Allied Air A80DS2V, Installation Instructions Manual

Page: 10 / 63

506892-01 Page 10 of 64 Issue 1251
Return Air Opening — Downflow Units
The following steps should be taken when installing plenum:
1.
Bottom edge of plenum should be flanged with a
hemmed edge (See Figure 10).
2. Sealing strip should be used.
3. In all cases, plenum should be secured to top flanges of
furnace with sheet metal screws.
4. In closet installations, it may be impossible to install sheet
metal screws from the outside. In this case, make
plenum with a removable front and install screws from
the inside (See Figure 11).
5. Make certain that an adequate seal is made.
Setting Equipment
Install this gas furnace as shipped in the downflow position
ONLY.
Do not install the furnace horizontally.
Select a location that allows for the required clearances that
are listed on the unit nameplate. Also consider gas supply
connections, electrical supply, vent connection, and
installation and service clearances [24 inches (610 mm) at
unit front].
The unit must be level.
NOTE: Units with 1/2 hp blower motors are equipped with
three flexible legs and one rigid leg. See Figure 12. The
rigid leg is equipped with a shipping bolt and a flat white
plastic washer (rather than the rubber mounting grommet
used with a flexible mounting leg).
The bolt and washer
must be removed before the furnace is placed into
operation.
After the bolt and washer have been removed,
the rigid leg will not touch the blower housing.
Figure 9
Figure 10
Figure 11
Figure 12
WARNING
The blower access panel must be securely in place when
the blower and burners are operating. Gas fumes, which
could contain carbon monoxide, can be drawn into living
space resulting in personal injury or death.
WARNING
Do not install the furnace on its front, back or in the
horizontal position. See Figure 13. Do not connect the
return air ducts to the back of the furnace. Doing so will
adversely affect the operation of the safety control
devices, which could result in personal injury or death.