Fan-coil unit coolers use chilled water for the air conditioning of spaces. These assemblies are

Figure 17-9.-Centrifugal chilled water air-conditioning plant.

known as spot coolers. Chilled water is piped through the cooling coils of the units, and a fan forces air over the coils. One type of fan-coil assembly is shown in figure 17-10. Note the chilled water connections, the vent cock at the top, and

Figure 17-10.-Fan-coil unit cooler.

the condensate collection tray at the bottom of the unit.

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.