Drain System - Electrolux EDW 503 Service Manual

11. Drain system

The system consists of inner and outer drain hoses and a drain pump, and its function is to transport
the contaminated water as efficiently as pos-sible from the machine to the waste water system of the
buildin
OUTER DRAIN HOSE
The pump performs equally well in both directions of rotation, and the direction in which it
rotates is a matter of pure chance. This also means that the pump is vir-tually proof against
jamming. If some object should enter the pump casing and jam the impellar, the motor will
immediately make a new starting attempt in the op-posite direction. Even if the impellar is
seriously jammed (e.g. by a toothpick), the motor will most probably release the impellar
within about a second. The power consumption of the motor is 23 watt, and the pump
capacity is about 10 I/min.
The internal drain hose is connected to the drain pump. To prevent the risk of the machine
being emptied by siphon action, the hose routes the drain water through a loop running up
to the top of the chassis and then through the outlet at the bot-tom of the machine, to the
outer (visible) drain hose. A hole is provided at the highest point of the inner drain hose for
venting the system.
If the drain hose is permanently connected to a water trap, it is very important that the
inside diameter of the drain system should not be less than 13 mm at any point.
Spares Operation - R.Kurzke 11/06
The drain pump is connected to the chassis at the coarse
strainer and is sealed with an O-ring. The motor is a per-
manent-magnet motor, with the rotor.mounted inside a
plastic housing and the stator fitted to the outside of the
plastic housing. The design is such that the pump has no
traditional shaft seat which always invol-ves the risk of
leakage.
DRAIN CASING
INNER DRAIN HOSE
Anti siphonic device
If the end of the take-off hose
is below the level of the water
in the wash space, a siphon
effect is possible, that is, the
machine runs empty. This is
avoided by the ventilation
through the anti-siphon valve.
- 18 -
DRAIN PUMP
599 528 133 EN