Hardy C3, Installation And Operating Instructions Manual, Page: 25 / 66

HARDY MANUFACTURING CO., INC (MODEL C3 & C5) PAGE 11
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” watertight pipe or other
insulation means. All plumbing and electrical lines should be run inside the 4”
watertight pipe or other insulation means for a standard installation. If more than one
zone is to be heated or more than one 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”
watertight pipe will be the four water lines, thermostat wire, and electrical supply wire.
The listing below describes each line and their function.
1.
One cold water supply line (if heater has auto fill option).
2. One hot water return line to water heater (if heater has internal domestic water
heat exchanger).
3. One water supply line to heating system.
4. 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.)
5. One 3 conductor thermostat wire.
6. One #12/2 W/G UF underground romex wire.