Installation Guide

16
Figure11.*SCHorizontalinstallationonaPlatform
Flue pipe - vented
to outside
Wood or
non-combustible
platform
Coil Plenum
Electrical
Connection
Combustion Air
Condensate Drain Lines
One-pipe installation shown
PVC Tee
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 (Figure 13, page 17). Moving the switch will make
it easier to replace in the future.
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 Figure 1 (page 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 pages 7 -14 for venting
guidelines and specifications.
UpowFurnaces
WARNING:
Thefurnacemustnotbeinstalleddirectlyon
carpeting,tile,oranycombustiblematerialother
thanwoodooring.
*SC & *SD series gas furnaces are shipped with the
bottom panel installed as shown in Figure 32 (page 34).
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 page 22.
Horizontal Furnaces
WARNING:
Thefurnacemustnotbeinstalleddirectlyon
carpeting,tile,oranycombustiblematerialother
thanwoodooring.
*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 12.
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 page 22.
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 (Figure 11), it is recommended
Figure12.*SCHorizontallySuspendedinAttic
Lag
Bolt
Nuts (x2)
Washer
and
Lockwasher
Nuts (x2)
Threaded
Rod
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 12) using slotted iron channel and
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.