Duplex Alternating Immediate System (System 7) - Pentair FLECK 2910 NXT Installer Manual

Installer manual Fleck 2910 NXT/NXT2 - Installation
During normal operation, the controllers of each valve display the time of day and the volume of
water remaining. The remaining volume is the total volume of the system. The remaining volume
displayed drops with water consumption to reach zero. When this happens, if no other valve is
regenerating, the lead valve starts regeneration while sending out a regeneration lock out signal
to all other valves of the system. If another valve is regenerating, the valve will stay in service until
the other goes back in service. As soon as the lead valve finishes its regeneration cycle, the
second valve starts regenerating, then the third, etc. The regenerating valve keeps on sending a
regeneration lock out signal to all other valves of the system. A manual regeneration can only be
done on the lead valve and only if the others are not regenerating. Automatic regeneration may be
triggered by either volumetric mean or external dry contact.
Inlet
Outlet
Valve
Meter
Tank
Check valve
5.7.4

Duplex alternating immediate system (System 7)

This system works with 2 valves and a meter.
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.
Inlet
Outlet
Valve
Meter
Tank
Check valve
Ref. MKT-IM-002 / E - 12.11.2019 49 / 172