Duplex Alternating Delayed System (System #8) (Nxt2 Only); Multiple Valves, Parallel System With Standby Unit (System #9) - Pentair FLECK 3150 NXT Installer Manual

During normal operation, the controller of each valve displays the time of day and the
remaining volume. The remaining volume displayed drops with water consumption to
reach zero. When this happens, the regeneration starts immediately. The valve in
service sends a signal to the valve in standby that goes in service. Once this occurs, the
valve with exhausted capacity starts its regeneration process.
5.7.5

Duplex alternating delayed system (System #8) (NXT2 only)

This system works with 2 valves and a meter.
During normal operation, the controller of each valve displays the time of day and the
volume of water remaining. The remaining volume displayed drops with water
consumption to reach zero. When this happens, the valve in service books a
regeneration that will start at the programmed regeneration time. When the
programmed regeneration time is reached, the valve in service sends a signal to the
valve in standby that moves into service position. Once the 2nd valve is in service,
regeneration of the exhausted valve starts.
5.7.6 Multiple valves, parallel system with standby unit (System #9)
This system type may be used to build systems from 2 to 4 valves for NXT controller,
2 to 8 valves for NXT2. Each valve must be equipped with a water meter.
One to three tanks in service (NXT) or one to seven tanks in service (NXT2) supplying
treated water, one tank in standby. The regeneration of an exhausted unit can start only
after the unit in standby has returned to service position. When the regeneration cycle
Ref. MKT-IM-010 / C - 18.10.2019
Installer manual Fleck 3150 NXT/NXT2 - Installation
Inlet
Valve
Tank
Inlet
Valve
Tank
Outlet
Meter
Check valve
Outlet
Meter
Check valve
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