AAON RK-60 - Manual (Page 7)

7
INSTALLATION continued
AAON Rooftop units are designed for fast, easy installa-
tion. The curb is mounted first and must be located so
that duct connections will be clear of structural mem-
bers of the building.
SETTING THE CURB
When using the factory curb, make openings in roof
decking large enough to allow for duct penetrations and
workspace only. Do not make openings larger than
necessary. Set the curb to coincide with the openings.
Make sure the curb is level.
SETTING THE UNIT
If cables or chains are used to hoist the unit they must be
the same length and care should be taken to prevent
damage to the cabinet / coils or condenser fans.
It is recommended lifting the unit with the outside air
hood in the downward shipping position, however the
unit may be lifted with the outside air hood in the open
position.
Before lifting unit, be sure that all shipping material has
been removed from unit. Secure hooks and cables at all
lifting points / lugs provided on the unit.
Hoist unit to a point directly above the curb and duct
openings. Lower unit while guiding the unit to align with
utility opening and duct openings. Be sure that the
gasket material has been applied to curb. Continue low-
ering the unit until the unit skirt fits around the curb.
Make sure the unit is properly seated on the curb and is
level.
LIFTING DETAIL
TYPICAL FOR
2 - 25 TON UNITS
99" minimum
length
LIFTING DETAIL
TYPICAL FOR
26 - 60 TON UNITS
180" minimum
length
Where the supply or warm air duct passes
through a combustible roof, a clearance
of one inch must be maintained between
the outside edges of the duct and
combustible material in accordance
with National Fire Protection Association
Standard No. 90A. Provide flashings or
enclosure between structure and roof
and all joints must be sealed with mastic
roofing to ensure a watertight seal.
All roofing work should be performed by
competent roofing contractors to avoid
any possible leakage.
▲
! CAUTION
Improper installation, adjustment,
alteration, service or maintenance can
cause property damage, personal injury
or loss of life. Installation and service must
be performed by a qualified installer,
service agency or the gas supplier.
Install the gas fired unit to assure the flow
of combustion and ventilating air is not
obstructed from reaching the heater and
that the flue outlet is located at least
120 inches away from any opening
through which combustion products
could enter the building.
▲
! WARNING
The unit shall be installed so that the rectangular flue (if
applicable) is located at least 120" away from any open-
ing through which combustion products could enter the
building. The unit shall also be installed so that the flow
of combustion and ventilating air is not obstructed from
reaching the furnace. Do not position flue opening to
discharge into a fresh air intake of any other piece of
equipment.