Control Of The Washing Pump; Heating; Integrated Detergent Dispenser; Drain - Electrolux “DIVA” EDW 500 Service Manual

8.8.1

Control of the washing pump

The washing pump (PL) is powered by the electronic control (connector D3-D11).

8.9 Heating

The heating element is enclosed in a protective tube, and is used to heat the washing water (but
does not switch on during the drying phase). The heating element is fitted to the outlet of the washing pump
and connected to the duct which feeds the upper spray arm.
The heating element (RR) is powered by electronic control (connector A1) and by the level pressure
switch (RL), which must be set to "FULL" (contact closed on 1-3).
Two safety thermostats are fitted to the heating element:
an automatic-reset thermostat which intervenes at 98ºC
-
- a thermostat with a thermal fuse (206ºC)
The temperature of the water is controlled by the main circuit board via an NTC sensor (ST) which is
connected to connectors H1-H3.

8.10 Integrated detergent dispenser

The detergent dispenser is a plastic container consisting of two
separate sections. The first (A) contains the detergent; the second (B)
contains the Rinse-aid.
The dispenser is of the single-coil type, and uses a single electrical
coil, connected to a mechanical system, for both functions.
When the coil is energized, it actions the mechanism via a series of
levers to introduce detergent in a determined sequence (first detergent, then
rinse-aid).
The coil of the detergent dispenser (DD) is powered by an electronic control via connectors E1-E3 at
certain points during the cycle, thus ensuring correct dosage.
Some models feature a rinse-aid sensor whose reed contact (SB) is connected to connectors G3-G4
on the circuit board.
The absence of rinse-aid causes the contact to close, which lights the corresponding LED (on the
display board).

8.11 Drain

The drain pump (PS) is powered by connectors C1-D1 and via the contacts of the switch door (IP).
At the end of the drain phase, a control procedure is performed to check that the contact of the level
pressure switch is open on EMPTY. If this is the case, the appliance proceeds to the subsequent phase.
If, as a result of a problem in the drain phase, the pressure switch contact remains closed on FULL
(i.e. if there is water in the hydraulic circuit), the drain phase is repeated.
On completion of this second drain phase, the status of the pressure switch is again checked. If it is still
closed on FULL, alarm [i20] is generated (failure to drain). The time-out for each of these two phases is 120
seconds.
N.B. The washing programmes always begin with a drain phase.
SOI/TD 2004-11 PR 14/ 26
B
A
599 36 44-44