19
COMBUSTION AND VENTILATION AIR (cont .)
GENERAL INFORMATION
The furnace must be vented in accordance with these instruc-
tions, National Fuel Gas Code, ANSI Z223 .1 and requirements
or codes of the local utility or other authority having jurisdiction .
DRAFT INDUCER
FURNACE CATEGORY INFORMATION
This furnace is shipped as a Category
I
type induced draft fur-
nace . A Category
I
furnace operates with a nonpositive vent
pressure and has a vent gas temperature at least 140°F above
the dew point of the vent gases . A Category
I
type may be a
draft hood equipped furnace or have a fan assisted combustion
system (induced draft) . The inducer is used to pull flue products
through the combustion chamber and as they leave the furnace,
most of the energy has been dissipated . The buoyant effect of
the flue gases provides venting to the outdoors .
During the off cycle, the inducer is off and 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 . Although
the vent heats up rapidly without dilution air, the flue products
contain more water vapor, which results in a higher dew point
temperature . It is most important that you follow the guidelines
in these instructions to prevent the possible formation of con-
densation in the venting system .
As a Category
I
furnace it may be vented vertically with type
B-1 vent pipe and also may be common vented, as described in
these instructions .
IMPORTANT APPLICATION NOTES
When the furnace is used as a replacement, the existing vent
system should be inspected to assure that there are no obstruc-
tions, blockage, or any signs of corrosion and is properly sized
for use with this furnace .
NOTE: When the vent table permits more than one diameter
of pipe for a connector or vent, the smallest permitted diameter
must be used .
Vent pipe may be type “B-1,” either rigid or suitable flexible con-
struction that carries a U .L . listing .
Common venting is allowed with vertical B-1 vent systems, and
lined masonry chimneys . Follow the National Fuel Gas Code
ANSI Z223 .1 or proper installation practices .
NOTE: Follow combustion air instructions as outlined in this
manual .
Single wall vent connectors to “B-1 vent or masonry chimneys”
may be used under the guidelines of the National Fuel Gas
Code ANSI Z223 .1 .
The entire length of the vent connector shall be readily ac-
cessible for inspection, cleaning and replacement .
“B-1” VERTICAL VENTING
NOTE: Refer to the National Fuel Gas Code, ANSI Z223 .1 .
Type “B-1” vents must be installed in accordance with the terms
of their listings and the vent manufacturer’s instructions.
“B-1” vents must be supported and spaced in accordance with
their listings and the manufacturer’s instructions. All vents must
be supported to maintain their minimum clearances from com-
bustible material .
*NOTE: All furnaces have a 3” vent connection as shipped from the fac-
tory . A 3” to 4”, 3” to 5”, or 4” to 5” vent transition may be required when
vertically vented or common vented with metal vent pipes . THE VENT
TRANSITION CONNECTION MUST BE MADE AT THE FURNACE
VENT EXIT . It must originate with an adapter if required, at the furnace
flue collar and terminate either in a listed cap or roof assembly . When
common venting, the vent connector size may differ from the above
diameters depending on application . See National Fuel Gas Code ANSI
Z223 .1 or latest edition tables .
!
WARNING
DEVICES ATTACHED TO THE FLUE OR VENT FOR THE
PURPOSE OF REDUCING HEAT LOSS UP THE CHIM-
NEY HAVE NOT BEEN TESTED AND HAVE NOT BEEN
INCLUDED IN THE DESIGN CERTIFICATION 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 UN-
CERTIFIED DEVICES, ACCESSORIES OR COMPONENTS .
!
WARNING
VENT PIPE ATTACHING HOLES MUST BE PREDRILLED
IN THE DRAFT INDUCER COLLAR TO PREVENT DAM-
AGING THE INDUCER . DRILL 1/8” DIAMETER HOLES
THROUGH THE VENT PIPE AND COLLAR AND USE #8
SCREWS TO ATTACH . SEE FIGURE 16 . FAILURE TO FOL-
LOW THIS WARNING CAN CAUSE RECIRCULATION OF
FLUE PRODUCTS CAUSING CARBON MONOXIDE POI-
SONING RESULTING IN PERSONAL INJURY OR DEATH .
VENTING
VERTICAL VENTING
Categorized
Furnace Vent
Input
Size Recommended
(See NFGC)
50K
3
”
75K *4
”
100K
*4
”
125K
*5
”
150K
*5
”
Combustion Air
Summary of Contents for 801C Series
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