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Bosch Geothermal Heat Pumps
Bosch Thermotechnology Corp.
Data subject to change
Applications Manual
10.3 Loop Field Identi cation
Because the loop eld will be buried and out of sight, it is
important to identify the location of the boreholes in case
header repairs are needed or excavation work needs to be
performed. Typical methods are shown (Figure 59).
Fig. 59 Vertical closed-loop ground heat exchanger
Courtesy of International Ground Source Heat Pump Association/Oklahoma
State University
A recommended practice is to utilize conductive tracer
wire (sometimes known as locator wire), or magnetic
tape, so that boreholes and buried piping can be located
in the event that construction is planned near a ground
heat exchanger loop eld, or if repairs to the loop eld
are necessary (Fig. 60). Tracer wire and magnetic tape
responds to electromagnetic locating equipment above
ground. The tracer or magnetic tape should be laid in
horizontal trenches and along the supply and return lines
between the header and structure. The wire or tape should
be laid in a continuous loop and be buried at least 24
inches deep. The ends of tracer wire must be accessible
at the surface in a test port or terminated above nal
grade at the structure foundation with a permanent label
indicating the nature of the wires. Tracer wire access
locations need to be clearly identi ed.
If possible, plastic tags or labels reading "Geothermal
Lines Buried Below" or plastic “Caution” tape should be
placed in the back ll approximately twelve inches below
the nal surface elevation.
Fig. 60 Conductive tracer wire
