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the front blower
Unit must be level side-to-side. Unit must be positioned with a slight slope up to a 1/2" toward the front to aid in draining.
Allow for clearances to combustible materials as indicated
on the unit nameplate. Minimum clearances for closet or
alcove installations are shown in Figure 5.
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 5. Installation Clearances
Upflow Applications
508364-01
Place level on
deck to check
side to side
AIR FLOW
FRONT VIEW
Top
Right Side
1 in. (25 mm)
0
0
0†
0
0‡
SETTING EQUIPMENT
UPFLOW APPLICATION
Place level on blower
deck screws to check
forward tilt
UNIT
FRONT
HORIZONTAL APPLICATION
UNIT
FRONT
END VIEW
Figure 4.
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,
condensate trap and drain connections, and installation and
service clearances (24 inches [610 mm] at unit front). The
unit must be level from side to side, for proper operation.
Tilt the unit slightly (maximum 1/2 in. from level) from back
to front to aid in the draining of the heat exchanger. See
Figure 4.
A98USMV applications that include side return air and a
condensate trap installed on the same side of the cabinet
(trap can be installed remotely within 5 feet) require either a
return air base or field fabricated transition to accommodate
an optional IAQ accessory taller than 14.5". See Figure 6.
Return Air – Upflow Units
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 cabinet
for installations that require side return air. Cut the furnace
cabinet at the maximum dimensions shown on Page 2.
Setting an Upflow Unit
When the side return air inlets are used in an upflow
application, it may be necessary to install shims on the
bottom of the furnace.
Issue 2346
AIR FLOW
1/2"
max.
SIDE VIEW
1/2"
max.
Page 7 of 74
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