Hydraulic System; Fuel Supply - Riello RL 190 Installation, Use And Maintenance Instructions

7

Hydraulic system

7.1

Fuel 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
Double-pipe circuit (Fig. 15)
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 of 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.
Hydraulic system
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
the table.
+ H
- H
(m)
+ 4.0
+ 3.0
+ 2.0
+ 1.0
+ 0.5
0
- 0.5
- 1.0
- 2.0
- 3.0
- 4.0
Key
H = Pump/Foot valve height difference
L = Piping length
Ø = Inside pipe diameter
D701
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)
Fig. 15
8 = On/off solenoid valve (only Italy)
9 = Return line
10 = Check valve (only Italy)
15 GB
L (m)
Ø (mm)
12 14
71 138
62 122
53 106
44 90
40 82
36 74
32 66
28 58
19 42
10 26
- 10
16
150
150
150
150
150
137
123
109
81
53
25
Tab. C
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