What is the main purpose of a combustion vacuum switch in gas furnaces?

The main purpose of a combustion vacuum switch in gas furnaces is to ensure proper venting. This device is crucial for safety and efficient operation. It monitors the venting system to confirm that the combustion gases are being expelled properly from the furnace to the outside atmosphere. If there is an obstruction or a failure in the venting process, the combustion vacuum switch will detect this and typically shut down the furnace to prevent dangerous situations such as the buildup of carbon monoxide inside the home.

This functionality is vital for maintaining indoor air quality and preventing potentially hazardous conditions. By ensuring that exhaust gases are properly vented, the combustion vacuum switch plays an essential role in the safe operation of gas furnaces.