Thermostat; Type 3-Wire, Dual Sensing Digital; Voltage Rating 24 Volt ACThis 3-wire thermostat offers system set-up capabilities with simple, easy-to-use menus. There is a reduced operating mode which may be used for nighttime and vacation periods. With the optional floor sensor this thermostat can regulate either the floor or the room temperature or both. In that case the floor sensor is used as a temperature limiter, either high or low limit. Additional features include pump exercise, ºF or ºC capabilities and air/floor priority.