In addition to increased operating costs incurred as a result of dirty coils, evaporator coils (as well as chilled water coils) are placed in the building air stream. Thus, any contaminants on the coil or in the condensate pan beneath the coil may become airborne, affecting the quality of the air in the occupied spaces.
In addition to changing the filters and cleaning the evaporator coil, care should be taken to ensure there is no growth of bacteria, mold, or fungus in the condensate pan. Condensate pans, because of the incidence of standing water, are prone to this growth. Maintenance procedures should include routine cleaning of the condensate pan and drain, and treatment, if necessary, with an antimicrobial agent. Pan treatments are available in tablet form for ease of application.
Legionellosis, commonly known as Legionnaire’s Disease, has been found in evaporator and chilled water condensate pans. This disease, which can be fatal to those with impaired respiratory function, is a concern of all building owners and engineers. Further information on the source and prevention of this serious problem can be obtained from ASHRAE.
Next, we'll discuss coil cleaning procedures.
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