20035745
20
GB
Installation
5.12.3 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. 17) and then
screw the plug 7).
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 4)(Fig. 18) in order to
bleed off the air contained in the suction line and wait until the fuel
flows out.
Key (Fig. 16)
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
Tab. H
5.13
Hydraulic connections
The pumps are equipped with a by-pass that connects return line
and suction line. The pumps are installed on the burner with the
by-pass closed by screw 6)(Fig. 17).
It is therefore necessary to connect both hoses to the pump. The
pump will break immediately if it is run with the return line closed
and the by-pass screw inserted.
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.
Install the hoses where they cannot be stepped on or come into
contact with hot surfaces of the boiler and where they do not
hamper the opening of the burner.
Now connect the other end of the hoses to the suction and return
lines by using the supplied nipples.
5.14
Hydraulic system layout
Key (Fig. 17)
1
Pump suction
2
Filter
3
Pump
4
Pressure governor
5
Return pipe
6
By-pass screw
7
Pump return
8
Safety solenoid
9
1
st
stage valve
10 2
nd
stage valve
11 Filter
M Pressure gauge
V
Vacuometer
+/- H
(meters)
L (meters)
Ø 16 (mm)
Ø 18 (mm)
+ 4.0
60
80
+ 3.0
50
70
+ 2.0
40
60
+ 1.5
35
55
+ 1.0
30
50
+ 0.5
25
45
10 c
m
V
H+
P
2
3
5
4
8
5
7
6
1
11
Fig. 16
D11169
WARNING
Take care that the hoses are not stretched or
twisted during installation.
Fig. 17
D3252
