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5.6
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 the nozzle once a year
during periodical maintenance.
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
the values set forth by the regulations in force, and
in extremely serious cases, into potential hazards
to people and objects.
CAUTION
The manufacturing company shall not be liable for
any such damage arising from non-observance of
the requirements contained in this manual.
Loosen the screws 2) and take out the flame stabiliser unit
1), remove the plastic plug 3) and fit the nozzle (Fig. 11).
Make sure that the electrodes are placed as in Fig. 12.
Then put the burner 4) back on the slide bars 3) and slide it
up to the flange 5), keeping it slightly raised to prevent the
flame stabiliser unit from pushing against the guide tabs 6) of
the blast tube (Fig. 13).
Tighten the screws 2) on the slide bars 3) and the screw 1)
that fixes the burner to the flange (Fig. 13).
Whenever the nozzle needs changing when the burner is
already applied to the boiler, open the burner on the slide
bars as in Fig. 10 on page 14 and proceed as described
above.
Do not use any sealing products such as gas-
kets, sealing compound, or tape.
Be careful to avoid damaging the nozzle seal-
ing seat.
WARNING
The nozzle must be screwed into place tightly
but not to the maximum torque value pro-
vided by the wrench.
The nozzle supplied can be used if adapted to the
required flow rate, otherwise it should be replaced
with a nozzle that has a flow rate that is suited to
the system.
WARNING
Installation
D1752
1
2
5.6.1
Recommended nozzle
The nozzle is selected from those indicated in the table (Tab. F).
Use nozzles with a hollow cone or semi hollow spray angle of 60°.
In the event of humidity caused by narrow combustion chambers
use nozzles with a full cone spray angle of 45°.
GPH
8 bar
2.25
7.4
2.50
8.2
3.00
9.9
3.50
11.5
4.00
13.2
4.50
14.8
5.00
16.5
5.50
18.1
6.00
19.8
6.50
21.4
Light oil: density 0.84 kg/dm3 - viscosity 4.2 cSt/20 °C - tem-
(1)
perature 10 °C
15
GB
3
4
5
Kg/h
(1)
11 bar
14 bar
17 bar
8.8
10.0
11.1
9.8
11.2
12.4
11.8
13.4
14.8
13.7
15.6
17.3
15.7
17.8
19.8
17.6
20.1
22.2
19.6
22.3
24.7
21.5
24.5
27.2
23.5
26.8
29.7
25.5
29.0
32.0
Fig. 11
D1753
Fig. 12
20156731
Fig. 13
20 bar
22 bar
11.9
12.4
13.4
14.0
16.1
16.8
18.8
19.8
21.5
22.6
24.0
25.1
26.8
28.1
29.5
30.9
32,2
33,7
34.5
36.0
Tab. F
20156111
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