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5.12
Light oil supply
Explosion danger due to fuel leaks in the
presence of a flammable source.
Precautions: avoid knocking, attrition, sparks and
heat.
Make sure the fuel shut-off valve 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.
ATTENTION
5.12.1 Double-pipe circuit
The burner is equipped with a self-priming pump which is capable
of feeding itself within the limits listed in the table at the side.
Tank higher than burner A (Fig. 19)
Distance P must not exceed 10 meters in order to avoid straining
the pump's seal; distance V must not exceed 4 meters in order to
allow the self-priming of the pump even when the tank is almost
empty.
Tank lower than burner B (Fig. 19)
The pump depression value must not exceed 0.45 bar (35 cm
Hg). Because at higher levels gas is released from the fuel; the
pump becomes noisy and its lifetime is shortened.
It is good practice to ensure that the return and suction lines enter
the burner from the same height; the suction line is more difficult
to disconnect.
5.12.2 Loop circuit
The loop circuit is composed of a duct starting from the tank and
going back to it, in which an auxiliary pump makes the
pressurised fuel flow.
A branch from the loop supplies 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 the table.
H (m)
10
4
14
3.5
13
3
12
2.5
11
2
10
1.5
9
1
8
0.5
7
0
6
-0.5
5
-1
4
-1.5
3
-2
-2.5
-3
20148124
Installation
L (m)
Ø (mm)
12
14
16
30
55
95
28
52
89
26
48
82
24
44
76
22
41
70
20
37
63
18
33
57
16
29
51
14
26
44
12
22
38
10
18
32
8
15
25
6
11
19
4
7
13
4
7
Tab. K
D3513
Key (Fig. 19)
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). See electrical layout.
Connections to be carried out by the installer (SV).
9 = Return line
10 = Check valve (Italy only)
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. 22).
It is therefore necessary to connect both hoses to the pump.
The pump will break down immediately if it is run with the return
line closed and the by-pass screw inserted.
Remove plugs from suction and return connectors of the pump.
Insert the hose connections with the supplied seals into the
connections and screw them down.
During the installation, hoses must not be stressed with twisting.
Position hoses so that they cannot be stepped on or get into
contact with hot parts of the boiler and so that they allow burner
opening.
Connect, finally, the other end of the flexible hoses to the suction
and return lines using nipples supplied with the equipment.
20
GB
Fig. 19
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