Seasonal Shutdown Instructions

Caution

Note

Maintenance

Semi-Annually:Clean and disinfect fluid cooler with biocides. Systems with biofouling, high general bacterial counts, or positive cultures of legio- nella may require additional cleaning. Refer to “Fluid Cooler Cleaning” section—page 19. Consult your water treatment expert as to prudent biological evaluation testing.

Annually: Relubricate motor(s) according to the manufacturer’s instruc- tions.

Check the belt tension and condition.

Check to see that all bolts are tight in the fan and mechanical equipment region. Refer to Component User Manuals for torque values.

Inspect the fluid cooler thoroughly, making maximum use of instructions given in the separate user manuals. Check structural bolted connections and tighten as required. Make preventive maintenance repairs as neces- sary.

When the system is to be shut down for an extended period of time, it is recommended that the recirculation water system be drained. Leave the basin drains open.

Draining the coil is not recommended—draining promotes corro- sion inside the coil tubes. See protecting coil in Freezing weather on page 17.

During shutdown, clean the fluid cooler (see Warning, page 19) and make any necessary repairs. Eliminators and louvers are easily removed to gain access to the coil. Pay particular attention to mechanical equipment sup- ports and sheaves or coupling (or drive shafts).

Following each year’s shutdown and cleaning, inspect the fluid cooler’s metal surfaces for evidence of the need to apply a protective coating. Do not misinterpret grime as a need to have the tower painted. If relatively bright metal can be exposed by cleaning, consider that the galvanizing has remained effective. Unless there is evidence of a generalized failure of the galvanizing, localized touch-up should be all that is required.

To the extent that the galvanizing (zinc coating) still exists, paint will not adhere to it readily. Contact the manufacturer of the coating you

intend to use for instructions.	➠