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6.3
Two pipe system
Vacuum two pipe systems (Fig. 16) have a negative fuel pres-
sure (depression) on intake to the burner.
Usually the tank is lower than the burner.
The return line should terminate in the oil tank at the same level
as the suction line; in this case a non-return valve is not required.
Should however the return line arrives over the fuel level, the
non-return valve is indispensable. This solution however is less
safe than previous one, due to the possibility of leakage of the
valve.
You are advised to use additional filters on the fuel
supply line.
Riello recommends a good quality fuel filter at the
CAUTION
tank (Fig. 16) and a secondary filter (60 for gas
oil and 15 for kerosene) are used to protect the
burner pump and nozzle from contamination.
In case of Biodiesel use, pay attention to install
Biocompatible filters.
6.3.1
Priming pump
Before starting the burner make sure that the re-
turn pipe-line is not clogged: any obstruction
would cause the pump seals to break.
WARNING
On the system in Fig. 16 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 pump vacuum should not exceed a maximum
of 0.4 bar (30 cm Hg).
Beyond this limit gas is released from the oil.
WARNING
3261
Hydraulic systems
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. D shows the maximum approximate lengths for the sup-
ply line, depending on the difference in level, length, and the di-
ameter of the fuel conduit.
16
GB
D10011
L metres
I.D. (8 mm)
35
30
25
20
15
8
6
Fig. 16
I.D. (10 mm)
100
100
100
90
70
30
20
Tab. D
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