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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 TYPEPRESSURE IN THE RETURN LINE
Suggested nozzles: Bergonzo type B5.
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 the 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).
5507
Diagram referred to Bergonzo
nozzles type B5- 50° with
delivery pressure of 25 bar.
- Suggested spray angle 50°.
- For narrow combustion chamber:
nozzle spray angle 35°.
Delivery kg/h
12
GB
D3432
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