DAB KVC Serie Installationsanweisung Und Wartung Seite 19

The pump does not deliver.
The pump does not prime.
The pump supplies insufficient flow.
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 the state of the bearings.
− Check the motor rotation speed.
− Check priming.
− On three-phase motors, check that the
direction of rotation is correct.
− Difference in suction level too high.
− The diameter of the intake pipe is insufficient
or the horizontal stretch is too long.
− Foot valve or intake pipe blocked.
− The intake pipe or the foot valve is taking in
air.
− Check the slope of the suction pipe.
− Foot valve or impeller blocked.
− The diameter of the intake pipe is insufficient. Replace the pipe with one with a larger
− Check that the direction of rotation is correct.
− Intake pressure too low.
− Intake pipe or pump partly 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.
17
Change any worn bearings.
Invert the connection of two supply wires.
Replace the intake pipe with one with a larger
diameter.
Clean the foot valve and the intake pipe.
Check the suction pipe, repeat the priming
operations.
Correct the inclination of the intake pipe.
Remove clog. Replace the impeller if weared
down.
diameter.
Invert the connection of two supply wires.
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.