What impact does increasing a furnace's gas pressure typically have?

Increasing a furnace's gas pressure typically affects the combustion process, specifically enhancing the mixture of gas and air that reaches the burner. When gas pressure is increased, the velocity of the gas flowing into the burner increases, leading to a more vigorous flame.

In a scenario where the gas pressure is optimal, increasing it further can increase flame temperature because more fuel is being introduced into the combustion chamber, resulting in a more intense and hotter flame. This intense combustion can lead to improved efficiency and better heat output from the furnace.

However, if the provided answer indicates that increasing gas pressure decreases flame temperature, it's important to note that this contradicts the fundamental principles of combustion in gas appliances. Properly adjusted gas pressure is critical for maintaining efficient operation and preventing incomplete combustion, which can produce cooler flames due to insufficient fuel-to-air mixing.

Understanding this relationship between gas pressure, flame temperature, and combustion efficiency is crucial for the safe and effective operation of HVAC systems.