Draft and combustion chamber pressure: how they affect burner adjustment

The pressure inside the combustion chamber and the chimney draft affect the actual amount of air passing through the burner.

Positive chamber pressure

The fan must overcome the resistance of the boiler and the flue gases.

Excessive draft

It can alter the actual air flow rate and affect flame stability.

Measurement

Chamber pressure or draft is measured with a suitable manometer at the points specified by the manufacturer.

Relationship with combustion

Final adjustment must be performed with the flue gas system in its actual operating state.