Electrolux EDW 1000 Service Manual page 15

5.1 WATER FILL - FUNCTIONAL SYSTEM
For dishwashers fitted with motors with tachimetric sensors (1.5 New Generation models), the
electronic control system is designed to control the water fill by identifying the signals received from
the pressure switch (which thus acts as a pressure sensor).
The tachimetric sensor which signals the speed of the motor to the electronic control system is
independent of the water fill level control function.
5.1.1 BLOCK DIAGRAM OF HYDRAULIC CIRCUIT
KEY:
1) Control board
2) Fill solenoid
3) Anti-overflow device
4) Sump
5.1.2 DEFINITION OF THE WATER LEVEL
The pressure switch is connected pneumatically to the IWMS. Inside the IWMS, an air trap (pressure
chamber) communicating via a tube serves to determine the level of the water.
Inside the water level circuit, the air pressure is proportional to the quantity of water present in the
sump; when the pressure exceeds the predetermined threshold, the pressure switch - which is
also a pressure sensor - switches the electrical contact to "FULL".
In order to maintain this condition, in dynamic operation (washing), the stability of the water level is
guaranteed so that the pressure switch remains on "FULL".
In this way, it is possible to determine with certainty that the status of the pressure switch
determines the sequence of the washing cycle according to its position ("FULL" or "EMPTY",
which indicate the presence or absence of water in the appliance); during the various phases,
switching of the pressure switch is as follows:
SPECIFIC PHASES
During the fill phase
During the wash phase
During the drain phase
TSE-P 02.01 LF
5) Pressure switch
6) Sump
7) Wash/Drain motor
8) Tachimetric sensor
WASHING CYCLE SEQUENCE
PRESSURE SWITCH STATUS
"empty" > "full"
"full" (maintenance)
"full" > "empty"
15/35
STABILITY OBJECTIVE
The water level that has been
reached
The presence of water
The absence of water
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