Pentair Flotec EVOTRONIC 350 Manuel D'utilisation page 24

EN
USE AND MAINTENANCE MANUAL
Pipelines and valves must be correctly sized according to the installation.
Pipelines must not cause excessive mechanical stress on pump suction or delivery with excessive loads and torque
values.
If flexible hoses are used, fit a semi-rigid pipe on suction to avoid the risk of shrinkage due to negative pressure on
suction.
It is recommended to fit a filter on the inlet of the suction pipeline where the pump is used for pumping water from a
well or tank used for the recovery of rain water.
DANGER
Periodically check the condition of the filter and regularly clean or replace this element.
The pump is installed with positive suction head when it is located below the liquid in suction. Figure 1
Shutoff valve
1.
The pump is installed with negative suction head when it is located above the liquid to be received. Figure 2 (or
Figure 3 only for self-priming pumps)
Shutoff valve
1.
Optional check valve or control
2.
device with internal check valve
on delivery line
Correct pump installation is essential to ensure priming.
• Position the pump in the vicinity
of the well or tank to ensure that
the suction pipe is as short as
possible. In this way, the priming
time is reduced, above all in
the case of large differences in
height between the liquid and
suction point.
• Use a pipeline that is at least
the same diameter as that of
the pump suction port. If the
difference between the liquid
In the case of self-priming pumps ensure that the minimum height H3 (between the center of the suction port
and the check valve or between the center of the suction port and first point of use) in the table1 are observed to
guarantee suction height H2 (Figure 3).
22
Check valve
2.
Filler cap
3.
Foot valve
4.
and suction point is more than
4 meters, use a pipeline with a
larger section;
• To avoid the formation of air
vortexes, immerse the suction
pipe by at least 0.5m in the liquid
to be pumped (Figure 2, Figure 3
H1>=0.5m);
Filler cap
3.
Check valve on suction pipeline
5.
(Figure 3 only for self-priming
pumps)
• Install a foot valve with filter
at the end of the suction pipe (
Figure 2) or check valve on the
suction port in the case of self-
priming pumps (Figure 3)
• Ensure complete sealing of the
suction pipe;
• Use wide bends on the suction
section;