The pilot gas flame is usually maintained by a small orifice or burner located near the main burner. A constant flow of gas, such as natural gas or propane, is supplied to this pilot burner to keep the flame burning. When the thermostat in the home calls for heat, the pilot gas flame ignites the main burner, which then begins to heat the air and distribute it throughout the house's ductwork.
Using a pilot gas flame offers several advantages:
1. Quick Ignition: The pilot gas flame is already lit and ready to ignite the main burner, ensuring a quick response when the furnace is turned on.
2. Reliability: The pilot gas flame is a dependable method of ignition, reducing the risk of ignition failure or delayed heating.
3. Safety: Modern furnaces are equipped with safety mechanisms that monitor the pilot gas flame. If the pilot gas flame goes out, the gas supply to the main burner is automatically shut off, preventing any gas leaks or potential hazards.
4. Continuous Burning: The pilot gas flame continuously burns, so it is always available to ignite the main burner when needed, even after extended periods of inactivity.
While the constant burning of the pilot gas flame does result in a small amount of gas consumption, the trade-off is the convenience of having instant ignition and reliable heating whenever required. Advances in furnace technology have led to improvements in pilot gas efficiency, making modern furnaces more energy-efficient compared to older models.
Overall, pilot gas plays a crucial role in ensuring the smooth and efficient operation of a furnace, providing a consistent and reliable ignition source for the main burner to deliver warm air throughout the home.
