Choice Of Nozzle; Nozzle Assembly; Combustion Head Setting - Riello RL 70/M Installation, Use And Maintenance Instructions

(A) D1220
D2528
(B)
(D)
(E)
N° Notches
(F)
D1221
D462
Max Fuel oil delivery USGPH
CHOICE OF NOZZLE (A)
See diagrams (B)page 11.
In case an intermediate delivery between the two values
indicated in the diagrams (B) page 11 is required, a noz-
zle with higher delivery must be chosen. Delivery reduc-
tion 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 fit the
nozzle with the box wrench 1)(A), inserting the wrench
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 (B).
Finally remount the burner 3)(C) 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 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:
- Pull back the burner on its slide bars as shown in fig.
(B)p.6.
- Remove the nuts 1)(D) and the disk 2).
- Use wrench 3)(D) to change the nozzles.
(C)

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)(E) until the notch shown in diagram (F) is
level with the front surface of flange 5)(E).
Example:
RL 70/M, maximum light oil delivery = 16 GPH
Diagram (F) indicates that for a delivery of 16 GPH the
RL 70/M Model requires the combustion head to be set
to approx. three notches, as shown in Figure (E).
D1222
D2351
7