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6.1.3
Single-pipe circuit
In order to obtain single-pipe working it is necessary to unscrew
the return hose, remove the by-pass screw 6)(Fig. 20) and then
screw the plug 7)(Fig. 20).
The distance "P" must not exceed 10 meters in order to avoid
subjecting the pump's seal to excessive strain; the distance "V"
must not exceed 4 meters.
For the priming pump loosen the screw 3)(Fig. 22) in order to
bleed off the air contained in the suction line and wait until the fuel
flows out.
Key (Fig. 19)
H Pump/Foot valve height difference
L Piping length
ø Inside pipe diameter
1
Burner
2
Pump
3
Filter
4
Manual on/off valve
5
Suction line
6
Foot valve
7
Rapid closing manual valve remote controlled (only Italy)
8
On/off solenoid valve (only Italy)
11 Tank filter
6.2
Hydraulic system layout
6.3
Hydraulic connections
The pumps are equipped with a by-pass that connects return line
with suction line. The pumps are installed on the burner with the
by-pass closed by screw 6)(Fig. 20).
It is therefore necessary to connect both hoses to the pump.
The pump will break down immediately if it is run
with the return line closed and the by-pass screw
inserted.
WARNING
6426
Hydraulic system
D601
Fig. 20
20
11
7
6
D11075
+/- H
(meters)
ø 8 mm
+ 4.0
51
+ 3.0
45
+ 2.0
39
+ 1.0
33
+ 0.5
29
Key (Fig. 20)
1
Pump suction
2
Filter
3
Pump
4
Pressure governor
5
Return pipe
6
By-pass screw
7
Pump return
8
Solenoid valve
9
Piping
10 Filter
11 Solenoid valve
13 Piping
14 Filter
M
Pressure gauge
V
Vacuometer
Remove the plugs from the suction and return connections of the
pump.
Insert the hose connections with the supplied seals into the con-
nections and screw them down.
Take care that the hoses are not stretched or
twisted during installation.
WARNING
GB
A
5
1
8
4
5
3
L (meters)
ø 10 mm
ø 12 mm
100
100
95
80
72
2
Fig. 19
100
100
100
100
100
Tab. H
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