41
INSTALLER
ENGLISH
FUEL CONNECTIONS
7
6
5
4
3
2
8
1
(*)
ma
x.
4
m
H
H
(*) Automatic shut-off device (only where required).
See the wiring diagram on page 38 for details of
the electrical connections.
1 - Suction
2 - Return
3 - By-pass screw
4 - Pressure gauge fitting
5 - Pressure regulator
6 - Vacuum gauge fitting
7 - Valve
8 - Auxiliary pressure measurement fitting
H
(m)
L
(m)
Øi
(8 mm)
Øi
(10 mm)
0
35
100
0,5
30
100
1
25
100
1,5
20
90
2
15
70
3
8
30
3,5
6
20
THC V E OIL BLU
boilers have their fuel connections at
the rear.
Fuel supply hoses must pass through the gap between
the boiler base and the floor before being connected to
the fuel pump.
If the fuel oil feed system is in negative pressure, the
return line must reach the same height as the suction line.
This avoids having to install a bottom valve, which would
be essential if the return hose were to reach above the
level of the fuel.
b
The installer must ensure that the negative pressure
differential in the fuel oil feed never exceeds 0.4 bar
(30 cm Hg). Over this value the fuel oil will release
gas. Make sure that the fuel oil hoses are perfectly
oil-tight.
b
Clean out the fuel oil tank at suitable intervals.
b
The fuel oil feed line must be suitable for the flow
rate demanded by the burner. The fuel oil feed
system must also be equipped with all the necessa-
ry safety and control devices required by applicable
legislation and standards. Refer to the table alongsi-
de for fuel oil feed line characteristics.
b
A filter must be installed in the fuel oil feed line.
b
Make sure that the fuel oil return line is not kinked
or blocked before starting up the boiler. Excessive
back-pressure can lead to breakage of the pump
seal.
Priming the pump
To prime the pump simply start up the burner and check
for a flame.
If the burner enters lockout before any fuel reaches it,
wait at least 20 seconds then press the “remote burner
reset" button on the control panel and repeat the ignition
procedure until the flame lights.
H
= Head
L
= Maximum length of suction hose
Øi
= Internal diameter of hose
