Maritime Geothermal WH-Series, Installation And Service Manual

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1-Oct-2015 Page 15 002028MAN-01
off and the water valve closes. When snow comes it will usually
cover the entire process much like a small spring. It is recom-
mended that the pipe be below the frost line when possible for
maximum freeze protection.
When discharging into a river or stream, or above the surface
of a pond, the same guidelines should be followed as described
in the paragraph above for the percolation method.
When discharging the waste water below the surface of a
pond, the discharge pipe should be placed below the frost line
to prevent the pipe from freezing. As opposed to the percola-
tion method, water will remain in the end of the pipe. It is rec-
ommended that the surface of the pond be lower than the instal-
lation location of the heat pump where practical. This reduces
the back pressure generated by the weight of the water in the
pond.
A return well should be a minimum of 80 ft. from the supply
well for residential applications. The water returned to the well
will not necessarily be pumped into the same aquifer, depend-
ing on underground conditions. The return must be able to sup-
ply at least the same quantity of water as the amount you wish
to recharge into it. If the static level (level when not being
pumped) of a well is high (10 to 20 ft. from the surface) it may
be necessary to place a well cap on the well to keep the return
water from flowing out the top of the well. This cap is commonly
required since a certain amount of pressure is needed to force
the return water back down the well if the static level is high.
Water discharged by percolation will generally soak into the
ground within a distance of 50 to 100 ft. If suitable care is taken
to ensure that the drain pipe runs downhill and the end of the
pipe is protected by a bale of hay or spruce bows etc. the end of
the pipe will not freeze as the pipe will empty out when the heat
pump shuts