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5.9
Nozzle installation
5.9.1
Choice of nozzles
The burner complies with the emission requirements of the EN
267 standard.
In order to guarantee that emissions do not vary, recommended
and/or alternative nozzles specified by Riello in the Instruction
and warning booklet should be used.
It is advisable to replace nozzles every year
during regular maintenance operations.
WARNING
The use of nozzles other than those specified by
Riello S.p.A. and inadequate regular maintenance
may result into emission limits non-conforming to
CAUTION
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 nonobservance of
the requirements contained in this manual.
Choose the couple of nozzles among those given in Tab. E and
Tab. F.
Use nozzles with a 60° spray angle at the recommended pres-
sure.
When the burner fires only the first nozzle works. Its delivery is
higher than that of the second nozzle 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 stabilisation is still satisfactory.
Subsequently also the second nozzle starts working.
The burner's operating delivery consists of the sum of the two
nozzles deliveries.
5.9.2
Nozzles recommended
Model
Gas oil and Kerosene
RL 34/1 MZ
Danfoss 60° S - B - H
Delavan 60° A
Table nozzles - gas oil
GPH
1°
2°
10 bar
1.25
+
1.00
8.3
1.50
+
1.00
9.2
1.75
+
1.00
10.1
2.00
+
1.00
11
2.25
+
1.50
13.8
2.75
+
1.75
16.6
3.00
+
2.00
18.4
3.00
+
2.50
20.2
3.00
+
3.00
22
4.00
+
2.75
24.8
4.00
+
3.00
27.6
5.50
+
2.50
29.4
We get the indicated delivery when both nozzles are working and gas
(1)
oil has the following characteristics: density 0.84 kg/dm
4.2 cSt/20 °C - temperature 10 °C.
6426
Installation
kg/h
(1)
12 bar
14 bar
9
9.9
10.8
11.3
11
12.1
12.5
13.2
15.2
16.5
18.2
19.9
21.2
22.1
22.3
24.3
24.4
26.5
27
29.8
30
33
32.5
35.3
Tab. E
3
- viscosity
16
Table nozzles - kerosene
GPH
1°
2°
7 bar
1.75
+
1.25
8.1
2.00
+
1.25
8.8
2.50
+
2.00
12.2
3.00
+
2.00
13.6
3.00
+
2.50
14.9
3.50
+
3.00
17.7
3.50
+
3.50
19
3.75
+
3.75
20.4
4.00
+
4.00
21.7
4.50
+
4.00
23.1
5.00
+
4.00
24.5
5.00
+
4.50
25.8
5.50
+
4.50
27.5
We get the indicated delivery when both nozzles are working and gas
(1)
oil has the following characteristics: density 0.81 kg/dm
1.6 cSt/20 °C - temperature 25 °C.
5.9.3
Nozzle assembly
At this stage of installation the burner is still disassembled from
the blast tube; it is therefore possible to fit two nozzles with the
box spanner 1)(Fig. 11) (16 mm).
After having removed the plastic plugs 2)(Fig. 11), 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
WARNING
seat.
The nozzle must be screwed into place tightly but not to the max-
imum torque value provided by the wrench.
GB
kg/h
(1)
8 bar
9 bar
8.8
9.3
9.5
10.1
13.1
14
14.6
15.6
16
17.1
19
20.2
20.5
21.8
21.9
23.3
23.4
24.9
24.8
26.4
26.3
28
27.8
29.5
29.5
31.5
3
D458
10 bar
9.9
10.7
14.8
16.4
18.1
21.4
23
24.7
26.4
28.2
29.7
31.3
40
Tab. F
- viscosity
Fig. 11
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