AAON CN-140 - Manual (Page 15)

15
Installation
Unit Placement
The AAON CN Series is designed for
outdoor applications and mounting at
ground level or on a rooftop. It must be
placed on a level and solid foundation that
has been prepared to support its weight.
The placement relative to the building air
intakes and other structures must be
carefully selected. Be sure to observe the
dimensions that are on the rating plate of the
condensing unit for operational and service
clearances.
Table 1 - Service Clearances
Location
Unit Size
55-140 tons
Front -
(Controls Side)
72”
Back 48”
Ends 96”
Top Unobstructed
Condenser coils and fans must be free of any
obstructions in order to start and operate
properly with a correct amount of airflow.
For proper unit operation, the immediate
area around condenser must remain free of
debris that may be drawn in and obstruct
airflow in the condensing section.
Consideration must be given to obstruction
caused by snow accumulation when placing
the unit.
Curb and Steel Mount Installation
Make openings in the roof decking large
enough to allow for water piping, electrical
penetrations, and workspace only. Do not
make openings larger than necessary. Set the
curb to coincide with the openings. Make
sure curb is level.
Unit specific curb drawing is included with
job submittal. See SMACNA Architectural
Sheet Metal Manual for curb installation
details.
Units require rail support along all four sides
of the unit base.
When installed at ground level, a one-piece
concrete slab should be used with footings
that extend below the frost line. Care must
also be taken to protect the coil and fins
from damage due to vandalism or other
causes.
If unit is elevated a field supplied catwalk is
recommended to allow access to unit service
doors.
This unit ships with a curb gasket that is
1¼” wide and 1½” tall. It is recommended
that this or another similar gasket be used
between the curb and the unit to reduce
vibration from the unit to the building.
All roofing work should be performed
by competent roofing contractors to
avoid any possible leakage.
CAUTION
The base beneath the condenser
section is open and must be
considered when mounting on a curb.
CAUTION