Output In 1St Stage - Riello 20194153 Installation, Use And Maintenance Instructions

5.6.3

Output in 1st stage

The 1st stage output must be selected from within the firing rate
range shown on page 4.
Turn the switch 2)(Fig. 28 on page 24) to the 1st stage position:
the servomotor 1)(Fig. 33) will close the air damper and, at the
same time, also the gas butterfly valve closes to 15°, i.e. to the
factory setting.
Adjustment of gas delivery
Measure the gas delivery on the gas meter.
– If it is necessary to decrease it, slightly decrease the angle of
the orange lever (Fig. 32 on page 25) namely from angle 15°
to 13° - 11°....
– If it is necessary to increase it, pass to 2nd stage by activating
the switch 2)(Fig. 28 on page 24) and slightly increase the an-
gle of the orange lever with small, regular movements, i.e.
bring it from an angle of 15° to 17° - 19°....
Now return to the 1st stage and measure the gas output.
NOTE:
The servomotor only follows the adjustment of the orange
lever when the angle of the cam is reduced.
If the angle needs to be increased, pass to the 2nd stage, in-
crease the angle and then return to the 1st stage to check the
effects of the adjustment.
Adjustment of air delivery
Progressively adjust the initial profile of the cam 3)(Fig. 33) by
turning the screws 4).
It is preferable not to turn the first screw since this is used to set
the air damper to its fully closed position.
Start-up, calibration and operation of the burner
27 GB
20194185