Min Output; Max Output - Riello RL 190/M Installation, Use And Maintenance Instructions

Pressure variator
The fuel pressure on the nozzle delivery line is adjusted on the
pressure variator unit and displayed on the pressure gauge
1)(Fig. 30).
The fuel pressure on the nozzle return line is adjusted on the
pressure variator unit and displayed on the pressure gauge
2)(Fig. 30).
The adjustment of fuel MINIMUM pressure on the nozzle
return line is performed only by means of nut 5)(Fig. 30);
screw the above-mentioned nut to decrease the pressure and
loosen it to increase the pressure.
The adjustment of fuel MAXIMUM pressure on the nozzle
return line is performed only by means of screw 6)(Fig. 30)
of eccentric 7)(Fig. 30); tighten the above-mentioned screw to
increase the pressure and loosen it to decrease the pressure.
Air adjustment is performed by means of the screws 3) of the
variable profile cam 2)(Fig. 31), which controls the air damper;
tighten the above-mentioned screws to increase the air flow rate
and loosen them to decrease it.
D1984
1 Nozzle delivery pressure gauge
2 Nozzle return pressure gauge
3 Oil pressure switch
4 Piston stop ring
5 Piston calibration nut and lock nut
6 Eccentric adjustment screw
7 Variable eccentric
8 Eccentric locking screws
Start-up, calibration and operation of the burner
Fig. 30
Air adjustment
Progressively adjust the end profile of cam 2)(Fig. 31) by turning
the screws 5)(Fig. 31).
– Turn the screws clockwise to increase air delivery.
– Turn the screws anticlockwise to reduce air delivery.
D1229
1 Servomotor
2 Variable profile cam
3 Screws for adjusting the cam's adjustable profile
4 Screws for fixing the adjustment
5 Screws for adjusting the cam's adjustable profile
6.3.1

MIN output

MIN output must be selected within the firing rate range indicated
on page 10.
Press button 2)(Fig. 27 on page 26) "output decrease" and keep
it pressed until the servomotor reaches 20° (factory adjustment).
Adjust the fuel pressure on nozzle return line only by means of
nut 5)(Fig. 30); in this way it is possible to set the pressure
required for start-up and minimum output.
6.3.2

MAX output

MAX output must be selected within the firing rate range shown
on page 10.
After having performed the adjustment of minimum ignition and
modulation output, adjust the maximum output by keeping
pressed button 2)(Fig. 27 on page 26) toward the "+" symbol until
the servomotor 27)(Fig. 5, page 12) reaches the maximum
position of 130°.
Once the maximum opening of the servomotor has been
reached, adjust the fuel pressure on the nozzle return line using
only screw 6)(Fig. 30) of the eccentric: in this way it is possible
to set the pressure required for maximum output.
Tighten the screw 6)(Fig. 30) only until the pressure is increased,
so that a variation is ensured throughout the entire rotation angle.
Now lock the nut and the lock nut 5)(Fig. 30) and the two screws
8)(Fig. 30) of the pressure variator unit.
27 GB
Fig. 31
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