Multiple Valves, Alternating (System #9); Multiple Valves, Demand (System #14) - Pentair FLECK 3150 NXT Installer Manual

Installer Manual Fleck 3150 - NXT - Installation

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 49) on the NXT circuit board.
Inlet
Valve
Tank
Service

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").
Inlet
Valve
Tank
Service
Primary
tank
44 / 122
Service Service
Stand-By Stand-By
Outlet
Check valve
Stand-By
100%
Meter
Outlet
Check valve
Stand-By
Meter
Ref. MKT-IM-010 / B - 28.05.2018