Burner Start-Up; Burner Firing - Riello RS 300/E LN Installation, Use And Maintenance Instructions

5.3

Burner start-up

Feed electricity to the burner via the disconnecting switch on the
boiler panel.
Close the thermostats/pressure switches.
Turn the switch to position "LOCAL". (Fig. 37).
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.
When the burner starts, check the direction of the
motor rotation, as indicated in Fig. 37.
As soon as the burner starts up, look at the cooling
WARNING
fan of the fan motor and check it is rotating anti-
clockwise.
If this is not the case:
 place the switch of Fig. 37 in position "OFF"
and wait for the control box to carry out the
switch-off phase;
 disconnect the electrical supply from the
burner;
 invert the phases on the three-phase power
supply.
NOTA:
for further information, please refer to the specific instruction
of the control box.
D11461
20008423
Start-up, calibration and operation of the burner
LOCAL
OFF REMOTE
S8362
Fig. 37
29
5.4

Burner firing

Having completed the checks indicated in the previous heading,
the burner should fire. If the motor starts but the flame does not
appear and the control box goes into lock-out, reset and wait for
a new firing attempt.
If firing is still not achieved, it may be that gas is not reaching the
combustion head within the safety time period of 3 seconds.
In this case increase gas firing delivery.
The arrival of gas at the sleeve is indicated by the U-type ma-
nometer (Fig. 36).
Once the burner has fired, now proceed with global calibration
operations.
Once you have completed adjustments, select AUTOMATIC op-
erating mode on the AZL display.
GB