4 18-CD19D5-25
Installer’s Guide
LOCATION AND CLEARANCES
The location of the furnace is normally selected by the
architect, the builder, or the installer. However, before
the furnace is moved into place, be sure to consider the
following requirements:
1. Is the location selected as near the vent and as cen-
tralized for heat distribution as practical?
2. Do all clearances between the furnace and enclo-
sure equal or exceed the minimums shown in the
Table 1.
3. Is there sufficient space for servicing the furnace
and other equipment? A minimum of 24 inches
front accessibility to the furnace must be provided.
Any access door or panel must permit removal of
the largest component.
4. Are there at least 3 inches of clearance between the
furnace front panel and any closed panel or door
provided?
5. Are the vent pipe and combustion air inlet pipe
within vent table lengths? Will the pipes remain un-
obstructed?
6. Allow sufficient height in supply plenum above or
below the furnace to provide for cooling coil installa-
tion if the cooling coil is not installed at the time of
this furnace installation.
7. A furnace shall be installed so electrical components
are protected from water.
8. If the furnace is installed in a residential garage,
it must be installed so that the burners and the ig-
nition source are located not less than 18 inches (46
cm) above the floor and the furnace must be located
or protected to avoid physical damage from ve-
hicles.
IMPORTANT:
The furnace must be installed level. The only allowable
variation would be slightly to the left and/or forward in up-
flow installations or slightly toward the front in horizontal in-
stallations. This is necessary for proper condensate drain-
age.
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