AAON LZ Series, Installation Operation & Maintenance

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Bearings - Lubrication
Every 6 months or after a prolonged shut
down. Use waterproof, lithium based grease.
Below 32°F - Esso Exxon or Beacon 325.
Above 32°F - Mobil Mobilox EP2, Shell
Alvania EP2, or Texaco RB2.
Recommended Monthly Inspection
1. Clean sump section interior. Dirt and
other impurities which have accumulated
in the sump should be removed from the
sump area. Shut off makeup water ball
valve and open the drain connection for
flushing of the sump.
2.
Clean dirt out of sump using a water hose
(not a pressure washer).
3.
Clean sump suction strainer.
4.
Check water operating level. Adjust float
as required.
5.
Inspect fan motor(s) and water circulation
pump(s) and lubricate per the lubrication
nameplate
or manufacture’s
recommendations.
6.
Inspect axial fans and eliminators
removing any debris which may have
accumulated during operation.
7.
Inspect the water distribution system to
insure that nozzles and spray orifices are
functioning correctly. The inspection
should be made with the circulation pump
on and fans off.
Mist Eliminators
The mist eliminators must be correctly
positioned when they are replaced during
cleaning or service.
Air Inlet
Inspect the air inlet louvers and mist
eliminators into the condenser section on a
monthly basis to remove any paper, leaves or
other debris that may block the airflow.
Stainless Steel Base Pan
The base pan under the tube bundles is
stainless steel and may sometimes become
tarnished due to contamination. These
surfaces should be inspected yearly to ensure
they remain clean of any contamination that
may result in damage. Any surfaces that
show contamination should be cleaned
ONLY with a commercial stainless steel
cleaner to restore the initial appearance.
Propeller Fans and Motors
The fans are directly mounted on the motor
shafts and the assemblies require minimal
maintenance except to assurance they are
clear of dirt or debris that would impede the
airflow.
Recommended Annual Inspection
In addition to the above maintenance
activities, a general inspection of the unit
surface should be completed at least once a
year. Remove spray header and flush out.
Cleaning
Mechanical cleaning, including pressure
washing, should never be performed as
surfaces and seals could be damaged.
Chemical cleaning that is safe for stainless
steel, copper, aluminum, ABS plastic and
PVC is the only acceptable means of cleaning
the evaporative condenser. A proper water
treatment program should reduce cleaning
needs.