DAB KVC series Installations- Und Wartungsanleitungen Seite 24

Fault
The pump flow rate is not constant.
The pump turns in the opposite
direction when switching off.
The pump vibrates and operates
noisily.
ENGLISH
Check (possible cause)
− Intake pressure too low.
− Intake
pipe or
blocked by impurities.
− Leakage in the intake pipe.
− Foot valve or check valve faulty
or blocked in partly open position.
− Check that the pump and/or the
pipes are firmly anchored.
− There is cavitation in the pump.
− The pump is running above its
plate characteristics.
− The pump is not turning freely.
21
pump partly Remove clog.
Repair or replace the faulty valve.
Reduce the intake height or check
for load losses.
Reduce the flow rate.
Check the state of wear of the
bearings.
Remedy