Choice Of Nozzle; Nozzle Assembly - Riello RL 190/M TL Installation, Use And Maintenance Instructions

5.6

Choice of nozzle

See diagrams (Fig. 25 and Fig. 26, page 21).
In case an intermediate delivery between the two values indicat-
ed in the diagrams (Fig. 25 and Fig. 26, page 21), is required, a
nozzle with higher delivery must be chosen. Delivery reduction
will be obtained by means of the pressure regulator.
5.7

Nozzle assembly

D1220
D856
D1977
D1222
20024198
Installation
RECOMMENDED NOZZLES:
Type A3 or A4 Bergonzo nozzles - 45° angle
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. 9), 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.
Make sure that the electrodes are positioned as shown in
(Fig. 10)
Finally refit the burner 3) (Fig. 11) 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.
Fig. 9
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. 8,
page 11).
– Remove the nuts 1) (Fig. 12) and the disk 2).
– Use spanner 3) (Fig. 12) to change the nozzles.
Fig. 10
Fig. 11
Fig. 12
12 GB