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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:
Blast tube 7)(Fig. 9)
• short
• long
5.8
Securing the burner to the boiler
Dismantle the nozzle assembly 7)(Fig. 9) and the pipe coupling
5) from the burner 4):
remove the screws 2) from the two slide bars 3);
remove the screw 1) and move the burner on the guides 3);
fix assembly 5) and 7) to the boiler plate and insert the sup-
plied insulating gasket 6).
1
5.8.1
Shutter adjustment
In case of operation with maximum output comprised between
165 and 390 kW, it is necessary to move the shutter 4)(Fig. 10)
one hole backwards with respect to the standard position.
Proceed as follows:
loosen the screws 1) and disassemble the blast tube 2);
move the rod 3) from position A to position B, thereby draw-
ing back the shutter 4).
When the operation is completed, reassemble the blast tube
2) and retighten the screws 1).
Installation
RL 34/1 MZ
216
351
2
4
3
15
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.
Use the four screws supplied after protecting the thread with
antiseizing products.
The burner-boiler seal must be airtight.
WARNING
5
6
GB
10
9
8
L
7
10
D7433
D9291
Fig. 9
Fig. 10
6426
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