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6.4
One pipe system
Pressurised one pipe systems (Fig. 12) have a positive fuel pres-
sure on intake to the burner.
Usually the tank is higher than the burner, or the fuel pumping
systems are on the outside of the boiler.
Vacuum one pipe systems (Fig. 13) have a negative fuel pressure
(depression) on intake to the burner.
Usually the tank is lower than the burner.
6.4.1
Priming pump
On the system in Fig. 12 it is sufficient to loosen the plug of the
vacuum gauge 6)(Fig. 10) and wait until the fuel flows out.
On the system in Fig. 13 start the burner and wait for the priming.
Should lock-out occur prior to the arrival of the fuel, await at least
20 seconds before repeating the operation.
The installer must ensure that the supply pressure
is not above 0.5 bar.
Above that level, the pump seal is subject to too
much stress.
WARNING
H
metres
I.D. (8 mm)
0.5
1
1.5
2
20163551
Hydraulic systems
D11009
Fig. 12
L metres
I.D. (10 mm)
10
20
20
40
40
80
60
100
Tab. C
H
metres
0
0.5
1
1.5
2
3
3.5
H
difference of level
L
maximum length of the suction line
I.D. internal diameter of the oil pipes
NOTE:
The Tab. C and Tab. D show the maximum approximate lengths
for the supply line, depending on the difference in level, length,
and the diameter of the fuel conduit.
14
GB
D11010
L metres
I.D. (8 mm)
I.D. (10 mm)
35
100
30
100
25
100
20
90
15
70
8
30
6
20
Fig. 13
Tab. D
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