10
STESkW ed 05/06
EOLO Star 23 kW
Technical Documentation
Technical Documentation
Flue circuit.
Operation.
The products of combustion, after hitting the water-gas ex-
changer (1) are conveyed to a hood (2) on top of which the
fumes extractor (3) is fitted
(fan)
.
Fan operation ensures the forced expulsion of the fumes and,
at the same time, creates a vacuum in the sealed chamber (6)
so the combustion air can be aspirated from outside.
Correct fume extraction is controlled by a differential fumes
pressure switch (5); when it trips it either enables or prevents
burner ignition.
Air/fumes testing holes (7-8).
On the top of the outside of the sealed chamber are two holes
with screw closing. They are accessible from the front and are
used to sample combustion air (7) and fumes (8).
Signal pressure points, flue pressure switch (9-
10).
On the top of the outside of the sealed chamber are two
pressure points with screw closing. By means of these points
the signal at the ends of the flue pressure switch (5) can be
measured.
(until serial number 3078554)
The negative pressure point (9) is coupled to a Y-shaped pipe
(11) that, in turn, is connected to the negative pressure point
of the flue pressure switch (5)
and to the pressure point at
the outlet of the Venturi tube fitted at the end of the fan
exhaust
.
The positive pressure point (10) is connected directly to the
inside of the sealed chamber.
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