Burner Start Up And Adjustment; Air/Fuel Adjustment (Oil Version/Mechanic Atomisation) - Riello DB 6 LM C10 TC FS1 A0 T150 Installation, Use And Maintenance Instruction

6

Burner start up and adjustment

6.1

Air/fuel adjustment (oil version/mechanic atomisation)

Fig. 20
1 Cam
2 Adjustment screws
3 Fixing screws
4 Variable profile
When setting the air/fuel ratio for oil burners, the following adjustments must be made:
a) delivery pressure of the oil pump: turn the screw (1) on the pump (to adjust the pressure refer to the diagram on page 13).
b) air cam: turn the threaded regulators (2) after loosening the screws (3).
c) oil cam: change eccentricity by turning the screw (4) after loosening the screws (7). By tightening the screws (4) eccentricity
increases, in this way the difference increases between maximum and minimum return pressure to the nozzle.
Procedures for setting the burner
1 Fit the suitable nozzle to obtain the maximum required delivery. Refer to Paragraph 5.5.
2 Check that the eccentricity of the oil cam is sufficient for a run of approx. 8 mm for the oil modulator shaft. Normally, with an 8
mm run for the shaft, the pressure variation required for modulating the output from minimum to maximum is obtained. To carry
out this control, manually turn the cam after releasing the servomotor using the lever (7)(Fig.16), so that the shaft run is not
excessive or insufficient. When the control is terminated, remember to block the servomotor.
3 Ignite the burner with the selector switch on the control panel in the manual position. At this point, after the pre-ventilation
phase, the servomotor will stop at approx. 20°.
4 Adjust the pump delivery pressure as given in point a), to obtain a delivery pressure of 25 bar.
5 Adjust the return pressure to a minimum of approx. 4 bar.
To do this, the length of the shaft (5) Fig. 22 must be adjusted, by turning the nut.
6 Proceed with setting the air delivery by adjusting the variable profile cam, by turning the screws (2) Fig. 20.
7 After this first adjustment, increase supply output using the automatic return selection switch on the control panel. Stop when
the servomotor has turned by 15° and then effect a new adjustment using the variable profile air cam.
We recommend sufficient setting so as not to create a smoky flame and to reach maximum output as soon as possible (max-
imum run for the servomotor 130°): set the return pressure on the eccentric (screw 4, Fig. 22) to obtain the output required by
the nozzle and then continue with setting the intermediate levels.
8 Check the levels of the combustion parameters at the various modulation outputs and adjust if necessary.
9 When perfect adjustment has been reached, remember to block the adjustment screws of the cam profiles by tightening the
screws (3).
N.B. When setting the cams, do not exceed the servomotor run limits 0° ÷ 130°, to avoid crawling.
Check, by effecting a manual movement of the cam of 0-130°, that there are no mechanical blocks before the micro-switches 1-2
on the servomotor trigger.
14
1 2
3
4
7
D1499
4
Pressure guage
adjustment
5
D8416
1
Fig. 21
D1498
Fig. 22