Burner Adjustment; Output Upon Ignition; Maximum Output - Riello RS 810/M BLU Modulating Operation

6.6.1

Burner adjustment

The optimum adjustment of the burner requires an analysis of
flue gases at the boiler outlet.
Adjust in sequence:

1 - Output upon ignition

2 - MAX output
3 - MIN output
4 - Intermediate outputs between Min. and Max.
5 - Air pressure switch
6 - Maximum gas pressure switch
7 - Minimum gas pressure switch
6.6.2 Output upon ignition
Ignition must occur at a lower output than the max. operation out-
put. Regulations provide that the ignition output of this burner
must be equal to or less than 1/3 of the MAX operation output.
Example: MAX operation output of 8010 kW.
Ignition output must be equal to or lower than:
2670 kW with ts = 3 s.
In order to measure the ignition output:
 disconnect the plug-socket (Fig. 4 on page 11) on the ionisa-
tion probe cable (the burner starts up and then goes into
lockout after the safety time has elapsed).
 Perform 10 ignitions with consecutive lockouts.
 Read the quantity of gas burned on the meter.
 This quantity must be equal to or lower than the quantity
given by the formula:
/h (max. burner delivery)
3
Sm
Example for G 20 gas (9.45 kWh/Sm
Max. operation output: 8010 kW corresponding to 846.7 Sm
After 10 ignitions with their lockouts, the delivery indicated on the
meter must be equal to or less than: 846.7 : 360 = 2.35 Sm
Air adjustment
The air is adjusted by varying the angle of cam III) (Fig. 31) and
by using the selector 2)(Fig. 27 on page 23). To adjust the cam
of the servomotor, see Fig. 31 A).
6.6.3

Maximum output

The MAX output must be set within the firing rate indicated in
Fig. 2 on page 10.
In the above instructions we left the burner running at the MIN
output. Now press the "increase output" button 2)(Fig. 27 on
page 23), 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 gas meter.
A rough indication can be obtained from Tab. J on page 21, just
read the gas pressure on the "U" pressure gauge, see Fig. 26 on
page 23, and follow the indications.
 If delivery needs to be reduced, diminish outlet gas pres-
sure; if it is already very low, slightly close the VR adjustment
valve.
 If delivery needs to be increased, increase the adjuster out-
let gas pressure.
Start-up, calibration and operation of the burner
360
3
):
Air adjustment
The air is adjusted by varying the angle of cam I) (Fig. 27 on
page 23) and by using the selector 2)(Fig. 27 on page 23). To ad-
just the cam of the servomotor, see Fig. 31 A).
20162254
Key (Fig. 30)
1 Cam
2 Adjustment screws
3 Servomotor
4 Graduated sector for gas butterfly valve
5 Air damper graduated sector
3
/h.
3
90
0
B
20074578
25 GB
3
1
5
2
A
4
Fig. 30
D
C
Fig. 31
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