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5.9
Nozzle installation
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.
5.9.1
Choice of nozzles for 1
Both nozzles must be chosen from among those listed in Tab. E.
The first nozzle determines the delivery of the burner in the 1
stage.
The second nozzle works together with the 1
mine the delivery of the burner in the 2
st
The deliveries of the 1
and 2
the value range indicated on page 9.
Use nozzles with a 60° spray angle at the recom-
mended pressure of 12 bar.
WARNING
As a rule the two nozzles have equal deliveries but the 1
nozzle may have a delivery less than 50% of the total delivery
when a reduction of the counter-pressure peak is desired at the
moment of starting (the burner allows good combustion rates
also with a 40 - 100 % ratio between the 1
Example:
boiler output = 1630 kW - efficiency 90 %
Output required by the burner = 1630 : 0.9 = 1812 kW;
1812 : 2 = 906 KW per nozzle;
therefore, two equal, 60°, 12 bar nozzles are required:
1° = 18 GPH - 2° = 18 GPH,
or the following two different nozzles:
1° = 16 GPH - 2° = 20 GPH.
5.9.2
Nozzle assembly
Remove screw 1)(Fig. 11) and extract the internal part 2).
Fit two nozzles with the box spanner (16 mm) 1)(Fig. 12),
after having removed the plastic plugs 2).
Fitting the spanner through the central hole in the flame sta-
bility disk or loosen screws 1)(Fig. 13).
Remove disk 2)(Fig. 13) and replace the nozzles using the
wrench 3).
Do not use any sealing products such as gaskets,
sealing compound, or tape.
Be careful to avoid damaging the nozzle sealing
WARNING
seat. The nozzles must be screwed into place
tightly but not to the maximum torque value pro-
vided by the wrench.
st
nd
and 2
stage
st
nozzle to deter-
nd
stage.
nd
stages must be contained within
st
nd
and 2
stage).
Installation
GPH
10.0
10.5
11.0
12.0
12.3
13.0
13.8
14.0
15.0
15.3
16.0
17.0
17.5
18.0
19.0
19.5
20.0
21.5
22.0
22.5
23.0
st
23.5
24.0
24.5
25.0
25.5
26.0
26.5
27.0
27.5
28.0
st
stage
17
GB
kg/h
10 bar
12 bar
14 bar
38.4
42.4
40.4
44.6
42.3
46.7
46.1
50.9
47.3
52.2
50.0
55.1
53.1
58.5
53.8
59.4
57.7
63.6
58.8
64.9
61.5
67.9
65.4
72.1
67.3
74.2
69.2
76.4
73.0
80.6
75.0
82.7
76.9
84.8
82.7
91.2
84.6
93.3
101.4
86.5
95.5
103.7
88.4
97.6
106.0
90.4
99.7
108.3
92.2
101.8
110.6
94.2
104.0
112.9
96.1
106.0
115.3
98.0
108.2
117.6
99.9
110.3
119.9
101.9
112.4
122.2
103.8
114.5
124.5
105.7
116.7
126.8
107.6
118.8
129.1
D1146
D1147
kW
12 bar
46.1
502.9
48.4
529.0
50.7
553.9
55.3
603.7
56.7
619.1
59.9
653.5
63.3
693.8
64.5
704.5
69.2
754.3
769.7
70.5
73.8
805.3
78.4
855.1
880.0
80.7
83.0
906.1
87.6
956.0
89.9
980.9
92.2
1005.8
99.1
1081.7
1106.6
1132.6
1157.5
1182.4
1207.3
1233.5
1257.2
1283.2
1308.2
1333.1
1358.0
1384.1
1409.0
Tab. E
Fig. 12
Fig. 13
20035573
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