Toshiba RAS-13SKHP-ES2, RAS-13S2AH-ES2 SERVICE MANUAL

SERVICE MANUAL

AIR CONDITIONER

SPLIT WALL TYPE

FILE NO. SVM-10026

RAS-13SKHP-ES2 / RAS-13S2AH-ES2

February, 2010

CONTENTS

1. SPECIFICATIONS

2. CONSTRUCTION VIEWS

2-1 Indoor Unit

2-2 Outdoor Unit

3. WIRING DIAGRAM

SPECIFICATION OF ELECTRICAL PARTS

5. REFRIGERATION CYCLE DIAGRAM

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 Drescription 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

FILE NO. SVM-10026

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 (Including the Indoor P.C. Board)

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

- 1 -

1. SPECIFICATIONS

FILE NO. SVM-10026

MODEL

ITEM

Capacity

Phase

Power source

Hz Power consumption kW Power factor % Running Indoor A Current Outdoor A 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

(One way)

Maximum height

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

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

m Fan motor output W Compressor Model

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

RAS-13SKHP-ES2 / RAS-13S2AH-ES2

Cooling

220V 240V

3.73 3.78 4.15

Heating

220V 240V

4.25

1∅

220 − 240

1.14 96

1.19

1.14 1.18 96 86

0.15

5.25

5.65 5.25 5.60 22

2.0

41/38/35/33/31

50 51 50 51

R410A

1.05

Capillary tube

∅12.7

Flare connection

∅6.35

Flare connection

15*

RAS-13SKHP-ES2

275 790 205

Finned tube

Cross flow fan

h h h

600 430 380

620 520 400

Filter (RB-A620DE)

RAS-13S2AH-ES2

550 780 290

Finned tube

Propeller fan

2120 2200 2120 2200

PA145G1C-4FT1

1100

Fuse, Overload relay

Automatic louver

15 ~ 43

−10 ~24

− 2 −

Note : 1

Capacity is based on the following temperature conditions.

FILE NO. SVM-10026

Temperature

Indoor unit inlet air temperature

Outdoor unit inlet air temperature

Note : 2

*1 No need to charge extra refrigerant.

Condition

Cooling Heating

(DB) 27°C20°C

(WB) 19°C15°C

(DB) 35°C7°C

(WB) 24°C6°C

JIS C9612

- 3 -

2-1. Indoor Unit

FILE NO. SVM-10026

2. CONSTRUCTION VIEWS

790

Front panel

Knock out system

275

Air filter

116

Heat exchanger

Installation plate hanger

Air inlet

62 69

193480

205

Knock out system

Wireless remote controller

157

Installation plate hanger

Connecting pipe (0.35m)

(Flare 12.7mm)

84.5

Minimum

distance

to wall

275

170 or more

Hanger

84.5 150 84.5

621

235

215

Hanger

Minimum

distance

to ceiling

235

215

160.5 160.5 150

Center line

- 4 -

Drain hose (0.50m)

Connecting pipe (0.40m)

6.35mm)(Flare

84.5

65 or more

Minimum

distance

to wall

170 or more

Hanger

Installation plate outline

Remote controller holder

190

125

2.2. Outdoor Unit

600

320

306

A detail Drawing (Back leg)

R5.5

6 hole

320

25 Drain outlet

FAN-GUARD

436

FILE NO. SVM-10026

108 125

306

320

11 x 14

(For 8 -

Hole

10 anchor bolt)

6 hole

11x14 hole

B Detail Drawing (Front leg)

36 50

COVER-PV

290

550

275

320 342

Electrical part cover

Liquid side (Flare 6.35)

Gas side (Flare 12.7)

ervice port

Z View

9060090

129

100 or more

321

100 or more

Air outlel

600

Air intlel

600 or more

− 5 −

600 or more

4x 11 Long holes(For 8- 10 anchor bolt)

3. WIRING DIAGRAM

FILE NO. SVM-10026

OUTDOOR

OUTDOOR TERMINAL

TERMINAL BLOCK

BLOCK

COMPRESSOR

BLK

PNK

WHI

(L)2(N)

(L)

RED

(N)

BLU

SOLENOID COIL

CAPACITOR

RED

CAPACITOR

313

BLU

FAN

FAN MOTOR

MOTOR

WHI

− 6 −

CHASSIS

BLK

INDOOR

OUTDOOR

FILE NO. SVM-10026

4. SPECIFICATION OF ELECTRICAL PARTS

4-1. Indoor Unit

No. Parts name Type Specifications

1 Fan motor (for indoor) 2 Thermo sensor (TA-sensor) 10k at 25 C 3 Micro Power Module (M01) 4 Microcontroller unit (IC30) 5 Heat exchanger sensor

(TC-sensor) 6 Line filter (L01) 7 Bridge rectifier (DB01) DB105G 1A, 600 V 8 Capacitor (C03) 9 Fuse (F01) BET 6.3A T6.3A, 250VAC

10 Varistor (R06, R07) 11 Resistor (R01 ) RF-2TK5R6 5.6 , 2 W 12 Louver motor MP24Z3T 12VDC 13 Relay (Comp., RY01) 14 Relay (Fan, RY03) 15 Relay (Solenoide, RY04)

AFN-220-20-4D

GPS-9W-AA

TMP87CM40ANG

LC*SS11V-R06270

400MXC47MEFCSN20X20

SR561K14DO

G4A-1A-E-CA

202N-1AC-C E 202N-1AC-C E

Rating 3A/AC250 V, 12VDC

AC Motor with 145 C thermo fuse

DC 390V, Secondary DC 12V

10k at 25 C

27mH, 600mA

47mF, 400 V

560 V

Rating 25A/AC250 V, 3-48VDC

4-2. Outdoor Unit

No. Parts name

1 Compressor

Fan motor

(for outdoor)

Running capacitor

(for fan motor) Running capacitor

(for compressor) Solenoid coil

(for 4-way valve)

(for Heat pump

model)

Type

Output (Rated) 1100W, 2poles, 1 phase, 220 − 240V, 50Hz

PA145G1C-4FT1

WLF-240-42A

DS451155NPQB AC 450V, 1.5µF

B32332I5306J063 AC 450V, 30µF

STF-01AJ503H1

Winding resistance (Ω ) C-R C-S

(at 20°C) 2.67 4.48 Output (Rated) 42W, 6poles, 1 phase, 220 − 240V, 50Hz Winding resistance (Ω) Red-Black White-Black (at 20°C) 188

AC 220 − 240V, 50Hz

Specifications

289

- 7 -

5. REFRIGERATION CYCLE DIAGRAM

FILE NO. SVM-10026

Indoor unit

Cooling

0.39 m (Connecting pipe)

Æ12.7

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

Cooling

Heating

Packed valve

(Æ12.7)

Heating

4-way valve

Cooling

Compressor

PA145G1C-4FT1

Accumulator

Heat exchanger

Cross flow fan

Capillary tube

Æ1.5 x 1500

Packed valve

(Æ6.35)

Capillary tube

Æ1.0 x 500

0.49 m

(Connecting pipe)

Æ6.35

Heat exchanger

Refrigerant

R410A : 1.05 kg.

Cooling Heating

Propeller fan Outdoor unit

Mark ( ) means check points of Gas Leak.

Ambient temp.

50Hz

Standard

pressure

(MPaG)

Surface temp. of heat

exchanger interchanging

pipe

(°C)

Fan speed

(indoor)

conditions DB/WB

(°C)

Indoor Outdoor

Standard 2.72 46.9 High 20/15 7/6

Heating Overload*1

Low temperature 2.51 37.2 High 20/

3.70 59.9

Low 27/- 24/18

-10/-10

Standard 0.91 9.5 High 27/19 35/24

Cooling Overload 1.26 14.6 High 32/23 43/26

Low temperature 0.77 1.5 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.

- 8 -

6. CONTROL BLOCK DIAGRAM

FILE NO. SVM-10026

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

Relay

RY01

M.C.U.

ON/OFF

Signal

Relay

4-Way Valve

ON/OFF

Signal

RY03

Operation

Display

Timer

Display

Filter Sign

Display

Hi Power

Sign Display

PRE DEF.

Sign Display

Indoor Fan

Motor

Louver

ON/OFF

Signal

Louver

Motor

Relay

RY04

220-240 V~, 50Hz

REMOTE CONTROL

Operation Mode Selection

AUTO, COOL, DRY, HEAT, FAN ONLY

Compressor 4-Way Valve

Remote Control

Operation ( )

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

Outdoor Fan Motor

Infrared Rays

− 9 −

7. OPERATION DESCRIPTION

FILE NO. SVM-10026

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)

10 21

TOSHIBA

PRESET

TEMP

ONE-TOUCH

QUIET

SWING

FIX Hi-POWER ECO

6 7

TIMER

SLEEP

CHK

FILTER

OFF

CLOCK

FAN

MODE

COMFORT

SLEEP

CLR

SET

15 16

− 10 −

FILE NO. SVM-10026

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.

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. 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.

- 11 -

FILE NO. SVM-10026

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. 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, control the four-way valve and

outdoor fan motor control)

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 7-2-3)

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 (7-2-1) Cooling

Indication

L L+

M M+

Fan speed

Low

(L + M) / 2

Med

(M + H) / 2

High

Table (7-2-2) Heating

Indication

L L+

M M+

Fan speed

Low

(L + M) / 2

Med

(M + H) / 2

High

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

Cooling UH H M

OPERATION

MODE

rpm

Air flow volume (m3/h)

Fan only

Dry

Heat HH

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, and heat exchanger temperature.

FAN T AP

M+

H M L-

M+

1000

L+

M+

1250

1300

620 600 550 520 430 400 400 350

1150 1100

L+

L-

L UL SL

850

- 12 -

L-

750 UL650 SL600

800

380

UL SL

310

280

550

260

500

240

FILE NO. SVM-10026

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, 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

(Room temp.) (Preset temp.)

Preset temp.

0.5

Fig. 7-3-2

display lamp

OPERATION

+3 +2.5 +2

+1.5 +1 +0.5

(Room temp.) − (Preset temp.)

Preset temp.

(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

-0.5

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]

FILE NO. SVM-10026

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. 7-3-4.

° 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. 7-3-4

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. 7-3-6.

° C

0.5

(Room temp.) (Preset temp.)

OFF

Compressor

OFF

4-way valve

Outdoor fan

OPERATION

display lamp

Fig. 7-3-6

(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

-0.5

-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 Linear approximation from M+ and L+)

Fig. 7-3-7

FILE NO. SVM-10026

(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

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

Fan speed AUTO Fan speed MANUAL

Normal AUTO

Line-approximate H and SL with Tc.

Stop

L-H (Up to setting speed)

Line-approximate H and SL with Tc.

Stop

[In starting and in stability]

In starting

FAN • Until 12 minutes

AUTO

passed after operation start

• When 12 to 25 minutes passed after operation

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

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

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

Fan only operation

-1

Heating operation

(Room temp.) − (Preset temp.)

FAN • Room temp. < Set

Manual

temp.–4°C

• Room temp. Set temp. –3.5°C

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.

Fig. 7-3-9

7-4. Drescription of Safety and Reliability Prevention Function

FILE NO. SVM-10026

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)

Compressor Outdoor fan

Less than 5°C continues

for 5 minutes

OFF

Fig. 7-4-1

7-4-2 High-Temperature Limit Control

7-4-3. 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.

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. 7-4-3. 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.

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.

Compressor

OFF

Outdoor fan

OFF

Heat exchanger temp.

(°C) 60

53 52

Fig. 7-4-2

xchanger temp

Indoor heat e

- Room temp

Fig. 7-4-3 (Indoor fan speed : M)

Cumulative compressor operating time

Defrost operation time control

FILE NO. SVM-10026

(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.)

minutes

Heating

minutes

Defrost

Heating

Max 6 minutes

minutes

Defrost

1 cycle

Heating

minutes

Defrost

Heating

10 minutes

Defrost

Fig. 7-4-4

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

minutes.

(2) The defrost operating time is 10 minutes.

Ending condition at defrost operation

(1) When the compressor current becomes 5.40A 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 [ ] 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

7-4-4. Current Limit Control

The microcontroller 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 operation)

Control is performed as shown below by detecting the compressor operating current with a current sensor (C.T).

Input current

11.0A I4

10.0A I3

FILE NO. SVM-10026

Compressor Outdoor fan More than I4 continues for 3 seconds

OFF

More than I3 continues for 5 minutes

OFF

(2) Current limit control (Heating operation)

Control is performed as shown in Fig. 7-4-6

Input current

11.0A I4

10.0A I3

6.45A I2

5.40A I1

Fig. 7-4-5

Compressor Outdoor fan

More than I4 continues for 3 seconds

OFF

More than I3 continues for 5 minutes

OFF

ON OFF

Fig. 7-4-6

- 18 -

FILE NO. SVM-10026

7-5. One-Touch Operation

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

Fan Operation

AUTO

*AUTO/L

*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.

5) Fan is controlled as diagrom.

Time after operation starts (min)

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