it must be manually depressed to close the circuit again

the thermal limit has failed and the switch must be replaced

and various HFC/HFO blends

It is specifically engineered to handle the viscosity of various product mixes while preventing leaks at the motor interface

consolidating truck stock for multiple D and E series units

System Sensor D4S Detector Sensor 30067439-890 it must be manually depressedThe System Sensor D4S is a 4 wire photoelectric duct smoke detector sensor component designed specifically for integration with the D4120 duct smoke detector housing. Engineered for high performance HVAC smoke detection, this replacement sensor head utilizes an advanced optical sensing chamber to detect combustion particles across a wide range of airflow speeds. It is optimized for low flow duct smoke detection, maintaining reliable operation in