Manual 2100-537
I
Page 31 of 54
FIGURE 13
LAKE OR POND INSTALLATION
C. If possible, use a submersible pump suspended in the
dry well casing. Jet pumps and other types of suction
pumps normally consume more electrical energy than
similarly sized submersible pumps. Pipe the unit the
same as a water well system.
D. Size the pump to provide necessary GPM for the ground
water heat pump. A 12 GPM or greater water ow rate
is required on all models when used on this type system.
E. A pressure tank should be installed in dwelling to be
heated adjacent to the ground water heat pump. A
pressure switch should be installed at the tank for pump
control.
F. All plumbing should be carefully sized to compensate
for friction losses, etc., particularly if the pond or lake is
over 200 feet from the dwelling to be heated or cooled.
G. Keep all water lines below low water level and below
the frost line.
H. Most installers use 4-inch eld tile (rigid plastic or
corrugated) for water return to the lake or pond.
I. The drain line discharge should be located at least 100
feet from the dry well location.
J. The drain line should be installed with a slope of 2
inches per 10 feet of run to provide complete drainage
of the line when the ground water heat pump is not
operating. This gradient should also help prevent
freezing of the discharge where the pipe terminates
above the frost line.
K. Locate the discharge high enough above high water
level so the water will not back up and freeze inside the
drain pipe.
L. Where the local conditions prevent the use of a gravity
drainage system to a lake or pond, you can instead run
standard plastic piping out into the pond below the frost
and low water level.
For complete information on water well systems and lake
and pond applications, refer to Manual 2100-078 available
from your distributor.
WELL CAP
ELECTRICAL LINE
PITLESS ADAPTER
WATER
SUPPLY LINE
DROP
PIPE
GRAVEL FILL
WATER LEVEL
PERFORATED
PLASTIC CASING
SUBMERSIBLE
PUMP
12’
to
15’
LAKE
or
POND
TO PRESSURE
TANK
15’ to 20’
DEEP
WARNING
Thin ice may result in the vicinity of the
discharge line.
