Riello P 450 P/G Manuel D'entretien page 52

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.
Approximate ratio between: nozzle delivery and type (as %) - return pressure
1 - Fluidics N1
2 - Fluidics W2
3 - Bergonzo B3
4 - Bergonzo 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 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.
5483
3
4
Delivery pressure: 25 bar
Durchsatz (%)
9
D3437
NOZZLES AVAILABLE
(delivery in kg/h):
Bergonzo
70
80
2
90
100
125
150
1
175
200
225
250
275
300
325
350
375
400
425
450
Suggested nozzles:
- Fluidics
cut-off)
- Fluidics
off)
- Bergonzo type B3 or B5 (with
cut-off)
You can also fit nozzles with no
shutoff needle (Fluidics N1): in
this case, you lose the feature
preventing dripping on the noz-
zle holder.
GB
Fluidics
70
80
90
100
115
130
145
160
180
200
225
250
275
300
330
360
400
450
type N1 (without
type W2 (with cut-