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maintenance
When water treatment chemicals are added, they should not be
introduced into the circulating water system via the cold water ba-
sin of the cooling tower. Water velocities are lowest at that point,
which results in inadequate mixing.
Cooling Tower Inspection and Maintenance
Microorganisms including Legionella bacteria can exist in premise
plumbing including cooling towers. The development of an effective
water management plan (WMP) and implementation of maintenance
procedures are essential to prevent the presence, dissemination and
amplification of Legionella bacteria and other waterborne contami-
nants throughout premise plumbing. Before operating the cooling
tower, the water management plan and maintenance procedures
must be in place and regularly practiced.
In addition, the following steps are recommended:
Do NOT attempt any service unless the fan motor is locked out.
• Consult a knowledgeable water treatment professional to clean and treat
your cooling tower. See Tower Startup section of this manual.
• Cooling towers must be cleaned and disinfected regularly in accordance
with ASHRAE Standard 188 and Guideline 12.
• Workers performing decontamination procedures must wear personal
protective equipment (PPE) as directed by their facility safety officer.
• Cooling towers must be visually inspected regularly to assess signs of
bacterial growth, appearance of debris and scale on drift eliminators
and general operating conditions. Refer to ASHRAE Standard 188 and
Guideline 12 for specific frequency recommendations.
• Replace worn or damaged components.
To minimize the presence of waterborne microorganisms, including Legionella,
follow the water management plan for your facility, perform regularly scheduled
cooling tower inspections and maintenance, and enlist the services of water
treatment professionals.
For additional technical support, contact your Marley sales representative.
References:
ashrae.org. Search “ASHRAE Standard 188” and “ASHRAE Guideline 12.”
cdc.gov. Search “Water Management Program.”
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