Nozzle Installation; Nozzle Selection; Nozzle Assembly - Riello RL 190/M Installation, Use And Maintenance Instructions

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.
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.
5.10

Nozzle assembly

At this installation stage the burner is still separated from the blast
tube; therefore it is possible to fit the nozzle by loosening the grub
screws (Fig. 14) and removing the swirl turbulator 2)(Fig. 14).
1)
Do not use any sealing products such as: gaskets, tape or
sealants. Be careful to avoid damaging the nozzle sealing seat.
Finally remount the burner 3)(Fig. 15) on 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 the screws 4) that
fix 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:
– open the burner on the slide bars 2)(Fig. 15) as shown in Fig.
12 on page 18.
– Remove nuts 1)(Fig. 16) and disc 2)(Fig. 16).
– Replace the nozzle with wrench 3)(Fig. 16).
 Do not use any sealing products such as:
gaskets, tape or sealants.
 Be careful to avoid damaging the nozzle
sealing seat.
ATTENTION
 The nozzle must be screwed into place tightly
but not to the maximum torque value
provided by the wrench.
20119192
Installation
damage arising from
Fig. 14
It is advisable to replace the nozzle once a year
during periodical maintenance.
ATTENTION
5.9.1

Nozzle selection

See diagrams (Fig. 28 and Fig. 29 on page 26).
If you want a delivery somewhere between the two values shown
in the diagrams (Fig. 28 and Fig. 29 on page 26), select a nozzle
with a higher flow rate.
The reduction in the flow rate is obtained with the pressure
variator.
non-
NOZZLES RECOMMENDED:
Bergonzo type A3 - or A4 - 45° angle.
1
20119193
19 GB
2
3
4 5
20170888
Fig. 15
Fig. 16
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