17
Fig. 6
Keys
EV
Light oil solenoid valve
M Pressure
gauge
P Pump
Choice of the oil nozze – Single stage burners
Nozzle
size(GPH)
10 bar
12 bar
14 bar
GPH kg/h
kcal/h
kW
kg/h
kcal/h
kW
kg/h
kcal/h
kW
1.50 5.70
58.000
67.3
6.24
63.600 73.9 6.75 69.000 80.1
1.65 6.27
64.000
74.4
6.86
69.900 81.3 7.42 76.000 88.3
1.75 6.65
68.000
79
7.28
74.200 86.3 7.87 80.000 93
2.00 7.60
77.500
90.1
8.32
84.800 98.6 8.99 92.000 106.9
2.25 8.55
87.200
101.4
9.36
95.400 111 10.12
103.000 119.7
2.50 9.50
97.000
112.8
10.40
106.000 123.3 11.24 115.000 133.7
3.00 11.40
116.000
134.9
12.48
127.200 148 13.49 137.000 159.3
3.50 13.30
135.800
157.9
14.56
148.750 173 15.74 160.700 186.9
4.00 15.20
155.200
180.4
16.65
170.000 197.7 17.99 183.700 213.6
4.50 17.10
174.600
203
18.73
191.250 222.4 20.24 206.650 240.3
Tab. 1
Double-stage burners
The oil flow rate is adusted by choosing the correct nozze (spill-back type) whose size matches the boiler/utilisation input
and by setting the delivery and return pressure according to the values on diagram in Fig. 7.
Setting the light oil pump
Adjust the ignition stage of the pump, to 8 bar (first stage). After 10 seconds, the control box switches to the second stage:
the pump setting must be fixed to 24 bar, by means of the adjusting screw (see paragraph “Light oil pumps).
NOTE: The nozzle oil rate at 8 bar, must be higher than the oil rate at the minimum burner output.
Fig. 7
Governor (2nd stage)
Governor (1st stage)
1st stage: 8 bar
2nd stage: 24 bar