5894307-UIM-B-0920
Johnson Controls Ducted Systems
5
RESIDENTIAL HOME UPFLOW RETURN PLENUM
CONNECTION
Return air can enter the furnace through the sides or bottom, depending
on the type of application. Return air must not be connected into the
rear panel of the unit.
SIDE RETURN APPLICATION
Side return applications pull return air through an opening cut in the
side of the furnace casing. This furnace is supplied with a bottom block-
off panel that must be left in place if a side return is used. If the furnace
is installed on a flat, solid surface, this bottom panel provides an ade-
quate seal to prevent air leakage through the unused bottom opening.
However, if the furnace is installed on a surface that is uneven, or if it is
installed on blocks or otherwise raised off the floor,
it is necessary to
seal the edges of the bottom panel to the casing using tape or
other appropriate gasket material to prevent air leakage.
BOTTOM RETURN AND ATTIC INSTALLATIONS
Bottom return applications normally pull return air through a base plat-
form or return air plenum. Make sure the return platform structure or
return air plenum is suitable to support the weight of the furnace.
The internal bottom panel must be removed for this application.
Attic installations must meet all minimum clearances to combustibles
and have floor support with required service accessibility.
HORIZONTAL APPLICATION
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
can be in contact with combustible material. See Figure 4.
Figure 2:
Furnace and Coil Attachment
A1107-001
NOTE:
Verify that all drains
are trapped or plugged.
UPFLOW
APPLICATION
PRIMARY DRAIN
TRAP CONNECTION
SECONDARY DRAIN
TRAP CONNECTION
DRAIN PLUG
FOR HORIZONTAL
SECONDARY DRAIN
PRIMARY DRAIN
TRAP CONNECTION
COIL
COIL
RIGHT FLOW
APPLICATION
LEFT FLOW
APPLICATION
COIL
DRAIN PLUG
FOR VERTICAL
SECONDARY DRAIN
FURNACE
FURNACE
FURNACE
Figure 3:
Horizontal Application
IMPORTANT:
This furnace can be installed in a horizontal position
on either side as shown above.
It must not be installed on its back.
Figure 4:
Typical Attic Installation
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.
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
!
