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PROPERLY
SIZED FLOOR
OPENING
Figure 8
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 9)
.
PLENUM
Side View
SEALING STRIP
(Field Provided)
CABINET SIDE PANEL
Figure 9
2 - Sealing strip should be used.
3 - In all cases, plenum should be secured to top flanges
of furnace with sheet metal screws.
SIDE CABINET
FIBERGLASS
SEALING STRIP
CABINET SIDE
(Field Provided)
Figure 10
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 10).
5 - Make certain that an adequate seal is made.
COOLING COIL
PLENUM
SECURE FROM
OUTSIDE CABINET
HEMMED EDGE
PLENUM
Side View
HEMMED EDGE
PANEL
Setting Equipment
Do not install the furnace on its front, back or in the
horizontal position. See figure 12. Do not connect the
return air ducts to the back of the furnace. Doing so
will adversely affect the operation of the safety control
devices, which could result in personal injury or death.
Install the ML180DFE gas furnace as shipped in the
downflow position only. Do not install the furnace hori-
zontally.
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.
NOTE - Units with 1/2 and 3/4 hp blower motors are
equipped with three flexible legs and one rigid leg. See fig-
ure 11. The rigid leg is equipped with a shipping bolt and a
flat white plastic washer (rather than the rubber mounting
grommet used with a flexible mounting leg). The bolt and
washer must be removed before the furnace is placed
into operation. After the bolt and washer have been re-
moved, the rigid leg will not touch the blower housing.
Units with 1/2 or 3/4 HP Blower Motor
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.
Page 9
WARNING
RIGID LEG
remove shipping bolt and washe
Figure 11
WARNING
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