System Regeneration Cycle (8-Cycles Operation) - Pentair AUTOTROL 368 Installer Manual

Installer manual Autotrol 368 (604-606) - Description
3.5

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 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.
Rapid rinse (downflow) — cycle C4
The 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 Rapid 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.
Info
For illustration purpose only. Always verify inlet and outlet marking on the valve.
Ref. MKT-IM-007 / D - 09.10.2020 17 / 60