Combustion Adjustment; Combustion Head Setting - Riello F20 Installation, Use And Maintenance Instructions

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
PUMP PRESSURE: 12 bar - the pump leaves the factory set at this value
3

COMBUSTION HEAD SETTING

This is done when fitting the nozzle, with the
blast tube removed. It depends on the output
of the burner and is carried out by rotating the
regulating rod, till the terminal plane of the
blast tube is level with the set-point, as indicat-
ed in the schedule.
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.
2401
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
Burner output
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.
14 bar - improves flame retention; it is therefore suitable for ignitions at
low temperatures.
Comb. head
adjustment
kg/h ± 4% Set-point
8.0
9.0
10.0
12.0
14.0
16.1
18.0
Terminal plane of the blast tube
D5284
Blast tube
6
GB
Air damper
adjustment
3 4
Set-point
1 2.2
1.5 2.6
2 2.8
2.5 3.5
3.5 4.0
5 5.5
6 6.5
2
5 3 1
Regulating rod
Shutter