Choice Of Nozzle; Nozzle Assembly; Combustion Head Setting - Riello RL 28/M Electrical Installation, Use And Maintenance Instructions

1 2 3
A3 - A4 GPH PSI
15 4.2 290
20 6.4 290
30 7.7 290
40 9.6 290
50 10.6 290
60 13.4 290
70 16 290
(A)
D2528
(C)
(E)
(F)
N° - Notches
(G)
4
PSI
246.5
246.5
217.5
232
232
232
217.5
D855
D462
Max fuel oil delivery USGPH
(B)
D857
(D)
D858
D2529
6
CHOICE OF NOZZLE (A)
It is advisable to replace nozzles once a year
during periodical maintenance.
The use of nozzles other than those specified by
the Manufacturer 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.
The Manufacturer shall not be liable for any
such damage arising from non-observance of
the requirements contained in this manual.
Nozzle must be chosen among those in table (A):
1 = Type A3 or A4 return flow 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 A4 return flow nozzles - 45° angle.

NOZZLE ASSEMBLY

At this stage of installation the burner is still disassem-
bled from the blast tube; it is therefore possible to install
the nozzle with a box wrench 1)(B), fitting the wrench
through the central hole in the flame stability disk. Do not
use any sealing products such as gaskets, sealing com-
pound, 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 slightly raised to pre-
vent 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.5.
- Remove the nuts 1)(E) and the disk 2).
- Use wrench 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 oper-
ating. 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 fuel oil delivery = 10.2 GPH.
Diagram (G) indicates that for a delivery of 10.2 GPH
the RL 50/M Model requires the combustion head to be
set to approx. three notches, as shown in Figure (F).