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a specific inlet pressure (see data plate of
the expansion tank).
Before start-up and after changing the
settings of the pressure switch, it is re-
commended to check the gas pressure
again. Discharge the pressure of the ex-
pansion tank with membrane on the wa-
ter side and use a pressure measurement
device to read the gas pressure on the gas
filling valve of the tank with membrane.
the gas pressure value must corresponds
to approximately the pump intervention
pressure minus 10 %.
if the gas inlet pressure is too low, add air.
if the gas pressure value is too high, di-
scharge air via the valve.
Pump priming
the pump must only be started
up after it is filled with liquid.
if the pump has not been used
for a prolonged period, the filling
operation should be repeated
before starting up.
Pump installation below the liquid lev-
el (negative suction head) Figure 1
1. Close the shutoff valve downline of the
pump (delivery side).
2. Open the shutoff valve upline of the
pump (suction side).
3. loosen the filler cap to enable release
of the air, then fill the pump body and
suction line completely with liquid, un-
til it overflows from the hole.
4. tighten the filler cap fully down.
5. Start up the pump and slowly open the
shutoff valve downline (delivery side) to
ensure bleeding of any residual air in
the pump body and accumulated pres-
sure during start-up.
the pump must never be operat-
ed with the shutoff valve on the
delivery side closed. the dis-
charge valve must be opened as soon as
the pump has been started up, to prevent
damage to the latter by an excessive in-
crease in liquid temperature.
Installation of self-priming pumps
above the liquid level (positive suction
head) Figure 2,
Figure 3 and
tion" Tab1.
1. Ensure that the pipeline downline of
the pump is free (delivery side)
2. Open the shutoff valve downline of the
pump (delivery side).
3. Open the shutoff valve upline of the
pump (suction side).
tion Figure 2.
4. Open the valve near the pump to bleed
the air.
5. Remove the filler cap. if a filler cap is
fitted on the pipeline downline of the
pump (delivery side), remove the cap
and use the hole for filling. Otherwise
use the pump filling hole.
6. using
a funnel, fill the pump body and
suction pipe (Figure 2), or only the
pump body (Figure 3) completely with
liquid,
until it overflows from the hole.
7. Close the pump filler cap.
8. if the filler hose is on the pipeline, con-
tinue to fill the pipe and pump until
water overflows also from this second
hole.
9. insert the second filler cap.
10. Start up the pump and wait for the
liquid to be pumped. the pump can
run for 5 minutes to attempt to acti-
vate liquid suction. if the pump does
not generate pressure and flow rate,
repeat steps 1 to 10.
ENGLISH
"Installa-
refer to installa-
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