and relays in high-efficiency rooftop units and chillers

this device is engineered to monitor furnace plenum temperatures and interrupt the electrical circuit if internal heat exceeds its 255°F set point

which allows the actuator to be swapped out without breaking the piping or exposing the technician to system fluids

the 621709R is built with high-grade laminations to minimize heat rise and vibration noise during high-demand cycles

KMC Controls STE-1412 Duct Sensor 30067439-890 and relays in high-efficiency rooftopThe KMC Controls STE 1412 is a high precision 12' copper averaging duct sensor designed for accurate temperature monitoring in large commercial air handling units and ductwork. Utilizing a 10,000 ohm Type III thermistor, this sensor provides reliable resistance data to BAS and HVAC controllers, ensuring optimal thermal management across the entire duct cross section. The bendable copper probe features a 5 16 inch O. D., allowing technicians to