XL EVAPORATIVE COOLING PRODUCTS
MAINTENANCE
S140-600 IOM (NOV 07)
Page 15
FANS
The fans should be checked monthly for any debris caught
in the blades. Any foreign material that has accumulated be-
tween the blades should be removed to prevent air capacity
reduction or an imbalance, resulting in excessive vibration.
CASING FINISH
The casing fi nish should be checked annually for corrosion
that may have occurred due to the alternating wet and dry
conditions. Any area that has corroded should be thoroughly
cleaned and retouched with a zinc-rich compound.
DISCHARGE CLOSURE DAMPERS/CAPACITY
CONTROL DAMPERS/LINKAGES
Under normal operating conditions, all bearings and other
working joints must be lubricated every three months with a
water-resistant grease which is rated for satisfactory perfor-
mance at an ambient temperature range of -65°F to 250°F.
All linkages should also be inspected monthly to ensure
proper adjustment and fl exibility. All linkage ball joints should
be lubricated every three months with the same grease
mentioned above.
ELECTRIC PAN WATER LEVEL CONTROL PACKAGES
Inspect Stilling Chamber for obstructions every three
months.
OPERATION AND MAINTENANCE
INITIAL AND SEASONAL START-UP
Before initial start-up or after a long shutdown period, the unit
should be thoroughly inspected and cleaned. The start-up
sequence should be:
1. Clean any debris from guards, fans, eliminators, heat
transfer sections, and cold water sump.
2. Flush the cold water sump (with strainers in place) and
drain to remove accumulated dirt.
3. Remove, clean, and replace sump strainers.
4. Turn the fan(s) by hand to ensure rotation without
obstruction.
5. Check and, if necessary, adjust the fan belt tension.
6. Prior to seasonal start-up, lubricate the fan shaft and motor
bearings. The ball bearings are factory lubricated, but should
be relubricated if the unit has been sitting on site for more
than a year before start-up.
7. On units furnished with discharge closure dampers and/or
capacity control dampers, lubricate all bearings and other
working joints and ensure proper linkage operation.
8. Check fl oat-operated makeup valve to be sure it is operat-
ing freely.
9. Fill cold water sump with fresh water to the overfl ow
level.
10. Adjust the fl oat on the makeup valve to shut off the
valve when the fl oat is approximately 1.0" to 1.5" below the
centerline of the overfl ow.
11. Start spray pump and check for the proper rotation as
indicated by sticker on pump motor. On “Remote” installations
where the unit pump was not furnished by the factory, a globe
valve should be installed in the pump discharge line and the
pump fl ow rate adjusted to the correct water fl ow.
12. Inspect spray nozzles and heat transfer section.
13. Check the locking collar on each fan shaft bearing and
tighten if necessary.
14. Start the fan(s) and check for proper rotation as indicated
by sticker on unit.
15. Check the voltage and current of all three legs of the fan
and pump motors. The current should not exceed the rated
service factor. After prolonged shutdowns, the motor insula-
tion should be checked with a Megger Insulation Tester prior
to restarting the motors.
16. Open the bleed line valve and adjust bleed to the recom-
mended rate.
17. On units furnished with electric water level control packag-
es, ensure that the stilling chamber is free of obstructions.
AFTER 24 HOURS
After 24 hours of operation under load, the following services
should be performed:
1. Check unit for any unusual noise or vibration.
2. Check the operating water level in the cold water sump.
Adjust if necessary.
3. Readjust fan belt tension if required.
4. Inspect spray nozzles and heat transfer section.
OPERATION
During operation, the unit should be inspected, cleaned and
lubricated on a regular basis. The required services and
recommended frequency for each are summarized in the
Operation and Maintenance Schedule in this manual.
SEASONAL SHUTDOWN
The following services should be performed when the unit is
to be shutdown for a prolonged period:
1. Drain the cold water sump and all piping that will be ex-
posed to freezing temperatures.
2. Clean and fl ush the cold water sump with sump strainer
in place. Leave the drain open so rain and melting snow will
drain from the unit.
3. Clean the sump strainers and reinstall.
4. Lubricate the fan shaft and motor bearings, motor base
and motor base adjusting screws.
5. Close shut-off valve in water make-up line and drain all
exposed make-up piping.
6. Inspect the protective fi nish on the unit. Clean and refi nish
as required.
7. On units furnished with discharge closure dampers and/or
capacity control dampers, lubricate all bearings and other
working joints.
8. On units equipped with electric water level control pack-
ages, inspect stilling chamber to ensure it is free of any
obstructions.
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