Grundfos SP Instrucciones De Instalación Y Funcionamiento página 21

Problem Possible cause/how to check
2. Pump runs a)
but does not
deliver water.
b)
c)
d)
3. Pump runs a)
but at reduced
capacity.
b)
c)
d)
e)
Groundwater level in well is too
low or well is collapsed.
How to check:
Check well drawdown.
Water level should be at least
3 feet above suction
interconnector during operation.
Integral pump check valve is
blocked.
How to check:
Check the pump's performance
against its curve; see
section 9.2 Checking pump
performance on page 19.
Inlet strainer is clogged.
How to check:
Check the pump's performance
against its curve; see
section 9.2 Checking pump
performance on page 19.
Pump is damaged.
How to check:
Check the pump's performance
against its curve; see
section 9.2 Checking pump
performance on page 19.
Wrong direction of rotation
(three phase only).
How to check:
Check for proper electrical
connection in control panel.
Drawdown is larger than
anticipated.
Check drawdown during pump
operation.
Discharge piping or valve leaking.
How to check:
Examine system for leaks.
Pump inlet strainer or check valve
are clogged.
How to check:
Check the pump's performance
against its curve; see
section 9.2 Checking pump
performance
on page 19.
Pump is worn.
How to check:
Check the pump's performance
against its curve; see
section 9.2 Checking pump
performance on page 19.
Possible remedy
If water level is not at least 3 feet
above suction interconnector during
operation, then lower the pump if
possible, or throttle discharge valve
and install water level control.
If the pump is not operating close to
the pump curve, pull pump from the
well and inspect discharge section.
Remove blockage, repair valve and
valve seat if necessary. Check for
other damage. Rinse out pump and re-
install.
If pump is not operating close to the
pump curve, pull pump from the well
and inspect. Clean inlet strainer,
inspect integral check valve for
blockage, rinse out pump and
re-install.
If pump is damaged, repair as
necessary. Rinse out pump and
re-install.
Correct wiring and change leads as
required.
Lower the pump if possible. If not,
throttle discharge valve and install
water level control.
Repair leaks.
If not close to the pump curve, pull
pump from the well and inspect.
Clean strainer, inspect integral check
valve for blockage, rinse out pump
and re-install.
If not close to pump curve, pull pump
from the well and inspect.
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