and mixed gas systems

this switch is rated for dual voltage applications up to 250V

For technicians servicing DGAM

replacing the Weil McLain burner gasket is a standard best practice to avoid callbacks

reusing a worn gasket risks gas leaks and "rumbling" combustion due to air infiltration

Carrier HH18HA499 Limit Switch and mixed gas systemsThe Carrier HH18HA499 Limit Switch is a critical high temperature safety component engineered for Carrier, Bryant, and Payne gas furnaces. This automatic reset limit switch is designed to open the electrical circuit when internal plenum temperatures reach the 165F threshold and closes once temperatures normalize to 125F. It serves as a direct replacement for the HH18HA499A model, ensuring field compatibility and maintaining the original safety circuit