VENTING
GENERAL INFORMATION
The furnace must be vented in
accordance with these instructions.
the
Venting Tables in the "National
Fuel
Gas Code" (NFPA No. 54-1996,
ANSI Z223. 1-1996)
or any industry
accepted venting tables and any
requirements or codes of the local
utility or other authority having
jurisdiction.
A WARNING: DEVICES
ATTACHED TO THE FLUE OR
VENT FOR THE PURPOSE OF
REDUCING HEAT LOSS UP THE
CHIMNEY HAVE NOT BEEN
TESTED AND HAVE NOT BEEN
INCLUDED IN THE DESIGN CERTI-
FICATION OF THIS FURNACE. WE,
THE MANUFACTURER.CANNOT
AND WILL NOT BE RESPONSIBLE
FOR INJURY OR DAMAGE
CAUSED BY THE USE OF SUCH
UNTESTED AND/OR UNCERTIFIED
DEVICES, ACCESSORIES, OR
COMPONENTS.
A WARNING: NEVER VENT
STANDING PILOT MODELS
HORIZONTALLY. IMPROPER
INSTALLATION CAN CAUSE
PROPERTY DAMAGE, BODILY
INJURY OR DEATH FROM SMOKE,
FIRE OR CARBON MONOXIDE.
FIGURE 26
NATIONAL FUEL GAS CODE BOOK
INDUCED DRAFT BLOWER
IMPORTANT: ALWAYS PRE-DRILL
THE VENT PIPE ATTACHING
HOLES IN THE INDUCED DRAFT
BLOWER COLLAR TO PREVENT
CRACKING THE PLASTIC
MATERIAL. Drill 1/8"-diameter holes
through the vent pipe and collar. Use
#8 screws to attach. See Figure 27.
FURNACE CATEGORY
INFORMATION
This furnace is shipped as a
Category I type induced draft furnace.
A Category I furnace operates with a
non-positive vent pressure and has
a flue gas temperature at least 140°F
above the flue gas dew point.
Category I types use either a draft
hood or an induced draft blower. The
inducer pulls flue products through
the combustion chamber. The
buoyant effect of the hot flue gases
lifts them up the vent to the outdoors.
During the off cycle there is
very little
flow through the vent, cooling the
vent. During the on cycle there is no
dilution airflow, as with a draft-hood
type furnace. Even though the vent
heats rapidly after burner ignition, the
fact that there is no dilution air
causes a higher concentration of
FIGURE 27
water vapor in the flue gases. This
increases the risk of condensation
in the flue pipe or other venting
problems.
It is MOST IMPORTANT that you
follow the guidelines in these
instructions and the National Fuel
Gas Code venting tables to prevent
the possible formation of
condensation in the venting system.
As a Category I furnace it may be
vented vertically with type B-vent pipe
and also may be common vented
with other appliances described in
these instructions.
CATEGORY I VENT
NEGATIVE PRESSURE.
NON-CONDENSING
IMPORT ANT RETROFIT VENTING
INSTRUCTIONS
If this furnace is a replacement
installation. ALWAYS INSPECT the
existing vent system to be sure there
are no obstructions, blockages, or
signs of corrosion.
VENT PIPE MATERIAL
• Type B-vent, either rigid or
suitable flexible construction,
with a UL listing.
IMPORTANT: WHEN THE VENT
TABLE PERMITS MORE THAN ONE
DIAMETER OF PIPE FOR A
CONNECTOR OR VENT, THE
SMALLEST PERMITTED DIAMETER
MUST BE USED.
PRE-DRILLING FAN COLLAR
33
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