The Frost Master® Defrost Controller by Hansen Technologies is an easy-to-use device designed to efficiently remove frost accumulation from evaporator coil surfaces. Utilizing reliable solid-state electronics and a precision quartz time clock, it sequentially operates through logical defrost steps—Pump Out, Hot Gas, Equalize, and Fan Delay—to ensure smooth and effective defrosting. The controller features SPDT relays with a 10-amp switch rating, facilitating flexible connections to solenoid valves and control relays. Defrost modes and step times are easily viewed through the clear cover of the NEMA 4 enclosure. Typically, one controller is used per defrost control valve group. The Frost Master® is suitable for various defrost applications, including top and bottom feed unit coolers, blast freezer evaporators, and ice makers, and is compatible with systems utilizing hot gas, electric, or water defrost methods.