This appliance is certified for line contact when installing
in the horizontal left or right position. The line contact is
only permissible between lines that are formed by the
intersection of the top and two sides of the furnace and
the building joists, studs, or framing. This line may be in
contact with combustible material. The filter rack must be
a minimum distance of 18 in. (45.7 cm) from the furnace.
Maintain required clearances to combustibles. See Figure
10.
WARNING
When a furnace is installed in an attic or other
insulated space, keep all insulating materials at
least 12 in. (30.5 cm) away from furnace and burner
combustion air openings.
Important: During installation, doors must remain
on the furnace when moving or lifting.
When moving or handling this furnace before installation,
always leave the doors on the furnace to provide support
and to prevent damage or warping of the cabinet. When
lifting the furnace, support the ends of the furnace
rather than lifting by the cabinet flanges at the return air
openings, bottom or sides, or supply air opening.
It is acceptable to use the primary heat exchanger tubes
as a lifting point, provided that you lift the tubes at the
front of the heat exchangers where attached to the
vestibule panel. Do not use the top return bend of the
heat exchangers as lifting points, as the tubes may shift
out of position, or out of their location brackets or baffles.
Suspended furnace or crawl space
installation
It is possible to hang the furnace from floor joists or
install it on suitable blocks or pads. Ensure blocks or pad
installations provide adequate height so that the unit is
not subject to water damage.
You can also suspend units from rafters or floor joists
using rods, pipe angle supports, or straps. In all cases,
you must support the furnace with rods, straps, or angle
supports at three locations to adequately support the
furnace. Place one support at the supply end of the
furnace, one support in the center of the furnace near the
blower shelf, and the third support at the return end of
the furnace. Maintain a 6 in. (15.2 cm) minimum clearance
between the front of the furnace and the support rods or
straps.
All six suspension points must be level to ensure correct
and quiet furnace operation. When suspending the
furnace, use a secure platform constructed of steel angle
iron or unistrut secured to the floor or ceiling joists. See
Figure 11 for details and additional information.
Figure 11: Typical suspended furnace or crawl space
installation
Installation Manual: RL18 Single-Stage Standard ECM Residential Gas Furnaces (Non-condensing Multi-position Standard
Low NOx)
14
Johnson Controls Ducted Systems
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