Installation Guide

507332-01Page 10 of 35 Issue 1723
Table 1. Non-Combustible Floor Opening Size
Cabinet Width
Front to Rear Side to Side
in. mm in. mm
B Cabinet (17.5”)
19-3/4 502
16-5/8 422
C Cabinet (21”) 20-1/8 511
NOTE: Floor opening dimensions listed are 1/4 in. (6 mm)
larger than the unit opening. See dimension drawing on Page
2.
Figure 10.
Installation on Combustible Flooring
See Figure 11
1. When unit is installed on a combustible oor, a
downow combustible ooring base must be installed
between the furnace and the oor. The base must be
ordered separately. See Table 2 for opening size to
cut in oor.
The furnace and combustible ooring base shall not be
installed directly on carpeting, tile, or other combustible
material other than wood ooring.
CAUTION
Table 2. Combustible Flooring Base Opening Size
Cabinet
Width
Catalog
Number
Front to Rear Side to Side
in. mm in. mm
B Cabinet
(17.5”)
11M60
22 559
18-3/4 476
C Cabinet
(21”)
11M61 22-3/4 578
Figure 11.
2. After opening is cut, set the combustible ooring base
into opening.
3. Check berglass strips on the combustible ooring
base to make sure they are properly glued and
positioned.
4. Lower supply air plenum into the combustible ooring
base until plenum anges seal against berglass
strips.
NOTE: Be careful not to damage berglass 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
See Figure 12
NOTE: Downow combustible ooring kit is not used.
1. Refer to reverse ow coil installation instructions for
correctly sized opening in oor 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.