Priming Pump - Riello RDB2.2R BG Instrucciones De Instalación, Montaje Y Funcionamiento

5.7.2

Priming pump

In the system of Fig. 9 just loosen the connection of the vacume-
ter 6)(Fig. 8) and wait for the fuel to come out.
D5741
H
metres
Ø (8 mm)
0.5
1
1.5
2
In the systems of Fig. 10 and Fig. 11 start the burner and wait for
the priming.
Should lockout occur prior to the arrival of the fuel, await at least
20 seconds before repeating the operation.
The pump vacuum should not exceed a maximum of 0.4 bar
(30 cm Hg).
Above that level, gas leaks out from the fuel.
The pipes must all be perfectly sealed.
H
metres
Ø (8 mm)
0
0.5
1
1.5
2
3
3.5
In vacuum systems (Fig. 11) you are advised to bring the return
line to the same height as the suction line.
In this case a non-return valve is not required.
Should however the return line arrive over the fuel level, a non-
return valve is required.
This solution however is less safe than previous one, due to the
possibility of leakage of the valve.
20094184
Fig. 9
L metres
Ø (10 mm)
10 20
20 40
40 80
60 100
Tab. B
L metres
Ø (10 mm)
35 100
30 100
25 100
20 90
15 70
8 30
6 20
Tab. C
Installation
D1842
D5740
H = Difference of level
L = Maximum suction line length
Ø = Inner diameter of the pipe
12 GB
Fig. 10
Fig. 11