Start-up, calibration and operation of the burner
8.3.1 Nozzles reccomended
8.4 Pump pressure
8.5 Combustion head adjustment
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 rotat-
ing the regulating rod, till the terminal plane of the blast tube is
level with the set-point, as indicated in the Tab. E.
Exsemple: the combustion head is set for an output of:
– 4.50 GPH at 8 bar (for kerosene)
– 3.50 GPH at 12 bar (for gas oil)
The shutter is level with set-point 3.5, as required by the Tab. E.
Combustion head settings indicated in the Tab. E 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)(Fig. 19) with a 6 mm spanner 2) as follows:
TURN TO THE RIGHT: SIGN +
In order to increase the volume of air entering the combustion
chamber and thus diminishing its pressure.
There is a reduction of CO
2
and the adhesion of the flame to the
air diffuser disc improves.
(Setting advisable for ignitions at low temperatures).
TURN TO THE LEFT: SIGN –
In order to reduce the volume of air entering the combustion
chamber and thus increasing its pressure.
The CO
2
improves and the adhesion of the flame to the diffuser
tends to reduce.
(This setting is not advisable for ignitions at low temperatures).
In any case do not bring the combustion head setting more than
one point away from that indicated in the Tab. E.
One set-point corresponds to 3 turns of the rod; a hole 3)(Fig. 19)
at its end facilitates counting the number of turns.
Kerosene fuel
Monarch type R
Delavan type B - W
Steinen type S - Q
Danfoss type S - B
For 2.50 - 3.00 GPH nozzles it is advisable to use,
if possible, full cones.
Gas oil fuel
Monarch type R - PLP
Delavan type B - W
Steinen type S - SS
Danfoss type S - B
Angle: 60°- in most cases. Particularly suited to avoid flame-
detachment during ignition.
45° - for narrow and long combustion-chambers.
Kerosene fuel
8 bar: the pump leaves the factory set at this value.
10 bar: maximum pressure for kerosene.
Gas oil fuel
12 bar: the pump leaves the factory set at this value.
14 bar: improves flame retention; it is therefore suitable for ig-
nitions at low temperatures.
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