Pentair FLECK 3150 NXT, Installer Manual

Page: 20 / 182

Installer manual Fleck 3150 NXT/NXT2 - Description
20 / 182 Ref. MKT-IM-010 / C - 18.10.2019
3.5 System regeneration cycle
Info
This valve allows to do filtration, down flow and up flow regenerations.
3.5.1 DF regeneration cycle (5-cycles operation)
Service — normal use
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 by sodium ions. The water is conditioned as it
passes through the resin bed.
Backwash — 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 is
flushed to the drain, while the media bed is remixed.
Brine draw & slow rinse — cycles 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 drawing finishes, and then the slow rinse phase starts.
Rapid rinse — cycle C3
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 re-
compacted.
Brine tank refill — cycle C4
Water is directed to the brine tank, at a rate controlled by the refill controller, to create
brine for the next regeneration. During brine refill, treated water is already available at
the valve outlet.
Pause & Delay — cycle C5
The valve is in stand-by until the end of the cycle. In multiplex, if the brine tank is
shared, allows to leave a brine preparation time.
Info
The cycle Pause & Delay is optional with NXT controller. The factory value is set to
0 minute.
Info
For illustration purpose only. Always verify inlet and outlet marking on the valve.