Installer Manual Fleck 3900 - NXT - Installation
48 / 126 Ref. MKT-IM-015 / B - 08.06.2018
2. The total flow rate to the primary tank increase past the first trip point programmed rate. The
flow rate demand stays past the trip point for the preset delayed time. The next tank (least
volume remaining) changes from standby to in service. This then splits the total flow between
two meters.
3. The flow rate demand decreased below the first trip point. The tank returns to standby.
Total flow split
between two meters
Valve
Tank
Inlet
Outlet
Stand-By
Meter
Check valve
Stand-ByServiceFirst trip
point
(primary
tank)
Flow rate demand
below first trip point
Valve
Tank
Inlet
Outlet
Stand-By
Meter
Check valve
Stand-ByStand-ByPrimary
tank
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