Burner Start-Up; Burner Adjustment; Firing Output; Maximum Output - Riello RS 68/EV BLU Installation, Use And Maintenance Instructions

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
Fig. 33 to position "1".
Make sure that the lamps or testers connected to
the solenoids, or indicator lights on the solenoids
themselves, show that no voltage is present.
DANGER
If voltage is present, stop the burner immediately
and check the electrical wiring
As the burner is not fitted with a device to check the sequence of
the phases, the motor rotation may be incorrect.
As soon as the burner starts up, go in front of the cooling fan of
the fan motor and check it is rotating anticlockwise. See Fig. 33.
If this is not the case:
– place the switch of Fig. 33 in position "0" and wait for the
control box to carry out the switch-off phase;
– disconnect the burner from the electrical supply;
– Invert the phases on the three-phase power supply of the in-
verter (see the specific inverter manual).
This operation must be carried out with the electri-
cal supply disconnected.
DANGER
6.4

Burner adjustment

6.4.1

Firing output

According to the regulation EN 676.
Burners with MAX output up to 120 kW
Ignition can be performed at the maximum operation output level.
Example:
– max. operation output:
– max. firing output:
Burners with MAX output above 120 kW
Ignition must be performed at a lower output than the max. oper-
ation output.
If ignition output does not exceed 120 kW, no calculations are re-
quired. If ignition output exceeds 120 kW, the regulations pre-
scribe that the value be defined according to the control box
safety time "ts":
for ts = 3 s, ignition output must be equal to, or lower than, 1/3 of
max. operation output.
Example:
MAX operation output of 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 7)(Fig. 5 at page 13) 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;
 on the meter, read the quantity of gas burned:
this quantity must be equal to, or lower than, the quantity
given by the formula, for ts = 3 s:
Qa (max. burner delivery) x n x ts
Vg =
3600
Vg volume supplied in ignitions carried out (Sm
Start-up, calibration and operation of the burner
120 kW
120 kW
3
)
Follow the "Start-up procedure" on page 42.
0
1
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 delivery indicated 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 (Fig. 2 at
page 10).
Gas adjustment
Measure the gas delivery on the meter.
As a general rule, this value can be found on Tab. O at page 28,
just read the gas pressure on the pressure gauge (Fig. 41 at
page 54) and follow the indications given on page 28.
– If it is necessary to reduce it, lower the output gas pressure
via the pressure adjuster located beneath the gas valve.
– If it needs to be increased, increase the output gas pres-
sure via the adjuster.
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 (Fig. 2 at
page 10).
33 GB
D8970
3
/h)
3
) :
3
= 0.132 Sm
Fig. 33
3
/h .
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