Toshiba RAS-07SKHP-E, RAS-07S2AH-E, RAS-10SKHP-E, RAS-10S2AH-E Service manual

SERVICE MANUAL

AIR CONDITIONER

SPLIT WALL TYPE

RAS-07SKHP-E / RAS-07S2AH-E RAS-10SKHP-E / RAS-10S2AH-E

FILE NO. SVM-07023-1

Revised May, 2007

CONTENTS

1. SPECIFICATIONS

2. CONSTRUCTION VIEWS

2-1 Indoor Unit

2-2 Outdoor Unit (RAS-10S2AH-E)

2-3 Outdoor Unit (RAS-07S2AH-E)

3. WIRING DIAGRAM

4. SPECIFICATION OF ELECTRICAL PARTS

4-1 Indoor Unit (RAS-10SKHP-E, RAS-07SKHP-E) 4-2 Outdoor Unit (RAS-10S2AH-E) 4-3 Outdoor Unit (RAS-07S2AH-E)

5. REFRIGERATION CYCLE DIAGRAM

5-1 RAS-10SKHP-E / RAS-10S2AH-E 5-2 RAS-07SKHP-E / RAS-07S2AH-E

FILE NO. SVM-07023

6. CONTROL BLOCK DIAGRAM

7. OPERATION DESCRIPTION

7-1 Remote control 7-2 Outline of Air Conditioner Control 7-3 Description of Operation Mode 7-4 High-Temperature Limit Control 7-5 Low-Temperature Limit Control 7-6 Defrost Operation 7-7 Current Limit Control 7-8 One-Touch Comfort 7-9 Hi POWER Mode 7-10 QUIET Mode 7-11 ECO Operation

7-12 COMFORT SLEEP mode 7-13 Auto Restart Function 7-14 Self-Cleaning Function

- 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 How to Set Remote Control Selector Switch 8-7 Others

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 Troubleshooting Flowcharts

9-6 Troubleshooting for Remote Control

FILE NO. SVM-07023

10. PART REPLACEMENT

10-1 Indoor Unit 10-2 Outdoor Unit

11. EXPLODED VIEWS AND PARTS LIST

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

11-3 Outdoor Unit (RAS-10S2AH-E) 11-4 Outdoor Unit (RAS-07S2AH-E)

- 2 -

1. SPECIFICATIONS

FILE NO. SVM-07023

MODEL

RAS-10SKHP-E / RAS-10S2AH-E

RAS-07SKHP-E / RAS-07S2AH-E

ITEM Cooling Heating Cooling Heating

Capacity

Phase 1∅

Power source V 220 − 240

Power consumption kW 0.77 0.81 0.74 0.76 0.61 0.68 0.54 0.59 Power factor % 97 94 94 91 98 96 98 96

Running Indoor A 0.15 current Outdoor A 3.45 3.43 3.30 3.23 2.69 2.77 2.35 2.40 Starting current A 19 15 Moisture removal lit/h 1.2 Noise Indoor (H/M/L) dB 40/36/32 38/33/28

Outdoor (220-240V) dB

Refrigerant

Refrigerant control Capillary tube

Interconnection

pipe

Name of refrigerant R-22 Rated amount kg 0.75 0.64

Gas side size mm 9.52

Connection type Flare connection

Liquid side size mm 6.35

Connection type Flare connection

Maximum length (One way)

Maximum height difference

220V 240V 220V 240V 220V 240V 220V 240V

kW 2.50 2.55 2.70 2.72 2.30 2.50 2.30 2.50

Hz 50

m 10*

m 5

49 48

∅

46 47

INDOOR UNIT RAS-10SKHP-E RAS-07SKHP-E

Height mm 250

Dimensions Width mm 740

Depth mm 195

Net weight kg 8

Evaporator type Finned tube

Indoor fan type Cross flow fan

High fan m3/h 540 560 540

Airflow volume Medium fan m3/h 460 500 470

Low fan m3/h 390 400 370

Fan motor output W 20

Air filter Honeycomb woven filter with PP frame

540 440 350

OUTDOOR UNIT RAS-10S2AH-E RAS-07S2AH-E

Height mm 550 530

Dimensions Width mm 780 660

Depth mm 290 240

Net weight kg 32 25

Condenser type Finned tube

Outdoor fan type Propeller fan

Airflow volume m3/h 1740 1850 1740 1850 1640 1720 1640 1720

Fan motor output W 20

Compressor

Safety device Fuse, Overload relay

Louver type Automatic louver Usable outdoor temperature range °C 15 ~ 43 −10 ~ 24 21 ~ 43

Model PH150X1C-4DZDN3 Output W 750

PH108X1C-4DZDN2

605

15 ~ 43

– 3 –

Note : 1

Capacity is based on the following temperature conditions.

FILE NO. SVM-07023

Temperature

Indoor unit inlet air temperature

Outdoor unit inlet air temperature

Condition

Cooling Heating

(DB) 27°C20°C

(WB) 19°C15°C

(DB) 35°C7°C

(WB) 24°C6°C

JIS C9612

- 4 -

2-1. Indoor Unit

FILE NO. SVM-07023

2. CONSTRUCTION VIEWS

Front panel

Knock out system

Air inlet

250

55 60

105 135

Air filter

740

Air outlet

500

Heat exchanger

60 55

Knock out system

195

Drain hose (0.5m)

250

Hanger

13590

235

215

Hanger

145

290

605

– 5 –

235

215

Hanger

145

135 90

Installation plate outline

Center line

Connecting pipe (0.37m)

6.35)(Flare

Connecting pipe (0.37m

(Flare 9.52)

For stud bold ( 6)

40 165 45

)

10)For stud bold (

Wireless remote control

157

2.2. Outdoor Unit (RAS-10S2AH-E)

600

320

306

A detail Drawing (Back leg)

R5.5

6 hole

320

25 Drain outlet

FAN-GUARD

436

108 125

11 x 14

(For 8 -

Hole

10 anchor bolt)

FILE NO. SVM-07023

306

320

6 hole

11x14 hole

B Detail Drawing (Front leg)

36 50

COVER-PV

290

550

45 or more

275

321 342

Electrical part cover

Liquid side (Flare 6.35)

Gas side (Flare 9.52)

ervice port

-Ø 10 anchor bolt)

Z View

600

Air intlel

9060090

129

-R5- 5x17L UShape (For 8

320

100 or more

Air outlel

400 or more

Installation dimension

− 6 −

600 or more

2- 11x14 Long holes(For 8 - 10 anchor bolt)

2-3. Outdoor Unit (RAS-07S2AH-E)

FILE NO. SVM-07023

- 7 -

3. WIRING DIAGRAM

RAS-10SKHP-E / RAS-10S2AH-E RAS-07SKHP-E / RAS-07S2AH-E

FILE NO. SVM-07023

BRW

BLU

GRN & YEL

SINGLE PHASE 220-240V 50/60Hz

BLK

WHI

BLK

P04

CN31

T02

C.T.

1 1

3 3

CN27

CN03

1 1

BLK

THERMO

BLK

SENSOR (TA)

SG01

DSA

BLK

PINK

1 1

R22

VARISTOR

RY03

73 C x2

THERMAL FUSE

PINK

CN04

T6.3A 250VAC

RY01

CN01

HEAT EXCHANGER

BLK

SENSOR (TC)

RY04

CR02

CR01

LOUVER MOTOR

YEL

5 5

STO

C01

VARI

MAIN P.C. BOARD WP-015

INFRARED RAYS RECEIVE

AND INDICATION PARTS

CN25

BLU

WHI

YEL

CN07

DC5V

Voltage Regulator

C02

L01

145 C

1 1 2 2 3 3 4 4 5 5

AC FAN MOTOR

BLU

IC35

CN10

321 321

BLU

321 321

C15

BLK

GRY

YEL

BRW

RED

WHI

54 8 54 8

BLU

54 8 54 8

R319

5 5

WHI

BLU

CN14

Micro Power Module

DC12V

C63

DB01

3 3

CN11

21 3

INDOOR TERMINAL BLOCK

OUTDOOR TERMINAL BLOCK

OVER LOAD RELAY

COMPRESSOR

BLK

PNK

WHI

BLK

(L)2(N)

RED

WHI

BLK

SOLENOID COIL

RED

CAPACITOR

RED

BLK

CAPACITOR

FAN MOTOR

BLU

WHI BLK

− 8 −

INDOOR

OUTDOOR

CHASSIS

FILE NO. SVM-07023

4. SPECIFICATION OF ELECTRICAL PARTS

4-1. Indoor Unit (RAS-10SKHP-E, RAS-07SKHP-E)

No. Parts name Type Specifications

1 Fan motor (for indoor) AFS-220-20-4AR AC Motor with 145 °C thermo fuse 2 Thermo sensor (TA-sensor) 10k at 25 C 3 Micro power module (M01) RM1260V 4 Microcontroller unit (IC30) TMP87CM40AFG-6P69 5 Heat exchanger sensor

(TC-sensor) 6 Line filter (L01) LC*SS11V-06270 27mH, 600mA 7 Bridge rectifier (DB01) DB105G 1A, 600 V

8 Capacitor (C63) EKMH401VSN470MP20S 47mF, 400 V

9 Fuse (F01) BET6.3A 6.3A, 250VAC

10 Varistor (R21, R22) TND15G-561KB0SLAA0 560 V 11 Resistor (R319) RF-2TK5R6 5.6 , 2 W 12 Louver motor 24BYJ48 12VDC 13 Relay (Comp., RY01) G4A-1A-E-CA Rating 20A/AC250 V, 12VDC 14 Relay (Fan, RY03) G5NB-1A Rating 3A/AC250 V, 12VDC 15 Relay (Solenoide, RY04) G5NB-1A Rating 3A/AC250 V, 12VDC

10k at 25 C

4-2. Outdoor Unit (RAS-10S2AH-E)

No.

1 Compressor PH180X1C-4DZDN3 Winding resistance ( ) C-R C-S

2 Fan motor (for outdoor) Winding resistance ( ) Red-Black White-Black

5 Overload relay JMRA99269-9103 U/T : 7.3A (80°

Parts name Type Specifications

Output (Rated) 1000 W, 2 poles, 1 phase, 220 - 240 V, 50Hz

(at 20 C) 3.33 3.78 Output (Rated) 20 W, 6 poles, 1 phase, 220 - 240 V, 50Hz

C), OPEN :

Running capacitor (for fan motor)

Running capacitor (for compressor)

SKF-240-20B

(at 20°C

DS451155NPQB AC 450 V ~, 1.5mF

RS44B256U0214S AC 440 V ~, 30mF

235.2 260.1

135±5°C, CLOSE : 69±11°C

- 9 -

FILE NO. SVM-07023

4-3. Outdoor Unit (RAS-07S2AH-E)

No. Parts name Type Specifications

Output (Rated) 605W, 2poles, 1 phase, 220 − 240V, 50Hz

1 Compressor PH108X1C-4DZDN2 Winding resistance (Ω) C-R C-S

(at 20°C) 4.84 4.40

Output (Rated) 20W, 6poles, 1 phase, 220 − 240V, 50Hz

2 Fan motor (for outdoor)

Running capacitor

(for fan motor)

Running capacitor

(for compressor)

5 Overload relay

DS451155NPQB AC 450V~, 1.5 F

JMRA99208-9102

SKF-240-20B

RS44B256U0213S AC 440V~, 25 F

Winding resistance (Ω) Red-Black White-Black

(at 20°C)

U/T: 4.2A (80°C), OPEN: 135±5°C, CLOSE: 69±11°C

235.2

260.1

- 10 -

5. REFRIGERATION CYCLE DIAGRAM

5-1. RAS-10SKHP-E / RAS-10S2AH-E

FILE NO. SVM-07023

Indoor unit

Cooling

0.39 m (Connecting pipe)

Æ9.52

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

Cooling

Heating

Packed valve

(Æ9.52)

Heating

4-way valve

Cooling

Compressor

PH150X1C-4DZDN3

Accumulator

Heat exchanger

Cross flow fan

Capillary tube

Æ1.2 x 500l

0.49 m (Connecting pipe) Æ6.35

Packed valve

(Æ6.35)

Capillary tube

Æ0.8 x 700l

Heat exchanger

Refrigerant R22 : 0.75 kg.

Cooling Heating

Propeller fan Outdoor unit

Mark ( ) means check points of Gas Leak.

Ambient temp.

50Hz

Standar d

pressure

(MPaG)

Surface temp. of heat

exchanger inter changing

pipe

(°C)

Fan speed

(indoor)

conditions DB/WB

(°C)

Indoor Outdoor

Standard 1.59 41.0 High 20/15 7/6

Heating Overload*1 2.14 ~ 2.36 50.0 ~ 58.0 Low 27/- 24/18

Low temperature 1.30 32.0 High 20/-

-10/-10

Standard 0.52 12.0 High 27/19 35/24

Cooling Overload 0.62 16.0 High 32/23 43/26

Low temperature 0.44 5.0 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.

- 11 -

5-2. RAS-07SKHP-E / RAS-07S2AH-E

FILE NO. SVM-07023

Indoor unit

Cooling

0.39m (Connecting pipe) ∅9.52

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

Cooling

Heating

Packed valve

(∅9.52)

Heating

4-way valve

Cooling

Compressor

PH108X1C-4DZDN2

Accumulator

Heat exchanger

Cross flow fan

0.49m (Connecting pipe) ∅6.35

Packed valve

(∅6.35)

Capillary tube

∅1.0x1000S

(2 pcs.)

Heat exchanger

Refrigerant R-22 : 0.64 kg.

Fan speed

(indoor)

Ambient temp.

conditions DB/WB

(°C)

Indoor Outdoor

Cooling Heating

50Hz

Propeller fan Outdoor unit

Standard

pressure P

(MPaG)

Mark( )means check points of Gas Leak.

Surface temp. of heat

exchanger interchanging

pipe T1 (°C)

Standard 1.32 35.0 High 20/– 7/6

Heating Overload 1.93 50.0 Low 27/– 24/18

Low temperature 1.14 30.0 High 20/––10/–10 Standard 0.52 13.0 High 27/19 35/24

Cooling Overload 0.68 18.0 High 32/23 43/26

Low temperature 0.32 7.0 Low 21/15 21/15

Note :

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

– 12 –

6. CONTROL BLOCK DIAGRAM

RAS-10SKHP-E / RAS-10S2AH-E, RAS-07SKHP-E / RAS-07S2AH-E

FILE NO. SVM-07023

Heat Exchange sensor

Thermo. Sensor

Current Sensor

(Compressor Current)

Infrared Rays Signal Reciver

Main Unit Control Panel

Functions

• Louver Control

•3-minutes Delay at Restart

for Compressor

Initiallizing Circuit

Clock Frequency Oscillator Circuit

Power Supply

Circuit

Noise Filter Relay Driver, Louver Driver

•Motor Revolution Control

•Processing

(Temperature Processing)

•Timer

Compressor

ON/OFF

Signal

Outdoor Fan

M.C.U.

ON/OFF

Signal

4-Way Valve

ON/OFF

Signal

Operation

Display

Timer

Display

Indoor Fan

Motor

Louver

ON/OFF

Signal

Louver

Motor

220-240 V~, 50Hz

REMOTE CONTROL

Relay

RY01

Compressor 4-Way Valve

Remote Control

Operation (START/STOP)

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

Relay

Outdoor Fan Motor

RY03

Infrared Rays

Relay

RY04

Hi power

Filter Reset

− 13 −

7. OPERATION DESCRIPTION

FILE NO. SVM-07023

7-1. Remote control

7-1-1. Function of Push Putton

11 Infrared signal emitter

Start/Stop button

Mode select button (MODE)

Temperature button (TEMP)

Fan speed button (FAN)

Swing louver button (SWING)

Set louver button (FIX)

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

Sleep timer button (SLEEP)

Timer setup button (SET)

11 12

Timer clear button (CLR)

Memory and Preset button (PRESET)

One Touch button (ONE-TOUCH)

High power button (Hi-POWER)

Economy button (ECO)

Quiet button (QUIET)

Comfort sleep button (COMFORT SLEEP)

Filter reset button (FILTER)

Clock Reset button (CLOCK)

20 21

Check button (CHK)

TOSHIBA

PRESET

ONE-TOUCH

QUIET

SWING

FIX Hi-POWER ECO

TIMER

SLEEP

CHK

FILTER

TEMP

OFF

COMFORT

CLOCK

FAN

MODE

SLEEP

CLR

SET

− 14 −

FILE NO. SVM-07023

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. (AUTO : Automatic control, A : Auto changeover control,

: 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. Indicates AUTO when the operating mode is

either AUTO or

: Dry.

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 oper ation.

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

flashing. 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 bu

11. Quiet

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

tton to selectter

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.

− 15 −

FILE NO. SVM-07023

7-2. Outline of Air Conditioner Control

This is a fixed capacity type air conditioner, which uses a AC motor for an indoor fan. The AC 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 controller. 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

• 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 and control for the four-way valve and the outdoor fan motor) *Heat pump Model only

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 [FIX] 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 model, and in 5 stages in AUTO mode, respectively. (Table 7-2-1)

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 Fig. 7-2-1 and

Fig 7-2-2

Fig (7-2-1) Cooling Fig (7-2-2) Heating

Indication

L L+

M M+

Fan speed

(L + M) / 2

(M + H) / 2

Indication

L L+

M M+

Fan speed

(L + M) / 2

(M + H) / 2

Table 7-2-1 Indoor fan and air flow rate

Fan speed level

OPERATION

MODE

RAS-07SKHP-E

Model

RAS-10SKHP-E

Cool Heat Dry fan speed (rpm) Air flow (m fan speed (rpm) Air flow (m3/h)

/h)

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 1 according to the setup temperature, room temperature, and heat exchanger temperature.

WF WE WD WC WB WA W9 W8 W7 W6 W5 W4 W3 W2 W1

UH H M+ M L+ L L- UL SUL

UH H M+ M+ L+ L L- UL SUL

UH H M+ M L+ L L- UL SUL

1300 1300 1300 1300 1250 1150 1100 950 950 900 800 750 700 650 500

540 540 540 540 510 470 440 370

1350 1350 1350 1300 1250 1180 1140 1000 980 980 900 800 750 700 550

560 560 560 540 510 500 460 400

370 350 300 270 250 220 150

390 390 350 300 270 250 180

− 16 −

FILE NO. SVM-07023

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. 7-3-3. 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, outdoor fan and

operation display lamp are controlled as shown in Fig. 7-3-4.

° C



ON ON

OFF OFF OFF ON

4-way valve

Compressor

Outdoor fan

(Room temp.) (Preset temp.)

Preset temp.

0.5

Fig. 7-3-4

display lamp

OPERATION

(Room temp.) − (Preset temp.)

Preset temp.

+3 +2.5 +2

+1.5 +1 +0.5 0

(Preset temp.: 24 °C)

M+

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)

NOTE2 : The Hi Power, ECO and COMFORT SLEEP

operation can not be set

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

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

motor operates as shown in Fig. 7-3-5. When

*1 *2 *3

[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

-0.5

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. 7-3-5 Setting of air flow [FAN:AUTO]

− 17 −

FILE NO. SVM-07023

7-3-3. Dry operation

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

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

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

° C

ON:6min.

OFF:4min.

ON:5min.

OFF:5min.

OFF

4-way valve

Outdoor fan

(Room temp.) (Preset temp.)

Preset temp.

ON:6min.

OFF:4min.

OFF

ON:5min.

OFF:5min.

OFF

Compressor

Fig. 7-3-6

7-3-4. Heating operation

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

Preset temp.

display lamp

OPERATION

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

operation display lamp are controlled as shown in Fig. 7-3-8.

° C

0.5

(Room temp.) (Preset temp.)

OFF

Compressor

OFF

4-way valve

Outdoor fan

OPERATION

display lamp

Fig. 7-3-8

(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. 7-3-7.

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. 7-3-7

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

only.

(4) The ECO 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. 7-3-9. When [FAN] button is set to LOW, LOW+, MED, MED+ or HIGH, the motor operates with a constant air flow.

Preset temp.

°C

-0.5

-1

-1.5

-2

-5.0

-5.5

[FAN AUTO]

(Room temp.) − (Preset temp.)

*1 *2

*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 inear approximation from M+ and L+)

Fig. 7-3-9

− 18 −

)

FILE NO. SVM-07023

(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. 7-3-10 and Table 7-3-2.

T 46 46 45 45 33

33 33 21 32 32 20

*A+4 *A+4 *A+4

*A-4 *A-4 *A-4

* 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

Fan speed MAN Fan speed AUTO in stabilit Fan speed AUTO in startin

H (WE

Line-approximate H and S

SUL (W2

L with Tc

Stop

AL in startin

Fig. 7-3-10 Cold draft preventing control

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. 7-3-11. 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. 7-3-11.

°C

Cooling operation

Table 7-3-2

Fan *5 *6 speed Starting period Stabilized period

AUTO • Up until 12 minutes

passed after starting the unit

• From 12 to 25 minutes passed after starting the unit and room temperature is 3°C lower than preset temperature

Manual • Room temperature (L – H) < Preset temperature

• From 12 to 25 minutes passed after starting the unit and room temperature is between preset temperature and 3°C lower than preset temperature

• 25 minutes or more passed after starting the unit

• Room temperature

Preset temperature

–4°C

–3.5°C

Fan only operation

-1

Heating operation

(Room temp.) − (Preset temp.)

Fig. 7-3-11

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FILE NO. SVM-07023

7-4. High-Temperature Limit Control

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. 7-4-1.

Compressor

OFF

Outdoor fan

OFF

Heat exchanger temp.

(°C) 60

53 52

Fig. 7-4-1

7-5. 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. 7-5-1 and 7-5-2.

7-6. 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.

7-6-1. Condition to start the defrost operation

The defrost operation starts whichever below conditions are satisfied.

(1) When the cumulative compressor operating 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. 7-6-1. 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.

RAS-07SKHP-E RAS-10SKHP-E

Heat exchanger temperature

(°C)

Compressor Outdoor fan

Fig. 7-5-1

Less than 2°C continues

for 5 minutes

OFF

xchanger temp

Indoor heat e

- Room temp

Fig. 7-6-1 (Indoor fan speed : M)

7-6-2. Defrost operation time control

(1) The heating operation is performed for at least

40 minutes.

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

The defrost operating time for the 4th cycle is

10 minutes. (When the outdoor temperature is very low, however, the defrost operating time is 10 minutes.)

Cumulative compressor operating time

− 20 −

FILE NO. SVM-07023

minutes

Heating

minutes

Defrost

Heating

Max 6 minutes

minutes

Defrost

1 cycle

Heating

10 minutes

minutes

Defrost

Heating

Defrost

Fig. 7-6-2

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

minutes.

(2) The defrost operating time is 10 minutes.

7-6-3. Ending condition at defrost operation

(1) When the compressor current becomes 8.0A or

more during defrost operation, the defrost operation stops and the heating 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 interlooked with the PRE-DEF. lamp. So the PRE-DEF. Lamp is off (the fans stop) for about 3 minutes after the [ START ] 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 24 goes off, and the indoor fan starts.

°C or higher

, the PRE-DEF. Lamp

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