Toshiba RAS-24UAH-ES-1, RAS-24UKP-ES-1, RAS-18UA-ES2, RAS-18UKHP-ES2, RAS-18UAH-ES2 SERVICE MANUAL

SERVICE MANUAL

AIR CONDITIONER

RAS-24UKHP-ES-1 / RAS-24UAH-ES-1

RAS-18UKHP-ES2 / RAS-18UAH-ES2

FILE NO. SVM-03009

SPLIT WALL TYPE

RAS-24UKP-ES-1 / RAS-24UA-ES-1

RAS-18UKP-ES2 / RAS-18UA-ES2

18 Class

(Heat pump model)

24 Class18 Class

(Cooling only model)

Feb ., 2003

CONTENTS

1. SPECIFICATIONS

2. CONSTRUCTION VIEWS

2-1 Indoor Unit
2-2 Outdoor Unit (RAS-24UAH-ES-1, RAS24UA-ES-1)
2-3 Outdoor Unit (RAS-18UAH-ES2)
2-4 Outdoor Unit (RAS-18UA-ES2)

3. WIRING DIAGRAM

3-1 RAS-24UKHP-ES-1 / RAS-24UAH-ES-1
3-2 RAS-18UKHP-ES2 / RAS-18UAH-ES2
3-3 RAS-24UKP-ES-1 / RAS-24UA-ES-1
3-4 RAS-18UKP-ES2 / RAS-18UA-ES2

4. SPECIFICATION OF ELECTRICAL PARTS

4-1 Indoor Unit (RAS-24UKHP-ES-1, RAS-18UKHP-ES2)
4-2 Outdoor Unit (RAS-24UAH-ES-1)
4-3 Outdoor Unit (RAS-18UAH-ES2)
4-4 Indoor Unit (RAS-24UKP-ES-1, RAS-18UKP-ES2)
4-5 Outdoor Unit (RAS-24UA-ES-1)
4-6 Outdoor Unit (RAS-18UA-ES2)

FILE NO. SVM-03009

5. REFRIGERATION CYCLE DIAGRAM

5-1 RAS-24UKHP-ES-1 / RAS-24UAH-ES-1
5-2 RAS-18UKHP-ES2 / RAS-18UAH-ES2
5-3 RAS-24UKP-ES-1 / RAS-24UA-ES-1
5-4 RAS-18UKP-ES2 / RAS-18UA-ES2

6. CONTROL BLOCK DIAGRAM

6-1 RAS-24UKHP-ES-1, RAS-18UKHP-ES2
6-2 RAS-24UKP-ES-1, RAS-18UKP-ES2

7. OPERATION DESCRIPTION

7-1 Outline of Air Conditioner Control
7-2 Description of Operation Circuit
7-3 Hi POWER Mode
7-4 High-Temperature Limit Control
7-5 Low-Temperature Limit Control
7-6 Defrosting Operation
7-7 Auto Restart Function
7-8 Filter Check Lamp

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 Others

– 1 –

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

10. PARTS REPLACEMENT

10-1 Indoor Unit
10-2 Outdoor Unit (RAS-24UAH-ES-1, RAS-24UA-ES-1)
10-3 Outdoor Unit (RAS-18UAH-ES2)
10-4 Outdoor Unit (RAS-18UA-ES2)

11. EXPLODED VIEWS AND PARTS LIST

11-1 Indoor Unit (E - Parts Assy)
11-2 Indoor Unit
11-3 Outdoor Unit (RAS-24UAH-ES-1)
11-4 Outdoor Unit (RAS-18UAH-ES2)
11-5 Outdoor Unit (RAS-24UA-ES-1)
11-6 Outdoor Unit (RAS-18UA-ES2)

FILE NO. SVM-03009

• This air conditioner is charged with
HFC (R410A) that doesn’t deplete the
Ozone layer.

• This air conditioner requires special
installation for the refrigerant R410A.

– 2 –

1. SPECIFICATIONS

FILE NO. SVM-03009

MODEL

ITEM Cooling Heating Cooling Cooling Heating Cooling

Capacity

Phase 1∅

Power source V 220 – 240

Power consumption kW 2430 2510 2355 2435 2360 2440 1850 1900 1648 1718 1820 1870
Power factor % 96 92 95 90 96 92 98 97 94 92 98 97

Running current A 0.3/ 0.3/

Indoor/Outdoor 11.2 11.1 8.4 8.0 7.9 7.7
Starting current A 54 47
Moisture removal lit/h 2.5 2.7 2.0 2.0

Noise

Refrigerant

Refrigerant control Capillary tube

Interconnection Connection type Flare connection
pipe Maximum length

INDOOR UNIT RAS-24UKHP-ES-1 RAS-24UKP-ES-1 RAS-18UKHP-ES2 RAS-18UKP-ES2

Dimensions Width mm 998

Net weight kg 12
Evaporator type Finned tube
Indoor fan type Cross flow fan

Air volume Medium fan m3/h 750 800 750 650 700 650

Fan motor output W 20
Air filter Honeycomb woven filter with PP frame

OUTDOOR UNIT RAS-24UAH-ES-1 RAS-24UA-ES-1 RAS-18UAH-ES2 RAS-18UA-ES2

Dimensions Width mm 880 830 780

Net weight kg 65 62 50 48
Condenser type Finned tube
Outdoor fan type Propeller fan
Airflow volume m3/h 3400 3600 3400 3600 3400 3600 1800 2000 1800 2000 1800 2000
Fan motor output W 65 42

Compressor

Safety device IOL, Td Sensor IOL IOL, Td Sensor IOL
Louver type Automatic louver
Usable outdoor temperature range °C 15 ~ 43 –10 ~ 24 15 ~ 43 15 ~ 43 –10 ~ 24 15 ~ 43

Indoor (H/M/L) dB 45/41/37 42/39/35
Outdoor (220-240V) dB 56-57 57-58 56-57 51-52 52-53 51-52
Name of refrigerant R410A
Rated amount kg 1.6 1.3 1.2

Gas side size mm ∅12.7
Connection type Flare connection
Liquid side size mm ∅6.35

(One way) 25*
Maximum height

difference

Height mm 298

Depth mm 208

High fan m3/h 950 950 950 750 800 750

Low fan m3/h 600 650 600 530 570 530

Height mm 690 538

Depth mm 310 300

Model PA290X3F-4MS PA225X3F-4L
Output W 2200 1500

RAS-24UKHP-ES-1 RAS-24UKP-ES-1 RAS-18UKHP-ES2 RAS-18UKP-ES2

RAS-24UAH-ES-1 RAS-24UA-ES-1 RAS-18UAH-ES2 RAS-18UA-ES2

220V 240V 220V 240V 220V 240V 220V 240V 220V 240V 220V 240V

kW 6.30 6.30 6.80 6.90 6.40 6.45 5.00 5.05 5.45 5.55 5.05 5.10

Hz 50

220V 240V 220V 240V 220V 240V 220V 240V 220V 240V 220V 240V

0.3/11.2 0.3/10.9 0.3/10.8

m

m10 8

2

0.2/ 0.2/ 0.2/ 0.2/

1

15*

0.2/8.2 0.2/7.8

2

20*

– 3 –

Note : 1

• Capacity is based on the following temperature conditions.

FILE NO. SVM-03009

Condition

Temperature

Indoor unit inlet air temperature

Outdoor unit inlet air temperature

Note : 2

• Charge refrigerant according to the table below.

Refrigerant

*1 No need to charge

extra refrigerant

*2 Need to charge

extra refrigerant

RAS-24UKHP-ES-1 / RAS-24UAH-ES-1 RAS-18UKHP-ES2 / RAS-18UAH-ES2

RAS-24UKP-ES-1 / RAS-24UA-ES-1 RAS-18UKP-ES2 / RAS-18UA-ES2

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

(DB) 27°C 20°C

(WB) 19°C 15°C

(DB) 35°C 7°C

(WB) 24°C 6°C

15m or less 15m or less

JIS C9612-1994

Cooling Heating

– 4 –

2-1. Indoor Unit

Back body

Front panel

Grille inlet

298

2. CONSTRUCTION VIEWS

998

FILE NO. SVM-03009

208

75
7

51

Knock out system

Outline of indoor unit

Connection pipe (0.39m)
(Flare ∅12.7)

55 or more

Minimum distance

to ceiling

298

20

48

998

763.5
450

Drain hose (0.54m)

Connection pipe (0.49m)
(Flare ∅6.35)

20

10

75

50

56

(For stud bolt ∅6)

29

75

50

Knock out system

57

Wireless remote control

41

48

55
5555

18

8

160

∅65

100

Installation
Plate outline

– 5 –

100

∅

65

40

2-2.Outdoor Unit (RAS-24UAH-ES-1, RAS-24UA-ES-1)

anchor bolt

4-∅12X18

for ∅8 ∅10

FILE NO. SVM-03009

600 or

more

600

more

52

Air inlet

340

68

Installation dimension

100 or

∅25 Drain outlet

120

600 or

more

Air outlet

100 or

more

140

600

310

23

Electric

Parts cover

Liquid side

Handle

(Flare ∅6.35)

Gas side

(Flare ∅12.7)

Service Port

12

364

340 (pitch)

12

88

74

880

A

600

A Detail Drawing

50

63.8
340

27

690

Handle

∅12x18 hole

340

– 6 –

2-3.Outdoor Unit (RAS-18UAH-ES2)

anchor bolt

4x∅11x14

for ∅8-∅10

600 or more

600

600 or

Air inlet

more

Liquid side

Electric

Parts cover

(Flare ∅6.35)

Gas side

(Flare ∅12.7)

FILE NO. SVM-03009

Installation dimension

120

Air inlet

325

100 or more

Air

outlet

100 or more

8-∅6 holes

(for fixing outdoor unit)

or ∅8 — ∅10 anchor bolt)

6-∅11x14 holes

∅25 Drain outlet

Service Port

344

91 54

60

50

90

600

830

A

R10

600

50

35

A Detail Drawing

52

325

23

∅6 hole

∅11x14 hole

Fan guard

Handle

∅420

90

538

300

– 7 –

2-4.Outdoor Unit (RAS-18UA-ES2)

4x∅11x14

or ∅8-∅10

anchor bolt

600 or more

600

more

Air inlet

600 or

FILE NO. SVM-03009

Installation dimension

120

Air inlet

325

100 or more

100 or more

Air

outlet

Electric parts cover

8-∅6 hole

(for fixing outdoor unit)

4-∅11x14 hole

(for ∅8-∅10 anchor bolt)

Gas side

Liquid side

(Flare ∅6.35)

27

(Flare ∅12.7)

Service

Port

130

100

9090

600

344

65.5

780

A

600

Detail Drawing

A

50

R10

35

52.5
325

23

∅6 hole

301

325

∅11x14 hole

∅25Drain outlet

∅420

Fan guard

538

300

Handle

– 8 –

3. WIRING DIAGRAM

3-1.RAS-24UKHP-ES-1 / RAS-24UAH-ES-1

COLOR IDENTIFICATION

:

BROWN

BRW

:

RED

RED

:

WHI

WHITE

:

YEL

YELLOW

:

BLU

BLUE

:

BLK

BLACK

:

GRY

GRAY

:

PINK

PNK

:

ORANGE

ORN

GRN&YEL

:

GREEN &

GRN

:

GREEN

SG01
DSA

R22

VARISTOR

T6. 3A 250V

F01 FUSE

BLK
WHI
RED

GRN&YEL

CN31
CN30

CN23

BLK
P04

YELLOW

R09

R21

LOUVER
MOTOR

BLU

6
6

IC04

L01

R01

DB01

C15

C01

MAIN P.C. BOARD

(MCC-821)

CN13

3

4

1

2

5

6

7 8 9 10

3

4

1

2

5

6

7 8 9 10

BLU

BLU

BLU

BLU

BLU

BLU

BLU

BLU

5
5

6

7 8 9 10

6

7 8 9 10

BLU

3

4

1

2

3

4

1

2

INFRARED RAYS RECEIVE
AND INDICATION PARTS

ORN

PNK

YEL

RED

4

3

5

2

4

3

5

2

CN 07

CN03 CN01

WHI

CN25

FILE NO. SVM-03009

FAN MOTOR

DC MOTOR

BRW

4

3

6

5

1
1

BLK

1
1

C02

2
2

BLK

6

IC

IC01

THERMO
SENSOR

(TA)

5

CN 10

C06

4

T01

3

1
1

BLK

1
1

IC02

2
2

BLK

EXCHANGER

SENSOR

DC15V
DC0V

DC12V
DC7V

DC0V

HEAT

(TC)

OUTDOOR
TERMINAL
BLOCK

C

SR

COMPRESSOR TERMINAL

POWER SUPPLY
220-240 V~ 50 Hz

L

BLK

RED

BLK

RED

WHI
PNK

COMPRESSOR

INDOOR
TERMINAL
BLOCK

N

FERRITE CORE

RED

MAGNETIC

CONTACTOR

R

(1/L1)

(3/L2)

(2/T1)

(4/T2)

U

CAPACITOR

S

R

2

A1

A2

3

2

3

RED

WHI
RED

GRN&YEL

i

CHASSIS

CAPACITOR

FAN MOTOR

INDOOR
UNIT

OUTDOOR
UNIT

BLK BLK

TRANSFORMER

COIL FOR
4 WAY VALVE

BLK
BLK

RED
RED

BLK
BLK
WHI
RED
GRY

BLU

YEL

BLU

BLU

1
3

1
3

1
3
5
7
9

1
313

11
33

1
2
3

1
3

1
3
5
7
9

CN06

CN05

CN01

CN11

CN02

MAIN P.C. BOARD (MCC-890)

TNR

SG01

R74

F01

250VAC T6. 3A

CR11

CR12

CR13

CN03

1
1

RY07

RY05

3

TNR
R73

RY06

CN07

CN08

DISCHARGE
PIPE
SENSOR (TD)

BLU

1

1
2
3

3

BLU

BLK

1

1
2
3

3

BLK

HEAT
EXCHANGER
SENSOR (TE)

1

1

i

GRN&YEL

S

T

(5/L3)

52C

(6/T3)

V

W

C

BLK

– 9 –

3-2.RAS-18UKHP-ES2 / RAS-18UAH-ES2

COLOR IDENTIFICATION

:

BRW

BROWN

RED

:

RED

WHI

:

WHITE

YEL

:

YELLOW

BLU

:

BLUE

BLK

:

BLACK

GRY

:

GRAY

:

PNK

PINK

ORN

:

GRN

R22

VARISTOR

T6.3A 250V

F01 FUSE

ORANGE

:

GREEN &

:

GREEN

BLK
WHI
RED

GRN&YEL

BLK
P04

CN30
CN31

CN23

GRN&YEL

SG01
DSA

YELLOW

R09

R21

LOUVER
MOTOR

BLU

6
6

IC04

L01

R01

DB01

C15

C01

MAIN P.C. BOARD

(MCC-821)

CN13

3

4

1

2

5

6

7 8 9

3

4

1

2

5

6

7 8 9

BLU

BLU

BLU

BLU

BLU

BLU

BLU

BLU

3

4

1

2

3

4

1

2

INFRARED RAYS RECEIVE
AND INDICATION PARTS

BLU

5

6

7 8 9

5

6

7 8 9

ORN

PNK

YEL

RED

4

3

5

2

4

3

5

2

CN 07

CN03 CN01

10
10

WHI

10

CN25

10

FILE NO. SVM-03009

FAN MOTOR

DC MOTOR

BRW

4

3

6

5

1
1

BLK

1
1

+

C02

2
2

BLK

6

IC

IC01

THERMO
SENSOR

(TA)

5

CN 10

C06

4

T01

3

1
1

BLK

2
2

BLK

1
1

DC15V
DC0V

DC12V
DC7V

DC0V

IC02

HEAT

EXCHANGER

SENSOR

(TC)

OUTDOOR
TERMINAL
BLOCK

C

SR

COMPRESSOR TERMINAL

POWER SUPPLY
220-240 V~ 50 Hz

L

BLK

RED

BLK

CAPACITOR

RED

S

WHI
PNK

R

COMPRESSOR

INDOOR
TERMINAL
BLOCK

i

N

FERRITE CORE

RED

RELAY

C

BLK

11

12

1

1

GRN&YEL

13

14

2

2

RED

WHI
RED

15

16

3

3

i

CHASSIS

A

B

CAPACITOR

FAN MOTOR

INDOOR
UNIT

OUTDOOR
UNIT

GRN&YEL

BLK BLK

TRANSFORMER

COIL FOR
4WAY VALVE

BLK
BLK

RED
RED

BLK
BLK
WHI
RED
GRY

BLU

YEL

BLU

BLU

1

1
2

CN06

3

3

1

1

CN05

3

3

1

1

3

3

5

5

CN01

7

7

9

9

1

CN11

313

1

CN02

313

MAIN P.C. BOARD (MCC-890)

TNR

SG01

R74

F01

250VAC T6. 3A

CR11

CR12

CR13

CN03

1
1

RY07

RY05

3

TNR
R73

RY06

CN07

CN08

DISCHARGE
PIPE
SENSOR (TD)

BLU

1

1
2
3

3

BLU

BLK

1

1
2
3

3

BLK

HEAT
EXCHANGER
SENSOR (TE)

– 10 –

3-3.RAS-24UKP-ES-1 / RAS-24UA-ES-1

COLOR IDENTIFICATION

BRW

RED

WHI
YEL
BLU

BLK
GRY
PNK

ORN

GRN&YEL

R22

VARISTOR

SG01
DSA

T6.3A 250V

F01 FUSE

3

BLK
WHI
RED

GRN&YEL

CN27

BLK
P04

CN30
CN31

11

:

BROWN
RED

:

WHITE

:

YELLOW

:

BLUE

:

BLACK

:

GRAY

:

PINK

:

ORANGE

:

GREEN &

:
:

GREENGRN

RY04

YELLOW

R09

R21

LOUVER
MOTOR

BLU

6
6

IC04

L01

R01

DB01

C15

C01

MAIN P.C. BOARD

(MCC-821)

CN13

3

4

1

2

5

6

7 8 9

3

4

1

2

5

6

7 8 9

BLU

BLU

BLU

BLU

BLU

BLU

BLU

BLU

3

4

1

2

3

4

1

2

INFRARED RAYS RECEIVE
AND INDICATION PARTS

BLU

5

6

7 8 9

5

6

7 8 9

FILE NO. SVM-03009

FAN MOTOR

DC MOTOR

ORN

PNK

YEL

RED

BRW

1
1

C02

2
2

BLK

6

5

6

5

CN 10

C06

IC

IC01

THERMO
SENSOR

(TA)

4
4

T01

3
3

1
1

BLK

1
1

IC02

2
2

BLK

EXCHANGER

SENSOR

4

3

5

2

4

3

5

2

CN 07

CN03 CN01

10
10

WHI

10

CN25

10

1
1

BLK

DC15V
DC0V

DC12V
DC7V

DC0V

HEAT

(TC)

OUTDOOR
TERMINAL
BLOCK

INDOOR
TERMINAL
BLOCK

POWER SUPPLY
220-240 V~ 50 Hz

L

N

BLK

RED

BLK

RED

BLK BLK

SPARK KILLER

RED

MAGNETIC CONTACTOR

i

A1 A2

52C

1/L1 2/T1

3/L2 4/T2

5/L3 6/T3

1

1

2

2

GRN&YEL

RED

CAPACITOR

3

3

CHASSIS

ORN

THERMOSTAT

ORN

i

WHI

PNK

RED

CAPACITOR

S

R

COMPRESSOR

INDOOR
UNIT

OUTDOOR
UNIT

C

WHI
RED

FAN MOTOR

BLK

C

SR

COMPRESSOR TERMINAL

BLK

– 11 –

3-4.RAS-18UKP-ES2 / RAS-18UA-ES2

COLOR IDENTIFICATION

BRW

ORN

GRN&YEL

R22

VARISTOR

SG01
DSA

T6.3A 250V

F01 FUSE

3

BLK
WHI
RED

GRN&YEL

CN30

CN31

CN27

BLK
P04

11

RED

WHI
YEL
BLU

BLK
GRY
PNK

:

BROWN

:

RED

:

WHITE

:

YELLOW

:

BLUE

:

BLACK

:

GRAY

:

PINK

:

ORANGE
GREEN &

:

GREENGRN

YELLOW

RY04

R09

R21

LOUVER
MOTOR

BLU

6
6

IC04

L01

R01

DB01

C15

C01

MAIN P.C. BOARD

(MCC-821)

CN13

3

4

1

2

5

6

7 8 9

3

4

1

2

5

6

7 8 9

BLU

BLU

BLU

BLU

BLU

BLU

BLU

BLU

3

4

1

2

3

4

1

2

INFRARED RAYS RECEIVE
AND INDICATION PARTS

BLU

5

6

7 8 9

5

6

7 8 9

PNK

YEL

RED

ORN

4

3

5

2

4

3

5

2

CN 07

CN03 CN01

1

10

1

10

WHI

BLK

10

CN25

10

FILE NO. SVM-03009

FAN MOTOR

DC MOTOR

BRW

4

3

6

5

1
1

+

C02

2
2

BLK

6

IC

IC01

THERMO
SENSOR

(TA)

5

CN 10

C06

4

T01

3

1
1

BLK

2
2

BLK

1
1

DC15V
DC0V

DC12V
DC7V

DC0V

IC02

HEAT

EXCHANGER

SENSOR

(TC)

OUTDOOR
TERMINAL
BLOCK

CAPACITOR

RED

WHI

PNK

COMPRESSOR

COMPRESSOR TERMINAL

POWER SUPPLY
220-240 V~ 50 Hz

L

BLK

RED

BLK

RELAY

S

C

R

C

SR

INDOOR
TERMINAL
BLOCK

N

RED

BLK

11

121314

BLK

i

1

1

GRN&YEL

2

2

RED

15

16

3

3

BLK

BLK

CHASSIS

SPARK KILLER

A

B

CAPACITOR

RED

WHI

RED

FAN MOTOR

GRN&YEL

i

INDOOR
UNIT

OUTDOOR
UNIT

ORN

THERMOSTAT

ORN

BLK

– 12 –

FILE NO. SVM-03009

4. SPECIFICATION OF ELECTRICAL PARTS

4-1. Indoor Unit (RAS-24UKHP-ES-1, RAS-18UKHP-ES2)

No. Parts name Type Specifications

1 Fan motor (for indoor) ICF-340-30-F2 DC 340V, 30W
2 Thermo sensor (TA-sensor) ——— 10kΩ at 25°C
3 DC-DC transformer (T01) SWT-58A DC 390V, Secondary DC 15V, 12V, 7V
4 Microcontroller TMP87CM40AN
5 Heat exchanger sensor

(TC-sensor)
6 Line filter (L01) SS11V-R07190 19mH, AC 0.7A
7 Diode (DB01) D3SBA60 4A, 600V
8 Capacitor (C02) KMH450VNSN120M25C 120µF, 450V
9 Fuse (F01) TSCR T6.3A, 250V

10 Power supply IC (IC01) MA8920 5A, 900V
11 Varistor (R21, R22) 15G561K 560V
12 Resistor (R01) RF-5TK4R7 4.7Ω, 5W
13 Louver motor MP35EA12 Output (Rated) 2W, 10poles, 1phase,

——— 10kΩ at 25°C

DC 12V

4-2. Outdoor Unit (RAS-24UAH-ES-1)

No. Parts name Type Specifications

Output (Rated) 2200W, 2poles, 1 phase, 220 – 240V, 50Hz

1 Compressor PA290X3F-4MS Winding resistance (Ω) Red-Black White-Black

(at 20°C) 1.07 2.20
Output (Rated) 65W, 6poles, 1 phase, 220 – 240V, 50Hz

2 Fan motor (for outdoor) KFG6-71SB5P-T1 Winding resistance (Ω) Red-Black White-Black

(at 20°C) 64.4 127.4

Running capacitor

3

(for fan motor)

Running capacitor

4

(for compressor)

Solenoid coil

5

(for 4-way valve)
6 Thermo sensor TE / TD 10kΩ at 25°C / 50kΩ at 25°C
7 Magnetic contactor A35 220 – 240V, 50Hz
8 Transformer TT-05 220 – 240V
9 Microcontroller TMP47C840N

10 Varistor (R73, R74) 15G471K 470V
11 Fuse (F01) MT3 T6.3A, 250V

451355KQ AC 450V, 3.5µF

371456JCR AC 370V, 45µF

VHV (STF) AC 220 – 240V

– 13 –

FILE NO. SVM-03009

4-3. Outdoor Unit (RAS-18UAH-ES2)

No. Parts name Type Specifications

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

1 Compressor PA225X3F-4L Winding resistance (Ω) Red-Black White-Black

(at 20°C) 1.35 2.68
Output (Rated) 65W, 6poles, 1 phase, 220 – 240V, 50Hz

2 Fan motor (for outdoor) HF-240-42B-2 Winding resistance (Ω) Red-Black White-Black

(at 20°C) 176.2 290.5

Running capacitor

3

(for fan motor)

Running capacitor

4

(for compressor)

Solenoid coil

5

(for 4-way valve)
6 Thermo sensor TE / TD 10kΩ at 25°C / 50kΩ at 25°C
7 Relay VC20FA 220 – 240V, 50Hz, 1P1a
8 Transformer TT-05 220 – 240V
9 Microcomputer TMP47C840N

10 Varistor (R73, R74) 15G471K 470V
11 Fuse (F01) MT3 T6.3A, 250V

451205KQ AC 450V, 2µF

371456JCR AC 370V, 45µF

VHV (STF) AC 220 – 240V

4-4. Indoor Unit (RAS-24UKP-ES-1, RAS-18UKP-ES2)

No. Parts name Type Specifications

1 Fan motor (for indoor) ICF-340-30-2 DC 340V, 30W
2 Thermo sensor (TA-sensor) ——— 10kΩ at 25°C
3 DC-DC transformer (T01) SWT-58A DC 390V, Secondary DC 15V, 12V, 7V
4 Microcontroller TMP87CM40AN
5 Heat exchanger sensor

(TC-sensor)
6 Line filter (L01) SS11V-R07190 19mH, AC 0.7A
7 Diode (DB01) D3SBA60 4A, 600V
8 Capacitor (C02) KMH450VNSN120M25S 120µF, 450V
9 Fuse (F01) TSCR T6.3A, 250V

10 Relay (for outdoor fan motor,

solenoid coil) (RY04)

11 Power supply IC (IC01) MA8920 5A, 900V
12 Varistor (R21, R22) 15G561K 560V
13 Resistor (R01) RF-5TK4R7 4.7Ω, 5W
14 Louver motor MP35EA12 Output (Rated) 2W,10poles, 1phase,

——— 10kΩ at 25°C

AJQ1341 Coil DC 12V, 33mA, Rated 1A, AC 250V

DC 12V

– 14 –

FILE NO. SVM-03009

4-5. Outdoor Unit (RAS-24UA-ES-1)

No. Parts name Type Specifications

Output (Rated) 2200W, 2poles, 1 phase, 220 – 240V, 50Hz

1 Compressor PA290X3F-4MS Winding resistance (Ω) Red-Black White-Black

(at 20°C) 1.07 2.20
Output (Rated) 65W, 6poles, 1 phase, 220 – 240V, 50Hz

2 Fan motor (for outdoor) KFG6-71SB5P-T Winding resistance (Ω) Red-Black White-Black

(at 20°C) 64.4 127.4

Running capacitor

3

(for fan motor)

Running capacitor

4

(for compressor)
5 Bimetal thermostat CS-7C Open 130 ± 5°C, Close 70 ± 10°C
6 Magnetic contactor A35 220 – 240V, 50Hz

451355KQ AC 450V, 3.5µF

371456JCR AC 370V, 45µF

4-6. Outdoor Unit (RAS-18UA-ES2)

No. Parts name Type Specifications

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

1 Compressor PA225X3F-4L Winding resistance (Ω) Red-Black White-Black

(at 20°C) 1.35 2.68
Output (Rated) 42W, 6poles, 1 phase, 220 – 240V, 50Hz

2 Fan motor (for outdoor) HF-240-42B Winding resistance (Ω) Red-Black White-Black

(at 20°C) 176.2 290.5

Running capacitor

3

(for fan motor)

Running capacitor

4

(for compressor)
5 Bimetal thermostat CS-7C Open 130 ± 5°C, Close 70 ± 10°C
6 Relay VC20FA 220 – 240V, 50Hz, 1P1a

451205KQ AC 450V, 2µF

371456JCR AC 370V, 45µF

– 15 –

5. REFRIGERATION CYCLE DIAGRAM

5-1.RAS-24UKHP-ES-1 / RAS-24UAH-ES-1

FILE NO. SVM-03009

Indoor unit

Cooling

0.49m
(Connecting pipe)
∅12.7

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

Cooling

Heating

Tank

Heating

P

Packed valve

(∅12.7)
Gas container connection (Reinstall etc.)

Heating

4-way valve

Cooling

Compressor

PA290X3F-4MS

Heat exchanger

Cross flow fan

T1

0.39m
(Connecting pipe)
∅6.35

Packed valve

(∅6.35)

Capillary tube

∅2.0x700s

Condenser

Refrigerant
R410A 1.6 kg

Cooling
Heating

Propeller fan

Outdoor unit

Mark( )means check points of Gas Leak.

Ambient temp.

Surface temp. of heat

exchanger interchanging

pipe

T1

(°C)

Fan speed

(indoor)

conditions DB/WB

(°C)

Indoor Outdoor

50Hz

Standard

pressure

(MPaG)

P

Standard 2.7 43.0 High 20/– 7/6

Heating Overload*1 3.1 ~ 4.0 52.0 ~ 59.0 Low 27/– 24/18

Low temperature 2.7 36.0 High 20/– –10/–10
Standard 0.9 11.0 High 27/19 35/24

Cooling Overload 0.8 12.0 High 32/23 43/26

Low temperature 0.5 1.0 Low 21/15 21/15

Note :

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

*1 • During heating overload operation, a value for the high temperature limit control operation is included.

– 16 –

5-2.RAS-18UKHP-ES2 / RAS-18UAH-ES2

FILE NO. SVM-03009

Indoor unit

Cooling

0.39m
(Connecting pipe)

∅

12.7

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

Cooling

Heating

Heating

P

Packed valve

∅

(

Heating

4-way valve

Cooling

Compressor

12.7)

PA225X3F-4L

Accumulator

Condenser

Evaporator

Cross flow fan

T1

Capillary tube

∅1.7x700s

Packed valve

(

∅

6.35)

Capillary tube

∅1.0x1500s

0.49m
(Connecting pipe)

∅

6.35

Refrigerant
R410A 1.3 kg

Cooling
Heating

Propeller fan
Outdoor unit

Mark( )means check points of Gas Leak.

Ambient temp.

Surface temp. of heat

exchanger interchanging

pipe

T1

(°C)

Fan speed

(indoor)

conditions DB/WB

(°C)

Indoor Outdoor

50Hz

Standard

pressure

(MPaG)

P

Standard 2.7 45.0 High 20/– 7/6

Heating Overload*1 3.0 ~ 3.8 49.0 ~ 58.0 Low 27/– 24/18

Low temperature 2.0 34.0 High 20/––10/–10
Standard 0.9 10.0 High 27/19 35/24

Cooling Overload 1.0 15.0 High 32/23 43/26

Low temperature 0.6 1.0 Low 21/15 21/15

Note :

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

*1 • During heating overload operation, a value for the high temperature limit control operation is included.

– 17 –

5-3.RAS-24UKP-ES-1 / RAS-24UA-ES-1

FILE NO. SVM-03009

Indoor unit

Cooling

0.49m
(Connecting pipe)
∅12.7

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

Cooling

Tank

P

Packed valve

(∅12.7)
Gas container connection (Reinstall etc.)

Cooling

Compressor

PA290X3F-4MS

Heat exchanger

Cross flow fan

T1

Packed valve

∅

6.35)

(

Capillary tube

∅2.0x600s

0.39m
(Connecting pipe)

∅

6.35

Condenser

Refrigerant
R410A 1.6kg

Cooling

Propeller fan
Outdoor unit

Mark( )means check points of Gas Leak.

Ambient temp.

Surface temp. of heat

exchanger interchanging

pipe

T1

(°C)

Fan speed

(indoor)

conditions DB/WB

(°C)

Indoor Outdoor

50Hz

Standard

pressure

(MPaG)

P

Standard 0.9 11.0 High 27/19 35/24

Cooling Overload 0.8 12.0 High 32/23 43/26

Low temperature 0.5 1.0 Low 21/15 21/15

Note :

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

– 18 –

5-4.RAS-18UKP-ES2 / RAS-18UA-ES2

FILE NO. SVM-03009

Indoor unit

Cooling

0.39m
(Connecting pipe)

∅

12.7

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

Cooling

Packed valve

Cooling

P

∅

12.7)

(

Compressor

PA225X3F-4L

Accumulator

Evaporator

Cross flow fan

T1

Packed valve

(

∅

6.35)

Muffler

Capillary tube

∅1.7x350s

0.49m
(Connecting pipe)

∅

6.35

Condenser

Refrigerant
R410A 1.2 kg

Cooling

Propeller fan
Outdoor unit

Mark( )means check points of Gas Leak.

Ambient temp.

Surface temp. of heat

exchanger interchanging

pipe

T1

(°C)

Fan speed

(indoor)

conditions DB/WB

(°C)

Indoor Outdoor

50Hz

Standard

pressure

(MPaG)

P

Standard 0.9 10.0 High 27/19 35/24

Cooling Overload 1.0 13.0 High 32/23 43/26

Low temperature 0.6 2.0 Low 21/15 21/15

Note :

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

– 19 –

6. CONTROL BLOCK DIAGRAM

6-1.RAS-24UKHP-ES-1, RAS18UKHP-ES2

Indoor Unit Control Panel

Heat Exchanger Sensor

Functions

• Louver Control

FILE NO. SVM-03009

M.C.U.

Operation

Display

Temperature Sensor

Infrared Rays Signal Receiver

Infrared

Rays

Remote
Control

From Outdoor Unit

220 ~ 240V AC 50Hz

Initiallizing Circuit

Clock Frequency
Oscillator Circuit

Power Supply

Circuit

Noise Filter

• 3-minute Delay at Restart for Compressor

• Motor Revolution Control

• Processing

(Temperature Processing)

• Timer

• Serial Signal Communication

Louver ON/OFF Signal

Louver Driver

Serial Signal Transmitter/Receiver

Serial Signal Communication

Timer

Display

Filter Sign

Display

PRE DEF.

Sign Display

Hi Power

Sign Display

Indoor

Fan Motor

Louver Motor

REMOTE CONTROL

Infrared Rays

Remote Control

Operation (START/STOP)
Operation Mode Selection

AUTO, COOL, DRY, HEAT, FAN ONLY

Temperature Setting
Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

Louver Auto Swing

Louver Direction Setting

ECO

Hi power

Filter Reset

– 20 –

6-2.RAS-24UKP-ES-1, RAS18UKP-ES2

Indoor Unit Control Panel

Heat Exchanger Sensor

Functions

• Louver Control

FILE NO. SVM-03009

M.C.U.

Operation

Display

Temperature Sensor

Infrared Rays Signal Receiver

Infrared

Rays

Remote

Control

From Outdoor Unit

220 ~ 240V AC 50Hz

Initiallizing Circuit

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

Relay RY04

Outdoor Unit

Louver ON/OFF Signal

Louver Driver

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 (START/STOP)

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

Filter Reset

– 21 –

7. OPERATION DESCRIPTION

FILE NO. SVM-03009

7-1.Outline of Air Conditioner Control

This is a fixed capacity type air conditioner, which uses
a DC motor for an indoor fan. The DC motor 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 controller.
The outdoor unit controller 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 setting 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

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

• Defrost control in heating operation
(Temperature measurement by the outdoor heat
exchanger and control for the four-way valve
and the outdoor fan motor) *Heat pump Model
only

Operations according
to the commands
from the indoor unit

7-1-1. 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 [FIX] button is pressed, it stops
swinging.

7-1-2. Indoor fan control (DC Fan motor)

(1) The indoor fan is operated by the stepless speed

change DC motor.

(2) For air flow level, speed of the indoor fan motor is

controlled in five steps (LOW, LOW+, MED, MED
and HIGH). If AUTO mode is selected, the fan
motor speed is automatically controlled by the
difference between the preset temperature and
the room temperature.

Table 7-1-1

RAS-24UKHP-ES-1 RAS-18UKHP-ES2

MODEL

Cooling HIGH 1350 950 1150 750

and MED 1150 750 1050 650

Fan only LOW 1000 600 900 530

Heating MED 1200 800 1100 700

MODEL RAS-24UKP-ES-1 RAS-18UKP-ES2

Cooling HIGH 1350 950 1150 750

and MED 1150 750 1050 650

Fan only LOW 1000 600 900 530

Motor speed Air flow level Motor speed Air flow level

(rpm) (m3/h) (rpm) (m3/h)

HIGH 1350 950 1200 800

LOW 1050 650 950 570

LOW+=

MED+=

LOW+MED

2

MED+HIGH

2

+

– 22 –

FILE NO. SVM-03009

7-2. Description of Operation Circuit

(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 [START / STOP] 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 thereafter simply by pressing
[START / STOP] button.

7-2-1. 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. 7-2-1. When
[FAN] button is set to LOW, LOW+, MED, MED+ or
HIGH, the motor operates with a constant air flow.

7-2-2. Cooling operation

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

(1) The compressor, 4-way valve, outdoor fan and

operation display lamp are controlled as shown in
Fig. 7-2-2.

ON ON

OFF ON OFF OFF ON

Compressor

4-way valve

Common relay

Preset
temp.

0.5

0

Fig. 7-2-2

Outdoor fan

display lamp

OPERATION

+3
+2.5
+2

+1.5
+1
+0.5

(Room temp.) — (Preset temp.)

Preset
temp.

0

(Preset temp.: 24°C)

NOTE :

*1: The values marked with *1 are calculated and

controlled by the difference in motor speed
between M+ and L–.

Fig. 7-2-1 Setting of air flow [FAN:AUTO]

(2) ECO operation cannot be set.

M+

*1
*1
*1

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

motor operates as shown in Fig. 7-2-3. When
[FAN] button is set to LOW, LOW+, MED, MED+ or
HIGH, the motor operates with a constant air flow.

(Room temp.) — (Preset temp.)

Preset
temp.

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

0

-0.5

M+

*1
*1
*1

NOTE :

*1: The values marked with *1 are calculated and

controlled by the difference in motor speed
between M+ and L–.

Fig. 7-2-3 Setting of air flow [FAN:AUTO]

– 23 –

FILE NO. SVM-03009

7-2-3. Dry operation

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

(1) The compressor, 4-way valve, outdoor fan and

operation display lamp are controlled as shown in
Fig. 7-2-4.

ON:6min.

OFF:4min.

ON

ON:5min.

OFF:5min.

OFF

Compressor

OFF

OFF

4-way valve

Common relay

Preset
temp.

+3

+2

+1

0

Fig. 7-2-4

ON:6min.

OFF:4min.

ON

ON:5min.

OFF:5min.

Outdoor fan

display lamp

OPERATION

7-2-4. Heating operation *Heat pump model only

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

(1) The compressor, 4-way valve, outdoor fan and

operation display lamp are controlled as shown in
Fig. 7-2-6.

Preset
temp.

ON

ON ON

OFF

ON

Compressor

OFF

ON

4-way valve

Common relay

Fig. 7-2-6

display lamp

Outdoor fan

OPERATION

(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. 7-2-5.

Room temp.

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. 7-2-5

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

only.

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

motor operates as shown in Fig. 7-2-7. When
[FAN] button is set to LOW, LOW+, MED, MED+ or
HIGH, the motor operates with a constant air flow.

Preset
temp.

0

-0.5

-1

-1.5

-2

-5.0

-5.5

[FAN AUTO]

L

*1
*2

+

M

H

*1, *2 : The values marked with *1 and *2 are

calculated and controlled by the difference in
motor speed between M+ and L.

Fig. 7-2-7 Setting of air flow [FAN:AUTO]

(4) The ECO and Hi Power operations can not be set.

– 24 –

FILE NO. SVM-03009

(3) The indoor heat exchanger restricts revolving

speed of the fan motor to prevent a cold draft. The
upper limit of the revolving speed is shown in
Fig. 7-2-8 and Table 7-2-1.

Manual
(One of

AUTO

*4

SUL*
SUL*1

Stop

5 steps)

L-H
(Up to
setting

3

speed)

*2

A+4 A+4

A-8 A-8

464534

33

33 21
32 20

*6 *5

NOTES :

*1: The fan stops for 2 minutes after thermostat-OFF.
*2: A is 24°C when the preset temperature is 24°C or

more and A is the preset temperature when it is

under 24°C.
*3: SUL means Super Ultra Low.
*4: Calculated from difference in motor speed

between SUL and HIGH.

7-2-5. Automatic operation

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

(1) One of 3 operations (Cooling, Fan only or Heating)

is selected according to difference between the
preset temperature and the room temperature at
which the automatic operation has started, as
shown in Fig. 7-2-9. The Fan only operation
continues until the room temperature reaches a
level at which another mode is selected.

(2) Temporary Auto

When the TEMPORARY 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. 7-2-9.

C

Cooling operation

The louver moves to the position same
as Hi POWER operation.

+4

Cooling operation

0

Fan only operation

Fig. 7-2-8 Cold draft preventing control

*5 and *6:

Table 7-2-1

Fan *5 *6
speed Starting period Stabilized period

AUTO • Up until 12 minutes

passed after starting
the unit

• From 12 to 25 minutes
passed after starting
the unit and room
temperature is 3°C
lower than preset
temperature

Manual • Room temperature
(L – H) < Preset temperature

• From 12 to 25 minutes
passed after starting
the unit and room
temperature is
between preset
temperature and 3°C
lower than preset
temperature

• 25 minutes or more
passed after starting
the unit

• Room temperature

Preset temperature

–4°C

–3.5°C

Heating operation

RAS-24UKHP-ES-1

(Room temp.) — (Preset temp.)

RAS-18UKHP-ES2

RAS-24UKP-ES-1
RAS-18UKP-ES2

Fig. 7-2-9

– 25 –

FILE NO. SVM-03009

60

55

52

Compressor

Outdoor fan

OFF

OFF

ON

ON

OFF

ON

Heat exchanger
temp.

7-3.Hi POWER Mode

([Hi POWER] button on the remote
control is pressed.)

When [Hi POWER] button is pressed while the indoor
unit is in Auto, Cooling or Heating 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 preset temperature drops 1°C.
(The value of the preset temperature on the
remote control does not change.)

• If the difference between the preset
temperature and the room temperature is big,
the horizontal louver moves to the Hi POWER
position automatically. Then when the difference
between them gets smaller, the horizontal
louver returns automatically.

• FAN speed : [AUTO]
If the difference between the preset
temperature and room temperature is big, the
air conditioner operates at maximum airflow
level. If the difference between the preset
temperature and the room temperature is small,
the air conditioner operates at normal airflow
level.

• FAN speed : One of 5 levels
The air conditioner operates at normal airflow
level.

7-4.High-Temperature Limit Control

*Heat pump model only

The microcontroller detects the indoor heat exchanger
temperature to prevent pressure of a refrigerating cycle
from increasing excessively.
The compressor and outdoor fan motor are controlled
as shown in Fig. 7-4-1.

Fig. 7-4-1

7-5.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. 7-5-1.

Heat exchanger
temperature

6

2

Compressor Outdoor fan

ON

Less than continues

for 5 minutes

OFF

(3) Heating operation *Heat pump model only

• The preset temperature increases 2°C,
(The value of the preset temperature on the
remote control does not change.)

• The indoor unit operates in normal heating
mode except the preset temperature is higher
(+2°C).

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

Fan only operation.

Fig. 7-5-1

7-6.Defrost Operation *Heat pump model only

When the indoor unit is in heating operation, if the
refrigerant evaporation temperature detected by the
outdoor heat exchanger sensor is under the specified
temperature, the outdoor unit starts the defrosting
operation. At this time, the 4-way valve relay and the
outdoor fan motor are turned off. The indoor fan motor
is also turned off by the cold draft preventing control of
the indoor microcomputer. Then, [PRE. DEF.] lamp on
the indoor unit comes on.
The defrosting operation stops and the 4-way valve
relay, outdoor fan motor and the indoor fan motor are
turned on automatically when the refrigerant
evaporation increases to the specified temperature, or
when the defrosting time is over 12 minutes.

– 26 –

FILE NO. SVM-03009

7-7.Auto Restart Function

The indoor unit is equipped with an automatic
restarting function which allows the unit to restart
operating with the set operating conditions in the event
of 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.

7-7-1. How to set 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.
Push the [TEMPORARY] button located in the center
of the front panel continuously for 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 on standby (Not operating)

Operation Motions

Push [TEMPORARY] button for more The unit is on standby.
than three seconds.

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

0

3S

The unit beeps three times The lamp changes from

→

→

and continues to operate. green to orange.

TEMPORARY button

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

After approx. three seconds,

When the unit is in operation

Operation Motions

Push [TEMPORARY] button for more The unit is in operation. The green lamp is on.
than three seconds.

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

→

→

After approx. three seconds,

0

3S

TEMPORARY button

• While this function is being set, if the unit is in
operation, the orange lamp is on.

• This function can not be set if the timer operation

The unit beeps three times.
If the unit is required to operate at this time, push [TEMPORARY]

button once more or use the remote control to turn it on.

• While the filter check lamp is on, the
TEMPORARY button has the function of filter
reset button.

has been selected.

• When the unit is turned on by this function, the
louver will not swing even though it was swinging
automatically before shutting down.

– 27 –

7-7-2. How to cancel auto restart function

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

When the unit is on standby (Not operating)

Operation Motions

Push [TEMPORARY] button for more The unit is on standby.
than three seconds.

→

FILE NO. SVM-03009

The unit starts to operate. The orange lamp is on.

→

After approx. three seconds,

0

3S

The unit beeps three times The lamp changes from
and continues to operate. orange to green.

TEMPORARY button

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

When the unit is in operation

Operation Motions

Push [TEMPORARY] button for more The unit is in operation. The orange lamp is on.
than three seconds.

The unit stops operating. The orange lamp is turned off.

→

→

After approx. three seconds,

0

3S

TEMPORARY button

• While this function is being set, if the unit is in

The unit beeps three times.
If the unit is required to operate at this time, push [TEMPORARY]

button once more or use the remote control to turn it on.

7-8. Filter Check Lamp

operation, the orange lamp is on.

When the elapsed time reaches 1000 hours, the filter

7-7-3. Power failure during timer operation

check lamp indicates. After cleaning the filters, turn off
the filter check lamp.

When the unit is in Timer operation, if it is turned off
because of power failure, the timer operation is

7-8-1. How to turn off filter check lamp

cancelled. Therefore, set the timer operation again.

Press [FILTER] button on the remote control.
OR push [TEMPORARY] b utton on the indoor unit.

Note:

If [TEMPORARY] button is pushed while the filter
check lamp is not indicating, the indoor unit will start
the Automatic Operation.

– 28 –

FILE NO. SVM-03009

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 AIR CONDITIONER USES THE NEW HFC REFRGERANT (R410A), WHICH DOES NOT DESTROY

THE OZONE LAYER.

R410A refrigerant is apt to be affected by impurity such as water, oxidizing membranes, and oils because the
pressure of R410A refrigerant is approx. 1.6 times of refrigerant R22. As well as the adoption of this new
refrigerant, refrigerating machine oil has also been changed. Therefore, during installation work, be sure that
water, dust, former refrigerant, or refrigerating machine oil does not enter into the refrigerating cycle of a
new-refrigerant air conditioner.
To avoid mixing refrigerant and refrigerating machine oil, the sizes of charging port connecting sections on
the main unit are different from those for the conventional refrigerant, and different size tools are also
required. Accordingly, special tools are required for the new refrigerant (R410A) as shown below. For
connecting pipes, use new and clean piping materials with high-pressure withstand capabilities, designed for
R410A only, and ensure that water or dust does not enter. Moreover, do not use any existing piping as its
pressure withstand may be insufficient, and may contain impurities.

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.

New Refrigerant Air conditioner Installation

To Disconnect the Appliance from the Main Power Supply.

– 29 –

FILE NO. SVM-03009

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 T O 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 (R410A) 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.

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.

Remark per EMC Directive 89/336/EEC

To prevent flicker impressions during the start of the compressor (technical process) following installation
conditions do apply.

1. The power connection for the air conditioner has to be done at the main power distribution. This distribution
has to be of an impedance.
Normally the required impedance is reached at a 32A fusing point. Air conditioner fuse has to be 16A max.!

2. No other equipment should be connected to this power line.

3. For detailed installation acceptance, please contact your power supplier whether its restriction does apply
for products like washing machines, air conditioners or electrical ovens.

4. For power details of the air conditioner, refer to the rating plate of the product.

– 30 –

8-2.Installation Diagram of Indoor and Outdoor Units

FILE NO. SVM-03009

(A

Before installing the
wireless remote control

• With the remote control cover
open, load the batteries supplied
correctly, observing their polarity.

2 Wireless remote control

ttac

h to th

e fr

on

7 Purifying filter

6 Zeolite filter

5 Filter frame

t panel) (A

170 mm

or more

Hook

A

ir filte

r

ttac

h to

the air filter)

9 Pan head wood screw

4 Remote control holder

Hook

65 mm or more

1 Installation

plate

170 mm

or more

Shield
pipe

For the rear left and left
piping

Wall

Insert the cushion between
the indoor unit and wall,
and lift 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 the left, rear
left, rear, right or bottom.

Cover

2 Wireless remote control

3 Batteries

Extension
drain hose
(Option:
RB–821SW)

ore

or m

m

100 m

r

e

600 mm or more

Electric
parts
cover

600 mm

or more

Cooling only

100 mm

or more

o

m

r

o

m

m

0

0

6

18 Class

Heat pump

Loop the connective cable
(about 100 mm in diameter and 300 – 350 mm long).

600 mm

or more

Vinyl tape Apply
after carrying out
a drainage test

Saddle

Extension
drain hose
(Option:
RB–821SW)

Electric
parts cover

600 mm

or more

100 mm

or more

0

6

100 mm or more

600 mm or more

e

r

o

m

r

o

m

m

0

24 Class18 Class

Loop the connective cable
(about 100 mm in diameter and 300 – 350 mm long).

Right

Rear

Bottom

Rear
left

Insulate the refrigerant
pipes separately with
insulation, not together.

6 mm thick heat resisting
polyethylene foam

Left

– 31 –

8-3.Installation

8-3-1. Optional installation parts

FILE NO. SVM-03009

Part

Code

Parts name

Refrigerant piping
Liquid side : ∅6.35 mm

A

Gas side : ∅12.7 mm
Pipe insulating material

B

(polyethylene foam, 6 mm thick)

C

Putty, PVC tapes

<Fixing bolt arrangement of outdoor unit>
RAS-24UKP-ES-1 / RAS-24UA-ES-1

600 mm

Air inlet

120 mm

64 mm

340 mm

Q'ty

One

each

1

One

each

Air outlet

Drain outlet

Fig. 8-3-1

RAS-18UAH-ES2 RAS-18UA-ES2

325 mm

52 mm

Air outlet

Air outlet

600 mm

Air inlet

120 mm

325 mm

52 mm

Air outlet

600 mm

Air inlet

120 mm

Air outlet

Fig. 8-3-2 Fig. 8-3-3

• 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.

• If it is necessary to drain the defrost water, attach drain nipple ! to the bottom plate of the outdoor unit

before installing it.

– 32 –

8-3-2. Accessory and installation parts

FILE NO. SVM-03009

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

Name

Part

No.

Part name (Q'ty)

4

Remote control holder x 1

5

Filter frame x 2

6

Zeolite filter x 2

Part

No.

Part name (Q'ty)

7

Purifying filter x 2

8

Mounting screw ∅4 x 25 s x 8

9

Pan head wood screw
∅3.1 x 16 s x 2

!

Installation manual

(For Heat pump model only)

This model is not equipped with an extension drain hose.

Drain nipple* x 1

The part marked with asterisk (*) is packaged with the
outdoor unit.

Option :

For the extension drain hose, use an optionally available RB-821SW or commercially available one.

– 33 –

FILE NO. SVM-03009

8-3-3. Installation/Servicing tools
<Changes in the product and components>

In the case of an air conditioner using R410A, in order to prevent any other refrigerant from being charged
accidentally, the service port diameter of the outdoor unit control valve (3 way valve) has been changed. (1/2
UNF 20 threads per inch)

• In order to increase the pressure
size of opposite side of flare nuts have been changed. (for copper pipes with nominal dimensions 1/2 and 5/8)

New tools for R410A

New tools for R410A Applicable to R22 model Changes

Gauge manifold As pressure is high, it is impossible to measure by

Charge hose In order to increase pressure withstand strength,

withstand

strength of the refrigerant piping, flare processing diameter and

means of conventional gauge. In order to prevent
any other refrigerant from being charged, each
port diameter has been changed.

hose materials and port size have been changed
(to 1/2 UNF 20 threads per inch).
When purchasing a charge hose, be sure to
confirm the port size.

Electronic balance As pressure is high and gasification speed is fast,
for refrigerant charging it is difficult to read the indicated value by means

of a charging cylinder, as air bubbles occur.

Torque wrench The size of opposing side of flare nuts have been
(nominal dia. 1/2, 5/8) increased.

Incidentally, a common wrench is used for nominal
diameters 1/4 and 3/8.

Flare tool By increasing the clamp bar’s receiving hole,
(clutch type) strength of spring in the tool has been improved.

Gauge for projection Used when flare is made by using conventional
flare adjustment tool.

V acuum pump adapter Connected to conventional vacuum pump. It is

Gas leakage detector Exclusive for HFC refrigerant.

—

necessary to use an adapter to prevent vacuum
pump oil from flowing back to the charge hose.
The charge hose connecting part has two ports­one for conventional refrigerant (7/16 UNF 20
threads per inch) and one for R410A. If the
vacuum pump oil (mineral) mixes with R410A,
a sludge may occur and damage the equipment.

• Incidentally, the “refrigerant cylinder” comes with the refrigerant designation (R410A) and protector coating in
the U. S’s ARI specified rose color (ARI color code: PMS 507).

• Also, the “charge port and packing for refrigerant cylinder” require 1/2 UNF 20 threads per inch
corresponding to the charge hose’s port size.

– 34 –

FILE NO. SVM-03009

8-4.Indoor Unit

8-4-1. Installation place

• A place which provides the spaces around the
indoor unit as shown in the above diagram.

• A place where there is no obstacle near the air inlet
and outlet.

• A place that allows easy installation of the piping to
the outdoor unit.

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

CAUTION

• Direct sunlight to the indoor unit’s wireless

receiver should be avoided.

• The microprocessor in the indoor unit should not

be too close to RF noise sources.
(For details, see the owner’s manual.)

<Remote control>

• A place where there are no obstacles such as a
curtain that may block the signal from the indoor
unit.

• Do not install the remote control in a place exposed
to direct sunlight or close to a heating source, such
as a stove.

• Keep the remote control at least 1 m apart from the
nearest TV set or stereo equipment. (This is
necessary to prevent image disturbances or noise
interference.)

• The location of the remote control should be
determined as shown below.

Remote
control

(Top view)

Indoor unit

Reception
range

* : Axial distance

45

°

5 m

°

Remote control

m

5

45

Indoor unit

(Side view)

7 m

°

5

7

Reception
range

8-4-2. Cutting a hole and mounting installation

plate

<Cutting a hole>

When installing the refrigerant pipes from the rear.

Pipe
hole

6

5

m

m

The center of the pipe
hole is above the arrow.

100 mm

Fig. 8-4-2

1. After determining the pipe hole position on the
mounting plate (A), drill the pipe hole (∅65 mm) at
a slight downward slant to the outdoor side.

NOTE

• When drilling 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>

For installation of the indoor unit, use the paper pattern
on the back.

Hook

* 7 m

170

120

55

65

Fig. 8-4-1

– 35 –

Pipe hole

Indoor unit

Hook

Thread

Weight

Fig. 8-4-3

Hook

Pipe hole

Installation
plate

8 Mounting screw

1

FILE NO. SVM-03009

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

1. Securely fit the installation plate onto the wall by
screwing it in the upper and lower parts to hook up
the indoor unit.

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

3. Install the installation plate horizontally in the wall.

CAUTION

When installing the installation plate with a
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

5 mm dia. hole

15 mm 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 the power source for exclusive use with the
air conditioner.

NOTE

• Wire type : More than 1.5 mm2 (H07RN-F or

245 IEC66) or 1.3 mm2 (AWG-16)

CAUTION

• This appliance can be connected to the mains in
the following way.
Connection to fixed wiring:
A switch or circuit breaker which disconnects all
poles and has a contact separation of at least
3 mm must be incorporate in the fixed wiring. An
approved circuit breaker or switches must used.

NOTE

• Perform wiring works so as to allow a generous
wiring capacity.

88

8 Mounting

88

screw

ss

∅4 x 25

s

ss

Clip anchor
(local parts)

Fig. 8-4-4

CAUTION

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

• In case of block, brick, concrete or similar type
walls, make 5 mm dia. holes in the wall.

• Insert clip anchors for appropriate mounting screws

8.

NOTE

• Secure four corners and lower parts of the
installation plate with 6 to 8 mounting screws to
install it.

– 36 –

FILE NO. SVM-03009

8-4-4. Wiring connection

Air Inlet grille

2

1

Cord clamp

Screw

Terminal
cover

Screw

Terminal block

Front panel

Earth
line

CAUTION

• Be sure to refer to the wiring system diagram
labeled inside the front panel.

• Check local electrical cords and also any specific
wiring instructions or limitations.

Connecting cable

a

b

o

u

t 1

5

c

m

Fig. 8-4-6

<Stripping length of connecting cable>

10

10

40

50

Connecting cable

Fig. 8-4-5

<How to connect the connecting cable>
Wiring of the connecting cable can be carried out

without removing of 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 (according to local
cords) into pipe hole on the wall.

4. Take out the connecting cable through the cable
slot on the rear panel so that it protrudes about
15 cm from 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. Fix the terminal cover, rear plate bushing and air
inlet grille on the indoor unit.

Earth line

Fig. 8-4-7

NOTE

Use stranded wire only.

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

Fig. 8-4-8

NOTE

Connect the earth line to the metallic part (i mark)
located at the side of 3P terminal.

<How to install the air inlet grille on the indoor unit>

• When attaching the air inlet grille, the contrary of

the removed operation is performed.

Fig. 8-4-9

– 37 –

FILE NO. SVM-03009

8-4-5. Piping and Drain Hose Installation
<In case of rightward piping>

• After scribing slits of the body-right by a knife or a
making-off pin, cut them by a pair of nippers or the
like.

Slit (Body-right)

Fig. 8-4-10

<In case of downward piping>

• After scribing slits of the body-right by a knife or a
making-off pin, cut them by a pair of nippers or the
like.

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

(To the forefront of flare)

400 mm

300 mm

R 30 mm (Use polisin (polyethylene)
core or the like for bending pipe.)

43 mm

80

Liquid side

Gas side

Outward form of indoor unit

Use the handle of screwdriver, etc.

Fig. 8-4-12

NOTE

If the pipe is bent incorrectly, the indoor unit may
unstably be set 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.

Slit (Body-right)

Fig. 8-4-11

<Left-hand connection with piping>

Bend the connecting pipe so that it is laid within 43 mm
above the wall surface. If the connecting pipe is laid
exceeding 43 mm above the wall surface, the indoor
unit may unstably be set on the wall. When bending the
connecting pipe, make sure to use a spring bender so
as not to crush the pipe.

Bend the connection pipe within a radius of 30 mm.

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

• Carefully arrange pipes so that any pipe does not
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 dewing results in a machine trouble, make
sure to insulate both the connecting pipes. (Use
polyethylene foam as insulating material.)

• When bending a pipe, carefully do it not to crush
it.

Connecting cable

Drain hose

– 38 –

FILE NO. SVM-03009

8-4-6. Indoor unit fixing

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 up 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 up on the installation plate.

1

2

Hook

Hook here

1 Installation

plate

Press

(unhook)

Fig. 8-4-13

• For detaching the indoor unit from the installation
plate, pull the indoor unit toward you while pushing
its bottom up at the specified parts.

8-4-7. Drainage

1. Run the drain hose sloped downwards.

NOTE

• Hole should be made at a slight downward slant on
the outdoor side.

Do not form the
Do not rise the
drain hose.

50 mm
or more

Do not put
the drain
hose end
into water.

drain hose into

a wavy shape.

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

Fig. 8-4-15

2. Put water in the drain pan and make sure that the
water is drained out of doors.

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

Fig. 8-4-14

Shield pipe

Drain hose

PushPush

Inside the room

Fig. 8-4-16

Extension drain hose

CAUTION

Arrange the drain pipe for proper drainage from the
unit.
Improper drainage can result in dew-dropping.

This air conditioner has the structure designed to drain
water collected from dew, which forms on the back of
the indoor unit, to the drain pan.
Therefore, do not store the power cord and other parts
at a height above the drain guide.

Wall

Drain guide

Space for pipes

– 39 –

Fig. 8-4-17

FILE NO. SVM-03009

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.

• A place where the drain water does not raise any

problem.

CAUTION

1. Install the outdoor unit without anything blocking
the air discharging.

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

3. In particularly windy areas, install the unit such
as to avoid 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

Rigid (Clutch type)

Outer dia. R410A Conventional

of copper pipe tool used tool used

6.35 0 to 0.5 1.0 to 1.5

9.52 0 to 0.5 1.0 to 1.5

12.70 0 to 0.5 1.0 to 1.5

Imperial (wing nut type, conventional tool)

Outer dia.

of copper pipe

R410A

6.35 1.5 to 2.0

9.52 1.5 to 2.0

12.70 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.

Warp

Strong

wind

Fig. 8-5-1

CAUTION

• Do not apply excess torque.

• Otherwise, the nut may crack depending on the

conditions.

– 40 –

FILE NO. SVM-03009

(Unit : N·m)

Outer dia.

of copper pipe

Tightening torque

∅6.35 mm 16 to 18 (1.6 to 1.8 kgf·m)
∅9.52 mm 30 to 42 (3.0 to 4.2 kgf·m)

∅12.70 mm 50 to 62 (5.0 to 6.2 kgf·m)

• Tightening torque of flare pipe connections

The operating pressure of R410A is higher than that of
R22. (Approx. 1.6 times). It is therefore necessary to
firmly tighten the flare pipe connecting sections (which
connect the indoor and outdoor units) up to the
specified tightening torque. Incorrect connections may
cause not only a gas leakage, but also damage to the
refrigerant cycle.

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

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. (If oil inside of the vacuum pump
enters into the air conditioner, which use R410A,
refrigeration cycle trouble may result.)

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 the vacuum
pump.

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

4. Operate the vacuum pump to start 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.

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)

– 41 –

Compound pressure gauge

-101kPa (-76cmHg)

Handle Lo

Charge hose

(For R410A only)

Connecting pipe

Packed valve at liquid side

Fig. 8-5-6

Pressure gauge

Manifold valve

Handle Hi
(Keep full closed)

Charge hose
(For R410A only)

Vacuum pump
adapter for
counter-flow
prevention
(For R410A only)

Vacuum

pump

Packed valve at gas side

Service port
(Valve core (Setting pin))

FILE NO. SVM-03009

70

60

L

N

10

70

10

10

80

10

123

TO CHARGE REFRIGERANT

Refrigerant

No need to charge
refrigerant

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

RAS-24UKHP-ES-1/24UAH-ES-1 RAS-18UKHP-ES2/18UAH-ES2

RAS-24UKP-ES-1/24UA-ES-1 RAS-18UKP-ES2/18UA-ES2

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 50 to 62 N·m
(∅12.70 mm) (5.0 to 6.2 kgf·m)

Gas side 30 to 42 N·m
(∅9.52 mm) (3.0 to 4.2 kgf·m)

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

Service port

9 to 10 N·m
(0.9 to 1.0 kgf·m)

Hexagonal wrench
is required.

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.

<Stripping length of connecting cable>

Terminal block

LN 1 32

Terminal
screw

Cord clamp

Power supply cord

Earth line

Screw

Cord clamp

Connecting cable

m

m

4

Fig. 8-5-7

Power supply cord

Earth line

Connecting cable

Fig. 8-5-8

Model

Power source 50 Hz, 220 – 240 V Single phase
Maximum running current 18A 16A
Plug socket & fuse rating 20A 20A

Power cord

RAS-24UKHP-ES-1/ RAS-18UKHP-ES2/

RAS-24UKP-ES-1 RAS-18UKP-ES2

2

(H07RN-F or 245 IEC66)

4 mm
or 3.5 mm

2

(AWG-12)

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)

– 42 –

FILE NO. SVM-03009

8-6.How to Set Remote Control Selector

Switch

When two indoor units as installed in seperated rooms,
there is no need to change the selector switch.

<Remote control selector switch>

• When two indoor units are installed in the same
room or the adjacent two rooms, they may be
controlled simultaneously with a single remote
control. To prevent this, set either unit and its
remote control to B setting. (Both units are set to A
setting before shipment.)

• The remote control signal is not recived when the
indoor unit setting is different from the remote
control one.

1. Set the remote control selector switch with the
indoor unit.

1) Turn the circuit breaker of the main power switch off
before setting the selector switch.

2) Remove the Air inlet grille and Front panel. (Refer to
page 63, 10-1)

3) Select the terminal of selector switch from
[A position] to [B position].

2. Set the remote control selector switch with the
remote control

[B] is indicated on the liquid crystal display when
setting remote control selector switch to B. [A] is
not indicated on the display even if the selector
switch is set to A.

1) Load the remote control with the batteries.

2) Press the [CHECK] button using something with
sharp point. (The preset temperature on the remote
control changes to [00].)

3) Press the [MODE] button while pressing the
[CHECK] button, [B] is indicted at the right of the
present temperature display.

• To reset the switch to the [A] setting, press the
[MODE] button again while pressing the [CHECK]
button.

A

A
B

B

Fig. 8-6-1

Slector
switch

A
B

FAN MODE

SWING

FIX

ON

OFF SET CLR

FILTER

PRESET

START/STOP

ECO

TIMER

AUTO

Hi-POWER

MEMO

CLOCK CHECKRESET

[MODE] button

[CHECK] button

Fig. 8-6-2

3. Confirm that the indoor unit can operate with
the new setting.

– 43-1 –

FILE NO. SVM-03009

8-7.Others

8-7-1. Gas leak test

Electric parts cover

D

Flare nut connections
(Outdoor unit)

B

Valve stem cap connection

Fig. 8-7-1

• Check the flare nut connections, valve stem cap
connections and service port cap connections for
gas leak with a leak detector or soap water.

8-7-2. Test operation

C

Flare nut connections
(Indoor unit)

Valve stem cap
connection

A

Service cap connection

8-7-3. 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 TEMPORARY button for about
3 seconds. After 3 seconds, the electronic beeper
makes three short beeps to tell you the Auto
Restart has been selected.

• To cancel the Auto Restart, follow the steps
described in the section Auto Restart Function of
the Owner’s Manual.

To switch the TEST RUN (COOL) mode, press
TEMPORARY b utton for 10 sec.
(The beeper will make a short beep.)

TEMPORARY button

Fig. 8-7-2

– 43-2 –

9. TROUBLESHOOTING CHART

FILE NO. SVM-03009

9-1. T r oubleshooting 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 (5Hz).

9-2.1 Power supply voltage

The line voltage must be AC 220 – 240V. If it is not
within this rage, 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.

The OPERATION lamp blinks to indicate that power is turned on. If the
[START/ST OP] 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.

4 The compressor is not turned on and

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

*5 The PRE-DEF. lamp is indicated when

the Heating operation starts.

*6 The outdoor fan motor stops in the

Heating operation.

7 The compressor is not turned on even

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

8 The operation mode changes in the

Automatic operation.

9 The Fan only operation continues in the

Automatic operation.

10 The ECO operation or Hi-POWER

operation does not work.

11 When [Hi POWER] button is pressed,

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

Note *5 and *6 are for Heat pump model :

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

The PRE-DEF. lamp is indicated during the Defrosting operation or if
the indoor heat exchanger temperature is low when the Heating
operation starts. At this time, the indoor fan motor stops to prevent
cold air from blowing in the room.

When the indoor heat exchanger temperature is high, the outdoor fan
motor is stopped by the high-temperature limit control operation.

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.

– 44 –

FILE NO. SVM-03009

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

• Transferring of operation commands to the outdoor

unit

Table 9-3-1

Lamps Self-diagnosis

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

(5Hz)

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, TIMER and PRE-DEF.

(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.

– 45 –

9-4. Self-Diagnosis by Remote Control

(Check Code)

(1) If the lamps are indicated as shown B to G in Table

9-3-1, exchanger the self-diagnosis by the remote
control.

(2) When the remote control is set to the service

mode, the indoor controller diagnoses the
operation condition and indicate the information of
the self-diagnosis on the display of the remote
control with the check codes. If a fault is detected,
all lamps on the indoor unit will blink at 5Hz and it

will beep for 10 seconds (Pi, Pi, Pi....). The timer

lamp usually blinks (5Hz) during the self-diagnosis.

9-4-1. How to use remote control in service mode

SET CLR

CLOCK CHECKRESET

FILE NO. SVM-03009

(1) Press [CHECK] button with a tip of pencil to set the

remote control to the service mode.

• “00” is indicated on the display of the remote
control.

• The timer lamp on the indoor unit blinks
continuously. (5 times per 1 sec.)

AUTOA

START/STOP

FAN MODE

SWING

ON

ECO

TIMER

FIX

OFF SET CLR

FILTER

A
B

PRESET

AUTO

Hi-POWER

MEMO

CLOCK CHECKRESET

(2) Press [TIMER 8] button.

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

00 01 1d 1E02 22

• Check the unit with all 35 check codes (00 to 22).
as shown in Table 9-4-1.

• Press [TIMER 9] button to change the check
code backwards.

If there is a fault, the indoor unit will beep f or 10
seconds (Pi, Pi, Pi...).
Note the check code on the display of the remote
control.

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

• All lamps on the indoor unit will blink. (5 times
per 1 sec.)

(3) Press [CLR] button. After service finish for clear

service code in memory.

• “7F” is indicated on the display of the remote
control.

• Alphanumeric characters are used for the check code.
is 5. is 6.

is A. is B.
is C. is D.

* This illustration is only for Heat pump model.

For Cooling only model, there is not the ( ) symbol.

– 46 –

(4) Press [START/STOP] button to release the service

mode.

• The display of the remote control returns to as it
was before service mode was engaged.

Table 9-4-1

Block level Diagnosis function

Check

code code status

Block

Indoor
P.C. board

The block is
unidentifiable

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 variation of TC, 5 minutes
after starting the compressor,
is 2K or less.

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.

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.

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-03009

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. Check whether or not the TC sensor
comes off.

2. Check whether or not it is possible to
operate the compressor and the
outdoor fan motor.

3. Check gas leak.

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.

– 47 –

9-5. How To Diagnose Faulty Parts

[04 Serial signal error] (Heat pump model)

FILE NO. SVM-03009

Operation

Check item

Conceivable principle cause

Measure

Does outdoor

unit operate?

YES

NO

Are 1, 2 and 3 crossover

wires connected properly?

YES

Is connector

connected properly?

YES

Does LED (Orange) on

outdoor P.C. board blink?

YES

Does LED (Green) on

outdoor P.C. board blink?

YES

NO

NO

NO

NO

Outdoor P.C. board

is defective.

Indoor P.C. board

is defective.

Item by symptoms

Connect crossover

wires properly.

Connect connector

properly.

Replace

P.C. board.

Replace

P.C. board.

[08 Four-way valve error] (Heat pump model)

Does four-way valve

operate properly?

YES

Is TC sensor

resistance value

(10kΩ at 25°C) normal?

NO

NO

YES

Does coil terminal

have 220 − 240 V

in heating operation?

YES

Are circuit

wires normal?

YES

Is outdoor P.C. board

normal?

YES

YES

NO

NO

Four-way valve

is defective.

Outdoor P.C. board

is defective.

(CN11 220 − 240V)

Indoor P.C. board

is defective.

Replace

Four-way valve

Circuit check/modification

Replace

P.C. board.

Replace

P.C. board.

Replace TC sensor.

– 48 –

[09 Other cycle error] (1) (Heat pump model)

FILE NO. SVM-03009

NO

Replace TC

sensor.

YES

Connect TC

sensor properly.

Does compressor operate?

YES

Is compressor

turned off shortly?

NO

Is TC sensor

resistance value

(10kΩ at 25°C) normal?

YES

Is TC sensor

disconnected from

the sensing element?

NO

NO

YES

Does inner

overload relay

(in compressor)

operate?

NO

Is circuit wiring

normal?

YES

Is outdoor P.C.
board normal?

YES

YES

NO

NO

Check charged amount of refrigerant.

Check defective overload.

Check compressor.

Failure

Wiring check/modification

Outdoor P.C. board

is defective.

Indoor P.C. board

is defective.

Replace

compressor.

Replace

P.C. board.

Replace

P.C. board.

[09 Other cycle error] (2)

NO

Connect

connector

properly.

NO

Replace

condenser.

NO

Replace

fan motor.

Is connector

connected properly?

Is condenser normal?

Is indoor fan

motor normal?

YES

YES

YES

NO

Does indoor
fan operate?

Are filters clogged?

Is TC sensor

resistance value

(10kΩ at 25°C) normal?

Is charged amount

of refrigerant normal?

Is outside air

low load?

YES

NO

YES

YES

NO

YES

NO

NO

YES

Clean filters.

Replace

TC sensor.

Anti-freezing operation

Charge

refrigerant.

Anti-freezing operation

Indoor P.C. board

is defective.

– 49 –

Replacd

P.C. board.

[0C Indoor TA sensor error]

FILE NO. SVM-03009

Is CN04 (TA sensor connector)

connected properly?

YES

Is TA sensor resistance value

(10 kΩ at 25°C) normal?

YES

[0d Indoor TC sensor error]

Is CN05 (TC sensor connector)

connected properly?

YES

NO

NO

NO

Indoor P.C. board is defective.

Connect CN04 properly.

Replace TA sensor.

Replace P.C. board.

Connect CN05 properly.

Is TC sensor resistance value

(10 kΩ at 25°C) normal?

YES

NO

Indoor P.C. board is defective.

[18 outdoor TE sensor error] (Heat pump model)

Is TE sensor connector

connected properly?

YES

Is TE sensor resistance value

(10 kΩ at 25°C) normal?

YES

NO

NO

Replace TC sensor.

Replace P.C. board.

Connect connector

properly.

Replace TE sensor.

Indoor P.C. board is defective.

– 50 –

Replace P.C. board.

[19 outdoor TD sensor error] (Heat pump model)

FILE NO. SVM-03009

Is TD sensor

connected properly?

YES

Is TD sensor resistance value

(50 kΩ at 25°C) normal?

YES

NO

NO

Outdoor P.C. board is defective.

[1E Discharge temp. error] (Heat pump model)

Connect connector

properly.

Replace TD sensor.

Replace P.C. board.

Is protective

controller such as discharge

thermostat normal?

YES

Is charged amount

of refrigerant normal?

YES

Is overload relay normal?

NO

Is TD sensor resistance value

(50 kΩ at 25°C) normal?

YES

NO NO

NO

YES

NO

Are wires connected

to connector properly?

Outdoor P.C. board is defective.

Connect wires to

connector properly.

Check and modify charged

amount of refrigerant.

Unit operates normally.

Replace TD sensor.

Replace P.C. board.

– 51 –

9-6. Troubleshooting for Indoor unit

9-6-1. Power can not be turned on. (The unit does not operate at all.)

FILE NO. SVM-03009

<Primary check>

(1) Is the supply voltage normal?
(2) Is the connection to the AC output OK?
(3) Are the connection of the primary side and the secondary side

of the power transformer inserted into the P.C. board?

(4) 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

Is it possible to

turn on power

supply by pressing

[START/STOP]

button on

remote control?

YES

NO NO

transmission

mark on
remote control
flash normally,

and is its

signal

transmitted

properly?

YES

Operation

Check item

Conceivable principle cause

Measure

Item by symptoms

Remote control

is defective.

Refer to 9-9

Troubleshooting for

Remote Control.

Is fuse (F01)

of indoor

control board

blown?

NO

Is voltage

(DC 12V or 5V)

NO

indicated on rear

of indoor control

board normal?

Is DC
310 − 340V
supplied to

primary side

of transfer

switch?

YES

Are DC 15V,

DC 12V and

DC 7V

supplied to

secondary

side of

transfer

switch?

YES YES

NO

NO NO

Refer to

<Primary check>

or this problem

is one step short

of power P.C.

board block.

Turn off breaker

once and turn it

on again after

removing motor.

YES

YES

Parts (R21,
R22, SG01,

C15, C01, DB01,

C02, IC01

and T01)

are defective.

Are DC 15V,

DC 12V or

DC 7V
supplied to
secondary

side of

transfer

switch?

Does the
fan motor
connector

between

1 and 2

short-circuit?

NO

Microcomputer

is defective.

Transfer switch,

IC (IC01) for

power supply

or fan motor

is defective.

YES

Unit operates

normally.

Replace main

P.C. board.

– 52 –

Replace motor.

FILE NO. SVM-03009

9-6-2. Only indoor fan motor does not operate.

<Primary check>

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

(In heating operation, the indoor fan motor does not operate for approximately 5 minutes after it is turned on,
to prevent a cold air from blowing in.)

Turn off power

supply once, and

turn it on again.

Does

Fan motor

continue to

operate?

NO

Start to operate

indoor unit in

cooling operation

at airflow level

LOW .

Does indoor
fan operate?

YES

Change airflow

level to High .

Is it possible to

change airflow
level to High ?

YES

YES

NO NO

NO

Is it possible to detect

DC 1V or more between

5e and 3d of motor

connector (CN10).

YES

Is it possible to detect DC

310 − 340V between 1e and

3d of motor connector (CN10).

YES

(Motor connection condition)

Is it possible to detect DC 15V

between 4e and 3d of motor

connector (CN10).

YES

Start to operate the indoor unit

in except heating operation.
At this time, is it possible to

detect DC 1V or more

between 5e and 3d of

motor connector (CN10)?

Is it possible to rotate cross-flow

fan by hand properly?

NO

NO

NO

Turn off indoor unit and
remove connector from

motor. Then press

START/STOP button on

remote control to stop

blinking lamp on indoor unit.

Is it possible to detect DC
15V between 4e and 3d

of motor connector (CN10).

Turn off indoor unit and
remove connector from

NO

motor. Then start to

operate indoor unit with

remote control.

Replace indoor

fan motor.

Replace main

P.C. board.

Fan motor

operates

normally.

Turn off indoor unit and rotate

cross-flow fan by hand when the

unit is on standby. At this time,

is it possible to detect DC 1V

or more between 5e and 3d

of motor connector (CN10).

YES

Start to operate the

NO

indoor unit in except

heating operation. At this

time, is it possible to detect

DC 1V or more between

5e and 3d of motor

connector (CN10)? (Check

this condition within 15

seconds after starting unit.)

– 53 –

NO

YES

Replace bearing.

FILE NO. SVM-03009

9-6-3. Indoor fan motor automatically starts to rotate by turning on power supply.
<Cause>

The IC is built in the indoor fan motor. Therefore the P.C. board is also mounted to the inside of the motor.
If the P.C. board is soldered imperfectly or the IC is defective, the fan motor may automatically rotate by turning
on power supply.

<Inspection procedure>

(1) Remove the front panel. (Remove 4 screws.)
(2) Remove the cover of the fan motor lead wires.
(3) Check DC voltage with CN10 connector while the fan motor is rotating.

NOTE:

• Do not disconnect the connector while the fan motor is rotating.

• Use a thin test rod.

Indoor fan starts rotating when power supply is turned on.

(Check output DC voltage of fan motor on P.C. board.)

Measure voltage between 2 (GND:BLACK)
and 3 (V line:YELLOW) of motor connector

(CN10) while indoor fan motor is rotating.

DC 1.0V or more

P.C. board is defective.

Replace P.C. board.

Under DC 1.0V

Motor is defective.

Replace motor.

DC

Yellow

Black

P.C. board

CN10

6 (Blue)
5 (Yellow)

4 (White)
3 (Black)

2 —
1 (Red)

– 54 –

9-6-4. 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>

-Cooling only model-

Turn on power supply.

FILE NO. SVM-03009

Does OPERATION

lamp blink?

YES

Does miniature relay RY04

switch on and off due to

temperature changes?

YES 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

NO

NO NO

NO

Is resistance value of thermo

sensor (TA) and heat exchanger

sensor (TC) normal?

Microcontroller is defective.

Miniature relay RY04 is defective.

NO

NO

Compressor is defective.

Refer to 9-6-1 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.

Is capacitor for

compressor normal?

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 Compressor

NO

NO

NO

NO

Capacitor is defective.

Overload relay is defective.

Compressor is defective.

Gas shortage (Gas leak)

– 55 –

Replace capacitor.

Replace overload relay.

Replace compressor.

Supply gas.

<Inspection procedure>

-Cooling and heating model-

Turn on power supply.

FILE NO. SVM-03009

Does OPERATION

lamp blink?

YES

Is it possible to start

unit by remote control?

YES

Is it possible to detect

DC 15 − 60V between

2 and 3 on terminal block?

YES

Is crossover cable normal?

YES

Is it possible to detect

AC 12V on secondary side

(CN06) of transfer?

YES

Is it possible to detect

DC 5V at IC61 and 12V at IC51?

YES

NO

NO

NO

NO

NO

Refer to item Power
can not be turned on .

Refer to 9-9 Troubleshooting

for Remote Control .

Check TA and TC sensors

or refer to 01 − 04 in Table 9-4-1.

Connect crossover

cable properly.

Replace transfer.

Replace outdoor

P.C. board.

Are TD and TE sensors normal?

(TD=17.9kΩ at 50°C)

(TE=10kΩ at 25°C)

YES

Is it possible to detect

AC 220 − 240V at CN11?

YES

Does MG switch operate?

(Next Page)

NO

NO

NO

Replace sensors.

Replace outdoor

P.C. board.

Replace MG switch.

– 56 –

YES

FILE NO. SVM-03009

Are all of compressor cords normal?

YES

Is compressor motor winding normal?

(Check winding resistor.)

YES

Is capacitor for compressor normal?

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

NO

NO

NO

NO

NO

NO

Compressor is defective.

Capacitor is defective.

Overload relay is defective.

Compressor is defective.

Gas shortage (Gas leak)

Rewire or replace

defective cords.

Replace compressor.

Replace capacitor.

Replace overload relay.

Replace compressor.

Supply gas.

Compressor is defective.

YES

Replace compressor.

– 57 –

FILE NO. SVM-03009

9-7. Troubleshooting for Wiring (Interconnect cable and Serial Signal Wire)

9-7-1. Outdoor unit does not operate.

<Inspection procedure>

(1) Is the voltage between 2 and 3 of the indoor terminal block varied?
(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.

• Prepare a diode for checking.

Terminal block on indoor side

Red

White

Normal condition : Voltage varied between DC15V and 60V.
Abnormal condition : Voltage does not vary.

3

2

1

Terminal block

S5277G

S5277G or equivalent (G or J type)
(Diode with rated voltage of 400V
or more is acceptable.)

Tester

Fig. 9-7-1

9-7-2. 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.

Compressor is turned off and on automatically by thermo sensor

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

Gas shortage
Gas leak
Pipe clogging

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

Refer to 9-6-4 “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.)

– 58 –

FILE NO. SVM-03009

9-8. Troubleshooting for P.C. board

9-8-1. How to check indoor P.C. board
<Cautions for handling P.C. board>

(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
lead wires.

<Inspection procedure>

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

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:

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

Check the defects of the P.C. board with Table 9-8-1.

Table 9-8-1 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.

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 [START/STOP] 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 whenther or not the fuse (F01)
is blown.

Check power supply voltage;

1. Between TP2 and TP3 of CN12
(220 – 240V AC)

2. Between + and – of CN02
(DC310 – 340V)

3. Between C04 and output side
of IC09 (DC15V)

4. Between 12V and GND

5. Between 5V and GND

Check power supply voltage;
<Heat pump model>

1. Between CN31 and CN23
(DC15 – 60V)

<Cooling only model>

1. Between connector of Q33 and
GND (for relay coil (DC12V))

2. Between 1 and 2 of terminal
block for connecting cable

Check whether or not all lamps
(OPERA TION, TIMER, PRE.-DEF .
(or FAN ONLY), ECONO. and AUTO)
are indicated for 3 seconds and they
return to normal 3 seconds later.

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

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

2. The capacitor (C01 and C15),
line filter (L01), resistor (R01), or
the diode (DB01) is defective.

3. IC01, IC02 and T1 are defective.

4. IC01, IC02, and T1 are defective.

5. IC01, IC02, IC07 and T01 are
defective.

<Heat pump model>
IC05 and IC06 are defectice.

<Cooling only model>

1. The wire of the relay coil (RY04)
comes down or the relay drive
(Q33) is defective.

2. CN27 or RY04 is connected
wrongly.

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

– 59 –

FILE NO. SVM-03009

No. Procedure Check points Causes

5 Press [START/STOP] 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 much

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 9-8-2.)

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

6 If the above condition (No. 6) still

continues, start the unit in the
following condition.

• Set the operation mode to HEAT.

• Set the preset temperature much

higher than room temperature.

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 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 9-8-2.)

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

7 Connect the motor connector to the

motor 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 15V) between 3 and
4 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 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.

Table 9-8-2 Approximate resistance value of thermo sensor

Temperature 0°C10°C20°C25°C30°C

Resistance value 33.8 20.35 12.59 10.0 7.99

(kΩ)

9-8-2. How to Shorten Time of Restart Delay Timer

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

with a tip of a pencil.

2 Then press [START/STOP] button to transmit the

signal to the indoor unit.

– 60 –

AUTOA

START/STOP

FAN MODE

SWING

ECO

TIMER

FIX

ON

OFF SET CLR

FILTER

A
B

PRESET

AUTO

Hi-POWER

MEMO

CLOCK CHECKRESET

17

2

1

9-8-3. P.C. Board layout

FILE NO. SVM-03009

Top View

Bottom View

– 61 –

9-9. Troubleshooting for Remote Control

FILE NO. SVM-03009

Is receiver on

indoor unit exposed

to direct sunlight?

YES

NO

Is there any

thyristor fluorescent

light nearby?

YES

YES

NO NO

Press START/STOP

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 START/STOP

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.

– 62 –

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-03009

(2)

(2) (2)

4-screws

(4)

(6) TC sensor

10. PART REPLACEMENT

10-1. Indoor Unit

No. Part name Procedures Remarks

1 Front panel

How to remove the front panel

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

2) Pull the inlet grille toward you to open it and remove
4 screws fixing the front panel.

3) Remove upper 3 hooks of the front panel from the
back body.

4) Open the horizontal grille right below by hand.

5) Pull the lower side of the front panel toward you
until it touches the horizontal grille to remove it.

2 Electrical part

assembly

How to mount the front panel

1) Mount the front panel with the inverse procedure of
“How to remove the front panel”.

2) Push 3 places (right, left and center) of the air
outlet.

3) Check the gap between the front panel and the
back body.
If you operate the air conditioner in cooling or dry
operation without pushing the 3 places, the surface
of the front panel may be covered with frost and
have dewdrops.

1) Remove the front panel with the procedure 1.

2) Remove the screw fixing the electrical part box.

3) Remove the drain guide.

4) Remove the connector (5P) for the fan motor and
the connector (6P) for the louver motor from the
microcomputer assembly.

5) Remove the screw for the earth, and pull the
electrical part base toward you to remove it from the
main unit.

6) Pull out the TC sensor from the sensor holder.

(3) Drain guide

(3)

(5) screws

5P
6P

(2) screws

When assembling the electrical parts
assembly, make the connecting cable
U-shaped and put it in the drain pan.

– 63 –

FILE NO. SVM-03009

No. Part name Procedures Remarks

3 Horizontal grille

1) Remove center 2 shafts of the horizontal grille from
the back body.

2) Remove left shaft of the horizontal grille from the
back body.

3) Remove the horizontal grille from the back body.

(1) Center shafts

(2) Left shafts

4 Heat exchanger

5 Cross flow fan

1) Remove the front panel, electrical parts assembly
and the horizontal grille with procedure 2 and 3.

2) Remove the screw on the rear side of the main unit
to remove the pipe holder.

3) Remove 2 screws fixing the heat exchanger and the
bearing base.

4) Remove 2 screws fixing the heat exchanger fixtures
(upper and lower) and the back body then pull out
the upper side of the heat exchanger slowly.

1) Remove the front panel, electrical parts assembly,
horizontal grille and the heat exchanger with
procedure 4.

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

3) Remove 2 screws fixing the bearing base and the
back body.

4) Pull the cross flow fan toward you.

Pipe holder

(3) 2 screws

(2) Screw

Bearing base

(4) 2 screws

(3) Screws

(2) Set screw

6 Bearing base

7 Fan motor

1) Remove the front panel, electrical parts assembly,
horizontal grille, heat exchanger and the cross flow
fan with procedure 5.

2) Remove the bearing from the bearing base.
If the housing protrudes from the base bearing, put
the housing in position and assemble the bearing to
the bearing base.

1) Remove the front panel, electrical parts assembly,
horizontal grille, and the heat exchanger with
procedure 4.

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

3) Remove 2 screws of the motor fixture.

4) Remove the lower side of the body (R) and move it
right to remove it.

5) Remove the motor from the motor fixture.

– 64 –

When assembling the cross flow fan, fix it
with the set screw at the position where the
gap between the back body and the right
surface of the cross flow fan is 4 mm.

Bearing base

Bearing

(4)

(3) 2 screws

(4) BODY (R)

Motor fixture

FILE NO. SVM-03009

10-2. Outdoor Unit (RAS-24UAH-ES-1, RAS-24UA-ES-1)

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 electrical parts cover.
(4 screws ∅4 x 10L)

3) Remove 2 cord clamps (4 screws ∅4 x 22L) 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)

5) Remove the front cabinet. (2 screws ∅4 x 10L)

6) Remove the side cabinet
(4 screws ∅4 x 10L & 2 screws ∅4 x 14L)

Top cabinet

Front cabinet Side cabinet

4 screws ∅4 x 22L

Electrical
parts cover

2 Running

capacitor
for compressor

3 Running

capacitor
for fan motor

4 Magnetic

contactor

5 Transformer

(24UAH-ES-1 only)

6 P.C. Board

(24UAH-ES-1 only)

7 Spark killer

(24UA-ES-1 only)

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. (2 screws ∅4 x 10L)

3) Disconnect the housing from the P.C. Board.

1) Perform the common procedure 1

2) Disconnect the lead wires from the P.C. Board.

3) Remove P.C.Board after unhooking 4 clams.

1) Perform the common procedure 1

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

3) Disconnect the lead wires from the terminal.

Magnetic contactor

P.C. Board

Transformer

Spark killer

Running capacitor
for compressor

Running capacitor
for fan motor

RAS-24UAH-ES-1

Running capacitor
for compressor

8 Bimetal thermostat

(24UA-ES-1 only)

1) Perform the common procedure 1

2) Remove the terminal cover of compressor.

3) Remove the thermostat holder from the compressor.

4) Disconnect the lead wires from the bimetal
thermostat.

– 65 –

Magnetic contactor

RAS-24UA-ES-1

Running capacitor
for fan motor

Bimetal thermostat

FILE NO. SVM-03009

10-3 Outdoor Unit (RAS-18UAH-ES2)

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 electrical parts cover.
(4 screws ∅4 x 10L)

3) Remove 2 cord clamps (4 screws ∅4 x 22L) 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 front cabinet. (8 scerws ∅4 x 10L)
(Pull the front lower portion toward you, and pull out
it upward to remove it.)

5) Remove the side cabinet. (8 screws ∅4 x 10L)

Remove
8 screws ∅4 x 10L

4 screws ∅4 x 22L 4 screws ∅4 x 10L

2 Running

capacitor
for compressor

3 Running

capacitor
for fan motor

4 Relay

5 Transformer

6 P.C. Board

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) Unlatch the relay and pull it upward.

3) Disconnect the lead wires from the relay terminal.

1) Perform the common procedure 1

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

3) Disconnect the housing from the P.C. Board.

1) Perform the common procedure 1

2) Disconnect the lead wires from the P.C. Board.

3) Remove P.C. Board after unhooking 4 clams.

Running capacitor
for compressor

P.C. Board

Running capacitor
for fan motor

Transformer

Relay

– 66 –

FILE NO. SVM-03009

10-4 Outdoor Unit (RAS-18UA-ES2)

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 electrical parts cover.
(2 screws ∅4 x 10L)

3) Remove 2 cord clamps (4 screws ∅4 x 22L) 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 front cabinet. (8 scerws ∅4 x 10L)
(Pull the front lower portion toward you, and pull out
it upward to remove it.)

5) Remove the back cabinet. (4 screws ∅4 x 10L)

Remove
8 screws ∅4 x 10L

4 screws ∅4 x 22L 4 screws ∅4 x 10L

2 Running

capacitor
for compressor

3 Running

capacitor
for fan motor

4 Relay

5 Spark killer

6 Bimetal thermostat

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) Unlatch the relay and pull it upward.

3) Disconnect the lead wires from the relay 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.

1) Perform the common procedure 1

2) Remove the terminal cover of compressor.

3) Remove the thermostat holder from the
compressor.

4) Disconnect the lead wires from the bimetal
thermostat.

Running
capacitor for
compressor

Running
capacitor for
fan motor

Spark killer

Relay

Bimetal thermostat

– 67 –

11. EXPLODED VIEWS AND PARTS LIST

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

404

FILE NO. SVM-03009

406 (Heat pump model)
407 (Cooling only model)

402

408

403

405

Location Part

No. No.

402 43T60002 Terminal Block, 3P

3P AC300V, 20A

403 43T50004 Sensor, Heat Exchanger

10kΩ 25°C

404 43T69005 Sensor, Thermostat 10kΩ 25°C

Description

Location Part

No. No.

405 43T69066 P.C. Board ASSY, WRS-LED

406 43T69064 P.C. Board ASSY MCC-821
407 43T69065 P.C. Board ASSY MCC-821
408 43T62003 Clamp, Cord

– 68 –

Description

MCC-819

FILE NO. SVM-03009

11-2. Indoor Unit

203

205

201

227

229

228

221

213

208

220

219

222

217

214

215

210

230

223

218

226

212

216

211

209

224

207

232

231

225

204

206

202

Location Part

No. No.

201 43T00048 Front Panel, ASSY
202 43T00049 Grille ASSY (For Heat pump model)
202 43T00050 Grille ASSY (For cooling only model)
203 43T80014 Air Filter (L)
204 43T80013 Air Filter (R)
205 43T80003 Filter, Frame
206 43T01004 Mark
207 43T03010 Body, Right
208 43T03011 Body, Left
209 43T03012 Hide, Claw
210 43T09036 Grille, Horizontal
211 43T70301 Hose ASSY, Drain
212 43T21029 Motor, Stepping
213 43T44025 Refrigeration Cycle Assembly
214 43T47311 Pipe, Deliver
215 43T47312 Pipe, Suction
216 43T11002 Pipe, Shield
217 43T19003 Holder, Sensor
218 43T49009 Spring
219 43T49036 Plate, EVA-Seal
220 43T49039 Holder, Plate, EVA-Seal
221 43T49038 Plate, EVA-Seal

Description

236

Location Part

No. No.

222 43T49037 Holder, Plate EVA-Seal
223 43T79007 Guide Drain
224 43T39016 Fix Motor
225 43T60075 Fan Motor Cord
226 43T21327 Motor, Fan
227 43T20014 Fan, Cross Flow
228 43T22008 Bearing
229 43T39015 Base, Bearing
230 43T03013 Back Body ASSY
231 43T07022 Holder, Pipe
232 43T82007 Plate, Installation
233 43T85386 Owner’s Manual

233 43T85385 Owner’s Manual

234 43T69307 Remote Control, Wireless

234 43T69306 Remote Control, Wireless

235 43T83003 Holder, Remote Control
236 43T62029 Cover, Terminal

234

235

233

Description

(For Cooling only model)

(For Heat pump model)

(For Cooling only model)

(For Heat pump model)

– 69 –

11-3. Outdoor Unit (RAS-24UAH-ES-1)

FILE NO. SVM-03009

7

20

29

36

35

26

25

5

12, 14

4

37

11, 13

39

38

30

31

27

24

1

6

9

2

32

10

40

17

16

19

33, 34

15

8

3

9

28

18

21

23

22

Location Part

No. No.

01 43T00024 Panel, Air Outlet
02 43T00025 Panel, Front
03 43T00026 Panel, Side
04 43T42002 Base Assembly
05 43T19012 Guard, Fin
06 43T19011 Guard, Fan
07 43T91001 Plate, Roof
08 43T42005 Plate, Valve, Pack ed
09 43T15001 Handle
10 43T43307 Condenser Assembly
11 43T46318 Valve, Packed, 12.7Dia.
12 43T46317 Valve, Packed, 6.35Dia.
13 43T47018 Bonnet, 12.7Dia.
14 43T47020 Bonnet, 6.35Dia.
15 43T47013 Capillary Tube, 2.0Dia.
16 43T60324 Terminal Block, 6P
17 43T60325 Filter, Clamp
18 43T41310 Compressor, PA290X3F-4MS
19 43T62014 Protector, Cord
20 43T62015 Protector, Cord
21 43T49011 Base, Spring, A

Description

Location Part

No. No.

22 43T49012 Base, Spring, B
23 43T49019 Spring, Buffer
24 43T21315 Motor, Fan, AC 220 – 240V 50Hz
25 43T20301 Fan, Propeller, 491
26 43T96001 Bushing
27 43T96004 Bushing, Cord
28 43T62013 Cover, E-Parts
29 43T52305 Switch, Magnet, A35, 220 – 240V

50Hz
30 43T55316 MF Capacitor (45µF 370V)
31 43T55317 MF Capacitor (3.5µF 450V)
32 43T96003 Clip, Cable
33 43T46319 Valve, 4way
34 43T46310 Coil, V-4way AC 220 – 240V
35 43T69059 Sensor
36 43T69060 Sensor, TD
37 43T79305 Nipple, Drain
38 43T58301 Transf ormer , TT-05
39 43T69336 PC Board Assembly
40 43T47317 Nut, Flange

Description

– 70 –

11-4. Outdoor Unit (RAS-18UAH-ES2)

24

25

28

FILE NO. SVM-03009

7

31

32

35

26

11

13

2

29, 30

3

8

27

10

14

12

4

33

1

5

17, 18

15, 16

34

9

6

Location Part

No. No.

01 43005144 Cabinet, Front
02 43T00005 Cabinet, Back
03 43T00004 Cabinet, Side
04 43T42305 Base
05 43T00011 Plate, Packed, Valve
06 43T19314 Guard, Fan
07 43T19005 Handle
08 43T62301 Cover, E-Parts
09 43020302 Fan, Propeller
10 43T21332 Motor, Fan, AC 220 – 240V, 50Hz
11 43T47001 Nut, Flange
12 43T63004 Clamp, Lead Wire
13 43T96001 Bushing
14 43T43309 Condenser Assembly
15 43T46317 Valve, Packed, 6.35Dia.
16 43T47020 Bonnet, 6.35Dia.
17 43T46318 Valve, Packed 12.7Dia.
18 43T47018 Bonnet, 12.7Dia.

Description

21

19: Capillary Tube, 1.0 Dia
20: Capillary Tube, 1.7 Dia

Location Part

No. No.

19 43T47308 Capillary Tube, 1.0Dia.
20 43T47014 Capillary Tube, 1.7Dia.
21 43T49011 Base, Spring, A
22 43T49012 Base, Spring, B
23 43T49019 Spring, Buffer
24 43T55316 MF Capacitor (45µF 370V)
25 43T55318 MF Capacitor (2µF 450V)
26 43T60324 Terminal Block, 6P
27 43T41311 Compressor, PA225X3F-4L
28 43T54005 Relay, Power, VC-20FA
29 43T46319 Valve, 4way
30 43T46310 Coil, V-4way AC 220 – 240V, VHV
31 43T69059 Sensor
32 43T69060 Sensor, TD
33 43T79305 Nipple, Drain
34 43T58301 T ransformer , TT-05
35 43T69336 PC Board Assembly

23

22

Description

– 71 –

11-5. Outdoor Unit (RAS-24UA-ES-1)

FILE NO. SVM-03009

20

29

16

26

32

30

43

1

6

31

40

9

10

27

24

25

2

4

7

12, 14

21

23

22

11,
13

19

5

15

3

8

9

28
42

41

18

Location Part

No. No.

01 43T00024 Panel, Air Outlet
02 43T00025 Panel, Front
03 43T00026 Panel, Side
04 43T42002 Base Assembly
05 43T19012 Guard, Fin
06 43T19011 Guard, Fan
07 43T91001 Plate, Roof
08 43T42005 Plate, Valve, Pack ed
09 43T15001 Handle
10 43T43308 Condenser Assembly
11 43T46318 Valve, Packed 12.7Dia.
12 43T46317 Valve, Packed 6.35Dia.
13 43T47018 Bonnet, 12.7Dia.
14 43T47020 Bonnet, 6.35Dia.
15 43T47013 Capillary Tube, 2.0Dia.
16 43T60324 Terminal Block, 6P
18 43T41310 Compressor, PA290X3F-4MS
19 43T62014 Protector, Cord
20 43T62015 Protector, Cord

Description

Location Part

No. No.

21 43T49011 Base, Spring, A
22 43T49012 Base, Spring, B
23 43T49019 Spring, Buffer
24 43T21314 Motor, Fan, AC 220 – 240V 50Hz
25 43T20301 Fan, Propeller, 491
26 43T96001 Bushing
27 43T96004 Bushing, Cord
28 43T62013 Cover, E-Parts
29 43T52305 Switch, Magnet, A35, 220 – 240V

30 43T55316 MF Capacitor (45µF 370V)
31 43T55317 MF Capacitor (3.5µF 450V)
32 43T96003 Clip, Cable
40 43T47317 Nut, Flange
41 43T50002 Thermostat, Bimetal
42 43T63005 Holder, Thermostal, Bimetal
43 43T33002 Spark Killer

– 72 –

Description

50Hz

11-6. Outdoor Unit (RAS-18UA-ES2)

24

25

28

26

14

FILE NO. SVM-03009

7

13

36

2

37

11

8

10

9

12

4

1

6

19: Capillary Tube, 1.7 Dia

15, 16

5

21

23

22

17, 18

38
39

27

Location Part

No. No.

01 43005144 Cabinet, Front
02 43005143 Cabinet, Side
04 43T42305 Base
05 43T00378 Plate, Packed, Valve
06 43T19314 Guard, Fan
07 43T19005 Handle
08 43T62007 Cover, E-Parts
09 43020302 Fan, Propeller
10 43T21319 Motor, Fan, AC 220 – 240V, 50Hz
11 43T47001 Nut, Flange
12 43T63004 Clamp, Lead Wire
13 43T96001 Bushing
14 43T43310 Condenser Assembly
15 43T46317 Valve, Packed 6.35Dia.
16 43T47020 Bonnet, 6.35Dia.

Description

Location Part

No. No.

– 73 –

Description

17 43T46318 Valve, Packed 12.7Dia.
18 43T47018 Bonnet, 12.7Dia
19 43T47014 Capillary Tube, 1.7Dia.
21 43T49011 Base, Spring, A
22 43T49012 Base, Spring, B
23 43T49019 Spring, Buffer
24 43T55316 MF Capacitor (45µF 370V)
25 43T55318 MF Capacitor (2µF 450V)
26 43T60324 Terminal Block, 6P
27 43T41311 Compressor, PA225X3F-4L
28 43T54005 Relay, Power, VC-20FA
36 43T43311 Sub Condenser
37 43T33002 Spark Killer
38 43T63005 Holder, Thermostat, Bimetal
39 43T50002 Thermostat, Bimetal

FILE NO. SVM-03009

TOSHIBA CARRIER (THAILAND) CO.,LTD.

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

AMPHUR MUANG, PATHUMTHANI 12000,THAILAND.

– 74 –