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5.7.2
Priming pump
In the system of Fig. 10 just loosen the connection of the vacu-
meter 6)(Fig. 9) and wait for the fuel to come out.
D5741
H
metres
0.5
1
1.5
2
In the systems of Fig. 11 and Fig. 12 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
0
0.5
1
1.5
2
3
3.5
In vacuum systems (Fig. 12) 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.
20119857
L metres
Ø (8 mm)
Ø (10 mm)
10
20
20
40
40
80
60
100
L metres
Ø (8 mm)
Ø (10 mm)
35
100
30
100
25
100
20
90
15
70
8
30
6
20
Installation
D1842
Fig. 10
D5740
Tab. B
H
= Difference of level
L
= Maximum suction line length
Ø
= Inner diameter of the pipe
Tab. C
12
GB
Fig. 11
Fig. 12
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