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5.7.3
Removing the nozzles
Necessary for the operation within area B) of the "Firing rates"
on page 10.
extract the internal part of the combustion head as described
in paragraph "Nozzle installation" on page 23;
20122232
5.8
Pressure variator
The value of the pressure on the return line of the nozzle is shown
on the pressure gauge 1)(Fig. 22).
The pressure and the flow output of the nozzle are at their maxi-
mum when the servomotor is at the maximum position.
For a correct calibration, the eccentric 6) must operate on the en-
tire range of travel of the servomotor: a pressure variation must
correspond to every variation of the servomotor.
Never take the piston of the variator to the end:
the stop ring 4) determines the maximum travel.
WARNING
WARNING
If you want to check the output delivery of the nozzle, open the
burner, connect a pipe to the nozzle, simulate the ignition and
proceed with the weighing of the fuel at the maximum and mini-
mum pressures.
If at the maximum delivery of the nozzle (maximum pressure on
the return line) pressure oscillations can be seen on the pressure
gauge 1), slightly reduce the pressure until they disappear.
20121288
Installation
2
4
24
unscrew screws 1) and nuts 2);
extract the restrictor 3);
unscrew the nozzles 4) at the front of the head;
replace the restrictor 3).
3
3
2
1
9
Key (Fig. 22)
1
Nozzle return pressure gauge
2
Nozzle delivery pressure gauge
3
Minimum oil pressure switch
4
Piston stop ring
5
Piston calibration nut and lock nut
6
Variable eccentric
7
Maximum oil pressure switch
8
Eccentric cover 6) and nut 5)
9
Cover fixing screw
GB
1
7
4
5
20122199
Fig. 21
6
8
Fig. 22
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