Installer Manual Fleck 3900 - NXT - Description
20 / 126 Ref. MKT-IM-015 / B - 08.06.2018
3.4.2. UF 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.
Pause & Delay — cycle C1
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.
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 riser tube and up through the resin bed to the drain. The
hardness ions are replaced by sodium ions and are sent to the drain. The resin is regenerated during
the brine cycle. Then the slow rinse phase starts.
Backwash — cycle C3
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.
Rapid rinse — cycle C4
The controller value 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 C5
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.
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