Lennox DAVE SIGNATURE SL297UHNV Installation Instructions Manual page 7

WARNING
Improper installation of the furnace can result in personal
injury or death. Combustion and flue 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 fireplace or stove, etc. Fire, explosion,carbon
monoxide poisoning, personal injuryand/or property
damage could result.
Installation Clearances
Left Side
Bottom (Floor)
Top/Plenum
*Front
Back
Sides
Vent
Floor
*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.
‡For installations on a combustible floor, do not install the furnace
directly on carpeting, tile or other combustible materials other
than wood flooring.
FIGURE 6
Top
Right Side
1 in. (25 mm)
1
1
1†
1
0‡
Return Air Guidelines
Return air can be brought in through the bottom or either
side of the furnace installed in an upflow application. If the
furnace is installed on a platform with bottom return, make
an airtight seal between the bottom of the furnace and the
platform to ensure that the furnace operates properly and
safely. The furnace is equipped with a removable bottom
panel to facilitate installation.
Markings are provided on both sides of the furnace cab-
inet for installations that require side return air. Cut the
furnace cabinet at the maximum dimensions shown on
page 2.
Refer to Engineering Handbook for additional information.
SL297UHNV applications which include side return air
and a condensate trap installed on the same side of the
cabinet (trap can be installed remotely within 5 ft.) require
either a return air base or field-fabricated transition to ac-
commodate an optional IAQ accessory taller than 14.5".
See figure 7.
(with transition and filter)
Transition
Page 7
Side Return Air
20" X 25" X 1"
(508mmX635mmX 25mm)
Air Filter
Return
Air
Plenum
FIGURE 7