2. Attach vent pipe to furnace as follows:
a. Determine location of vent pipe connection to inducer
housing as shown in Fig. 34 for application.
b. Reposition elastomeric (rubber) inducer housing outlet
cap and clamp to appropriate unused inducer housing
connection. Tighten clamp.
CAUTION: UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit compo-
nent damage.
Inducer housing outlet cap must be installed and fully
seated against inducer housing. Clamp must be tightened
to prevent any condensate leakage.
c. Install pipe support (factory-supplied in loose parts bag)
into selected furnace casing vent pipe hole. Pipe support
should be positioned at bottom of casing hole.
CAUTION: UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit compo-
nent damage.
Vent pipe must be installed and fully seated against
inducer housing internal stop. Clamp must be tightened to
prevent any condensate leakage.
NOTE: A 2-in. diameter pipe must be used within the furnace
casing. Make all pipe diameter transitions outside furnace casing.
d. Be certain that mating surfaces of inducer housing
connection, elastomeric coupling, and 2-in. diameter
vent pipe are clean and dry. Assemble the elastomeric
(rubber) vent coupling (with 2 loose clamps) onto
inducer housing connection. Insert the 2-in. diameter
vent pipe through the elastomeric (rubber) coupling and
fully into inducer housing connection until it bottoms on
the internal stop. Tighten both clamps to secure the pipe
to inducer housing. Tighten the clamp screws to 15
in.-lb. of torque.
e. Install casing hole filler plug (factory-supplied in loose
parts bag) in unused combustion-air pipe casing hole.
Vent Extension Pipe: Furnaces with 100,000 Btuh and larger
inputs are supplied with a PVC vent extension pipe (2-in. diameter
by 12-in. long). This pipe has a built-in channel to assist vent
condensate disposal. When this vent extension pipe is supplied, it
must be used to connect the field vent pipe to furnace inducer
housing on ALL upflow and downflow applications.
NOTE: See label on vent extension pipe for proper installation.
This pipe may be shortened if an elbow is used to connect vent
extension tube to field installed vent pipe.
3. Working from furnace to outside, cut pipe to required
length(s).
4. Deburr inside and outside of pipe.
5. Chamfer outside edge of pipe for better distribution of
primer and cement.
6. Clean and dry all surfaces to be joined.
TABLE 7—MAXIMUM ALLOWABLE PIPE LENGTH (FT)
ALTITUDE (FT) UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
123456
0 to 2000
036060
2 Pipe or 2-in
Concentric
1-1/2 20 15 10 5 NA NA
2 707070707070
036080
048080
2 Pipe or 2-in
Concentric
1-1/2 10 NA NA NA NA NA
2 555035303020
2-1/2 70 70 70 70 70 70
048100
060100
2 Pipe or 3-in
Concentric
2 5 NA NA NA NA NA
2-1/2 40 30 20 20 10 NA
3 707070707070
060120
2 Pipe or 3-in.
Concentric
2-1/2 one disk 10 NA NA NA NA NA
3† 45 40 35 30 25 20
3† no disk 70 70 70 70 70 70
ALTITUDE (FT) UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
123456
2001 to 3000
036060
2 Pipe or 2-in
Concentric
1–1/2 17 12 7 NA NA NA
2 706766616161
036080
048080
2 Pipe or 2-in
Concentric
2 494430252515
2-1/2 70 70 70 70 70 70
048100
060100
2 Pipe or 3-in
Concentric
2-1/2 35 26 16 16 6 NA
3 707070706661
060120
2 Pipe or 3-in.
Concentric
3 14 9 NA NA NA NA
3† no disk 70 70 63 56 50 43
4† no disk 70 70 70 70 70 70
ALTITUDE (FT) UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
123456
3001 to 4000
036060
2 Pipe or 2-in
Concentric
1-1/2 16 11 6 NA NA NA
2 686362575756
036080
048080
2 Pipe or 2-in
Concentric
2 464128232213
2-1/2 70 70 70 70 70 70
048100
060100
2 Pipe or 3-in
Concentric
2-1/2 33 24 15 14 5 NA
3 707070666156
060120
2 Pipe or 3-in.
Concentric
3† no disk 65 58 51 44 38 31
4† no disk 70 70 70 70 70 70
See notes at end of table.
—29—
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