20
ADJUSTING AIR AND LIGHT OIL FLOW RATE
Light oil nozzles
The light oil flow rate can be adjusted choosing a nozzle that suits the boiler/utilisation output and setting the delivery and return pres-
sure values according to the ones quoted on the chart below and the diagram on Fig. 20 (as far as reading the pressure values, see
next paragraphs).
Example:
as far as over 100kg/h nozzle the 80% of the nozzle rated flow rate is achieved with 18bar return pressure (see Fig. 20).
NOZZLE
NOZZLE SUPPLY
PRESSURE (bar)
HIGH FLAME
RETURN PRESSURE (bar)
LOW FLAME
RETURN PRESSURE (bar)
BERGONZO A3
20
11 - 13
5 (recommended))
FLUIDICS WR2/UNIGAS M3
25
19 - 20
7 (recommended)
Tab. 1
Fig. 20
---------------Atomisation angle according to the return pressure
_________ % Flow rate
FLOW RATE kg/h
DIMENSIONS
Min
Max
40
13
40
50
16
50
60
20
60
70
23
70
80
26
80
90
30
90
100
33
100
115
38
115
130
43
130
145
48
145
160
53
160
180
59
180
200
66
200
225
74
225
250
82
250
275
91
275
300
99
300
330
109
330
360
119
360
400
132
400
450
148
450
500
165
500
550
181
550
600
198
600
650
214
650
700
231
700
750
250
750
800
267
800
Pressure at nozzle 357psi
Pressure on return
Pressure on return
Up to 100kg/h
Over 100kg/h
% Flow rate
Pressure at nozzle 25bar
Atomisation angle