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5.9
Nozzle installation
5.9.1
Choice of nozzles for 1
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.
The nozzle must be chosen from among those listed in (Tab. F).
Use nozzle with atomization angle of 60° and, if possible, at a
pressure of 12 bar.
Delivery kg/h (1)
Nozzles
60° - GPH
10 bar
2.00
7.7
2.25
8.6
2.50
9.6
3.00
11.5
3.50
13.5
4.00
15.4
We get the indicated delivery when both nozzles are work-
(1)
ing and gas oil has the following characteristics:
3
density 0.84 kg/dm
- viscosity 4.2 cSt/20 °C - temperature
10 °C
Example:
Boiler output = 270 kW - efficiency 90 %
Output required by the burner =
270 : 0.9 = 300 kW;
300 : 2 = 150 kW per nozzle;
therefore, two equal, 60°, 12 bar nozzles are required:
1° = 3.00 GPH - 2° = 3.00 GPH,
or the following two different nozzles:
1° = 2.50 GPH - 2° = 3.50 GPH, or
1° = 3.50 GPH - 2° = 2.50 GPH.
st
nd
and 2
stage
12 bar
12 bar
14 bar
8.5
9.2
100.8
9.5
10.4
112.7
10.6
11.5
125.7
12.7
13.8
150.6
14.8
16.1
175.5
17.0
18.4
201.6
Installation
5.9.2
Nozzle
The spray patterns in relation to the leading brands of nozzle on
sale are shown in (Tab. G).
The nozzle deliveries indicated in the Tab. F are the rated values.
In reality, the delivery may differ by +/- 10% due to the reasons
below:
• tolerance values indicated by the manufacturer;
• temperature variation:
delivery decreases with a rise in temperature and vice-versa;
• variations in fuel viscosity: delivery decreases with a decrease
of viscosity and vice-versa.
A burner's exact delivery can only be determined by weighing.
Suck the fuel from a recipient mounted on a weighing machine,
or attach hoses to the nozzles and weigh the fuel that flows out.
A liter counter can be applied to the pump's suction line if a sin-
gle-pipe supply system has been provided.
NOTE:
Nozzle manufacturers discourage opening of the nozzle to
clean its internal parts and especially its calibrated hole. The
filter, on the other hand, may be cleaned or replaced as re-
quired. Grip the nozzle on its hexagonal part when handling.
Spray
kW
hollow
solid
universal
semi-solid
Tab. F
17
GB
Delevan Monarch Danfoss Steinen
A
PL
H
B
AR
S
W
NS - PLP
B
E
R
-
H - PH
Q
SS
S
Tab. G
20033097
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