System Sensor D4120W Detector Freon you can wrap the monitored

you can wrap the monitored conductor through the center window multiple times to increase the effective amperage detected by the sensor

Universal Compatibility: Fully identical to the 40003916-521/U model

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

Direct Compatibility: Designed for an exact fit in York furnace parts assemblies

System Sensor D4120W Detector Freon you can wrap the monitoredThe 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