Pentair FLECK 2750 NXT Installer Manual page 54

Installer manual Fleck 2750 NXT/NXT2 - Installation
Inlet
Valve
Tank
4th in
standby
(Primary
valve)
5.7.7.2 System operation in regeneration
The primary tank regenerates when its remaining volume becomes zero. The next tank with the
least remaining volume becomes the new primary tank. The tank with the next least volume
remaining will be the first to be activated when the flow rate reach the programmed trip point.
Tanks continue operating in this order.
Inlet
Valve
Tank
In regen
1st in
standby
If two tanks are in service and both becomes exhausted at the same time, the other two tanks will
shift from standby into service. The lead tank with exhausted capacity will start regeneration. The
second tank with exhausted capacity will enter into standby. If the flow increases and exceed the
trip point, a third tank must move into service position. The tank in standby with exhausted
capacity will shift into service to maintain a steady flow. Operating for extended periods in this
mode may degrade the water quality. Automatic regeneration may be triggered by either
volumetric immediate mean or external dry contact.
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3rd in 2nd in
standby standby
New 3rd in
primary standby
tank
Outlet
Check valve
1st in
standby
Meter
Outlet
Check valve
2nd in
standby
Meter
Ref. MKT-IM-026 / C - 15.12.2020