Multiple Valves, System On-Demand (System #14) - Pentair FLECK 3150 NXT Installer Manual

Installer manual Fleck 3150 NXT/NXT2 - Installation
is complete, the regenerated unit will enter in standby. Standby on each tank is
controlled by the drive output terminals (24 VAC or 24 VDC, see UDM on Electrical
connections [}Page 52]) on the NXT/NXT2 circuit board.
Valve
Tank
5.7.7

Multiple valves, system on-demand (System #14)

This system type may be used to build systems from 2 to 4 valves for NXT controller,
2 to 8 valves forNXT2. Each valve must be equipped with a water meter.
The number of tanks in service depends on the flow rate and on programmed settings.
5.7.7.1 Examples of a four units system
1. One tank is in service at all time (the "primary tank").
Valve
Tank
2. The total flow rate to the primary tank increases and exceeds the first
programmed trip point. The flow rate demand stays above the trip point for the
preset delay time. The next tank (with the least remaining volume) changes from
standby into service. This then splits the total flow between two meters.
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Inlet
Service Service
Inlet
Service Stand-By
Primary
tank
Service Stand-By
100%
Stand-By Stand-By
Ref. MKT-IM-010 / C - 18.10.2019
Outlet
Check valve
Meter
Outlet
Check valve
Meter