Pentair STA-RITE MULTI EVO Instructions De Service page 17

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. For drinking
water, all materials used upstream and downstream of the pump must also be suitable for contact with drinking water for human
consumption
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
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
• Optional check valve or control 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 and suction point is more than
4 meters, use a pipeline with a larger
section;
In the case of self­priming pumps ensure that the minimum height H3 (between the center of the suction port and the check valve) or
H4 (between the center of the suction port and first point of use) in the table1 are observed to guarantee suction height H2 (Figure 3).
• Check valve
• Filler cap
• Foot valve
• 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);
• 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
self­priming pumps (Figure 3)
INSTRUCTION MANUAL
• Filler cap
• Check valve on suction pipeline (Figure
3 only for self­priming pumps)
• Ensure complete sealing of the suction
pipe;
• Use wide bends on the suction section;
EN
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