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COMBUSTION AIR & VENTING
REQUIREMENTS
WARNING:
Installation methods other than those described
in the following sections must comply with the
National Fuel Gas Code and all applicable local
codes for providing sufficient combustion air
to the unit.
• Provisions must be made during the installation of
this unit that provide an adequate supply of air for
combustion.
• Instructions for determining the adequacy of an
installation can be found in the current revision of the
NFGC (ANSI Z223.1 / NFPA54). Consult local codes
for special requirements. These requirements are for
US installations as found in the NFGC.
• The requirements in Canada (B149.1) are structured
differently. Consult with B149.1 and local code officials
for Canadian installations.
WARNING:
Combustible air must not be drawn from a
contaminated atmosphere. Excessive exposure
to contaminated combustion air will result in
safety and performance related problems.
To maximize heat exchanger life, the combustion air
must be free of chemicals which form corrosive acidic
compounds in the combustion gases.
IMPORTANT NOTE:
Do not store any chemicals with flammable or caustic
vapors near the vent termination. Some examples of
these chemicals are:
•
C
arbon tetraChloride
•
C
,
,
ements
Glues
paint removers
,
.
varnishes
etC
•
C
leaninG solvents
•
C
hlorine based swimminG pool
ChemiCals
•
C
&
hlorinated waxes
Cleaners
•
d
-
e
iCinG salts or ChemiCals
Vent Termination
This unit has been developed for use with a combination
heat exchanger condensate drain and venting system
designed to operate only with this type of system. A
Condensate Drain and Vent Kit (P/N 922323) is available
for purchase as an accessory item to attach to the 13.25"
x 2" PVC pipe within the control area of this unit. If the kit
is not being used, see Appendix (pages 36-39).
6
•
G
/K
asoline
erosene
,
•
h
aloGen type refriGerants
•
h
ydroChloriC aCid
•
m
asonry aCid washinG materials
•
p
ermanent wave solutions
•
w
ater softeninG ChemiCals
WARNING:
This unit is intended for outdoor installation
only. This unit must be vented to the outdoors.
No additional venting shall be used. Do not vent
the unit through a conventional venting system.
The vent and drain assembly must be installed to
assure proper operation of the unit. Figure 2 shows
the proper installation of the vent and drain assembly over
the vent outlet on the exterior of the corner panel. The
fasteners used to secure the vent and drain assembly have
been included in the kit. The following list summarizes
the requirements for the location of the vent system
termination:
• The location of the vent termination must be consistent
with the National Fuel Gas Code (ANSI Z223.1) or CAN/
CGA-B149 Installation Codes.
• The vent termination must be located at least 4 feet
horizontally from any electric meters, gas meters,
regulators, and relief equipment.
• The vent termination must be located at least 3 feet
above any forced air inlet located within 10 feet.
• The vent termination must be located at least 4 feet
below, 4 feet horizontally from, or 1 foot above any
door, window, or gravity air inlet into any building.
• The unit should be installed in a way that prevents any
obstruction of the vent termination during accumulating
snow.
• Verify exhaust gases will not impinge on windows
or building surfaces, which may be compromised or
damaged by condensation.
• Do not install the unit such that exhaust from the vent
termination is directed into window wells, stairwells,
under decks, or in alcoves or similarly recessed areas.
Figure 2. Heat Exchanger Condensate Drain
& Vent Assembly
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