Strainer System - Electrolux EDW 503 Service Manual

9.

Strainer system

The strainer system is one of the systems which are most important to the performance of the
dishwasher.
The design of this system is largely decisive to whether the dishwasher will be able to perform its
most fundamental task: to wash the dishes clean.
The strainer system must trap particles of food, etc. and ensure that these particles will not be
recircu-lated and deposited back on the dishes.
Another consumer requirement is that the strainer system must be self-cleaning, so that it will not
be necessary to wash the strainers by hand every time or every other time the dish-washer is
used.
The strainer system consists of two parts which
jointly contain three different strainers, each of
which with its own particular task.
Coarse strainer
The fine strainer consists of a shaped stainless
steel plate which is perforated with 0.5 mm
diameter holes and is retained in a plastic frame.
The dishwashing water passes through this
strainer about 420 times during a normal
dishwashing programme.
The bottom of the chassis is designed in such a
manner that particles will continually be flushed
away to the coarse strainer. All particles larger
than 0.5 mm will be trapped, and the water flowing
through the strainer will thus be virtually clean.
The performance of the strainer is highly
dependent on the suction of the circulation pump
Fine strainer
being equally distributed over the entire strainer
area. If the suction is higher at any one point,
particles will be drawn through the fine strainer at
that point, and they would then disintegrate and
would be very dif-ficult to trap.
It is also very important for the plastic frame of the fine strainer to seal well against the chassis, so that
particles will not by-pass the strainer and be deposited back on the dishes.
The fine strainer also includes a small plastic boss. This is designed to prevent the build-up of pressure
and air cushions under the strainer. An air cushion under the fine strainer would otherwise prevent the
water from flowing through the fine strainer, and insufficient water would then be supplied to the cir-
culation pump.
Particles are thus flushed continuously down into the coarse strainer, where they are retained until
the water is pumped out to drain. The coarse strainer is also designed to trap larger particles, such as
pieces of meat, toothpicks, etc.
To retain the good dishwashing properties of the machine, the consumer must empty and rinse the
strainers as soon as they show signs of clogging.
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Spares Operation - R.Kurzke 11/06 599 528 133 EN