Structure Of Hydraulic Circuit; Base - Electrolux Evolution Service Manual

The washing system is carried out by two main sections:
- The BASE, designed to contain liquids
- The IWMS water softening system.
The base is not only the main load-bearing structure of the appliance and of the main functional and
electrrical components, but also houses part of the hydraulic circuit.
THE BASE HOUSES THE FOLLOWING:
1. SUMP ASSEMBLY
The sump is essentially a container fitted with a number of ducts; its function is to collect and distribute
the water to be used to wash the dishes in the appliance.
The sump is connected hydraulically by hoses to the IWMS system and the delivery tubes to the two
spray arms.
The sump also contains components divided into two sections: WASHING and DRAIN.
WASHING SECTION: Only the water which passes through the large circular filter circulates in this
section. The path is a closed circuit, since once ducted into the sump, the water is pumped by the motor
(washing impeller) to the two rotating spray arms, sprayed onto the dishes, and then returns by gravity
to the filter.
DRAIN SECTION: The drain section receives water containing the residual material removed from the
dishes and ducted through a tangential filter washing nozzle fitted to the lower spray arm. The residue is
trapped in this sector, and is thus prevented from passing into the washing sector.
2. SALT CONTAINER
Contains the salt used for the regeneration process. Connected by a hose to the IWMS.
3. NON-RETURN VALVE (normally closed)
This membrane-type valve is positioned externally on the sump and is connected directly to the drain
hose. Its function is to separate the hydraulic circuit inside the tub from the external section.
Correct operation of the non-return valve contributes to the final washing result, in that it
- prevents water from outside the appliance (i.e. from the sink, drain siphon etc.) from entering the tub
through the drain hose.
- prevents air from being sucked in through the drain hose, which might create turbulence inside the
sump.
- reduces to a minimum the quantity of water remaining in the sump at the end of each phase of the
cycle.
DESCRIPTION OF HYDRAULIC CIRCUIT

BASE

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