Toshiba RAS-10SK-E x2, RAS-M18SA-E, RAS-10SKX x2, RAS-M18SAX Service Manual

SERVICE M ANUAL

M U LTI SPLIT W A LL TY PE

TO SH IB A

PRIN TED IN JAPAN, Feb.,1997 ToM o

FIL E N O . A 00-9704

AIR-CONDITIONER

R A S -10S K -E x2

RAS-M 18SA-E

R A S -10S K X x2

RAS-M 18SAX

– 2 –

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. AUTO Operation ....................................................................................................................... 14

7-4-1. Temporary Auto .....................................................................................................................................14

7-5. ECONO. Mode........................................................................................................................... 15

7-5-1. Cooling.................................................................................................................. .................................15

7-6. Low-Temperature Limit Control (Cooling Operation) .......................................................... 15

7-7. Auto Restart Function ............................................................................................................. 1 6

7-7-1. How to Set the Auto Restart.................................................................................................................16

7-7-2. How to Cancel the Auto Restart ..........................................................................................................17

7-7-3. In Case of Power Failure during the Timer Operation .......................................................................17

8. INSTALLATION PROCEDURE...................................................................................... 18

8-1. Safety Cautions ............................................................................................................ ............ 18

8-2. Installation Diagram of Indoor and Outdoor Units ............................................................... 20

8-3. Installation ................................................................................................................................ 21

8-3-1. Optional Parts........................................................................................................................................21

8-3-2. Installation Parts ...................................................................................................................................21

8-4. Indoor Unit ................................................................................................................................ 22

8-4-1. Cutting a Hole and Mounting Installation Plate .................................................................................22

8-4-2. Electrical Work ......................................................................................................................................23

8-4-3. Wiring Connection ................................................................................................................................24

8-4-4. Piping and Drain Hose Installation......................................................................................................26

8-4-5. Indoor Unit Installation .........................................................................................................................27

8-4-6. Drainage................................................................................................................. ................................27

8-5. Outdoor Unit ............................................................................................................................. 28

8-5-1. Refrigerant Piping Connection ............................................................................................................29

8-5-2. Vacuum Pumping ..................................................................................................................................29

8-5-3. Wiring Connection ................................................................................................................................30

8-6. Others ........................................................................................................................................ 32

8-6-1. Gas Leak Test ........................................................................................................................................ 32

8-6-2. Test Operation.......................................................................................................................................3 2

8-6-3. Auto Restart Setting .............................................................................................................................32

– 3 –

9. TROUBLESHOOTING CHART...................................................................................... 33

9-1. What to be Prechecked First .................................................................................................. 33

9-1-1. Power Supply Voltage ........................................................................................................................... 3 3

9-1-2. Incorrect Cable Connection between Indoor and Outdoor Units.....................................................33

9-1-3. Misleading but Good Operations.........................................................................................................34

9-2. Primary Judgement of Tro uble Sources ............................................................................... 35

9-2-1. Role of Indoor Unit Controller..............................................................................................................35

9-2-2. Display of Abnormalities and Judgement of the Abnormal Spots...................................................35

9-3. Troubleshooting Flowcharts ................................................................................................... 39

9-3-1. Power can not be Turned on ................................................................................................................39

9-3-2. Power can not be Turned on after Replacing Indoor PC Board .......................................................40

9-3-3. Outdoor Unit does not Operate ...........................................................................................................40

9-3-4. Only Compressor does not Operate ................................................................................................... 41

9-3-5. Only Outdoor Fan does not Operate ...................................................................................................42

9-3-6. Only the Indoor Fan does not Operate................................................................................................43

9-4. How to Check the Remote Control (Including the Indoor PC Board) ................................ 44

9-4-1. How to Check the PC Board.................................................................................................................45

9-4-2. PC Board Layout ...................................................................................................................................47

9-4-3. How to Reduce the Operation Time of the Anti-Restar t Timer .........................................................48

10. PART REPLACEMENT ................................................................................................. 49

10-1. Indoor Unit (RAS-10SK-E, RAS-10SKX) ................................................................................ 49

10-2. Microcomputer (RAS-10SK-E, RAS-10SKX) ......................................................................... 51

10-3. Outdoor Unit (RAS-M18SA-E, RAS-M18SAX) ....................................................................... 52

11. CAUTIONS ON REPLACEMENT OF PC BOARD ASSEMBLY.................................... 54

12. EXPLODED VIEWS AND PARTS LIST ........................................................................ 55

12-1. Indoor Unit (1)........................................................................................................................... 55

Indoor Unit (2)................................................................................................................ ........... 56

12-2. Outdoor Unit ............................................................................................................................. 57

– 4 –

1. SPECIFICATIONS

Specifications are subject to change without notice.

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

*1

A

Indoor (H/M/L)
Outdoor
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

(220/230/240V)

Model
Output

Model

kW
Phase

V
Hz

kW
%

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-10SK-E (2 units) / RAS-M18SA-E

RAS-10SKX (2 units) / RAS-M18SAX

COOLING

1 Indoor unit 2 Indoor units

(A or B) (A + B)

220V 230V 240V 220V 230V 240V

2.6 2.6 2.6 5.2 5.2 5.2
Single

220/230/240

50

220V 230V 240V 220V 230V 240V

0.89 0.91 0.94 1.78 1.82 1.88
97 97 96 97 97 96

0.15/4 0.15/3.95 0.15/3.95 0.3/8 0.3/7.9 0.3/7.9
16 32

1.15 2.3
44/36/31

52

R-22

1.3 (0.65 x 2)

Capillary tube

9.52

Flare connection

6.35

Flare connection

15

5

16

RAS-10SK-E, RAS-10SKX

265
790
174

8

Finned tube

Cross flow fan

650
510
430

19

Polypropylene net filter (Washable)

RAS-M18SA-E, RAS-M18SAX

538
830
300

52

Finned tube

Propeller

1830/1920/2010

28

PH102T1-4C

750

Fuse, Overload relay

Yes

21 ~ 43

– 5 –

Notes : *2

• This air conditioner accepts a connection piping length of up to 15m 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.

• There is need to add the refrigerant 10g/m as long as the each length of the connection piping is up from 11m
to 15m.

Note : *1

• Capacity is based on the following temperature conditions.

T emperature

Indoor unit inlet air temperature

Outdoor unit inlet air temperature

Condition

(DB)

(WB)

(DB)

(WB)

JIS C9612-1994

Cooling

27°C
19°C
35°C
24°C

– 6 –

2. CONSTRUCTION VIEWS

2-1. Indoor Unit

RAS-10SK-E
RAS-10SKX

,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,

Air filter

790

Heat exchanger

Air inlet

265

Air outlet

47

10

50

174

47

10

50

Wireless
remote
control

55

16

559.6

Remote
control
holder

112.8

136

Knock out system

790

232 326 232

Hanger

321

Drain hose (0.54m)

Connecting pipe (0.39m)

(Flare ø6.35)

(Flare ø9.52)

Hanger

65965.5

326

450

65.5

For stud bolt
(ø8~ø10)

For stud bolt
(ø6)

Hanger

Minimum
distance to wall

Minimum
distance
to ceiling

265

Knock out system

Front panel

Back body

20 2037

40.5

60.5

790

12626931976

Center line

Installation
plate outline

HangerHanger

40.5

3.5

Hanger

Minimum
distance
to wall

17 20

46

120 or more 120 or more

66 or more

2.5

Connecting pipe (0.49m)

1800

10SK-E : Without power cord
10SKX : With power cord

– 7 –

325

23

301

325

325

538

54545491

100 or more

100 or more

600 or more

600 or more

Installation dimension

4xø11x14

for ø8-ø10

anchor bolt

600

Air inlet

Air inlet

Air outlet

ø11x14 hole

ø6 hole

R10

600

Detail Drawing

50

36

300

90 600 90 50

830 60 344

A

6-ø11x14 hole

(for ø8-ø10 anchor bolt)

8-ø6 hole

(for fixing outdoor unit)

Liquid side

(Flare ø6.35)

Gas side

(Flare ø12.7)

A

Handle

ø420

Fan guard

Electric

Parts cover

Service port

FOR UNIT B

FOR UNIT A

2-2. Outdoor Unit

RAS-M18SA-E
RAS-M18SAX

– 8 –

3. WIRING DIAGRAM

1

2

3

4

56789

1

2

3

4

56789

1

23

4

56789

1

2

1

2

1

2

1

2

L

N

1

2

3

4

6

5

IC

Internal circuit is same

as that of INDOOR UNIT A.

INDOOR UNIT B

OUTDOOR UNIT

BLK

BLK

A151311

B161412

BLK

WHI

GRN&YEL

GRN&YEL

P04

BLK

BRW

BLU

PNK

YEL

ORN

RED

BRW

GRY

GRY

BLU

CN04

CN07

CN10

BLU

CN03 CN01

CN13

CN25

BLK

BLK

BLK

BLK

IC01

IC02

C06

DC 35V

DC 12V

DC 7V

DC 0V

T01

MAIN P.C. BOARD

MCC-713

C02

DB01

R01

C01

L01

C15

IC04

R109

F01 FUSE

T3.15A

250V

R21

RY01

RY02

WHI
BLK

3

4

3

4

POWER

TERMINAL

BLOCK

INDOOR

TERMINAL

BLOCK

NO

CONNECTION

INFRARED RAYS RECEIVE

AND INDICATION PARTS

THERMO
SENSOR

(TA)

HEAT

EXCHANGER

SENSOR

(TC)

LOUVER

MOTOR

INDOOR UNIT AINDOOR

UNIT A

FAN MOTOR

:
:
:
:
:

:
:
:
:
:

BROWN
RED
WHITE
YELLOW
BLUE

BLACK
GRAY
PINK
ORANGE
GREEN &

YELLOW

BRW

RED

WHI
YEL
BLU

BLK

GRY

PNK

ORN

GRN&YEL

COLOR IDENTIFICATION

THERMAL FUSE

77˚C x 2

VARISTOR

3

1

1

2

3

4

6

5

1

2

3

4

5

1

2

3

4

5

3

1

DC

MOTOR

SG01

DSA

BLU

BLU

BLU

BLU

BLU

PNK

BLK

WHI

R116

RAS-10SK-E

220/230/240V ~

50Hz

RAS-10SKX

220/230/240V ~

50Hz

L
N

L
N

Model Section A

Section A

1

2

1

2

1

2

BLU

YEL

BLK

RED

WHI

OUTDOOR
TERMINAL

BLOCK

POWER SUPPLY
50Hz
220/230/240V ~

TERMINAL

BLOCK

POWER TERMINAL

BLOCK

SPARK KILLER

RUNNING

CAPACITOR

MAGNETIC RELAY

DSA : Surge absorber

1

2

N

L

WHI

WHI

WHI

RED

RED WHI

WHI
PNK

BLK

BLK

BLK

BLK

BLK BLK

BLK

RED

BLK

BLK
RED
RED
BLK

RUNNING

CAPACITOR

RED

RED

WHI

WHI
RED

BLK

A151311

B161412

RUNNING

CAPACITOR

COMPRESSOR

(FOR UNIT B)

OVER LOAD

RELAY

COMPRESSOR

(FOR UNIT A)

OVER LOAD

RELAY

MAGNETIC RELAY
WHI
RED

RED WHI

WHI
PNK

BLK BLK

RED

BLK

BLK

BLK BLK

RED

RED RED

REDRED

RED
BLK

1 2 3 4

GRN&YEL

Fan

motor

Compressor

(For unit B)

Compressor

(For unit A)

Running capacitor
(For fan motor)

Running capacitor
(For unit B compressor)

Running capacitor
(For unit A compressor)

Magnetic relay
(For unit B)

Magnetic relay (For unit A)

Spark killer
(For unit B)

Spark killer
(For unit A)

TERMINAL BLOCK
(FOR POWER SUPPLY)

Terminal block
(For connecting cable)

FAN MOTOR

Electrical parts position

Parts position

– 9 –

Specifications

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

(at 20°C)
Output (Rated) 28W, 6pole, 1phase, 220/230/240V, 50Hz

Winding resistance (Ω)
(at 20°C)

450V AC, 2µF

400V AC, 25µF
U/T 6.1A (80°C), OPEN 135±5°C, CLOSE 78±11°C

220–240V, 50Hz
AC 500V, 50/60Hz, 0.1µF, 120Ω

4. SPECIFICATIONS OF ELECTRICAL PARTS

4-1. Indoor Unit

RAS-10SK-E
RAS-10SKX

4-2. Outdoor Unit

RAS-M18SA-E
RAS-M18SAX

No.

1

2
3

4
5

6
7

8

9
10
11
12
13
14

Parts name

Fan motor (for indoor)

Thermo sensor
(TA-sensor)

DC-DC transformer (T01)
Microcomputer
Power relay (RY01),

Common relay (RY02)
Heat exchanger sensor

(TC-sensor)
Line filter (L01)
Diode (DB01)
Capacitor (C02)
Fuse (F01)
Power supply IC (IC01)
Va ristor (R21, R109)
Resistor (R01)
Louver motor

Type

ICF-35-19-3

or

TICF-35-19-3

(microprocessor)

SWT-34

TMP87CK40F

DI1U

(microprocessor)

RF-103YOR6

RBV-406

CEAUF2W101M20

MT3

MA2830-FJ

15G561K

ERF-5TK5R6

MP35EA7

Specifications

DC 35V, 19W

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

Coil : DC12V 75mA, Rated AC250V 20A

10kΩ at 25°C
10mH, AC 0.6A

4A, 600V
100µF, 450V
T3.15A, 250V
4A, 600V
560V

5.6 Ω, 5W
Output (Rated) 2W, 10poles, 1phase DC 12V

No.

1

2

3

4

5

6

7

Parts name

Compressor

Fan motor

Running capacitor
(for fan motor)

Running capacitor
(for compressor)

Overload relay
Magnetic relay
Spark killer

Type

PH102T1-4C

AF-230-28P

SK-45FMP

SK-40CMP25U1

J-MRA99285-9201

VC 20FA

RFM50S104KD2

Red-Black White-Black

3.88 5.06

Red-Black White-Black

162.1 233.5

– 10 –

5. REFRIGERANT CYCLE DIAGRAM

RAS-10SK-E x 2 / RAS-M18SA-E
RAS-10SKX x 2 / RAS-M18SAX

Condenser

Cooling

Cooling

Packed valve

(ø6.35)

Packed valve

(ø9.35)

Packed valve

(ø9.35)

Packed valve

(ø6.35)

0.49m
(Connecting pipe)
ø6.35

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

O.D.:9.52mm

0.39m
(Connecting pipe)
ø9.52

O.D.:6.35mm

0.49m
(Connecting pipe)
ø6.35

0.39m
(Connecting pipe)
ø9.52

Evaporator

INDOOOR UNIT A

Cross flow fan

Optional piping kits
RB-P31BFH1 (3m)
RB-P51BFH1 (5m)

RB-P71BFH1 (7m)

T1

Evaporator

INDOOR UNIT B

Cross flow fan

T1

P

P

Propeller fan

Capillary
tube
ø1.5x1100

Strainer Strainer

Capillary
tube
ø1.5x1100

Compressor

B

PH102T1-4C

Compressor

A

PH102T1-4C

OUTDOOR UNIT

Mark ( ) means check points of Gas Leak

Refrigerant
R-22 1.3kg
(0.65kgx2)

Note :

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

Fig. 5-1

Table 5-1

50Hz

Standard

Cooling High temperature

Low temperature

Standard pressure

P

(kg/cm²G)

5.0

6.5

4.0

Surface temp. of heat

exchanger interchanging

pipe T1 (°C)

13.0

18.0

2.0

Fan speed

(indoor)

High
High

Low

Ambient temp.

conditions DB/WB

(°C)

Indoor Outdoor

27/19 35/24
32/23 43/26
21/15 21/15

– 11 –

6. MICRO-COMPUTER BLOCK DIAGRAM

Infrared Rays Signal Receiver

Functions

ECONO.

Louver Direction Setting

Louver AUTO Swing

OFF TIMER Setting

ON TIMER Setting

Fan Speed Selection

Thermo Setting

Operation Mode Selection

AUTO, COOL, DRY, FAN ONLY

Operation (START/STOP)

Clock Frequency

Oscillator Circuit

Heat Exchanger Sensor

Infrared

Rays

Initializing Circuit

C. P. U

Main Unit Control Panel

AC 220/230/240V~

50Hz

Remote Control

Operation

Display

Timer

Display

ECONO.

Sign Display

FAN-ONLY

Sign Display

Indoor

Fan Motor

Compressor, Outdoor Fan

ON/OFF Signal

Louver

Motor

RY02

RY01

Thermo Sensor

• Louver Control

• 3-minute Delay at Restart for Compressor

• Motor Revolution Control

• Processing

(Temperature Processing)

• Timer

Magnetic Relay

AC 220/230/240V~

50Hz

Relay Driver, Louver Driver

Relay

Power Supply

Circuit

Louver

ON/OFF Signal

Noise Filter

Relay

Compressor Outdoor Fan Motor

– 12 –

7. OPERATION DESCRIPTIONS

7-1. FAN ONLY Operation

(MODE of the remote control : FAN ONLY)
(1) During this mode, the relay RY01 is alwa ys turned

off so that only the indoor fan is operated. RY02 is
always turnd on. FAN-ONLY display is lit.

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.

7-2. COOL Operation

(MODE of the remote control : COOL)
(1) Compressor, outdoor fan and operation displa y are

controlled as shown in Fig. 7-2-1.

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.

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

Table 7-1-1 Manual setting of FAN SPEED

(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.

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.

(Room temp. – Set temp.)

MED

LOW(+)

LOW
LOW

(continuous)

+4
+3
+2
+1

0

RY01

OFF

Set
temp.

Manual

FAN

According
to the set

position

HIGH

AUTO

(Room temp. – Set temp.)

+1

0

Set
temp.

ON

OFF

OPERATION

display

ON ON

Compressor

Outdoor fan

(RY01)

Common relay

(RY02)

HIGH

MED
LOW(+)

LOW

LOW

28
27
26
25
24

Room temp.

Indication of

FAN SPEED

LOW
MED

HIGH

HIGH Air volume

(m3/h)

430
510
650

– 13 –

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, outdoor fan and operation displa y are

controlled as shown in Fig. 7-3-1.

Fig. 7-3-2

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 rela-

tion between room temperature and set tempera­ture is shown below:

Room temp.

Set temp.+1
Set temp.

Compressor
Outdoor fan

Indoor fan

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

ON ON ON ON

OFF OFF OFF

*

Super Low

(Room temp. – Set temp.)

Set
temp.

ON

+3

+2

+1

0

OFF

OPERATION

display

Compressor

Outdoor fan

(RY01)

Common relay

(RY02)

ON:6min.

OFF:4min.

ON:5min.

OFF:5min.

ON

– 14 –

7-4. AU TO Operation

(MODE of the remote control : AUTO)
(1) One of the 2 modes, Cooling or Dry is selected

according to room temperature at which opera­tion is to start, as shown in Fig. 7-4-1. The Fan
mode will continue until room temperature reaches
a level at which another mode is selected.

7-4-1. Temporary Auto

When the TEMPORAR Y button is pushed, the set tem­perature is fixed at 24°C and controlled in accordance
with the chart shown in Fig. 7-4-1.

Fig. 7-4-1

Cooling mode

Cooling mode

Dry mode

+4

+1

(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)

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

(Room temp. – Set temp.)

– 15 –

7-5. ECONO. Mode

When the ECONO. button is pushed, during COOL
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.

7-5-1. Cooling

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

control is changed automatically as shown in Fig.
7-5-1.

(2) Fan speed → LOW

+2

+1

Set temp.

1H 2H TIME0H

(˚C)

ECONO. button
is pushed

Set temp.
is changed

Set temp.
is changed

7-6. Low-Temperature Limit Control

(Cooling Operation)

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. 7-6-1.

Fig. 7-5-1

Compressor

Less than 5˚C continues

for 5 minutes

OFF

ON

Outdoor fan

7

Heat exchanger
temperature

5

(˚C)

Fig. 7-6-1

– 16 –

7-7. 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.

7-7-1. 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 po wer 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 continuously for 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:

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.)

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

• During louver swing (A UT O) operation, after restart
by the Auto Restart function the louver swing stops.

• When the system is operating

TEMPORARY

0

3S

TEMPORARY

0

3S

OPERATION

Press the TEMPORARY button
continuously more than three
seconds.

MOTION

Stand-by

↓

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

↓ about three seconds after

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.

OPERATION

Press the TEMPORARY button
continuously more than three
seconds.

MOTION

Operating The green light is lit.

↓

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

↓ about three seconds after

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.

– 17 –

7-7-2. 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.

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

Cancellation is carried out:

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

• When the system is operating

During subsequent operation, the green light is lighting.

7-7-3. 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.

TEMPORARY

0

3S

TEMPORARY

0

3S

(2) If OFF-TIMER operation is reserved without set-

ting of Auto Restart operation, the reservation 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 OFF­TIMER operation. When Auto Restart operation
is set, OFF-TIMER reservation is also cancelled
with power failure.

OPERA TION

Press the TEMPORARY button
continuously more than three
seconds.

MOTION

Stand-by

↓

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

↓ about three seconds after

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.

OPERATION

Press the TEMPORARY button
continuously more than three
seconds.

MOTION

Operating The orange light is lit.

↓

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

↓ about three seconds after

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.

– 18 –

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 SWITCH AND BREAKER OF OUTDOOR UNIT AND INDOOR UNIT

BEFORE ATTEMPTING ANY ELECTRICAL WORK.
INDIVIDUAL POWER SUPPLY IS PROVIDED IN THIS OUTDOOR UNIT. MAKE SURE ALL POWER

SWITCHES AND BREAKER TURN OFF. FAILURE TO DO SO 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 EAR TH WIRE IS NOT BROKEN OR DISCONNECTED BEFORE INSTALLATION.
` DO NOT INSTALL NEAR CONCENTRATIONS OF COMBUSTIBLE GAS OF GAS VAPORS.

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

WELL AW AY (MORE THAN 2M.) FROM HEAT SOURCES SUCH AS RADIA T ORS, HEAT RESISTORS, FUR-

NACE, 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 O THER GAS IS MIXED IN THE REFRIGERANT, THE

GAS PRESSURE IN THE REFRIGERATION CYCLE BECOMES ABNORMALL Y HIGH AND IT RESUL TINGLY

CAUSES BURST OF THE PIPE AND INJURIES ON PERSONS.
` IN THE EVENT THAT THE REFRIGERANT GAS LEAKS OUT OF THE PIPE DURING THE INSTALLATION

WORK, IMMEDIATELY LET FRESH AIR INTO THE ROOM. IF THE REFRIGERANT GAS IS HEATED BY

FIRE OR SOMETHING ELSE, IT CAUSES GENERATION OF POISONOUS GAS.

WARNING

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