Operating Position; Removing The Shutter Lockout Screws; Preparing The Boiler; Boring The Boiler Plate - Riello DB 20 SE FGR TC FS1 FB A0 T150 Installation, Use And Maintenance Instructions

5.4

Operating position

 The burner is set up to work only in positions
1 and 4 (Fig. 11).
 Installation 1 is preferable, as it is the only
WARNING one that allows the maintenance operations
as described in this manual.
 The installation 4 permits the operation, but
makes maintenance and inspection opera-
tions of the combustion head more difficult.
1
20126136
5.5

Removing the shutter lockout screws

Remove the screws 1)-2) and nuts before fitting the burner onto
the boiler (Fig. 12).
Replace them with the screws 3) M8x20 supplied as standard.
5.6

Preparing the boiler

5.6.1

Boring the boiler plate

Pierce the closing plate of the combustion chamber, as in Fig. 13.
The position of the threaded holes can be marked using the ther-
mal insulation screen supplied with the burner.
5.6.2

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 (Fig. 15), or with a flame inver-
sion chamber, a protection in refractory material must be made to
allow the blast tube to be extracted.
For boilers with a water-cooled frontal, a refractory lining is not
necessary unless expressly requested of the boiler manufactur-
er.
20136081
Installation
DANGER
2 3
16 GB
 Any other position could compromise the cor-
rect operation of the appliance.
 Installation 5 is prohibited for safety reasons.
4 5
1
2
2
20111252
1
600 DB20
560 DB16
700
D3893
Fig. 11
3
3
Fig. 12
Fig. 13