Page 12
This furnace may be installed in either an attic or a crawl-
space. Either suspend the furnace from roof rafters or floor
joists, as shown in figure 12, or install the furnace on a plat-
form, as shown in figure 13. The unit must be supported at
both ends and beneath the blower deck to prevent sagging.
Typical Horizontal Application
Unit Suspended in Attic or Crawlspace
Leave sufficient clearance between rod and unit to
remove access panel.
FIGURE 12
1/4 in. ROD
ANGLE
IRON
U−CHANNELS
NOTE − Heavy−gauge perforated sheet metal straps
(plumbers’ straps) may be used to suspend the unit from
roof rafters or ceiling joists. When straps are used to sus-
pend the unit in this way, support must be providedfor both
the ends and the middle of the furnace to prevent sagging.
The straps must not interfere with the plenum or exhaust
piping installation. Securing screws should be 1/2 inch
from the top edge and 1−1/2 inch from the side edge in all
cases.
Cooling coils and supply and return air plenums
must be supported separately.
NOTE − When the furnace is installed on a platform in a
crawlspace, it must be elevated enough to avoid water
damage and to allow the evaporator coil to drain.
Return Air −− Horizontal Applications
Return air can be brought in through the end of a furnace
installed in a horizontal application. The furnace is
equipped with a removable bottom panel to facilitate instal-
lation. See figure 9.
Horizontal Application
Unit Installed on Platform
WORKING
PLATFORM
GAS
ENTRY
VENT
PIPE
NOTE − Line contact is permis-
sible. See the unit nameplate for
clearances.
FIGURE 13
WARNING
Improper installation of the furnace can result in per-
sonal injury or death. Combustion and flue products
must never be allowed to enter the return air system
or the living space. Use screws and joint tape to seal
the return air system to the furnace.
In platform installations with bottom return air, the
furnace should be sealed airtight to the return air ple-
num. A door must never be used as a portion of the
return air duct system. The base must provide a
stable support and an airtight seal to the furnace. Al-
low absolutely no sagging, cracks, gaps, etc.
The return and supply air duct systems must never
be connected to or from other heating devices such
as a fireplace or stove, etc. Fire, explosion, carbon
monoxide poisoning, personal injury and/or proper-
ty damage could result.
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 inju-
ry or death.
