Operation; Static Fill; Dynamic Fill - Electrolux 5000 Series Service Manual

In order to address service issues with the Electrolux 5000 Series dishwasher, the
primary elements of its operation are described below, as well as its physical
components.

STATIC FILL

The cycle begins by activating the drain pump, ensuring the sump is empty.
Operation then proceeds to the fill stage where the fill valve regulates inlet water to
1.08 GPM between 20 and 120 psi. A fill hose is attached to the fill valve and
clamped to the bottom of an air gap mounted on the left hand side of the tub. (The
air gap prevents the siphoning of wash water back into the water supply system
should the water pressure drop to less then atmospheric pressure.) The inlet
water enters the tub through the vent opening on the left sidewall of the tub. As the
fill continues, both the time of the fill and the amount of water in the sump are
monitored by the electronic control.
The pressure switch assembly mounted to the right side front frame has two
pressure switches; a low water level and a high water level switch. The contact in
the low water level switch is open until the water reaches the proper level in the
sump. At this point, the switch closes (neutral to P3-9), starting the Dynamic Fill.

DYNAMIC FILL

The closed circuit from the pressure switch starts
the wash motor. The wash motor gains speed at
the rate of 100 RPM/second until full speed is
attained. The water level inside the sump falls as
the wash motor gains speed. This opens the
circuit on the low level pressure switch, allowing
the water valve to introduce more water to the tub.
Once the wash motor reaches full speed, the inlet
water continues to fill until the low level pressure
switch is reactivated (neutral to P3-9). This
completes the fill phase of the cycle.

OPERATION

Pressure Switch Assembly
High
water
level
switch
Figure 1
5
Low
water
level
switch