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Standard Furnace Connections; Vent/Flue Pipe; Combustion Air Pipe-Direct Vent Installations; Combustion Air Pipe-Nondirect Vent Installations - Whirlpool WGFM195 Installation Instructions Manual

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Standard Furnace Connections

It is the responsibility of the installer to ensure that the piping
connections to the furnace are secure, airtight and adequately
supported.
As shipped, attachment "couplings" for vent/flue and combustion
air intake pipe connections are provided on the furnace's top
cover (upflow) or base pan (counterflow).
To use the standard connections, field-supplied vent/flue pipe
and combustion air intake pipe (when applicable) should be
secured directly to the furnace at these locations.

Vent/Flue Pipe

Vent/flue pipe can be secured to the vent/flue coupling using the
rubber coupling and worm gear hose clamps provided with this
furnace. See "Standard Connections" illustration. The rubber
coupling allows separation of the vent/flue pipe from the furnace
during servicing. Combustion air and vent piping should be
routed in a manner to avoid contact with refrigerant lines,
metering devices, condensate drain lines, etc. If necessary,
clearances may be increased by utilizing two 45º long-sweep
elbows and creating an "S" joint to provide additional space at
connection locations. This joint can be rotated on the fitting to
establish maximum clearance between refrigerant lines, metering
devices, condensate drain lines, etc. This joint is the equivalent of
one 90º elbow when considering elbow count.
Increased Clearance Configuration
A. Vent pipe
B. 45º long-sweep elbows
NOTES:
Do not use other commercially available "no hub connectors"
due to possible material conflicts.
The vent/flue pipe can also be secured using a PVC or ABS
elbow or coupling using the appropriate glue (see "Materials
and Joining Methods").
For nondirect vent installations, a minimum of one 90° elbow
should be installed on the combustion air intake coupling to
guard against inadvertent blockage.
Combustion Air Pipe—Direct Vent Installations
On upflow units, secure the combustion air intake pipe directly to
the air intake coupling. On counterflow units secure the
combustion air intake pipe to the air intake coupling using the
rubber coupling and worm gear hose clamps provided with the
unit. The counterflow rubber coupling allows service removal of
air intake piping internal to the furnace blower compartment.
NOTE: Because of probable material conflicts, do not use other
commercially available "no hub connectors." The combustion air
intake pipe can also be secured directly to the counterflow unit
air intake pipe coupling.
A
B
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)

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.
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
15

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