DAB KV 3/12 Installationsanweisung Und Wartung Seite 34

FAULT
7. The pump does not
prime.
8. The pump supplies
insufficient flow.
9. The pump flow rate
is not constant.
10. The pump turns in
the opposite
direction when
switching off.
11. The pump vibrates
and operates
noisily.
CHECK
(possible cause)
A. The intake pipe or the foot valve is
taking in air.
B. The downward slope of the intake
pipe favours the formation of air
pockets.
A. Blocked foot valve.
B. The impeller is worn or blocked.
C. The diameter of the intake pipe is
insufficient.
D. Check that the direction of rotation is
correct.
A. Intake pressure too low.
B. Intake pipe or pump partly blocked
by impurities.
A. Leakage in the intake pipe.
B. Foot valve or check valve faulty or
blocked in partly open position.
A. Check that the pump and/or the pipes
are firmly anchored.
B. There is cavitation in the pump (see
point 7, paragraph
INSTALLATION)
C. The pump is running above its plate
characteristics.
D. The pump is not turning freely.
ENGLISH
A. Eliminate the phenomenon, checking
the intake pipe accurately, and prime
again.
B. Correct the inclination of the intake
pipe.
A. Clean the foot valve.
B. Change the impeller or remove the
obstruction.
C. Replace the pipe with one with a
larger diameter.
D. Invert the connection of two supply
wires.
B. Clean the intake pipe and the pump.
A. Eliminate the fault.
B. Repair or replace the faulty valve.
A. Fasten any loose parts.
B. Reduce the intake height or check for
on load losses.
C. Reduce the flow rate.
D. Check the state of wear of the
bearings.
28
REMEDY