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

7

Hydraulic system

7.1

Fuel supply

Double-pipe circuit (Fig. 19)
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.
20024198
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
+ 1.5
+ 1.0
+ 0.5
D701
0
- 0.5
- 1.0
- 1,5
- 2.0
Fig. 19
- 3.0
- 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)
18 GB
L (m)
Ø (mm)
16 18
60 80
50 70
40 60
35 55
30 50
25 45
20 40
18 35
15 30
13 25
10 20
5 10
- 6
Tab. C