J801X Installation Manual

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.
Gas Inlet
Wood or
non-combustib
le
Platform
Type “B” Vent
Coil Plenum
Electrical Supply
Connection
Figure 7. J801X*U Horizontal Installed on a Platform
Figure 8. J801X*U Horizontally Suspended in Attic
Threaded
Rod
Lag
Bolt
Nuts (x2)
Washer
and
Lockwasher
Nuts (x2)
Concrete
Floor
Furnace
Sheet
Metal
Plenum
Figure 9. Furnace on a Concrete Slab
MODEL # DIM. “A” DIM. “B”
J801X054AD 13 1/4 19 1/4
J801X072BD 16 5/8 19 1/4
J801X090BD 16 5/8 19 1/4
J801X108CD 20 1/8 19 1/4
J801X126DD 23 5/8 19 1/4
NOTE: Dimensions shown in Inches.
Table 1. Cutout Dimensions
“A”
“B”
Opening in concrete floor
Downflow Installation
The furnace must not be installed directly on carpeting,
tile, or any combustible material other than wood flooring.
To install the furnace on combustible flooring, a special
sub-base is required.
WARNING:
Failure to install the downflow sub-base kit may
result in fire, property damage or personal injury.
WARNING:
The downflow sub-base kit must not be installed
directly on carpeting, tile, or any combustible
material other than wood flooring. Failure to
comply may result in fire, property damage or
personal injury.
Downflow sub-base kits are factory supplied accessories
and are listed according to the cabinet letter of the furnace.
For ‘A’ size cabinets use Sub-Base kit #902974 only. For ‘B’,
‘C’, and ‘D’ size cabinets use Kit #904911. 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 1.
2. Position the plenum and the furnace as shown in
Figure 9.