Riello RL 70/M Instrucciones De Instalación, Funcionamiento Y Mantenimiento página 24

Pressure regulator
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
The nozzle return pressure value is indicated by the pressure
gauge 1)(Fig. 28).
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. 28), of the
nut and lock-nut 4)(Fig. 28).
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.
Adjusting air delivery
D1229
1 Servomotor
2 Adjustable profile cam
3 Adjustment screws for cam profile
4 Adjustment fixing screws
5 Adjustment screws for cam profile
Progressively adjust the end profile of cam 2)(Fig. 29) using ad-
justment screws 5).
– Turn the screws clockwise to increase air delicery.
– Turn the screws counter-clockwise to reduce air delicery.
2915996
Burner calibration
D1227
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:
3)(Fig. 28) determines the max. stroke.
• When the setting is carried out, verify manually that no
slow-down occurs between (page 19) 0° and 130° and that
the maximum and minimum pressures correspond to
those chosen as per diagram (Fig. 27 page 21).
• 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.
2 - Min output
Max output of the burner must be set within the firing rate range
shown on page 9.
Press button 2)(Fig. 26 page 21) " output reduction " and keep it
pressed until the servomotor has reached 20° (factory setting).
Adjusting the nozzle flow rate
The nozzle flow rate is given in diagram (Fig. 27 page 21) corre-
sponding to the pressure on the nozzle return read on the pres-
sure gauge 1)(Fig. 28 page 22).
The output and the pressure of the nozzle are at minimum when
the servomotor is positioned on 20°.
To set return pressure, see page 21.
Adjusting air delivery
Fig. 29
Progressively adjust the starting profile of cam 2)(Fig. 29) by turn-
ing the screws 3).
It is preferable not to turn the first screw since this is used to set
the air gate valve to its fullyclosed position.
22 GB
the stop ring
Fig. 28