Operating Position; Preparing The Boiler; Boring The Boiler Plate; Blast Tube Length - Riello DB 4 SE FGR Installation, Use And Maintenance Instructions

4.4

Operating position

 The burner is set up to work only in positions
1 and 2 (Fig. 11).
 Installation 1 is preferable, as it is the only
one that allows the maintenance operations
WARNING
as described in this manual.
 The installation 2 permits the operation, but
makes maintenance and inspection opera-
tions of the combustion head more difficult.
1
4.5

Preparing the boiler

4.5.1

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.
4.5.2

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 (Fig. 14 on page 17), or with a
flame inversion 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.
20169009
Installation
2
20172183
 Any other position could compromise the cor-
rect operation of the appliance.
 Installations 3, 4 and 5 are prohibited for
safety reasons.
DANGER
3 4
D7884
16 GB
5
Fig. 11
3 5 0
4 5 3
Fig. 12