System Regeneration Cycle (8-Cycles Operation) - Pentair AUTOTROL 604 Installer Manual

Installer Manual Autotrol 368 / 604-606 - Description
3.4.

System regeneration cycle (8-cycles operation)

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 raw water being exchanged on the resin
beads against by sodium ions. The water is conditioned as it passes through the resin bed.
Backwash (upflow) — cycle C1
The flow of water is reversed by the valve and directed down the riser tube and up through the resin
bed. During the backwash cycle, the bed is expanded and debris are flushed to the drain, while the
media bed is remixed.
Brine draw (downflow) & slow rinse — cycle C2
The valve directs water through the brine injector and brine is drawn from the brine tank. The brine
is then directed down through the resin bed and up through the riser tube to the drain. The hardness
ions on the resin beads are replaced by sodium ions and are sent to the drain. The resin is regenerated
during the brine cycle. When the air check valve closes brine draw finishes, and then the slow rinse
phase starts.
Repressurization cycle — cycle C3
This cycle allows the air and water to hydraulically balance in the valve before continuing the
regeneration.
Fast rinse (downflow) — cycle C4
The controller valve directs water down through the resin bed and up through the riser tube to the
drain. Any residual brine is rinsed from the resin bed, while the media bed is recompacted.
2nd Backwash (upflow) — cycle C5
2nd Fast rinse (downflow) — cycle C6
Brine refill — cycle C7
Water is directed to the brine tank at a rate controlled by the refill flow controller, to prepare brine for
the next regeneration. During brine refill cycle, treated water is already available at the valve outlet.
14 / 54 Ref. MKT-IM-007 / A - 16.12.2016