20025319
6
GB
COMBUSTION ADJUSTMENT
In conformity with EN267 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
2
concentration in the flue gases, their temperatures and the average 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
2
at sea level and with light oil and room temperature of 20 °C.
RECOMMENDED NOZZLES: Monarch type R
Delavan type W - B
Steinen type S - Q
Danfoss type S
PUMP PRESSURE: 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.
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 indi-
cated in the schedule.
In the sketch on the left, the combustion head
is set for an output of 1.50 GPH at 12 bar,
while the shutter is level with set-point 3, as
required by the above schedule.
Combustion head settings indicated in the
schedule are valid for most cases.
The setting of the fan output according to the installation should normally be done only through the air
damper. Should one subsequently want to retouch also the setting of the combustion head, with the
burner running, operate on the rod (1) with a 6 mm spanner (2) as follows (see fig. 7, page 7).
Nozzle Pump pressure
Burner output
Comb. head
adjustment
Air damper
adjustment
GPH Angle bar kg/h ± 4% Set-point Set-point
1.10 60° 12 4.4 2 3
1.25 60° 12 5.0 2.5 3.4
1.50 60° 12 6.0 3 3.8
1.75 60° 12 7.0 4 4
2.00 60° 12 8.0 5 5
2.25 60° 12 9.0 6 6
2.50 60° 12 10.0 6 7
For 2.00 - 2.25 GPH nozzles it is
advisable to use, if possible,
full cones.
Blast tube
Regulating rod
Shutter
Terminal plane of the blast tube
D5398
2
135
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