Analogue Pressure Switch Of Water Level Control In The Tub - Electrolux TC2 Service Manual

11.4

Analogue pressure switch of water level control in the tub

General characteristics
The electronic pressure switch is an analogue device that controls the water level in the tub, used in the models
with electronic control system and it is directly connected to the main PCB.
ELECTRONIC PRESSURE SWITCH
Electronic circuit Electrical symbol
The pressure switch is connected via a tube to the pressure chamber.
When water is introduced into the tub, this creates a pressure inside the hydraulic circuit that causes the
membrane to change position. This in turn modifies the position of the core inside the coil, thus changing the
inductance and the frequency of the oscillating circuit.
The PCB recognises how much water has been introduced into the tub according to the frequency.
1 tube
3 oscillating coil
5 core
Operating frequency variation according to the quantity of water in
the tub
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SOI/DT 2010-03 dmm 599 72 84-41