Initial setting values for diffuser and air damper
The burner can be preset for first commissioning using the
scale values for setting the diffuser and the air damper.
The setting values are based on maximum combustion
chamber resistances in accordance with EN 303. The
settings need to be adjusted to suit the actual combustion
chamber resistance in order to optimise combustion.
Generally, CO
2
values between 12.0% and 13.0% are
achievable at the presetting stage. Presetting does not
replace the necessary flue gas measurements and
combustion optimisation.
Note Combustion heat rating is dependent on
nozzles used (see Ch. 4.7)!
5.3 Commissioning and setting
Diffuser setting X [mm]
Basic diffuser setting values
Combustion heat rating
Setting the diffuser
Indicating bolt
Setting screw
Setting the diffuser
The diffuser is set depending on the full load selected and
it is also valid for partial load.
Turn setting screw until scale shows the preset value at
indicating bolt.
Note When diffuser setting is 0 the setting scale is
flush with the housing (ie. scale is not visible).
Example diffuser setting WL10C/2-C, vers. Z
Firing rate (Q
F
) at 22 bar
full load pump pressure: 57·1 kW
This results in a diffuser setting of : 7·6
3·5
4·5
5·5
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