Toshiba RAS-10SKH-X, RAS-10SKH-E, RAS-10SAH-E SERVICE MANUAL

TO SH IB A

SERVICE M ANUAL

AIR-CONDITIONER

SPLIT W A LL TY PE

FILE N O . A 00-9619

RAS-10SKH-E
RAS-10SKHX

RAS-10SAH-E
RAS-10SAHX

P R IN T E D IN JAPA N , N ov.,1996 T oM o

CONTENTS

1. SPECIFICATIONS............................................................................................................ 4

2. CONSTRUCTION VIEWS ................................................................................................ 6

2-1. Indoor Unit .................................................................................................................................. 6

2-2. Outdoor Unit ............................................................................................................................... 7

3. WIRING DIAGRAM .......................................................................................................... 8

4. SPECIFICATIONS OF ELECTRICAL PARTS ................................................................. 9

4-1. Indoor Unit .................................................................................................................................. 9

4-2. Outdoor Unit ............................................................................................................................... 9

5. REFRIGERANT CYCLE DIAGRAM .............................................................................. 10

6. MICRO-COMPUTER BLOCK DIAGRAM .......................................................................11

7. OPERATION DESCRIPTIONS....................................................................................... 12

7-1. FAN ONLY Operation ......................................................................................................... ...... 12

7-2. COOL Operation ....................................................................................................................... 12

7-2-1. Louver Control ......................................................................................................................................13

7-3. DRY Operation.......................................................................................................................... 13

7-4. HEAT Operation............................................................................................................. ........... 14

7-4-1. Louver Control ......................................................................................................................................14

7-4-2. Cool Airflow Control .............................................................................................................................14

7-5. AUTO Operation ............................................................................................................. .......... 15

7-5-1. T emporary Auto.....................................................................................................................................15

7-6. ECONO. Mode................................................................................................................ ........... 16

7-6-1. Cooling...................................................................................................................................................16

7-6-2. Heating .................................................................................................................. .................................16

7-7. Current Limit Control............................................................................................................... 16

7-8. High-Temperature Limit Control (Heating Operation) .......................................................... 17

7-9. Low-Temperature Limit Control (Cooling Operation) .......................................................... 17

7-10. Cool Airflow Prevention Control (Heating Operation) ......................................................... 17

7-11. Defrost Operation ......................................................................................................... ............ 18

7-11-1. Condition to Start the Defrost Operation............................................................................................18

7-11-2. Defrost Operation Time Control .......................................................................................................... 18

7-11-3. Ending Condition at Defrost Operation ..............................................................................................18

7-12. Auto Restart Function ..................................................................................................... ........ 19

7-12-1. How to Set the Auto Restart.................................................................................................................19

7-12-2. How to Cancel the Auto Restart ..........................................................................................................20

7-12-3. In Case of Power Failure during the Timer Operation.......................................................................20

8. INSTALLATION PROCEDURE ...................................................................................... 21

8-1. Safety Cautions ............................................................................................................ ............ 21

8-2. Installation Diagram of Indoor and Outdoor Units ............................................................... 23

8-3. Installation ................................................................................................................................ 24

8-3-1. Optional Parts........................................................................................................................................24

8-3-2. Kit Parts .................................................................................................................................................25

– 2 –

8-4. Indoor Unit ................................................................................................................................ 26

8-4-1. Cutting a Hole and Mounting Installation Plate .................................................................................26

8-4-2. Electrical Work ......................................................................................................................................27

8-4-3. Wiring Connection ................................................................................................................................28

8-4-4. Piping and Drain Hose Installation......................................................................................................30

8-4-5. Indoor Unit Installation .........................................................................................................................31

8-4-6. Drainage.................................................................................................................................................31

8-5. Outdoor Unit ............................................................................................................................. 32

8-5-1. Refrigerant Piping Connection ............................................................................................................33

8-5-2. Vacuum Pumping .................................................................................................................................. 33

8-5-3. Wiring Connection ................................................................................................................................34

8-6. Others ........................................................................................................................................ 35

8-6-1. Gas Leak Test .................................................................................................................. ...................... 35

8-6-2. Test Operation .......................................................................................................................................35

8-6-3. Auto Restart Setting .............................................................................................................................35

9. TROUBLESHOOTING CHART...................................................................................... 36

9-1. What to be Prechecked First .................................................................................................. 36

9-1-1. Power Supply Voltage........................................................................................................................... 36

9-1-2. Incorrect Cable Connection between Indoor and Outdoor Units.....................................................36

9-1-3. Misleading but Good Operations.........................................................................................................37

9-2. Primary Judgement of Trouble Sources ...............................................................................38

9-2-1. Role of Indoor Unit Controller..............................................................................................................38

9-2-2. Display of Abnormalities and Judgement of the Abnormal Spots...................................................38

9-3. Troubleshooting Flowcharts ................................................................................................... 42

9-3-1. Power can not be Turned on ................................................................................................................ 42

9-3-2. Power can not be Turned on after Replacing Indoor PC Board .......................................................43

9-3-3. Outdoor Unit does not Operate ...........................................................................................................43

9-3-4. Only Compressor does not Operate ...................................................................................................4 4

9-3-5. Only Outdoor Fan does not Operate ...................................................................................................45

9-3-6. Only 4-Way Valve does not Operate ....................................................................................................46

9-3-7. Only the Indoor Fan does not Operate................................................................................................47

9-4. How to Check the Remote Control (Including the Indoor PC Board) ................................48

9-4-1. How to Check the PC Board.................................................................................................................49

9-4-2. PC Board Layout ...................................................................................................................................5 1

9-4-3. How to Reduce the Operation Time of the Anti-Restart Timer .........................................................52

10. PART REPLACEMENT ................................................................................................. 53

10-1. Indoor Unit ................................................................................................................................ 53

10-2. Microcomputer ......................................................................................................................... 55

10-3. Outdoor Unit ............................................................................................................................. 56

11. CAUTIONS ON REPLACEMENT OF PC BOARD ASSEMBLY.................................... 57

12. EXPLODED VIEWS AND PARTS LIST......................................................................... 58

12-1. Indoor Unit (1)........................................................................................................... ................ 58

Indoor Unit (2)................................................................................................................ ........... 59

Indoor Unit (3)................................................................................................................ ........... 60

12-2. Outdoor Unit .............................................................................................................. ............... 61

– 3 –

1. SPECIFICATIONS

Item

Capacity

Power source

Power consumption
Power factor

Running current
Starting current

Moisture removal
Noise

Refrigerant
Refrigerant control

Interconnection pipe

Condensate drain pipe

INDOOR UNIT

Dimensions

Net weight
Evaporator type
Indoor fan type

Air volume

Fan motor output
Air filter

OUTDOOR UNIT

Dimensions

Net weight
Condenser type
Outdoor fan type
Airflow volume
Fan motor output

Compressor
Safety device

Auto louver
Usable outdoor temperature range

Indoor (H/M/L)
Outdoor (220/230/240V)
Name of refrigerant
Rated volume

Gas side size
Connection type
Liquid side size
Connection type
Maximum length (of one way)
Maximum height difference

Indoor unit
Outdoor unit

Outer diameter

Height
Width
Depth

High fan
Medium fan
Low fan

Height
Width
Depth

Model
Output

Model

kW

*1

Phase
V
Hz
kW
%
A
Indoor/Outdoor
A
lit/h
dB
dB

kg

mm

mm

m *2

↑
↓

m
mm

mm
mm
mm
kg

m3/h
m3/h
m3/h
W

mm
mm
mm
kg

m3/h
W

W

°C

RAS-10SKH-E/10SAH-E, RAS-10SKHX/10SAHX

COOLING

220V

2.65

220V

0.11/4.58

230V

2.68

0.98/0.99/1.02
95/92/90

230V

0.11/4.57

Polypropylene net filter (Washable)

21 ~ 43

240V

2.70

220/230/240

240V

0.11/4.61

Capillary tube

Flare connection

Flare connection

RAS-10SKH-E/RAS-10SKHX

Finned tube

Cross flow fan

RAS-10SAH-E/RAS-10SAHX

Finned tube

PH120T1-4C

Fuse, Overload relay

220V

3.00

Single

50

220V

0.11/4.17

19

1.2
41/36/31
47/48/49

R-22

0.74

9.52

6.35

10

5

16

265
790
174

8

600
500
400

19

530
770
200

31

Propeller

1600

18

750

Yes

HEATING

230V

3.05

0.89/0.90/0.91
95/92/88

230V

0.11/4.16

– 5 ~ 21

240V

3.10

240V

0.11/4.22

Specifications are subject to change without notice.

– 4 –

Note : *1

• Capacity is based on the following temperature conditions.

JIS C9612-1994Condition

Temperature

(DB)

Indoor unit inlet air temperature

(WB)

(DB)

Outdoor unit inlet air temperature

(WB)

Notes : *2 CHARGELESS

• No additional refrigerant required.

• This air conditioner accepts a connection piping length of up to 10m and a head of up to 5m.

• There is no need to add the refrigerant as long as the total length of the connection piping is up to 10m.

Cooling

27°C
19°C
35°C
24°C

Heating

20°C
12°C
7°C
6°C

– 5 –

2-1. Indoor Unit

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RAS-10SKH-E
RAS-10SKHX

Air inlet

2. CONSTRUCTION VIEWS

Air filter

790

Heat exchanger

174

265

Air outlet

232 326 232

Drain hose (0.54m)

Hanger

Connecting pipe (0.39m)

(Flare ø9.52)

790

Hanger

321

1800

10SKH-E : Without power cord
10SKHX : With power cord

Connecting pipe (0.49m)

(Flare ø6.35)

Front panel

Back body

47

50

10

47

Knock out system

Knock out system

50

10

65965.5
450

Hanger

326

66 or more

Minimum
distance

2.5

46

Minimum
distance

17 20

265

to wall

120 or more 120 or more

3.5

40.5

Center line

to ceiling

Installation
plate outline

HangerHanger

790

– 6 –

12626931976

65.5
Hanger

For stud bolt
(ø8~ø10)

For stud bolt
(ø6)

Minimum
distance to wall

20 2037

40.5

60.5

Wireless
remote
control

Remote
control
holder

55

136

16

112.8

559.6

2-2. Outdoor Unit

RAS-10SAH-E
RAS-10SAHX

Detail Drawing

A

600

36
50

216

230

25

ø11x14 Hole

Handle

R10

ø6 Hole

11

A

230

216

30

Fan guard

36

50

600 85

111

ø25 Drain hole

8-ø6 Holes
(For fixing the outdoor unit)

4-ø11x14 Long holes
(For anchor bolt ø8-ø10)

111

Gas side (flare ø9.52)

Liquid side (flare ø6.35)

200

12

11

525

5

530

ø420

268

89

59

TOSHIBA

770 59

770

268

89

Electric
parts cover

Z

54 62

Access for
charging

250

230

Inlet port

100 or more

View

Z

600

Inlet port

45 or more

Visible outline
of the product

Outlet
port

Center

200 or more

Mounting dimension of anchor bolt

port

600 or more

(Minimum distance
of the wall)

4-ø11x14 Long holes

(For anchor bolt ø8-ø10)

– 7 –

3. WIRING DIAGRAM

Model Section A

RAS-10SKH-E/SAH-E

220/230/240V ~

50Hz

RAS-10SKHX/SAHX

220/230/240V ~

50Hz

GRN&YEL

Section A

L
N

POWER

TERMINAL

BLOCK

BLK

BRW

CN27

L
N

P04

BLU

44

11
2
3

L
N

SG01

DSA

RY02

T02

C.T.

WHI

THERMAL FUSE

77˚C × 2

R109

VARISTOR

F01 FUSE

T3.15A

250V

3

3

RY01

4

4

BLK

RY03

RY04

CR01

CR02

GRY

1
1

R21

LOUVER

MOTOR

GRY

3
3

CN04

CN07

BLU

6
6

R116

IC04

C01

C15

L01

4

23

BLU

2
2

56789

BLU

BLU

4

56789

3

4

56789

3

BLU

BLU

1

BLU

1
1

INFRARED RAYS RECEIVE

AND INDICATION PARTS

PNK

5
5

R01

PNK

YEL

4
4

BLK

ORN

RED

3

2

3

2

DB01

CN13

WHI

CN25

BRW

1
1

C02

FAN MOTOR

DC

MOTOR

BLK

BLU

YEL

WHI

5
5

RED

4

3

2

1

4

3

2

1

CN10

MAIN P.C. BOARD

MCC-713

T01

C06

IC

IC01

2

1

CN03 CN01

2

1

BLK

BLK

THERMO
SENSOR

(TA)

EXCHANGER

DC35V

DC12V

DC7V

DC0V

IC02

2

1

2

1

BLK

BLK

HEAT

SENSOR

(TC)

OVER LOAD

COMPRESSOR

RELAY

BLK

INDOOR

TERMINAL

BLOCK

BLK

RED

CAPACITOR

PNK

WHI

BLK

SOLENOID

COIL

RUNNING

BLK

1

1

BLK

RED

WHI

2

2

RED

RED

BLU

GRN&YEL

3

4

3

4

GRN & YEL

CHASSIS

RUNNING

CAPACITOR

FAN MOTOR

INDOOR

OUTDOOR

WHI

BLK

– 8 –

DSA : Surge absorber
C.T : Current trans

COLOR IDENTIFICATION

:

BRW

:

RED

:

WHI

:

YEL

:

BLU

:

BLK

:

GRY

:

PNK

:

ORN

GRN&YEL

:

BROWN
RED
WHITE
YELLOW
BLUE
BLACK
GRAY
PINK
ORANGE
GREEN &

YELLOW

4-1. Indoor Unit

RAS-10SKH-E
RAS-10SKHX

4. SPECIFICATIONS OF ELECTRICAL PARTS

No.

1

Fan motor (for indoor)

Thermo sensor

2

(TA-sensor)

3

DC-DC transformer (T01)

4

Microcomputer
Power relay (RY01), Com-

5

mon relay (RY02)
Heat exchanger sensor

6

(TC-sensor)

7

Line filter (L01)

8

Diode (DB01)

9

Capacitor (C02)

10

Fuse (F01)
Relay (for outdoor fan motor,

11

solenoid coil) (RY03, RY04)

12

Power supply IC (IC01)

13

Varistor (R21, 109)

14

Resistor (R01)

15

Current trans (T02)

Parts name

Type

ICF-35-19-3

or

TICF-35-19-3

(microprocessor)

SWT-34

TMP87CK40F

DI1U

(microprocessor)

RF-103YOR6

RBV-406

CEAUF2W101M20

MT3

AJQ1341

MA2830-FJ

15G561K

ERF-5TK5R6

CT422920S-01

Specifications

Output (Rated) 19W, 2pole, 1phase, 220/230/240V, 50Hz

10kΩ at 25°C
DC390V, Secondar y DC35V, 12V, 7V

Coil : DC12V 75mA, Rated AC250V 20A

10kΩ at 25°C
10mH, AC 0.6A

4A, 600V
100µF, 450V
T3.15A, 250V

Coil DC12V, 33mA, Rated 1A 250V AC
4A, 600V

560V

5.6 Ω, 5W

4-2. Outdoor Unit

RAS-10SAH-E
RAS-10SAHX

No.

1

Compressor

2

Fan motor (for outdoor)

Running capacitor

3

(for fan motor)
Running capacitor

4

(for compressor)
Solenoid coil

5

(for 4-way valve)

6

Overload relay

Parts name

Type

PH120T1-4C

UE6-21SJ5P

SK-50CMP

SK-40CMP25U1

LB60012

J-MRA99269-9200

Specifications

Output (Rated) 750W, 2pole, 1phase, 220/230/240V, 50Hz
Winding resistance (Ω)

(at 20°C)
Output (Rated) 18W, 6pole, 1phase, 220/230/240V, 50Hz

Winding resistance (Ω)
(at 20°C)

500V AC, 1.5µF

400V AC, 25µF

AC : 200/240V
U/T 6.8A (90°C), OPEN 135±5°C, CLOSE 69±11°C

Red-Black

4.53

Red-Black

370

White-Black

White-Black

– 9 –

8.73

370

5. REFRIGERANT CYCLE DIAGRAM

g

RAS-10SKH-E / RAS-10SAH-E
RAS-10SKHX / RAS-10SAHX

Cooling

Indoor unit

Evaporator

T1

0.39m
(Connecting pipe)
ø9.52

O.D.:9.52mm O.D.:6.35mm

Cooling

Heating

Heating

Packed valve

Heating

4-way valve

Cooling

Cooling
Heatin

P

(ø9.52)

Compressor

PH120T

Accumulator

Propeller fan
Outdoor unit

Cross flow fan

Optional piping kits
RB-P31BEF1 (3m)
RB-P51BEF1 (5m)
RB-P71BEF1 (7m)

1

-4C

Condenser

Packed valve

(ø6.35)

Capillary tube

ø1.7x1400

Dryer

Refrigerant
R-22 0.74kg

Mark( )means check points of Gas Leak

0.49m
(Connecting pipe)
ø6.35

Fig. 5-1

Table 5-1

Heating

Cooling

50Hz

Standard
High temperature*1
Low temperature
Standard
High temperature
Low temperature

Standard pressure

P

(kg/cm²G)

10SKH-E

10SKHX

15.0

19 ~ 23

12.5

6.0

6.5

4.0

Surface temp. of heat

exchanger interchanging

pipe T1 (°C)

10SKH-E

10SKHX

40.0

52.0 ~ 59.0

35.0

12.0

15.0

2.0

Fan speed

(indoor)

High
Low
High
High
High
Low

Note :

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

1 • During heating overload, the high temperature limit control operation is included.

*

– 10 –

Ambient temp.

conditions DB/WB

(°C)

Indoor

20/–
27/–

20/–
27/19
32/23
21/15

Outdoor

7/6

21/15

–10/–10

35/24
43/26
21/15

6. MICRO-COMPUTER BLOCK DIAGRAM

Operation

C. P. U

Timer

Display

Functions

• Louver Control

Display

ECONO.

Sign Display

• 3-minute Delay at Restart for Compressor

PRE-DEF.

Sign Display

• Motor Revolution Control

Indoor

Fan Motor

• Processing

(Temperature Processing)

• Timer

Louver

ON/OFF Signal

4-Way Valve

ON/OFF Signal

Outdoor Fan

ON/OFF Signal

Compressor

ON/OFF Signal

Motor

Louver

RelayRelayRelay

Relay Driver, Louver Driver

RY01 RY03 RY04

4-Way ValveOutdoor Fan Motor

Compressor

RY02

Relay

Main Unit Control Panel

Current Sensor

Thermo Sensor

Heat Exchanger Sensor

Initializing Circuit

Infrared

(Compressor Current)

Infrared Rays Signal Receiver

Oscillator Circuit

Clock Frequency

Rays

Remote Control

Operation (START/STOP)

Circuit

Power Supply

Thermo Setting

Operation Mode Selection

AUTO, COOL, DRY, HEAT, FAN ONLY

Noise Filter

ON TIMER Setting

Fan Speed Selection

OFF TIMER Setting

– 11 –

ECONO.

Louver AUTO Swing

Louver Direction Setting

AC220/230/240V ~

50Hz

7. OPERATION DESCRIPTIONS

7-1. FAN ONLY Operation

(MODE of the remote control : FAN ONLY)
(1) During this mode, the relay R Y01 is always turned

off so that only the indoor fan is operated. RY 02
is always turnd on.

1) When the FAN is set to AUTO, the indoor fan
motor operates as shown in Fig 7-1-1.

2) When the FAN is set to LOW, MED, or HIGH,
the indoor fan motor operates with a constant
in volume as listed in Table 7-1-1.

28
27
26
25

(Room temp. – Set temp.)

Set

24

temp.

Fig. 7-1-1 Auto setting of air volume

Table 7-1-1 Manual setting of FAN SPEED

Indication of

FAN SPEED

HIGH

MED
LOW(+)

LOW

LOW

HIGH Air volume

(m3/n)

7-2. COOL Operation

(MODE of the remote control : COOL)
(1) Compressor 4-way valve, outdoor fan and

operation display are controlled as shown in Fig.
7-2-1.

+1

(Room temp. – Set temp.)

Set

0

temp.

ON

ON ON

OFF

(RY01)

Compressor

Fig. 7-2-1

(2) Relays R Y01 and R Y02 are turned on to energize

the outdoor unit, and a cool operation is carried
out.

1) When the FAN is set to AUTO, the indoor fan
motor operates as shown in Fig 7-2-2.

2) When the FAN is set to LOW, MED, or HIGH,
the indoor fan motor operates with a constant
in volume as listed in Table 7-1-1.

ON

OFF

OFF

(RY02)

(RY04)

4-way valve

Common relay

Outdoor fan

(RY03)

OPERATION

display

LOW
MED

HIGH

400
500
600

(2) Once the setting is made, the operation mode is

memorized in the microcomputer so that the same
operation can be effected thereafter simply by
pushing the START/STOP button.

– 12 –

FAN

Manual

According
to the set

position

+4
+3
+2
+1

(Room temp. – Set temp.)

Set

0

temp.

RY01

OFF

AUTO

HIGH

MED

LOW(+)

LOW
LOW

(continuous)

Fig. 7-2-2

(3) Once the setting is made, the operation mode is

memorized in the microcomputer so that the same
operation can be effected thereafter simply by
pushing the START/STOP button.

7-2-1. Louver Control

(1) By pushing the SET button of the remote control

during the operation, the louver can be set to the
desired position.

And the louver position is stored in the microcom­puter, the louvers will be set to the position
automatically at the next operation.

(2) When the AUT O b utton is pushed, the louv er v er-

tically swings within range of 25deg.

7-3. DRY Operation

(MODE of the remote control : DRY)
(1) Compressor 4-way valve, outdoor fan and

operation display are controlled as shown in Fig.
7-3-1.

ON:6min.

+3

ON:6min.

OFF:4min.

OFF:4min.

+2

+1

(Room temp. – Set temp.)

Set

0

temp.

ON

ON:5min.

OFF:5min.

OFF

(RY01)

Compressor

Common relay

OFF

OFF

(RY04)

(RY02)

4-way valve

ON

ON:5min.

OFF:5min.

(RY03)

Outdoor fan

OPERATION

Fig. 7-3-1

• The microprocessor turns the compressor on
and off at regular intervals (4 to 6 minutes on
and/or off). During the compressor off, the
indoor fan will operate in the super low position.

• The indoor fan will operate in the AUTO
position.

(2) The pattern of operation depending on the relation

between room temperature and set temperature
is shown below:

display

– 13 –

Room temp.

Set temp.+1
Set temp.

Compressor
Outdoor fan

Indoor fan

ON ON ON ON

OFF OFF OFF

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

*

Super Low

Fig. 7-3-2

7-4. HEAT Operation

(MODE of the remote control : HEAT)
(1) Relays, 4-way valve, outdoor fan and operation

display are controlled as shown in Fig. 7-4-1.

0

OFF

ON

ON

(RY04)

(RY02)

Common relay

(RY03)

4-way valve

Outdoor fan

OPERATION

–1

(Room temp. – Set temp.)

Fig. 7-4-1

OFF

ON ON

ON

(RY01)

Compressor

display

7-4-1. Louver Control

(1) By pushing the SET button of the remote control

during the operation, the louver can be set to the
desired position.

(2) When the AUT O b utton is pushed, the louv er v er-

tically swings within range of 25deg.
And the louver position is stored in the microcom-

puter, and at the next operation, the louvers will
be set to the stored position automatically at the
next operation.

7-4-2. Cool Airflow Control

(1) If the indoor heat-exchanger temperature detected

by the indoor heat-exchanger sensor is 20°C or
below , the indoor fan stops and if the temperature
rises to 25°C or above, the fan is restarted.

Details are in 7-10.

(2) Relays R Y01 and R Y02 are turned on to energize

the outdoor unit, and a heat operation is carried
out. The indoor fan motor operates as shown in
Fig. 7-4-2, when the FAN is set to AUTO.

The motor operates with a constant air volume as
listed in Table 7-1-1, when the F AN is set to LOW,
MED, or HIGH.

RY01 OFF

Set

0

temp.

-1

-2

-3

-4

(Room temp. – Set temp.)

AUTO

LOW
LOW(+)
MED(-)

MED

FAN

Manual

According
to the set
position

Fig. 7-4-2

(3) Once the setting is made, the operation mode is

memorized in the microcomputer so that the same
operation can be effected thereafter simply by
pushing the START/STOP button.

– 14 –

7-5. AUTO Operation

(MODE of the remote control : AUTO)
(1) One of the 3 modes, Cooling, Fan only and Heat-

ing is selected according to room temperature at
which operation is to start, as shown in Fig. 7-5-1.
The Fan mode will continue until room tempera­ture reaches a level at which another mode is se­lected.

7-5-1. Temporary Au to

When the TEMPORARY button is pushed, the set
temperature is fixed at 24°C and controlled in accor­dance with the chart shown in Fig. 7-5-1.

Cooling mode

+4

Cooling mode

+1

Fan only mode

–1

Heating mode

(Room temp. – Set temp.)

(The same cooling mode as the room temperature control is set at set temp. –1˚C)
The Louver moved downward.

(The same cooling mode as the room temperature control is set at set temp. –1˚C)

(Only the indoor fan operates at Low speed)

(The same heating mode as the room temperature control is set at set temp. +1˚C)

Fig. 7-5-1

– 15 –

7-6. ECONO. Mode

7-7. Current Limit Control

When the ECONO. button is pushed, during COOL,
HEAT and AUTO operation, the OPERATION display
is turned off and the ECONO. display is lit and the
indoor unit operates quietly and mildly with controlling
airflow .

7-6-1. Cooling

(1) In the ECONO. mode, the set temp. by the remote

control is changed automatically as shown in Fig.
7-6-1.

(2) Fan speed → LOW

(˚C)

Set temp.
is changed

+2

Set temp.
is changed

+1

Set temp.

ECONO. button
is pushed

1H 2H TIME0H

The microprocessor detects the input current so as to
prevent it exceeds a specified value by means of
controlling the outdoor fan control as described in (1)
and (2).

(1) Current limit control (Cooling)

Control is performed as shown below by detect­ing the compressor operation current with a cur­rent sensor (C.T).

Compressor Outdoor fan

4

Input
current

10A I

9A I

More than I

4

3

More than I3 continues for 5 minutes

continues for 3 seconds

OFF

OFF

ON

Fig. 7-7-1

(2) Current limit control (Heating)

Control is performed as shown in Fig. 7-7-2.

Fig. 7-6-1

7-6-2. Heating

(1) In the ECONO. mode, the set temp. by the remote

control is changed automatically as shown in Fig.
7-6-2.

(2) Fan speed → LOW

ECONO. button
is pushed

1H 2H TIME0H

Set temp.

-1
Set temp.

is changed

-2

Set temp.
is changed

(˚C)

Input
current

10A I

9A I

8A I

7.5A I

Compressor Outdoor fan

More than I

4

3

2

1

More than I3 continues for 5 minutes

4

continues for 3 seconds

OFF

OFF

ON OFF

ON

Fig. 7-7-2

Fig. 7-6-2

– 16 –

7-8. High-Temperature Limit Control

(Heating Operation)

7-10. Cool Airflow Prevention Control

(Heating Operation)

The microprocessor detects the indoor heat exchanger
temperature so as to prevent exceeding the
condensate pressure.

Control is performed as shown in Fig. 7-8-1.

Heat exchanger
temperature

(˚C)

60

*

1

53

52

*

1 ····· Only outdoor fan is turned off.

Compressor,

Outdoor fan

OFF

ON

Fig. 7-8-1

7-9. Low-Temperature Limit Control

(Cooling Operation)

(1) During the heating operation, the indoor fan speed

is controlled automatically in accordance with the
indoor heat exchanger temperature to prevent
blowing the cool air.

Control is performed as shown in Fig. 7-10-1.

Heat exchanger
temperature

(˚C)

30
25
20

Indoor fan speed

According to the

set position

U.L. (Ultra Low)

Room temp.

<

Set temp.

OFF

Room temp.

>

Set temp.

S.L (Super Low)

Fig. 7-10-1

(2) As soon as the defrost operation starts, the indoor

fan stops.

The microprocessor detects the indoor heat exchanger
temperature so as to prevent freezing up the indoor
heat exchanger.

Control is performed as shown in Fig. 7-9-1.

Heat exchanger
temperature

(˚C)

7
5

Compressor

Less than 5˚C continues

Outdoor fan

ON

for 5 minutes

OFF

Fig. 7-9-1

– 17 –

7-11. Defrost Operation

minutes40minutes40minutes40minutes

40

Max 6 minutes 10 minutes

1 cycle

Heating

Heating

Heating

Heating

Defrost

Defrost

Defrost

Defrost

(

)

During the heating operation, the outdoor heat
exchanger temperature goes down and sometimes it
is frozen.

In this case, the air conditioner stops the heating
operation and starts the defrost operation to melt ice.

7-11-1. Condition to Start the Defrost

Operation

The defrost operation starts whichever below
conditions are specified.

(1) When the cumulative compressor operation time

is longer than 40 or 90 minutes and difference
between the indoor heat exchanger temperature
and the room temperature is less than the
specified value. (This value is decided by the
microprocessor.) (Control e xample is shown in Fig.
7-11-1. In case of B or C, the defrost operation
starts.)

(2) When the current limit control or the high

temperature limit control is performed for total of
90 minutes.

(˚C)

D

19

Fig. 7-11-2

<In case of C>

(1) The heating operation is performed for at least 90

minutes.

(2) The defrost operation time is 10 minutes.

7-11-3. Ending Condition at Defrost

Operation

(1) When the compressor current becomes 7.5A or

more during defrost operation, the defrost opera­tion stops and the heat operation restarts. (The
current sensor detects the compressor current.)

(2) The defrost operation continues for at most 6

minutes or 10 minutes.

10

Indoor heat exchanger temp.

–Room temp.

A

40 90

B

Fig. 7-11-1 (Indoor fan speed : M)

7-11-2. Defrost Operation Time Control

<In case of B>

(1) The heating operation is performed for at least 40

minutes.

(2) The maximum defrost operation time is 6 minutes.

The defrost operation time for the 4th cycle is 10
minutes. (When the outdoor temperature is very
low, however, the defrost operation time is 10
minutes.)

C

min.

Cumulative
compressor
operation time

– 18 –

DEFROST LAMP :

• During defrost operation, the PRE-DEF. lamp
is on and the indoor and outdoor fans are off.

• The compressor start protection timer is inter­locked with the PRE-DEF. lamp. So the PRE­DEF. lamp is off (the fans stop) f or about 3 min­utes after the START/STOP button is turned
on. When the compressor is turned on, the
PRE-DEF. lamp comes on. After the heat ex­changer is preheated to about 30°C or higher,
the PRE-DEF. lamp goes off, and the indoor f an
starts.

7-12. Auto Restart Function

This unit is equipped with an Automatic restarting
facility which allows the unit to restart and resume the
set operating conditions in the event of a power supply
shutdown without the use of the hand control.

The operation will resume without warning three
minutes after the power is restored.

The Auto Restart function is set not to work on
shipment from the factory, and so it is necessary to
set it to function as required.

• When the system is stand-by (not running)

7-12-1. How to Set the Auto Restart

To set the Auto Restart function, proceed as follows:
Access the TEMPORARY button located in the lower

right hand corner beneath the hinged front panel of
the indoor unit (please refer to section on PARTS
NAME). The power supply to the unit must be on ­the function will not be set if the power is off.

To enable the Auto Restart function, press the
TEMPORARY button contin uously f or three seconds.

The unit will acknowledge the setting and beep three
times. The system will now restart automatically.

The above A uto Restart settings can be carried out:

OPERATION

Press the TEMPORARY button
continuously more than three
seconds.

0

TEMPORARY

• When the system is operating

OPERATION

Press the TEMPORARY button
continuously more than three
seconds.

0

TEMPORARY

MOTION

Stand-by

↓

The system starts to operate. The green light will be lit.

↓ about three seconds after

3S

The unit beeps three times. The orange light will be lit.

↓

The system is operating. The orange light is lighting.
If the system is not required to run at this time, press the TEMPORARY

button once more or use the remote control and the unit will stop.

MOTION

Operating The green light is lit.

↓

The system stops to operate. The green light is turned off.

↓ about three seconds after

3S

The unit beeps three times.

↓

The system stops.
If the system is not required to stop at this time, use the remote control

and to restart.

During subsequent operation, the orange light is lit.

• The Auto Restart function will not accept an
instruction if timer operation with the remote control
is selected.

(Please refer to the section on setting the timer or
setting the louver.)

• During louver swing (A UTO) oper ation, after restart
by the Auto Restart function the louver swing stops.

– 19 –

7-12-2. How to Cancel the Auto Restart

To cancel the Auto Restart function, proceed as
follows:

Repeat the setting procedure: the unit will
acknowledge the instruction and bleep three times.

• When the system is stand-by (not running)

The system will now be required to manually restart
with the remote control after the main supply is turned
off.

Cancellation is carried out:

OPERATION

Press the TEMPORARY button
continuously more than three
seconds.

0

TEMPORARY

• When the system is operating

OPERATION

Press the TEMPORARY button
continuously more than three
seconds.

0

TEMPORARY

MOTION

Stand-by

↓

The system starts to operate. The orange light will be lit.

↓ about three seconds after

3S

The unit beeps three times. The green light will be lit.

↓

The system is operating.
If the system is not required to run at this time, press the TEMPORARY

button once more or use the remote control and the unit will stop.

MOTION

Operating The orange light is lit.

↓

The system stops to operate. The orange light is turned off.

↓ about three seconds after

3S

The unit beeps three times.

↓

The system stops.
If the system is not required to stop at this time, use the remote control

and to restart.

During subsequent operation, the green light is lighting.

7-12-3. In Case of Power Failure during the

Timer Operation

(1) If ON-TIMER operation is reserved with setting of

Auto Restart operation, it is cancelled with power
failure. (The OPERATION lamp on the main unit
goes on and off to inform of power failure.) In that
case, try to reserve ON-TIMER operation once
again.

(2) If OFF-TIMER operation is reserved without

setting of Auto Restart operation, the reservation
is cancelled with power failure. (The OPERA TION
lamp on the main unit goes on and off to inform of
power failure.) In that case, try to reserve OFF­TIMER operation. When Auto Restart operation
is set, OFF-TIMER reservation is also cancelled
with power failure.

– 20 –

8. INSTALLATION PROCEDURE

8-1. Safety Cautions

For general public use

Power supply cord of parts of appliance for Outdoor use shall be more than polychloroprene sheathed flexible
cord (design H05 RN-F), or cord designation 245 IEC 57.

CAUTION

TO DISCONNECT THE APPLIANCE FROM THE MAINS SUPPLY.
This appliance must be connected to the mains 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 soc ket in order to disconnect the appliance
completely from the mains.

DANGER

` FOR USE BY QUALIFIED PERSONS ONLY.
` TURN OFF MAIN POWER SUPPLY AND BREAKER BEFORE ATTEMPTING ANY ELECTRICAL WORK.

MAKE SURE ALL POWER SWITCHES AND BREAKER TURN OFF. FAILURE TO DO S O MAY CAUSE
ELECTRICAL SHOCK.

` CONNECT THE CONNECTING CABLE CORRECTLY. IF THE CONNECTING CABLE IS CONNECTED BY

WRONG WAY, ELECTRIC PARTS MAY BE DAMAGED.
` CHECK THE EARTH WIRE IS NOT BR OKEN OR DISCONNECTED BEFORE INSTALLATION.
` DO NOT INSTALL NEAR CONCENTRATIONS OF COMBUSTIBLE GAS OF GAS VAPORS.

FAILURE TO FOLLOW THIS INSTR UCTION CAN RESULT IN FIRE OR EXPLOSION.
` TO PREVENT OVERHEATING THE INDOOR UNIT AND CAUSING A FIRE HAZARD, PLACE THE UNIT

WELL AWAY (MORE THAN 2M.) FROM HEAT SOURCES SUCH AS RADIATORS, HEAT RESISTORS,

FURNACE, STOVES, ETC..
` WHEN MOVING THE AIR-CONDITIONER FOR INSTALLING IT IN ANOTHER PLACE AGAIN, BE VERY

CAREFUL NOT TO GET THE SPECIFIED REFRIGERANT (R-22) 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 of by by-passing 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.

And make sure the equipment to be earthed.

• Appliance shall be installed in accordance with national wiring requlations.

If you detect any damage, do not install the unit. Contact your Toshiba dealer immediately.

– 21 –

CAUTION

• Exposure of unit or water or other moisture before installation will result in an electrical short.

Do not store 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 unit or where noise and discharged air might disturb user’s neighbors.

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

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

instructions for proper installation.

UK Plugs and Sockets etc (Safety) Regulations 1994

SI Number 1768

With regard to Schedule 3, Item 7 of the above UK Regulations, this appliance must be permanently connected
to the fixed wiring of the main electrical supply by means other than the use of an approv ed 13 Amp plug-top
as outlined in the Regulations.

Electrical work must be carried by suitably qualified persons and in accordance with all relevant safety standards
and codes of practice.

We recommend that the power supply f or this appliance is derived from a suitab ly protected dedicated circuit.

(for U.K. only)

For to comply with the specification 61000-3-3 the local power authority has to be conducted for permit of
operation. The installation condition has to be done as following :

• Installation only by authorized installer

• This product has to be connected to the mains supply via a separate connection to the main distribution box

(circuit breaker box).

– 22 –

8-2. Installation Diagram of Indoor and Outdoor Units

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

For the rear and left piping

Front cabinet

Front panel

(Attach to the back side.)

11
Filter
frame

9 Deodorizing
filter

10 Purifying
filter

3 Clip anchorClip anchor

120 mm or more

Air filter

(Attach to the back side.)

2 Wireless
remote
control

Hook

Hook

6 Pan head
wood screw

4 Remote control
holder

66 mm or more

Hook

8 Mounting screw

1 Installation
plate

120 mm

or more

5 Shield pipe

Wall

Insert the remote control holder
cushion between the indoor
unit and wall, and lift indoor
unit to make work easier.

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.

Right

100 mm or more

Before install the wireless
remote control

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

Wireless remote control

2

7

Batteries

Cover

400 mm or more

Electric parts
cover

45 mm or more

600 mm or more

600 mm or more

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

– 23 –

Extension
drain hose
(Option:
RB-821SW)

Rear

Bottom

Rear left

Left

Insulation of refrigerant pipes
insulates the pipes separately,
not together.

6 mm thick heat resisting
polyethylene foam

8-3. Installation

8-3-1. Optional Parts

Part

code

Parts name

Q’ty

<Drainage>

Bottom plate

ø25

12

Drain nipple

Refrigerant piping

A

Liquid side : ø6.35 mm
Gas side : ø9.52 mm

Pipe insulating material

B

(polyethylene foam, 6 mm thick)

C

Putty, PVC tapes

<Anchor bolt arrangement of outdoor unit>

600mm

Air inlet

111mm

30mm

230mm

Drain nipple

12

Air outlet

Each

one

1

Each

one

Drain hose sold
separately or one on the
market.

Fig 8-3-2

• Install the provided drain nipple in the hole of the
bottom plate of the outdoor unit. (See the above
figure.)

• Perform proper drainage processing using a drain
hose sold separately or one on the market. (Inner
diameter : 16 mm)

• Do not use an ordinary hose on the market,
because it tends to get flat and as a result, it
prevents water from draining.

Fig 8-3-1 Air outlet

• Secure the outdoor unit with the anchor bolts if the
unit is likely to be exposed to a strong wind.

• Use ø8 or ø10 anchor bolts.

• If it is necessary to drain the defrost water from
the outdoor unit, attach

drain nipple to the

12

bottom plate of the outdoor unit before installing it.
The drain nipple is located as shown above.

– 24 –

8-3-2. Kit Parts

Parts with an asterisk (*) are packaged with the outdoor unit.

Part

No.

1

2

Name of parts

Q’ty

Installation plate x 1

Part

No.

5

6

Name of parts

Q’ty

Shield pipe x 1

Part

No.

9

10

Name of parts

Q’ty

Deodorizing filter x 1

Pan head wood screw

Wireless remote control x 1

3

Clip anchor x 6

4 8

Remote control holder x 1

ø3.1 x 16l x 2

7

Batteries x 2

Mounting screw ø4 x 25l x 6

Purifying filter x 1

11

Filter frame x 2

12

Drain nipple* x 1

Others This model is not equipped with an extension drain hose.

Name

Installation manual

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

Owner’s manual

– 25 –

8-4. Indoor Unit

t Installation place

• A place which provides the spaces around the
indoor unit as shown in the diagram in section 8-2.

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

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

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

8-4-1. Cutting a Hole and Mounting

Installation Plate

<Cutting a hole>

When installing the refrigerant pipes from the rear

CAUTION

• Direct sunlight to the indoor unit wireless
receiver should be avoided.

• The microprocessor in the indoor unit should
not be too close to r-f 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 remote
control.

• 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.

The center of the piping slot

The center of the pipe
hole is the above arrow.

is the above arrow.

Pipe hole

80mm

65mm

40.5

mm

Fig. 8-4-2

(1) After determining the pipe hole position with the

mounting plate (80 mm →), drill the pipe hole (ø65
mm) at a slight downward slant to the outdoor side.

NOTE :

• When drilling the 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.

Anchor bolt hole

7m

75˚

(Side view) Indoor unit

Reception
range

(Top view)

Remote

control

Fig. 8-4-1

Indoor unit

Reception
range

*:Axial distance

5m

45˚

45˚

Remote
control

5m

*7m

– 26 –

65.5mm
Pipe

hole

Indoor unit

Thread

Weight

Fig. 8-4-3

8

Mounting
screw

Pipe hole

65.5mm

1

Installation
plate

<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) Install the installation plate horizontally in the wall.
(3) To mount the installation plate on a concrete wall

with anchor bolts, utilize the anchor bolt holes as

shown in the above figure.

CAUTION

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

8-4-2. 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.

Maximum

Model

RAS­10SKH-E/
10SAH-E

RAS­10SKHX/
10SAHX

Power source

50Hz

*220/230/240V~

Single-phase

running

current

* No adjustment is necessary .

7.5 A

Plug
socket
& fuse

rating

15 A

Wiring

1mm2 or

more

Anchor bolt

Projection
15mm
or less

CAUTION

Installation plate
(Keep horizontal direction)

5mm dia, hole

Clip anchor

3

Mounting screw ø4 x 25

8

Fig. 8-4-4

CAUTION

• Use power specified in above table.

• This appliance can be connected to the mains
in either of the following two ways.

(1) Connecting the power cord to the main power

supply provided with a circuit breaker or switch
with a contact of 3 mm or more.

In this case, an approved circuit breaker or
switch must be used.

(2) Attaching a plug to the power cord and pluging

it in to the wall outlet.
In this case, an approved power cord and plug

must be used.

NOTE :

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

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

3

mounting screws.

NOTE :

• Install the installation plate using 4 to 6 pieces of
mounting screw securing four corners with screws.

8

– 27 –

8-4-3. Wiring Connection

WARNING

Taking out the power cord

To plug the cable in the plug receptacle, take the
following precaution.

THIS APPLIANCE MUST BE EARTHED.

IMPORTANT

THE WIRES IN THIS MAINS LEAD ARE COLORED
IN ACCORDANCE WITH THE FOLLOWING CODE:

L

: Brown

N

: Blue
: Green and Yellow

-LIVE

-NEUTRAL

-EARTH

L
N

Fig. 8-4-5

As the colors of the flexible cord of this appliance may
not correspond with the colored markings, to identify
terminals in your plug, as follows:

Connect BROWN colored core to plug terminal marked
letter "L".

Connect BLUE colored core to plug terminal marked
letter "N".

Connect GREEN AND YELLOW colored core to plug
terminal marked Earth Symbol " ".

<How to remove the front cabinet>

4

4

Slitted portion

• Cut off the slitted portion in the side f ace of the
rear panel to take out the power cord. After
this, remove burrs, sharp edges, etc., to
smooth the cut face.

<How to connect the power cord>
For the air conditioner that has no power cord,

connect a power cord to it as mentioned below.

• After removing the front cabinet, remove the
terminal cover and the cord clamp.

• Connect and secure the power supply cord and
secure the cord clamp and the terminal cover.

• Cut the rear panel following the cutting mark and
put the power supply cord through the notch.

• Be sure to smooth out the notch with a file, etc.

Terminal block

Power supply
cord

L

N

Cord clamp

Terminal cover

Screw

2

1

3

Vertical air flow louver.

1

2

Fig. 8-4-6

How to open the screw cap

• Place your finger on the lower part and push
up to open the screw cap.

(1) Open the screw caps and remove the two screws

securing the front cabinet.
(2) Close the screw caps as behind.
(3) Open the vertical airflow louver horizontally by

hand.
(4) Slightly open the lower part of the front cabinet

then pull the upper part of the front cabinet toward

you to remove it from the rear plate.

– 28 –

Earth line

Fig. 8-4-7

<Stripping length of power cord>

30mm

10mm

L

N

10mm

40mm

NOTE :

• Use standard wire only.

• Wire type: More than H05-RNF

Fig. 8-4-8

Screw

Screw

Earth line

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

without removing of the front panel.

(1) Remove the front panel.

Fully open the front panel. Disengage the support

arm located in the upper center while pushing its

handle leftwards, and then remove the front panel

toward you.
(2) Remove the terminal cover and cord clamp.
(3) Insert the connecting cable (according to local

codes) into pipe hole on the wall.
(4) Take out the connecting cable through the cable

slot on the rear panel so that it is exploded by

about 15 cm long in the front side.
(5) Insert the connecting cable fully into the terminal

block and secure it by screw tightly.
(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 and front panel on the indoor

unit.

CAUTION

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

• Check local electrical codes and also any
specific wiring instructions or limitation.

Terminal block

Connecting
cable

about 15cm

Terminal
cover

Screw

Cord
clamp

Earth
line

<Stripping length of connecting cable>

50mm

10mm

4
3
2
1

10mm

40mm

Earth line

For a five conductor cable

NOTE :

• Use stranded wire only.

• Wire type:More than H05 RN-F

Fig. 8-4-10

<How to install the front cabinet on the indoor
unit>

Install the front cabinet through the opposite order of
"How to remove the front cabinet".

When the panel is removed and mounted again, take
the following actions:

After fastening the two screws, one each at the left
and right of the air outlet, be sure to push the upper
center1right end2, left end3and the lower
center4of the air outlet, and confirm that no gap is
left between the front cabinet and the rear plate.

• If cooling (dry) operation is made without
pushing the air outlet, dew can be deposited
on the front cabinet surface. In addition a gap
between the front cabinet and the rear plate
will become wider, spoiling the appearance.

Push Push

3

1

Push

2

Screw

Screw

Fig. 8-4-9

Connecting cable

4

Push

Fig. 8-4-11

– 29 –

8-4-4. Piping and Drain Hose Installation

)

Indoor unit

Connecting

cable
Installation
plate

Auxiliary
pipes

To connect pipe after installation of unit (figure)

<In case of rightward piping>

• After scribing slits of the front panel and the rear
panel by a knife or a marking-off pin, cut them by a
pair of nippers or the like.

Slit (front panel)

Slit (rear panel

Fig. 8-4-12

<In case of downward piping>

• After scribing the slit of the front panel and slit in
the lower part of the rear panel by a knife or a
marking-off pin, cut them by a pair of nippers or
the like.

(To the forefront of flare)

196mm

Side of liquid flow

96mm

Side of gas flow

Outward form of indoor unit

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

43mm

80˚

Use the handle of screwdriver,etc.

Fig. 8-4-14

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 auxiliary pipes
and wrap the facing tape around them.

Slit (front panel)

Slit (rear panel)

Fig. 8-4-13

<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 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 f acing tape tightly . In case of leftward
piping and rear-leftward piping, bind the
auxiliary pipes (two) only with facing tape.

• 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.

– 30 –

8-4-5. Indoor Unit Installation

(1) Pass the pipe through the hole in the wall, and

hook the indoor unit on the installation plate at the
upper hooks.

(2) Swing the indoor unit to right and left to confirm

that it is firmly hooked up on the installation plate.

(3) While pressing the indoor unit onto the wall by the

lower part, hook it up on the installation plate by
the lower part. Pull the indoor unit toward you by
the lower part to confirm that it is firmly hooked up
on the installation plate.

(1)

(2)

Hook

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

Hook here

Installation

1

plate

Fig. 8-4-15

Push

8-4-6. Drainage

(1) Run the drain hose sloping downwards.

NOTE :

• Hole should be made at a slight downwrd slant to
the outdoor side.

Do not rise the drain hose.

50 mm
or more

Do not put the
drain hose end
into water.

Fig. 8-4-17

(2) Put water in the drain pan and make sure that the

water is drained outdoors.

(3) When connecting extension drain hose, insulate

the connecting part of extension drain hose with

shield pipe.

5

5

Shield pipe

Do not form the drain hose
into the wared shape.

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

Push Push

Fig. 8-4-16

Drain hose

Inside the room

Extension drain hose

Fig. 8-4-18

CAUTION

Arrange the drain pipe for proper drainage from
the unit.

Improper drainage can result in damage to
property.

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

– 31 –

Space for pipes

Fig. 8-4-19

8-5. Outdoor Unit

t Installation place

• A place which provides the spaces around the
outdoor unit as shown in the diagram in page 23.

• 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 to
10 m.

• An allowable head level is up to 5 m.

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

CAUTION

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 coast.

• A place full of sulfide gas.

• A place where high-frequency waves are likely
to be generated as from radio equipment,
welders, and medical equipment.

CAUTION

(1) Install the outdoor unit without anything

blodking the air discharging.

(2) When the outdoor unit is installed in a place

exposed always to a strong wind like a coast
or on a high story of a building, secure the
normal fan operation using a duct or a wind
shield.

(3) Specially in windy area, install the unit to

prevent the admission of wind.

Strong
wind

Fig. 8-5-1

– 32 –

8-5-1. Refrigerant Piping Connection

(

)

<Flaring>

(1) Cut the pipe with a pipe cutter.

8-5-2. Vacuum Pumping

AIR PURGE
Evacuate the air in the connecting pipes and in
the indoor unit using vacuum pump.

90˚

Obliquity Roughness Warp

Fig. 8-5-2

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

A (mm)

Imperial

1.3 mm

1.6 mm

Rigid

0.7 mm

1.0 mm

Die Pipe

A

Outer
diam.

6.35 mm

9.52 mm

Fig. 8-5-3

<Tightening connection>

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

Do not use the refrigerant in the outdoor unit.
For details, see the manual of vacuum pump.

<Use of vacuum pump>

(1) Connect the charge hose (A) from the manifold

valve to the charge inlet of the gas side packed
valve.

(2) Connect the charge hose (B) to the port of vacuum

pump.

(3) Open fully the low pressure side handle of the

manifold valve.
(4) Operate the vacuum pump.
(5) Close the low pressure side handle of manifold

valve after vacuumizing and stop the vacuum

pump.

Continue vacuumizing more than 15 minutes and
check the pressure gauge indicates –76 cmHg.

CAUTION

• Do not apply excess torque. Otherwise, the
nut may crack depending on the installation
conditions.

(Unit : N·m)

Outer diam.

6.35 mm

9.52 mm

Half union or packed valve

Externally
threaded
side

Use a wrench
to secure.

Tightening torque

15.7 (1.6 kgf·m)

29.4 (3.0 kgf·m)

Fig. 8-5-4

Use a torque wrench
to tighten.

Additional

tightening torque

19.6 (2.0 kgf·m)

34.3 (3.5 kgf·m)

Flare nut

Internally
threaded
side

(6) Open the stems of packed valves A and B all the

way.

(7) Securely tighten the stem cap to each of the

packed valve stems.

Indoor unit

Pressure gage

Low pressure side handle

Charge hose (A)

Outdoor unit

Gas
(ø9.52)

C

A

Manifold valve

Service port

High pressure
side handle

Lo Hi

Charge
hose (B)

VP

D

B

Liquid

ø6.35

Fig. 8-5-5

Packed
valve

– 33 –

CAUTION

• KEEP IMPORTANT 4 POINTS FOR INSTAL­LATION (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)

<Packed Valve Handling Precautions>

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

• Securely tighten the valve stem cap with the
wrench or like.

• V alve stem cap tightening torque is as follows;
Gas pipes side (ø9.52) : 29.4 N•m (3.0 kgf•m)
Liquid pipe side (ø6.35) : 16.2 N•m (1.7 kgf•m)

<A5 mm hexagon wrench is required.>

Flare nut

8-5-3. Wiring Connection

(1) Remove the electric parts cover from the outdoor

unit. (1 screw)

(2) Connect the connecting cable to the terminals as

identified with their respective matched numbers
on the terminal block of indoor and outdoor units.

(Strip the sheath of connecting cable with following
stripping length to and insert into the terminal
block.)

(3) When connecting the connecting cable to 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) with water

coming in the outdoor unit. Process them so that
they do not touch any electrical or metal parts.

<Stripping length of connecting cable>

Terminal block

70mm

10mm

4
3
2
1

Earth line

10mm

60mm

Terminal
screw

Connecting
cable

1234

Screw

Cord clamp

Valve body

Valve stem

Stopper

Valve stem cap

Fig. 8-5-6

5mm

Fig. 8-5-7

CAUTION

• Wrong wiring connections may cause some
electrical parts to burn out.

• Be sure to comply with local code on running
the wire from the indoor unit to outdoor unit.

(size of wire and wiring method etc.)

• Every wire must be connected firmly.

NOTE :

• Wipe type : More than H05 RN-F

– 34 –

8-6. Others

8-6-1. Gas Leak Test

Flare nut connections (Indoor unit)

Flare nut connections (indoor unit)

8-6-3. Auto Restart Setting

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

C

D

Electric parts
cover

Flare nut
connections
(Outdoor unit)

B

Valve stem cap
connection

Valve stem cap
connection

A

Service cap
connection

Fig. 8-6-1

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

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 down 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 User's Manual.

8-6-2. Test Operation

To switch the TEST RUN (COOL) mode, press
TEMPORARY button f or 10 sec. (The beeper will make
a short beep.)

TEMPORARY

Fig. 8-6-2

– 35 –

9. TROUBLESHOOTING CHART

TROUBLESHOOTING PROCEDURES :

• Following details of “What to be pre-checked first”, make sure of the basic items.

• When there is no trouble corresponding to above, check in detail the faulty parts following “How to judge
faulty parts by symptoms” later.

9-1. What to be Prechecked First

9-1-1. Power Supply Voltage

The line voltage must be A C 220/230/240V. If the line
voltage is not within this range, this air conditioner
may not work normally.

9-1-2. Incorrect Cable Connection between

Indoor and Outdoor Units

The indoor unit is connected to the outdoor unit with 5
cables. Make certain that the indoor and outdoor units
have been connected properly , with terminals assigned
the same numbers wired to each other. If the connec­tors are not connected as specified, the outdoor unit
will not operate normally, or OPERATION lamp and
TIMER lamp will flash (5Hz).

– 36 –

9-1-3. Misleading but Good Operations

(Program Controlled Operation)

The microcomputer performs the operations listed in
Table 9-1-1 to control the air conditioner . If a claim is
made on the operation, check whether it corresponds

Table 9-1-1

to the contents in the Table 9-1-1. If it does, it is an
indispensable operation for the control and mainte­nance of the air conditioner: it is not a failure of the
unit.

No.

1

2

3

4

5

6

Operation of air-conditioner

When the power plug or the power cord
of the indoor unit is inserted, the
OPERATION lamp on the setting
indication part flashes.

Fan speed remains unchanged in the dry
mode.

Room temperature is in the range under
which the compressor is turned off, but
the compressor will not stop.

The compressor will not switch on or off
even when the thermo control is operated
in the dry operation.

The PRE-DEF. lamp comes on when the
heating operation is started.

The outdoor fan stops once in the while
during the heating operation.

Description

The OPERATION lamp flashes, indicating that power is turned
on. If this happens , push the START/ST OP button once to cause
the lamp to stop flashing. A power outage also causes the lamp
to flash.

Fan speed is automatically controlled in the dry mode.

The compressor will not stop while the compressor on hold timer
(3-minutes timer) is actuated.

In the dry mode, the compressor goes on and off at regular
intervals, independent of the thermo control.

The PRE-DEF. lamp comes on during defrost operation and when
the indoor heat exchanger temperature is low when the heating
operation is started. At this time, the indoor fan is stopped to
prevent cold air from drifting into the room.

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

• When the compressor current is large, the outdoor fan may be
stopped by the current limit control operation.

7

Compressor does not work though room
temperature is in the range of turning the
compressor on.

8

During automatic operation, the
operation mode changes.

9

During automatic operation mode, the
fan only operation continues.

10

When the power is turned on, the
operation starts automatically .

Compressor does not work while the compressor restart delay
(3-min.) timer is active. The same is true after power is turned
on, as the time is still active.

After selection of the cooling and heating operation, the operation
mode is selected again when the compressor off mode continues
for 15 min. according to the room temperature.

When the room temperature is within setting temperature ± 1°C
the fan only mode is selected.

When the auto restart controlling is selected, the operation is
performed automatically in the previous operation mode after
the power supply has been turned on.

– 37 –

9-2. Primary Judgement of Trouble

Sources

9-2-1. Role of Indoor Unit Controller

The indoor unit controller receives the operation com­mands from the remote control and assumes the fol­lowing functions.

• Measurement of the draft air temperature of the
indoor heat exchanger by using the thermo sen­so r (TA).

• Louver motor control

• Control of the indoor fan motor operation

• Control of the LED display

• Control of the outdoor unit compressor, 4WAY­V A LVE and the outdoor fan motor.

Table 9-2-1

9-2-2. Display of Abnormalities and

Judgement of the Abnormal Spots

The indoor unit of this machine observes the opera­tion condition of the air conditioner and displays the
contents of the self-diagnosis as block displays on
the display panel of the indoor unit.

Block display

OPERATION display flashing (1 Hz)

A

OPERATION display flashing (5 Hz)

B

OPERATION display flashing (5 Hz)

C

OPERATION display flashing (5 Hz)

D

OPERATION display flashing (5 Hz)

E

OPERATION and TIMER display flashing

F

(5 Hz)
OPERATION, TIMER and PRE-DEF. display

G

flashing (5 Hz)

OPERATION, TIMER and PRE-DEF. display

H

flashing (5 Hz)

(1) Judgement from defective operation or abnormal operation

Table 9-2-2

Power failure (when power is ON)
Thermo sensor (TA) short/break
Heat exchanger sensor (TC) short/break
Indoor fan lock, abnormality of indoor fan
Indoor PC board failure
Wrong wiring of connecting cable

Thermal fuse is blown

• Gas shortage, other refrigerant cycle trouble

• Heat exchanger sensor open/break/short

• Overload relay trouble
Compressor trouble

Block display

Symptom

No reaction on
remote control
operation

The outdoor fan
does not rotate

Check

Turn off the power once, turn it on
again and try to operate the remote
control again.

The compressor operates.

The compressor does not operate.

– 38 –

Remote control is
not possible.

Remote control is
possible.

Primary judgement

The indoor part (including the
remote control) is defective.

OK.

The outdoor part is defective.
(outdoor fan motor)

The inside part is defective.

(2) Self-diagnosis with remote control

(

)

With the indoor unit control, self-diagnosis of pro­tective circuit action can be done by turning the
remote control operation into service mode, oper­ating the remote control, observing the remote
control indicators and checking whether TIMER
lamp flashes (5 Hz).

2) Selecting ordinary mode

Push the all clear button (ACL) on the rear bot­tom of the wireless remote control with a tip of
pencil for more than 3 seconds. Make sure
the operation mode display, wind volume dis­play, clock display and setting temperature dis­play are turned on and “ : ” of the clock display
is flashing.

Note :

• To perform this self-diagnosis, the remote
control with the service code of 43069666
is required.

<How to select remote control operation mode>

1) Selecting service mode

Push the switch button provided on rear bot­tom of the wireless remote control with a tip of
pencil for more than 3 seconds. Make sure
the setting temperature is displayed on

“ ”

the display and other display is turned off.

<Cautions when doing service>

1) After completion of servicing, always push the
all clear (ACL) button to return the operation
mode to the normal mode.

2) After completion of servicing by the check
code, turn off the power once and then turn on
the power to reset memorized contents of the
microcomputer to the initial status.

All clear button

Switch for selecting
service mode

ACL CLOCK

Rear bottom of remote control

Fig. 9-2-1

– 39 –

ACL

CLOCK

Rear bottom cover

<Self-diagnosis by check codes>

➞

”

“

”

“

➞

”

“

”

“

➞

”

“

”

“

➞

”

“

”

“

1) The self-diagnosis by the check codes is con­ducted under the block displays of item B-H in
Table 9-2-1.

2) Remote control key operation under the ser­vice mode is conducted by ON/OFF or TEMP.
The remote control display by each key op­eration is varied as shown below. Two digit
number is displayed in a hexadecimal num­ber.

3) The self-diagnosis by the check codes is con­ducted with procedures shown below .

a) Enter the service mode and make sure the

off timer display of the remote control shows
.

“ ”

b) Operate the “ON/OFF” key and make sure

the timer lamp on the display section is
flashing (5 Hz).

Table 9-2-3

c) At the same time, also make sure the op-

eration lamp is also flashing. This shows
that the protection circuit on the indoor PC
board is working.

d) Operate the TEMP. key and mak e sure

the remote control display shows and
flashing of the operation lamp. If the op­eration lamp is flashing, it shows the pro­tection circuits for connecting cable is work­ing or thermal fuse is blown.

e) In the same way, operate the TEMP.

key so that the display is increased one
by one to continue checks by the self-di­agnosis as shown in the next table. From

“ ”

up to check operations of

protection circuits for each block, and

“ ”

to check operations of the

typical protection circuits.

“ ”

“ ”

“ ”

Operating key

ON/OFF

TEMP. (Up)

TEMP. (Down)

“AUTO ” LOUVER

“SET” LOUVER

Indication after operation

“

1 is added to data before operation.
(Example)

1 is subtracted from data before operation.
(Example)

10 is subtracted from data before operation.
(Example)

Data before operation is directly transferred.
(Example)

”

– 40 –

Table 9-2-4

Block level

Check

code

Block

Indoor PC
board

Check

code

Diagnosis function

Symptom

Thermo sensor
short/break.

Heat exchanger
sensor short/break.

Indoor fan lock,
abnormality of
indoor fan.

Air

Conditioner

status

Continued
operation

Continued
operation

All off

Condition

Indicated when
detected abnormal

Indicated when
detected abnormal

Indicated when
detected abnormal

Judgment and action

1. Check thermo sensor.

2. If it is OK, check PC board.

1. Check heat exchanger
sensor.

2. If it is OK, check PC board.

1. Disconnect the power plug
from AC outlet, and pull out
the connector (CN10) for the
motor, then connect the plug
of AC power cord again and
turn the power on.

2. Check the voltage between
pin 1 and 2 of the connector
(CN10).

3. If the output voltage is 35V,
PC board is OK, check
motor.

Cable
connection/
Thermal
fuse
Refrigerant
system

Abnormality of
other indoor unit PC
board.

1) Wrong wiring or
disconnection of
connective
cable.

2) Thermal fuse cut
off.

1) Gas shortage.
(gas leak)

2) Other refrigerant
cycle trouble.

3) Heat exchanger
sensor off/break/
short.

4) Overload relay or
thermostat for
compressor
break.

All off

All off

All off

Indicated when
detected abnormal

Indicated when
detected abnormal

Indicated when
detected abnormal

Replace PC board.

1. Check connective cable
correct if wiring is wrong.

2. Check thermal fuse and
Terminal blocks.

3. If it is OK, check PC board.

1. Check gas quantity.
(check gas leakage)

2. If it is OK, check heat
exchanger sensor.

3. If heat exchenger sensor is
OK. check overload relay and
thermostat for compressor.

4. If overload relay and
themostat for compressor
are OK, check refrigerant
cycle.

5. If refrigerant cycle is OK,
check PC board.

Compressor break
down.

Contents detected by the check codes “ ” to “ ” are stored in memory of the microcomputer even if the power
supply is turned off. Therefore, contents of operations in the past are all displayed.

All off

Indicated when
detected abnormal

1. Check compressor.

2. If it is OK, check PC board.

– 41 –

9-3. Troubleshooting Flowcharts

9-3-1. Power can not be Turned on (No Operation at All)

<Preliminary checks>

(1) Is the supply voltage normal?
(2) Is the connection to the AC output OK.?

Shut off the power supply
from AC outlet once and
turn it on after 5 seconds.

NO

Does the OPERATION

lamp flash?

YES

Operation

Check Items

Main cause

Countermeasure

Symptom

Does the fuse

Does the thermal

(Under PF. Terminal)

Is the indication voltage

NO

(DC12V or 5V) of main

PC board correct?

Is the voltage

across C02 measured

DC310V~340V?

YES

Does the power turn

on by pushing the

[START/STOP] button

of the remote control?

YES

(F01) blow?

NO

fuse blow?

NO

YES

Refer to the paragraph

NO

"Pre-check", or defective circuit
before power PC board block.

YES

YES

(No problem)

Parts (R21, R109, SG01,

C15, C01, DB01, C02,

IC01, T01) are defective.

Wrong wiring of

AC cord or connecting

cable is defective.

Does the transmission

indicator of remote

control flash normally and

transmit certainly?

YES

PC board

is defective.

NONO

Remote control

is defective.

Replace the
remote control.

Replace the
thermal fuse set.
Check connection.

Replace the main
PC board.

Is the secondary

voltage of SW trans-

former (T01) measured

DC35V, DC12V,

and DC7V ?

YES

Be sure to disconnect the motor connector CN10 after shut off the power supply, or it will be a cause of

*

Shut off the power
supply once, and turn

NO

it on again after dis­connecting the motor
connector CN10

Is the secondary

voltage of SW

transformer measured

.

*

DC35V, DC12V,

and DC7V?

YES

NO

SW transformer

(T01) or IC (IC01)

for power supply

is defective.

Replace the main
PC board.

Motor is defective.

damage of the motor.

– 42 –

9-3-2. Power can not be Turned on after Replacing Indoor PC Board

<Checking Procedure>

Connect the AC plug.

Does the OPERATION

lamp flash?

YES

Black

1 2 3 4

Indoor
terminal
block

NO

White

Blue

N L

Power
terminal
block

9-3-3. Outdoor Unit does not Operate

Is it wired as shown

in Figure below?

YES

Brown

C02

RY01

PC board

NO

RY02

Return the wiring of the
power relay is returned to
the normal procedure.

To the paragraph of
“No Power turns on”.

Double winding

T02

Shut off the power supply
from AC outlet once and
turn it on after 5 seconds.

Does the OPERATION lamp flash?

YES

Does the power turn on by

pushing the [START/STOP] button

of the remote control?

YES

Is AC220/230/240V

supplied between terminal block

1 - 2 , 3 - 2

Is cable connection

between indoor and outdoor

units correct?

Check items as following procedure
in 9-3-4, 9-3-5, 9-3-6.

1, 4 - 2 ?

*

YES

YES

1 Only Heating mode

*

NO

NO

NO

NO

See "Power can not be turned on".

See "Power can not be turned on".

Relays (RY01, RY02, RY03, RY04)
or IC31 or IC30 is failure.

Correct cabling between
indoor and outdoor units.

Replace the
PC board.

– 43 –

9-3-4. Only Compressor does not Operate

Shut off the power supply
from AC outlet once and
turn it on after 5 seconds.

Does the OPERATION lamp flash?

YES

Does the power turn on by

pushing the [START/STOP] button

of the remote control?

YES

Is the voltage across the terminal

( 1 - 2 ) 220/230/240 VAC?

YES

Is cable connection between indoor

and outdoor units correct?

YES

Is the voltage across the terminal

( 1 - 2 ) 220/230/240 VAC?

YES

Are all the cords for compressor normal?

YES

NO

NO

NO

NO

NO

NO

See "Power can not be turned on".

See "Power can not be turned on".

Relays (RY01, RY02)
or IC31 or IC30 is failure.

Correct cabling between indoor
and outdoor units.

Cables between indoor and
outdoor units are defective.

Re-wire or replace the defective cords.

Replace the
PC board.

Is the compressor motor winding normal?

(Check the winding resistor.)

YES

Is the capacitor for compressor normal?

YES

Is the overload relay normal?

YES

Does the compressor start?

YES

Compressor starts but

it stops after a while?

YES

Is the gas quantity normal?

(Check the pressure)

YES

Compressor is defective

NO

NO

NO

NO

NO

Compressor is defective.

Capacitor is defective.

Overload relay is defective.

Compressor is defective.

Gas shortage (Gas leakage)

– 44 –

9-3-5. Only Outdoor Fan does not Operate

Shut off the power supply
from AC outlet once and
turn it on after 5 seconds.

Does the OPERATION lamp flash?

YES

Does the power turn on by

pushing the [START/STOP] button

of the remote control?

YES

Is the voltage across the terminal

( 2 - 4 ) 220/230/240 VAC?

YES

Is cable connection between indoor

and outdoor units correct?

YES

Is the voltage across the terminal

( 2 - 4 ) 220/230/240 VAC?

YES

Are all the cords for outdoor

fan motor normal?

YES

NO

NO

NO

NO

NO

NO

See "Power can not be turned on".

See "Power can not be turned on".

Relays (RY02, RY03)
or IC31 or IC30 is failure.

Correct cabling between indoor
and outdoor units.

Cables between indoor and
outdoor units are defective.

Correct the wire or
replace the defective cords.

Replace the
PC board.

Is the outdoor fan motor winding normal?

(Check the winding resistance)

YES

Is the capacitor for compressor normal?

YES

Outdoor fan motor is defective.

NO

NO

Outdoor fan motor is defective.

Capacitor for outdoor
fan motor is defective.

– 45 –

9-3-6. Only 4-Way Valve does not Operate (During Heating Operation)

Shut off the power supply
from AC outlet once and
turn it on after 5 seconds.

Does the OPERATION lamp flash?

YES

Does the power turn on by

pushing the [START/STOP] button

of the remote control?

YES

Is the voltage across the terminal

( 2 - 3 ) 220/230/240 VAC?

YES

Is cable connection between indoor

and outdoor units correct?

YES

Is the voltage across the terminal

( 2 - 3 ) 220/230/240 VAC?

YES

Is the wiring of solenoid coil

for 4-way valve normal?

YES

NO

NO

NO

NO

NO

NO

See "Power can not be turned on".

See "Power can not be turned on".

Relays (RY02, RY04)
or IC31 or IC30 is failure.

Correct cabling between indoor
and outdoor units.

Cables between indoor and
outdoor units are defective.

Solenoid coil is defective.

Replace the
PC board.

4-way valve is defective.

– 46 –

9-3-7. Only the Indoor Fan does not Operate

< Preliminary checks >

Does it neither work in COOL or FAN ONLY operation?

< Check procedure >

Shut off the power
supply once.

Turn the power supply.

Does the fan

stop in no operating

status?

YES

Start the operation
with low fan setting
in cool operation.

Does the fan rotate?

YES

Change the setting of
cooling to high fan.

Does the fan speed

become higher?

YES

NO

NO

Control PC board is defective.

Is the voltage

NO

measured DC35V

between

and

Shut off the power supply.

Turn on the power supply.

Operation
stops

(DC+5V-0V) output between

(blue lead wire) and

lead wire) of the motor connector

(CN10) when rotating the cross

flow fan by hand in no operating

status ? (2 pulses/one turn)

1 (red lead wire, +)

2 (black lead wire, –)

of the motor connector

(CN10) ?

YES

Does the cross

flow fan rotate

normally?

YES

Is the rotation signal

YES

NO

2 (black

NO

Repair the
bearing of
the drain fan.

4

Replace the PC board.

Shut off the power supply,
and turn it on after
disconnecting the motor
connector (CN10)
the PC board.

Is the voltage of

DC35V measured

between 1 (red lead wire, +)

and 2 (black lead wire, –) of

the motor connector

(CN10) ?

NO

YES

*

from

NO

Replace the
PC board.

Normal

Be sure to disconnect the motor connector CN10 after shut off the power supply, or it will be a cause of

*

Replace the control
PC board.

Replace the
fan motor.

damage of the motor.

– 47 –

9-4. How to Check the Remote Control (Including the Indoor PC Board)

There is no beep from
the indoor unit.

Push the START/STOP button.

The operation lamp of
the air conditioner main
unit does not light.

Is there direct
sunlight on the
receptor of the
air conditioner?

YES

NO

Is there any

thyristor

fluorescent light

near by?

YES

NO

Does the transmission

YES

NO

Is operation

possible when setting

the temporary switch of the

air conditioner main unit to

"TEST RUN" or

"TEMPORARY AUTO"?

NO

possible when the

transmitter is moved

nearer to the infrared

signal receiver of the

indicator flash?

Is operation

air conditioner?

YES

Battery life

NO

Short-circuit the metal
terminal at the side of the
battery compartment
(all-clear terminal) with a pencil.
(wait about 10 seconds)

Push the START/
STOP button

Does the

transmission

indicator light?

YES

NO

Avoid direct
sunlight.

Keep the air

conditioner away

from thyristor

fluorescent light.

YES

Can any signal tone

be heard in a transistor

radio when transmitting

within 5cm distance

from the radio?

YES

PC Board is failure.

Replace

PC board.

After battery replacement,

Note:

shortcircuit the metal terminal at
the side of the battery compartment
(all-clear terminal) with a pencil.

– 48 –

NO

Replace the
batteries

NO

Normal

Is there any

beep and

operation?

YES

Remote control

is failure.

Replace remote
control.

9-4-1. How to Check the PC Board

(1) Operating precautions

1) When removing the front panel or the PC board,
be sure to shut off the power supply.

2) When removing the PC board, hold the edge
of the PC board and do not apply force to the
parts.

3) When connecting or disconnecting the connec­tors on the PC board, hold the whole housing.
Do not pull at the lead wire.

(2) Inspection procedures

1) When a PC board is judged to be defective,
check for disconnection, burning, or discolora­tion of the copper foil pattern or this PC board.

2) The PC board consists of the following 2 parts

a. Main PC board part:

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

b. Infrared rays receive and indication

parts:

Infrared rays receive unit and LED.

– 49 –

(3) Checking procedure

Table 9-4-1

No.

1

Shut off the power supply and
remove the PC board assembly
from the electronic parts base.

Remove the connecting cable from
the terminal block.

2

Remove the connector for the
motor, and turn the power on.

If the OPERATION lamp flashes
(0.5 sec. :ON, 0.5 sec. :OFF) when
the power turning on, the checking
points described as 1-5 of right
column are not necessary to
perform.

3

Make the operation status by
pushing once the START/STOP
button, except the status of [FAN
ONLY], [ON TIMER].

4

Start the operation with the system
which the time of the restart delay
timer is shortened.

5

Make the operation status by pressing
once the START/STOP button.

1.The time of the restart delay timer
is shortened.

2.Cool operation

3.Air volume [AUTO]

4. Make the setting temperature lower
enough than room temperature.

5.Continuous operation.

6

The status of No. 5 is continued,
and make the following condition.

1.Heat operation

2.Make the setting temperature
higher enough than room
temperature.

7

Turn the power on after connecting
the motor connector.
Start the operation with the following
condition.

1.Operation [Cooling]

2.Airflow [High fan]

3.Continuous operation

Procedure

Check Point (Symptom)

1.Is the fuse blown?

Voltage check

1.Between TP1 and TP2
(220/230/240V AC)

2.Between TP2 and pin 1 of CN04
(220/230/240V AC)

3.Between TP2 and pin 3 of CN04
(220/230/240V AC)

4.Between + and - of C02
(310 ~ 340V DC)

5.Between 35V and GND

6.Between 12V and GND

7.Between 5 V and GND

Voltage check

1. Voltage of relay coil. (DC 12V)
Between pin 10 of IC31 and GND
Between pin 11 of IC31 and GND

2. Between No. 1 and 2 of connecting
cable terminal block.

(220/230/240V AC)

1.All indicators light for 3 sec..

2. Indicators do not indicate normally
after approximate 3 sec..

1.Compressor does not operate.

2. OPERATION lamp flashes.

1.Compressor does not operate.

2. OPERATION lamp flashes.

1.The voltage of DC 35V is not
measured between the red and
black of the motor terminals.

2. Motor does not rotate.
(The key operation is accepted.)

3. The motor rotates, but it vibrates
too much.

Causes

1.* Application of shock voltage.
* Overcurrent by short-circuit of the

parts.

1.* AC power cord is defective.
* Poor contact of the terminal plate.
* Miss wiring of the power relay.

2.Fuse is defective.

3.Operation of the thermal fuse.

4.* Capacitor (C01, C15) is defective.
* Line filter (L01) is defective.
* Resistor (R01) is defective.
* Diode (DB01) is defective.

5.IC01, IC02, T01 are defective.

6.IC01, IC02, T01, F03 are defective.

7.IC01, IC02, T01, F02, Q29, IC03
are defective.

1.Breaking wire of the relay coil,
defective relay driver. (IC31)

2.Poor contact of relay.



Defective indicator, or poor



housing assembly. (CN13)



1.The temperature of the indoor heat
exchanger is abnomally lower.

2.Poor contact of the heat exchanger
sensor. (The connector is
disconnected.) (CN01)

3.Heat exchanger sensor, main PC
board are defective.
(Refer to Table 9-4-2 for the judgment
of defective resistance values.)

4.Main PC board is defective.

1.The temperature of the heat
exchanger is abnormally high.

2.The heat exchanger sensor
connector has short-circuit. (CN01)

3.The heat exchanger sensor is
defective.
(Refer to Table 9-4-2 for the judgment of
defective resistance values.)

4.PC board is defective.

1.Indoor fan motor is defective.
(Protecting operation on the PC
board.)

2. Poor contact of the motor
connector.

3.PC board is defective.

– 50 –

9-4-2. PC Board Layout

Top View

Bottom View

– 51 –

Table 9-4-2 Approximate value of the sensor (thermistor) resistance (TA, TC)

Timer short diode

Wireless remote control

(= kΩ)

Temperature

Sensor

Themo Sensor

0°C

35.8

9-4-3. How to Reduce the Operation Time of

the Anti-Restart Timer

• Attach the diode (1S1555 or equivalent) to the rivet
inside the unit through holes on the rear of the
wireless remote control unit.

• Push the START/STOP button to start operation
with the diode attached.

10°C

20.7

20°C

12.6

25°C

10.0

30°C

7.92

Fig. 9-4-1

– 52 –

10. PART REPLACEMENT

10-1. Indoor Unit (RAS-10SKH-E, RAS-10SKHX)

No.



Part name

Front panel

RemarksProcedure

1) After stopping the operation of the air conditioner, be
sure to turn off the circuit breaker or disconnect the
power plug from the AC wall socket.

2) Open the screw caps and remove the two screws
fixing the front panel.

3) Close the screw caps as they were.

4) Open the horizontal louver right below by your
finger.

5) Open the lower side of front panel until it touches
the horizontal louver, and remove it from the indoor
unit by turning it.

<To assemble the front panel>

1) Fix the two screws to secure the front panel.

2) Close the screw caps as they were.

3) Press four places where are the center, right end,
left end and lower portions of the air outlet.

4) Check the gap between the front panel and the main
unit.

If cooling or drying operation is performed without
pressing the center of the air outlet, the surface of
the front panel may be covered with frost and have
a waterdrop.

Electrical part



assembly

Drain-pan



assembly

1) Perform the process  above.

2) Remove the screw securing the shield metal plate.

3) Remove the electrical part cover by pressing the nail
located on upper portion of the electr ical par t cover.

4) Remove the drain guide.

5) Remove the screw securing to the end plate of the
heat exchanger.

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

7) After unhooking the electrical part base by pressing
the fixing nail located on its lower portion, draw the
electrical part base out toward you to remove it from
the main unit.

8) Pull the TC sensor out from the holder of the heat
exchanger.

9) Dress the connecting cable securely as shown in the
right illustration.

(Improper dressing will cause water leakage.)

1) Perform the process  above.

2) Remove the drain-pan by pressing the four hooks
downwards.

(Keep it with the drain hose.)

– 53 –

Part name

Procedure

RemarksNo.

Horizontal grille



Note:

The horizontal
grille can not be
removed without
removing the
louver motor.

Heat exchanger



Cross flow fan



1) Perform the process .

2) Remove the screw fixing the louver motor, and
remove the louver motor.

3) Remove the shaft of the horizontal grille from the
drain-pan.

1) Perform the process .

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

3) Unhook the hooks fixing the left side of the heat
exchanger and remove the screw fixing it, then
remove the right side of the end plate from the rib
fixing the main unit by sliding the heat exchanger
slightly to the right side.

1) Perform the process .

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

3) Remove the screw fixing the shaft bearing base.

4) Lift slightly up the left side of the heat exchanger,
and pull the shaft bearing base out left downwards.

Shaft bearing



Fan motor



When assembling it, fix it with the set screw on the
position where the gap between the rear plate surface
and the left end surface of the cross flow fan is 6 ~
7mm.

1) Perform the process  above.

2) Remove the shaft bearing from the shaft bearing base.
<Caution for assembling>

• If a part of the shaft bearing is protruded from the
housing, assemble it after pushing its portion into
the correct position in the housing.

1) Perform the process  above.

2) Perform the process

3) Remove the left and right motor bands.

4) Remove the fan motor after pulling the cross flow
fan out sliding it left and right.

-2) above.

– 54 –

10-2. Microcomputer (RAS-10SKH-E, RAS-10SKHX)

No.





Part name

Common
procedure

Thermal fuse
replacement

Procedure

1) Turn the power supply off to stop the operation of
air-conditioner, and disconnect the power cord from
the AC supply.

2) Remove the front panel.

• Remove the two fixing screws. (φ4 x 14 )

3) Remove the electrical part base.

1) Perform the process  above.

2) Remove terminal cover (Up), (Down).

3) Disconnect the terminal blocks connected with the
connecting cable, and the power cord from base E­parts by removing the screws.

4) Remove the thermal fuse (77°C) from base E-parts.

Remarks

Replace the thermal fuse, terminal
block, power cord, microcomputer
ass’y and the power supply PC
board ass’y.

– 55 –

10-3. Outdoor Unit (RAS-10SAH-E, RAS-10SAHX)

No.

Common



procedure

Capacitor for



compressor

Capacitor for fan



motor

Part name

Procedure

1) Stop the operation of air-conditioner, and disconnect
the power cord from the AC supply.

2) Remove E-parts cover.
(1- ST1T ø4 x 10 )

3) Remove the cord clamp (2- ST2T ø4 x 12 ) and
remove the connecting cable.

4) Remove the front cabinet. (7- ST1T ø4 x 10 with
nylon washer)

• Pull the front lower portion toward you, and remove
it pulling out upward.

1) Remove the fixing screw securing the capacitor
band.
(1- ST2T ø4 x 8 )

2) Remove the cable connected to the terminal.

1) Remove the fixing screw.
(1- ST2T ø4 x 8 )

2) Remove the cable connected to the terminal.

Remarks

Refer to [Electrical parts list and
location] in page 61.

Same as above.

Overload relay



1) Perform the process  above.

2) Remove terminal cover of compressor.

3) Remove OL holder and pull OL relay up.

4) Remove Fustons of leads.

– 56 –

11. CAUTIONS ON REPLACEMENT OF PC BOARD ASSEMBLY

RY01

C02

RY02

Brown

N L

Power
terminal
block

T02

PC board

Blue

White

Black

Double winding

1 2 3 4

Indoor
terminal
block

1. Set the switch (SW03) provided on the PC board as follows.

ON

123456

OFF

2. Check the black lead wire is double wound around the current trans. (CT. T02)

1
2
3

OFF
4
5
6

ON

– 57 –

12-1. Indoor Unit (1)

12. EXPLODED VIEWS AND PARTS LIST

420

415

403

407

414

419

410

411

416

417

Location Part

No. No.

403 43T60002 Base, T erminal

3P, AC 300V, 20A

407 43T69004 Sensor, Heat Exchanger

10kΩ, 25°C

410 43T69005 Sensor, Thermostat

10kΩ, 25°C
41 1 43T60004 Fuse, Temperature 77°C
414 43T69007 PC Board, WRS-LED

MCC-635

Description

403

– 58 –

Location Part

No. No.

415 43T69008 PC Board A’ssy MCC-713
416 43T61001 Base, E-Parts

ABS, Black, UL94-5V

417 43T62006 Base, Shield

SGCC-Z08-LUB

419 43T60001 Base, T erminal

2P, AC 300V, 20A

420 43T60005 Housing 4P

Description

Indoor Unit (2)

Location Part

No. No.

401 43T69003 Relay, Power

DI1U, 20A, A C 250V
402 43T58002 Transfor mer, Switching

SWT-34
404 43T60003 Fuse 3.15A, AC 250V
405 43T32001 Resistor 5.6Ω, 5W
406 43T33001 Capacitor, Electrolytic

100MFD, 450V, AUF

Description

– 59 –

Location Part

No. No.

408 43T55004 Varistor 560V
409 43T34001 Filter, Line 0.6A
412 43T30001 IC, Switching MA 2830P-FJ
413 43T31001 Diode, Rectifier

RBV -406, 600V

418 43T58001 Transformer, Current

CT422920S-01

Description

Indoor Unit (3)

201

202

206

203

207

210

214

211

243

216

217

215

221

208

222

234

212

209

228

229

213

239

230

219

220

218

223

224

235

231

225

241

240

233

232

226

227

236

237

205

204

Location Part

No. No.

201 43T00002 Front Panel Assembly
202 43T00003 Suction Grille
203 43T80001 Air Filter (L)
204 43T80002 Air Filter (R)
205 43T80003 Frame Filter
206 43T07004 Screw Cap (L)
207 43T07003 Screw Cap (R)
208 43T08001 LED Panel (10SKH-E)
208 43T08006 LED Panel (10SKHX)
209 43T19004 Accepted Signal Filter
210 43T09003 Horizontal Louver Assembly

for Service
21 1 43T09004 Louver Assembly
212 43T70001 Drain Hose Assembly
213 43T21003 Motor Stepping
214 43T07001 Bushing
215 43T44002 Refrigerantion Cycle

Assembly
216 43T47006 Pipe, Delivery
217 43T47005 Pipe, Suction
218 43T49007 Pipe, Shield
219 43T19003 Holder, Sensor
220 43T49003 Spring
221 43T49005 Plate of EVA-SEAL

Description

242

Location Part

No. No.

222 43T49006 Holder for Plate of EVA-SEAL
223 43T49004 Rubber of Sound Insulation
224 43T79002 Drain Guide
225 43T39002 Motor Band (Left)
226 43T39001 Motor Band (Right)
227 43T21005 Fan Motor
228 43T20007 Fan, Cross Flow
229 43T22002 Bearing
230 43T39003 Base, Bearing
231 43T03001 Rear Plate
232 43T07002 Pipe Holder
233 43T82001 Installation Plate
234 43T85001 Owner’s Manual (10SKH-E)
234 43T85003 Owner’s Manual (10SKHX)
235 43T11001 Pipe Shield
236 43T69002 Remote Control
237 43T63002 Holder, Remote Control
238 43T62001 Cover, E-Part s
239 43T62002 Terminal Cover (Up)
240 43T62005 T e rminal Cover (Down)
241 43T62003 Cord Clamp
242 43T62004 Shield Cover
243 43T60007 Cord Power

238

Description

– 60 –

12-2. Outdoor Unit

19

23

24

16

25

17

6

4

5

12
15

8, 9

3

14

2

13

10, 11

20

21
22

18

7 : CAPILLARY TUBE

1

Location Part

No. No.

1 43T19001 Guard Fan
2 43T20001 Fan, Propeller
3 43005037 Front Cabinet
4 43T43001 Condenser
5 43062194 Cover, E-Parts
6 43005038 Back Cabinet
7 43T47004 Capillary-Tube 1.7 DIA
8 43T46001 Packed Valve, 9.52
9 43T47002 Bonnet, 9.52 DIA
10 43T46002 Packed Valve, 6.35
11 43T47003 Bonnet, 6.35 DIA
12 43T46003 4-Wa y-Valve, VH7100D
13 43T21001 Fan-Motor UE6-21SJ5P

Description

Location Part

No. No.

14 43T47001 Flange, Nut
15 43046255 Solenoid Coil
16 43T19005 Handle
17 43T49001 Rubber-Cushion
18 43T79001 Nipple, Drain
19 43T19002 Stopper , Guard
20 43T63001 Holder , OL-Relay
21 43054403 Relay, Over-Load

J-MRA 99269-9200
22 43T41400 Compressor, PH120T1-4C
23 43055483 MF Capacitor 25µF 400V
24 43T55001 MF Capacitor 1.5µF, 500V
25 43060049 Terminal Block, 5P

Description

– 61 –