Burner Start-Up; Burner Adjustment; Determination Of Output Upon Ignition; Maximum Output - Riello RS BLU Serie Instrucciones De Instalación, Uso Y Mantenimiento

6.3

Burner start-up

Feed electricity to the burner via the disconnecting switch on the
boiler panel.
Close the thermostats/pressure switches and turn the switch of to
position 1)(Fig. 29).
Make sure that the lamps or testers connected to
the solenoids, or indicator lights on the solenoids
themselves, show that no voltage is present. If
voltage is present, stop the burner immediately
DANGER
and check the electrical wiring
Carry out the "Start-up procedure", as described in the supplied
cam manual.
6.4

Burner adjustment

The optimum adjustment of the burner requires an analysis of
flue gases at the boiler outlet.
Adjust in sequence:
– Ignition output (minimum)
–

Maximum output

–

Minimum output

6.4.1

Determination of output upon ignition

According to EN 676 standard:
Burners with MAX output up to 120 kW
Ignition can occur at the maximum operation output level. Example:
– max. operation output: 120 kW
– max. ignition output: 120 kW
Burners with MAX output over 120 kW
Ignition must occur at a lower output than the max. operation output.
If ignition output does not exceed 120 kW, no calculations are re-
quired.
If ignition output exceeds 120 kW, the regulatory standard sets that
the value be defined according to the control box safety time "ts":
for "ts" = 3s, ignition output must be equal to or less than 1/3 of the
max. operation output.
Example: MAX operating output 450 kW.
The ignition output must be equal to or less than 150 kW with
ts = 3 s.
In order to measure the ignition output:
 disconnect the plug-socket 6)(Fig. 5 on page 12) on the ioni-
sation probe cable (the burner will fire and then go into lock-
out 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 less than the quantity given
by the formula, for ts = 3s:
Start-up, calibration and operation of the burner
D8049
Qa (max. burner delivery) x n x ts
Vg =
Vg: volume supplied in ignitions carried out (Sm
Qa: ignition delivery (Sm
n: number of ignitions (10)
ts : safety time (sec)
Example for gas G 20 (9.45 kWh/Sm
Ignition output 150 kW corresponding to 15.87 Sm
After 10 ignitions with lockout the output read on the meter must
be equal to or less than:
15.87 x 10 x 3
Vg =
3600
6.4.2 Maximum output
The MAX output must be set within the firing rate indicated in Fig.
2 on page 9.
Gas adjustment
Measure the gas delivery on the gas meter.
A rough indication can be obtained from Tab. J on page 23; just
read the gas pressure on the pressure gauge of Fig. 30 and fol-
low the indications given on page 23.
– If it is necessary to reduce it, lower the output gas pressure
via the pressure adjuster located beneath the gas valve.
– If delivery needs to be increased, increase the adjuster outlet
gas pressure.
Air adjustment
If necessary vary the degrees of the air servomotor.
6.4.3 Minimum output
The MIN output must be set within the firing rate indicated in Fig. 2
on page 9.
27 GB
3600
3
)
3
/h)
3
):
3
/h.
3
= 0.132 Sm
0
1
Fig. 29
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