Enumeration to configure the coil
type Coil = enumeration(ElectricHeating "Modulating electric heating coil", EvaporatorMultiStage "Evaporator coil with multi-stage compressor", EvaporatorVariableSpeed "Evaporator coil with variable speed compressor", None "No coil", WaterBasedCooling "Chilled water coil", WaterBasedHeating "Hot water coil");