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4.4
Operating position
The burner is designed to operate only in posi-
tions 1 and 4 (Fig. 11).
Installation 1 is preferable, as it is the only one
that allows the maintenance operations as
WARNING
described in this manual.
Installation 4 permits operation but make main-
tenance and inspection of the combustion head
more difficult.
S9249
4.5
Removing the shutter lockout screws
Remove the screws 1)-2) and nuts before fitting the
burner onto the boiler (Fig. 13).
Replace them with screws 3) M8x12 supplied as
WARNING
standard.
4.6
Preparing the boiler
4.6.1
Boring the boiler plate
Pierce the closing plate of the combustion chamber, as in Fig. 12.
The position of the threaded holes can be marked using the ther-
mal insulation screen supplied with the burner.
4.6.2
Blast tube length
The length of the blast tube must be selected according to the indi-
cations provided by the manufacturer of the boiler, and in any case
it must be greater than the thickness of the boiler door complete
with its fettling.
For boilers with front flue passes 7)(Fig. 14) or flame inversion
chambers, protective fettling in refractory material 5) must be in-
serted between the boiler fettling 6) and the blast tube 4).
This protective fettling must not compromise the extraction of the
blast tube.
For boilers having a water-cooled front the refractory fettling 5)-
6)(Fig. 14) is not required unless it is expressly requested by the
boiler manufacturer.
1
2
Installation
Any other position could compromise the cor-
rect operation of the appliance.
Installations 2, 3 and 5 are prohibited for safety
reasons.
DANGER
3
4
20094549
inch
RLAS 650/EV
RLAS 800/EV
21
GB
5
1
3
2
3
2
1
D 1
D F
Ø
D1
DF
19
17
21 /64"
31 / 64 "
19
17
21 /64"
31 / 64 "
Fig. 11
Fig. 12
20149117
Fig. 13
Ø
M18
M18
Tab. K
20142253
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