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Downflow Application
Allow for clearances to combustible materials as indicated
on the unit nameplate. Minimum clearances for closet or
alcove installations are shown in Figure 13.
Downflow Application Installation Clearances
Left Side
Type of Vent
Connector
Top
1 in. (25 mm)
*Front
2-1/4 in. (57 mm)**
Back
Sides
Vent
6 in. (152 mm)
Floor
*Front clearance in alcove installation must be 24 in. (610 mm).
Maintain a minimum of 24 in. (610 mm) for front service access.
** 4-1/2 in. if a single wall vent pipe is used.
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.
Figure 13
Top
Right Side
Bottom
Type C
Type B1
1 in. (25 mm)
2-1/4 in. (57 mm)
0
0
0†
0
1 in. (25 mm)
NC††
NC††
Back
Figure 12
If this unit is being installed in a space serviced by an
exhaust fan, power exhaust fan, or other device which
may create a negative pressure in the space, take care
when sizing the inlet air opening. The inlet air opening
must be sized to accommodate the maximum volume
of exhausted air as well as the maximum volume of
combustion air required for all gas appliances serviced
by this space.
Improper installation of the furnace can result in personal
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 plenum. 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. Allow 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 property damage could
result.
Filters
This unit is not equipped with a filter or rack. A field-pro-
vided high-velocity filter is required for the unit to operate
properly. TABLE 3 lists recommended filter sizes. A filter
must be in place any time the unit is operating.
Page 10
Horizontal
CAUTION
WARNING
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