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6.11.3 Pressure adjustment
For 394T1 - 397T1 - 380T1 burners
1st stage adjustment:
The pump leaves the factory set at 9 bar.
If necessary, recalibrate the pressure using the screw 7) Fig.
19.
The pressure gauge for checking pressure should be fitted
in place of the plug 8) Fig. 19.
2nd stage adjustment:
The pump leaves the factory set at 14 bar.
If necessary recalibrate the pressure, or if you prefer change
it, just turn the screw 9) Fig. 19.
The pressure gauge for checking pressure should be
assembled in place of the plug 8)Fig. 19.
For 398T1 burners
It leaves the factory set at 12 bar.
If necessary recalibrate the pressure, or if you prefer change
it, just turn the screw 9)(Fig. 19).
The pressure gauge for checking pressure should be
assembled in place of the plug 8)(Fig. 19).
All manuals and user guides at all-guides.com
Installation
S9658
Fig. 19
21
GB
6.11.4 Pressurised one-pipe systems
Pressurised one-pipe systems (Fig. 20) have a positive fuel pres-
sure on intake to the burner.
Usually the tank is higher than the burner, or the fuel pumping
systems are on the outside of the boiler.
In order to obtain one pipe working it is necessary to unscrew the
return plug 2), remove the by-pass screw 3) and then screw the
plug 2) in again with a tightening torque of 0.5 Nm.
H
metres
0.5
1
1.5
2
H
= Difference of level
L
= Maximum suction line length
Ø
= Inner diameter of the pipe
D5338
L metres
Ø (8 mm)
Ø (10 mm)
10
20
20
40
40
80
60
100
Fig. 20
Tab. G
20135920
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