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Semi-Annually: Check belt tension and condition. Adjust tensions as
necessary.
Clean and disinfect cooling tower with biocides. Systems with biofouling,
high general bacterial counts, or positive cultures of legionella may require
additional cleaning. Refer to “Cooling Tower Cleaning” section—page 20.
Consult your water treatment expert as to prudent biological evaluation
testing.
For those regions that require semi-annual ll removal and cleaning, remove
the ll through the ll access hatch (regional option) or the mechanical
access panel. Note the orientation and location of ll blocks. They must
return into the tower in the same location from which they were removed.
Failure to do so may result in diminished thermal capacity.
Annually: Inspect the tower thoroughly, making maximum use of instruc-
tions given in the separate user manuals. Check structural bolted con-
nections and tighten as required. Make preventive maintenance repairs
as necessary.
Lubricate motor according to the manufacturer’s instructions. Check to
see that all bolts are tight in the fan and mechanical equipment region,
including the fan cylinder and fan guard. Refer to Component User Manu-
als for torque values.
Inspect the spray system and nozzles for any blockage. Nozzles can be
removed from the grommet by pulling sharply down on the nozzles. To
replace the nozzles, wet the surface of the nozzle and grommet and push
nozzle back into place.
Seasonal Shutdown Instructions
When the system is to be shut down for an extended period of time, it is
recommended that the entire system (cooling tower, system piping, heat
exchangers, etc.) be drained. Leave the basin drains open.
During shutdown, clean the tower (see Warning, page 20) and make any
necessary repairs. Pay particular attention to mechanical equipment sup-
ports.
Following each year’s shutdown and cleaning, inspect the tower’s metal
surfaces for evidence of the need to apply a protective coating. Do not
misinterpret grime and transient rust from the piping system as a need to
have the tower painted. If relatively bright metal can be exposed by clean-
ing, consider that the galvanizing has remained effective. Unless there is
Maintenance