Burner Calibration Procedure - Riello DB 12 LSM C13 Installation, Use And Maintenance Instructions

6.4.2 Air cam
Use the adjusters 2)(Fig. 28) after loosening the screws 3).
Key (Fig. 28)
1 Cam
2 Adjustment screws
3 Locking screws
4 Adjustable profile
6.4.3 Oil cam
Modify the eccentricity by turning the screw 3)(Fig. 29) after hav-
ing loosened the screws 2).
By tightening the screw 3) the eccentricity increases, thereby in-
creasing the difference between the maximum and minimum re-
turn pressure of the nozzle.
Key (Fig. 29)
1 Eccentric screw
2 Screws
3 Eccentricity adjustment screw
4 Nut and lock nut
5 Stop ring
6 Delivery pressure gauge
7 Return pressure gauge
6.5

Burner calibration procedure

1 Install the nozzle suitable to achieve the maximum desired
output.
2 Verify that the eccentricity of the oil cam is such to make a
travel of about 8 mm on the shaft of oil modulator. Normally,
with a shaft travel of 8 mm, the pressure variation needed
for the modulation of the minimum to maximum output is
obtained.
To verify this, manually rotate the cam after having released
the servomotor using the lever 7)(Fig. 26 on page 27), so
that the travel of the shaft is not exaggerated or insufficient.
Remember to block the servomotor after the verification.
3 Switch on the burner, with the selector on the control panel
set to manual.
At this point, after the pre-purging phase, the servomotor
stops at about 20°.
4 Adjust the outlet pressure of the pump as shown at point a)
to obtain an outlet pressure at the nozzle of 25 bar.
5 Adjust the minimum return pressure to approx. 4 bar.
To do this, the length of the modulator shaft must be
changed using the nut 4)(Fig. 29).
6 Calibrate the air delivery by adjusting the variable profile
cam with the screws 2)(Fig. 28).
7 Having performed this first adjustment, increase the output
supplied via the automatic return selector on the control
panel.
Pause after a 15° rotation of the servomotor and perform
another adjustment by means of the variable profile cam of
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Start-up, calibration and operation of the burner
1
1
3
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the air.
It is recommended that a calibration be carried out that is
sufficient for not creating a smoky flame and for reaching
maximum output (maximum travel of the servomotor 130°);
calibrate the return pressure on the eccentric screw
3)(Fig. 29), to achieve the output desired and requested by
the nozzle and then calibrate the intermediate points.
8 Then re-check the values of the combustion parameters at
the various modulation outputs and if necessary make the
necessary adjustments.
9 With the optimal adjustment achieved, remember to lock the
adjustment screws of the cam profiles by means of screws
3)(Fig. 28).
When calibrating the cams, never go beyond the
travel limits of the servomotor 0° - 130° to avoid
any sticking.
WARNING
Carrying out a manual travel 0 -130° of the cams,
check that there are no mechanical stops before
the micro-switches 1-2 of the servomotor are acti-
vated.
28 GB
4 2
D1499
4
5
2
6
3
Fig. 28
7
Fig. 29