Riello RL 190/M Instrucciones De Instalación, Funcionamiento Y Mantenimiento página 25

D889
In order to adjust cam III, especially for fine movements, key 10)
(Fig. 28), held by a magnet under the servomotor, can be used.
Warning
➤ The proper setting of the eccentric 7) (Fig. 24, page 21) is
possible when its operation field follows the servomotor
operation field (20° ÷ 130°): so, that every variation of the
servomotor position corresponds to a pressure variation.
➤ Do not let the piston beat repeatedly: the stop ring 4)
(Fig. 24, page 21) determines the max. stroke.
➤ When the setting has been carried out and the burner
switched off, verify manually, after having released the ser-
vomotor pushing and moving the button 3) (Fig. 28),
towards the right, that betewwn 0° and 130° no slow-down
occurs.
➤ If you wish to check the delivery capacity of the nozzle,
open the burner, attach the nozzle, simulate the start-up
and then proceed with weighing of the maximum and mini-
mum pressures of the fuel.
➤ In the minimum modulation position, in order to facilitate the
firing of the flame, adjust the pressure on the nozzle return
to a value ranging between 3 and 6 mbar with an air pres-
sure to the head, measured at the socket 12) (Fig. 1,
page 7) ≤ 5 mbar.
➤ If, during adjustment of the maximum output, flame instabil-
ity or pressure fluctuations on the return arise, then it is nec-
essary to decrease this pressure until such problems have
been eliminated.
➤ During adjustment of the intermediate outputs it is advisable
to adjust the air in certain positions so that the bearing
which slides over the variable profile foil of the cam is found
directly by the side of one of the screws 3) (Fig. 28), this is
necessary in order that the adjustment carried out on a
screw alters the contiguous adjustments as little as possi-
ble.
Burner calibration
Fig. 28
23 GB 20024198