507769C05Page 10 of 55
NOTE - Do not install the furnace on its front, back or in the horizontal position
Front
Back
Horizontal
Figure 11.
Refer to Figure 13 for clearances in downow applications.
Top
Bottom
Left Side Right Side
Top 0
*Front 0
Back 0
Sides 0†
Vent 0
Floor NC ‡
*Front clearance in alcove installation must be 24 in. (610 mm).
Maintain a minimum of 24 in. (610 mm) for front service access.
†Allow proper clearances to accommodate condensate trap.
‡The furnace may be installed on a combustible wood oor if an optional
additive base is installed between the furnace and the combustible oor.
Figure 13. Downow Application Installation
Clearances
Top 0
*Front 0
Back 0
Sides 0†
Vent 0
Floor NC‡
*Front clearance in alcove installation must be 24 in. (610
mm). Maintain a minimum of 24 in. (610 mm) for front service
access.
†Allow proper clearances to accommodate condensate trap.
‡The furnace may be installed on a combustible wood oor if
an optional additive base is installed between the furnace and
the combustible oor.
Installation on Non-Combustible Flooring
See Figure 14
1. Cut oor opening keeping in mind clearances listed
on unit rating plate. Also keep in mind gas supply
connections, electrical supply, ue and air intake
connections and sucient installation and servicing
clearances. See Table 1 for correct oor opening size.
2. Flange warm air plenum and lower the plenum into the
opening.
Figure 12. Setting Equipment
FRONT VIEW SIDE VIEW
AIR FLOW
AIR FLOW
1/2"
max.
AIR FLOW
SIDE VIEW
Unit must be level side−to−side. Unit may be positioned
from level to 1/2" toward the front to aid in draining.
Improper installation of the furnace can result in
personal injury or death. Combustion and ue products
must never be allowed to enter the return air system or
air in the living space. Use sheet metal screws and joint
tape to seal return air system to furnace.
In platform installations with furnace return, the furnace
should be sealed airtight to the return air plenum. A door
must never be used as a portion of the return air duct
system. The base must provide a stable support and an
airtight seal to the furnace. Allow absolutely no sagging,
cracks, gaps, etc.
For no reason should return and supply air duct systems
ever be connected to or from other heating devices
such as a replace or stove, etc. Fire, explosion, carbon
monoxide poisoning, personal injury and/or property
damage could result.
WARNING
The unit may be installed three ways in downow
applications: on non-combustible ooring, on combustible
ooring using an additive base, or on a reverse-ow
cooling coil cabinet. Do not drag the unit across the oor
in the downow position. Floor and furnace ange damage
will result.