15
6423
GB
Installation
5.7
Blast tube length
The length of the blast tube must be selected according to the in-
dications provided by the manufacturer of the boiler, and in any
case it must be greater than the thickness of the boiler door com-
plete with its fettling.
The range of lengths available, L, is as follows:
For boilers with front flue passes 10)(Fig. 9) or flame inversion
chambers, protective fettling in refractory material 8) must be in-
serted between the boiler's fettling 9) and the blast tube 7).
This protective fettling must not compromise the extraction of the
blast tube.
For boilers having a water-cooled front the refractory fettling 8)-
9)(Fig. 9) is not required unless it is expressly requested by the
boiler manufacturer.
5.8
Securing the burner to the boiler
Disassemble the blast tube 7)(Fig. 9) from the burner 4)(Fig. 9)
by proceeding as follows:
Remove the screws 2) from the two slide bars 3).
Remove the screw 1) fixing the burner 4) to the flange 5).
Withdraw the blast tube 7) complete with flange 5) and slide
bars 3).
5.8.1
Combustion head calibration
At this point check, whether the maximum delivery of the burner
in 2nd stage operation is contained in area B or in area C of the
firing rate.
If it is in area B then no operation is required.
If, on the other hand, it is in area C:
unscrew the screws 1)(Fig. 10) and disassemble the blast
tube 2)(Fig. 10).
Move the fixing of the rod 3)(Fig. 10) from position A to posi-
tion B, thereby causing the shutter 4) to retract.
Now refit the blast tube 2) and the screws 1).
Once this operation has been carried out (if it was required), se-
cure flange 5)(Fig. 9) to the boiler plate interposing the supplied
gasket 6).
Use the 4 supplied screws provided after having protected the
thread with antiscruffing products (high-temperature grease,
compounds, graphite). The burner-boiler seal must be airtight.
Blast tube 7)(Fig. 9):
• short
216
• long
351
WARNING
The seal between burner and boiler must be
airtight.
Fig. 9
P
V
4 5 6
1 0
L
7
8
9
3
1 0
2
1
D456
Fig. 10
D457
