GE Autorol 255 Valve / 400 Series - Manual (Page 4)

4
System Regeneration Cycles (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 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 and are sent to the drain. The resin is regenerated during the brine cycle.
Brine draw is completed when the air check closes.
4. 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.
5. Brine Refill (Downflow) — 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.
6. Repressurize Cycle — (No Flapper Open), Cycle C4:
This cycle closes all flappers for a short time to allow the air and water to
hydraulically balance in the valve before continuing the regeneration.