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5.5.1 Boring the boiler plate
Drill the combustion chamber locking plate as shown in Fig. 12
(Tab. J). The position of the threaded holes can be marked using
the thermal screen supplied with the burner.
Tab. J
5.5.2 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.
For boilers with front flue passes 1)(Fig. 13) or flame inversion
chamber, a protection in refractory material 5) must be inserted
between the boiler fettling 2) and the blast tube 4).
The refractory can have a conical shape (minimum 60°).
This protective fettling must not compromise the extraction of the
blast tube.
For boilers with a water-cooled front piece, a refractory lining 2)-
5)(Fig. 13) is not necessary, unless expressly requested by the
boiler manufacturer.
5.6 Securing the burner to the boiler
? Fit the heat insulation supplied onto the blast tube
4)(Fig. 13).
? Fit the entire burner onto the boiler hole prepared previously
(Fig. 12), and fasten with the screws supplied.
WARNING
? The burner is designed to operate only in
positions 1 , 2 , 3 and 4 (Fig. 11).
? Installation 1 is preferable, as it is the only
one that allows the maintenance operations
as described in this manual.
? Installations 2 , 3 and 4 permit operation but
make maintenance and inspection of the
combustion head more difficult.
DANGER
? Any other position could compromise the cor-
rect operation of the appliance.
? Installation 5 is prohibited for safety reasons.
Fig. 11
2 3 4 5 1
D7739
mm A B C
RS 510/E BLU 335 452 M18
RS 610/E BLU 350 452 M18
Fig. 12
D455
Prepare a suitable lifting system using the rings
3)(Fig. 13), after removing the fixing screws 7) of
the casing 8).
WARNING
The seal between burner and boiler must be
airtight.

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