Riello RL 70/M - Page 27

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20166443
GB
Start-up, calibration and operation of the burner
7.3.1 Pressure regulator
The nozzle return pressure value is indicated by the pressure
gauge 1)(Fig. 29).
The output and the pressure of the nozzle are at maximum when
the servomotor is positioned on 130°.
The fine adjustment of the pressure in the return line may be car-
ried out by changing the setting of the eccentric 6)(Fig. 29), of the
nut and lock-nut 4)(Fig. 29).
The eccentric setting should be carried out by loosening screws
7), and turning the screw 5) to obtain the desired eccentricity.
Turn clockwise the screw 5) to increase the eccentricity, increas-
ing the difference between the min. and max. capacity of the noz-
zle; turn counter-clockwise the screw 5) to decrease the
eccentricity and, consequently the difference between the min.
and max. capacity of the nozzle.
NOTE:
• The proper setting of the eccentric 6) 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
3)(Fig. 29) determines the maximum stroke.
• When the setting is carried out, verify manually that no
slow-down occurs between (page 26) 0° and 130° and that
the maximum and minimum pressures correspond to
those chosen as per diagram (Fig. 28 on page 24).
• 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 min-
imum pressures of the fuel.
• If at the maximum capacity of the nozzle (maximum pres-
sure in the return line) pressure fluctuations are detected
on the manometer 1), slightly decrease the pressure in the
return line until they are completely eliminated.
1 Pressure gauge for pressure on nozzle return
2 Oil pressure switch
3 Ring for piston stop
4 Nut and lock-nut for piston setting
5 Eccentric adjusting screw
6 Variable eccentric
7 Eccentric locking screws
7.3.2 Adjusting air deliver
Progressively adjust the end profile of cam 2)(Fig. 30) using ad-
justment screws 5).
– Turn the screws clockwise to increase air delivery.
– Turn the screws counter-clockwise to reduce air delivery.
1 Servomotor
2 Adjustable profile cam
3 Adjustment screws for cam profile
4 Adjustment fixing screws
5 Adjustment screws for cam profile
Fig. 29
D1227
D1229
Fig. 30