19
INSTALLATION
2.9
Fuel connections
The boiler
INSIEME EVOe K LN
is supplied with two hoses for the
light oil supply to the burner. They must be connected by the
installer.
The light oil supply delivery pipe must be connected directly on
the filter (1) (accessory), the return pipe to the preset union (2).
Make sure that these connections are oil tight.
2
1
A
B
3
Description
INSIEME
EVOe 25
K LN
INSIEME
EVOe 32
K LN
Fittings
2x3/8" M
2x3/8" M
Ø
A
40
25
mm
B
135
mm
If the 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 be located above the level of the fuel.
9
The installer must ensure that the negative pressure differ-
ential in the oil feed never exceeds 0.4 bar (30 cm Hg). If this
value is exceeded, the fuel oil will release gas. Make sure
that the oil hoses are perfectly oil-tight.
9
Clean out the oil tank at suitable intervals.
9
The fuel supply system must be suitable for the burner ca-
pacity and must be equipped with all the safety and control
devices required by the Standards in force. For its size, refer
to the table on page "20" of paragraph "Priming the pump".
9
A filter must be installed in the oil feed line.
9
Before starting the thermal unit, make sure that the return
pipe line is not clogged. An excessive back pressure would
cause the breakage of the circulator seal.
9
On completion of the installation, check that all joints are
sealed.
Priming the pump
To prime the oil 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 turn the function selector to position (II)
"Reset burner" for at least 1 second before returning it to posi-
tion (I). Wait for the burner to complete the entire ignition cycle
again, up to the ignition of the flame.
(*)
m
ax
. 4
m
H
H
(*)
Automatic shut-off device (if fitted). For details of the
electrical connections, see the “Automatic shut-off
device (DAI)” section on page 26.
