16
Condensate Drain Lines
The methods for draining condensate out of the system
depend on the confi guration selected. See Figures 25-28
(pages 39-42) for your particular application.
Four general principles apply:
• Each condensate drain line must be separately trapped
using a J-Trap or fi eld supplied loop.
• There must always be a drain attached to the collector
at the outlet of the secondary heat exchanger.
• There must always be a drain at the outlet of the inducer
assembly.
• There must always be a drain at the lowest point of the
venting system.
Exceptions and clarifi cations to the general rules:
• In some cases, the lowest point in the vent system is
where it connects to the inducer (Options 8, 10, 12, &
14). In this case one drain at this location is suffi cient.
• If the vent exits the furnace horizontally, the vent may
be turned vertically with a tee. The drip leg formed by
the tee must include a drain (Options 2,3,5,6,8,9,12,1
3,16,17,19, & 20).
• In certain cases, it is permitted to drain the inducer
back into the top drain of the collector (Options 2, 7,
11, 15 & 16). Take care that this drain does not sag in
the middle.
Direct Vent (2-Pipe) Applications
It is important that Direct Vent (2-pipe) systems maintain
an airtight fl ow path from the air inlet to the fl ue gas outlet.
The furnace ships from the factory with two holes in the
cabinet for the air inlet and fl ue gas outlet. In certain
confi gurations, it is necessary to remove and relocate a
plastic cap in the furnace cabinet. If changing the position
of the air inlet and fl ue gas outlet, it is required that the
previous hole be closed off with the plastic cap to maintain
air tightness in the furnace. The hole locations for *SC
series upfl ow/horizontal furnaces are indicated in Figure
22 (page 28). For *SL downfl ow installations, the hole
locations are shown in Figure 23 (page 29).
Upfl ow Installation
WARNING:
The furnace must not be installed directly on
carpeting, tile, or any combustible material other
than wood fl ooring.
The *SC series gas furnace may be installed directly
on combustible wood fl ooring or supports. For venting
guidelines and specifi cations, see Venting Requirements
section (page 11).
Side Return Air Inlet
*SC series gas furnaces are shipped with the bottom
panel installed (Figure 22). If the furnace is installed using
both side return air inlets, the bottom panel must not be
removed. If the bottom of the furnace is not being used
as a return, leave the bottom panel in place.
Bottom Return Air Inlet
If the *SC series gas furnace is installed using the
bottom as a return air inlet and 1 side return, the bottom
panel (Figure 22) must be removed. (See Bottom Panel
Removal).
Horizontal Installation
WARNING:
The furnace must not be installed directly on
carpeting, tile, or any combustible material other
than wood fl ooring.
The *SC series gas furnace can be installed horizontally
in an attic, basement, crawl space or alcove (Figure 13).
It can also be suspended from a ceiling in a basement
or utility room in either a right to left airfl ow or left to right
airfl ow as shown in Figure 14.
Figure 14. *SC Horizontally Suspended in
Attic or Crawl Space
Figure 13. *SC Horizontal installation on a Platform
Exhaust
Combustible
Platform
Coil Plenum
Electrical Supply
Connection
Condesate Drain
(Connect to drain)
Note: Line Contact
Is Permissible