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Prior to installation, locate and mark all existing
underground utilities, piping, etc. Install loops for new
construction before sidewalks, patios, driveways and
other construction has begun. During construction,
accurately mark all ground loop piping on the plot plan
as an aid in avoiding potential future damage to the
installation.
Loop Piping Installation
The typical closed loop ground source system is shown
in Figure 13. All earth loop piping materials should be
limited to only polyethylene fusion in inground sections
of the loop and galvanized or steel fittings should not be
used at any time due to their tendency to corrode by
galvanic action. All plastic to metal threaded fittings
should be avoided as well due to their potential to leak in
Figure 13. Typical Closed Loop Application
Unit Power
Disconnect
Concrete
block or
brick
Air Pad or Extruded
polystyrene insulation
board
CLOSED LOOP INSTALLATION
Thermostat
Wiring
earth coupled applications and a flanged fitting substituted.
P/T plugs should be used so that flow can be measured
using the pressure drop of the unit heat exchanger in lieu
of other flow measurement means. Earth loop temperatures
can range between 25-110 F and 2.25 to 3 gpm of flow
per ton of cooling capacity is recommended in any earth
loop applications.
Horizontal Applications
To install Horizontal earth couplings, dig trenches using
either a chain-type trenching machine or a backhoe. Dig
trenches approximately 8-10 feet apart. Trenches must be
at least 5 feet from existing utility lines, foundations and
property lines and at least 10 feet from privies and wells.
Trenches may be curved to avoid obstructions and may
be turned around corners.
Flow
Controller
Insulated
Hose Kit
P/T Plugs
17
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