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Section 1 - Furnace Installation
HYDRONIC INSTALLATIONS
NOTE: It is recommended that the circulation
pump in all hydronic systems be located in the
hot supply line, not in the return line (see Fig. 28
and 29).
Evaluate the existing hot water heating system before
starting the installation. If the existing hot water heating
system has been unable to maintain the temperatures
in the home at any time during cold weather before
installing the outdoor furnace, then the hot water heating
system is not adequate. More baseboard or other type of
heat exchanger must be added.
If a water-to-water heat exchanger is to be used with
an existing heating system, the existing heating system
must be able to adequately heat the building with a water
temperature of approximately 165°F. Some existing
nned tube baseboard hot water heating systems are
designed to operate with water temperatures up to
220°F or higher.
If the existing heating system is marginal or designed
to operate with water temperatures above 165°F, there
are alternative installation procedures that will make
the existing system work very well with the outdoor
furnace. These include:
1. Add more nned tube water baseboard heaters or
panel radiators.
2. A water-to-air heat exchanger with a thermostatic-
ally controlled fan can be installed in the lower part
of the building being heated (Fig. 28). This can
increase the amount of heat added to the building,
helping to maintain a constant temperature. This
heat exchanger can be added in the return line of the
system after the water-to-water heat exchanger.
3. An additional radiant heating circuit can be added to
heat areas that require additional heat.
Fig. 28
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