Light Oil Supply - Riello RL 70/M Installation, Use And Maintenance Instructions

6.12

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.
WARNING
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
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
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.
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 dis-
tance and/or height difference are higher than the values listed in
Tab. H.
Installation
+ H
- H
(m)
10
+ 4.0 51
+ 3.0 45
+ 2.0 39
+ 1.0 32
+ 0.5 29
0 26
- 0.5 23
- 1.0 20
- 2.0 13
- 3.0 7
- 4.0 -
Key
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)
9 = Return line
10 = Check valve (only Italy)
19 GB
L (m)
RL 70/M RL 100/M - 130/M
Ø (mm)
12 14 12
112 150 71
99 150 62
86 150 53
73 144 44
66 132 40
60 120 36
54 108 32
47 96 28
34 71 19
21 46 10
8 21 -
D701
Fig. 19
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
Tab. I
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