AAON LZ Series, Installation Operation & Maintenance

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Lubrication
All original motors and bearings are
furnished with an original factory charge of
lubrication. Certain applications require
bearings be re-lubricated periodically. The
schedule will vary depending on operating
duty, temperature variations, or severe
atmospheric conditions.
Bearings should be re-lubricated at normal
operating temperatures, but not when
running.
Rotate the fan shaft by hand and add only
enough grease to purge the seals.
DO NOT
OVERLUBRICATE.
Air-Cooled Condenser
The air-cooled condenser section rejects heat
by passing outdoor air over the condenser
coils for cooling of the hot refrigerant gas
from the compressors. The heated air will
discharge from the top of the section through
the axial flow fans.
The condenser coils should be inspected
yearly to ensure unrestricted airflow. If the
installation has a large amount of airborne
dust or other material, the condenser coils
should be cleaned with a water spray in a
direction opposite to airflow. Care must be
taken to prevent damage to the coils.
E-Coated Coil Cleaning
Documented quarterly cleaning of e-coated
coils is required to maintain coating warranty
coverage. E-Coated Coil Maintenance
Record document is available on the AAON
website.
Surface loaded fibers or dirt should be
removed prior to water rinse to prevent
restriction of airflow. If unable to back wash
the side of the coil opposite of the coils
entering air side, then surface loaded fibers or
dirt should be removed with a vacuum
cleaner. If a vacuum cleaner is not available,
a
soft non-metallic bristle brush may be used.
In either case, the tool should be applied in
the direction of the fins. Coil surfaces can be
easily damaged (fin edges bent over) if the
tool is applied across the fins.
Use of a water stream, such as a garden hose,
against a surface loaded coil will drive the
fibers, dirt and salts into the coil. This will
make cleaning efforts more difficult. Surface
loaded fibers must be completely removed
prior to using low velocity clean water rinse.
Quarterly cleaning is required to maintain
warranty coverage and is essential to
maintain the life of an E-coated coil. Coil
cleaning shall be part of the unit's regularly
scheduled maintenance procedures.
Failure to clean an E-coated coil on the
prescribed quarterly cycle will void the
warranty and may result in reduced
efficiency and durability in the environment.
A routine two-step quarterly coil cleaning is
required to maintain warranty.
Step one is to clean the coil with the below
approved coil cleaner (see approved products
list under the "Recommended Coil Cleaners”
section.
Step two is to use the approved salt/chloride
remover under the "Recommended Chloride
Remover” section to dissolve soluble salts
and revitalize the unit. It is very important
when cleaning and/or rinsing not to exceed
130°F and potable water pressure is less than
Electric shock hazard. Shut off all
electrical power to the unit to avoid
shock hazard or injury from rotating
parts.
WARNING