28
441 01 2121 01
BURN HAZARD
Failure to follow this caution may result in personal
injury.
Hot vent pipe is within reach of small children when
installed in downflow position.
See the following instruction.
CAUTION
!
Table 9 – Minimum Allowable Input Rating of
Space−Heating Appliance in Thousands of Btuh per Hour
VENT HEIGHT
FT. (M)
INTERNAL AREA OF CHIMNEY
SQ. IN. (SQ. MM)
12
(7741)
19
(12258)
28
18064)
38
(24516)
Local 99% Winter Design Temperature: 17 to 26 degrees F
6 0 55 99 141
8 52 74 111 154
10 NR 90 125 169
15 NR NR 167 212
20 NR NR 212 258
30 NR NR NR 362
Local 99% Winter Design Temperature: 5 to 16 degrees F*
6 NR 78 121 166
8 NR 94 135 182
10 NR 111 149 198
15 NR NR 193 247
20 NR NR NR 293
30 NR NR NR 377
Local 99% Winter Design Temperature: −10 to 4 degrees F*
6 NR NR 145 196
8 NR NR 159 213
10 NR NR 175 231
15 NR NR NR 283
20 NR NR NR 333
30 NR NR NR NR
Local 99% Winter Design Temperature: −11 degrees F or
lower
Not recommended for any vent configuration.
*The 99.6% heating (db) temperatures found in the 1997 or 2001
ASHRAE Fundamentals Handbook, Climatic Design Information chapter, Table
1A (United States) and 2A (Canada) or the 2005 ASHRAE Fundamentals
handbook, Climatic Design Information chapter, and the CD−ROM included
with the 2005 ASHRAE Fundamentals Handbook.
Air for combustion must not be contaminated by halogen
compounds which include chlorides, fluorides, bromides, and
iodides. These compounds are found in many common home
products such as detergent, paint, glue, aerosol spray,
bleach, cleaning solvent, salt, and air freshener, and can
cause corrosion of furnaces and vents. Avoid using such
products in the combustion−air supply. Furnace use during
construction of the building could cause the furnace to be
exposed to halogen compounds, causing premature failure of
the furnace or venting system due to corrosion.
Vent dampers on any appliance connected to the common
vent can cause condensation and corrosion in the venting
system. Do not use vent dampers on appliances common
vented with this furnace.
Additional Venting Requirements
A 4−in. (102 mm) round vent elbow is supplied with the
furnace. A 5−in. (127 mm) or 6− in. (152 mm) vent connector
may be required for some model furnaces. A field−supplied
4−in. (102 mm) to 5−in. (127 mm) or 4−in. (102 mm) to 6−in.
(152 mm) sheet metal increaser fitting is required when 5−in.
(127 mm) or 6−in. (152 mm) vent connector is used. See
Figure 35 − Figure 47, Venting Orientation for approved vent
configurations.
NOTE: Vent connector length for connector sizing starts at
furnace vent elbow. The 4−in. (102 mm) vent elbow is
shipped for upflow configuration and may be rotated for other
positions. Remove the three screws that secure vent elbow to
furnace, rotate furnace vent elbow to position desired,
reinstall screws. The factory−supplied vent elbow does NOT
count as part of the number of vent connector elbows.
The vent connector can exit the furnace through one of five
locations on the casing.
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use
care and wear appropriate protective clothing, safety
glasses and gloves when handling parts, and servicing
furnaces.
CAUTION
!
1. Attach the single wall vent connector to the furnace
vent elbow, and fasten the vent connector to the vent
elbow with at least two field−supplied, corrosion−resist-
ant, sheet metal screws located 180 apart.
NOTE: A flue extension is recommended to extend from the
furnace elbow to outside the furnace casing. If flue extension
is used, fasten the flue extension to the vent elbow with at
least two field−supplied, corrosion−resistant, sheet metal
screws located 180 apart. Fasten the vent connector to the
flue extension with at least two field−supplied, corrosion
resistant sheet metal screws located 180 apart.
2. Vent the furnace with the appropriate connector as
shown in Figure 35 − Figure 47.
3. Determine the correct location of the knockout to be re-
moved.
4. Use a hammer and screwdriver to strike a sharp blow
between the tie points and work the slug back and forth
until the slug breaks free.
An accessory Vent Guard Kit is REQUIRED for downflow
applications for use where the vent exits through the lower
portion of the furnace casing door. Refer to the Vent Guard Kit
Instructions for complete details.
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