Allied Air A97USMV Installation Instructions Manual page 10

Setting and Upflow Unit
When the side return air inlets are used in an upflow
application, it may be necessary to install shims on the
bottom of the furnace.
Horizontal Applications
The A97USMV furnace can be installed in horizontal
applications with either right or left hand air discharge.
Refer to Figure 11 for clearances in horizontal applications.
Horizontal Application
Installation Clearances
Right-Hand Discharge
* Front clearance in alcove installation must be 24 in. (610 mm).
Maintain a minimum of 24 in. (610 mm) for front service access.
** An 8" service clearance must be maintained below the unit to
provide for servicing of the condensate trap. Unless the trap is
mounted remotely.
‡ 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
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.
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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.
Typical Horizontal Application
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, 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 1622
Figure 12
507028-03