Autotrol 255 Manuel D'utilisation page 6

System Regeneration Cycle (7-Cycle Operation)
1. Service (Downflow) — Cycle C0
Untreated water is directed down through the resin bed and up through the riser
tube. The hardness ions attach themselves to the resin and are removed from the
water. The water is conditioned as it passes through the resin bed.
2. Backwash (Upflow) — Cycles C1, C6
The flow of water is reversed by the control valve and directed down the riser tube
and up through the resin bed. During the backwash cycle, the bed is expanded and
debris is flushed to the drain.
3. Brine/Slow Rinse (Downflow) — Cycles C2, C3
The control directs water through the brine injector and brine is drawn from the
regenerant tank. The brine is then directed down through the resin bed and up
through the riser tube to the drain. The hardness ions are displaced by sodium ions
En
and are sent to the drain. The resin is regenerated during the brine cycle. Brine draw
is completed when the air check closes.
4. Repressurize Cycle (Hard Water Bypass Flapper Open) — Cycle C4
This cycle allows the air and water to hydraulically balance in the valve before conti-
nuing the regeneration.
5. Fast Rinse (Downflow) — Cycles C5, C7
The control directs water down through the resin bed and up through the riser tube
to the drain. Any remaining brine residual is rinsed from the resin bed.
6. Brine Refill — Cycle C8
Brine refill occurs during a portion of the fast rinse cycle. Water is directed to the
regenerant tank at a controlled rate, to create brine for the next regeneration.
Figure 1
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