Maximum Output; Minimum Output - Riello RS 68/M BLU Installation, Use And Maintenance Instructions

In order to measure the ignition output:
disconnect the plug-socket 1)(Fig. 5 on page 12) on the

ionisation probe cable (the burner will ignite and then go
into lockout after the safety time has elapsed);
perform 10 consecutive ignitions with lockouts;

read the quantity of burned gas on the meter:

this quantity must be equal to, or lower than, the quantity
given by the formula:
3 /h (max. burner delivery)
Sm
Example for G 20 gas (9.45 kWh/Sm
Max. operation output: 600 kW corresponding to 63.5 Sm
After 10 ignitions with a lockout, the delivery indicated on the
meter must be equal to or lower than: 63.5 : 360 = 0.176 Sm
Air adjustment
The air is adjusted by changing the angle of cam III) (Fig. 31 on
page 27) and by using the selector 2)(Fig. 29 on page 26).
To adjust the cam of the servomotor, see Fig. 31.
6.5.3

Maximum output

The MAX output must be set within the firing rate indicated in
Fig. 2 on page 9.
In the above instructions we left the burner running at the MIN
output.
Now press the "increase output" button 2)(Fig. 29 on page 26),
and keep it pressed until the servomotor has opened the air
damper and the gas butterfly valve.
Adjustment of gas delivery
Measure the gas delivery on the meter.
A rough indication can be obtained from Tab. K on page 21, just
read the gas pressure on the "U" pressure gauge (see Fig. 27 on
page 25) and follow the indications.
 If delivery needs to be reduced, diminish outlet gas pressure
and, if it is already very low, slightly close adjustment valve
VR.
 If delivery needs to be increased, increase the adjuster
outlet gas pressure.
Air adjustment
The air is adjusted by changing the angle of cam 4)(Fig. 30 on
page 27) and by using the selector 2)(Fig. 29 on page 26).
To adjust the cam of the servomotor, see Fig. 31.
D891
Start-up, calibration and operation of the burner
360
3
):
Fig. 30
Key (Fig. 30)
1 Servomotor
2 Servomotor 1) - cam 4): fastened
3 Servomotor 1) - cam 4): unfastened
4 Variable profile cam
5 Screws for adjusting the adjustable profile
6 Screws for fixing adjustment
7 Screws for adjusting the end profile
8 Gas butterfly valve graduated sector
9 Index of graduated sector 8
3
/h.
3
10
D3924
6.5.4

Minimum output

The MIN output must be set within the firing rate indicated on
Fig. 2 on page 9.
Press button 2)(Fig. 29 on page 26) "Output decrease" and keep
it pressed until the servomotor reaches (Fig. 31) the factory
adjustment.
Air adjustment
Progressively adjust the end profile of the mechanical cam
4)(Fig. 30 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 28).
Bring the output to 800 kW using the screws 5) of the mechanical
cam 4)(Fig. 30 on page 27) and check the emissions.
Adjustment of gas delivery
The air is adjusted by changing the angle of cam III) of the
servomotor (Fig. 28 on page 26) and by using the selector
2)(Fig. 29 on page 26).
To adjust the cam of the servomotor, see Fig. 31.
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. 31.
27 GB
3
2
Fig. 31
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