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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 14. Downflow Application Installation
Clearances
Installation on Non-Combustible Flooring
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.
Front to Rear
Cabinet Width
in.
B cabinet (17.5")
19-3/4
C cabinet (21")
NOTE: Floor opening dimensions listed are 1/4 in. (6 mm)
larger than the unit opening. See dimension drawing on Page
2.
Table 1. Non-Combustible Floor Opening Size
508405-01
0
0
0
0†
0
NC‡
Side to Side
mm
in.
mm
16-5/8
422
502
20-1/8
511
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 cabinet
11M60
(17.5")
C cabinet
11M61
(21")
Table 2. Combustible Flooring Base Opening Size
Issue 2341
Figure 15.
CAUTION
Front to Rear
Side to Side
in.
mm
in.
18-3/4
22
559
22-3/4
Figure 16.
Page 11 of 53
mm
476
578
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