Release and Absorption of Energy

A typical pipework layout, with controls, for a gas-fired atmospheric burner attached to a domestic boiler is shown in figure 4.1. An atmospheric burner is one in which the air for combustion is naturally aspirated and the pressure inside the boiler combustion chamber is just below atmospheric. The inclusion of a draught diverter in the flueway just above the boiler ensures that any change in the draught pressure which may occur will not materially alter the pressure inside the boiler combustion chamber, or (in the case of an increase in pressure) extinguish the main flame and/or the pilot light.