IM 861
9
4
Locate unit where operating sounds will not disturb
owner or
neighbors.
5
Locate unit so roof runoff water does not pour directly on
the unit. Provide gutter or other shielding at roof level.
Do not locate unit in an area where excessive snow
drifting may occur or accumulate.
6
Where snowfall is anticipated, the height of the unit
above the ground level must be considered. Mount unit
high enough to be above anticipated maximum area
snowfall and to allow combustion air to enter the
combustion air inlet.
7
Select an area which will keep the areas of the vent, air
intake, and A/C condenser fins free and clear of
obstructions such as weeds, shrubs, vines, snow, etc.
Inform the user accordingly.
Attaching Exhaust and Combustion Air Inlet
Hoods
IMPORTANT:
Do not operate this unit without the exhaust/combus-
tion air inlet hood properly installed. This hood is shipped in a carton
in the blower compartment inside the unit and must be attached
when the unit is installed. See Figure 3.
To attach exhaust/combustion air inlet hood:
1
Remove screws securing blower access panel and remove
access panel. For location of blower access panel, see Figure
2.
2
Remove exhaust/combustion air inlet hood from the carton,
located inside the blower compartment.
3
Attach blower access panel.
4
Attach the combustion air inlet/exhaust hood with screws.
Reference Figure 3 for proper location. Screws are in carton
with the hood.
5
Vent the unit using the flue exhaust hood, as supplied from
the factory, without alteration or addition. The only
exception is with factory approved additions. Consult your
local utility or other authority having jurisdiction for
accepted venting techniques.
Cover Panel Installation/Conversion Procedure
Downflow to Horizontal
1
Remove the screws and covers from the outside of the
supply and return sections.
2
Install the covers in the bottom supply and return
openings with the painted side up. See Figure 6. Use the
existing gasket to seal the covers.
3
Secure the supply cover to the base of the unit with 1
screw, engaging prepunched tab in unit base.
4
Secure the return cover to the base of the unit with screws
engaging prepunched holes in the unit base.
Filters
This unit is provided with 4 - 16” X 16” X 2” disposable
filters. When replacing filters, ensure they are inserted fully to
the back to prevent bypass.
Clearances
The following minimum clearances must be observed for
proper unit performance and serviceability. Reference Figure 7.
NOTE:
Supply duct may be installed with “0” inch clearance to
combustible materials, providing 1
ⴖ
minimum Fiberglass
insulation is applied either inside or on the outside of duct.
Recommended
Clearance
Location
48
ⴖ
A - Front
18
ⴖ
B - Condenser Coil
12
ⴖ
*
C - Duct Side
36
ⴖ
D - Evaporator End
60
ⴖ
E - Above
*Without Economizer. 57 With Economizer
Figure 6: Cover gasket detail for units shipped for
downflow application being converted to horizontal.
I631
Figure 7: Clearances
I297
