AAON RN Series, Installation Operation & Maintenance, Page: 29 / 136

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Installation
AAON equipment has been designed for
quick and easy installation.
Locating Units
The curb must be mounted first and must be
located so that duct connections will be clear
of structural members of the building.
Verify rooftop or foundation can support the
total unit weight,
including accessory
weights.
Do not position flue opening to discharge into
a fresh air intake of any other piece of
equipment. Unit must also be installed so that
the flow of combustion intake air is not
obstructed from reaching the furnace.
Vent opening must not be blocked by snow.
A minimum 12” curb must be used or the
vent outlet shall be greater than 12” off the
ground/roof.
Flue gas is dangerously hot and contains
containments. The user is responsible for
determining if vent gases may degrade
building materials.
The National Gas and Propane Installation
Code, B149.1 specifies a 6 ft. horizontal vent
terminal clearance to gas and electric meters
and relief devices.
Local codes may supersede or further place
restrictions on vent termination locations.
Table 1 - A Cabinet Unit Clearances
Location
Unit Size
6-8 and 10 tons
Front -
(Controls Side)
48”
Back - (Outside
Air)
36”
*Left Side *6”
Right Side
48”
Top Unobstructed
*Units with a water-cooled condenser or
chilled water coil require 48” of clearance
on the left side for service access. DX and
no cooling air handling units with an
energy recovery wheel require 24” of
clearance on the left side for service access.
Table 2 - B Cabinet Unit Clearances
Location
Unit Size
9 and 11-15 tons
Front -
(Controls Side)
48”
Back - (Outside
Air)
48”
*Left Side *6”
Right Side
48”
Top Unobstructed
*Units with a water-cooled condenser or
chilled water coil require 48” of clearance
on the left side for service access. DX and
no cooling air handling units with an
energy recovery wheel require 24” of
clearance on the left side for service access.
When locating gas fired units, it is
recommended the unit be installed so
that the flue discharge vents are
located at least 120 inches away from
any
opening through which
combustion products could enter the
building.
WARNING
Distances from adjacent public
walkways, adjacent buildings ,
operable windows and building
openings, shall conform to local codes
and/or the National Fuel Gas Code,
ANSI
Z223.1/NFPA 54, or the
National Gas & Propane Code, CSA
B149.1
WARNING