AAON LZ Series, Installation Operation & Maintenance

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Pipe Insulation
The water piping and components on units
with pumping packages are not insulated at
the factory. Insulation should be installed on
the water piping after the system has been
checked for leaks.
Installation
Outdoor Mechanical Room Placement
The AAON LZ Series is designed for outdoor
applications and can be mounted 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 chiller for
operational and service clearances.
Table 1 - Service Clearances
Location
Unit Size
45-540 tons
Left
96”
Right
Compressor End
72”
Chiller HXC End
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(s) 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,
and gas penetrations and workspace only. Do
not make openings larger than necessary. Set
the curb to coincide with the openings. Make
sure curb is level.
If an LZ with air-cooled condenser is
installed on a curb, use a curb cap for the
open area under the condenser section.
Unit specific curb drawing is included with
job submittal. See SMACNA
Architectural
Sheet Metal Manual for curb installation
details.
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
transmission from the unit to the building.
All roofing work should be performed
by competent roofing contractors to
avoid any possible leakage.
CAUTION