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III. Installation
A. VENTING
WARNING
Improper venting may result in property damage
and the release of flue gasses which contain
deadly carbon monoxide (CO) into the building,
which can cause severe personal injury and/or
death.
1. Venting Requirements
In order to properly vent this boiler, the installer
must select and install a vent system that meets all
requirements specified in this section (VENTING) as
well as following the instructions provided by the vent
system manufacturer.
a.
The vent system shall be designed and constructed in
accordance with the National Fuel Gas Code/NFPA
54 ANSI Z223.1 and applicable local building codes to
develop a positive flow adequate to convey flue or vent
gasses to the outdoors.
b.
If this boiler is being installed in Massachusetts, follow
the Massachusetts Code instructions printed later in this
section.
c.
Consult the vent pipe manufacturer's instructions for
vent system assembly and system specific installation
requirements.
WARNING
Vent pipe system must be made of materials
approved for use with condensing flue gasses.
d. Vent pipe system shall be acceptable for use with boiler
fuel type.
e.
Vent pipe system shall be compatible either by directly
connecting, or by use of an adapter, to the boiler vent
connection.
i.
This boiler is shipped with an AL 29-4C® Heat-Fab
Saf-T-Vent connection.
ii. Alteration of the boiler vent connection is
prohibited.
f.
Do not reduce the diameter of the vent pipe. The vent
pipe must not be smaller than the vent connector on the
boiler.
g.
Vent pipe system must be adequately supported at
intervals no less than five (5) feet apart. The completed
vent system must be rigid and able to withstand impacts
without collapse.
h. This boiler's venting is Category IV (positive vent
pressure, flue condensing), with regards to National Fuel
Gas Code/NFPA 54 ANSI Z223.1.
i.
Vent pipe system must be fully sealed.
j.
Atmospheric venting is prohibited.
k.
For multiple boiler installations, each boiler must have
its own independent vent system. Common venting
with additional or any other appliances is prohibited.
Do not use vent dampers or barometric dampers
with this boiler.
Direct vent applications: For direct vent (ducted
l.
combustion air) installations, the maximum vent length
is 50 equivalent feet. The vent length is equal to the total
length of straight pipe plus the equivalent length of vent
fittings.
m. Non-direct vent applications: For non-direct vent
installations (those without ducted combustion air),
design the vent system so that the pressure measured at
the outlet of the boiler is between 0"w.c. and 0.3"w.c. at
high fire.
n. If any point of the vent pipe system is higher than the
boiler flue collar, the vent system must have adequate
condensate drain loop(s) to prevent condensate from
running back into the boiler.
o.
It is permissible to run vent pipe through a vertical
or horizontal chase provided minimum clearances to
combustible materials are maintained.
p.
The minimum clearance to combustible material
is six (6) inches, unless otherwise specified by vent
manufacturer.
q.
Horizontal vent pipe must slope no less than one (1)
inch in four (4) feet of run. For sidewall venting, slope
pipe toward vent termination if possible.
r.
The vent termination location is restricted as follows:
i.
Minimum twelve (12) inches above grade plus
normally expected snow accumulation or seven (7)
feet above grade if located adjacent to public walkways.
DO NOT INSTALL over public walkway where local
experience indicates condensation or vapor from the
boiler creates a nuisance or hazard.
10
WARNING
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