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5.9
Burner starting
Operating control closes, the ignition pilot starts and the
P.O.C. solenoid valves 16)-17) open (available as accessory),
if required.
The pump 18)(Fig. 38) draws the fuel from the tank through
the piping 1) and pumps it under pressure for delivery.
The pump pressure governor 4) rises and the fuel returns to
the tank through the piping 2). The screw 3) closes the by-
pass heading towards suction and the de-energized solenoid
valves 5) - 6) close the passage to the nozzle.
Air damper and pressure regulator are positioned on MIN out-
put.
Solenoid valves 5) - 6) -13) -14) open; the fuel passes through
16
1
20115946
Key (Fig. 38)
1
Pump suction
2
Pump return line and nozzle return line
3
Pump by-pass screw
4
Pump pressure regulator
5
Safety valve
6
Safety valve
7
Nozzle delivery line
8
Nozzle without interception rod
9
Nozzle return line
10 Pressure variator on nozzle return line
11 Pressure variator servomotor
12 Pressure switch on nozzle return line
13 Safety valve on nozzle return line
14 Safety valve on nozzle return line
15 Pressure switch on pump delivery line
16 POC safety valve
17 POC safety valve
20106891
Start-up, calibration and operation of the burner
C
V
18
17
3
4
2
the piping 19), and enters the nozzle. A part of the fuel is then
sprayed out through the nozzle, igniting when it comes into
contact with the pilot flame: flame at a low output level; the
rest of the fuel passes through piping 20 at the pressure
adjusted by the regulator 10), then, through piping 2), it goes
back into the tank.
The pilot flame goes out.
The starting cycle ends.
19
B
M
6
5
15
P
14
13
P
M
12
18 Oil pump
19 Delivery piping
20 Return piping
21 Check valve (no dripping function)
22 Check valve (no dripping function
B
Oil valve group and pressure variator
C
POC Oil valve group (available as accessory)
M
Pressure gauges
V
Vacuometer connection
NOTE:
The POC (Proof of Closure) valves are required by the NFPA
8501 standard for burners having an output of 12.500 Mbtu/hr
or greater (RLS 310-410-510).
40
GB
7
8
9
21
22
20
M
10
11
M
Fig. 38
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