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103536-13 - 2/24
MegaSteam
Installation & Service Manual
D. STACK TEMPERATURE
1. The temperature of the flue gases has a significant
effect on the amount of draft created in a vertical
chimney as well as the propensity to create
condensate. The higher the stack temperature, the
greater the amount of draft that can be generated.
A lower stack temperature not only reduces the
amount of draft that can be created but it also
increases the possibility that the flue gases could
condense in the chimney connector or stack.
2. NFPA 31 and CSA B139 have information to
help the installer make an appropriate choice
of venting materials. In some cases a chimney
may have to be lined to create sufficient draft. In
other cases, the chimney may have to be lined
to prevent the corrosion of a masonry chimney.
Consult with a chimney specialist knowledgeable
on the requirements for chimney requirements in
your area.
CAUTION
Any doubt on the condition of a chimney
or it’s ability to prevent the generation and
accumulation of flue gas condensate, must be
relined according to NFPA 31 (United States) or
CSA B139 (Canada).
CAUTION
Use the chimney venting tables as a guide. It
is highly recommended that any borderline
application should result in the relining of
the chimney with a suitable liner that creates
sufficient draft and to protect against corrosion
caused by flue gas condensate.
3. Baffles – The efficiency of the boiler is based
on the insertion of flue baffles supplied with
your product. Under no circumstances are
other baffles to be used on this product. Refer
to Section 2, Item E for baffle installation. If
there is any doubt on the application of this
boiler on the intended chimney, consult with
your local code officials. At a minimum, remove
the baffles to increase the stack temperature.
In addition, the lower the CO
2
level the higher
the stack temperature.
E. MINIMUM CLEARANCES
See Figure 1-4 for details regarding clearances to
combustibles for the boiler.
F. OPTIONAL AIR INTAKE PIPING
INSTALLATION - All air for combustion can
be supplied directly to the burner from outdoors
providing that the criteria for chimney, vent
connector and minimum stack temperature
outlined in this section can be maintained. (ONLY
AVAILABLE WITH BECKETT BURNER)
.
Refer to
Section 1, Paragraph C, Steps 5 and 6 for optional
air intake piping installation information.
5
Venting & Air Intake Piping
(continued)
WARNING
Using outdoor air in the middle of winter may
result in lower stack temperatures and chimney
degradation. Any signs of condensate seepage
or discoloration at the base of chimney must be
remedied immediately per the details outlined in
this section.
• Do not reduce size of air intake pipe.
• Read, understand and follow combustion air
instruction restrictions contained in the Pre-
Installation Section of this manual.
WARNING
Remove the baffles if there are any signs
of condensation in the chimney or chimney
connector. Consult with your local chimney
professional for recommendations.
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