Chilled water is piped through the cooling coils of the units, and a fan forces air over the coils.
The condensate collection tray collects the moisture condensed out of the air. The condensate is generally piped to the bilge or a waste water drain system. It is important that the drain for the collection tray be kept clear. If the condensate cannot drain out of the tray, it collects and may promote the growth of harmful bacteria. When the condensate evaporates, it leaves impurities which rapidly lead to corrosion of the tray.