Page 9
Setting Equipment
WARNING
Do not install the furnace on its front or its back. Do not
connect the return air ducts to the back of the furnace.
Doing so will adversely affect the operation of the safety
control devices, which could result in personal injury or
death.
.The SL280UHV gas furnace can be installed as shipped
in either the upflow position or the horizontal position.
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,
and installation and service clearances [24 inches (610
mm) at unit front].
The unit must be level
.
NOTE - Units with 1/2 hp blower motors are equipped with
three flexible legs and one rigid leg. See figure 7. The rigid
leg is equipped with a shipping bolt and a flat white plastic
washer (rather than the rubber mounting grommet used
with a flexible mounting leg).
The bolt and washer must
be removed before the furnace is placed into opera-
tion. After the bolt and washer have been removed, the
rigid leg will not touch the blower housing.
RIGID LEG
remove shipping bolt and washer
SL280UHV07036A and
SL280UHV09036B WITH 1/2 HP
BLOWER MOTOR
FIGURE 7
Upflow Applications
Allow for clearances to combustible materials as indicated
on the unit nameplate. Minimum clearances for closet or
alcove installations are shown in figure 8.
Upflow Application Installation Clearances
Top
Bottom
Left Side
Right Side
AIR FLOW
Type of Vent
Connector
Type C
Type B1
Top
1 in. (25 mm)
1 in. (25 mm)
*Front
2-1/4 in. (57 mm)**
2-1/4 in. (57 mm)
Back
0
0
Sides
0
†
0
Vent
6 in. (152 mm)
1 in. (25 mm)
Floor
0
‡
0
‡
*Front clearance in alcove installation must be 24 in. (610 mm).
Maintain a minimum of 24 in. (610 mm) for front service access.
** 3-1/4 in. if single wall vent pipe is used.
‡
For installation on a combustible floor, do not install the furnace
directly on carpeting, tile or other combustible materials other
than wood flooring.
†
Left side requires 3 inches if a single wall vent is used on 14-1/2
inch
nets.
FIGURE 8
