Adjusting Air And Light Oil Flow Rate; Light Oil Nozzles - Unigas RG515 Manual Of Installation - Use - Maintenance

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).
NOZZLE
BERGONZO A3
FLUIDICS WR2/UNIGAS M3
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).
FLOW RATE kg/h
DIMENSIONS Min
40 13
50 16
60 20
70 23
80 26
90 30
100 33
115 38
130 43
145 48
160 53
180 59
200 66
225 74
250 82
275 91
300 99
330 109
360 119
400 132
450 148
500 165
550 181
600 198
650 214
700 231
750 250
800 267
Tab. 1
NOZZLE SUPPLY
PRESSURE (bar)
20
25
Max
Pressure at nozzle 25bar
40
50
60
70
80
90
100
115
130
Pressure on return
145
160
180
200
225
250
275
300
Up to 100kg/h
330
360
400
450
500 Over 100kg/h
550
600
650
700
750
800
---------------Atomisation angle according to the return pressure
_________ % Flow rate
HIGH FLAME
RETURN PRESSURE (bar)
11 - 13
19 - 20
Fig. 20
20
LOW FLAME
RETURN PRESSURE (bar)
5 (recommended))
7 (recommended)
Pressure at nozzle 357psi
Atomisation angle
Pressure on return
% Flow rate