Combustion Head Adjustment - Riello GI/EMME 1400 Installation, Use And Maintenance Instructions

5.10

Combustion head adjustment

The combustion head moves together with the eccentric 8), the
variable profile cams and the gas butterfly valve. The head
positioning can be seen on cylinder 2) (Fig. 16).
The control levers of the head are calibrated to the maximum
stroke at the factory.
To obtain a different modulation range, calibrate these levers
again so that the stroke of the head is as in the diagram (Fig. 17).
For ignition difficulty proceed as follows:
 Adjust the fuel pressure on the return line
between 5 ÷ 8 bar and regulate the air for a
correct combustion.
ATTENTION
 If difficulties persist, set the combustion head
to the minimum on notch 2 ÷ 3, keeping the
adjustment of the maximum delivery as in the
diagram (Fig. 17).
Example:
With GI/EMME 4500 burner, for a modulation from 1,400,000 to
3,400,000 kcal/h, it is possible to detect from the diagram: notch
1 for 1,400,000 kcal/h, notch 6.5 for 3,400,000 kcal/h, with a
stroke equal to 5,5 notches.
NOTE:
To prevent any sticking, do not exceed the maximum and
minimum opening positions corresponding on cylinder 2)
(Fig. 16) to notch 9 with servomotor at 130° and notch 0
with servomotor at 0°, respectively.
To change the stroke of the combustion head proceed as follows:
control connecting rod 1) of driving rod 8) of combustion
head is provided with a slot; by pulling the tie-rod 9) towards
the outside of the slot the stroke of the head shortens by
approx. 20 mm (approx. 4 notches).
Installation
If a more consistent reduction is needed, act as follows:
 with servomotor at 0°, loosen the screws 5) and push, in the
arrow direction, the ring 6) placed under the variable profile
cam. This allows obtaining a reduction of the eccentricity
with a consequent reduction of the stroke.
Once the desired stroke has been found, firmly lock the screws
5).
In the previous example (stroke 5.5 notches) the start and end of
the stroke must coincide with values 1 and 6.5.
To obtain this, rotate the hexagonal sleeve 3), in one direction or
the other, after loosening the nuts 4).
With servomotor set to 0° notch 1 must match with the reference
plane 10), while with servomotor set to 130° it must match with
notch 6.5.
Once adjustment operations are completed, firmly lock the nuts
4) with the ball joint 9) positioned as in Fig. 16.
Head calibrations are performed with burner closed, not
operating and with released servomotor.
At the end of the adjustment, by allowing the cam 7) to perform a
few travels, check that between 0° and 130° there is no sticking.
Output
19 GB
D1388
Fig. 16
D1387
Fig. 17
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