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FURNACE INSTALLATION
*SC & *SD series gas furnaces offer a wide range of
installation options, including installation in the upflow or
horizontal positions with either right, left, or upflow return
air. *SL & *SM series gas furnaces may only be installed
as a downflow application.
General Requirements
• The furnace must be leveled at installation and attached
to a properly installed duct system. See
6)
for the required clearances needed to move the
furnace to its installation point (hallways, doorways,
stairs, etc).
• The furnace must be installed so that all electrical
components are protected from water.
• The furnace must be installed upstream from a
refrigeration system. (If applicable)
• The cabinet plug must always be used to close the hole
in the side of the furnace when rotating the inducer.
• The furnace requires special venting materials and
installation procedures. See
guidelines and specifications.
Upflow Furnaces
WARNING:
The furnace must not be installed directly on
carpeting,tile,or any combustible material other
than wood flooring.
*SC & *SD series gas furnaces are shipped with the
bottom panel installed as shown in
If the furnace is installed with side return air, the bottom
panel must not be removed. If the furnace is installed with
bottom return air, the bottom panel must be removed. See
Bottom Panel Removal on
Horizontal Furnaces
WARNING:
The furnace must not be installed directly on
carpeting,tile,or any combustible material other
than wood flooring.
*SC & *SD series gas furnaces can be installed horizontally
(Figure
11) in an attic, basement, crawl space or alcove.
It can also be suspended from a ceiling in a basement
or utility room in either a right to left airflow or left to right
airflow as shown in
Figure
These furnaces are shipped with the bottom panel installed.
If the furnace is installed horizontally, remove the bottom
panel from the furnace before attaching the duct system.
See Bottom Panel Removal on
If installing the furnace in an attic, it is required that a
drip pan be placed under the furnace. If the installation
is on a combustible platform as shown in
16
Figure 1 (page
pages 7-14
for venting
Figure 32 (page
page
22.
12.
page
22.
Figure
11, it is
recommended that the drip pan extend at least 12 inches
past the top and front of the furnace.
If suspending the furnace from the ceiling, assemble a
support frame
(Figure
full threaded rod. Fasten the frame together with nuts,
washers, and lockwashers. Secure the support frame to the
rafters with lag bolts. The furnace can also be suspended
using steel straps around each end of the furnace. The
straps should be attached to the furnace with sheet metal
screws and to the rafters with bolts.
It is recommended for further reduction of fire hazard
that cement board or sheet metal be placed between the
furnace and the combustible floor and extend 12 inches
beyond the front of the door and top of the furnace.
Flue pipe vented
to outside
Coil Plenum
Condensate
Combustion Air
Drain Lines
34).
Figure 11. *SC Horizontal installation on a Platform
Threaded
Figure 12. *SC Horizontally Suspended in Attic
Special Instructions for SC038-23A Furnaces
If installing an SC038-23A furnace horizontally (with airflow
going from left to right), the pressure switch will need to
be moved to the side of the furnace that is not facing the
ground. See
Figure 13 (page
will make it easier to replace in the future.
12) using slotted iron channel and
Two-pipe installation shown
Wood or
non-combustible
platform
J-Trap
Height
3" Min.
Nuts (x2)
Washer
and
Lockwasher
Nuts (x2)
Rod
17). Moving the switch
Lag
Bolt
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