20033090
16
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 (mm), is as follows:
For boilers with front flue passes 9) or flame inversion chambers,
protective fettling in refractory material 7) must be inserted be-
tween the boiler's fettling 8) and the blast tube 6).
This protective fettling must not compromise the extraction of the
blast tube.
5.8
Securing the burner to the boiler
Disassemble the blast tube 6) from the burner by proceeding as
follows:
– Remove the screws 2) from the two slide bars 3).
– Remove the screws 1) that secure the blast tube 6) to the
burner 4).
– Now disassemble the blast tube complete with the slide bars.
Fasten the blast tube 6) to the boiler plate (Fig. 10 on page 15),
inserting the gasket provided 5). Use the 4 screws provided after
having protected the thread with antiscruffing products (high-tem-
perature grease, compounds, graphite). The burner-boiler seal
must be airtight.
Reassemble the burner 4) on the slide bars 3) and re-insert the
screws 2).
Leave the burner open as shown in (Fig. 11).
Blast tube
shortened
43 mm
standard
185 mm
lengthened
320 mm
Fig. 11
D405
