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Installer Manual Fleck 3900 - NXT - Description
3.4.
System regeneration cycle
Note
This valve allows DF and UF regenerations.
3.4.1. 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 controller 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.
Note
The cycle Pause & Delay is optional with NXT controller. The factory value is set to 0 minute.
Note
Used in multiplex, if the brine tank is shared, to let time for the brine preparation.
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Ref. MKT-IM-015 / B - 08.06.2018
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