Evaporators are an ideal environment for bacteria and moulds. In the condensation water on the fins of your coolers microorganisms can grow and contaminate the passing air.
Within a few days a stable flora can grow on new evaporators. This flora can reproduce very well on cooling fins, also at low temperatures, and forms a slimy layer on the fins and in the drip pan called biofilm. Especially moulds and cold-loving organisms, like Listeria can multiply in evaporators.
By installing a UVC lamp in or in front of an evaporator it will remain clear of biofilm. It improves the hygiene of the evaporator and will prevent the the drip pan to become a microbiological swamp.
Air handling units can suffer from bacteria and moulds. The high humidity allows microorganisms to reproduce, they contaminate the air and reduce cooling capacity.
With installing UVC lamps in an air handling unit:
Ultraviolet is electromagnetic radiation, just outside that part of the light spectrum that is visible to the human eye.
The short-waved and energetic UVC radiation is absorbed by certain parts of the DNA which causes a photochemical change. This change affects the DNA and ensures that the microorganisms can not reproduce and die. UVC works an all microorganisms.