Siemens Combustion QRA2M(1) Detector R-407A it is not a substitute

it is not a substitute for a dedicated backflow preventer like the Watts 288A series

Reduced Mechanical Stress: Precision balancing prevents shaft run-out

these HVAC vent guards are essential for high-efficiency furnace maintenance and preventing costly system callbacks

maintaining circuit integrity even in high-vibration applications

this unit maintains consistent air quality while minimizing energy loss

Siemens Combustion QRA2M(1) Detector R-407A it is not a substituteThe Siemens QRA2M(1) is a high sensitivity ultraviolet flame detector engineered for supervising gas and oil flames in industrial and commercial burner systems. Utilizing an intermittent operating mode, this UV flame detector monitors radiation intensity during each half cycle to provide accurate signal current to Siemens burner controls for safety critical flame supervision and ignition spark proving. The QRA2M(1) features a robust, metalized plastic