8.4.5 Initial Start-up
CAUTION – Never start the pump if it is
not filled with water and has not been
vented. The pump and suction pipe must
be fully filled with clean water otherwise
the pump will be damaged
8.4.5.1 Filling Pump with Water
The pump and the whole suction pipe must be fully filled
with clean water.
If the water source level is higher than the pump
inlet:
1. Close the gate valve in the outlet pipe and loosen the
air vent screw.
2. Open the gate valve in the suction pipe slowly.
3. Tighten the air vent screw when water streams out
continuously.
If the water source level is below the pump inlet:
Suction pipeline and pump must be filled with water
manually.
1. Close the gate valve in the outlet pipe and open the
gate valve in the suction pipeline.
2. Loosen the air vent screw and fill clean water into the
pump through the filler pipe.
3. Fasten the air vent screw after the pump and the
suction pipeline are completely filled with water.
CAUTION – Installing a suitable filler
pipe is highly recommended for proper
priming of the pump system. A pump
system which is not primed completely
will likely get damaged when it is
switched on.
CAUTION – A nonreturn valve must be
installed at the start of the inlet pipeline
otherwise it is impossible to prime the
pump successfully.
WARNING – Do not start the pump until
it has been filled completely with water.
WARNING – Make sure that the
installed shutoff valves in the suction and
pressure lines are completely open during
operation, the pump must never run with
shutoff valves closed!
Figure 15: Vent and drain holes
Air vent hole
Water drain hole
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