23
Rev. 0
COMBUSTION AND VENTILATION AIR
(DIRECT/NON-DIRECT VENT MODELS)
•
Less than 36 inches from any building opening or
any gas service regulator. For gas service regulators
in the Province of Ontario, 72 inches.
•
Less than 72 inches from the combustion air intake
of another appliance.
•
Directly above a gas utility meter or service regula-
tor.
•
Over a walkway unless located 84 inches above
grade.
Standard Furnace Connections
It is the responsibility of the installer to ensure that the pip-
ing connections to the furnace are secure, airtight, and ad-
equately supported.
As shipped, attachment “couplings” for vent/flue and com-
bustion air intake pipe connections are provided on the
furnace’s top cover (upflow) or basepan (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 us-
ing the rubber coupling and worm gear hose clamps pro-
vided with this furnace (See “Standard Connections” fig-
ure). The rubber coupling allows separation of the vent/flue
pipe from the furnace during servicing.
Note: Do not use other commercially available “no hub con-
nectors” 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 Join-
ing Methods section).
Note: For
non-direct vent installations, a minimum of one
90° elbow must 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 di-
rectly to the air intake coupling. On
counterflow units se-
cure the combustion air intake pipe to the air intake cou-
pling using the rubber coupling and worm gear hose clamps
provided with the unit. The counterflow rubber coupling al-
lows service removal of air intake piping internal to the fur-
nace blower compartment. Note: Because of probable ma-
terial 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.
Non-Direct Vent Installations
A minimum of one 90° elbow must be installed on the com-
bustion air intake “coupling” to guard against inadvertent
blockage.
R U BBER
C O U PLIN G
W IT H W O R M
G E AR C LA M PS
R U BBER
C O U PLIN G S
W IT H W O R M
G E AR C LA M PS
CU MB USTIO N
AIR PIPE
(D IR EC T VEN T ON LY)
CU MB USTIO N
AIR PIPE
(D IR EC T VEN T ON LY)
VEN T/FLUE
PIPE
VEN T/FLUE
PIPE
PV C
C O U PLIN G
(D IRE CT VEN T
90 PV C
ELB O W
(N O N -D IR E CT VEN T )
90 PV C
ELB O W
(N O N -D IR E CT VEN T )
O R
O R
U PFLO W CO U N TER FLO W
Standard Connections
Alternate Furnace Connections
If the standard locations are undesirable for a specific in-
stallation, 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 installa-
tions desiring vent/flue (and combustion air intake) piping
run vertically from the side of the cabinet.
Note: Standard and alternate locations can be combined
(i.e., an installation may use the standard combustion air
intake location but use the alternate vent/flue location or
vice versa), if needed.
CAUTION
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 alter-
nate vent/flue location refer to the following steps, the “Vent/
Flue Pipe Cuts” figure, and the “Alternate Vent/Flue Loca-
tion” figure.
Note: Counterflow instructions follow the upflow instruc-
tions.
1. Remove and save the four screws securing the vent/
flue coupling to the furnace top panel.
Counterflow units.
Remove and save the four screws securing the vent/
flue coupling to the furnace basepan. Also remove the
three screws securing the furnace’s internal vent/flue
piping to the blower deck.
