13
20115639
GB
Hydraulic systems
6.2
One pipe system
Pressurised one pipe systems (Fig. 10) 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. 11
) have a negative fuel pres-
sure (depression) on intake to the burner.
Usually the tank is lower than the burner.
6.2.1
Priming pump
On the system in Fig. 10 it is sufficient to loosen the plug of the
vacuum gauge 6)(Fig. 9) and wait until the fuel flows out.
On the system in
Fig. 11
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.
Tab. C
Tab. D
H
difference of level
L
max. 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.
CAUTION
You are advised to use additional filters on the fuel
supply line.
Riello recommends a good quality fuel filter at the
tank (Fig. 10 -
Fig. 11
) and a secondary filter
(60
for gas oil and 15
for kerosene) are used
to protect the burner pump and nozzle from con-
tamination.
WARNING
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.
H
metres
L metres
I.D. (8 mm)
I.D. (10 mm)
0.5
10
20
1
20
40
1.5
40
80
2
60
100
H
max. 4 m
m
in
. 0.1 m
D11009
Fig. 10
H
metres
L metres
I.D. (8 mm)
I.D. (10 mm)
0
35
100
0.5
30
100
1
25
100
1.5
20
90
2
15
70
3
8
30
3.5
6
20
H
max. 4 m
D11010
Fig. 11
H
