Grundfos BMQE 15, Product Manual

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Handbook
Troubleshooting
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 Cause Remedy
1. The pump is running but
there is no pressure.
a) The pump and suction pipe
work need to be primed. Fill the pump and pipe with
water.
b) The suction pipe is not 100% tight.
Check all connections and the
suction pipe. Replace if
necessary.
2. The pump does not stop.
a) The pressure switch is set incor-
rectly. Check the setting
and adjust accordingly
3. The pump does not deliver
enough water.
a) Lack of water in the well. Drill new well.
b) Suction pipe is not 100% tight.
Check all connections and the
suction pipe. Replace if
necessary.
c) Pipe system is blocked. Clean pipework.
d) Pump capacity is not sufficient
Replace with a larger capacity
pump
4. Pump switches on and off
frequently.
a) Pre-pressure in pressure tank is too
low or too high. Adjust pre-pressure in pressure
tank. (0,9 x cut-in pressure)
b) Faulty footvalve.
Check footvalve,
replace if necessary.
c) The pressure switch differen-
tial between the start and stop
pressures is too small.
Increase the differential.
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.
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Handbook
Accessories
Fault Cause Remedy
5. The pump is running but
there is no pressure.
a) The pump and/or suction pipe
is incorrectly primed.
Prime the pump and/or suction
pipe with water.
b) The non-return valve or suction
pipe is leaky.
Replace the non-return valve
and/or seal the suction pipe.
6. The pump does not deliver
enough water.
a) The suction lift is too high.
Check the distance from the
pump to the water level in the
well. If possible, mount the
pump nearer the water level.
b) Pressure switch settings are incor-
rect
Adjust settings accordingly
7. The pump has run for a
long time, but delivers no
water when restarted after a
standstill.
a) The pump and/or suction pipe is
emptied of water.
Prime the pump and/or suction
pipe with water.
8. Pump switches on and off
frequently.
a) Pre pressure in pressure tank is
too low or too high.
Adjust pre-pressure in pressure
tank. (0,9 x cut-in pressure)
b) Faulty foot valve.
Check footvalve, replace if nec-
essary.
c) The pressure switch differential
between the start and stop pressures
is too small.
Increase the differential.
Pressure Tanks:
Keep the following tips in mind, when dealing with installations using pressure tanks:
• Stop the pump and open a valve to relieve the water pressure before checking the pre-charge pressure of
the tank.
• For traditional on/off controlled pumps, the pre-charge pressure should equal the cut-in pressure multiplied by 0.9.
Installation note:
You should always consult the Instruction and Operation manual for each specific pump during installation and start.
WebCAPS:
Find detailed information via the Grundfos website. WebCAPS is an easy to use on-line tool that enables users
to size systems and access general information about our products, where you can easily download the most
up-todate pump information.
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