System Sensor D4120W Detector Freon s 3-prong cord directly into

s 3-prong cord directly into the back of the thermostat

you would typically look for the NC/S versions or a 4-wire variant

System Compatibility: Explicitly designed for Williams Comfort Products furnace series requiring 3

Whether you are performing a scheduled overhaul or addressing a cracked housing on a Watts BKF55B

System Sensor D4120W Detector Freon s 3-prong cord directly intoThe System Sensor D4120W is a high performance 4 wire photoelectric duct smoke detector specifically engineered for harsh environments and outdoor rooftop HVAC installations. This air duct smoke detector features a NEMA 4 watertight enclosure, providing superior protection against windblown dust, rain, and splashing water. Utilizing integrated low flow technology, the unit operates efficiently in airflow speeds ranging from 100 to 4,000 feet per