Toshiba RAS-10SKH-ES User manual

PRINTED IN JAPAN, May.,1998 ToMo
SERVICE MANUAL
FILE NO. A00-9808
AIR-CONDITIONER
SPLIT WALL TYPE
SUPPLEMENT
RAS-10SKH-ES / RAS-10SAH-ES
RAS-13SKH-ES / RAS-13SAH-ES

– 2 –
CONTENTS
1. SPECIFICATIONS..........................................................................................................................3
2. CONSTRUCTIONVIEWS ..............................................................................................................5
2-1. Indoor Unit ........................................................................................................................................ 5
2-2. Outdoor Unit ..................................................................................................................................... 6
3. WIRING DIAGRAM ........................................................................................................................8
4. SPECIFICATIONS OF ELECTRICAL PARTS ...............................................................................9
5. REFRIGERANT CYCLE DIAGRAM.............................................................................................11
6. MICRO-COMPUTER BLOCK DIAGRAM ....................................................................................13
7. OPERATION DESCRIPTIONS..................................................................................................... 14
7-1. FAN ONLY Operation...................................................................................................................... 14
7-2. COOL Operation............................................................................................................................. 14
7-3. DRY Operation ................................................................................................................................ 15
7-4. HEAT Operation .............................................................................................................................. 16
7-5. AUTO Operation ............................................................................................................................. 17
7-6. ECONO. Mode................................................................................................................................. 18
7-7. Current Limit Control ..................................................................................................................... 18
7-8. High-Temperature Limit Control (Heating Operation) ................................................................. 19
7-9. Low-Temperature Limit Control (Cooling Operation) .................................................................. 19
7-10. Cool Airflow Prevention Control (Heating Operation) ................................................................. 19
7-11. Defrost Operation........................................................................................................................... 20
7-12. Auto Restart Function.................................................................................................................... 21
8. INSTALLATION PROCEDURE ....................................................................................................23
8-1. Safety Cautions .............................................................................................................................. 23
8-2. Installation Diagram of Indoor and Outdoor Units ...................................................................... 25
8-3. Installation ...................................................................................................................................... 26
8-4. Indoor Unit ...................................................................................................................................... 28
8-5. Outdoor Unit ................................................................................................................................... 34
8-6. Others.............................................................................................................................................. 37
9. TROUBLESHOOTING CHART....................................................................................................38
9-1. What to be Prechecked First ......................................................................................................... 38
9-2. Primary Judgement ofTrouble Sources ....................................................................................... 40
9-3. Troubleshooting Flowcharts.......................................................................................................... 44
9-4. How to Check the Remote Control (Including the Indoor P.C. Board)........................................ 50
10. PART REPLACEMENT ................................................................................................................55
10-1. Indoor Unit ...................................................................................................................................... 55
10-2. Microcomputer ............................................................................................................................... 57
10-3. Outdoor Unit ................................................................................................................................... 58
11. CAUTIONS ON REPLACEMENT OF P.C. BOARD ASSEMBLY ................................................59
12. EXPLODEDVIEWS AND PARTS LIST .......................................................................................61
12-1. Indoor Unit (1)................................................................................................................................. 61
Indoor Unit (2)................................................................................................................................. 63
Indoor Unit (3)................................................................................................................................. 65
12-2. Outdoor Unit ................................................................................................................................... 66
• This air conditioner is charged with HFC (R-410A)
that doesn't deplete the Ozone layer.
• This air conditioner requires special service tools
for the refrigerant R-410A.

– 3 –
1. SPECIFICATIONS
Model
Item
Capacity *1 kW
Phase
Power source V
Hz
Power consumption kW
Power factor %
A
Running current
Indoor/Outdoor
Starting current A
Moisture removal lit/h
Indoor (H/M/L) dB
Noise Outdoor
(220/230/240V) dB
Refrigerant Name of refrigerant
Rated volume kg
Refrigerant control Gas side size mm
Connection type
Liquid side size mm
Interconnection Connection type
pipe Maximum length m *2
(One way)
Maximum height difference
Indoor unit m
Outdoor unit
Condensate drain Outer diameter mm
pipe
INDOOR UNIT Height mm
Dimensions Width mm
Depth mm
Net weight kg
Evaporator type
Indoor fan type High fan m3/h
Air volume Medium fan m3/h
Low fan m3/h
Fan motor output W
Air filter
OUTDOOR UNIT Height mm
Dimensions Width mm
Depth mm
Net weight kg
Condenser type
Outdoor fan type
Airflow volume m3/h
Fan motor output W
Compressor Model
Output W
Safety device
Auto louver
Usable outdoor temperature range °C
RAS-10SKH-ES/RAS-10SAH-ES RAS-13SKH-ES/RAS-13SAH-ES
Cooling Heating Cooling Heating
220V 230V 240V 220V 230V 240V 220V 230V 240V 220V 230V 240V
2,65 2,68 2,70 3,00 3,05 3,10 3,45 3,50 3,50 4,0 4,05 4,1
Single
220/230/240
50
0,98/0,99/1,02 0,89/0,90/0,91 1,26/1,28/1,30 1,19/1,23/1,27
98/95/93 95/93/90 98/97/94 97/96/93
220V 230V 240V 220V 230V 240V 220V 230V 240V 220V 230V 240V
0,11/ 0,11/ 0,11/ 0,11/ 0,11/ 0,11/ 0,15/ 0,15/ 0,15/ 0,15/ 0,15/ 0,15/
4,44 4,42 4,46 4,15 4,10 4,10 5,70 5,59 5,61 5,43 5,42 5,54
19 25
1,2 2,0
41/36/31 44/39/36
47/48/49 49/50/51
R-410A
0,69 0,8
Capillary tube
9,52
Flare connection
6,35
Flare connection
10 15
56
16
RAS-10SKH-ES RAS-13SKH-ES
265
790
174
8
Finned tube
Cross flow fan
600 650
500 560
400 510
19
Polypropylene net filter (Washable)
RAS-10SAH-ES RAS-13SAH-ES
530 538
770 780
200 300
31 42
Finned tube
Propeller
1600 1700
18 28
PA118X1T-4FZ PA160X2T-4FM
750 1100
Fuse, Overload relay
Yes
21 ~ 43 – 5 ~ 21 21 ~ 43 – 5 ~ 21
Specifications are subject to change without notice.

– 4 –
Note : *1
• Capacity is based on the following temperature conditions.
Cooling
27°C
19°C
35°C
24°C
Heating
20°C
12°C
7°C
6°C
JIS C9612-1994Condition
(DB)
(WB)
(DB)
(WB)
Temperature
Indoor unit inlet air temperature
Outdoor unit inlet air temperature
Notes : *2 CHARGELESS
RAS-10SKH-ES
• 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.
RAS-13SKH-ES
• No additional refrigerant required.
• This air conditioner accepts a connection piping length of up to 15m and a head of up to 6m.
• There is no need to add the refrigerant as long as the total length of the connection piping is up to 15m.

– 5 –
2. CONSTRUCTION VIEWS
2-1. Indoor Unit
RAS-10SKH-ES
RAS-13SKH-ES
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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)

– 6 –
2-2. Outdoor Unit
RAS-10SAH-ES
600 85
36 111 ø25 Drain hole
50
30
216 230
8-ø6 Holes
(For fixing the outdoor unit)
4-ø11x14 Long holes
(For anchor bolt ø8-ø10)
Gas side (flare ø9,52)
Liquid side (flare ø6,35)
111
A
600
R10
50
36
25
216 230
ø11x14 Hole ø6 Hole
Handle
11
525 530
5
268
Fan guard
ø420
TOSHIBA
770 59
89
200
11
12
Electric
parts cover
Z
54 62
Service
port
250
Z
View
600
45 or more
Inlet port
600 or more
(Minimum distance
of the wall)
4-ø11x14 Long holes
(For anchor bolt ø8-ø10)
200 or more
Outlet
port
Center
port
230
100 or more
Inlet port Visible outline
of the product
A
Detail Drawing
Mounting dimension of anchor bolt
268
770
59
89

– 7 –
RAS-13SAH-ES
,
,
,



,
,
,



538
325
325
52,5
23
301
325
300
Handle
ø25Drain outlet
Electric parts cover
Service
port
61
54
325 (pitch) (8,5)
(8,5) 342
100 or more
100 or more 600 or more
600 or more
Installation dimension
600
Air inlet
Air outlet
8-ø6 hole ( (for fixing outdoor unit)
Liquid side (Flare ø6,35)
Gas side (Flare ø9,52)
120
ø11x14 hole
ø6 hole
R10
600
Detail Drawing
50
36
AA
,,
6-ø11x14 hole (for ø8-ø10 anchor bolt)
600
100
130
780 90 65,5
27
Fan guard
ø420
Z
View
Z
4xø11x14 Long holes (for ø8-ø10 anchor bolt)

– 8 –
3. WIRING DIAGRAM
123456789
123456789
123456789 12
1212
12
L
N
1234
44
3
2
11
1
2
3
4
65
IC
FAN MOTOR
BLK
WHI
PNK
WHI
BLK BLU
RED
SOLENOID
COIL
RED
RUNNING
CAPACITOR
RUNNING
CAPACITOR
BLK
GRN & YEL
CHASSIS
INDOOR
OUTDOOR
BLK
WHI
RED
BLU
GRN&YEL
CN27
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
DC35V
DC12V
DC7V
DC0V
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
T02
C.T.
RY03 RY04
POWER
TERMINAL
BLOCK
INDOOR
TERMINAL
BLOCK
INFRARED RAYS RECEIVE
AND INDICATION PARTS THERMO
SENSOR
(TA)
HEAT
EXCHANGER
SENSOR
(TC)
LOUVER
MOTOR
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 × 2
VARISTOR
3
1
1
2
3
4
651
2
3
4
51
2
3
4
5
3
1
DC
MOTOR
SG01
DSA
CR01
CR02
BLU BLU BLU BLU BLU PNK BLK WHI
R116
RAS-10SKH-ES/10SAH-ES
220/230/240V ~
50Hz
RAS-13SKH-ES/13SAH-ES
220/230/240V ~
50Hz
L
N
Model Section A
1234
COMPRESSOR
DSA : Surge absorber
C.T : Current trans
BLU
RED
BLU YEL
BLK
RED
WHI

– 9 –
4. SPECIFICATIONS OF ELECTRICAL PARTS
4-1. Indoor Unit
RAS-10SKH-ES
No. Parts name Type Specifications
1 Fan motor (for indoor) TICF-35-19-3 Output (Rated) 19W, 2poles, 1phase, 220/230/240V, 50Hz
2Thermo sensor (microprocessor) 10kΩat 25°C
(TA-sensor)
3 DC-DC transformer (T01) SWT-34 DC 390V, Secondary DC 35V, 12V, 7V
4 Microcomputer TMP87CK40F
5Power relay (RY01), DI1U Coil : DC 12V 75mA, Rated AC 250V 20A
Common relay (RY02)
6Heat exchanger sensor (microprocessor) 10kΩat 25°C
(TC-sensor)
7 Line filter (L01) RF-103YOR6 10mH, AC 0,6A
8 Diode (DB01) RBV-406 4A, 600V
9 Capacitor (C02) CEAUF2W101M20 100µF, 450V
10 Fuse (F01) MT3 T3,15A, 250V
11 Relay (for outdoor fan motor, AJQ1341 Coil DC 12V, 33mA, Rated 1A, AC 250V
solenoid coil) (RY03, RY04)
12 Power supply IC (IC01) MA2830-FJ 4A, 600V
13 Varistor (R21, 109) 15G561K 560V
14 Resistor (R01) ERF-5TK5R6 5,6 Ω, 5W
15 Current trans (T02) CT422920S-01
16 Louver motor MP35EA7 Output (Rated) 2W, 10poles, 1phase, DC 12V
4-2. Outdoor Unit
RAS-10SAH-ES
No. Parts name Type Specifications
Output (Rated) 750W, 2poles, 1phase, 220/230/240V, 50Hz
1 Compressor PA118X1T-4FZ Winding resistance (Ω)Red-Black White-Black
(at 20°C) 3,17 5,18
Output (Rated) 18W, 6pole, 1phase, 220/230/240V, 50Hz
2 Fan motor (for outdoor) UE6-21SJ5P Winding resistance (Ω)Red-Black White-Black
(at 20°C) 370 370
3Running capacitor SK-50CMP AC 500V, 1,5µF
(for fan motor)
4Running capacitor SK-40CMP25U1 AC 400V, 25µF
(for compressor)
5Solenoid coil VAV-01A1501A1 AC 200/240V
(for 4-way valve)

– 10 –
No. Parts name Type Specifications
1 Fan motor (for indoor) TICF-35-19-3 DC 35V, 19W
2Thermo sensor (microprocessor) 10kΩat 25°C
(TA-sensor)
3 DC-DC transformer (T01) SWT-34 DC 390V, Secondary DC 35V, 12V, 7V
4 Microcomputer TMP87CK40F
5Power relay (RY01), DI1U Coil : DC 12V 75mA, Rated AC 250V 20A
Common relay (RY02)
6Heat exchanger sensor (microprocessor) 10kΩat 25°C
(TC-sensor)
7 Line filter (L01) RF-103YOR6 10mH, AC 0,6A
8 Diode (DB01) RBV-406 4A, 600V
9 Capacitor (C02) CEAUF2W101M20 100µF, 450V
10 Fuse (F01) MT3 T3,15A, 250V
11 Relay (for outdoor fan motor, AJQ1341 Coil DC 12V, 33mA, Rated 1A, AC 250V
solenoid coil) (RY03, RY04)
12 Power supply IC (IC01) MA2830-FJ 4A, 600V
13 Varistor (R21, R109) 15G561K 560V
14 Resistor (R01) ERF-5TK5R6 5,6 Ω, 5W
15 Current trans (T02) CT422920S-01
16 Louver motor MP35EA7 Output (Rated) 2W, 10poles, 1phase, DC 12V
No. Parts name Type Specifications
Output (Rated) 1100W, 2poles, 1phase, 220/230/240V, 50Hz
1 Compressor PA160X2T-4FM Winding resistance (Ω)Red-Black White-Black
(at 20°C) 2,26 3,53
Output (Rated) 28W, 6poles, 1phase, 220/230/240V, 50Hz
2 Fan motor (for outdoor) AF-230-28P Winding resistance (Ω)Red-Black White-Black
(at 20°C) 198 160
3Running capacitor SK-50FMP AC 500V, 1,5µF
(for fan motor)
4Running capacitor SK-40CMP35U1 AC 400V, 35µF
(for compressor)
5Solenoid coil VHV-01A1501A1 AC 200/240V
(for 4-way valve)
4-3. Indoor Unit
RAS-13SKH-ES
4-4. Outdoor Unit
RAS-13SAH-ES

– 11 –
Standard pressure Surface temp. of heat
P exchanger interchanging Fan speed
50Hz (MPaG) pipe T1 (°C) (indoor)
RAS-10SKH-ES RAS-10SKH-ES
Standard 2,5 40,0 High
Heating High temperature*1 3,1 ~ 3,6 51,0 ~ 58 Low
Low temperature 2,2 36,0 High
Standard 0,9 10,0 High
Cooling High temperature 1,1 16,0 High
Low temperature 0,6 2,0 Low
5. REFRIGERANT CYCLE DIAGRAM
RAS-10SKH-ES/RAS-10SAH-ES
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.
Evaporator
Indoor unit
Cross flow fan
Cooling Heating
4-way valve
Heating Cooling Compressor
Accumulator
Condenser
Propeller fan
Outdoor unit
Dryer Capillary tube
ø0,8x400
PA118X1T-4FZ
Cooling
Heating Mark( )means check points of Gas Leak
O.D.:9,52mm O.D.:6,35mm
Cooling
Heating
Packed valve
(ø9,52) Packed valve (ø6,35)
0,39m
(Connecting pipe)
ø9,52
0,49m
(Connecting pipe)
ø6,35
T1
P
Refrigerant
R-410A 0,69kg
Capillary tube
ø1,2x400
Muffler Muffler
Ambient temp.
conditions DB/WB
(°C)
Indoor Outdoor
20/– 7/6
27/– 21/15
20/– –10/–10
27/19 35/24
32/23 43/26
21/15 21/15

– 12 –
RAS-13SKH-ES/RAS-13SAH-ES
Heat exchanger
Indoor unit
Cross flow fan
Gas container connection (Reinstall etc.)
Heating
4-way valve
Heating Cooling Compressor
Condenser
Propeller fan
Outdoor unit
Capillary tube
ø1,5x500
Cooling
Cooling
Mark ( ) means check points of Gas Leak
O.D.:9,52mm O.D.:6,35mm
Cooling
Heating
Packed valve
(ø9,52) Packed valve (ø6,35)
0,49m
(Connecting pipe)
ø9,52
0,39m
(Connecting pipe)
ø6,35
(Note)
Maximum pipe length is 15m
Maximum pipe head is 6m
T1
P
Capillary tube
ø1,2x1200
Heating
Refrigerant
R-410A 0,80kg
PA160X2T-4FM
Muffler
Dryer
Standard pressure Surface temp. of heat
P exchanger interchanging Fan speed
50Hz (MPaG) pipe T1 (°C) (indoor)
RAS-13SKH-ES RAS-13SKH-ES
Standard 2,7 43,0 High
Heating High temperature*1 3,2 ~ 3,6 52,0 ~ 57,0 Low
Low temperature 2,0 30,0 High
Standard 0,9 11,0 High
Cooling High temperature 1,0 14,0 High
Low temperature 0,6 2,0 Low
Ambient temp.
conditions DB/WB
(°C)
Indoor Outdoor
20/– 7/6
27/– 21/15
20/– –10/–10
27/19 35/24
32/23 43/26
21/15 21/15
Note :
• Measure the heat exchanger temperature at the center of U-bend.(By means of TC sensor.)
*1 • During heating overload, the high temperature limit control operation is included.

– 13 –
6. MICRO-COMPUTER BLOCK DIAGRAM
Infrared Rays Signal Receiver
Current Sensor
Thermo. Sensor
Functions • Louver Control • 3-minutes Delay at Restart for Compressor • Motor Revolution Control • Processing (Temperature Processing) • Timer
ECONO.
Louver Direction Setting
Louver AUTO Swing
OFF TIMER Setting
ON TIMER Setting
Fan Speed Selection
Thermo. Setting
Operation Mode Selection
AUTO, COOL, DRY, HEAT, FAN ONLY
Operation (START/STOP)
Relay Driver, Louver Driver
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
PRE-DEF.
Sign Display
Indoor
Fan Motor
Louver
ON/OFF Signal
4-Way Valve
ON/OFF Signal
Outdoor Fan
ON/OFF Signal
Compressor
ON/OFF Signal
RelayRelayRelay
4-Way ValveOutdoor Fan Motor
Louver
Motor
Compressor
(Compressor Current)
RelayRY02
RY01 RY03 RY04
Noise Filter
Power Supply
Circuit

– 14 –
7. OPERATION DESCRIPTIONS
7-1. FAN ONLY Operation
(MODE of the remote control : FAN ONLY)
(1) During this mode, the relay RY01 is always turned
off so that only the indoor fan is operated.RY02
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 inTable 7-1-1.
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.
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
Indication of HIGH Air volume
FAN SPEED (m3/hr)
RAS-10SKH-ES RAS-13SKH-ES
LOW 400 510
MED 500 560
HIGH 600 650
HIGH
MED
LOW(+)
LOW
LOW
28
27
26
25
24
(Room temp. – Set temp.)
Set
temp.
Fig. 7-2-1
(2) Relays RY01 and RY02 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 inTable 7-1-1.
(Room temp. – Set temp.)
+1
0
Set
temp.
ON
OFF
4-way valve
(RY04)
Outdoor fan
(RY03)
OPERATION
display
ON
OFF
OFF
ON ON
Compressor
(RY01)
Common relay
(RY02)
(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
(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.

– 15 –
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.
OFF ON
+3
+2
+1
0OFF
4-way valve
(RY04)
Outdoor fan
(RY03)
OPERATION
display
Compressor
(RY01)
Common relay
(RY02)
ON:6min. OFF:4min.
ON:5min. OFF:5min.
OFF
ON:6min. OFF:4min.
ON:5min. OFF:5min.
ON
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 microcom-
puter, the louvers will be set to the position
automatically at the next operation.
(2) When the AUTO button is pushed, the louver ver-
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.
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.
• Theindoorfan will operatein the AUTOposition.
(2) The pattern of operation depending on the relation
between room temperature and set temperature
is shown below:
Fig. 7-3-2

– 16 –
0
–1 ON
OFF
ON
OFF
ON
ON ON
(Room temp. – Set temp.)
4-way valve
(RY04)
Outdoor fan
(RY03)
OPERATION
display
Compressor
(RY01)
Common relay
(RY02)
(Room temp. – Set temp.)
0
-1
-2
-3
-4
Set
temp.
MED
RY01 OFF
MED( - )
LOW(+)
LOW
FAN
Manual
AUTO
According
to the set
position
7-4. HEAT Operation
(MODE of the remote control : HEAT)
(1) Relays compressor 4-way valve, outdoor fan and
operation display are controlled as shown in Fig.
7-4-1.
Fig. 7-4-1
(2) Relays RY01 and RY02 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 inTable 7-1-1, when the FAN is set to LOW,
MED, or HIGH.
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.
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 AUTO button is pushed, the louver ver-
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.

– 17 –
7-5-1. Temporary Auto
When the TEMPORARY button is pushed, the set
temperature is fixed at 24°C and controlled in accor-
dance with the chart shown in Fig.7-5-1.
Fig. 7-5-1
Cooling mode
Cooling mode
Fan only mode
Heating mode
+4
+1
–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)
(Only the indoor fan operates at Low speed)
(The same heating mode as the room temperature control is set at set temp. +1˚C)
(Room temp. – Set temp.)
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 tempera-
ture reaches a level at which another mode is se-
lected.

– 18 –
7-6. ECONO. Mode
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
7-7. Current Limit Control
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).
Fig. 7-6-2
+2
+1
Set temp.
1H 2H TIME0H
(˚C)
ECONO. button
is pushed
Set temp.
is changed
Set temp.
is changed
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
-1
-2
Set temp.
1H 2H TIME0H
(˚C)
ECONO. button
is pushed
Set temp.
is changed
Set temp.
is changed
10A I 4
Input
current
9A I 3
Compressor Outdoor fan
More than I
4 continues for 3 seconds
OFF
More than I 3 continues for 5 minutes
OFF
ON
Fig. 7-7-1
(2) Current limit control (Heating)
Control is performed as shown in Fig.7-7-2.
10A I 4
Input
current
9A I 3
8A I 2
Compressor Outdoor fan
More than I
4 continues for 3 seconds
OFF
More than I 3 continues for 5 minutes
OFF
ON OFF
ON
7.5A I 1
Fig. 7-7-2

– 19 –
7-8. High-Temperature Limit 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.
7-10. Cool Airflow Prevention Control
(Heating 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 and
7-10-2.
RAS-10SKH-ES
60
53
52
(˚C)
Compressor,
Outdoor fan
OFF
ON
* 1 ····· Only outdoor fan is turned off.
* 1
Heat exchanger
temperature
Fig. 7-8-1
7-9. 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.7-9-1 and 7-9-
2.
RAS-10SKH-ES
Fig. 7-9-2
Fig. 7-9-1
RAS-13SKH-ES
Compressor
Less than 5˚C continues
for 5 minutes
OFF
ON
Outdoor fan
7
Heat exchanger
temperature
5
(˚C)
Compressor
Less than 2˚C continues
for 5 minutes
OFF
ON
Outdoor fan
6
Heat exchanger
temperature
2
(˚C)
According to the
set position
Indoor fan speed
30
25
20
Heat exchanger
temperature
(˚C)
U.L. (Ultra Low)
Room temp.
Set temp.
S.L (Super Low)
Room temp.
Set temp.
OFF
> <
Fig. 7-10-1
RAS-13SKH-ES
According to the
set position
Indoor fan speed
35
32
30
20
Heat exchanger
temperature
(˚C)
U.L. (Ultra Low)
Room temp.
Set temp.
S.L (Super Low)
Room temp.
Set temp.
OFF
> <
Fig. 7-10-2
(2) As soon as the defrost operation starts, the indoor
fan stops.

– 20 –
7-11. Defrost Operation
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 example 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.
Fig. 7-11-1 (Indoor fan speed : M)
7-11-2. Defrost OperationTime 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.)
minutes
40 minutes 40 minutes 40 minutes 40
Max 6 minutes 10 minutes
1 cycle
Heating Heating Heating Heating
Defrost Defrost Defrost Defrost
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 opera-
tion 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.
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 inter-
locked with the PRE-DEF. lamp. So the PRE-
DEF.lamp is off (the fans stop) for about 3 min-
utes after the START/STOP button is turned
on. When the compressor is turned on, the
PRE-DEF. lamp comes on. After the heat ex-
changer is preheated to about 30°C or higher,
the PRE-DEF.lamp goes off, and the indoor fan
starts.
Cumulative
compressor
operation time
40 90
Indoor heat exchanger temp. –Room temp.
AB
D
C
(˚C)
19
10
(
min.
)