22
maintenance
When water treatment chemicals are added, they should not be
introduced into the circulating water system via the water collec-
tion basin of the fluid cooler. Water velocities are lowest at that
point, which results in inadequate mixing. Ideal locations would be
in the redistribution basin above the coil, or in the riser pipe above
the discharge of the recirculating water pump(s).
Fluid Cooler Cleaning
Any evaporative-type fluid cooler must be thoroughly cleaned
on a regular basis to minimize the growth of bacteria, including
Legionella Pneumophila, to avoid the risk of sickness or death.
Service personnel must wear proper personal protective equip-
ment during decontamination. Do NOT attempt any service unless
the fan motor is locked out.
Operators of evaporative cooling equipment, such as closed circuit fluid cool-
ers, should follow maintenance programs which will reduce to an absolute
minimum the opportunity for bacteriological contamination. Public Health
Service officials have recommended that “good housekeeping” procedures
be followed, such as: regular inspections for concentrations of dirt, scale, and
algae; periodic flushing and cleaning; and the following of a complete water
treatment program including biocidal treatment.
The visual inspection should take place at least once a week during the
operating season. The periodic flushing and cleaning should be done before
and after each cooling season, but in any event at least twice a year. The
louvers, drift eliminators, easily accessible fill surfaces and the coil should
be flushed by use of a moderate-pressure water nozzle, being careful not to
cause physical damage. A reliable water treatment program should be installed
and maintained. Filtration devices may be employed to reduce the suspended
solids concentrations, thus increasing the effectiveness of the water treatment
program. See Fluid Cooler Startup instructions on page 12.
Coil Louver Removal:
The coil inlet louvers are comprised of a series of thermoformed PVC pack
assemblies, oriented to push water back into the fluid cooler. They are packed
tightly to ensure no water escapes from the air inlet.
Warning
Note