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5.13
Light oil supply
Explosion danger due to fuel leaks in the pres-
ence of a flammable source.
Precautions: avoid knocking, attrition, sparks and
heat.
Make sure that the fuel interception tap is closed
before performing any operation on the burner.
The fuel supply line must be installed by qualified
personnel, in compliance with current standards
and laws.
WARNING
WARNING
5.13.1 Double-pipe circuit
The burner is equipped with a self-priming pump which is capable
of feeding itself within the limits listed in Tab. M.
Tank higher than burner A (Fig. 28)
Distance "P" must not exceed 10 meters in order to avoid strain-
ing the pump's seal; distance "V" must not exceed 4 meters in or-
der to allow pump self-priming even when the tank is almost
empty.
Tank lower than burner B (Fig. 28)
Pump depression values higher than 0.45 bar (35 cm Hg) must
not be exceeded. Because at higher levels gas is released from
the fuel, the pump starts making noise and its working life-span
decreases. It is good practice to ensure that the return and suc-
tion lines enter the burner from the same height; in this way it will
be less probable that the suction line fails to prime or stops prim-
ing.
5.13.2 The loop circuit
A loop circuit consists of a loop of piping departing from and re-
turning to the tank with an auxiliary pump that circulates the fuel
under pressure.
A branch connection from the loop feeds the burner.
This circuit is extremely useful whenever the burner pump does
not succeed in self-priming because the tank distance and/or
height difference are higher than the values listed in Tab. M.
5.13.3 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)().
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
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.
Installation
7
10
9
6
7
6
20058642
Key to layout (Fig. 28)
H = Pump/Foot valve height difference
L = Piping length
Ø = Inside pipe diameter
1 = Burner
2 = Pump
3 = Filter
4 = Manual on/off valve
5 = Suction line
6 = Foot valve
7 = Quick closing manual valve with remote control (Italy only)
8 = On/off solenoid valve (Italy only).
9 = Return line
10 = Check valve (only Italy)
+/- H
m
+ 4
+ 3
+ 2
+ 1
+ 0.5
0
- 0.5
- 1
- 2
- 3
- 4
25
GB
A
5
8
4
5
3
9
B
L [m]
Ø 12 mm
Ø 14 mm
71
138
62
122
53
106
44
90
40
82
36
74
32
66
28
58
19
42
10
26
-
10
D10531
1
2
Fig. 28
Ø 16 mm
150
150
150
150
150
137
123
109
81
53
25
Tab. M
Fig. 29
20168262
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