Table of Contents
Advertisement
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. 30).
It is necessary to connect both flexible hoses to the pump (Fig. 29).
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
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. 30) 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)-2)-15) open and the fuel passes
through the piping 10) and filter 11) and is then sprayed out
through the nozzle, igniting when it comes into contact with
the spark. flame at low output level. The remaining fuel
passes through the pipe 12) at the pressure regulated by the
regulator 13), then through the pipe 7), returns into the tank.
The starting cycle comes to an end.
Key (Fig. 30)
1
Pump suction
2
Return valve
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
M
Pressure gauge
P
Maximum oil pressure switch
V
Vacuometer
20121303
Installation
D10531
20096849
28
GB
Fig. 29
Fig. 30
Advertisement
Table of Contents
