Before Start-up
Among other sources, outbreaks of Legionnaires’ disease have re- portedly been traced to cooling towers. Maintenance procedures that prevent amplification and dissemination of Legionella and other airborne bacteria should be formulated and implemented BEFORE systems are operated and continued reqularly thereafter to avoid the risk of sickness or death
CLEANING–New installations should be cleaned and treated with biocides by a water treatment expert before startup. Remove any dirt and trash which has accumulated in the cold water basin. Remove any sediment from the cold water collection basin, sump, and screens. Use a water hose to flush cold water collection basins.
OPERATE WATER SYSTEM–Start the circulating water pumps. Increase the flow of circulating water gradually to match design water flow rate. Circulate water over the cooling tower continuously for several days before starting the mechanical equipment and placing the cooling tower into continuous operation.
When starting in cold weather, follow procedures outlined in Cold Weather Operation.
INSPECTION–It is imperative that all operating assemblies be inspected before they are placed in operation. The following is a list of components to be checked before starting the tower:
1–Check drive shaft alignment. Realign if necessary. See Marley Drive Shaft Service Manual.
2– Check tightness of bolts in fan cylinder joints.
3–Check tightness of the following bolted joints in the fan and drive as- semblies:
a–Fan hub clamp bolts. See Marley Fan User Manual for correct torque setting).
b–Fan hub cover bolts.
c–Geareducer®and motor mounting bolts. d—Drive shaft coupling and guard bolts.
4–Check Geareducer oil for sludge or water by draining off and testing a sample as outlined in the Geareducer User Manual. Check Geareducer oil level at “oil level” mark on the side of the case. Add oil as required.
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