Toshiba RAS-24S2AH-ES2, RAS-24SA-ES2, RAS-24SKHP-ES2, RAS-24SKP-ES2 SERVICE MANUAL

SERVICE MANUAL

AIR CONDITIONER

RAS-24SKP-ES2 / RAS-24SA-ES2

RAS-24SKHP-ES2 / RAS-24S2AH-ES2

FILE NO. SVM-10049

SPLIT WALL TYPE

April, 2010

CONTENTS

1. SPECIFICATIONS

2. CONSTRUCTION VIEWS

2-1 Indoor Unit 2-2 Outdoor Unit

3. WIRING DIAGRAM

3-1 RAS-24SKP-ES2 / RAS-24SA-ES2 3-2 RAS-24SKHP-ES2 / RAS-24S2AH-ES2

4. SPECIFICATION OF ELECTRICAL PARTS

4-1 Indoor Unit (RAS-24SKP-ES2)

Outdoor Unit (RAS-24SA-ES2)

4-2 4-3

Indoor Unit (RASP-24SKHP-ES2) Outdoor Unit (RAS-24S2AH-ES2)

4-4

5. REFRIGERATION CYCLE DIAGRAM

FILE NO. SVM-10049

RAS-24SKP-ES2 / RAS-24SA-ES2

5-1

RAS-24SKHP-ES2 / RAS-24S2AH-ES2

5-2

6. CONTROL BLOCK DIAGRAM

6-1 RAS-24SKP-ES / RAS-24SA-ES2

6-2 RAS-24SKHP-ES2 / RAS-24S2AH-ES2

7. OPERATION DESCRIPTION

7-1 Remote control 7-2 Outline of Air Conditioner Control

7-3 Description of Operation Circuit 7-4 Description of Safety and Reliability Prevention Function 7-5 One-Touch Operation 7-6 Hi POWER Operation 7-7 QUIET Operation 7-8 ECO Operation 7-9 COMFORT SLEEP Operation

7-10 FILTER Check lamp

7-11 Auto Restart Function

7-12 Self-Cleaning Operation

– 1 –

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)

9-5 How To Diagnose Faulty Parts

Troubleshooting for Indoor unit

9-6 9-7 Troubleshooting for Wiring (Interconnect cable and Serial Signal Wire) 9-8 Troubleshooting for P.C. Board 9-9 Troubleshooting for Remote Control

FILE NO. SVM-10049

HOW TO REPLACE THE MAIN PARTS

10.

10-1 Indoor Unit

Outdoor Unit

10-2

11. EXPLODED VIEWS AND PARTS LIST

11-1 Indoor Unit (E - Parts Assy) 11-2 Indoor Unit 11-3

Outdoor Unit (RAS-24SA-ES2)

11-4

Outdoor Unit (RAS-24S2AH-ES2)

− 2 −

1. SPECIFICATIONS

MODEL RAS-24SKP-ES2

Cooling

ITEM

Capacity

kW

Phase

Power source

Hz Power consumption W Power factor % Running A Current Indoor/Outdoor Starting current A Moisture removal lit/h Noise Indoor (H/M+/M/L+/L) dB

Outdoor (220-240V) dB

Refrigerant Name of refrigerant

Rated amount kg Refrigerant control Interconnection Gas side size mm pipe Connection type

Liquid side size mm

Connection type

Maximum length m

(One way)

Maximum height m

difference

INDOOR UNIT

Dimensions Height mm

Width mm

Depth mm Net weight kg Evaporator type Indoor fan type Airflow volume High fan

Medium fan

Low fan

3

m

3

m

3

m Fan motor output W Air filter

OUTDOOR UNIT

Dimensions Height mm

Width mm

Depth mm Net weight kg Condenser type Outdoor fan type Airflow volume

3

m Fan motor output W Compressor Model

Output W Safety device Louver type Usable outdoor temperature range °C

Note *1 Chargeless pipe

*2 Maximum pipe

V

/h /h /h

/h

220V

6.80

2030

98

0.3/9.1 0.3/8.6

56

Honeycomb woven filter with PP frame

4000

FILE NO. SVM-10049

RAS--24SA-ES2

1∅

220 - 240

50

55

2.7

50/48/46/43/40

R410A

1.90

Capillary tube

∅12.7

Flare connection

∅6.35

Flare connection

RAS-24SKP-ES2

RAS-24SA-ES2

PA271X3CS-4MUL

Automatic louver

1

15*

2

25*

10

320

1050

228

13

Finned tube

Cross flow fan

1240

1000

850

30

890 900 320

59

Finned tube

Propeller fan

85

2000

Fuse , IOL

15 ~ 43

240V

6.85

2070

97

57

4200

− 3 −

FILE NO. SVM-10049

MODEL RAS-24SKHP-ES2

RAS-24S2AH-ES2

ITEM Cooling Heating

Capacity

kW

220V

6.78

Phase

Power source

V

Hz Power consumption W Power factor %

2030

98 96 Running Indoor A 0.30 Current Outdoor A 9.40 9.10 8.95 8.90 Starting current A Moisture removal lit/h Noise Indoor (H/M+/M/L+/L) dB

Outdoor (220-240V) dB

56-57

Refrigerant Name of refrigerant

Rated amount kg Refrigerant control Interconnection Gas side size mm pipe Connection type

Liquid side size mm

Connection type

Maximum length m

(One way)

Maximum height m

difference

INDOOR UNIT

Dimensions Height mm

Width mm

Depth mm Net weight kg Evaporator type Indoor fan type Airflow volume High fan

Medium fan

Low fan

3

m

/h

3

/h

m

3

m

/h

1240

1000

Fan motor output W Air filter

OUTDOOR UNIT

Dimensions Height mm

Width mm

Depth mm Net weight kg Condenser type Outdoor fan type Airflow volume

3

m

/h

4000 4200 4000 Fan motor output W Compressor Model

Output W Safety device Louver type Usable outdoor temperature range °C

15 ~ 43 -10 ~ 24

Note *1 Chargeless pipe

*2 Maximum pipe

240V 220V

6.82 7.28

1∅

220 - 240

50

2100 1930

98

55

2.7

50/48/46/43/40

R410A

2.00

Capillary tube

∅12.7

Flare connection

∅6.35

Flare connection

1

15*

2

25*

10

RAS-24SKHP-ES2

320

1050

228

14

Finned tube

Cross flow fan

30

Honeycomb woven filter with PP frame

RAS-24S2AH-ES2

890 900 320

64

Finned tube

Propeller fan

85

PA271X3CS-4MUL

2000

Fuse , IOL

Automatic louver

240V

7.32

2050

96

57-58

1240

1000

850850

4200

− 4 −

Note : 1

• Capacity is based on the following temperature conditions.

FILE NO. SVM-10049

Condition

Temperature

(DB) 27°C20°C

Indoor unit inlet air temperature

(WB) 19°C15°C

(DB) 35°C7°C

Outdoor unit inlet air temperature

(WB) 24°C6°C

Note : 2

• Charge refrigerant according to the table below.

Refrige rant

*1 No need to charge

extra refrigerant

*2 Need to charge

extra refrigerant

JIS C9612

Cooling Heating

RAS-24SKP-ES2 / RAS-24SA-ES2

RAS-24SKHP-ES2 / RAS-24S2AH-ES2

15 m or less

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

– 5 –

2-1. Indoor Unit

FILE NO. SVM-10049

2. CONSTRUCTION VIEWS

Grille Inlet

Front Panel

73.57

50

Knock out system

Heat exchanger

320

50

78 72

Air inlet

278 200 222 150

132

1050

Air outlet

200

Air filter

72 78

50

228

50

Knock out system

73.5

7

157

Drain hose (0.5m)

320

40

525

Hanger

Connecting pipe (0.39m)

12.70)

(Flare

85 23

Hanger

6

5

Hanger Hanger

262.5

786

235

215

Center line

Installation plate outline

Connecting pipe (0.49m)

235

215

262.5

Hanger

6.35)(Flare

For stud bold ( For stud bold (

6

5

10947 215.5 153.5

56

Wireless remote controller

63

Remote controller holder

6) 8~

10)

Outline of indoor unit

40

19

125

26

− 6 −

2-2. Outdoor Unit

FILE NO. SVM-10049

56.5

365

A Detail Drawing (Back leg)

600

R6

FAN-GUARD

890

365

Ø

547

Ø

A

113

25 Drain outlet

438

2- 12x17 Hole

Ø

525

365

12x17 Hole

Ø

B

HANDLE

B Detail Drawing (Front leg)

56.5

Z

PANEL-PIPING-BK

320

HANDLE

200 or more

320

150

Z View

600

Air inlet

150600

Service port

600 or more

365

400

Gas-side (Flare 12.70)

Liquid-side (Flare 6.35)

45

128

82

Ø

150 or more

Air outlet

1000 or more

Installation dimension

– 7 –

4x 17 Long holes

Ø

3. WIRING DIAGRAM

3-1. RAS-24SKP-ES2 / RAS-24SA-ES2

FILE NO. SVM-10049

OUTDOOR TERMINAL BLOCK

POWER SUPPLY 220 − 240 V ~ 50 Hz

L

N

BLK

RED

BLK

RED

MAGNETIC CONTACTOR

1

BLK BLK

SPARK KILLER

A2 A1

52C

1/L1 2/T1

6/T35/L3

2

RED

CAPACITOR

3

GRY

CHASSIS

RED

WHI PNK

COMPRESSOR

CAPACITOR

S

R

OUTDOOR

UNIT

BLK

C

WHI RED

FAN MOTOR

BLK

– 8 –

3-2. RAS-24SKHP-ES2 / RAS-24S2AH-ES2

FILE NO. SVM-10049

OUTDOOR TERMINAL BLOCK

POWER SUPPLY 220- 240 V ~ 50 Hz

L

BLK

RED

BLK

RED

WHI PNK

COMPRESSOR

2

1

3

GRN&YEL

2

5/L3

3

i

CHASSIS

A1

N

FERRITE CORE

RED

CONTACTOR

1/L1

1

MAGNETIC

52C

BLK

6/T3

A2

RED

WHI RED

FAN MOTOR

2/T1

CAPACITOR CAPACITOR

S

C

R

TRANSFORMER

OUTDOOR UNIT

BLK BLK

BLK

RED

BLK

WHI

RED

GRY

BLU

YEL

BLU

BLU COIL FOR 4 WAY VALVE

MAIN P.C. BOARD (MCC-890)

1

1 2

CN06

3

1

CN05

3

SG01

1

F01

3

250VAC T6. 3A

5

CN01

7

9

1

CN11

313

11

33

CR11

CN02

CR12

CR13

TNR R74

CN03

1 1

RY07

RY05

3

TNR R73

RY06

CN07

CN08

DISCHARGE PIPE SENSOR (TD)

BLU

1

1 2 3

3

BLU

BLK

1

1 2 3

3

BLK

HEAT EXCHANGER SENSOR (TE)

– 9 –

4. SPECIFICATION OF ELECTRICAL PARTS

4-1. Indoor Unit (RAS-24SKP-ES2)

FILE NO. SVM-10049

No.

1 Fan motor (for indoor) MF-340-30-1RT DC 340V, 30W 2 Thermo sensor (TA-sensor) ——— 10 kΩ at 25°C 3 Switching Transformer (T01) SWT-77 DC7V, 12 V 4 Microcontroller TMP87CM40ANG-6P68 5 Heat exchanger sensor

(TC-sensor)

6 Line filter (L01) LC*SS11V-R06270 27mH, 600mA 7 Diode (DB01) D3SBA60 4 A, 600 V 8 Capacitor (C03) EKMH451VSN121MQ35S 120 µF, 450 V 9 Fuse (F01) BET6.3A 6.3 A, 250 V

10 Varistor (R09, R10) SR561K14DO 560 V

11 Resistor (R01) RF-5TK1R8

2 TLou

13

v

Relay : (RY03)

P5War1ts name

er motor MP24Z3T Output (Rated) 2 W, 16 poles, 4 phase,

ype

——— 10 kΩ at 25°C

1.8Ω ,

DC 12 V

G5NB-1A-CA

Coil DC 12V, 16.7mA, Contact AC 250V, 3A

Specifications

4-2. Outdoor Unit (RAS-24SA-ES2)

No. Parts name Type Specifications

Output (Rated) 2000W, 2poles, 1 phase, 220-240V 50Hz

1 Compressor PA271X3CS-4MU2 Winding resistance (Ω  ) Red-Black White-Black

(at 20°C) 1.27 2.10 Output (Rated) 42W, 4poles, 1 phase, 220 − 240V, 50Hz

2 Fan motor (for outdoor) WLF-240-85A Winding resistance (Ω) Red-Black White-Black

(at 20° C) 70.5 120.1

Running capacitor

3

(for fan motor) Running capacitor

4

(for compressor)

5

Magnetic contactor

DS451355NPQB AC 450V, 3.0µ F

32332I5606J063 A

B

A35P 220-240V, 50Hz

C 450V, 60µ F

– 10 –

FILE NO. SVM-10049

4-3. Indoor Unit (RAS-24SKHP-ES2)

No. Parts name Type Specifications

1 Fan motor (for indoor) MF-340-30-1RT DC 340V, 30W 2 Thermo sensor (TA-sensor) ——— 10 kΩ at 25°C 3 Switching Transformer (T01) SWT-77 DC 7V, 12V 4 Microcontroller TMP87CM40ANG-6P68 5 Heat exchanger sensor

(TC-sensor)

6 Line filter (L01) LC*SS11V-R06270 27mH, 600mA 7 Diode (DB01) D3SBA60 4 A, 600 V 8 Capacitor (C03) EKMH451VSN121MQ35S 120 µF, 450 V 9 Fuse (F01) BET6.3A 6.3 A, 250 V

10 Varistor (R09, R10) SR561K14DO 560 V

11 Resistor (R01) RF-5TK1R8 1.8Ω , 5W 12 Louver motor MP24Z3T Output (Rated) 2 W, 16 poles, 4 phase,

——— 10 kΩ at 25°C

DC 12 V

4-4. Outdoor Unit (RAS-24S2AH-ES2)

No. Parts name Type Specifications

Output (Rated) 2000W, 2poles, 1 phase, 220 − 240V, 50Hz

1 Compressor PA271X3CS-4MU2 Winding resistance (Ω) Red-Black White-Black

(at 20°C) 1.27 2.10 Output (Rated) 42W, 4poles, 1 phase, 220 – 240V, 50Hz

2 Fan motor (for outdoor) FG-240-42A-1 Winding resistance (Ω) Red-Black White-Black

(at 20°C) 70.5 120.1

Running capacitor

3

(for fan motor) Running capacitor

4

(for compressor) Solenoid coil

5

(for 4-way valve) 6 Thermo sensor TE / TD 10kΩ at 25°C / 50kΩ at 25°C 7 Magnetic contactor A35P 220 ~ 240V, 50Hz 8 Transformer TT-05 220 ~ 240V 9 Microcontroller TMP47C840N

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

DS451305NPQB AC 450V, 3.0µF

B32332I5606J063 AC 450V, 60µF

VHV (STF) AC 220 ~ 240V

– 11 –

5. REFRIGERATION CYCLE DIAGRAM

5-1. RAS-24SKP-ES2 / RAS-24SA-ES2

FILE NO. SVM-10049

Indoor unit

Cooling

0.39 m (Connecting pipe)

∅

12.7

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

Cooling

Compressor

P

Packed valve

(∅12.7 )

Gas container connection (Reinstall etc.)

PA271X3CS-4MUL

Heat exchanger

Cross flow fan

T

0.49 m (Connecting pipe)

∅

6 .35

Packed valve

(∅6.35)

Capillary tube

450 s

∅2.0x

Heat exchanger

Refrigerant R410A 1.90 kg

Cooling

Propeller fan Outdoor unit

Mark ( ) means check points of Gas Leak

Ambient temp.

50 Hz

Standard

pressure

(MPaG)

P

Surface temp. of heat

exchanger interchanging

pipe

T

(°C)

Fan speed

(indoor)

conditions DB/WB

(°C)

Indoor Outdoor

Standard 0.86 9.4 High 27/19 35/24

Cooling High temperature 1.03 14.3 High 32/23 43/26

Low temperature 0.65 1.9 Low 21/15 21/15

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

– 12 –

5-2. RAS-24SKHP-ES2 / RAS-24S2AH-ES2

FILE NO. SVM-10049

Indoor unit

Cooling

0.39 m (Connecting pipe)

Æ12.7

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

Cooling

Heating

P

Packed valve

(Æ12.7)

Heating

4-way valve

Cooling

Discharge Muffler

∅

25x160L

Compressor

Accumulator

PA271X3CS-4MUL

Heat exchanger

Cross flow fan

T1

Capillary tube Æ2.0 x 700

Packed valve

(Æ6.35)

Capillary tube

Æ2.0 x 450

l

0.49 m

(Connecting pipe)

Æ6.35

l

Heat exchanger

Refrigerant R410A 2.00 kg.

Cooling

Heating

Propeller fan Outdoor unit

Mark ( ) means check points of Gas Leak.

Ambient temp.

50Hz

Standard

pressure

(MPaG)

P

Surface temp. of heat

exchanger interchanging

pipe

T1

(°C)

Fan speed

(indoor)

conditions DB/WB

(°C)

Indoor Outdoor

Standard 2.64 44.7 High 20/15 7/6

Heating Overload*1 3.54 ~ 3.80 49.3 ~ 51.0 Low 27/- 24/18

Low temperature 2.28 30.3 High 20/

-

-10/-10

Standard 0.90 11.6 High 27/19 35/24

Cooling Overload 1.10 17.5 High 32/23 43/26

Low temperature 0.73 2.6 Low 21/15 21/15

Note

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

·

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

- 13 -

6. CONTROL BLOCK DIAGRAM

6.1 RAS-24SKP-ES2 / RAS-24SA-ES2

Indoor Unit Control Panel

Heat Exchanger Sensor

Functions

• Louver Control

FILE NO. SVM-10049

M.C.U.

Operation

Display

Temperature Sensor

Infrared Rays Signal Receiver

Initiallizing Circuit

Infrared

Rays

Remote

Control

From Outdoor Unit

240 V AC 50 Hz

Clock Frequency

Oscillator Circuit

Power Supply

Circuit

Noise Filter

• 3-minute Delay at Restart for Compressor

• Motor Revolution Control

• Processing

(Temperature Processing)

• Timer

Outdoor unit

ON/OFF Signal

Relay Driver

Relay RY03

Outdoor Unit

Louver ON/OFF Signal

Louver Driver

Timer

Display

Filter Sign

Display

Fan Only

Sign Display

Hi Power

Sign Display

Indoor

Fan Motor

Louver Motor

REMOTE CONTROL

Infrared Rays

Remote Control

Operation ( )Operation ( )

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

COMFORT SLEEP

QUIET

– 14 –

6.2 RAS-24SKHP-ES2 / RAS-24S2AH-ES2

Indoor Unit Control Panel

Heat Exchanger Sensor

Functions

• Louver Control

FILE NO. SVM-10049

M.C.U.

Operation

Display

Temperature Sensor

Infrared Rays Signal Receiver

Initiallizing Circuit

Infrared

Rays

Remote

Control

From Outdoor Unit

240 V AC 50 Hz

Clock Frequency Oscillator Circuit

Power Supply

Circuit

Noise Filter

• 3-minute Delay at Restart for Compressor

• Motor Revolution Control

• Processing

(Temperature Processing)

• Timer

• Serial Signal Communication

Louver ON/OFF Signal

Louver Driver

Serial Signal Transmitter/Receiver

Serial Signal Communication

Timer

Display

Filter Sign

Display

PRE DEF.

Sign Display

Hi Power

Sign Display

Indoor

Fan Motor

Louver Motor

REMOTE CONTROL

Infrared Rays

Remote Control

Operation ( )Operation ( )

Operation Mode Selection

AUTO, COOL, DRY, HEAT, FAN ONLY

Temperature Setting

Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

Louver Auto Swing

Louver Direction Setting

ECO

Hi power

TIMER 1.3.5.9H

COMFORT SLEEP

QUIET

– 15 –

7. OPERATION DESCRIPTION

7-1. Remote control

7-1-1. Function of Push Putton

1

11

Infrared signal emitter

11

2

Start/Stop button

3

Mode select button (MODE)

4

Temperature button (TEMP)

5

Fan speed button (FAN)

6

Swing louver button (SWING)

7

Set louver button (FIX)

8

On timer button (ON) Off timer button (OFF)

9

18

10

Sleep timer button (SLEEP)

19

Timer setup button (SET)

11 12

20

Timer clear button (CLR)

Memory and Preset button (PRESET)

13 14

One Touch button (ONE-TOUCH)

15

High power button (Hi-POWER)

16

Economy button (ECO)

17

Quiet button (QUIET)

18

Comfort sleep button (COMFORT SLEEP)

19

Filter reset button (FILTER)

20

Clock Reset button (CLOCK)

21

Check button (CHK)

FILE NO. SVM-10049

1

13

14

2

17

6

7

8 10 21

19

PRESET

ONE-TOUCH

QUIET

SWING

TIMER

SLEEP

CHK

FAN

TEMP

MODE

COMFORT

SLEEP

FIX Hi-POWER ECO

ON

OFF

FILTER

CLOCK

5

4 3

18

15 16

CLR

SET

12

9

11

20

− 16 −

FILE NO. SVM-10049

7-1-2. Display of Remote Control

All indications, except for the clock time indicator, are displayed by pressing the button.

1. Transmission mark

This transmission mark remote controller transmits signals to the indoor unit.

indicates when the

2. Mode indicator

Indicates the current operation mode. (A : Auto, : Cool,

: Dry, : Heat, : Fan only)

3. Temperature indicator

Indicates the temperature setting. (17°C to 30°C)

4. FAN speed indicator

Indicates the selected fan speed. AUTO or five fan speed levels

LOW , LOW+ , MED , MED+ ,

( HIGH ) can be shown. Indicate Auto will be appear with Dry operation

( : Dry) only.

9

1

12

2

13

10

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.

The button for more than 3 seconds while the mark is

blinks. Press another button to turn off the mark.

mark is shown when holding down the

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.)

10. Comfort sleep

Indicates when comfort sleep is activaled. Press comfort sleep button to selectter

11

6

3

8

7

4

5

11. Quiet

Indicates when quiet is activated. Press quiet button to start and press it again to stop operation.

12. One-Touch

Indicates when one touch comfort is activated. Press one-touch button to start the operation.

13. Swing

Indicates when louver is swing. Press swing button to start the swing operation and press it again to stop the swing operation.

− 17 −

7-2. Outline of Air Conditioner Control

y

A

y

P

A

This is a fixed capacity type air conditioner, which uses a DC motor for an indoor fan. The DC motor drive circuit is mounted in the indoor unit. And electrical parts which operate the compressor and the outdoor fan motor, are mounted in the outdoor unit. The air conditioner is mainly controlled by the indoor unit controller. The controller operates the indoor fan motor based upon commands transmitted by the remote control and transfers the operation commands to the outdoor unit. 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

Operations according to the commands

from the indoor unit

FILE NO. SVM-10049

• Turning off the compressor and outdoor fan

when the outdoor unit receives the shutdown command

• Defrost control in heating operation

(Temperature measurement by the Indoor heat exchanger, control the four-way valve and

outdoor fan motor control)

7-2-1.

(1)

(2) Swing

7-2-2. Indoor Fan Control

Table (7-2-1) Cooling

Louver contr

V

er

tical air flow louver

ol

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.

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.

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 7-2-3)

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 shown in Table 7-2-1 and Table 7-2-2

Table (7-2-2) Heating

Indication

L L+

M M+

H

Fan speed

Low

(L + M) / 2

Med

(M + H) / 2

High

Indication L L+

M M+

H

Fan speed

Low

(L + M) / 2

Med

(M + H) / 2

High

2) When setting the fan speed to AUTO on the remote controller, revolution of the fan motor is controlled to the fan speed level show in Table 7-2-3 according to the setup temperature, room temperature,

Table 7-2-3 Indoor fan and air flow rate

OPERATION

MODE

RAS-24SKP-ES2

Model

OPERATION

MODE

RAS-24SKHP-ES2

Model

Cooling Fan only Dr

rpm

ir flow volume (m3/h)

Cooling Fan only Dr Heat

rpm

ir flow volume (m3/h)

UH

1340

1240

UH H M+ M L+ L L- UL SL

1340

1240

and heat exchanger temperature.

FAN TA

H M+ M L+ L L- UL SL H M+ M L+ L L-

M+ M L+ L L- UL SL

1220 1100 1025 950 850 700 600

1120 1000 930 850 750 600 500

FAN TA

H M+ M L+ L L-

M+ M L+ L L- UL SL

1220 1100 1100 950 950 950 850 700 600

1120 1000 1000 850 850 850 750 600 500

- 18 -

FILE NO. SVM-10049

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 thereafter 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.

°C

7-3-2. Cooling operation

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

(1) The compressor, 4-way valve, (Heat pump model

only) outdoor fan and operation display lamp are controlled as shown in Fig. 7-3-2.

° C



ON ON

OFF OFF OFF ON

4-way valve

Compressor

Outdoor fan

OPERATION

(Room temp.) (Preset temp.)

Preset temp.

0.5

0

Fig. 7-3-2

display lamp

+3

+2.5

+2

+1.5

+1

+0.5

(Room temp.) − (Preset temp.)

Preset temp.

0

(Preset temp.: 24 °C)

NOTE 1 : *1 : Fan speed = (M + − L) x 3/4 + L

*2 : Fan speed = (M + − L) x 2/4 + L *3 : Fan speed = (M + − L) x 1/4 + L

2 : The Hi Power, ECO and COMFORT SLEEP

operation can not be set

(Linear approximation from M+ and L)

Fig. 7-3-1 Setting of air flow [FAN:AUTO]

M+

*1

*2

*3

(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.

°C

(Room temp.) − (Preset temp.)

Preset temp.

+3

+2.5

+2

+1.5

+1

+0.5

0

-0.5

M+

*1

*2

*3

NOTE1 : *1 : Fan speed = (M + − L) x 3/4 + L

*2 : Fan speed = (M + − L) x 2/4 + L *3 : Fan speed = (M + − L) x 1/4 + L

(Linear approximation from M+ and L)

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

- 19 -

FILE NO. SVM-10049

7-3-3. Dry operation

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

(1) The compressor, 4-way valve, (Heat pump model

only) outdoor fan and operation display lamp are controlled as shown in Fig. 7-3-4.

° C

ON:6min.

OFF:4min.

ON

ON:5min.

OFF:5min.

OFF

4-way valve

Outdoor fan

OPERATION

display lamp

(Room temp.) (Preset temp.)

Preset temp.

+3

+2

+1

ON:6min.

OFF:4min.

OFF

ON:5min.

OFF:5min.

OFF

0

Compressor

Fig. 7-3-4

7-3-4. Heating operation *Heat pump model only

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

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

operation display lamp are controlled as shown in Fig. 7-3-6.

° C

Preset temp.

0

0.5

(Room temp.) (Preset temp.)

ON

OFF

ON

Compressor

ON

OFF

ON

4-way valve

Outdoor fan

OPERATION

Fig. 7-3-6

display lamp

(2) The microprocessor turns the compressor on and

off at the regular intervals (4 to 6 minutes). While the compressor is turning off, the indoor fan motor operates in the SUPER LOW position. The pattern of operation depending on the relation between room temperature and preset temperatures is shown in Fig. 7-3-5.

Room temp.

Preset temp.+1

Preset temp.

Compressor

Outdoor fan

Indoor fan

ON ON ON ON

OFF OFF OFF

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

*Super Low

Fig. 7-3-5

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

only.

(4) The ECO, COMFORT SLEEP, QUIET and

Hi POWER operations can not be set.

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

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

Preset temp.

°C

0

-0.5

-1

-1.5

-2

-5.0

-5.5

[FAN AUTO]

(Room temp.) − (Preset temp.)

L

*1 *2

+

M

H

*1 : Fan speed = (M + − L) x 1/4 + L

*2 : Fan speed = (M + − L) x 2/4 + L *3 : Fan speed = (M + − L) x 3/4 + L

(Calculated with Linear approximation from M+ and L+)

Fig. 7-3-7

- 20 -

FILE NO. SVM-10049

y.

c

e

(3) The indoor heat exchanger restricts revolving

speed of the fan motor to prevent a cold draft. The upper limit of the revolving speed is shown in Fig. 7-3-8

Fan speed AUTO Fan speed MANUAL

46Tc34 45 33

33 21 32 20

*A+0 *A+0

*A-8 *A-8

Fan speed MANUAL or AUTO in starting Fan speed AUTO in stability

* No limitation while fan speed MANUAL mode is in stabilit * A: When Tsc 24, A is 24, and when Tsc < 24, A is Ts

Tsc: Set valu

Normal AUTO

Line-approximate H and SL with Tc.

SL (W2)

Stop

L-H (Up to setting speed)

Line-approximate H and SL with Tc.

SL (W2)

Stop

[In starting and in stability]

In starting

FAN • Until 12 minutes

AUTO

FAN • Room temp. < Set

Manual

passed after operation start

• When 12 to 25 minutes

passed after operation start and room temp. is 3°C or lower than set temp.

temp.–4°C

In stability

• When 12 to 25 minutes

passed after opeartion start and room temp. is than (set ) between preset

• When 25 minutes or

more passed after operation start

• Room temp. Set

temp. –3.5°C

3°C

7-3-5. Automatic operation

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

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

is selected according to difference between the preset temperature and the room temperature at which the automatic operation has started, as shown in Fig. 7-3-9. The Fan only operation continues until the room temperature reaches a level at which another mode is selected.

(2) Temporary Auto

When the [RESET] button on the indoor unit is pushed, the preset temperature is fixed at 24°C and the indoor unit is controlled as shown in Fig. 7-3-9.

°C

Cooling operation

0

Fan only operation

-1

Heating operation

(Room temp.) − (Preset temp.)

Heat pump model Cooling model

Fig. 7-3-9

Fig. 7-3-8 Cold draft preventing control

(4) In order to prevent cold draft when compressor

during heating operation.Then louver will move to upper position and fan speed will reduce or OFF.

- 21 -

7-4. Drescription of Safety and Reliability Prevention Function

FILE NO. SVM-10049

7-4-1. Low-Temperature Limit Control

The microcontroller detects the indoor heat exchanger temperature to prevent the indoor heat exchanger from freezing. The compressor and outdoor fan motor are controlled as shown in Fig. 7-4-1.

Heat exchanger temperature

(°C)

7

4

Compressor Outdoor fan

ON

Less than 4°C continues

for 5 minutes

OFF

Fig. 7-4-1

7-4-2 High-Temperature Limit Control

*Heat pump model only

The microcontroller detects the indoor heat exchanger temperature to prevent pressure of a refrigerating cycle from increasing excessively. The compressor and outdoor fan motor are controlled as shown in Fig. 7-4-2.

7-4-3. Defrost Operation *Heat pump model only

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

7-4-3-1. Defrost starting condition

A-Zone : If -10°C > Teo ≥

start when. Teo - Te ≥

~ 30 min after operation.

B-Zone : If Te ≤

-18°C, defrost start instantaneously

(Suddenly) 00 ~ 25 min ofter operation

C-Zone : If -2ºC ≥

Teo ≥ -10°C defrost will start when

Teo - Te ≤ -3°C at least 20 sec or ~ 60 min after operation.

- 18°C, defrost will

2.5°C at teat 20 sec or

Compressor

OFF

ON

Outdoor fan

OFF

ON

Fig. 7-4-2

Heat exchanger temp.

(°C) 62

55 54

7-4-3-2. Defrost finish condition.

1) If Te ≥ 3°C at least 60 sec -->4 way value on.

2) If Te ≥ 8°C --> 4 way value on.

Timing

Operation time (4 Loops = Tt)

Td1

Td2

Td3 Td4

Finish time recordStart time record

Defrost time rate : (Td/Tt) x 100 Heating time rate : (Tt - Td) x Tt

Fig. 7-4-3

- 22 -

FILE NO. SVM-10049

7-5. One-Touch Operation

(Heatpump Model : RAS-24SKHP-ES2)

One touch comfort is the fully automated operation that is set according to the preferable condition in a region.

Fan Operation

AUTO

*AUTO/L

L

0

*AUTO/L : Fan operates depends on the setting temperature and room temperature.

During the One Touch Comfort mode if the indoor unit receives any signal with other operation mode, the unit will cancel the comfort mode and operates according to the signal received.

Operation description

When an indoor unit receives "One Touch Comfort Signal" from the remote controller, the indoor unit operates as following.

1) Air conditioner starts to operation when the signal is received, even if the air conditioner was OFF.

2) Operation mode is set according to room temperature, the same as AUTO mode.

3) Target temperature is 24ºC.

4) Louver position is set as stored position.

(Cooling Only Model : RAS-24SKP-ES2)

One touch comfort is the fully automated operation that is set according to the preferable condition in a region.

Fan Operation

Hi-POWER

12

Fig. 7-5-1

25

*AUTO/L

Time after operation starts (min)

0

*AUTO/L : Fan operates depends on the setting temperature and room temperature.

During the One Touch Comfort mode if the indoor unit receives any signal with other operation mode, the unit will cancel the comfort mode and operates according to the signal received.

Operation description.

When an indoor unit receives "One Touch Comfort Signal" from the remote controller, the indoor unit operates as following.

1) Air conditioner starts to operation when the signal is received, even if the air conditioner was OFF.

2) Operation mode is set Cooling mode.

3) Target temperature is 22ºC.

4) Louver position is set swing.

5) Fan is controlled as diagram.

12

Fig. 7-5-2

25

- 23 -

Time after operation starts (min)