regulating the CFM output and ensuring the blower motor initiates and terminates based on temperature limit inputs and thermostat signals

The unit provides critical safety interlocks

As a vacuum-actuated sensing device

The field-selectable output provides maximum flexibility for integration

Siemens Building Technology QAA2212.FWNN Sensor 319852-301 regulating the CFM output andThe Siemens Building Technology QAA2212. FWNN is a professional grade room temperature sensor designed for high precision building automation. Built with a 1k Ohm Platinum RTD (385 Alpha) sensing element, this unit delivers exceptional accuracy of + 0. 54F at 32F, ensuring stable environmental control in commercial offices, classrooms, and industrial facilities. This model features a full LCD display for real time monitoring and an integrated setpoint