1st joint from the right of the
cross flow fan is set keeping 5 mm from
wall of rear plate of the main unit.

• Holding the set screw, install the cross flow

fan so that U-groove of the fan motor comes
to the mounting hole of the set screw.

Remarks

5.0mm

• Perform positioning of the fan motor as

follows:

• When assembling the fan motor, the fan

motor must be installed in such a way that
the fan motor leads will be taken out is
positioned at the bottom front.

• After assembling the two fixing screw of

the motor band (right) into the main body,
position the fan motor, insert it, and then
secure the motor band (right) using the two
fixing screws.

– 64 –

FILE NO. SVM-08032

10-2 Outdoor Unit (RAS-18S2AX, RAS-18S2AX-V, RAS-18S2A-E)

No. Part name Procedures Remarks

1 Common

procedure

1) Stop the operation of the air conditioner and turn off
its main power supply or remove the power supply
cord.

2) Remove the packed valved cover and the electrical

Parts cover

(2 screws ∅ 4 x 10L)

3) Remove 2 cord clamps (4 screws ∅ 4 x 16L) and
disconnect the power supply cord and connecting
cable after removing 6 screws on the terminal block
and 1 ground screw on the electrical parts base.

4) Remove the upper cabinet. (4 scerws ∅ 4 x 10L)
(Pulling out upward)

5) Remove the front cabinet. (3 screws∅ 4 x 10L)
(Pull the front right protion toward you, and remove

it pulling out upward.)

2 screws ∅4 x 10L

Packed valve cover

Upper
cabinet

2 Cord clamps

4 screws ∅4 x 16L

Running

2

capacitor
for compressor

Running

3

capacitor
for fan motor

4

Magnetic contactor

5

Spark killer

1) Perform the common procedure 1

2) Remove the capacitor band. (1 screw ∅4 x 10L)

3) Disconnect the lead wires from the capacitor
terminal.

1) Perform the common procedure 1

2) Remove the fixing screw . (1 screw ∅4 x 10L)

3) Disconnect the lead wires from the capacitor
terminal.

1) Perform the common procedure 1

2) Remove the fixing screw. (2 screws ∅ 4 x 10L)

3) Disconnect the lead wires from the terminal.

1) Perform the common procedure 1

2) Remove the fixing screw. (1 screw ∅ 4 x 10L)

3) Disconnect the lead wires from the terminal.

Running capacitor

for fan motor

Running capacitor
for compressor

Front cabinet

Spark killer

Magnetic contactor

− 65 −

FILE NO. SVM-08032

10-3. Outdoor Unit (RAS-24S2AX, RAS-24S2A-E)

No. Part name Procedures Remarks

1 Common

procedure

1) Stop the operation of the air conditioner and turn off
its main power supply or remove the power supply
cord.

2) Remove the packed valve cover and the
electrical parts cover (2 screws ∅4 x 10L)

3) Remove 2 cord clamps (4 screws ∅4 x 16L) and
disconnect the power supply cord and connecting
cable after removing 6 screwson on the terminal
block and 1 ground screw on the electrical parts
base.

4) Remove the top cabinet. (7 screws ∅ 4 x 10L)
(Pulling out upward)

5) Remove the top cabinet. (2 screws ∅ 4 x 10L)
(Pull the front right portion toward you, and
remove it pulling out upward)

Front cabinet

2 screws

∅4 x 10L

Packed valve cover

Top cabinet

Side
cabinet

4 screws ∅4 x 16L

7 screws ∅ 4 x 10L



2 Cord clamps

– 66 –

Front
cabinet

FILE NO. SVM-08032

No.

2 Running

3 Running

4 Magnetic

5 Spark killer

Part name

capacitor
for compressor

capacitor
for fan motor

contactor

Procedures

1) Perform the common procedure 1

2) Remove the capacitor band. (1 screw ∅4 x 10L)

3) Disconnect the lead wires from the capacitor
terminal.

1) Perform the common procedure 1

2) Remove the fixing screw . (1 screw ∅4 x 10L)

3) Disconnect the lead wires from the capacitor
terminal.

1) Perform the common procedure 1

2) Remove the fixing screw. (2 screws ∅4 x 18L)

3) Disconnect the lead wires from the terminal.

1) Perform the common procedure 1

2) Remove the fixing screw. (1 screws ∅4 x 10L)

3) Disconnect the lead wires from the terminal.

Remarks

Running capacitor
for compressor

Running capacitor
for fan motor

Spark killer

Magnetic contactor

– 67 –

11. EXPLODED VIEWS AND PARTS LIST

11-1. Indoor Unit (E-Parts Assy)

FILE NO. SVM-08032

411

403

404

402

407

Location Part Location Part

Description Description

405

No. No. No. No.

402 43T60331 TERMINAL; 3P
403 43T50004 SENSOR; HEAT EXCHANGER
404 43T69005 SENSOR;THERMOSTAT
405
407 43T62003 CORD CLAMP

43T69736 UNIT- LED-ACCEP

411 43T69729 ASM-PCB-SERV (FOR 18SKPX,

411 43T69730 ASM-PCB-SERV (FOR 24SKPX,

414 43T69747 ASM-STEPPING-MOTOR
415 43T60386 MOTOR CORD

415

414

18SKPX-V, 18SKP-E)

24SKP-E)

– 68 –

11-2. Indoor Unit

204

201

216

211

217

209

210

FILE NO. SVM-08032

215

203

207

205

212

218

219

206

213

208

214

202

204

220

221

222

Location Part Location Part

Description Description

No. No. No. No.

201 43T00507 FRONT PANEL ASSY

213 43T39022 BAND, MOTOR, RIGHT UP
202 43T09439 GRILLE OF AIR INLET ASSY
203 43T03366 BACK BODY ASSY

214 43T39331

(FOR 18, 24SKPX, 18SKPX-V)

203 43T03368

BACK BODY ASSY (FOR 18, 24SKP-E)

214 43T39023 BAND, MOTOR, RIGHT DOWN
204 43T80019 AIR FILTER
205 43T09040 LOUVER, HORIZONTAL

215 43T44419 REFRIGERATION CYCLE ASSY
206 43T70313 HOSE, DRAIN

207 43T79313 CAP, DRAIN

215 43T44420 REFRIGERATION CYCLE ASSY
208 43T21370 MOTOR FAN (For Part 43T21359)

208 43T21371

209 43T20016
210 43T39332

211 43T22312
212 43T39020
213 43T39330

(FOR 18SKPX, 18SKPX-V, 18SKP-E)
MOTOR, FAN

(FOR 24SKPX, 24SKP-E)

FAN, ASSY, CROSS FLOW
REFRIGERATION CYCLE ASSEMBLY
BEARING ASSY, MOLD
BAND, MOTOR, LEFT
MOTOR BAND (RIGHT, UP) ASSY

216 43T19333 HOLDER, SENSOR

217 43T49010 PIPE, SHIELD

218 43T82008 PLATE, INSTALLATION

219 43T49043 HOLDER, PIPE

220 43T62031 COVER, TERMINAL

221 43T69616 WIRELESS REMOTE CONTROL

222 43T83003 HOLDER, REMOTE CONTROL

(FOR 18SKPX, 18SKPX-V, 18SKP-E)

Electric Parts Assembly

(FOR 24SKPX, 24SKP-E)
MOTOR BAND (RIGHT,DOWN) ASSY
(FOR 18SKPX, 18SKPX-V, 18SKP-E)

(FOR 24SKPX, 24SKP-E)

(FOR 18SKPX, 18SKPX-V, 18SKP-E)

(FOR 24SKPX, 24SKP-E)

– 69 –

11-3. Outdoor Unit (RAS-18S2AX, RAS-18S2AX-V, RAS-18S2A-E)

FILE NO. SVM-08032

Location Part Location Part

No. No. No. No.

1 43T42339 BASE PLATE ASSEMBLY 21 43T04301 PARTITION
2 43T41415 COMP-ASSY(SHX33SC4-U) 22 43T39317 MOTOR BASE CONNECTION PLATE

(MADE IN CHINA) 23 43T39318 MOTOR BASE
7 43T43422 CONDENSER ASSEMBLY 24 43T19330 PACKED VALVE COVER
8 43T00448 FIXING PLATE VALVE 25 43T00452 UPPER CABINET
9 43T46332 VALVE;PACKED 6.35 DIA 26 43T96305 BUSHING

10 43T46019 VALVE,PACKED 12.7 DIA 27 43T62325 ELECTRIC PART COVER
11 43T47331 BONNET, 6.35 DIA 28 43T 61304 ELECTRIC PART BASE
12 43T47333 BONNET, 12.70 DIA 29 43T52302 MAGNETIC CONTACTOR;
13 43T47013 CAPILLARY TUBE; 2.0 DIA AC220-240V 50Hz
14 43T00449 FRONT CABINET 30 43T 55340 MF CAPACITOR (50uF 440V)
15 43T00473 LEFT CABINET 31 43T55324 CAPACITOR; PLASTIC-FILM
16 43T00451 RIGHT CABINET ASSEMBLY 32 43T 60387 TERMINAL BLOCK;5P
17 43T21345 FAN-MOTOR(Made in China) 33 43T33002 SPARK-KILLER
18 43T20319 PROPELLER FAN 34 43T 61305 MAGNETIC RELAY BASE
19 43T47001 NUT FLANGE 35 43T19331 FIN GUARD

20 43T19329 FAN GUARD

Description Description

− 70 −

11-4. Outdoor Unit (RAS-24S2AX, RAS-24S2A-E)

FILE NO. SVM-08032

Location Part Location Part

No. No. No. No.

1 43T42324 BASE PLATE ASSEMBLY 20 43T19329 FAN GUARD
2 43T41370 COMPRESSOR(Made in China) 21 43T04302 PARTITION
3 43T49011 SPRING BASE(UPPER) 22 43T39317 MOTOR BASE CONNECTION PLATE
4 43T49336 SPRING BASE (LOWER) 23 43T39318 MOTOR BASE
5 43T49019 SPRING; BUFFER 24 43T19330 PACKED VALVE COVER
7 43T43370 CONDENSER ASSEMBLY 25 43T00455 UPPER CABINET
8 43T00448 FIXING PLATE VALVE 26 43T96305 BUSHING

9 43T46332 VALVE;PACKED 6.35 DIA 27 43T62325 ELECTRIC PART COVER
10 43T46338 VALVE,PACKED 15.88 DIA 28 43T61306 ELECTRIC PARTS BASE
11 43T47331 BONNET, 6.35 DIA 29 43T52305 MAGNETIC CONTACTOR
12 43T47334 BONNET; 15.88 DIA. 30 43T55340 MF CAPACITOR (50uF 440V)
13 43T47013 CAPILLARY TUBE; 2.0 DIA 31 43T55341 CAPACITOR;PLASTIC-FILM
14 43T00449 FRONT CABINET 32 43T60387 TERMINAL BLOCK;5P
15 43T00474 LEFT CABINET 33 43T33002 SPARK-KILLER
16 43T00454 RIGHT CABINET 35 43T19331 FIN GUARD
17 43T21377 FAN MOTOR;AC220-240V 50Hz 36 43T00456 UPPER FRONT CABINET; A
18 43T20319 PROPELLER FAN 37 43T00457 UPPER FRONT CABINET; B
19 43T47001 NUT FLANGE 38 43T71301 HANDLE

Description Description

− 71 −

FILE NO. SVM-03010(1)

TOSHIBA CARRIER (THAILAND) CO.,LTD.

144/9 MOO 5, BANGKADI INDUSTRIAL PARK, TIVANON ROAD, TAMBOL BANGKADI,

AMPHUR MUANG, PATHUMTHANI 12000, THAILAND.

– 87 –