Grundfos SQF, Инструкция по установке и эксплуатации

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9. Fault finding the product
DANGER
Electric shock
Death or serious personal injury
‐
Switch off the power supply before you
start any work on the product.
‐
Make sure that the power supply can-
not be switched on accidentally.
Fault finding and fault correction must be carried out
by qualified persons.
Related information
4. Starting up the product
9.1 The pump does not run
Cause Remedy
The fuses in the electric
installation are blown.
Replace the blown fuses.
If the new ones blow too,
check that the electric in-
stallation was made cor-
rectly and that the sub-
mersible drop cable is
OK. If fuses keep blow-
ing, contact a local elec-
trician.
No power supply. Check the power source.
The motor protection
has stopped the mo-
tor due to overload.
Remove any blockage of
the pump or the motor
causing the over-
load. Ensure sufficient
power from the power
source.
The pump or the submer-
sible drop cable is defec-
tive.
Check that the electric in-
stallation was made cor-
rectly and that the sub-
mersible drop cable is
OK. Contact the lo-
cal service center to re-
pair or replace the pump
or the submersible drop
cable.
Overvoltage or undervolt-
age has occurred.
Restore correct power
supply. Check the speci-
fied voltage output from
the power source.
9.2 The pump runs but delivers no flow
Cause Remedy
Low power supply.
Ensure sufficient power
from the power source.
The outlet valve is
closed.
Open the outlet valve.
The non-return valve is
stuck in closed position.
Remove the pump from
the borehole and clean
or replace the non-return
valve.
The inlet strainer is clog-
ged.
Remove the pump from
the borehole and clean
the inlet strainer.
The pump is defective. The pump needs repair.
9.3 The pump runs at reduced performance
Cause Remedy
The drawdown is larger
than anticipated.
Lower the pump deeper
into the borehole, throttle
the pump or replace it
with a smaller model to
obtain a lower perform-
ance.
The outlet valve is partly
closed or blocked. Clean the outlet valve or
replace it, if necessary.
The outlet pipe is partly
clogged by impurities
(ochre).
Clean the outlet pipe or
replace it, if necessary.
The non-return valve is
partly blocked.
Remove the pump from
the borehole and clean
or replace the non-return
valve.
The pump and the riser
pipe are partly clogged
by impurities (ochre).
Remove the pump from
the borehole. Clean or
replace the riser pipe or
the pump, if necessary.
The pump is defective.
Have the pump re-
paired or replaced.
Leakage in the pipes.
Repair or replace
the pipes, if necessary.
Leakage in the riser pipe.
Repair or replace the ris-
er pipe.
Low power has occurred.
Ensure sufficient power
from the power source.
Check the specified volt-
age output from the pow-
er source.
17
English (GB)