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Horizontal Applications
Do not install the furnace on its front or its back. See
Figure 10.
Figure 10.
The A98USMV furnace can be installed in horizontal
applications with either right or left hand air discharge.
Refer to Figure 11 for clearances in horizontal applications.
Right-Hand Discharge
L
e
t f
E
n
d
AIR FLOW
Air
Flow
Bottom (Floor)
Left-Hand Discharge
L
e
t f
E
n
d
Bottom (Floor)
Top/Plenum
* Front
Back
Sides
Vent
Floor
* Front clearance in alcove installation must be 24 in. (610
mm). Maintain a minimum of 24 in. (610 mm) for front service
access.
† Allow proper clearances to accommodate condensate trap.
‡ For installations on a combustible floor, do not install
the furnace directly on carpeting, tile or other combustible
materials other than wood flooring.
Figure 11. Installation Clearances
Horizontal Applications
508364-01
WARNING
R
g i
t h
Flow
R
g i
t h
AIR FLOW
1 in. (25 mm)
0
0
0†
0
0‡
Suspended Installation of Horizontal Unit
This furnace may be installed in either an attic or a
crawlspace. Either suspend the furnace from roof rafters or
floor joists, as shown in Figure 12 or install the furnace on
a platform, as shown in Figure 13. A horizontal suspension
kit (51W10) may be ordered or use equivalent.
NOTE: Heavy gauge sheet metal straps may be used to
suspend the unit from roof rafters or ceiling joists. When
straps are used to suspend the unit in this way, support
must be provided for both the ends. The straps must not
interfere with the plenum or exhaust piping installation.
Cooling coils and supply and return air plenums must be
supported separately.
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.
E
n
d
Air
Figure 12. Typical Horizontal Application
Platform Installation of Horizontal Unit
1.
Select location for unit keeping in mind service and
E
n
d
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, unless trap is installed remotely.
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.
Issue 2346
Page 9 of 74
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