Danfoss, Baltimore, Maryland, introduces the AK-RC 251 Optyma Control electronic controller. The AK-RC 251 Optyma Control can control compressors, solenoids, fans, lights, crankcase heaters, and up to two defrosts. It features a weatherproof enclosure and is compatible with standard 3/4-inch fittings. The control comes kitted with two NTC sensors: a five-foot sensor and a 10-foot sensor. It can be used in both new and existing walk-in freezer and cooler installations.