Blast Tube Length; Securing The Burner To The Boiler; Nozzle Installation; Recommended Nozzles - Riello RL 190/M Installation, Use And Maintenance Instructions

5.7

Blast tube length

The length of the blast tube 9)(Fig. 10) must be selected accord-
ing to the indications 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.
For boilers with front flue passes 12)(Fig. 10) or flame inversion
chambers, protective fettling in refractory material 10) must be in-
serted between the boiler fettling 11) and the blast tube 9).
5.8

Securing the burner to the boiler

Disassemble the blast tube 9)(Fig. 10) from the burner 6) by pro-
ceeding as follows:
 loosen the four screws 3) and remove the cover 1);
 remove the screws 2) from the two slide bars 5);
 remove the two screws 4) fixing the burner 6) to the flange
7);
 withdraw the blast tube 9) complete with flange 7) and slide
bars 5).
 Secure flange 7) to the boiler plate interposing the supplied
gasket 8).
 Use the 4 screws provided after having protected the thread
with antiscruffing products.
The burner-boiler seal must be airtight.
WARNING
5.9

Nozzle installation

The burner complies with the emission requirements of the
EN 267 standard.
In order to guarantee that emissions do not vary, recommended
and/or alternative nozzles specified by Riello in the Instruction
and warning booklet should be used.
It is advisable to replace nozzles every year
during regular maintenance operations.
WARNING
The use of nozzles other than those specified by
Riello S.p.A. and inadequate regular maintenance
may result into emission limits non-conforming to
the values set forth by the regulations in force, and
CAUTION
in extremely serious cases, into potential hazards
to people and objects.
The manufacturing company shall not be liable for
any such damage arising from nonobservance of
the requirements contained in this manual.
5.9.1

Recommended nozzles

Type A3 or A4 Bergonzo nozzles - 45° angle.
5.9.2

Choice of nozzle

In case an intermediate delivery between the two values indicat-
ed in the diagrams (Fig. 11 and Fig. 12), is required, a nozzle with
higher delivery must be chosen.
Delivery reduction will be obtained by means of the pressure reg-
ulator.
Installation
This protective fettling must not compromise the extraction of the
blast tube.
For boilers having a water-cooled front the refractory fettling 10)-
11) is not required unless it is expressly requested by the boiler
manufacturer.
D1916
Type A3 Bergonzo nozzles (45°) - delivery pressure 20 bar
D1982
Type A4 Bergonzo nozzles (45°) - delivery pressure 20 bar
D1983
15
GB
Return pressure - bar
Return pressure - bar
Fig. 10
Fig. 11
Fig. 12
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