Choice Of Nozzle; Nozzle Assembly; Combustion Head Setting - Riello RL 28/M Instrucciones De Instalación, Funcionamiento Y Mantenimiento

1 2 3
A3 kg/h bar
15 13 20
20 20 20
30 24 20
40 30 20
50 33 20
60 42 20
70 50 20
(A)
D856
(C)
(E)
(F)
N° Notches
Max. light oil delivery
(G)
4
bar
17
17
15
16
16
16
15
20119564
D462
kg/h
(B)
D857
(D)
20119565
D859
5
CHOICE OF NOZZLE (A)
Nozzle must be chosen among those in table
(A):
1 = Type A3 Bergonzo nozzle
2 = MAX nozzle delivery
3 = Pump delivery pressure
4 = MAX pressure on nozzle return
In case an intermediate delivery between the
two values indicated in the table is required, a
nozzle with higher delivery must be chosen.
Delivery reduction will be obtained by means of
the pressure regulator.
RECOMMENDED NOZZLES:
Type A3 or A4 Bergonzo nozzles - 45° angle.

NOZZLE ASSEMBLY

At this stage of installation the burner is still dis-
assembled from the blast tube; it is therefore
possible to fit the nozzle with the box spanner
1)(B), 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 damaging the nozzle
sealing seat.
Make sure that the electrodes are positioned as
shown in Figure (C).
Finally remount the burner 4)(D) on the slide bars
3) and slide it up to the flange 5), keeping it slight-
ly raised to prevent the flame stability disk from
pressing against the blast tube.
Tighten the screws 2) on the slide bars 3) and
screw 1) that attaches 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:
- Pull back the burner on its slide bars as shown
in fig. (C)p.4.
- Remove the nuts 1)(E) and the disk 2).
- Use spanner 3)(E) to change the nozzles.

COMBUSTION HEAD SETTING

The setting of the combustion head depends
exclusively on the maximum burner delivery at
which it will be operating. Turn screw 4)(F) until
the notch shown in diagram (G) is level with the
front surface of flange 5)(F).
Example:
RL 50/M, maximum light oil delivery = 32 kg/h.
Diagram (G) indicates that for a delivery of 32
kg/h the RL 50/M Model requires the combus-
tion head to be set to approx. three notches, as
shown in Figure (F).