Light Oil Supply; Loop Circuit - Riello RLS 70 Installation, Use And Maintenance Instructions

5.10

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
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. 20)
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.
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 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.

5.10.1 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 Tab. I.
20148653
Installation
+/- H
[m]
4,0
3,0
2,0
1,0
0,5
0
-4,0
-3,0
-2,0
-1,0
-0,5
7
10
9
6
7
6
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
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 (Italy only)
22 GB
L [m]
Ø [mm]
12 14
24 46
21 40
18 35
15 28
13 26
12 23
- -
- 6
5 12
8 17
10 20
5
A
8
4
5
3
9
B
16
80
70
60
51
46
41
-
12
21
31
36
Tab. I
D1178
1
2
Fig. 20