Riello G20 Manuel D'entretien page 28

COMBUSTION ADJUSTMENT
In conformity with Efficiency Directive 92/42/EEC the application of the burner on the boiler, adjust-
ment and testing must be carried out observing the instruction manual of the boiler, including verifica-
tion of the CO and CO
temperature of the water in the boiler.
To suit the required appliance output, fit the nozzle then adjust the pump pressure, the setting of the
combustion head and the air damper opening in accordance with the following schedule.
The values shown in the table are measured on a CEN boiler (as per EN 267).
They refer to 12.5% CO
Nozzle
1
GPH Angle
2,00 60°
2,25 60°
2,50 60°
3,00 60°
3,50 60°
4,00 60° / 45°
4,50 60° / 45°
1
NOZZLES RECOMMENDED: Monarch type R - PLP ; Delavan type B - W
Angle :
2
PRESSURE:
3
COMBUSTION HEAD SETTING : This is done when fitting the nozzle, with the blast tube
Terminal plane of the blast tube
D5284
Blast tube
20025344
concentration in the flue gases, their temperatures and the average
2
at sea level and with light oil and room temperature of 20 °C.
2
Pump pressure
2
bar
12
12
12
12
12
12
12
Steinen type S - SS ; Danfoss type S - B
60° : in most cases. Particularly suited to avoid flame-detach-
ment during ignition.
45° : for narrow and long combustion-chambers.
12 bar : the pump leaves the factory set at this value
14 bar : improves flame retention; it is therefore suitable for ignitions at
low temperatures.
removed. It depends on the output of the burner and is car-
ried out by rotating the regulating rod, till the terminal plane
of the blast tube is level with the set-point, as indicated in
the schedule.
2
5 3 1
Regulating rod
Shutter
Comb. head
Burner output
adjustment
kg/h ± 4%
8,0
9,0
10,0
12,0
14,0
16,1
18,0
In the sketch on the left, the combustion
head is set for an output of 3.50 GPH at
12 bar, while the shutter is level with set-
point 3.5, as required by the above
schedule.
6
GB
Air damper
adjustment
3
Set-point Set-point
1
1,5
2
2,5
3,5
5
6
4
3
3,2
3,5
4,3
5,5
6,5
7