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Siemens Building Technology QAA2280.FWSC Sensor 320720-756 18" WC Actuation: Ensures theThe Siemens Building Technology QAA2280. FWSC is a high performance room temperature sensor designed for precise environmental control in commercial HVAC applications. This full feature HMI unit is engineered specifically for Siemens Terminal Equipment Controllers (TEC), including BACnet TEC, ATEC, and PTEC models. It features a digital LCD display for real time monitoring and a simplified RJ 11 connection that facilitates rapid, error free wiring