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5.11
Light oil supply
5.11.1 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.
The tank higher than the burner A (Fig. 19)
The distance "P" must not exceed 10 meters in order to avoid
subjecting the pump's seal to excessive strain; the distance "V"
must not exceed 4 meters in order to permit pump self-priming
even when the tank is almost completely empty.
The tank lower than the burner B (Fig. 19)
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.
D3513
Key to layout (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 =
Rapid closing manual valve remote controlled (only Italy)
8 = On/off solenoid valve (only Italy). See layout of electric
panel board. Electrical connections set by installer (SV)
9 = Return line
10 = Check valve (only Italy)
5.11.2 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 goes to feed 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.
20010950
Installation
H (m)
4
3,5
3
2.5
2
1.5
1
0,5
0
-0,5
-1
-1,5
-2
-2,5
-3
5.11.3 Hydraulic connections
The pumps are equipped with a by-pass that connects return line
with suction line.
The pumps 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 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.
Fig. 19
Install the hoses where they cannot be stepped on or come into
contact with hot surfaces of the boiler and where they do not
hamper the opening of the burner.
Now connect the other end of the hoses to the suction and return
lines by using the supplied nipples.
20
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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