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it is professional best practice to also test or replace the defrost thermostat (sensor)
this specific model is Direct Acting (DA)
ensuring a secure connection to the thermocouple or thermopile and the 1/4 inch pilot tubing
this part is essential for securing the graphite or PTFE packing set
Siemens Building Technology QAC3171 Sensor 320788-702 it is professional best practiceThe Siemens QAC3171 is a professional grade active outdoor temperature sensor designed for high performance environmental monitoring in commercial HVAC and building automation systems. Engineered with a Pt1000 sensing element, this unit provides high measurement stability and linear signal transmission. It features a versatile 4 20mA output signal, making it compatible with a wide range of controllers for applications like outdoor air reset, chiller