Chapter 5: Installation
* Routing the air exhaust in vacuum wells:
When QED controllerless pumps are used in wells that are under vacuum, and the exhaust air is
routed into the well, the well level will be maintained at this normal actuation point. If, however, the
well is under vacuum and the exhaust air is routed outside of the well (to atmospheric pressure),
the actuation point of the pump will be higher than the normal actuation point by a distance equal
to the amount of vacuum applied to the well (expressed in "inches of water column"). Please note
that the pump will still function normally and maintain the liquid level, albeit a higher level.
QED controllerless pumps automatically control the liquid level in the well. Under normal conditions,
the liquid level will be maintained at a point approximately one foot below the top of a bottom load
pump (this is the pump's actuation point). The pump will automatically start and stop as needed to
maintain the level at this actuation point.
Note: If the well environment is such that deposition occurs on stainless steel parts, the operator
may wish to raise the pump above the water level during a shutdown of the system.
11. Increase the air pressure to the pump until the pump is pushing the fluid out at the desired rate. With
sufficient air pressure (at least 10 to 15 psi higher than the vertical static head), the pump will gradually
draw down the fluid level in the well to the level of the pump. The time required for this draw down varies
with the yield of the well as compared to the flow rate of the pump. The maximum recommended pump
operating pressure is 120 psi.
10
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