While the CT-DH-3 has many applications, it was primarily developed for use with CO2 equipment and exhaust/ventilation fans. The left side (or equipment) outlets of the controller are normally "ON" until defeated when the right side outlets are activated. Internal sensors will allow for 7F temperature zone and a 5% humidity differential between the time that the fans come "ON" and then turn "OFF" again. When temperature or humidity rises above your dial set points, the right outlets will activate and the left outlets will deactivate. The right side outlets will remain "ON" until the temperature drops 7 and/or the humidity drops 5% below your set points. At which time, the right outlets will shut "OFF" and reactivate the left outlets.

The CT-DH-3 operates on 120 Volt AC with 15 Amp maximum switching capacity and is intended for indoor use only. Be sure to locate your atmospheric controller where it will accurately sample and respond to the average air conditions. Good air circulation around the controller and in your garden space is essential. Avoid locating the controller in a draft or in direct sunlight.