Lennox 80M51 Auto Limit Switch 135°F-150°F

The Lennox 80M51 Auto Limit Switch is an auto protection device used in residential heat, ventilation, and air conditioning systems with furnaces. This is usually mounted inside the draft inducer housing, through which combustion gases are usually expelled out of the system. This switch works as temperature indicator of these flue gases in these cases. When the temperature goes high, normally between 135°F and 150°F, the limit switch turns off the furnace to avoid high temperature and possible damage. This essential safety feature is a better way of preventing software problems that may cause your HVAC system inefficiency.