63
Venting for Combustion Air
The boiler must be properly vented to ensure a
constant supply of clean intake air and to ensure
that exhaust air is properly removed from living
areas. When venting the boiler, follow these
guidelines:
●
Do not install the boiler in areas with
contaminated air (containing a high level of dust,
sawdust, sand, flour, aerosols, or any other such
airborne contaminants), as contaminants can
cause operational problems. The warranty does
not cover damage caused by contaminants in the
installation area. If you must install the boilers
in an area with contaminated air, use direct
venting to supply air from outside the building.
We recommend regular filter cleaning and
maintenance in these areas.
●
For best results, keep the venting system as short
and straight as possible.
●
Locate the boiler as close as possible to the vent
termination.
●
Do not connect the boiler vent to a vent for any
other gas boiler or vent stack.
●
For horizontal runs, slope the horizontal section
upward toward the vent termination at a rate of
1
/
4
in per foot (2 % slope).
●
Create an airtight seal at each joint in the exhaust
and intake air pipes from the boiler collar to the
vent termination (see below).
Note
Do not cover any non-metallic vent
materials with thermal insulation.
5.1 Venting the Boiler
DANGER
This appliance is certified as a “Category IV”
appliance and requires a special venting system.
The vent system will operate with a positive
pressure in the pipe. Exhaust gases must be piped
directly outdoors using the vent materials and
rules outlined in these instructions. Do not connect
vent connectors serving appliances vented by
natural draft into any portion of mechanical draft
systems operating under positive pressure. Follow
the venting instructions carefully. Failure to do so
will result in substantial property damage, severe
personal injury, or death.
WARNING
●
Improper venting of the boiler can result in
excessive levels of carbon monoxide, which can
lead to severe personal injury or death.
This
boiler must be vented in accordance with
the “Venting of Equipment
“
section of the
latest edition of the ANSI Z223.1/NFPA 54
Natural Fuel Gas Code in the USA and/or the
“Venting systems and air supply for boilers
“
section of the latest version of the CAN/CGA
B149.1 Natural Gas and Propane Installation
Code in Canada, as well as all applicable local
building codes and regulations.
Follow all
instructions and guidelines when venting the
boiler. Venting should be performed only by a
licensed professional.
●
The venting system must be sealed gastight to
prevent flue gas spillage and carbon monoxide
emissions, which will result in severe personal
injury or death.
●
The building owner is responsible for keeping
the exhaust and intake terminations free of
snow, ice, or other potential blockages, as well
as scheduling routing maintenance. Blocked
or obstructed vent piping terminations could
result in property damage, severe personal
injury, or death.
Summary of Contents for NFC-250/175H
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