438 9150-41/03
04.03
40
40. Heating
4
Service
Manual
2
Fig.
2
3
Fig.
3
Function
Electric heating
The three heating elements in the machine are
connected to separate phases and are switched
on and off using one or two heating contactors,
K.21 and K22 (two contactors are used for higher
heating power). The heating contactors are
controlled by the programme unit A1 via output
X8:1 on I/O card 1 A11. The control signal is fed
via the communication card A21.
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.
When there is no water in the drum, the
programme unit prevents switch-on of the
heating elements. If an error would nevertheless
cause the elements to switch on, a slow-blow
fuse triggers to switch them off again.Then the
heating element has to be changed.
Steam heating
The steam valve is controlled by the programme
unit A1, output (X3 36:7). The control signal
travels via the communication card A21.
5205
Programme
unit Al
Card
A21
Heating
elements
Temperature
sensor
Voltage supply
K21
5202
Heating
elements
Voltage supply
K21
K22
Programme
unit A1
Card
A21
Temperature
sensor
Programme
unit A1
Card
A21
5208
Rear control unit
Steam
valve
Y51
Temperature sensor
Содержание W3105H
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