Suction Lift - Grundfos BMQE 15 Product Manual

Handbook
Troubleshooting:

Suction Lift:

When installing above ground suction lift pumps, the following basic rules must be adhered to:
• Avoid frost.
• Pump only clean water.
• Install a filter if water contains impurities.
• A foot-valve must be installed.
• The suction pipe must be 100% air tight.
• The pump must be primed before starting for the first time.
Fault
1. The pump is running but
there is no pressure.
2. The pump does not stop.
3. The pump does not deliver
enough water.
4. Pump switches on and off
frequently.
Flooded Suction:
When installing above ground suction booster pumps, the
following basic rules must be adhered to:
• Inlet pressure.
• Avoid frost.
• Pump only clean water.
• Avoid dry-running
• A non-return valve must be installed.
• The suction pipe must be 100% air tight.
• The pump and piping must be primed before starting
for the first time.
8
Cause
a) The pump and suction pipe
work need to be primed.
b) The suction pipe is not 100% tight.
a) The pressure switch is set incor-
rectly.
a) Lack of water in the well.
b) Suction pipe is not 100% tight.
c) Pipe system is blocked.
d) Pump capacity is not sufficient
a) Pre-pressure in pressure tank is too
low or too high.
b) Faulty footvalve.
c) The pressure switch differen-
tial between the start and stop
pressures is too small.
Troubleshooting
Remedy
Fill the pump and pipe with
water.
Check all connections and the
suction pipe. Replace if
necessary.
Check the setting
and adjust accordingly
Drill new well.
Check all connections and the
suction pipe. Replace if
necessary.
Clean pipework.
Replace with a larger capacity
pump
Adjust pre-pressure in pressure
tank. (0,9 x cut-in pressure)
Check footvalve,
replace if necessary.
Increase the differential.