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Installation
4
4.6
Combustion head adjustment
At this stage of installation, the blast tube and the pipe coupling
are secured to the boiler as shown in Fig. 14
Therefore it is particulary easy to carry out the combustion
head adjustments: air and gas.
MINIMUM OUTPUT MODULATIONS:
when the MIN output is between 80 ÷ 129 kW, the
ring nut 2) value must be adjusted to 0.
WARNING
There are two possible cases:
The MINIMUM burner output is over 130 kW.
In the diagram of Fig. 15, find the notch at which both air and gas
can be adjusted according to the MAX output, then:
Air adjustment
Rotate the screw 4) until the notch you have found corresponds
with the front surface 5) of the flange.
Important
To facilitate adjustment, loosen the screw 6), adjust
and then lock.
CAUTION
Central gas adjustment
Loosen the screw 1) and turn ring nut 2) until the notch identified is
aligned with index 3).
Tighten the screw 1) fully down.
Example:
the burner varies its output between MIN = 130 and MAX = 460 kW.
The gas and air adjustments for this output are carried out on
notch 3, like in Fig. 14.
The loss of pressure in the combustion head is shown in column 1
on page 53.
NOTE
The diagram shows the ideal settings for the ring nut 2).
If ring nut 2) is only partially opened, the ring nut can be further
opened 1-2 notch if pressure in the gas feeding network is very
low and the pressure indicated on page 53 in MAX gas cannot
be reached.
To continue the preceding example, on page 53, it can be seen
that 5.4 mbar of pressure in socket 6) are needed for a burner
with a 460 kW output. If this pressure is not available, open 4-5
notch ring nut 2).
Check that the combustion is satisfactory and without pulsa-
tions.
The MINIMUM burner output is lower than 130 kW.
Air adjustment
The same as the previous case: follow the diagram.
Central gas adjustment
The ring nut 2) is always adjusted to position 0, irrespective of
the MAX burner output.
20005963
5
2
D9099
D9091
15
GB
Maximum burner output
4
6
1
3
Fig. 14
Fig. 15
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