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NOTE - When the furnace is installed on a platform in a
crawlspace, it must be elevated enough to avoid water
damage and to allow the evaporator coil to drain.
HORIZONTAL SUSPENSION KIT
Metal Strap
(typical)
Bracket
(typical)
FIGURE 12
Platform Installation of Horizontal Unit
1 - Select location for unit keeping in mind service and
other necessary clearances. See FIGURE 11.
2 - Construct a raised wooden frame and cover frame
with a plywood sheet. If unit is installed above
finished space, fabricate an auxiliary drain pan
to be installed under unit. Set unit in drain pan as
shown in FIGURE 13. Leave 8 inches for service
clearance below unit for condensate trap.
3 - Provide a service platform in front of unit. When
installing the unit in a crawl space, a proper support
platform may be created using cement blocks.
4 - Route auxiliary drain line so that water draining from
this outlet will be easily noticed by the homeowner.
5 - If necessary, run the condensate line into a
condensate pump to meet drain line slope
requirements. The pump must be rated for use
with condensing furnaces. Protect the condensate
discharge line from the pump to the outside to avoid
freezing.
6 - Continue with exhaust, condensate and intake
piping installation according to instructions.
INTAKE PIPE
EXHAUST PIPE
*Gas connector may be
used
for
Canadian
able by local authority
having jurisdiction.
SERVICE PLATFORM
FIGURE 13
Internal Brace
(provided with kit)
Air
Flow
*GAS CONNECTION
RAISED
PLATFORM
Return Air -- Horizontal Applications
Return air must be brought in through the end of a fur-
nace installed in the horizontal position. The furnace is
equipped with a removable bottom panel to facilitate in-
stallation. See FIGURE 7.
Filters
This unit is not equipped with a filter or rack. A field-provid-
ed filter is required for the unit to operate properly. TABLE
1 lists recommended filter sizes.
If a highefficiency filter is being installed as part of this
system to ensure better indoor air quality, the filter must
be properly sized. Highefficiency filters have a higher
static pressure drop than standard efficiency glass/foam
filters. If the pressure drop is too great, system capacity
and performance may be reduced. The pressure drop
may also cause the limit to trip more frequently during
the winter and the indoor coil to freeze in the summer,
resulting in an increase in the number of service calls.
Before using any filter with this system, check the
specifications provided by the filter manufacturer against
the data given in the appropriate Lennox Product
Specifications bulletin. Additional information is provided
in Service and Application Note ACC002 (August 2000).
A filter must be in place when the unit is operating.
NOTE - In upflow applications where side return air filter is
installed on same side as the condensate trap, make sure
that clearance is maintained to ensure future access to
the filter access panel.
Furnace
Cabinet Width
17-1/2"
21"
24-1/2"
Duct System
Use industry-approved standards to size and install the
supply and return air duct system. This will result in a qui-
et and low-static system that has uniform air distribution.
See below for proper duct installation.
SUPPLY
AIR
UPFLOW UNIT
Page 10
IMPORTANT
TABLE 1
Filter Size
Side Return
Bottom Return
16 X 25 X 1 (1)
16 X 25 X 1 (1)
16 X 25 X 1 (1)
20 X 25 X 1 (1)
16 X 25 X 1 (2)
24 X 25 X 1 (1)
HORIZONTAL UNIT
FIGURE 14
Install self tapping screws
to seal any potential air
leaks
SUPPLY
AIR
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