Operating Instruction
10
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Notice:
To protect the pump against air inlet from the suction side or working below an allowed
incoming pressure level, it is necessary to connect an external protection unit to the release
contact terminals of the unit. The Hydrovar-
Watercooled
shuts off when the contact will be
opened and turns on if the contact will be closed.
When there is an application of sucking out water from a well or a tank there has to be used
a level probe or a float switch as the low water protection.
For booster stations a pressure switch has to be mounted for low water protection. When
the pressure switch opens the contact of the Hydrovar-
Watercooled
will detect low water
and the pump will be stopped.
For protection against contamination inside the cooling pipe of the Hydrovar-
Watercooled
(e.g. at pumping of service or rain water) we recommend a filter before the unit.
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