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6.6
Pressure variator
Calibration pressure on return line
With the servomotor in the minimum output position, the nut and
the corresponding lock nut 2)(Fig. 31), should be secured
against the eccentric 3).
With the servomotor at its maximum opening, the eccentric will
press the modulator spindle bringing the pressure, which can be
read on the pressure gauge 1)(Fig. 31), to the desired value
(maximum output).
With the servomotors in the position of maximum output, it is
possible to reduce the pressure on the return line by using the
screw 4.
By turning the screw clockwise the pressure on the return line
drops (the pressure at the nozzle increases), turning it the other
way the pressure on the return line increases (the pressure at
the nozzle drops).
Once the calibration is finished lock the lock nut 5)(Fig. 31).
Calibration pressure on delivery line
To adjust the delivery pressure, operate on the pump as de-
scribed on page 24.
Key (Fig. 31)
1
Return pressure gauge
2
Piston calibration nut and lock nut
3
Fixed eccentric
4
Adjustment screw (maximum output)
5
Locking screws (maximum output)
Start-up, calibration and operation of the burner
Example:
if you use a 450 kg/h nozzle and you want to obtain an output of
4550 kW, the pressure on the pressure gauge 1)(Fig. 31) (maxi-
mum pressure on the return circuit) must be about 14 bar.
The relative delivery pressure on the pressure gauge 1), must be
20 bar (see Tab. K on page 22).
IMPORTANT
For a correct calibration, the eccentric 3) must operate along
the entire range of travel of the servomotor (20 - 130°): a
pressure variation must correspond to every variation of the
servomotor.
Never take the piston of the variator to the end.
If at the maximum delivery of the nozzle (maximum pressure
on the return line) pressure oscillations can be seen on the
pressure gauge 3), slightly reduce the pressure until they
disappear.
NOTE:
The burner is factory set with maximum pressure on the return
line of approximately 14 bar and delivery pressure of approxi-
mately 25 bar.
31
GB
20085013
Fig. 31
20084880
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