Important: Use this A421 Series Electronic Temperature Control only as an operating control. Where failure or malfunction of the A421 Series Control could lead to personal injury or property damage to the controlled equipment or other property, additional precautions must be designed into the control system. Incorporate and maintain other devices, such as supervisory or alarm systems or safety or limit controls, intended to warn of or protect against failure or malfunction of the A421 Series Control.
You can use the A421 equipped with cycle timer in agricultural and related applications where free-cooling and ventilation are necessary. See Table 1 for application information by control type.