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Installer manual Fleck 3150 NXT/NXT2 - Description
3.5
System regeneration cycle
Info
This valve allows to do filtration, down flow and up flow regenerations.
3.5.1
Downflow 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 [BLFC], 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/NXT2 controllers. The factory value is set
to 0 minute.
Info
For illustration purpose only. Always verify inlet and outlet marking on the valve.
26 / 190
Ref. MKT-IM-010 / F - 16.01.2023
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