Priming the pump – Priming a pump means complete-
ly filling its intake and suction line with water. This must be
done if the pump is mounted higher than the water source.
A removable plug or a valve must be installed at the highest
point in the suction plumbing. Prime the pump and intake
line by pouring water into the opening until it is filled com-
pletely. Your foot valve prevents loss of prime by not allow-
ing water to flow back into the water source. The pump will
create sufficient vacuum to self-prime to around 3 m/10 ft
(less at high elevations), but only when it is in new condition
and wet inside. A priming plug is always recommended if
the pump is installed above the water source. Using a good
quality ball valve instead of a plug is recommended, espe-
cially if frequent priming is expected.
Check valve at the pump outlet – A check valve at the
pump outlet is required if there is more than a 10 m/30 ft lift
above the pump, or in any pressurizing system. This allows
a more easy start of the pump. It also prevents back flow
when changing filter cartridges.
Pipe unions – If you run rigid piping (copper or PVC) di-
rectly to the pump, unions are required. Unions make pump
replacement easy, without the need to cut and re-solder or
re-glue the pipe. “Copper Flex Connectors” commonly used
for water heaters may be used instead.
8.5.6 Freeze Protection
CAUTION – The pump must be protected
from freezing. Freezing may damage the
pump.
CAUTION – When insulating the pump for
freeze protection the motor must be
excluded to prevent overheating.
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