Light Oil Supply; Double-Pipe Circuit; Loop Circuit - Riello RLS 160/M MX Installation, Use And Maintenance Instructions

5.11

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

5.11.1 Double-pipe circuit

The burner is equipped with a self-priming pump which is capable
of supplying itself within the limits listed in the Tab. J.
Tank higher than burner A (Fig. 23)
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. 23)
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.
Key (Fig. 23)
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
20148049
Installation
7
10
9
5
6
8
4
7
6
22

5.11.2 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 Tab. J.
H (m)
12
4 71
3 62
2 53
1 44
0.5 40
0 36
-0.5 32
-1 28
-2 19
-3 10
-4 -
A
1
2
5
3
9
B
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 (SV).
9 = Return line
10 = Check valve (Italy only)
GB
L (m)
Ø (mm)
14 16
138 150
122 150
106 150
90 150
82 150
74 137
66 123
58 109
42 81
26 53
10 25
D2999
Tab. J
Fig. 23