The 73K38 is a Direct Spark Ignitor (DSI)

offering a seamless crossover for technicians maintaining legacy systems

this specific model is designed for 18-30 VAC control circuits

Broad Application: Suitable for a variety of non-corrosive gas services

Common causes include a clogged furnace filter

System Sensor D4120W Detector Freon The 73K38 is a DirectThe 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