035-17438-001 Rev. A (901)
10
Unitary Products Group
Upflow furnaces may be installed horizontally with the supply
airflow toward the left or right by laying the unit on the left or
right side panel.
After determining the best orientation, lay the unit on top of
the shipping carton to protect the finish.
The appropriate electrical knock-outs for power wiring, con-
trol wiring and gas piping should be removed at this time.
For horizontal application, return air may enter through the
bottom, left side or right side panel or any combination of
these openings.
Return air may not be connected into the
rear panel of the unit.
To convert the upflow model furnace to open bottom, see
“Bottom Return” section of this manual.
ATTIC INSTALLATION
This appliance is design certified for line contact for furnaces
installed horizontally. The intersection of the furnace top and
sides form a line. This line may be in contact with combustible
material.
Secure a platform constructed of plywood or other building
material to the floor joists. Sheet metal, 12" in front of the fur-
nace combustion air openings is recommended. Refer to Fig-
ure 6 on page 10.
NOTE:
See crawl space installation for suspending the fur-
nace in attic installations.
CRAWL SPACE INSTALLATION
The furnace can be hung from floor hoists or installed on suit-
able blocks or pad. Blocks or pad installations shall provide
adequate height to ensure the unit will not be subject to water
damage.
When suspending the furnace from rafters or floor joists using
rod, pipe or straps, refer to Physical Data, Table 3 on page 7,
for furnace weights to determine suitable means of suspen-
sion.
Do not install the unit on the rear panel.
FIGURE 5 :
Typical Attic Installation
RETURN AIR
SEDIMENT
TRAP
GAS PIPING
SUPPLY AIR
VENT (Maintain
required clearances
to combustibles)
SHEET METAL
IN FRONT OF
FURNACE
COMBUSTION AIR
OPENINGS IS
RECOMMENDED
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
When a furnace is installed in an attic or other insu-
lated space, keep all insulating materials at least 12"
away from furnace and burner combustion air open-
ings.
FIGURE 6 :
Typical Furnace Installation Using
Suspension Materials
1”MAX. BETWEEN
ROD & FURNACE
SUPPORT
ROD
6”MIN BETWEEN
ROD & FURNACE
1”MAX. BETWEEN
ROD & FURNACE
ANGLE IRON
BRACKET
