Seasonal Shutdown Instructions

Maintenance

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.

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 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.

Tower framework: Check structural bolted connections and tighten as required.

Fans: Check fan assembly bolting and tighten as required. Use torque settings prescribed in the fan manual.

Fiberglass Components: Check all fiberglass parts for exposed glass fibers. If found, the affected surfaces should be recoated using a two- part polyamide epoxy primer to promote adhesion and a two-part acrylic polyurethane enamel for the topcoat.

Fan shaft bearings: Lubricate fan shaft bearings at close of each operat- ing season—see page 24.

Electric motors: Clean and lubricate motor at close of each operating season (refer to motor manufacturer’s recommendations.) Check motor anchor bolts and tighten as required.

Do not start motor before determining that there will be no interfer- ence with free rotation of the fan drive.

The motor should be operated for three hours at least once a month. This serves to dry out windings and re-lubricate bearing surfaces—refer to Marley Electric Motor User Manual 92-1475.

At start of new operating season, make sure bearings are adequately