Riello 908T4 - Operating Position; Preparing the Boiler; Boring the Boiler Plate; Head Length

20160576
22
GB
Installation
5.4 Operating position
5.5 Preparing the boiler
5.5.1 Boring the boiler plate
Pierce the closing plate of the combustion chamber, as in
(Fig. 15).
The position of the threaded holes can be marked using the ther-
mal insulation screen supplied with the burner.
Tab. L
It is possible to insert a protective device made of refractory
material between the combustion head and the boiler refractory.
This protective device must allow the blast tube to be taken out
(Fig. 16).
5.5.2 Head length
The length of the head must be selected according to the indica-
tions 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.
The range of lengths available, L (mm), is as follows:
Tab. M
WARNING
 The burner is designed to operate only in
positions 1, 2, 4 and 5 (Fig. 14).
 Installation 1 is preferable, as it is the only
one that allows the maintenance operations
as described in this manual.
 Installations 2, 4 and 5 allow operations to be
performed, but make maintenance and
inspection of the combustion head more diffi-
cult.
 All the positions require the installation of the
gas valve with coils facing upwards or hori-
zontally (Fig. 14).
DANGER
 Any other position could compromise the cor-
rect operation of the appliance.
 Installation 3 is prohibited for safety reasons.
 Installation with the coils pointing downwards
is absolutely forbidden.
2 3 4 51
Fig. 14
D7796
mm D1 W1 R DX2 DX1 W6
RX 180-250 S/PV 170 224 M 8 94 70 45°
WARNING
The burners cannot be used on flame inversion
boilers.
Fig. 15
D1
W1
R
DX2
DX1
W6
W6
20145512
WARNING
Do not insert the protection in line with the elec-
trode unit, as this would compromise its good op-
eration.
mm Zona di non combustione
RX 180-250 S/PV 160
Fig. 16
20050572