Combustion Adjustment; Pump Pressure; Combustion Head Setting - Riello 40 F20 Installation, Use And Maintenance Instructions

COMBUSTION ADJUSTMENT

In conformity with Efficiency Directive 92/42/EEC the application of the burner on the boiler, adjustment
and testing must be carried out observing the instruction manual of the boiler, including verification of
the CO and CO concentration in the flue gases, their temperatures and the average temperature of
2
the water in the boiler.
To suit the required appliance output, choose the proper nozzle and adjust the pump pressure, the set-
ting 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 303).
They refer to 12.5% CO
Nozzle
1
GPH Angle
60°
2.00
60°
2.25
60°
2.50
60°
3.00
60°
3.50
60°
4.00
1
RECOMMENDED NOZZLES : Monarch type R - PLP;
2

PUMP PRESSURE:

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 indicated in the schedule.
Terminal plane of the blast tube
5
D5398
Blast tube
2095
at sea level and with light oil and room temperature of 20 °C.
2
Pump
pressure
2
bar
12
12
12
12
12
13.5
Danfoss type S - B
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.
2
3 1
Regulating rod
Shutter
Burner Comb. head
adjustment
output
kg/h ± 4% Set-point
8.0
9.0
10.0
12.0
14.0
17.0
Steinen type S
; Delavan type B - W
In the sketch on the left below, the
combustion head is set for an out-
put of 3.00 GPH at 12 bar, while
the shutter is level with set-point 3,
as required by the above table.
5
GB
Air damper
adjustment
3 4
Set-point
1 5
. 3.5
2
4.7
2 5
. 5
3
6.5
4
7
6
8