As a critical safety component in HVACR heating systems

extending the service life in mechanical rooms

Built for the rigorous demands of Carrier

It serves as a fixed restriction to control the rate of air bleed or to establish a specific pressure drop

Nordyne 904574 Limit Switch As a critical safety componentThe Nordyne 904574 Limit Switch is a critical safety component designed for high limit temperature monitoring within gas fired furnaces. This 145F CO auto limit switch serves as a primary thermal watchdog, specifically engineered to open the electrical circuit at a fixed set point of 145 degrees Fahrenheit. By integrating a time delay relay, the 904574 ensures that the system responds accurately to abnormal heat rise and potential carbon monoxide