Operating Position; Preparing The Boiler - Riello G490 MXK Installation, Use And Maintenance Instructions

4.4

Operating position

 The burner is designed to operate only in
positions 1, 2, 4 and 5 (Fig. 7).
 Installation 1 is preferable, as it is the only
WARNING 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.
 Any other position could compromise the cor-
rect operation of the appliance.
 Installation 3 is prohibited for safety reasons.
DANGER
4.5

Preparing the boiler

4.5.1 Boring the boiler plate
Pierce the closing plate of the combustion chamber, as in Fig. 8.
The position of the threaded holes can be marked using the ther-
mal insulation screen supplied with the burner.
mm A
G490 MXK 163
4.5.2 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 burners cannot be used on flame inversion
boilers.
WARNING
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. 9).
Do not insert the protection in line with the elec-
trode unit, as this would compromise its good op-
eration.
WARNING
mm
G490 MXK
Installation
B C D E
224 M8 100 68
Tab. E
Non-combustion area
180
1 2
D3367
11 GB
3 4 5
20079495
Fig. 7
Fig. 8
20050572
Fig. 9
20113083