While rated for 120V applications

and flame sense (S1/FC) align with your actual equipment layout

Simplified Professional Installation: Equipped with a factory-correct

The switch supports 120V-277V AC electrical loads and features 1/4" NPT high-pressure and 1/8" NPT low-pressure inlets for robust sampling line connections

voltage spikes

System Sensor 2151 Smoke Detector Els PW 17895 While rated for 120V applicationsThe System Sensor 2151 is a professional grade, low profile photoelectric smoke detector designed for precise performance in commercial HVAC and fire alarm systems. This 100 Series plug in head utilizes a state of the art optical sensing chamber and is engineered to provide stable detection in diverse environments. Technicians should note that this unit is the direct replacement for 2151+ and the 70 540000 001 models, ensuring seamless integration