Water Fill System; Calculation Of Flow Rate - Electrolux Washing machines with EWM 1000 PLUS Service Manual

6.5 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 (some models)
7. Heating element
AB_S Anti-boiling level sensor
L1_S 1st level sensor
6.5.1

Calculation of flow rate

Calculation of the capacity – 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 2006-11 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
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