Minimum Output; Intermediate Outputs - Riello RS 64/M MZ Installation, Use And Maintenance Instructions

D518
1 Servomotor
2 Cam 4 engaged/
3 Cam cover
4 Variable profile cam
5 Screws for adjusting the adjustable profile
6 Slit to access the screws 5
7 Index of graduated sector 8
8 Gas butterfly valve graduated sector
6.5.3

Minimum output

MIN output must be selected within the firing rate range indicated
on page 9.
Press and hold the "output reduction" button 2)(Fig. 29 on
page 25) until the servomotor closes the air damper and the gas
butterfly valve is at 15° (factory setting).
Adjustment of gas delivery
Measure the gas delivery on the meter.
If it is necessary to reduce it, slightly decrease the angle of cam I
I I (Fig. 31) with small, regular movements, i.e. bring it from an
angle of 15° to 13° - 11°...
If you need to increase it, lightly press the "increase output"
button 2)(Fig. 29 on page 25) (open the gas butterfly valve by 10-
15°), and increase angle of cam III (Fig. 31) with a series of small
movements, i.e. move from angle 15° to 17° - 19°....
Now press the "power reduction" button until the servomotor
returns to the minimum opening position, and measure the gas
delivery.
Start-up, calibration and operation of the burner
disengaged
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 I I I, remove the snap action
cover 1), as shown in Fig. 31, remove the specific key 2) from
inside and insert it into the notch of cam I I I.
Adjustment of air delivery
Fig. 30
Progressively adjust the beginning profile of cam 4)(Fig. 30) by
turning the screws of the cam that appear inside the opening
6)(Fig. 30). If possible, do not turn the first screw, since this is
used to set the air damper to its fully closed position.
6.5.4

Intermediate outputs

Adjustment of gas delivery
No adjustment of gas delivery is required.
Adjustment of air delivery
Lightly press the "increase output" button 2)(Fig. 29 on page 25)
so that a new screw 5)(Fig. 30) appears inside the opening
6)(Fig. 30), adjust it until optimal combustion is obtained.
Proceed in the same way with the other screws.
Take care that the cam profile variation is progressive.
Switch the burner off with switch 1)(Fig. 29 on page 25), OFF
position, release the adjustable profile cam by setting the
servomotor slot 2)(Fig. 30) in a vertical position and check
several times that by rotating the cam forwards and backwards by
hand, the movement is soft and smooth, without any hindrance.
As far as is possible, try not to move those screws at the ends of
the cam that were previously adjusted for the opening of the air
damper 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.
D793
Fig. 31
27 GB
20169372