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6.2
One pipe system
Pressurised one pipe systems (Fig. 11) 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. 12) have a negative fuel pres-
sure (depression) on intake to the burner.
Usually the tank is lower than the burner.
You are advised to use additional filters on the fuel
supply line.
Riello recommends a good quality fuel filter at the
CAUTION
tank (Fig. 11 - Fig. 12) and a secondary filter (60
for gas oil and 15 for kerosene) are used to pro-
tect the burner pump and nozzle from contamina-
tion.
In case of Biodiesel use, pay attention to install
Biocompatible filters.
6.2.1
Priming pump
On the system in Fig. 11 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. 12 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
2903443
Hydraulic systems
D11009
Fig. 11
L metres
I.D. (10 mm)
10
20
20
40
40
80
60
100
Tab. B
H
metres
0
0.5
1
1.5
2
3
3.5
H
difference of level
L
max. lenght of the suction line
I.D. interminal diameter of the oil pipes
NOTE:
The Tab. B and Tab. C 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. 12
Tab. C
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