This defrost controller is required when using a Kreyer defrost kit.
When using a Kreyer Fan unit for below freezing temperatures, you must also use their matching defrost kit. Kreyer Defrost Kits consist of an electric heating element or spiral and are fitted directly to their respective fan unit cooling fins. The Defrost Kit melts any iced condensate that can accumulate on the fins when the fan is used with Glycol-Water set below the freezing point. The Defrost Kit will periodically melt any iced condensate allowing you to use your fan unit at low temperatures.
For use with MR, SD-S, SD Plus, and TA Kreyer Fan Units.