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

Dual fuel gas oil/ gas burners progressive two-stage or modulating operation
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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. M.
Tank higher than burner A (Fig. 28)
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. 28)
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 suc-
tion lines enter the burner from the same height; in this way it will
be less probable that the suction line fails to prime or stops prim-
ing.

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. M.
+/- H
m
Ø 12 mm
+ 4
71
+ 3
62
+ 2
53
+ 1
44
+ 0.5
40
0
36
- 0.5
32
- 1
28
- 2
19
- 3
10
- 4
-
Installation
L [m]
Ø 14 mm
Ø 16 mm
138
150
122
150
106
150
90
150
82
150
74
137
66
123
58
109
42
81
26
53
10
25
Tab. M
27
7
10
9
5
6
8
4
7
6
20058642
Key (Fig. 28)
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 (only Italy)
GB
A
1
2
5
3
9
B
Fig. 28
20121303

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Rls 200/e mx2007392020081721

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