17
6423
GB
Installation
The nozzle must be screwed into place tightly but not to the max-
imum torque value provided by the wrench.
The nozzle for the 1st stage of operation is the one lying beneath
the firing electrodes (Fig. 12).
Finally remount the burner 4)(Fig. 13) to the slide bars 3)
and slide it up to the flange 5);
keeping it slightly raised to prevent the flame stability disk
from pressing against the blast tube.
Tighten the screws 2) on the slide bars 3) and screw 1) that
attaches the burner to the flange.
If it proves necessary to change a nozzle with the burner already
fitted to the boiler, proceed as follows:
retract the burner on its slide bars as shown in Fig. 9.
Remove the nuts 1)(Fig. 14) and the disk 2)(Fig. 14).
Use spanner 3)(Fig. 14) to change the nozzles.
5.10
Combustion head setting
At this point of the installation, nozzle and pipe coupling are fixed
to the boiler as in (Fig. 9 on page 15).
The setting of the combustion head depends exclusively on the
delivery of the burner in the 2nd stage - in other words, the com-
bined delivery of the two nozzles selected on page 16 is a partic-
ularly simple operation.
Turn screw 4)(Fig. 15) until the notch shown in diagram (Fig. 16)
is level with the front surface of flange 5)(Fig. 15).
Example (gas oil):
Model with two 3.00 GPH nozzles and 12 bar pump pressure.
Find the delivery of the two 3.00 GPH nozzles in table (E),
page 16: 12.7 + 12.7 = 25.4 kg/h.
Diagram (Fig. 16) indicates that for a delivery of 25.4 kg/h the
model requires the combustion head to be set to three notches,
as shown in Fig. 15.
WARNING
Do not use any sealing products such as gaskets,
sealing compound, or tape. Be careful to avoid
damaging the nozzle sealing seat.
WARNING
Make sure that the electrodes are positioned as
shown in (Fig. 12).
Place the electrode on the ignition pilot observing
the dimensions specified in Fig. 12.
D590
Fig. 12
D460
Fig. 13
Fig. 14
D461
WARNING
On closing the burner on the two guides it is advis-
able to gently pull the high voltage wires outwards
until they are under slight tension.
Fig. 15
D462
2
nd
stage fuel delivery
kg/h
Notches no.
Fig. 16
D8761
