coils, 3- to 5-ton as well as 15- to 25-ton. The microchannel evaporator coil is only available on the new 3- to 5-ton units. And 15- to 25-ton units use copper tube/aluminum fin evaporator coils. Color-coded, numbered wiring Faster identification of wires helps save time and money when servicing and diagnosing the unit.