Page 9
COOLING COIL
PLENUM
PROPERLY
SIZED FLOOR
OPENING
FIGURE 8
Return Air Opening -- Downow Units
The following steps should be taken when installing ple-
num:
1 - Bottom edge of plenum should be anged with a
hemmed edge (See gure 9).
SECURE FROM
OUTSIDE CABINET
HEMMED EDGE
PLENUM
SEALING STRIP
(Field Provided)
CABINET SIDE PANEL
Side View
FIGURE 9
2 - Sealing strip should be used.
3 - In all cases, plenum should be secured to top
anges of furnace with sheet metal screws.
SIDE CABINET
HEMMED EDGE
FIBERGLASS
SEALING STRIP
(Field Provided)
CABINET SIDE
PANEL
PLENUM
Side View
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 gure 10).
5 - Make certain that an adequate seal is made.
Setting Equipment
WARNING
Do not install the furnace on its front, back or in the
horizontal position. See gure 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 ML180DF gas furnace as shipped in the down-
ow position only. Do not install the furnace horizon-
tally.
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 1/3HP and 1/2HP blower motors are
equipped with three exible legs and one shipping leg. See
gure 11. In some units with 1/3HP blower motor, the ship-
ping leg is exible with rubber mounting grommets similar
to the other three mounting legs and require no modica-
tion. The rest of the units with 1/3HP and 1/2HP blower
motors (these blower motor housings will be tagged) have
a rigid shipping leg equipped with a shipping bolt and at
white plastic washer. 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.
RIGID LEG
(Remove shipping bolt
and washer)
Blower motor with three exible legs and one
rigid shipping leg. Blower motor housings
will be tagged for shipping bolt removal
FIGURE 11
WARNING
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.
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