Burner Firing - Riello RL 190/M Instrucciones De Instalación, Funcionamiento Y Mantenimiento

8.1

Burner firing

Notes on safety for the first start-up
The first start-up of the burner must be carried out
by qualified personnel, as indicated in this manual
and in compliance with the standards and regula-
tions of the laws in force.
WARNING
Check the correct working of the adjustment, com-
mand and safety devices.
WARNING
Before firing the burner, make sure that the air and fuel regulation
parts are workable; in other words loosen the screws 4) of the
cam 2) (Fig. 27), loosen the nut and lock nut 5) (Fig. 24) and the
two screws 8) (Fig. 24) of the pressure transformer unit and ec-
centric (Fig. 24).
Close load controls and set switch 1) (Fig. 22, page 20) to "MAN".
The burner will start and after the pre-purge stage the flame will
light.
1 - MIN Output
Min. output must be selected within the firing rate range seen on
page 8.
Press button 2) (Fig. 23, page 20) " output reduction " and keep
it pressed until the servomotor has reached 20° (factory setting).
Adjust the pressure of the fuel on the nozzle return, operating
solely by means of the nut 5) (Fig. 24); the desired pressure for
firing and minimum output is set in this manner.
2 - Output MAX
Max output of the burner must be set within the firing rate range
shown on page 8.
After adjusting the firing and minimum modulation output, pro-
ceed with adjusting the maximum output by pressing the button
2) (Fig. 23, page 20) towards the "+" sign until the servomotor 27)
(Fig. 1, page 7) reaches the maximum position of 130°.
Once maximum opening of the servomotor has been
achieved, adjust the pressure of the fuel on the nozzle return
again only by means of the screw 6) (Fig. 24) of the eccentric;
the desired pressure for maximum output is set in this manner.
Screw down the screw 6) (Fig. 24) only until it corresponds to an
increase in pressure; in this way a variation on the whole rotation
angle is ensured.
At this point lock the nut and the lock nut 5) (Fig. 24) and the two
screws 8) (Fig. 24) of the pressure transformer unit.
3 - Intermediate output
The setting of the minimum and maximum pressure automatically
determines the pressure values and therefore those of the inter-
mediate outputs.
20024198
Burner calibration
Combustion setting
D1229
1 Servomotor
2 Adjustable profile cam
3 Adjustment screws for cam profile
4 Adjustment fixing screws
5 Adjustment screws for cam profile
During setting of the minimum and maximum pressure it is suffi-
cient to regulate an acceptable excess of combustion air judged
visibly solely.
Only after having set the minimum and maximum pressure, carry
out an accurate setting of the combustion on different positions of
modulation operating solely on the setting of the air delivery by
means of the screws 3) (Fig. 27) of the cam.
Press the switch 2) (Fig. 23, page 20) "output increase" a little so
that the servomotor turns by about 15°. Adjust the screws until
optimal combustion is obtained. Proceed in the same way with
the other screws.
Take care that the cam profile variation is progressive.
Once the setting of the combustion is complete, lock the screws
4) (Fig. 27) and check ignition once again: noise emission at this
stage must be identical to the following stage of operation.If you
notice any sign of pulsations, reduce the ignition stage delivery.
NOTE:
The servomor follows the adjustment of cam III only when
the cam angle is reduced. If it is necessary to increase the
cam angle, first increase the servomotor angle with the key
"output increase", then increase the III cam angle, and finally
bring the servomotor back to the MIN output position with
the key "output decrease".
22 GB
Fig. 27