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8.11.1 "Siphon" effect
If the drain tube is incorrectly positioned, the so-called "siphon effect" may occur, in which case an
alarm is displayed iF0 (see 9.1).
The problem is particularly likely to occur during execution of the "declaration cycle": although the
drain pump shuts down at the end of the (partial) drain phase, water continues to be expelled from the
machine because the drain tube is incorrectly positioned. When this occurs, water loaded by the fill solenoid
during the next phase is directly expelled, so the "full contact" on the pressure switch does not close before
its "time out".
Thus, if alarm iF0 occurs, it is a good idea to make sure the drain tube is correctly positioned as
shown in the instruction manual.
8.12 Regeneration system
Regeneration of the water softening system, which takes around 4 min, is usually performed at the
start of the drying phase.
Every time regeneration is performed (with activation of regeneration solenoid 4), the accumulation
chamber is completely emptied of its contents (about 230 cc of water). Regeneration is controlled by the
electronic control system "Ad Hoc", i.e. not at each washing cycle, but rather at intervals determined by the
level of regeneration selected:
If level [1] is selected, regeneration is never performed and the SALT LED (if featured) always remains
unlit.
If level [10] is selected, regeneration is performed twice during each cycle; first at the end of the washing
phase, and then at the beginning of the drying phase.
The regeneration solenoid (ER) is powered by connectors D9-C1 on the main board and by the contacts
of the door switch (IP).
Some models may feature a salt sensor, whose Reed contact (SS) is connected to G1-G2 connectors of
the board.
When there is no salt, the contact closes and the relative LED lights up (on display board).
8.13 Resin washing
Washing of the resins contained in the softening system is performed at the beginning of each washing
cycle. In practise, the solution of salty water (regeneration water) remains deposited in the resin container
from the end of the last completed cycle until the subsequent cycle.
If the regeneration level is set to [10], washing of the resins is performed once at the beginning of the
washing cycle and then again immediately after the regeneration process performed at the end of the
washing phase:
The regeneration sequence is as follows
a. Drain (30 seconds)
b. Water fill to correct level
c. Drain (10 seconds)
d. Water fill (15 seconds)
e. Complete drain
SOI/TD 2004-11 PR
15/
26
599 36 44-44
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