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17
20098687
GB
Installation
5.8
Combustion head adjustment
At this stage of installation the blast tube and the pipe coupling
are secured to the boiler as shown in Fig. 13.
Therefore the adjustment of the combustion head is particularly
easy, an adjustment that depends solely on the maximum power
of the burner.
Therefore, this value must be set before adjusting the combus-
tion head.
There are provisions for three adjustments of the head:
–
that of the external air R1;
–
that of the central air R2;
–
that of the gas R3.
In the diagram (Fig. 14) find the notch to which both the air and
the gas should be adjusted and then:
Adjusting R1 external air
➤
Turn the screw 4)(Fig. 13) until the notch found lines up with
the front surface 5) of the flange.
Gas adjustment R3
➤
Loosen the screws 1) and 4)(Fig. 13) and rotate the ring nut
2) until the notch you have found lines up with the index 3).
Central air adjustment R2
➤
Turn the shutter 5)(Fig. 13) until the notch found lines up
with the screw 4).
➤
Block screws 1) and 4).
Example
Burner output = 400 kW.
The diagram (Fig. 14) shows that for this burner output the ad-
justments are:
–
external air: R1 = notch 5.3;
–
central air: R1 = notch 2.7;
–
gas: R3 = notch 0.7.
Fig. 12
D1080
WARNING
The adjustments indicated can be modified during
the initial start-up.
Fig. 13
D1083
Fig. 14
No. notches
Max. burner output
7
S8877
Summary of Contents for 3897304
Page 2: ...Translation of the original instructions ...
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