Operating Position; Preparing The Boiler; Boring The Boiler Plate; Blast Tube Length - Riello DB 2 LSE FGR Installation, Use And Maintenance Instructions

4.4

Operating position

 The burner is designed to work only in posi-
tions 1 and 4 (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 4 permits the operation, but
makes the maintenance and inspection oper-
ations 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 16), or with a
flame inversion chamber, use a protection made out of refractory
material that allows the blast tube to be removed.
For boilers with a water-cooled front a refractory lining is not nec-
essary unless expressly required by the boiler manufacturer.
Installation
2 3
15 GB
 Any other position could compromise the cor-
rect operation of the appliance.
 Installation 5 is prohibited for safety reasons.
DANGER
4
20169799
Model
DB 2 LSE FGR 255
5
D455
A B
325 - 365
Fig. 11
Fig. 12
C
M16
Tab. I
20169116