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Combustion Air Pipe—Nondirect Vent Installations
A minimum of one 90° elbow should be installed on the
combustion air intake coupling to guard against inadvertent
blockage.
Standard Connection—Upflow
B
A
A. 90º PVC elbow (nondirect vent only)
B. Combustion air pipe (direct
vent only)
Standard Connection—Counterflow
B
A
A. 90º PVC elbow (nondirect
vent only)
B. Combustion air pipe (direct
vent only)
16
D
C
C. Rubber coupling with worm
gear hose clamps
D. Vent/flue pipe
D
C
C. Rubber couplings with worm
gear hose clamps
D. Vent/flue pipe
Alternate Furnace Connections
If the standard locations are undesirable for a specific installation,
alternate side panel locations are available for both combustion
air inlet and vent/flue pipe connections. These locations may be
of particular benefit to upright upflow installations requiring
additional access to an A coil, or to upright counterflow
installations requiring additional access to a filter or electronic air
cleaner, or to horizontal installations desiring vent/flue (and
combustion air intake) piping run vertically from the side of the
cabinet.
NOTE: Standard and alternate locations can be combined (for
example, an installation may use the standard combustion air
intake location but use the alternate vent/flue location or vice
versa), if needed.
WARNING
Goodman 56
Edges of sheet metal holes may be sharp. Use gloves as
a precaution when removing hole plugs.
Alternate Vent/Flue Location
The alternate vent/flue location is the large hole directly in line
with the induced draft blower outlet. To use the alternate vent/flue
location, refer to the following steps and the "Alternate Vent/Flue
Location" illustration.
NOTE: Counterflow instructions follow the upflow instructions.
Upflow Units
1. Remove and save the 4 screws securing the vent/flue
coupling to the furnace top panel.
Counterflow Units
Remove and save the 4 screws securing the vent/flue
coupling to the furnace base pan. Also remove the 3 screws
securing the furnace's internal vent/flue piping to the blower
deck.
Upflow and Counterflow Units
2. Loosen the worm gear hose clamps on the rubber elbow and
detach the rubber elbow from both the induced draft blower
and the vent/flue pipe.
3. Remove the vent/flue pipe from the furnace.
Upflow Units
4. Cut the vent/flue pipe 3³⁄₄" (9.5 cm) from the flanged end of
the pipe. See "Vent/Flue Pipe Cuts" illustration.
NOTE: The section of pipe attached to the coupling will reach
through the side panel to the induced draft blower.
5. Discard remaining pipe and elbows.
Counterflow Units
Cut the vent/flue pipe 3³⁄₄" (9.5 cm) from the blower deck
coupling. See "Vent/Flue Pipe Cuts" illustration
Save vent/flue pipe attached to the blower deck coupling for
use in the alternate location.
Discard remaining pipe and elbows.
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