5483
9
GB
B - ADJUSTMENT OF THE PRESSURE CONTROLLER
The variation of the pressure in the return line (manometer 3 fig. 3) modifies the fuel delivery from the nozzle.
Ratio between nozzle delivery and type - pressure in the return line
Suggested nozzles:
Fluidics
type N1
Bergonzo
type B-SA (without cut-off)
To properly rate the output range of the nozzle operation, it is necessary to set the maximum and minimum pressure
of the fuel in the return line from the nozzle, in compliance with the above diagram.
-
After the nozzle set-up, remove the protective cover of the servomotor 12) fig.1, and ignite the burner.
-
After the burner ignition, disconnect the plug placed on the electric board 19) fig.1, to take the voltage off from the
servomotor.
In this way the burner operates at the minimum output.
-
Acting on the re-set lever 6) fig.2 disjoin the cam 1) fig.5 from the motor of the servomotor.
-
Turn manually and slowly the cam with adjustable profil 1) fig.5 firmly connected to the eccentric 8) fig.3 and check
the pressure variation by the manometer 3) fig.3.
-
The output and the pressure of the nozzle are at minimum when the servomotor is on the position of 20°, while
they are at maximum when the servomotor is positioned on 130°.
The fine adjustment of the pressure in the return line could be carried out by changing the setting of the eccentric
8) fig.3, of the nut and lock-nut 6) fig.3.
Return line pressure
bar
Delivery
kg/h
Diagram referred to
Fluidics type N1 - 50° with
delivery pressure of 25 bar
D2781
