(1) We get the indicated delivery when both nozzles are working and light oil has the follow-
ing characteristics: density 0.84 kg/dm
3
- viscosity 4.2 cSt/20 °C - temperature 10 °C
GPH kg/h (1) kW
12 bar
Nozzles
recommended
1° 2° 10 bar 12 bar 14 bar
1.25
1.50
1.75
2.00
2.25
2.50
2.75
3.00
3.00
3.50
3.50
4.00
4.00
+
+
+
+
+
+
+
+
+
+
+
+
+
1.00
1.00
1.00
1.00
1.50
1.75
1.75
2.00
2.25
2.25
2.50
2.75
3.00
8.7
9.7
10.7
12.5
14.4
16.3
17.3
19.2
20.2
22.1
23.0
25.9
26.9
9.7
10.8
11.8
13.9
15.9
18.0
19.1
21.2
22.3
24.4
25.4
28.6
29.7
10.5
11.7
12.9
15.0
17.3
19.6
20.7
23.0
24.2
26.5
27.7
31.1
32.3
115
128
140
164.8
189
213
226
251
264
289
301
339
352
DANFOS 60 ° B
DELAVAN 60° A
DELAVAN 60° W
(A)
(B)
(D)
(E)
(C)
D458
D590
D3869
6
CHOICE OF NOZZLES (A)
The burner complies with the emission require-
ments of the EN 267 standard.
In order to guarantee that emissions do not vary,
recommende
d and/or alternative nozzles speci-
fied by Riello in the Instruction and warning
bookle
t should be used.
Warning: It is advisable to replace noz-
zles every year during regular mainte-
nance operations.
Caution: The use of nozzles other than
those specified by Riello S.p.A. and inad-
equate regular maintenance may result into
emission limit
s 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 manufacturing company shall not be liable
for
any such damage arising from nonobser-
vance of the requirements contained in this
manual.
Choose the couple of nozzles
among those giv-
en in table (A).
Use nozzles with a 60° spray angle at the recom-
mended pressure of 12 bar.
When the burner fires only the first nozzle works.
Its
delivery is higher than that of the second noz-
zle in order to assure a good flame stabilisation
to
the stability disk, though the fan delivery has
been adjusted for both working nozzles.
Whenever ignition takes place with unusual
noise
or pulsations, you should reduce the first
nozzle delivery making sure that the flame stabi-
lisation is still satisfactory.
Subsequently also the second nozzle starts
wor
king.
The burner’s operating delivery consists of the
sum of the two
nozzles deliveries.
Example
Boiler output = 230 kW
Efficiency 90 %
Output required by the burner =
230 : 0,9 = 255 kW
In table (A) the following nozzles are recom-
mended:
1° = 3,0 GPH + 2° = 2,0 GPH - 60° - 12 bar.
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) (B) (16 mm), after having removed the plastic
plugs 2)(B), fitting the spanner through the cen-
tral 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. The nozzle must be
scr
ewed 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. (C)
Make sure that the electrodes are positioned as
shown in fig. (C)
.
Finally remount the burner 4)(D) to the slide
bar
s 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:
- Open the burner on its guides as shown in
fi
g. (C) p.5.
- Remove the nuts 1)(E) and the diffuser disc
as
sembly 2)
- Use spanner 3(E) to change the nozzles.
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