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combustible flooring without a separate sub-
base. Also, the furnace rear mounting plate
(see Figure 3) supplied with the duct connec-
tors is recommended for use with this type of
installation.
Selecting Duct Connector
Non Platinum Duct Connector
1.
Determine depth of floor cavity from sur-
face of floor to top of supply air duct (see
Figure 5).
2.
Select appropriate model from Table 4
which matches X-dimension of floor cavity.
To maximize air delivery, remove reducer
(C in Figure 5) to obtain largest open area
that will fit duct/floor construction.
NOTE:
Duct connectors may be
installed in any one of four positions.
Platinum Duct Connector
1.
The 14" round duct connector (903896) is
designed to connect directly to a 14" flex-
duct.
2-3/8" MIN
(60 mm)
17"
(432 mm)
23-3/4"
(603 mm)
3-3/4"
(95 mm)
3/4"
(19 mm)
Furnace Outer
Door
Figure 6. Downflow Floor Cutout Locations (nominal dimensions)
10
English
7/8"
2"
4 1/4"
6 1/4"
8 1/4"
10 1/4"
12 1/4"
Preparing Floor Opening(s)
1.
Mark floor opening(s) as shown in Figure
6. Provide minimum clearances at rear and
right side walls of closet or alcove for
installation of furnace and wiring.
2.
Cut floor opening on outside edge of marked
line so that opening is slightly larger than
area marked.
3.
Additional provisions may be necessary
for optional air conditioning or heat pump if
refrigerant lines are installed elsewhere
than at the front of the furnace.
4.
The refrigerant and entrance supply open-
ing dimensions may be adjusted ± 1/2".
REAR WALL OF ENCLOSURE
Center Line
14-1/2"
(368 mm)
14-1/2"
(368 mm)
Optional Supply Wire
Entrance
A/C Or HP
(Not required
Optional
for Platinum)
Refrigerant
Line
4-1/4
"
5
"
3-3/8
(127 mm)
(108 mm)
(86 mm)
10
"
(254 mm)
20 "
(508 mm)
If "X"
Use Duct Connector
floor cavity is:
Model Part Number
Metric (mm) Finger Tab Screw Down
22
901987
51
901988
108
901989
159
901990
210
901991
260
901992
311
901993
Table 4. Floor Cavity Sizes
16-5/8"
(422 mm)
3" (76 mm)
"
6-1/4
"
(159 mm)
904008
904009
904010
904011
904012
904013
904014
Furnace
Outline
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