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5.12
Light oil supply
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. 22)
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. 22)
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 suction lines enter
the burner from the same height; in this way it will be less proba-
ble that the suction line fails to prime or stops priming.
20086772
Key (Fig. 22)
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 diagram.
Connections to be carried out by the installer (SVOIL).
9 = Return line
10 = Check valve (only Italy)
20182250
Installation
5.12.2 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 the table.
H (m)
4
3.5
3
2.5
2
1.5
1
0.5
0
-0.5
-1
-1.5
-2
-2.5
-3
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
Fig. 22
6)(Fig. 23 on page 27).
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 the plugs from the suction and return connections of the
pump.
Insert the hose connections with the supplied seals into the con-
nections and screw them down.
Take care that the hoses are not stretched or twisted during in-
stallation.
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.
Connect, finally, the other end of the flexible hoses to the suction
and return lines using nipples supplied with the equipment.
26
GB
L (m)
Ø (mm)
10
12
14
14
30
55
13
28
52
12
26
48
11
24
44
10
22
41
9
20
37
8
18
33
7
16
29
6
14
26
5
12
22
4
10
18
3
8
15
6
11
4
7
4
16
95
89
82
76
70
63
57
51
44
38
32
25
19
13
7
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