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5.9.3
Combustion head adjustment
The stroke of the combustion head is contemporaneous to the
eccentric (8) Fig. 10 on page 16 movement and to that of the cam
with adjustable profil (1) Fig. 13 on page 18. The combustion
head position is noticed on the graduated cylinder (2) Fig. 12.
The control levers of the combustion head are set, by the factory,
for the max. stroke of 50 mm (the stroke is indicated by the set-
point of the graduated cylinder from 0 to 9), this stroke is suitable
for a modulating range from 100 - 450 kg/h.
Using a different modulating range it shall be necessary to re-set
the control levers in order to get the combustion head stroke cor-
responding to the set-points indicated in the diagram below.
Example:
modulating range 180 - 320 kg/h: following the diagram it is clear
that the set-point 2,5 is the proper one for 180 kg/h and set-point
6,5 is for 320 kg/h, so the stroke of the combustion head may cor-
respond to 4 set-points.
in order to avoid any slow-down it is necessary to
not overcome the postions of min. and max. open-
ing, corresponding to:
CAUTION
graduated cylinder (2) Fig. 12:
set-point 9 with servomotor at 130°;
set-point 0 with servomotor at 0°.
In order to vary the stroke of the combustion head, follow these
indications:
the connecting rod (1) which drives the push-rod (8) of the com-
bustion head, is provided with a slot; by moving the tension rod
(9) towards the external part of the slot, the stroke of the combus-
tion head may be shortened up to 20 mm.
If a higher reduction should be necessary, act in this way:
with the servomotor at 0°, loosen the screws (5) and push, in the
arrow direction, the ring (6) placed under the cam with adjustable
profil (7).
So it is obtainable a reduction of the eccentricity with the conse-
quent reduction of the stroke.
After the setting fasten the screws (5).
With the aforesaid settings, the stroke of the combustion head is
fixed.
9
Installation
8
10
1
4
3
17
Following the example (6 set-points) it is necessary that the start
and the end of the stroke are coincident with the desired values:
1 and 7.
In order to obtain this turn the hexagonal coupling (3) clockwise
or anticlockwise, after loosening of the nuts (4).
With the servomotor positioned at 0°, the set-point 1 shall be co-
incident with the reference plane (10), while, if the servomotor is
positioned at 130° the index shall be coincident with the set-point
7.
After the setting fasten the nuts (4) with the ball joint (9), as indi-
cated in the drawing.
The combustion head settings have to be carried out with burner
closed, not in operation and with servomotor free.
After the setting verify manually the operation, by turning the cam
(7), and that no slow-down exists between 0° and 130°.
2
4
7
GB
D2698
kg/h
Fig. 11
5
6
2581
Fig. 12
20036074
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