Trane SEN01518 Wired Zone Sensor Interface Set with 3-Speed Fan Control is a low-voltage control component designed for compatible Trane HVAC systems. It connects a wired zone sensor to the equipment controls, transmitting temperature and operating signals while providing three-speed fan control based on system requirements. Used with compatible air handlers, fan coil units, and heati... https://www.partshnc.com/trane-sen01518-wired-zone-sensor-interface-set-3-speed-fan-control