HARDY MANUFACTURING CO., INC (MODEL H3, H5, & H6) PAGE 8
Section II
2-4
Location of Plumbing and Electrical Lines
The plumbing and electrical lines for your unit must be installed underground. The water
lines must be buried below the frost line to prevent freezing. The depth of the trench varies
to different regions of the country. Be completely sure about the correct depth before the
plumbing lines are installed underground.
A trench must be dug wide enough to accommodate a 4 inch watertight pipe or other
insulation means. All plumbing and electrical lines should be run inside the 4 inch water
tight pipe or other insulation means for a standard installation. If more than 1 zone is to be
heated or more than 1 location is to be heated then an additional pipe, or insulation must
be installed underground.
This pipe will run from the rear of the unit to the location to be heated. Inside the 4 inch
watertight pipe be the 2 water line, thermostat wire, and electrical supply wire. The listing
below describes each line and their function.
1. One water supply line to heating system
2. One water return line from heating system
(All of these must be at least 3/4” pipe and
may require 1” because of longer distances
or some hydronic applications.)
3. One 3 conductor thermostat wire
4. One #12/2 W/G UF underground Romex wire
If more than one location is to be heated, a second 4 inch or single 6” watertight pipe or
other insulation means will need to be installed underground for the water lines and
thermostat wires of the second location.
Summary of Contents for H3
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