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5.12.3 Hydraulic connections
The pumps are equipped with a by-pass that connects return line
with suction line.
They are installed on the burner with the by-pass closed by screw
6)(Fig. 29).
It is necessary to connect both flexible hoses to the pump
(Fig. 28). The pump will break down immediately if it is run with
the return line closed and the by-pass screw inserted.
Remove the plugs from the suction and return connections of the
pump.
Follow the instructions below:
Tighten the flexible hoses with the supplied
gaskets.
Take care that the hoses are not stretched or
WARNING
WARNING
twisted during installation.
Place the pipes so that they are not crushed
or are in contact with hot parts of the boiler
and so it is possible to open the burner.
Finally, connect the other end of the flexible
hoses to the suction and return pipes.
5.13 Burner start-up
The working valve closes, the motor starts.
The pump 3)(Fig. 29) draws fuel from the tank through the
pipe 1) and pushes it under pressure to the outlet.
The piston 4) rises and the fuel returns to the tank through
the piping 5) - 7). The screw 6) closes the by-pass towards
the suction line and the solenoid valves 8)-9)-2)-15), de-
energised, closing the path towards the nozzle.
The damper and the pressure regulator are set to minimum
output.
Ignition electrode emits a spark.
Solenoid valves 8) -9) -16) -17) open, the fuel passes into
the pipe 10) and through the nozzle 11), exits the nozzle pul-
verized, and in contact with the spark, ignites: flame at low
output level.
The remaining fuel passes through the pipe 12) at the pres-
sure regulated by the regulator 13), then through the pipe 7),
returns into the tank.
The starting cycle comes to an end.
Key (Fig. 29)
1
Pump suction
2
Filter
3
Pump
4
Pressure adjuster
5
Pressure test point
6
Bypass screw
7
Pump return line
8
Safety valve
9
Working valve
10 Delivery line
11 Nozzle
12 Return line
13 Pressure adjuster
14 Pressure adjustment eccentric
15 Maximum oil pressure switch
16 Return valve
17 Return valve
M
Pressure gauge
V
Vacuometer
Installation
20121613
D1231
27
GB
Fig. 28
Fig. 29
20121288
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