11
STESkW ed 05/06 EOLO Star 23 kW
Technical Documentation
Technical Documentation
(from serial number 3078555)
e negative pressure point (9) is connected to a Y-shaped
pipe (11) which, in turn, is connected to the negative pres-
sure point of the flue pressure switch (5) and to the pressure
point (4)on the fan.
e positive pressure point (10) is connected directly to the
inside of the sealed chamber.
Flue pressure switch (5).
(until serial number 3078554)
It is located at the top, inside the sealed chamber and, by means
of the relative points, measures the difference in pressure be-
tween the outlet of a Venturi tube fitted on the fan exhaust
(negative signal) and the inside of the sealed chamber itself
(positive signal).
e signal measured by the pressure switch varies according
to the length of the intake/exhaust ends and can be measured
by the relative pressure points located at the top of the sealed
chamber (9-10).
When the switch trips it causes a contact (S6) to close which
controls the integrated circuit, enabling or preventing burner
ignition.
Flue pressure switch
triggering pressures
ON
Pa (mm H
2
O)
OFF
Pa (mm H
2
O)
EOLO Star 23 kW 150 (15.3) 130 (13.26)
(from serial number 3078555)
It
is located at the top, inside the sealed chamber and, by
means of the relative points, measures the difference in pressure
between the fan output (negative signal) and the inside of
the sealed chamber itself (positive signal).
e signal measured by the pressure switch varies according
to the length of the aspiration/exhaust terminals and can be
measured by the relative pressure points located at the top of
the sealed chamber (9-10).
When this switch trips it causes a contact (S6) to close that
acts on the integrated board, enabling or preventing burner
ignition.
Flue pressure switch
triggering pressures
ON
Pa (mm H
2
O)
OFF
Pa (mm H
2
O)
EOLO Star 23 kW 44 (4.5) 36 (3.7)
Fan (3).
e extractor works downstream from the combustion cham-
ber and is secured vertically to the top of the hood (2) from
which it extracts the fumes, conveying them to the exhaust
pipes to which the boiler is connected. At the same time it
guarantees the flow of air inside the sealed chamber.
It is controlled by the integrated board and its operation ba-
sically coincides with that of the burner.
(until serial number 3078554)
A Venturi tube is fitted inside its exhaust outlet and the
flue pressure switch’s (5) negative signal is measured at its
outlet.
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