438335-UIM-C-1209
8
Johnson Controls Unitary Products
ATTIC INSTALLATION
This appliance is certified for line contact when the furnace is installed
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. Refer to Figure 10.
When moving or handling this furnace prior to 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 open-
ings (bottom or sides) or supply air opening.
It is acceptable to use the primary heat exchanger tubes as a lifting
point provided that the tubes are lifted at the front of the heat exchang-
ers 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 their location brackets/baffles.
SUSPENDED FURNACE / CRAWL SPACE
INSTALLATION
The furnace can be hung from floor joists or installed on suitable blocks
or pad. Blocks or pad installations shall provide adequate height to
ensure the unit will not be subject to water damage. Units may also be
suspended from rafters or floor joists using rods, pipe angle supports or
straps. Angle supports should be placed at the supply air end and near
the blower deck. Do not support at return air end of unit. All four sus-
pension points must be level to ensure quite furnace operation. When
suspending the furnace use a secure platform constructed of plywood
or other building material secured to the floor joists. Refer to Figure 11
for typical crawl space installation.
When moving or handling this furnace prior to 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 open-
ings (bottom or sides) or supply air opening.
It is acceptable to use the primary heat exchanger tubes as a lifting
point provided that the tubes are lifted at the front of the heat exchang-
ers 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 their location brackets/baffles.
DOWNFLOW APPLICATION
To apply the furnace in a downflow position, it will be necessary to
rotate the vent blower 90° left or right so that the vent pipe passes
through the side of the furnace casing. See Figure 12.
FIGURE 10:
Typical Attic Installation
When a furnace is installed in an attic or other insulated space,
keep all insulating materials at least 12” (30.5 cm) away from fur-
nace and burner combustion air openings.
During installation, doors should remain on the furnace when
moving or lifting.
Return
Air
Sediment
Trap
Gas Piping
Supply
Air
Vent (Maintain
required
clearances to
combustibles)
Line contact only permissible
between lines formed by the
intersection of furnace top
and two sides and building
joists, studs or framing
12”
30” MIN.
Work Area
Filter rack
must be a minimum
distance
of 18” (45.7 cm)
from the
furnace
12”
Sheet metal in
front of furnace
combustion air
Openings is
Recommended
FIGURE 11:
Typical Suspended Furnace / Crawl Space Installation
During installation, doors should remain on the furnace when
moving or lifting.
FIGURE 12:
Downflow Venting
Support
Rod
Support
Angle (x3)
Maintain 6” minimum
clearance between support
rods and front of furnace
LEFT SIDE VENT
RIGHT SIDE VENT
Rotate vent
blower 90°
either way
