Riello ENNE 1400 Mode D'emploi page 46

PRESSURE VARIATOR
To calibrate cam 8):
Remove gear-case 9), slacken screws 7), and act on screw
4) until required eccentricity is obtained.
Turning screw 4) to the right (+ sign), eccentricity is increa-
sed, thus increasing the difference between nozzle miximum
and minimum delivery.
Turning screw 4) to the left (- sign), eccentricity si reduced,
thereby reducing the difference between nozzle maximum
and minimum delivery.
Every variation of eccentricity may require a travel offset
using nut and locknut 6).
1 Pressure switch fitting
2 Delivery pressure gauge
3 Return pressure gauge
4 Cam adjustment screw
5 Piston halt ring
6 Piston calibration nut and
locknut
7 Cam locking screws
8 Variable cam
9 Gear-case
COMBUSTION HEAD ADJUSTMENT
The combustion head moves simultaneously with cam 8)(Fig.
11), the variable profile cams and the gas butterfly. Head position
can be seen on cylinder 2)(Fig. 13).
The head control lever systems are factory-calibrated for maxi-
mum travel.
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NB:
To obtain correct calibration, cam 8) must operate over the
full travel range of the servomotor (20° - 130°): every varia-
tion of the servomotor must be matched by a variation in
pressure.
Never give the variator piston a snug fit: stop ring 5) sets
maximum travel.
When the adjustment has been made, manually check that
there is no Knocking between 20° and 130° and that maxi-
mum and minimum pressures match pre-selected values as
indicated on the graph Fig. 10.
If, at maximum nozzle delivery (maximum return pressure),
pressure oscillations are seen on pressure gauge 3), slightly
reduce pressure until the oscillations are eliminated.
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If a different modulation range is required, these levers must be
recalibrated so that head travel takes place as illustrated in the
following graph.
Output
8 GB
Fig. 11
Fig. 12