Installer Manual Fleck 3900 - NXT - Installation
Ref. MKT-IM-015 / B - 08.06.2018 47 / 126
5.7.5. Multiple valves, alternating (System #9)
This system works with 2 to 4 valves.
One, two or three tanks online supplying treated water, one tank in standby. Each unit in the system
has its own flow meter. The regeneration of a unit will begin after the other controller has left standby
and returned to service. When the regeneration cycle is complete, the regenerated unit will enter in
standby. Standby on each tank is controlled by the drive output terminals (24VAC, see UDM on
chapter 5.9. Electrical connections, page 52) on the NXT circuit board.
5.7.6. Multiple valves, demand (System #14)
This system works with 2 to 4 valves and operates as part of a multi-tank regeneration system. Each
tank in the system must have a flow meter.
The number of tanks in service depends on the flow rate.
5.7.6.1 Examples of a four units system
1. One tank is in service at all time (the "primary tank").
Valve
Tank
Inlet
Outlet
Stand-By
100%
Meter
Check valve
ServiceServiceService
Valve
Tank
Inlet
Outlet
Stand-By
Meter
Check valve
Stand-ByStand-ByService
Primary
tank
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