The furnace burner is the heart of your central heating system. It’s the component that mixes air with natural gas and produces a clean-burning, high-temperature flame that generates heat for the whole house. A clean, intact furnace burner also ensures maximum fuel efficiency and low operating costs while minimizing the amount of combustion byproducts, including dangerous carbon monoxide. Here are some details about the process:
The Burner Cycle
In a typical gas-fired furnace, heating and burner operation are divided into several stages:
Signaling for Heat. When the household temperature drops below the thermostat setting, the furnace receives a signal to initiate heating from the system thermostat.
Fuel Delivery. The furnace fuel valve opens to start the flow of natural gas to the burner. At the same time, air from the furnace air intake blends with gas flow to provide the right mixture for clean, safe ignition and combustion.
Ignition. The mixture of natural gas and air is ignited at the burner. Ignition may be provided by a pilot light — a small flame that runs continuously — or, more commonly in newer furnaces, by an electric igniter that produces a spark.
Heat Transfer. Heat produced by the burner enclosed within the combustion chamber is added to the HVAC system's airflow by the heat exchanger. This vital component incorporates air passages to transfer heat efficiently to the airflow while sealing out dangerous gases.
Heated Air Circulation. Heated air is pulled into the ductwork by the system blower and distributed throughout the house and into each individual room through supply air vents.
Burner Shutdown. When household temperatures reach the desired setting, the thermostat sends a signal to shut off gas flow until temperatures drop again and the heating cycle repeats.
Furnace Burner Maintenance
Checking the burner is a critical part of annual furnace maintenance by a qualified HVAC contractor. The technician can verify proper burner operation by sampling and analyzing combustion gases. The burner in a gas furnace may require professional cleaning at intervals to support efficient and safe operation.
For more about furnace burner operation and annual professional furnace maintenance, contact Air Assurance.