Riello 40 G20D Instrucciones De Instalación, Uso Y Mantenimiento página 20

3.3 FUEL LINES
WARNING: before starting the burner make sure that the return pipe-line is not clogged: any obstruction
would cause the pump seals to break.
WARNING
The pump is supplied for use with a two pipe system.
For use on a one pipe system, it is necessary to remove the by-pass screw (A), (see figure).
D5219
PRIMING THE PUMP
Loosen the plug of the vacuum gauge (5, fig. 1) and wait until the fuel flows out.
H = Difference of level.
L = Max. length of the
suction line.
I.D. = Internal diameter of the
fuel pipes.
D5220
3397
SYSTEM
NOT PERMITTED
IN GERMANY
L meters
H
I. D.
meters
8 mm
0 35
0.5 30
1 25
1.5 20
2 15
3 8
3.5 6
L meters
H
I. D. I.D.
meters
8 mm 10 mm
0.5 10 20
1 20 40
1.5 40 80
2 60 100
The pump vacuum should not exceed a maxi-
mum of 0.4 bar (30 cm Hg).
Beyond this limit gas is released from the fuel.
I.D.
Fuel lines must be completely airtight.
10 mm
The return line should terminate in the fuel
tank at the same level as the suction line;
100
in this case a non-return valve is not required.
100
When the return line arrives over the fuel
100
level, a non-return valve must be used.
90
This solution however is less safe than previ-
70
ous one, due to the possibility of leakage of
30
the valve.
20
PRIMING THE PUMP
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.
WARNING:
Check periodically the flexible pipes condi-
tions. Using kerosene, they have to be
replaced at least every 2 years.
A filter must be installed on the suction
fuel line.
5
GB
A
D5809