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Section 1 - General Information
Options for Increasing Fuel Storage
An optional 48-Bushel Hopper is available (p/n 9660
or 9760) for increasing fuel storage. This hopper can
be positioned to the side of the furnace using a 5-1/2'
Auxiliary Auger Kit (p/n 9440).
A 6' Auxiliary Auger Kit (p/n 6453) and an 8' Auxiliary
Auger Kit (p/n 9454) are also available for other
applications. The auxiliary augers can also be used with
larger external bins.
An optional Auxiliary Auger Vibrator with Timer
Kit (p/n 9458) can be installed on the auxiliary auger
connected to an external hopper. Vibration occurs based
on a timer setting.
Potable Water
If the outdoor furnace is to heat potable water associated
with commercial food preparation or for heating milk-
house hot water, it is recommended to install a double-
wall heat exchanger. Also, when filling the system with
water, a backflow preventer must be installed in the line
used for filling.
Antifreeze
Most outdoor furnaces are installed without antifreeze
when an existing heating system is in place and there
is no anticipation of leaving the outdoor furnace
unattended for extended periods of time. If the building
being heated has an alternate heat source, system water
may be kept from freezing by running the circulating
pump(s) and drawing heat from the existing heat
emitter(s).
To prevent freezing if the outdoor furnace is not fired for
extended time periods or if lengthy power outages are
anticipated during cold weather, a nontoxic propylene
glycol boiler-type may be used in the system. Some
types of antifreeze that contain various inhibitors
have been known to create problems like coagulation
and jelling. To prevent potential problems, do not
use propylene glycol that is premixed with unknown
inhibitors. Central Boiler Corrosion Inhibitor Plus (p/n
1650) is compatible with straight propylene glycol. It is
important to use Corrosion Inhibitor Plus with straight
propylene glycol for corrosion protection.
If adding antifreeze to the system, it is imperative
that the entire system contain at least 30% antifreeze
concentration mixed with softened water to prevent
bacterial growth and minimize minerals in the system.
Bacterial growth is likely to occur with low antifreeze
concentrations and can cause corrosion in the furnace
water jacket and/or clogging of heat exchangers. To
confirm the antifreeze solution is adequate, allow the
pumps to circulate for at least 24 hours and then obtain
a sample of the system water. Using an antifreeze tester,
the solution must be protected to 0˚F (-18˚C) or below.
NOTE: Be sure to adhere to all warnings and
precautions on the antifreeze label.
NOTE: Do not use automotive or RV types of
antifreeze.
NOTE: If using antifreeze, use Test Kit (p/n 597)
when testing the treated water in the outdoor
furnace (see Water Quality and Maintenance).
Corrosion Inhibitor Plus™
To aid in protecting the system from corrosion, it is
imperative to add Central Boiler Corrosion Inhibitor
Plus™ (p/n 1650). When initially filling the system (see
Finalizing the Installation), add the Corrosion Inhibitor
Plus™ before adding water to the system. Any time
water is added to the system, Corrosion Inhibitor Plus™
must be added if a tested water sample indicates it is
necessary (see Water Quality and Maintenance).
Corrosion Inhibitor Plus™ is composed of common
materials and is biodegradable. However, in keeping
with good safety and environmental practices, the
supplier recommends the following if draining treated
system water becomes necessary:
• You may drain the outdoor furnace to a home septic
system. Central Boiler Corrosion Inhibitor Plus™
is biodegradable and can be properly treated in a
residential septic system. If doing so, however, be
careful not to overflow the septic system.
• Do not drain the outdoor furnace in such a manner
that the drain water could in any way contact
surface water, stream, river, estuary (where a river
meets a sea), lake, pond, ocean or other types of
waters.
• Do not drain to any location within 50 feet (15
meters) of any water well.
Shut-Off Valves
Shut-off valves must be installed on each hot supply
and return water line so each line can be shut off
individually for purging air from the system. Be sure all
valves and fittings are metal. Do not use plastic valves
or fittings.
