12

10

9003

12

Type

Edition

Page

 

Service

12. Function Sequences

Manual

Heating

Contactor K21 (11) controls the heating elements on electrically heated machines. Steam heated machines have steam valve Y5 (11).

Heating cannot take place until the drum is filled with water so that the level control shuts off (see function diagram ”Water filling”). Voltage is then received by the heating function, point E to the right in the diagram.

The timer is fitted so that heating can occur during both prewash and main wash cycles (row 1b (10) closes during both prewash and main wash). For program P11, described here, heating is not used during prewash. The timer advances past this program stage as follows:

Row 10b (6) is closed during prewash.

When the timerr reaches stage 3, it stops (this stop is preset in the programmer) to wait for heating to start, if called for.

However, in stage three, row 38 (8) closes. The coil for rapid advance (9) receives voltage and advances the timer to stage 4 without heating occurring.

During the main wash, water is heated as follows:

One of rows 9-12 (2)-(5) in the program selector will close depending on which program is selected. This controls which contact in the thermostat (7) will stop the heating process.

When the timer reaches stage 12, it stops (this stop is preset in the programmer) to wait for the heating to be completed.

Since rows 5b (1) and 1b (10) are closed at stage 12, relay K21/valve Y51 (11) receives voltage and heating begins.

Row 38 (8) is also closed at stage 12 and when the correct temperature is reached (the change-over contact in the thermostat trips) the coil for rapid advance (9) receives voltage resulting in the timer advancing to stage 13.

The thermostat has an hysteresis of approx. 4°C which means the contact returns to its original position when the wash water temperature falls 4°C below the preset value. Rows 5b (1) and 1b (10) are closed during the entire main wash cycle. This results in the water being reheated to the correct temperature if the temperature should fall more than 4°C below the correct level during washing.

Sequence diagram

 

 

 

 

 

 

 

Pre wash

 

 

Drain

 

 

1

2

3

4

5

6

7

8

1b. Elements

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5b. Temp. Main wash

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10b. Level 2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

38. Rapid adv., Temp +

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(30'')

30''

 

P+ T+

4-5'

1'

30''

L+ 30''

3''

 

 

 

 

 

 

 

 

 

 

 

 

down

Drain

Rinse1

Drain

 

 

 

Drain/

Extract.

 

 

 

Drain/ Extract.

 

 

 

Stop

 

Extract.

 

 

 

 

 

Open

Start

 

 

 

 

 

 

 

 

 

 

 

 

 

Cool

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rinse 4

 

Drain/

 

 

 

 

 

 

 

 

 

 

 

 

Main wash

 

 

 

 

 

 

 

 

Rinse 2

 

 

Rinse 3

 

 

 

 

 

 

 

 

Spin down

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9 10 11 12 13 14 15 16 17 18 19 20

21 22 23

24

25 26

27

28 29 30

31 32

33 34 35

36 37

38 39 40

41 42

43

44 45 46

47 48 49 50

51

52

53

54

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

27'' 30'' P+ 3' T+

0-1' 1' 1' 1'

1' 5' 1' 1' T- T- 0-1'

1'

2' P+ 1'

L+ 1'

1' 1' P+ 1' L+ 1'

30''

30'' P+ 1' P+ 1'

L+ 1' 30'' 30''

P+ 30'' P+ 30'' STOP

30''/1'

L+ 1' 1' 3'

3'' L+ 27'' 3'' 27''

30'' 2'

O/S

1438

Page 55
Image 55
Electrolux W230, W75, W160, W100 service manual Heating, 1438