APPENDIX
Burner Performance Graph
All outputs quoted are based on nett CV
The performance graph shown above plots burner input against the appliance running resistance. The
appliance starting resistance is derived from a combination of the combustion chamber shape, volume,
start rate and flue conditions. It may be necessary to select a burner with a higher fan static pressure than
would normally be chosen, if the appliance has a high starting resistance.
Similarly, when firing a reverse pass boiler up to 2 MW, with a combustion intensity of 2MW/m
3
and an
operating resistance between 40 and 90mm wg, it is recommended that a burner with a higher fan static
pressure is selected, i.e. if the graph selects a burner with a 28cm fan then use the 34cm fan model for
correct combustion.
All outputs quoted are based on nett CV.
MOL 3400-4100 Issue 2 10/08
Page 32