Maintenance

or worn out components. Use of high-pressure water may damage the eliminator and louver material.

Observe operation of the float valve. Depress the operating lever to make sure that the valve is operating freely. Inspect the suction screen for plug- ging. Remove any debris that may have accumulated.

Check for any buildup of silt on the floor of the cold water basin. Mentally make note of the amount, if any, so future inspections will enable you to determine the rate at which it is forming.

Every 3 months: Lubricate fan shaft bearings. While rotating equipment by hand, grease the bearings until a bead forms around the seals—a maximum charge of 0.55 ounces is recommended. Chevron SRI-2 grease is recommended.

Every 6 months: Check belt tension and condition.

Check makeup float valve seals—replace as required.

If equipped with inlet flow control valve, grease valve stem guide—fully open and close—return to original position and lock.

Clean and disinfect cooling tower with biocides. Systems with biofoul-

ing, high general bacterial counts, or positive cultures of legionella may require additional cleaning. Refer to Cooling Tower Cleaning section

on page 19 Consult your water treatment expert as to prudent biological evaluation testing.

If basin silt level is significant, drain the basin and clean it out. Refer to Cooling Tower Cleaning section on page 19.

Annually: Relubricate motor. Refer to motor manufacturer’s recommenda- tions. Remove grease fill and relief plugs from front of motor and remove hardened grease with a wire or similar item, Add grease until grease is forced out at relief hole. Replace fill plug, run 1⁄2 to 1 hour and replace relief plug.

Check to see that all bolts are tight in the fan and mechanical equipment region, including the fan cylinder and fan guard. Use torque settings pre- scribed in the fan manual.

Inspect the tower thoroughly, making maximum use of instructions given in the separate service manuals. Check structural bolted connections and tighten as required. Make preventive maintenance repairs as necessary.