Elmo Rietschle L-BV7 User Manual

Page 30

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Commissioning

8.2 Self-priming

operation

See Fig. 8, Pg. 30.

Here the following must be watched:

 The pump-motor unit must be pre-throttled

on the inlet side. This means a vacuum of
at least 900 mbar abs. [13.1 psia] must be
present in the inlet pipe (Item B) at switch-
on.

 During switch-on, the liquid level in the feed

pipe (Item A) and in the reservoir (Item C)
respectively must be at the same level as
the center of the unit shaft (Item 1).

 During operation the liquid level in the

reservoir (Item C) may not drop below
approx. 1 m [3.28 ft] below the center of
the unit shaft (Item 1).

Starting the pump-motor unit:

 Switch on the unit.

 The operating liquid is sucked in.

900 mbar abs

13.1 psia

 1 m
3.28 ft



Fig. 8: Self-priming operation

A Feed pipe for operating liquid
B Inlet

pipe

C Reservoir for operating liquid

1 Required liquid level when switching on
2 Min. liquid level during operation