6
NOZZLE ASSEMBLY
At this stage of installation the burner is still dis-
assembled from the blast tube; it is therefore
possible to fit two nozzles with the box spanner
1)(A) (16 mm), after having removed the plastic
plugs 2)(A), fitting the spanner through the cen-
tral 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. The nozzles must be
screwed into place tightly but not to the maxi-
mum torque value provided by the wrench.
The firing nozzle is the one lying beneath the fir-
ing electrodes fig. (B).
Make sure that the electrodes are positioned as
shown in fig. (B).
Finally remount the burner 4)(C) to the slide bars
3) 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 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:
- Retract the burner on its slide bars as shown
in fig. (B)p.5.
- Remove the nuts 1)(D) and the disk 2).
- Use spanner 3)(D) to change the nozzles.
COMBUSTION HEAD SETTING
The setting of the combustion head depends ex-
clusively on the delivery of the burner, in other
words, the combined delivery of the two nozzles
selected on page 5.
Turn screw 4)(E) until the notch shown in dia-
gram (F) is level with the front surface of flange
5)(E).
Example RL 28/1:
with nozzles:
1° = 2.75 GPH + 2° = 1.75 GPH and 14 bar pump
pressure.
Find the delivery of the two nozzles in Table
(C)p.5 , 20.7 kg/h.
Diagram (F) indicates that for a delivery of 20.7
kg/h the RL 28/1 Model requires the combustion
head to be set to approx. three notches, as
shown in fig. (E).
FAN GATE ADJUSTMENT
The fan gate is set using the indexed selector
1)(G), after having loosened the nut 2)(G).
The first time the burner is fired, this setting
should be left as originally set by the manufactur-
er: notch 2, see fig. (G).
2 mm
÷4 mm
3.5
(A)
(C)
COMBUSTION HEAD SETTING
(G)
(E)
Notches nr.
Light oil delivery
kg/h
(D)
(F)
(B)
D460
D591
D462
D592
D593
D3263
D589
