Water Fill System; Calculation Of Flow Rate - Electrolux Washing machine Service Manual

7.6 Water fill system

The solenoid valves are powered by the
PCB via two or three triacs. The status
of the pressure switch (empty/full) is
detected by two "sensing" lines".
1. PCB
2. Anti-boiling level
3. 1st level
4. Pre-wash solenoid
5. Wash solenoid
6. Bleach solenoid (certain
models only)
7. Heating element
AB_S Anti-boiling level sensor
L1_S 1st level sensor
7.6.1

Calculation of flow rate

Calculation of the flow rate – necessary to determine the time for the supplementary fill – is performed by
measuring the time that elapses between the closure of the anti-boiling contact on FULL and the closure of
the 1st level contact.
Volume
Flow rate =
Time (T1-T2)
•
Water fill diagram
ELT = solenoid valve
P1 = 1st level
AB = anti-boiling level
rpm = drum rotation speed
Water in = water fill
Phase A: The phase during which the initial fill takes place:
1. Water fill until the anti-boiling pressure switch closes on FULL.
2. Water fill until the 1st level pressure switch closes on FULL: the delivery of the solenoid is
calculated during this phase.
3. Water fill for time Q, which varies according to delivery and cycle phase.
Phase B: If the 1st level pressure switch returns to EMPTY, a supplementary fill is performed until the
pressure switch returns to close on FULL. This phase may be followed by a further timer-
controlled fill.
SOI/DT 2005-07 dmm
Volume = Volume of the tub between the two levels (anti-boiling and
1st level)
T1 –T2 = The time that elapses between the closure of the anti-boiling
and 1st level contacts on FULL
39/59 599 37 22-15