?oleman FL8-UH Installation Instruction - Warning
035-17405-000 Rev. B (0801)
12
Unitary Products Group
Bottom Return
Bottom return applications normally pull return air through a
base platform or return air plenum. Be sure the return plat-
form structure is suitable to support the weight of the furnace.
Refer to Figure 1 on page6, for unit dimensions and Table3
for unit weights. Be sure to seal the furnace to plenum con-
nection to prevent air leakage.
The bottom panel is equipped with a perforated opening for
easy removal. Tabs must be cut with sheet metal snips to
allow removing knock-out. Scribe marks are included for
forming flanges for attachment of the return air ductwork.
NOTE: If an external mounted filter rack is being used, see
the instructions provided with that accessory for proper hole
cut size.
Upflow attic installations must meet all minimum clearances
to combustibles and have floor support with required service
accessibility.
UPFLOW/HORIZONTAL MODELS
HORIZONTAL APPLICATION
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, refer to
the upflow application, “Bottom Return” section on page12,
of this manual.
NOTE: If an external mounted filter rack is being used, see
the instructions provided with that accessory for proper hole
cut size.
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. How-
ever, refer to “VENTING.” section on page8, and “Clear-
ances to Combustibles” section on page4, in this manual for
additional information.
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.
NOTE: See crawl space installation for suspending the fur-
nace in attic installations.
CRAWL SPACE INSTALLATION
The furnace can be hung from floor joists 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.
Do not install the unit on the rear panel.
WARNING
When a furnace is installed in an attic or other
insulated space, keep all insulating materials at
least 12" away from furnace and burner combus-
tion air openings.
FIGURE 6 : TYPICAL ATTIC INSTALLATION