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5.11.2 Single-pipe circuit
There are two solutions possible:
• Pump external bypass (A, Fig. 19) (recommended)
The two hoses are connected to an automatic degassing unit,
(See "Degassing unit" on page 38.).
The pump bypass screw must not be removed.
• Pump internal bypass (B, Fig. 19)
The pumps are equipped with a screw 6), Layout on Fig. 32,
which is accessible through the return line connector, which
when removed opens the return pipe to the suction line. The
pump return line connector must be plugged.
This solution is possible only with low pump depression values
(max. 0.2 bar) and perfectly-sealed piping.
11
7
5
6
8
4
S8274
A
1
2
5
3
A
Installation
Key (Fig. 18)
H
Pump/Foot valve height difference
L
Piping length
• values calculated for gas oil:
• viscosity = 6 cSt/20°C
• density = 0.84 kg/dm
• temperature = 0°C
• max altitude = 200 m (a.s.l.)
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
+ H
- H
(m)
+ 4,0
+ 3,0
+ 2,0
+ 1,0
+ 0,5
Fig. 18
21
GB
3
L (m)
Ø (mm)
8
10
35
90
30
80
26
69
21
59
19
53
D349
B
12
152
152
152
130
119
Tab. I
Fig. 19
20033097
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