BG802DF Installation Instructions

508145-01B Issue 2108 Page 9 of 36
RIGID LEG
remove shipping bolt and washer
Units with 1/2 or 3/4 HP Blower Motor
Figure 7.
The blower access panel must be securely in place
when the blower and burners are operating. Gas fumes,
which could contain carbon monoxide, can be drawn
into living space resulting in personal injury or death.
WARNING
Downow Installation
Downow unit installs in three ways: on non-combustible
ooring, on combustible ooring using a downow
combustible ooring base, or on a reverse-ow cooling
cabinet. Do not drag the unit across the oor.
Installation on Non-Combustible Flooring
(Figure 8)
1. Cut oor opening keeping in mind clearances listed
on unit rating plate. Also keep in mind gas supply
connections, electrical supply, ue and air intake
connections and su󰀩cient installation and servicing
clearances. See Table 1 for correct oor 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.
Figure 8.
UNIT
SUPPLY AIR
PLENUM
OPENING
Cabinet
Width
Front to Rear Side to Side
in mm in mm
A (14-1/2”) 19-3/4 502 13-1/4 337
B (17-1/2”) 19-3/4 502 16-1/4 413
NOTE - Floor opening dimensions listed are 1/4 inch (6 mm)
larger than the unit opening. See unit dimensions on Page
2.
Table 1. Non-Combustible Floor Opening Size
Installation on Combustible Flooring
(Figure 9)
1. When unit is installed on a combustible oor, a
downow combustible ooring base must be installed
between the furnace and the oor. The base must be
ordered separately. See Table 2 for opening size to
cut in oor.
2. After opening is cut, set combustible ooring base into
opening.
3. Check sealing strips on combustible ooring base to
make sure they are properly glued and positioned.
4. Lower supply air plenum into downow combustible
ooring base until plenum anges 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.
The furnace and downow combustible ooring base
shall not be installed directly on carpeting, tile, or other
combustible material other than wood ooring.
IMPORTANT
Figure 9.
UNIT
SUPPLY AIR PLENUM
DOWNFLOW
COMBUSTIBLE
FLOORING BASE
PROPERLY
SIZED FLOOR
OPENING