Downflow Furnaces; Installation On A Concrete Slab; Inducer & Venting Options - Oxbox J951X U Series Installation Instructions Manual

Flue pipe vented
to outside
Coil Plenum
Condensate
Combustion Air
Drain Lines
Figure 11. J951X*U Horizontal installation
on a Platform
Threaded
Rod
Figure 12. J951X*U Horizontally Suspended
in an Attic
Concrete
Floor
Figure 13. Furnace on a Concrete Slab
If suspending the furnace from the ceiling, assemble a
support frame ( ) using slotted iron channel and full
Figure 12
threaded rod. Fasten the frame together with nuts, washers,
and lockwashers. Secure the support frame to the rafters with
lag bolts. The furnace can also be suspended using steel
straps around each end of the furnace. The straps should
be attached to the furnace with sheet metal screws and to
the rafters with bolts.
It is recommended for further reduction of fire hazard that
cement board or sheet metal be placed between the furnace
and the combustible floor and extend 12 inches beyond the
front of the door and top of the furnace.
Two-pipe installation shown
Wood or
non-combustible
platform
J-Trap
Height
3" Min.
Nuts (x2)
Lag
Bolt
Washer
and
Lockwasher
Nuts (x2)
Furnace
Sheet
Metal
Plenum

Downflow Furnaces

WARNING:
The furnace must not be installed directly on
carpeting, tile, or any combustible material other
than wood flooring.
WARNING:
Failure to install the downflow sub-base kit may
result in fire, property damage or personal injury.
To install an J951X*D series gas furnace on combustible
flooring, a special sub-base is required. Downflow sub-base
kits are factory supplied accessories and are listed according
to the cabinet letter of the furnace. Refer to the technical sales
literature for part numbers. Please follow the instructions
provided with the kit.
A downflow sub-base kit is not necessary if the furnace is
installed on a factory or site-built cased air conditioning coil.
However, the plenum attached to the coil casing must be
installed so that its surfaces are at least 1" from combustible
construction.

Installation on a Concrete Slab

1. Create an opening in the floor according to the dimensions
in .
Table 3
2. Position the plenum and the furnace as shown in
Figure 13 .
Inducer & Venting Options
To increase installation flexibility, the inducer assembly can be
rotated up to 3 different positions. Each variation has slightly
different requirements with regard to condensate disposal
and, in some cases, the need to seal the furnace cabinet.
IMPORTANT NOTE:
The Inducer Assembly must never be positioned to vent
downwards on horizontal installs.
Opening in concrete floor
"B"
MODEL # DIM. "A"
J951X054BD
J951X072CD
J951X090CD
NOTE: Dimensions shown in Inches.
Table 3. Cutout Dimensions
"A"
DIM. "B"
16 5/8 19 1/4
20 1/8 19 1/4
20 1/8 19 1/4
15