Allied A97USMV, Installation Instructions Manual

Page: 10 / 78

506887-01 Page 10 of 78 Issue 1213
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.
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.
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.
Typical Horizontal Application
Figure 12
Figure 11
Horizontal Application
Installation Clearances
Right-Hand Discharge
* Front
0
Back
0
Ends
0
Vent
Floor
0
0‡
Top
0
* 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.