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Downflow Installation
Downflow unit installs in three ways: on non-combustible
flooring, on combustible flooring using a downflow com-
bustible flooring base, or on a reverse-flow cooling cabi-
net. Do not drag the unit across the floor.
Installation on Non-Combustible Flooring (Figure 6)
1 - Cut floor opening keeping in mind clearances listed
on unit rating plate. Also keep in mind gas supply
connections, electrical supply, flue and air intake
connections and sufficient installation and servicing
clearances. See table 1 for correct floor opening
size.
2 - Flange warm air plenum and lower the plenum into
the opening.
3 - Set the unit over the plenum and seal the plenum to
the unit.
4 - Ensure that the seal is adequate.
OPENING
Figure 6
TABLE 1
NON-COMBUSTIBLE FLOOR OPENING SIZE
Front to Rear
Cabinet
Width
in
A (14.5")
B (17.5")
19-3/4
C (21")
NOTE - Floor opening dimensions listed are 1/4 inch (6
mm) larger than the unit opening. See unit dimensions on
page 2.
Installation on Combustible Flooring (Figure 7)
1 - When unit is installed on a combustible floor,
a downflow combustible flooring base must be
installed between the furnace and the floor. The
base must be ordered separately.
See table 2 for opening size to cut in floor.
SUPPLY AIR
PLENUM
Side to Side
mm
in
mm
13-1/4
337
502
16-3/4
413
19-3/4
502
The furnace and downflow combustible flooring base
shall not be installed directly on carpeting, tile, or other
combustible material other than wood flooring.
PROPERLY
SIZED FLOOR
OPENING
COMBUSTIBLE FLOOR OPENING SIZE
Cabinet
Width
A (14.5")
B (17.5")
C (21")
2 - After opening is cut, set combustible flooring base
into opening.
3 - Check sealing strips on combustible flooring base to
make sure they are properly glued and positioned.
4 - Lower supply air plenum into downflow combustible
flooring base until plenum flanges seal against the
strips.
NOTE - Be careful not to damage sealing strips.
Check for a tight seal.
5 - Set the furnace over the plenum.
6 - Ensure that the seal between the furnace and plenum
is adequate.
Installation on Cooling Cabinet (Figure 8)
1 - Refer to reverse-flow coil installation instructions
for correctly sized opening in floor and installation
of cabinet.
NOTE - Downflow combustible flooring kit is not
used
2 - When cooling cabinet is in place, set and secure
the furnace according to the instructions that are
provided with the cooling coil. Secure the furnace to
the cabinet.
3 - Seal the cabinet and check for air leaks.
Page 8
CAUTION
SUPPLY AIR PLENUM
DOWNFLOW
COMBUSTIBLE
FLOORING BASE
Figure 7
TABLE 2
Front to Rear
Side to Side
in
mm
in
15-3/4
22
569
18-3/4
22-3/4
mm
400
476
578
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