Hydronic Installations - Central Boiler Pallet Burner Dual Fuel Owner's Manual

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.
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 building 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
finned tube baseboard hot water heating systems are
designed to operate with water temperatures up to
220°F or higher.
Fig. 24
Water-to-Water Shell & Tube Exchanger with Existing Boiler
This valve should be closed
if the outdoor furnace is not
being operated in the summer.
This pipe must not exceed a
height of 4 inches (10 cm)
above top of water heater.
NOTE
Water-to-water
Outdoor furnace water temp
setpoint should be set at Heat Exchanger
185˚F (85˚C) minimum.
NOTE
A pump must be installed in the hot
supply line between the outdoor furnace
and thermostatic valve.
Hot Supply from Pump
on Outdoor Furnace
22
M
R
C
H
Existing
Water
Heater
Return to Outdoor Furnace
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 finned 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. 24). 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.
Return
Section 1 - Furnace Installation
Circulating
Supply
Pump
Flow check or zone
valve here will prevent
thermal circulation and
overheating of
building. It is recom-
mended that the
circulation pump in all
hydronic systems be
located in the hot
supply line, not the
return line.
Existing
Boiler
NOTE
Installer must comply with
all applicable codes and
regulations.
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