Toshiba RAS-18SKPX User manual

Revised May, 2008
FILE NO. SVM-08032-1
SERVICE MANUAL
AIR CONDITIONER
SPLIT WALL TYPE
24 Class18 Class
RAS-18SKPX / RAS-18S2AX
RAS-24SKPX / RAS-24S2AX
RAS-18SKPX-V / RAS-18S2AX-V
RAS-18SKP-E / RAS-18S2A-E
RAS-24SKP-E / RAS-24S2A-E

– 1 –
FILE NO. SVM-08032
CONTENTS
1. SPECIFICATIONS
2. CONSTRUCTIONVIEWS
2-1 Indoor Unit
2-2 Outdoor Unit (18Class)
2-3 Outdoor Unit (24Class)
3. WIRING DIAGRAM
3-1
3-2
RAS-18SKPX / RAS-18S2AX, RAS-18SKPX-V / RAS-18S2AX-V,
RAS-24SKPX / RAS-24S2AX, RAS-24SKP-E / RAS-24S2A-E
4. SPECIFICATION OF ELECTRICAL PARTS
4-1 Indoor Unit (RAS-18SKPX, RAS-18SKPX-V, RAS-18SKP-E)
4-2
4-3 Outdoor Unit (RAS-18S2AX, RAS-18S2AX-V, RAS-18S2A-E)
4-4 Indoor Unit (RAS-24SKPX, RAS-24SKP-E)
Outdoor Unit (RAS-24S2AX, RAS-24S2A-E)
5. REFRIGERATION CYCLE DIAGRAM
5-1
5-2
RAS-18SKPX / RAS-18S2AX, RAS-18SKPX-V / RAS-18S2AX-V
RAS-24SKPX / RAS-24S2AX, RAS-24SKP-E / RAS-24S2A-E
6. CONTROL BLOCK DIAGRAM
7. OPERATION DESCRIPTION
7-2Outline of Air Conditioner Control
7-3Description of Operation Circuit
7-4Description of Safety and Reliability Prevention Function
7-5One-Touch Operation
7-6Hi POWER Operation
7-7QUIET Operation
7-8ECO Operation
7-9COMFORT SLEEP Operation
7-10 FILTER Check lamp
7-1 Remote control
7-11 Auto Restart Function
7-12 Self-Cleaning Operation
RAS-18SKP-E / RAS-18S2A-E
RAS-18SKP-E / RAS-18S2A-E

−2 −
FILE NO. SVM-08032
8. INSTALLATION PROCEDURE
8-1 Safety Cautions
8-2 Installation Diagram of Indoor and Outdoor Units
8-3 Installation
8-4 Indoor Unit
8-5 Outdoor Unit
8-6 Test Operation
9. TROUBLESHOOTING CHART
9-1 Troubleshooting Procedure
9-2 Basic Check Items
9-3 Primary Judgement
9-4 Self-Diagnosis by Remote Control (Check Code)
9-5Troubleshooting for Indoor Unit
9-6Troubleshooting for Wiring (Interconnect cable and Serial Signal Wire)
9-7Troubleshooting for P.C. Board
9-8Troubleshooting for Remote Control
10. PARTS REPLACEMENT
10-1 Indoor Unit
10-2
10-3 Outdoor Unit (RAS-18S2AX, RAS-18S2AX-V, RAS-18S2A-E) Outdoor Unit (RAS-24S2AX, RAS-24S2A-E)
11. EXPLODEDVIEWS AND PARTS LIST
11-1 Indoor Unit (E - Parts Assy)
11-2 Indoor Unit
11-3
11-4
Outdoor Unit (RAS-18S2AX, RAS-18S2AX-V, RAS-18S2A-E)
Outdoor Unit (RAS-24S2AX, RAS-24S2A-E)

- 3-
FILE NO. SVM-08032
MODEL RAS-18SKPX / RAS-18S2AX RAS-18SKPX-V
RAS-18SKP-E / RAS-18S2A-E RAS-18S2AX-V
ITEM Cooling Cooling
Capacity kW 220 V 240 V 220 V 240 V
5.20 5.25 5.20 5.25
Phase 1∅
Power source V220 – 240
Hz 50
Power consumption W1860 194018601940
Power factor %97 91 9791
Running current A0.3/8.80 0.3/9.00 0.3/8.80 0.3/9.00
Indoor/Outdoor
Starting current A42
Moisture removal lit/h 2
Noise Indoor (H/M/L) dB
Outdoor (220 – 240 V) dB 51 52 51 52
Refrigerant Name of refrigerant R22
Rated amount kg 1.23
Refrigerant control Capillary tube
Gas side size mm ∅12.7
Connection type Flare connection
Liquid side size mm ∅6.35
Interconnection Connection type Flare connection
pipe Maximum length m15*1
(One way) 20*2
Maximum height m8
difference
INDOOR UNIT RAS-18SKPX, RAS-18SKP-E RAS-18SKPX-V
Height mm 320
Dimensions Width mm1050
Depth mm228
Net weight kg 14
Evaporator type Finned tube
Indoor fan type Cross flow fan
High fan m3/h 900
Air volume Medium fan m3/h 800
Low fan m3/h 700
Fan motor output W30
Air filter Honeycomb woven filter with PP frame
OUTDOOR UNIT RAS-18S2AX, RAS-18S2A-E RAS-18S2AX-V
Height mm
Dimensions Width mm
Depth mm
Net weight kg 39
Condenser type Finned tube
Outdoor fan type Propeller fan
Airflow volume m3/h
Fan motor output W42
Compressor Model
Output W
Safety device IOL
Louver type Automatic louver
Usable outdoor temperature range °C 21 ~ 43
SHX33SC4-U
42/39/37/35/33
Note *1 Chargeless pipe
*2 Maximum pipe
2350
2350 2450
550
780
290
1500
2450
1. SPECIFICATIONS

– 4–
FILE NO. SVM-08032
MODEL
RAS-24SKPX
RAS-24SKP-E
RAS-24S2A-E
ITEM Cooling Cooling
Capacity kW
220 V 240 V 220 V 240 V
6.40 6.45 6.40 6.45
Phase 1∅
Power source V220 – 240
Hz 50
Power consumption W2280 236022802360
Power factor %9888 9888
Running current A0.3/10.30.3/10.9 0.3/10.30.3/10.9
Indoor/Outdoor
Starting current A
Moisture removal lit/h
Noise
Indoor (H/M/L) dB 45/43/41/39/37
Outdoor (220 – 240 V) dB 56-57
Refrigerant Name of refrigerant R22
Rated amount kg
Refrigerant control Capillary tube
Gas side size mm ∅15.88
Connection type Flare connection
Liquid side size mm ∅6.35
Interconnection Connection type Flare connection
pipe Maximum length m 15*1
(One way)
Maximum height m10
difference
INDOOR UNIT RAS-24SKPX RAS-24SKP-E
Height mm 320
Dimensions Width mm1050
Depth mm228
Net weight kg 13
Evaporator type Finned tube
Indoor fan type Cross flow fan
High fan m3/h 1100
Air volume Medium fan m3/h
Low fan m3/h
Fan motor output W
Air filter Honeycomb woven filter with PP frame
OUTDOOR UNIT RAS-24S2AX RAS-24S2A-E
Height mm 715
Dimensions Width mm780
Depth mm290
Netweight kg52
Condenser type Finned tube
Outdoor fan type Propeller fan
Airflow volume m3/h 2550 2400 2550
Fan motor output W42
Compressor Model
Output W1800
Safety device IOL
Louver type Automatic louver
Usable outdoor temperature range °C 21 ~ 43
RAS-24S2AX
1.86
2400
PH400X3CS-4KT1
2.7
950
850
30
25*2
67

– 5 –
FILE NO. SVM-08032-1
Note : 1
•Capacity is based on the following temperature conditions.
Note : 2
•Charge refrigerant according to the table below.
Refrigerant
RAS-18SKPX / RAS-18S2AX
*1 No need to charge 15 m or less 15 m or less
extra refrigerant
*2 Need to charge Over 15 m up to 25 m (30 g/m) Over 15 m up to 20 m (20 g/m)
extra refrigerant
Temperature Condition JIS C9612
Cooling
Indoor unit inlet air temperature (DB) 27°C
(WB) 19°C
Outdoor unit inlet air temperature (DB) 35°C
(WB) 24°C
RAS-24SKPX / RAS-24S2AX RAS-18SKPX-V / RAS-18S2AX-V
RAS-24SKP-E / RAS-24S2A-E RAS-18SKP-E / RAS-18S2A-E

– 6 –
2.CONSTRUCTIONVIEWS
2-1. Indoor Unit
FILE NO. SVM-08032
65
262.5
40
262.5
215 235 215
235
320
40
10947 215.5 153.5
85 23
65
73.57
200
525
278 200 222 150
Air filter
Heat exchanger
Air inlet
Air outlet
1050
320
6)
Hanger 8~
Hanger Hanger
Center line
10)
Installation plate outline
For stud bold (
For stud bold (
Outline of indoor unit
786
72 78
50 50
78 72
Front Panel
Grille Inlet
Knock out system
50
Knock out system
73.5
50
228
7
Drain hose (0.5m)
12.70)
Connecting pipe (0.39m) Connecting pipe (0.49m)
6.35)(Flare
Hanger
(For 24 Series ; Flare 15.88)
(For 18 Series ; Flare
Hanger
132
19
157
Wireless remote controller
56
Remote controller holder
26
125
63

–7–
FILE NO. SVM-08032-1
320
306
Z View
600
A detail Drawing (Back leg)
320
306
Ø 25 Drain outlet 11 x 14 Hole
(For 8 - 10 anchor bolt)
B Detail Drawing (Front leg)
FAN-GUARD
COVER-PV
Electrical part cover
Liquid side
(Flare 6.35)
Ø
Ø
Gas side
(Flare 12.7)
Service port
4x 11 Long holes(For 8- 10 anchor bolt)
Installation dimension
Air outlel
100 or more
100 or more
600 or more
600 or more
Air intlel
ØØØ
Ø6 hole
86
Ø6 hole
Ø11x14 hole
R15
32.5 A
320
R5.5
36
108125
50
129
84
54
600
320
9060090
275
290
550
Ø436
Z
R15
50
36
-
2
320
342
69
ØØØ
2-2. Outdoor Unit(18 Class)

–8–
FILE NO. SVM-08032-1
HANDLE
COVER-PV
HANDLE
600
Z View Service port
320
306
A Detail Drawing (Back leg) Ø
25 Drain outlet
2Ø11x14 Hole
(For Ø8-Ø10 anchor bolt) B
Ø6Hole
Ø11x14 Hole
50
36 R15
R
5.5
Ø6 hole
32.5
320
86
A
125108
600 or more
Air out
let
320
600
Air inlet
4xØ11 Long holes(ForØ8-Ø10 anchor bolt)
Gas-side
(Flare Ø15.88)
Liquid side
(Flare Ø6.35)
90 600 90 69 342
320
Z
50
36 R15
B Detail Drawing (Front leg)
Ø436
FAN-GUARD
715
290
275
600 or more
84
129
54
Electrical part cover
320
306
100 or more
100 or more
Installation dimension
2-3. Outdoor Unit (24 Class)

– 9–
FILE NO. SVM-08032
3.1. RAS-18SKPX / RAS-18S2AX, RAS-18SKPX-V / RAS-18S2AX-V,
3. WIRING DIAGRAM
5
CN10
1
3
55
3
1
CN11
22
1
33
1
4
5
4
3
2
11
2
3
4
5
3
CN07
2
11
2
3
4
5
Louver motor
FAN motor
CN03
CN01
2
1
2
1
1
2
1
2
Thermo Sensor(TA)
Heat Exchanger
Sensor(TC)
C07
+
C27
WP-018
DB01
BLK
P04
SG01
DSA
R63
R62
F01
6.3A
250VAC
L01
C25 C26
AC Motor
IC03
12V
MCU
4
31
2
R64
RY02
MCC-5044
COLOR IDENTIFICATION
BRW : BROWN
RED : RED
WHI : WHITE
YEL : YELLOW
BLU : BLUE
BLK : BLACK
GRY : GRAY
GRN&YEL : GREEN&YELLOW
3
12
i
RED
GRY
RED
BLK
BLK
BLK
GRN&YEL
CHASSIS
MAGNETIC
CONTACTOR
A1
A2
UVW
RST
SPARK KILLER
FAN MOTOR
WHI BLK
RED
RED
CAPACITOR
WHI BLK
PNK
S
R
C
(or A)
(or B)
3
12
CAPACITOR
COMPRESSOR
RED
INDOOR
TERMINAL
BLOCK
OUTDOOR
TERMINAL
BLOCK
INDOOR
UNIT
OUTDOOR
UNIT
POWER SUPPLY
220-240V~ 50Hz
RED
BLK
LN
RAS-18SKP-E / RAS-18S2A-E

–10–
FILE NO. SVM-08032
3-2.RAS-24SKPX / RAS-24S2AX, RAS-24SKP-E / RAS-24S2A-E
LN
i
RED
RED
CHASSIS
GRY
POWER SUPPLY
220-240V~ 50 Hz
SPARK KILLER
MAGNETIC CONTACTOR
BLK BLK
RED
A2 A1
52C
1/L1 2/T1
3/L2 4/T2
5/L3 6/T3
COMPRESSOR
WHI
PNK BLK
C
S
R
CAPACITOR
CAPACITOR
WHI
RED
F AN MO T OR
B L K
RED
RED
3
12
3
12
BLK
BLK
OUTDOOR
TERMINAL
BLOCK
OUTDOOR
UNIT
GRN&YEL

4. SPECIFICATION OF ELECTRICAL PARTS
4-1. Indoor Unit (RAS-18SKPX, RAS-18SKPX-V, RAS-18SKP-E)
No. Parts name Type Specifications
1Fan motor (for indoor) AFS-220-31-4A AC 200 − 240V, 31W
2 Thermo sensor (TA-sensor) ——— 10 kΩat 25°C
3Switching Transformer (T01) ST-001
4Microcontroller TMP87CM40ANG-6P68
5 Heat exchanger sensor ——— 10 kΩat 25°C
(TC-sensor)
6Line filter (L01) LC*SS11V-06270 27mH, 600mA
7Diode (DB01) DB105G 1A, 600 V
8Capacitor (C27)EKMH401VSN470MP20S 47 µF, 400 V
9Fuse (F01) FJL250V6.3A T6.3 A, 250 V
10Varistor (R62, R63)SR561K14DL 560 V
11 Resistor (R64)RF-2TK5R6 5.6Ω, 2W
12 Louver motor MP24Z3T Output (Rated) 2 W, 6poles, 1-2 phase,
DC 12 V
–11 –
FILE NO. SVM-08032
4-2.Outdoor Unit (RAS-18S2AX, RAS-18S2AX-V, RAS-18S2A-E)
No. Parts name Type Specifications
Output (Rated) 1500 W, 2 poles, 1 phase, 220-240V~, 50 Hz
1Compressor SHX33SC4-U Winding resistance (Ω)C-R C-S
(at 20°C) 1.472.88
Output (Rated) 42 W, 6 poles, 1 phase, 220 – 240 V~, 50 Hz
2Fan motor (for outdoor) WLF-240-42A-1 Winding resistance (Ω)Red-BlackWhite-Black
(at 20°C) 188 289
3Running capacitor AC450V~, 2.0µF
(for fan motor)
4Running capacitor RS44B506U0218S AC440V~, 50µF
(for compressor)
5Magnetic contactor CLK-26J 220-240V~, 50 Hz
DS451205NPQB

-12 -
4-3. Indoor (RAS-24SKPX, RAS-24SKP-E)
No. Parts name Type Specifications
13 G5NB-1A
Relay : (RY03)Coil DC 12V, 16.7mA, Contact AC 250V, 1A
FILE NO. SVM-08032
1Fan motor (for indoor) ICF-340-30-2BAC 200 − 240V, 30W
2 Thermo sensor (TA-sensor) ——— 10 kΩat 25°C
3Switching Transformer (T01) SWT-77 DC7V, 12 V
4Microcontroller TMP87CM40ANG-6P68
5 Heat exchanger sensor ——— 10 kΩat 25°C
(TC-sensor)
6Line filter (L01) LC*SS11V-06270 27mH, 600mA
7 Diode (DB01) D3SBA60 4 A, 600 V
8Capacitor (C03)EKMH451VSN121MQ35S 120 µF, 450 V
9Fuse (F01) BET6.3A T6.3 A, 250 V
10Varistor (R09, R10)SR561K14DL 560 V
11 Resistor (R01)RF-5TK1R8 1.8Ω, 5W
12 Louver motor MP24Z3T Output (Rated) 2 W, 6poles, 1-2 phase,
DC 12 V
4-4.Outdoor Unit (RAS-24S2AX, RAS-S2A-E)
No. Parts name Type Specifications
Output (Rated) 2200 W, 2 poles, 1 phase, 220 −240V~, 50Hz
1Compressor PH400X3CS-4KT1 Winding resistance (Ω)C-R C-S
(at 20 °C)
Output (Rated) 42 W, 4poles, 1 phase
Winding resistance (Ω)Red-BlackWhite-Black
2 Fan motor (for outdoor) (at 20°C)
128 126
FG-240-42A
AC440V~,50µF
3Running capacitor DS451305NPQB AC450V~, 3.0µF
(for fan motor)
RS44B506U0218S
4
5Magnetic contactor A35 220-240V~, 50 Hz
Running capacitor
(for compressor)
1.13 2.10
, 220 −240V~, 50Hz

–13–
FILE NO. SVM-08032
5-1. RAS-18SKPX / RAS-18S2AX, RAS-18SKPX-V / RAS-18S2AX-V
RAS-18SKP-E / RAS-18S2A-E
Note : Measure the heat exchanger temperature at the center of U-bend. (By means of TC sensor.)
Ambient temp.
conditions DB/WB
(°C)
Indoor Outdoor
Standard 0.4612.5 High 27/19 35/24
Cooling High temperature 0.5117.5 High 32/23 43/26
Low temperature 0.32 6.5 Low21/15 21/15
Fan speed
(indoor)
50 Hz Standard
pressure
P
(MPaG)
Cross flow fan
Compressor
Propeller fan
Outdoor unit
SHX33SC4-U
O.D.:12.7 mm O.D.:6.35 mm
Packed valve
(∅12.7) Packed valve (∅6.35)
T
P
Refrigerant
R22 1.23 kg
0.39 m
(Connecting pipe)
∅12.7
0.49 m
(Connecting pipe)
∅6.35
Mark ( ) means check points of Gas Leak
Capillary tube
∅2.0x1100 s
Surface temp. of heat
exchanger interchanging
pipe
T
(°C)
Heat exchanger
Heat exchanger
Discharge Muffler
∅ 25x160L
5. REFRIGERATION CYCLE DIAGRAM

–14–
FILE NO. SVM-08032
5-2. RAS-24SKPX / RAS-24S2AX
Note : Measure the heat exchanger temperature at the center of U-bend. (By means of TC sensor.)
Ambient temp.
conditions DB/WB
(°C)
Indoor Outdoor
Standard 0.43 11.5 High 27/19 35/24
Cooling High temperature 0.56 14.4High 32/23 43/26
Low temperature 0.334.0 Low21/15 21/15
Fan speed
(indoor)
50 Hz Standard
pressure
P
(MPaG)
Heat exchanger
Indoor unit
Cross flow fan
Cooling
Propeller fan
Outdoor unit
PH400X3CS-4KT1
Cooling
O.D.:15.88 mm O.D.:6.35 mm
Cooling
Gas container connection (Reinstall etc.)
Packed valve
( ∅ 6.35)
Packed valve
( ∅ 15.88)
0.39 m
(Connecting pipe)
∅ 15.88
0.49 m
(Connecting pipe)
∅ 6.35
T
P
Refrigerant
R22 1.86 kg
Compressor
Mark ( ) means check points of Gas Leak
Capillary tube
∅2.0x800 s
Surface temp. of heat
exchanger interchanging
pipe
T
(°C)
RAS-24SKP-E / RAS-24S2A-E
Discharge Muffler
∅ 25x160L
Heat exchanger

– 15 –
FILE NO. SVM-08032
6. CONTROL BLOCK DIAGRAM
REMOTE CONTROL
Heat Exchanger Sensor
Outdoor Unit
Outdoor unit
ON/OFF Signal
Relay Driver
Indoor Unit Control Panel
Temperature Sensor
Infrared Rays Signal Receiver
Initiallizing Circuit
Clock Frequency
Oscillator Circuit
Power Supply
Circuit
Noise Filter
From Outdoor Unit
240 V AC 50 Hz
M.C.U.
Functions
•Louver Control
•3-minute Delay at Restart for Compressor
•Motor Revolution Control
•Processing
•Timer
Louver ON/OFF Signal
Louver Driver
Operation
Display
Timer
Display
Filter Sign
Display
Fan Only
Sign Display
Indoor
Fan Motor
Hi Power
Sign Display
Louver Motor
Infrared
Rays
Remote
Control
(Temperature Processing)
Operation ( )Operation ( )
Remote Control
Operation Mode Selection
AUTO, COOL, DRY, FAN ONLY
Temperature Setting
Fan Speed Selection
ON TIMER Setting
OFF TIMER Setting
Louver Auto Swing
Louver Direction Setting
ECO
Hi power
TIMER 1.3.5.9H
Infrared Rays
COMFORT SLEEP
QUIET
Relay RY02 (for 18SKPX, 18SKPX-V and 18SKP-E)
or RY03 (for 24SKPX and 24SKP-E)

7. OPERATION DESCRIPTION
1111Infrared signal emitter
Start/Stop button
Mode select button (MODE)
18
Temperature button (TEMP)
3
4Fan speed button (FAN)
Swing louver button (SWING)
5
6Set louver button (FIX)
On timer button(ON)
7
Off timer button (OFF)
8
Sleep timer button (SLEEP)
10
19 Timer setup button (SET)
11 Timer clear button (CLR)
20
12 Memory and Preset button (PRESET)
One Touch button (ONE-TOUCH)
High power button (Hi-POWER)
Economy button (ECO)
21
Quiet button (QUIET)
Comfort sleep button (COMFORT SLEEP)
Filter reset button (FILTER)
Clock Reset button (CLOCK)
Check button (CHK)
1
2
9
7-1. Remote control
7-1-1. Function of Push Putton
18
17
16
15
14
13
20
19
13 PRESET
ONE-TOUCH
QUIET
SWING
TIMER
ON
FILTER CHK CLOCK
OFF
CLR
SLEEP SET
FIX Hi-POWER ECO
COMFORT
SLEEP
MODE
TEMP
FAN
1
14
2
17
6
7
8
10
21 11
19 20
9
12
16
15
18
3
4
5
-16-
FILE NO. SVM-08032

FILE NO. SVM-08032
−17 −
7-1-2.Display of Remote Control
All indications, except for the clock time indicator, are displayed by pressing the
1
7
button.
1. Transmission mark
This transmission mark indicates when the
remote controller transmits signals to the indoor
unit.
2. Mode indicator
Indicates the current operation mode.
A : Auto, : Cool, : Dry, : Fan only)
3. Temperature indicator
Indicates the temperature setting.
(17°C to 30°C)
9
, LOW
+
, MED , MED
+
,
HIGH ) can be shown.
Indicate Auto will be appear with Dry operation
5. TIMER and clock time indicator
The time setting for timer operation or the clock
time is indicated.
The current time is always indicated except
during TIMER operation.
6. Hi-POWER indicator
Indicates when the Hi-POWER operation starts.
Press the Hi-POWER button to start and press it
again to stop the operation.
7. (PRESET) indicator
Flashes for 3 seconds when the PRESET button is
pressed during operation.
8. ECO indicator
Indicates when the ECO is in activated.
Press the ECO button to start and press it again
to stop operation.
9. A, B change indicator remote controller
When the remote controller switching function is
set, “B”appears in the remote controller display.
(When the remote controller setting is “A”, there is
no indication at this position.)
Indicates when comfort sleep is activaled.
Press comfort sleep button to selector
Indicates when quiet is activated.
Press quiet button to start and press it again to stop
operation.
Indicates when one touch comfort is activated.
Press one-touch button to start the operation.
Indicates when louver is swing.
Press swing button to start the swing operation
and press it again to stop the swing operation.
10.Comfort sleep
11.Quiet
12.One-Touch
13.Swing
( : Dry) only.
4. FAN speed indicator
Indicates the selected fan speed.
AUTO or five fan speed levels
(LOW
The mark is shown when holding down the
button for more than 3 seconds while the mark is
blinks. Press another button to turn off the mark.
12
4
8
6
3
11
10
213
5

7-2-1. Louver control
(1) Vertical air flow louver
Position of veritcal air flow louver is automatically
controlled according to the operation mode.
Besides, position of vertical air flow louver can be
arbitrarily set by pressing [FIX] button.
The louver position which is set by [FIX] button is
stored in the microcomputer, and the louver is
automatically set at the stored position for the next
operation.
(2) Swing
If [SWING] button is pressed when the indoor unit
is in operation, the vertical air flow louver starts
swinging.When [SWING] button is pressed, it stops
swinging.
7-2-2. Indoor Fan Control
The operation controls the fan speed at indoor unit
side. The indoor fan (cross flow fan) is operated by
the phase control induction motor. The fan rotates in 5
stages in MANUAL mode, and in 5 stages in AUTO
mode, respectively. (Table 7-2-2)
1) When setting the fan speed to L, L+, M, M+ or H
on the remote controller, the operation is performed
with the constant speed show in Table 7-2-1
7-2.Outline of Air Conditioner Control
This is a fixed capacity type air conditioner, which uses
a AC motor (18K) and DC motor (24K) for an indoor
circuit is mounted in the indoor unit. And electrical
parts which operate the compressor and the outdoor
fan motor, are mounted in the outdoor unit.
The air conditioner is mainly controlled by the indoor
unit controller.The controller operates the indoor fan
motor based upon commands transmitted by the
remote control and transfers the operation commands
to the outdoor unit.
The outdoor unit receives operation commands
from the indoor unit, and operates the outdoor
fan motor and the compressor.
(1) Role of indoor unit controller
The indoor unit controller receives the operation
commands from the remote control and executes
them.
• Temperature measurement at the air inlet of the
indoor heat exchanger by the indoor
temperature sensor
•Temperature measurement of the indoor heat
exchanger by the heat exchanger sensor
•Louver motor control
•Indoor fan motor operation control
•LED display control
•Transferring of operation commands to the
outdoor unit
•Receiving of information of the operation status
and judging of the information or indication of
error
(2) Role of outdoor unit controller
The outdoor unit controller receives the operation
commands from the indoor controller and
executes them.
•Compressor operation
control
•Operation control of
outdoor fan motor
•Turning off the compressor and outdoor fan
when the outdoor unit receives the shutdown
command
Operations according
to the commands
from the indoor unit
L
L+
M
M+
H
Low
(L + M) / 2
Med
(M + H) / 2
High
Indication Fan speed
tp the setup temperature, room temperature, and heat
2) When setting the fan speed to AUTO on the remote
controller, revolution of the fan motor is controlled
to the fan speed level shown in Table 7-2-2 according
exchanger temperature.
Table (7-2-1)
HMLL- UL SL
HMLL-
MLL-ULSL
Dry
Fan only
Cooling
OPERATION
MODE
Table 7-2-2 Indoor fan and air flow rate
RAS-18SKPX-V
RAS-18SKPX
FILE NO. SVM-08032
1200
1000
1100
850
1125
950
1025
1050
950
750
1000
850
900
950
850
650
850
750
750
550
700
650
600
450
600
550
500
-18 -
L+
L+
L+
M+
M+
M+
FAN TAP
UH
fan. The AC motor (18K) and DC motor (24K) drive
rpm
Air flow volume (m3/h)
rpm
RAS-24SKP-E
RAS-24SKPX
900
800 700
800
900
RAS-18SKP-E Air flow volume (m3/h)
Model

7-3.Description of Operation Mode
(1) When turning on the breaker, the operation lamp
blinks.This means that the power is on (or the
power supply is cut off.)
(2) When pressing [ ] button on the remote control,
receiving beep sounds from the indoor unit,
and the next operation is performed together
with opening the vertical air flow louver.
(3) Once the operation mode is set, it is memorized in
the microcomputer so that the previous operation
can be effected the reafter simply by pressing
[] button.
7-3-1. Fan only operation
([MODE] button on the remote control is set
to the fan only operation.)
(1) When [FAN] button is set to AUTO, the indoor fan
motor operates as shown in Fig. 7-3-1.When
[FAN] button is set to LOW, LOW+, MED, MED+or
HIGH, the motor operates with a constant air flow.
7-3-2. Cooling operation
([MODE] button on the remote control is set
to the cooling operation.)
(1) The compressor,outdoor fan and operation display
lamp are controlled as shown in Fig. 7-3-2.
Fig. 7-3-2
(2) When [FAN] button is set to AUTO, the indoor fan
motor operates as shown in Fig. 7-3-3.When
[FAN] button is set to LOW, LOW+, MED, MED+or
HIGH, the motor operates with a constant air flow.
*1
*2
*3
+3
+2.5
+2
+1.5
+1
+0.5
-0.5
0
M+
Preset
temp.
°C
(Room temp.) −(Preset temp.)
0.5
0
Preset
temp.
ON ON
OFF OFF ON
Compressor
Outdoor fan
OPERATION
display lamp

(Room temp.) (Preset temp.)
(Preset temp.: 24 °C)
+2
+2.5
+3
°C
+1.5
+1
+0.5
0
M+
*1
*2
*3
(Room temp.) −(Preset temp.)
Preset
temp.
° C
operation can not be set
Fig. 7-3-1Setting of air flow [FAN:AUTO]
2: The Hi Power, ECO and COMFORT SLEEP
Fig. 7-3-3Setting of air flow [FAN:AUTO]
*2 : Fan speed = (M + −L) x 2/4 + L
NOTE 1 : *1 : Fan speed = (M + −L) x 3/4 + L
*3 : Fan speed = (M + −L) x 1/4 + L
*2 : Fan speed = (M + −L) x 2/4 + L
NOTE 1 : *1 : Fan speed = (M + −L) x 3/4 + L
*3 : Fan speed = (M + −L) x 1/4 + L
(Linear approximation from M+ and L)
(Linear approximation from M+ amd L)
FILE NO. SVM-08032
-19-