Minimum Output; Intermediate Outputs - Riello RLS 190/M MZ Installation, Use And Maintenance Instructions

6.7.4

Minimum output

MIN output must be selected within the firing rate range indicated
on Fig. 2, on page 9. Press button 2)(Fig. 35, on page 26)
"Output decrease" and keep it pressed until the servomotor
reaches (Fig. 37) the factory adjustment.
Air adjustment
Progressively adjust the end profile of the mechanical cam 4)
Fig. 36, on page 27, using the screws 5).
For example, calibrate the minimum output to 800 kW, check the
emissions and if necessary increase or decrease the opening of
the air damper ("Air adjustment" on page 27.).
Bring the output to 800 kW using the screws 5) of the mechanical
cam (Fig. 38, on page 29) and check the emissions.
Adjustment of gas delivery
The regulation of the air is carried out using the angle of the cam
III) of the servomotor (Fig. 38, on page 29) and by using the
selector 2)(Fig. 35, on page 26).
To adjust the cam of the servomotor, see Fig. 37).
NOTE:
The servomotor follows the adjustment of cam III only when
the angle of the cam is reduced. If it is necessary to increase
the angle of the cam, you must first increase the angle of the
servomotor by means of the "output increase" key, then
increase the angle of cam III, and finally bring the
servomotor to the position of MIN output, with the "Output
reduction" key.
To adjust cam III, see Fig. 37.
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Start-up, calibration and operation of the burner
6.7.5

Intermediate outputs

Adjustment of gas delivery
No adjustment is required
Air adjustment
After adjusting the maximum and minimum output of the burner,
carry out air adjustment on higher intermediate positions of the
servomotor.
The passage from one position to the next one is obtained by
pressing the button 2) on the symbol (+) or (-) (Fig. 35, on
page 26). Press button 2)(Fig. 35, on page 26) "Output increase"
briefly so that the servomotor rotates by about 20°, see
servomotor graduated index Fig. 37 and air damper graduated
index 5) (Fig. 36 on page 27).
Screw or unscrew the screw 5) of the mechanical cam (Fig. 36,
on page 27) to increase or decrease the gas output so as to
adjust it to the corresponding air output, to obtain optimal
combustion.
Proceed in the same way with the other screws.
Take care that the cam profile variation is
progressive.
ATTENTION
Switch off the burner using switch 1)(Fig. 35), OFF position,
release the mechanical cam I)(Fig. 38) to separate the gears of
the servomotor, pressing and moving downwards button
3)(Fig. 37), then manually rotate the mechanical cam I)(Fig. 37)
backwards and forwards a few times to check that the movement
is smooth and without any hindrance.
It is recommended that the mechanical cam
5)(Fig. 36 on page 27) be bound again to the
servomotor by shifting button 3)(Fig. 37) upwards.
ATTENTION
As far as is possible, try not to move those screws at the ends of
the mechanical cam that were previously adjusted for the
opening of the gas butterfly valve to MAX and MIN output.
NOTE:
Once "MAX - MIN - INTERMEDIATE" outputs have been
adjusted, recheck the ignition: its noise must be equal to the
one of the following operation.
If you notice any sign of pulsations, reduce the ignition
stage delivery.
28 GB