DAB JET 75 Instructions Pour L'installation Et La Maintenance page 8

FAULT
3. The motor turns
with difficulty.
4. The pump does not
deliver.
5. The pump does not
prime.
6. The pump supplies
insufficient flow.
7. The pump vibrates
and operates noisily.
8. The motor does noy
stop when the
demand for water
has ceased.
9. The pressure
switch, starting and
stopping frequently
during normal
water delivery.
CHECKS (possible cause)
A. Check the voltage
insufficient.
B. Check whether any moving parts are
scraping against fixed parts.
A. The pump has not been primed correctly.
B. The diameter of the intake pipe is
insufficient.
C. Blocked foot valve.
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.
A. Check that the pump and the pipes are
firmly anchored.
B. There is cavitation in the pump, that is the
demand for water is higher than it is able to
pump.
C. The pump is running above its plate
characteristics.
A. Ensure that the value at which the
pressure switch is set to stop the motor is
not higher than the pressure than the
pump can generate (suction + delivery)
B. Check that the pressure switch contacts
move freely.
A. Check the setting of the pressure switch
which witt certainly be too low.
B. Check that the
expansion chamber (if used) is unbroken.
ENGLISH
which may be
B. Eliminate the cause of the scraping.
B. Replace the pipe with a larger diameter
C. Clean the foot valve.
A. Correct the problem and prime again.
B. Correct the inclination of the intake pipe.
A. Clean the foot valve.
B. Remove the obstructions or replace the
C. Replace the pipe with one with a larger
A. Fix the loose parts more carefully.
B. Reduce the intake height or check for load
C. It may be useful to limit the flow at
A. Set the pressure switch at a lower
B. Otherwise change the pressure switch.
A. Increase the setting values of the pressure
diaphragm of the B. Otherwise remove the fault.
6
REMEDY
one.
worn parts.
diameter.
losses.
delivery.
pressure.
switch until the problem is overcome. Do
not forget to reset
intervention pressure.
the minimun