Potable Water; Antifreeze; Corrosion Inhibitor Plus; Shut-Off Valves - Central Boiler Pallet Burner Dual Fuel Owner's Manual

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).
Section 1 - Furnace Installation

Corrosion Inhibitor Plus™

To aid in protecting the system from corrosion, it is
imperative to add Central Boiler Corrosion Inhibitor
Plus™ (p/n 1650). For recommended initial treatment
rates, refer to Water Quality and Maintenance.
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 septic
system. Central Boiler Corrosion Inhibitor Plus™
is biodegradable and can be properly treated in a
septic system. If doing so, however, be careful not
to overflow the tank.
• Do not drain the 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 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.

Ground Rod Kit

The outdoor furnace must be electrically bonded to
ground in accordance with the requirements of the
authority having jurisdiction or, in absence of such
requirements, with the National Electrical Code, ANSI/
NFPA 70 and/or the Canadian Electrical Code Part 1,
CSA C22.1 Electrical Code.
Install a Ground Rod Kit (p/n 6593) and connect it to
the outdoor furnace.
1. In the water line trench near the outdoor furnace,
drive the ground rod into the ground until the top of
the ground rod is below the ground surface.
2. Route the ground wire from the ground rod under
the outdoor furnace base and over to either a vertical
brace or the frame of the outdoor furnace.
NOTE: On some models, a 1/4" hole for the ground
terminal has been pre-drilled in the outdoor
furnace base. Check to see if there is an existing
1/4" hole before drilling the hole in Step 3.
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