Coleman PxXU-V series Installation Instructions Manual page 10

DOWNFLOW / HORIZONTAL MODELS -
HORIZONTAL APPLICATION
Downflow furnaces may be installed horizontally with the sup-
ply airflow toward the left or right by laying the unit on the left
or right side panel.
Do not install the unit on the rear panel.
After determining the best orientation, lay the unit on top of
the shipping carton to protect the finish. The appropriate elec-
trical knock-outs for power wiring, control wiring and gas pip-
ing 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.
HORIZONTAL FILTERS
All filters and mounting provision must be field supplied. Fil-
ter(s) may be located in the duct system external to the fur-
nace or in a return filter grille(s). Refer to furnace accessories
on Page 30 for External Filter Kit options.
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. Refer to Figure 8.
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
Figure 8).
NOTE: The unit must be elevated to allow clearance to the
condensate trap and drain pipe. A minimum of 8" clearance is
required for this purpose.
If this furnace is installed over a finished space, a
condensate safety pan must be installed.
10
LINE CONTACT ONLY PERMISSIBLE
BETWEEN LINES FORMED BY THE
INTERSECTION OF FURNACE TOP
AND TWO SIDES AND BUILDING
JOISTS, STUDS OR FRAMING
GAS PIPING
RETURN AIR
SEDIMENT
TRAP
FIGURE 8 : Typical Attic Installation
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.
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 and,Table 3, "UNIT
CLEARANCES TO COMBUSTIBLES," on Page 6, for fur-
nace weights to determine suitable means of suspension.
Angle supports should be placed at the supply air end and
near the blower deck. (Refer to Figure 9.) Do not support at
return air end of unit.
Units may also be suspended by using straps or other mate-
rial at the same location. All four suspension points must be
level to ensure quiet furnace operation
035-17468-001 Rev. A (801)
SUPPLY AIR
VENT (Maintain
required clearances
to combustibles)
SHEET METAL
IN FRONT OF
FURNACE
COMBUSTION AIR
OPENINGS IS
RECOMMENDED
30" MIN.
WORK AREA
12"
Unitary Products Group