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4.8
Combustion head adjustment
At this point of the installation, the combustion head is fixed to the
boiler as shown in Fig. 13.
It is therefore especially easy to adjust, and this adjustment de-
pends only on the maximum output of the burner.
4.8.1
Air adjustment
Rotate the screw 2)(Fig. 15) until the notch you have found corre-
sponds with the front surface 1) of the flange.
To facilitate adjustment, loosen the screw 3)
(Fig. 15), adjust and then lock.
CAUTION
D9279
Installation
Two adjustments of the head are foreseen:
–
air adjustment
–
gas adjustment
In Fig. 14, find the notch at which to adjust both air and central gas/
air.
Burner output
4.8.2
Gas adjustment
When the burner is working at the maximum output 5680 MBtu/
hr fit the discs 1) and 2)(Fig. 16), supplied as part of the standard
equipment, removing the internal tube 3)(Fig. 16).
If the mains gas pressure is low, the head can be left in the stan-
dard set-up, limiting the modulation minimum to 1970 MBtu/hr.
Example:
Burner output = 6000 MBtu/hr
The diagram of Fig. 14 shows that the adjustments for this potential
is external air R1 = notch 3.
D8084
1
NOTE:
The diagram indicates the optimum adjustment for a type of boiler
according to Fig. 5.
The adjustments indicated can be modified during the initial start-
up.
Fig. 15
21
GB
D10512
Fig. 14
3
Fig. 16
20044771
2
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