Electrolux w4250n-s User Manual

99

1

2a

2b

5

4

K21

K22

6

3

1

2

5

4

3

Y51

6665 A

6666

Electric heating without fusible cut-out on  
element

The three heating elements in the machine are 
connected to separate phases and switched on 
and off using two serial heating contactors. Hea-
ting contactor K21 is controlled by programme
unit A1, output (x36:7). Heating contactor K22 is
regulated by a standalone mechanical level con-
trol. In order for both contactors to be activated,
the level in the machine must have been appro-
ved by both the level control in programme unit 
A1 and the mechanical level control.
The water level in the machine must be 90 scale
units or more in order for the mechanical level
control to be activated.
The programme unit receives information on the
water temperature in the machine through an 
analogue signal from the temperature sensor
situated in the outer drum. The programme unit 
controls the heating contactors to achieve the 
set water temperature for the current washing
programme.
The mechanical level control prevents the ele-
ment from activating if the programme unit or-
ders heat despite the fact that there is no water
in the drum. 

Steam heating

The steam valve is controlled by the programme 
unit A1, output (X3 36:7).

 1.  Heating elements
2a.  Programme unit A1
2b.  Interlock signal
 3.  Supply voltage
 4.  Temperature sensor
 5.  I/O Board
 6.  Level control

 1.  Steam valve
 2.  Programme unit A1
 3.  Rear control unit
 4.  Temperature sensor
  5.  I/O-card