Ignition Output Of The Burner; Air / Fuel Adjustment - Riello GI/EMME 1400 Installation, Use And Maintenance Instructions

6.9

Ignition output of the burner

According to EN 676 standard
Burners with MAX output above 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 required. If ignition output exceeds 120 kW, the regulatory
standard sets that the value be defined according to the control
box safety "ts" time.
• For "ts" = 2s, ignition output must be equal to or lower than 1/
2 of max. operation output.
• For "ts" = 3s, ignition output must be equal to or lower than 1/
3 of max. operation output.
Example:
MAX operation output of 1800 kW.
Ignition output must be equal to or lower than:
- 900 kW con ts = 2s;
- 600 kW con ts = 3s.
In order to measure the ignition output:
 Disconnect the ionisation probe cable (the burner will fire
and then go into lockout after the safety time has elapsed).
 Perform 10 ignitions with consecutive lockouts.
 Read the quantity of gas burned on the meter.
6.10

Air / fuel adjustment

The following adjustments must be performed during the
calibration of the air/fuel ratio:
A Oil pump delivery pressure:
act on the screw 5)(Fig. 4 on page 11) located on the pump.
B Air cam:
act on the adjustment screws 2)(Fig. 35) after having
loosened the screws 3).
C Gas cam:
act on the adjustment screws 2)(Fig. 34) after having
loosened the screws 3).
D Oil cam:
modify the eccentricity by acting on the screw 4)(Fig. 33)
after having loosened the screws 7).
By tightening the screw 4) the eccentricity increases,
thereby increasing the difference between the maximum
and minimum return pressure of the nozzle.
Key (Fig. 33)
1 Pressure switch connection
2 Delivery pressure gauge
3 Return pressure gauge
4 Eccentric adjustment screw
5 Piston stop ring
6 Piston calibration nut and lock nut
7 Eccentric locking screws
8 Variable eccentric
9 Cover
6.10.1 Air cam
Use the adjusters 2)(Fig. 34) after loosening the screws 3).
Key (Fig. 34)
1 Cam
2 Adjustment screws
3 Locking screws
4 Adjustable profile
20160907
Start-up, calibration and operation of the burner
This quantity must be equal to or lower than the quantity given by
the formula:
3
/h (max. burner output)
Nm
Example (for G20):
Max. operation output: 1800 kW corresponding to 180 Nm
After 10 ignitions with a lockout, the delivery indicated on the
meter must be equal to or lower than:
3
180: 360 = 0.5 Nm .
1
32 GB
360
4 2
D1499
3
/h.
D3437
Fig. 33
3
Fig. 34