Riello DB 3 LSM C13 Installation, Use And Maintenance Instructions page 52

6
Burner start up and adjustment
6.1 Air/fuel adjustment (oil version/mechanic atomisation)
When setting the air/fuel ratio for oil burners, the following adjust-
ments must be made:
a) delivery pressure of the oil pump: turn the screw A)(Fig. 26)
on the pump (to adjust the pressure refer to the diagram on page
8).
b) air cam: turn the threaded regulators 2) after loosening the
screws 3).
c) oil cam: change eccentricity by turning the screw 4) after loos-
ening the screws 1). By tightening the screws 4) eccentricity in-
creases, 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 5.6.
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 servomo-
tor using the lever 7)(Fig. 17), so that the shaft run is not exces-
sive 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. 27) must be adjusted,
by turning the nut 6).
6 Proceed with setting the air delivery by adjusting the variable
profile cam, by turning the screws 2)(Fig. 25).
7 After this first adjustment, increase supply output using the au-
tomatic return selection switch on the control panel. Stop when
the servomotor has turned by 15° and then effect a new adjust-
ment 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 (maximum run for the servomotor 130°): set the return pressure on
the eccentric screw 4)(Fig. 27) 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
(Fig. 17).
D1499
Gauge
connection
D1498
1
D8416
4 6 5
2
3
Fig. 25
A
Fig. 26
Fig. 27
21