NOTE:
Moisture in combustion-air intake may be result of
improper termination. Ensure combustion-air intake pipe termina-
tion is similar to that shown in Fig. 37, 38, 39, 40, or 41 so it will
not be susceptible to areas where light snow or other sources of
moisture could be pulled in.
If use of this drain connection is desired, drill out fitting’s
tap plug with a 3/16-in. drill and connect a field-supplied
3/8-in. tube. This tube should be routed to open condensate
drain for furnace and A/C (if used), and should be trapped.
(See Fig. 36.)
2. Attach vent pipe 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 to 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 cap (factory-supplied in loose
parts bag) in unused combustion-air pipe casing hole.
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.
Fig. 35—Short Vent (5 to 8 Ft) System
A96230
HORIZONTAL TO ROOF
HORIZONTAL TO SIDEWALL
VERTICAL TO SIDEWALL
VERTICAL TO ROOF
VENT PIPE
COMBUSTION-AIR PIPE
COMBUSTION-AIR PIPE
VENT PIPE
COMBUSTION-AIR PIPE
VENT PIPE
COMBUSTION-AIR PIPE
VENT PIPE
12
″
MIN
12
″
MIN
12
″
MIN
12
″
MIN
NOTE: A 12 In. minimum offset pipe section is recommended with
short (5 to 8 ft) vent systems. This recommendation is to reduce
excessive condensate droplets from exiting the vent pipe.
—28—
Summary of Contents for CONDENSING GAS FURNACE 355MAV
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