AAON CL-230 - Manual (Page 20)

20
EVAPORATIVE-COOLED
CONDENSER cont.
MAINTENANCE RECOMMENDATIONS
Pump Maintenance:
• Cleaning - Remove oil, dust, water, and
chemicals from exterior of motor and pump.
Keep motor air inlet and outlet open. Blow out
interior of open motors with clean compressed
air at low pressure.
• Labeled Motors - It is imperative for repair of a
motor with Underwriters’ Laboratories label that
original clearances be held; that all plugs, screws,
other hardware be fastened securely, and that
parts replacements be exact duplicates or
approved equals. Violation of any of the above
invalidates Underwriters’ Label.
Fan Motor Maintenance:
Same as pump maintenance
Access Doors:
If scale deposits or water is found around the
access doors, adjust door for tightness. Adjust as
necessary until leaking stops when door is
closed.
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
make-up 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.