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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. General 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.
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.
i.
It is permissible to run vent pipe through a vertical
or horizontal chase provided minimum clearances to
combustible materials are maintained.
j.
The minimum clearance to combustible material is
six (6) inches, unless otherwise specified by the vent
system manufacturer.
k.
Horizontal vent pipe must slope no less than one (1)
inch in four (4) feet of run.
l.
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.
ii. Minimum three (3) feet above any forced air inlet
located within ten (10) feet of the vent termination.
iii. Minimum four (4) feet below, four (4) feet
horizontally or one (1) foot above any door, window or
gravity air inlet.
iv. Minimum four (4) feet horizontally from electric
meters, gas meters, regulators and relief valves. This
distance may be reduced if equipment is protected from
damage due to condensation or vapor by enclosure,
overhangs, etc.
v.
Minimum twelve (12) inches from corners of
building.
m. Use appropriately designed thimbles when passing
through combustible walls or roofs.
n.
Install fire-stops where vent passes through floors,
ceilings or framed walls. The fire-stop must close the
opening between the vent pipe and the structure.
o.
Enclose vent passing through occupied or unoccupied
spaces above the boiler with materials having a fire
resistance rating at least equal to the rating of the
11
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