A 66-month corrosion warranty protects the company’s QTC3 air-cooled scroll chillers, in sizes from 50 to 200 tons, when they are ordered with Environment Guard microchannel coil-corrosion protection. The coatings are seawater acetic-acid tested (SWAAT) and provide corrosion protection up to twice as long as uncoated heat exchangers. The optional basic coating provides coil surface treatment and is recommended for applications within five miles of the seacoast where additional corrosive factors such as agricultural or industrial corrosives exist. The optional premium coating involves an epoxy-coating process that doubles the time when corrosion otherwise appears on uncoated coils. The premium coating is suitable for installations exposed to direct saltwater spray contact as well as those within five miles of the seacoast where additional corrosive conditions exist.