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4.8
Combustion head adjustment
Installation operations are now at the stage where the blast tube
and sleeve are secured to the boiler as shown in Fig. 16.
It is now a very simple matter to set up the combustion head, as
this depends solely on the MAX output developed by the burner.
It is therefore essential to establish this value before proceeding
to set up the combustion head.
There are two adjustments to make on the head:
• air delivery R1;
• gas delivery R2.
In diagram (Fig. 17) find the notch to use for adjusting the air and
the gas, and then proceed as follows:
Air adjustment
Turn screw 4)(Fig. 16) until the notch identified is aligned with the
front surface 5)(Fig. 16) of the flange.
NOTE:
in order to facilitate adjustment, loosen screw 6)(Fig. 16), ad-
just and then tighten.
Gas adjustment
Loosen the 3 screws 1)(Fig. 16) and turn ring 2)(Fig. 16) until the
notch identified is aligned with index 3)(Fig. 16).
Tighten the 3 screws 1)(Fig. 16) fully down.
No. notches
20194185
Installation
Example:
RS 68 BLU, burner output = 500 kW.
If we consult diagram (Fig. 17) we find that for this output the ad-
justments are:
•
air: R1 = notch 6;
•
gas: R2 = notch 2.
NOTE:
Diagram (Fig. 17) indicates an optimal regulation for a type
of boiler seen in "Commercial boilers" on page 10.
If the pressure of gas allows it, by closing ring nut 2)(Fig. 16) a
reduction of the formation of NOx is obtained.
Continuing with the previous example, paragraph "Gas pressure"
on page 20 indicates that for burner RS 68 BLU with output of
500 kW a pressure of approximately 5.0 mbar is necessary at test
point 6)(Fig. 16). If this pressure cannot be reached, open the
ring 2)(Fig. 16) to notch 4 or 5.
Make sure that the combustion characteristics are satisfactory
and free of pulsations.
WARNING
D1256
Burner output in 2nd stage
18
GB
The adjustments indicated can be modified during
the initial start-up.
D2381
Fig. 16
Fig. 17
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