the internal bimetal disc is likely fatigued or damaged

this model is rated for both air conditioning and heat pump duty

is designed with a black jacket and red stripe to ensure rapid pneumatic circuit identification during multi-line installations

F up to 400

the internal link interrupts the electrical circuit to protect high-value components from thermal damage

System Sensor B114LP Detector Els PW 17895 the internal bimetal disc isSystem Sensor B114LP Gas Smoke Detection, 120Vac Nominal Voltage, 4 Wire, Ceiling Mounted, Smoke Detector Adapter Base with SPST NO and SPDT relay contacts and a 470 ohm current limiting resistor for 2151 Special Applications Duct Smoke Detector