Nozzle Installation; 6.10 Nozzle Assembly - Riello RL 70/M Installation, Use And Maintenance Instructions

6.9

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 the nozzle once a year
during periodical maintenance.
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
in extremely serious cases, into potential hazards
to people and objects.
CAUTION The manufacturing Company shall not be liable
for any such
observance of the requirements contained in this
manual.

6.10 Nozzle assembly

At this stage of installation the burner is still disassembled from
the blast tube; it is therefore possible to fit the nozzle with the box
spanner 1)(Fig. 15), fitting the spanner through the central hole in
the flame stability disk. Do not use any sealing products such as
gaskets, sealing compound, or tape. Be careful to avoid damag-
ing the nozzle sealing seat.
Finally refit the burner 3)(Fig. 16) to the slide bars 2) and slide it
up to the flange 5), keeping it slightly raised to prevent the
flame stability disk from pressing against the blast tube.
Tighten the screws 1) on the slide bars 2) and screws 4) fixing the
burner to the flange.
If it proves necessary to change a nozzle with the burner already
fitted to the boiler, proceed as outlined below:
– Retract the burner on its slide bars as shown in (Fig. 6 on
page 12).
– Remove the nuts 1)(Fig. 11 on page 15) and the disk 2).
– Use spanner 3)(Fig. 11 on page 15) to change the nozzles.
 Do not use any sealing products such as:
gaskets, tape or sealants.
 Be careful to avoid damaging the nozzle
sealing seat.
WARNING
 The nozzle must be screwed into place tightly
but not to the maximum torque value
provided by the wrench.
Installation
damage arising from
6.9.1 Choice of nozzle
See diagram (Fig. 28 on page 24).
In case an intermediate delivery between the two values indicat-
ed in the diagram (Fig. 28 on page 24), is required, a nozzle with
higher delivery must be chosen. Delivery reduction will be ob-
tained by means of the pressure regulator.
RECOMMENDED NOZZLES:
Type A3 or A4 Bergonzo nozzles - 45° angle
non-
20119193
1
17 GB
20119192
2 3
4
Fig. 14
Fig. 15
20169278
5
Fig. 16
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