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7.3.1
Nozzles recommended
Kerosene fuel
Delavan
type W - B
Danfoss
type S
7.4
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.
Example: the combustion head is set for an output of:
– 4.00 GPH at 7/11 bar (for kerosene)
– 3.00 GPH at 9/14 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 instal-
lation 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. 20) 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
and the adhesion of the flame to the air diffuser disc im-
2
proves. (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
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. 20)
at its end facilitates counting the number of turns.
7.5
Air damper adjustment
The settings indicated in the Tab. E refer to the burner with its
metal cover fitted and the combustion chamber with "zero" de-
pression. These regulations are purely indicative.
Each installation however, has its own unpredictable working
conditions: actual nozzle output; positive or negative pressure in
the combustion-chamber, the need of excess air, etc.
All these conditions may require a different air-damper setting.
It is important to take account of the fact that the
air output of the fan differs according to whether
the burner has its metal cover fitted or not.
WARNING
Therefore we recommended to proceed as follows:
adjust the air damper as indicated in the Tab. E;
mount the cover, simply by means of the upper screw;
check smoke number;
should it become necessary to modify the air output, remove
the cover by loosening the screw, adjust the air damper,
remount the cover and finally recheck the smoke number.
Start-up, calibration and operation of the burner
improves
2
Gas oil fuel
Monarch
type R - PLP
Delavan
type W - B
Steinen
type S - SS
Danfoss
type S
D5284
D8068
When the burner works at a firing rate higher than 18 kg/h remove
the panel 1)(Fig. 21) fitted inside the metal cover.
S7352
19
GB
Terminal plane of the blast tube
Shutter
2
5
3
1
Regulating rod
Blast tube
2
6 mm
1
Fig. 19
3
Fig. 20
1
Fig. 21
2903397
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