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AIR FLOW
AIR FLOW
FRONT VIEW
SIDE VIEW
Unit must be level side−to−side. Unit may be positioned
from level to 1/2" toward the front to aid in draining.
Figure 11. Setting Equipment
Figure 12.
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
air in the living space. Use sheet metal screws and joint
tape to seal return air system to furnace.
In platform installations with furnace return, 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.
For no reason should return and supply air duct systems
ever 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.
The unit may be installed three ways in downflow
applications: on non-combustible flooring, on combustible
flooring using an additive base, or on a reverse-flow
cooling coil cabinet. Do not drag the unit across the floor
in the downflow position. Floor and furnace flange damage
will result.
Refer to Figure 13 for clearances in downflow applications.
Page 10 of 53
AIR FLOW
SIDE VIEW
WARNING
Left Side
1/2"
max.
Top
*Front
*Front
Back
Sides
Vent
Floor
*Front clearance in alcove installation must be 24 in. (610
*Front clearance in alcove installation must be 24 in. (610 mm).
mm). Maintain a minimum of 24 in. (610 mm) for front service
Maintain a minimum of 24 in. (610 mm) for front service access.
access.
†Allow proper clearances to accommodate condensate trap.
‡The furnace may be installed on a combustible wood oor if an optional
†Allow proper clearances to accommodate condensate trap.
additive base is installed between the furnace and the combustible oor.
‡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. Downflow Application Installation
Installation on Non-Combustible Flooring
See Figure 14
1.
Cut floor opening keeping in mind clearances listed
on unit rating plate. Also keep in mind gas supply
connections, electrical supply, flue and air intake
connections and sufficient installation and servicing
clearances. See Table 1 for correct floor opening size.
2.
Flange warm air plenum and lower the plenum into the
opening.
3.
Set the unit over the plenum and seal the plenum to
the unit.
4.
Ensure that the seal is adequate.
Cabinet Width
B cabinet (17.5")
C cabinet (21")
NOTE: Floor opening dimensions listed are 1/4 inch (6 mm)
larger than the unit opening. See dimension drawing on Page
2.
Table 1. Non-Combustible Floor Opening Size
Issue 1933
Top
Right Side
Bottom
Top
Back
Sides
Vent
Floor
Clearances
Front to Rear
in.
mm
19-3/4
502
19-3/4
502
0
0
0
0
0
0
0†
0†
0
0
NC‡
NC ‡
Side to Side
in.
mm
16-5/8
422
20-1/8
511
507735-03
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