A natural gas furnace usually requires what gas pressure at the manifold and burners?

Natural gas furnaces typically require a gas pressure of 3.5 inches of water column (W.C.) at the manifold and burners for optimal operation. This pressure level is necessary to ensure that the gas is delivered at a sufficient rate to produce the correct amount of heat while maintaining safety and efficiency.

The 3.5 in. W.C. pressure allows for proper combustion of the gas, ensuring that the furnace operates efficiently and effectively. If the pressure is too low, the burner may not function properly, leading to incomplete combustion and potentially dangerous conditions such as the production of carbon monoxide. Conversely, if the pressure is too high, it may cause excessive flame and can also lead to safety hazards.

Understanding the correct pressure settings is crucial for HVAC technicians to ensure that the equipment is functioning within the manufacturer's specifications and to promote longevity and reliability in heating systems.