Control Of Drain - Electrolux Evolution Service Manual

WATER FILL CONTROL SYSTEM
This system refers to the path taken by the water inside the IWMS during the fill phase, starting from the
inlet connected to the fill solenoid and passing through the entire internal circuit until it reaches the tub.
The fill control system consists of the following sub-systems:
- VOLUMETRIC CONTROL OF WATER FILL
- CONTROL OF THE LEVEL OF WATER IN THE TUB
- CONTROL OF THE ANTI-OVERFLOW LEVEL.
VOLUMETRIC WATER CONTROL
This new system provides VOLUMETRIC control (in all phases of the water fill) of the quantity of water
entering the appliance, and is based on a volumetric distributor which ducts a small quantity (1/6) of the
total water fill into a special reservoir.
When the "1/6" reservoir is full, the remaining "5/6" of the water flows into the tub.
The system consists of:
11. Volumetric distributor
12. Volumetric dosing reservoir
12. Drain siphon (inside volumetric reservoir)
13. Reset solenoid (resets the reservoir)
CONTROL OF WATER LEVEL (EMPTY / FULL)
The water level is determined by a traditional pressure switch (14) which is connected by a tube to the
coupling on the pressure chamber and positioned at a height such as to monitor both the water in the
volumetric reservoir and the level of the water in the tub.
The signal received from this coupling acts directly on the pressure switch, which switches to "full" (1 - 3),
thus disconnecting the solenoid valve.
Once the level is reached, the pressure switch signal remains "full" (1 - 3), since the level siphon (15) is
filled and maintains the pressure in the chamber.
CONTROL OF ANTI-OVERFLOW LEVEL
To the side of the pressure chamber of the pressure switch, at a different height but communicating, a
second pressure chamber is connected to the anti-overflow device (16).
If the level of water in the tub increases, the signal from this coupling directly actions the fill solenoid, and
closes the mechanical part.
16