Setting Equipment - Lennox G50DF(X)?24A?045 Installation Instructions Manual

Return Air Opening −− Downflow Units
The following steps should be taken when installing ple-
num:
1 − Bottom edge of plenum should be flanged with a
hemmed edge (See figure 7).
PLENUM
Side View
FIBERGLASS SEALING
STRIP
(Field Provided)
CABINET SIDE PANEL
FIGURE 7
2 − Fiberglass sealing strips should be used.
3 − In all cases, plenum should be secured to top flanges
of furnace with sheet metal screws.
4 − In closet installations, it may be impossible to install
sheet metal screws from the outside. In this case,
make plenum with a removable front and install
screws from the inside (See figure 8).
5 − Make certain that an adequate seal is made.
SECURE FROM
INSIDE CABINET
FIBERGLASS
SEALING STRIP
CABINET SIDE
(Field Provided)
PANEL
FIGURE 8

Setting Equipment

WARNING
Do not install the furnace on its front or its back. Do
not connect the return air ducts to the back of the fur-
nace. Doing so will adversely affect the operation of
the safety control devices, which could result in per-
sonal injury or death.
Install the G50DF(X) gas furnace as shipped. Do not
install the furnace horizontally.
Select a location that allows for the required clearances
that are listed on the unit nameplate. Also consider gas
supply connections, electrical supply, vent connection,
and installation and service clearances [24 inches (610
mm) at unit front]. The unit must be level.
SECURE FROM
OUTSIDE CABINET
HEMMED EDGE
PLENUM
Side View
HEMMED EDGE
NOTE − 1/3 hp blower motors are equipped with four flex-
ible mounting legs, and 1/2 hp blower motors are equipped
with three flexible legs and one rigid leg. The rigid leg is
equipped with a shipping bolt and a flat white plastic wash-
er (rather than the rubber mounting grommet used with a
flexible mounting leg). The bolt and washer must be re-
moved before the furnace is placed into operation. Af-
ter the bolt and washer have been removed, the rigid leg
will not touch the blower housing.
NOTE − G50DF−36C−110 units include a bracket which sta-
bilizes the blower motor during shipping. The bracket is se-
cured to the blower housing by two screws. This bracket
must be removed prior to placing the unit into opera-
tion. See figure 1.
Downflow Application
Allow for clearances to combustible materials as indi-
cated on the unit nameplate. Minimum clearances for
closet or alcove installations are shown in figure 9.
Downflow Application Installation Clearances
Left Side
Type of Vent
Connector
Top
*Front
Back
Sides
Vent
Floor
*Front clearance in alcove installation must be 24 in. (610 mm).
Maintain a minimum of 24 in. (610 mm) for front service access.
†Left side requires 3 in. if a single wall vent is used on 14 −1/2 in. cab-
inets, or 2 in. if a single wall vent is used on 17 − 1/2 in. cabinets.
††The furnace may be installed on a combustible wood floor if an
optional additive base is installed between the furnace and the
combustible floor.
Page 10
Top
Right Side
Bottom
Type C Type B1
1 in. (25 mm) 1 in. (25 mm)
3 in. (76 mm) 3 in. (76 mm)
0 0
0† 0
6 in. (152 mm) 1 in. (25 mm)
NC†† NC††
FIGURE 9