Whirlpool WFAU Installation Instructions Manual page 6

For installations on combustible flooring, a special base must
be ordered and used. See "Accessories."
1. Cut, size and frame opening in floor to fit the Combustible
floor base and provide a minimum 1" (2.5 cm) clearance
between the supply duct and combustible materials. The
4 legs on the base assembly should be recessed into the
floor, and the base should rest on all 4 outside flanges.
2. Construct duct connections with 1" to 1³⁄₄" (2.5 cm to 4.4 cm)
right angle flanges, and long enough to extend below the
floor joists.
3. Drop the duct connections through the top of the base
assembly with the right angle flanges in good contact with
the glass tape on top of the base assembly.
4. Position the furnace over the right angle duct flanges.
Combustible Floor Installation (Counterflow Models only)
A. Base assembly
B. Furnace
C. Outlet duct (drops into base
assembly)
6
B
B
A
E
C
1"
D
C
E
A
D. Combustible floor
E. Woven glass tape (between
flanges of outlet duct and
base assembly)
Horizontal Installations
WFAR, WFLR, WFAT and WFLT model furnaces can be
horizontally installed for airflow right to left or left to right. To
ensure access to parts for servicing, install upflow and
counterflow furnaces so that the burner and blower access
panels are readily accessible.
NOTE: When installed horizontally, the installer must install a
sheet metal screw to retain the upper door as shown following, in
either Position B or D, depending on installation configuration.
Horizontal Installation (WFAR and WFLR models)
A
A. Return
B. Screw placement for
Left to Right airflow
Horizontal Installation (WFAT and WFLT models)
A
A. Supply
B. Screw placement for
Right to Left airflow
Horizontal Installation—Suspended
WFAR, WFLR, WFAT and WFLT model furnaces may be installed
as suspended units in the horizontal position. These furnaces are
not designed for direct attachment of suspension rods to the
furnace casing.
The suspending means must be field fabricated, and should
consist of two "cradles" made by attaching 2 rods to a length
of angle iron or suitable gauge steel.
Locate the cradles so that they are as close as possible to the
ends of the furnace (this will provide access for removal of
major components such as the blower assembly).
Provide enough clearance between the suspension rods and
the furnace to allow removal of access panels.
B
D
C. Supply
D. Screw placement for
Right to Left airflow
B
C
D
C. Return
D. Screw placement for
Left to Right airflow
C