This replacement HVAC limit switch ensures the system remains within factory-specified operating parameters

maintaining stable performance across varying flow rates

acting as the logic center for the G terminal and ensuring the blower provides proper airflow for heat dissipation or cooling efficiency

Always check for proper airflow before replacing the switch

Can this be used with modern refrigerants

Field Controls 01170006 Safety Switch 30067439-890 This replacement HVAC limit switchInstall the Field Controls 01170006 (Model FTS 6) to ensure reliable flue gas spillage detection on high capacity gas furnaces and boilers. This 180 degree manual reset thermal safety switch is engineered to de energize the burner circuit when it senses dangerous heat from blocked flues, downdrafts, or inadequate draft conditions. Operating as a normally closed switch, it provides critical protection for equipment rated over 400,000 BTU hr. The FTS 6