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4.7
Adjustment of the combustion head
At this point of the installation, the combustion head is fixed to the
boiler as shown in Fig. 12.
It is therefore especially easy to adjust, and this adjustment de-
pends only on the maximum output of the burner.
Two adjustments of the head are foreseen:
air adjustment
gas adjustment
In the diagram of Fig. 15, find the notch at which to adjust both air
and central gas/air.
4.7.1
Air adjustment
Turn screw 4)(Fig. 16) until the notch identified is aligned with the
front surface 5)(Fig. 16) of the flange.
To facilitate adjustment, loosen the screw 3)
(Fig. 16), adjust and then lock.
CAUTION
4.7.2
Gas adjustment
Loosen the 3 screws 1)(Fig. 16) and turn ring 2) until the notch
identified is aligned with index 3).
Tighten the 3 screws 1) fully down.
Example
MAX output = 2200 MBtu/hr.
If we consult diagram (Fig. 15) we find that for this output, air must
be adjusted using notch 3.
Fig. 15 shows the ideal settings for the ring 2)(Fig. 16).
If the gas main pressure is too low to reach the maximum output
operation pressure indicated in Fig. 21, page 24, and if the ring
2)(Fig. 16) is not fully open, it can be opened wider by 1 or 2 notch-
es.
Continuing with the previous example, Fig. 22 indicates that for
burner RS 70/EV with output of 2200 MBtu/hr a pressure of approx-
imately 2.36 "WC is necessary at test point 6)(Fig. 16).
If the 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.
Installation
Notch
6
5
4
21
Burner output
1
2
3
D9804
D2392
Fig. 15
Fig. 16
20029395
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