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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.
Adding Antifreeze to Outdoor Furnace
System
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 (10 days or
more). 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 furnace or boiler in the home or building.
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 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 inhibitors. MolyArmor
350 is compatible with (raw) propylene glycol. It
is important to use MolyArmor 350 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, reverse osmosis or deionized
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 and to kill bacteria, immediately heat the
system up to 185˚ F, 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 10˚F (-12˚C) or below.
NOTE: If using antifreeze, test the pH and Moly
levels once each month. If the bacterial issues
occur, the pH will decrease.
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, see Water Quality and
Maintenance in your Owner’s Manual.
MolyArmor 350
MolyArmor 350 Corrosion Inhibitor gives optimum
protection for the furnace water jacket and system
parts when it is used to initially treat the water and is
maintained at a minimum of 350 ppm of moly and pH
level between 8.0 and 9.5.
MolyArmor 350 is composed of common materials.
Molybdenum compounds are characterized as
nontoxic in US Public Health Bulletin 293, by the
Federal Hazardous Substances Labeling Act, and by
the Occupational Safety and Health Act. However, in
keeping with good safety and environmental practices,
dispose furnace water in accordance with federal, state
and local regulations.
• Unless regulation prohibits, you may drain the
outdoor furnace to a home 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.
