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*Front
Back
Sides
Vent
Floor
* Front clearance in alcove installation must be 24 in. (610
mm). Maintain a minimum of 24 in. (610 mm) for front service
access.
† Allow proper clearances to accommodate condensate trap.
‡ 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 15. Downflow Application Installation
Clearances
Installation on Combustible Flooring
1.
When unit is installed on a combustible floor, a
downflow combustible flooring base must be installed
between the furnace and the floor. The base must be
ordered separately. See Table 2 for opening size to
cut in floor.
The furnace and combustible flooring base shall not be
installed directly on carpeting, tile, or other combustible
material other than wood flooring.
Cabinet
Catalog
Width
Number
B (17.5")
11M60
C (21")
11M61
Table 2. Combustible Flooring Base Opening Size
508391-01
0
0
0
0†
0
NC‡
CAUTION
Front to Rear
Side to Side
in.
mm
in.
22
559
18-3/4
22
559
22-3/4
2.
After opening is cut, set the combustible flooring base
into opening.
3.
Check fiberglass strips on the combustible flooring
base to make sure they are properly glued and
positioned.
4.
Lower supply air plenum into the combustible flooring
base until plenum flanges seal against fiberglass
strips.
NOTE: Be careful not to damage fiberglass strips.
Check for a tight seal.
5.
Set the furnace over the plenum.
6.
Ensure that the seal between the furnace and plenum
is adequate.
Installation on Cooling Coil Cabinet
NOTE: Downflow combustible flooring kit is not used.
1.
Refer to reverse-flow coil installation instructions for
correctly sized opening in floor and installation of
cabinet.
2.
When cooling cabinet is in place, set and secure the
furnace according to the instructions that are provided
with the cooling coil. Secure the furnace to the cabinet.
3.
Seal the cabinet and check for air leaks.
mm
476
578
Issue 2327
Figure 16.
Page 11 of 52
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