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5.12
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 the fuel interception tap is closed be-
fore performing any operation on the burner.
The fuel supply line must be installed by qualified
personnel, in compliance with current standards
and laws.
WARNING
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 Tab. F.
Tank higher than burner A (Fig. 20)
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. 20)
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.
Key (Fig. 20)
H = Pump/Foot valve height difference
L = Piping length
Ø = Inside pipe diameter
1 = Burner
2 = Pump
3 = Filter
4 = Manual on/off valve
20124030
2
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 Tab. F.
+/- H
[m]
4.0
3.0
2.0
1.0
0.5
0
-4.0
-3.0
-2.0
-1.0
-0.5
0
3
5
9
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 (only Italy)
22
GB
RLS 1300/EV C11
Ø [mm]
22
24
27
19
33
65
16
28
55
13
23
45
10
18
38
9
16
33
7
13
30
-
-
-
-
-
-
-
-
11
-
9
20
5
11
25
7
13
29
7
10
9
5
6
8
4
7
6
20125164
36
300
260
220
185
165
145
-
30
70
108
125
145
Tab. F
A
B
Fig. 20
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