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Connect Venting
1. Using a ¹⁄₄ in. sheet metal screw, secure the vent pipe to the
inducer blower outlet.
2. Make sure all vent connections do not leak.
3. Check that the venting is open, and that it is the correct size.
4. Check that the vent pipe terminates outside the building.
Install Duct Work
IMPORTANT:
Install duct work in accordance with NFPA 90B and any local
codes.
If there is no complete return air duct system, the return air
connection must be sealed to the furnace casing and run full
size to a location outside the utility room or space housing
the furnace to prevent a negative pressure on the venting
system.
Installation with Return Ducts
A return air duct system is recommended. If the unit is installed in
a confined space or closet, a return connection must be run, full
size, to a location outside the closet. The air duct in the closet
must be tight to prevent any entrance of air from the closet into
the circulating air.
Installation with an Evaporator Coil
When a condensing unit is used in conjunction with the furnace,
the evaporator coil must be installed in the discharge (supply) air.
Do not install an evaporator coil in the return air; excessive
condensation will occur within the furnace.
When installing a WME coil in a horizontal position with a
horizontal gas furnace, always keep the open end of the A-coil
facing the supply air outlet of the furnace (blow into the open end
of the A-coil). The A-coil should point away from the supply air
outlet of the furnace as shown.
Supply
Installation without an Evaporator Coil
If a cooling coil is not installed with the furnace, then a removable
access panel should be provided in the supply plenum for
purposes of inspecting the heat exchanger. This opening must be
accessible when the furnace is installed. It must be large enough
that the heat exchanger can be viewed for possible openings
using light assistance or so that a probe can be inserted for
sampling the airstream. The cover for the opening must be leak
tight.
Filters are not supplied with these furnaces. It is the furnace
installer's responsibility to install properly sized filters in
accordance with the Minimum Filter Requirements chart.
The Airflow Descriptor is the 2 digits immediately preceding
the hyphen (-) in the furnace model number. Example: 16 is
the Airflow Descriptor for furnace model WFAT075B16-1A.
The model number is located on the rating plate inside the
access panel.
Areas and dimensions shown for cleanable filters are based
on filters rated at 600 ft per minute face velocity.
Typical filter sizes are shown; however, any combination of
filters whose area equals or exceeds the minimum area
shown is satisfactory.
Airflow
Descriptor
09
10
12
14
16
20, 22
If a central return air filter-grille is used, the furnace does not
require a filter.
To install a filter at the furnace only, use the following kits:
AFILT524 for side return on upflow installations.
AFILT529 for bottom return on upflow furnace installations.
WAFILTHA7 for single side return in installations requiring
Return
more than 1600 CFM nominal air delivery.
Filter Specifications
Minimum Filter Requirements Chart
Disposable Filters
Min. Area
Size
Qty. Min. Area
(sq. in.)
(in.)
480
20 x 25
1
480
20 x 25
1
576
16 x 20
2
672
20 x 20
2
768
20 x 20
2
960
20 x 25
2
Cleanable Filters
Size
Qty.
(sq. in.)
(in.)
240
16 x 20
1
240
16 x 20
1
288
16 x 20
1
336
20 x 20
1
384
20 x 20
1
480
20 x 25
1
11
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