Riello GI/EMME 300 Manuel D'entretien page 24

STARTING THE BURNER
Venting the gas supply
This is done by removing the screw from the
gas pressure switch, or the pressure test point.
FIRING OUTPUT
According to regulation EN 676
Burners with MAX output up to 120 kW
Firing can be performed at the maximum oper-
ation output level. Example:
Max. operation output:
Max. firing output:
Burners with MAX output above 120 kW
Firing must be performed at a lower output than the max. operation output.
If the firing output does not exceed 120 kW, no calculations are required. If firing output exceeds 120 kW, the regula-
tions prescribe that the value be definied according to the control-box safety time "ts".
• For "ts" = 2 s, firing output must be equal or lower than 1/2 of max. operation output.
• For "ts" = 3 s firing output must be equal or lower than 1/3 of max. operation output.
,
Example
MAX operation output of 600 kW
Firing output must be equal or lower than:
- 300 kW with "ts" = 2 s;
- 200 kW with "ts" = 3 s.
AIR PRESSURE SWITCH
Adjust the air pressure switch after having performed all other
burner adjustments with the air pressure switch set to the start of
the scale (A).
With the burner operating in 1st stage, increase adjustment pres-
sure by slowly turning the relative knob clockwise until the burner
locks out.
Then turn the knob anti-clockwise by 1 mbar and repeat burner
starting to ensure it is uniform.
If the burner locks out again, turn the knob anti-clockwise again by
0.5 mbar.
Attention: As a rule, the air pressure switch must be triggered when
the CO in the fumes is equal to or greater than 1% (10.000 ppm). To check this, insert a combustion analyser into
the chimney, slowly close the fan suction inlet (for example with cardboard) and check that the burner locks out,
when the CO in the fumes reaches 1%.
PUMP FIRING
In case of drop-plant with supply from the tank bottom, back off the plug at the vacuumeter-joint 9 (Fig. 1), till the
leaking of the fuel. In the other two situations, start up the burner, bleed the air of manometer-joint 8 (Fig. 1), if you
have a lock out, repeat the cycle.
Attention: before starting up the burner, check that the return pipe has no occlusions. Any occlusions will cause the
break of the pump-sealing organ.
120 kW
120 kW
24
Screw
Pressure gauge
fixing point
Pressure switch
D1955
D1954
Manopolina di
regolazione