The pump vacuum should not exceed
a maximum of 0.4 bar (30 cm Hg).
Beyond this limit gas is released from
the oil.
Oil lines must be completely air-
tight. The return line should termi-
nate in the oil tank at the same level
as the suction line; in this case a
non-return valve is not required.
When the return line arrives over the
fuel level, a non-return valve must be
used.
This solution however is less safe than
previous one, due to the possibility of
leakage of the valve.
PRIMING THE PUMP
Start the burner and wait for the prim-
ing. Should lock-out occur prior to the
arrival of the fuel, await at least 20 sec-
onds before repeating the operation.
A filter must be installed on the suction fuel line.
H
meters
Lmeters
I. D.
8 mm
I.D.
10 mm
0.5
1
1.5
2
10
20
40
60
20
40
80
100
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).
A
H
meters
Lmeters
I. D.
8 mm
I.D.
10 mm
0
0.5
1
1.5
2
3
3.5
35
30
25
20
15
8
6
100
100
100
90
70
30
20
H max. 4 m
H
H
max. 4 m
min. 0.1 m
D5219
D5220
D5199
H =Difference of level.
L =Max. length of the
suction line.
I.D.=Internal diameter of the
oil pipes.
PRIMING THE PUMP
Loosen the plug of the vacuum gauge (5, fig. 1,
page 1) and wait until the fuel flows out.
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