Immergas Super CAESAR Manual page 8

Technical Documentation
Fumes circuit.
Operation.
The products of combustion, after hitting the water-gas ex-
changer (3), are conveyed to a draught diverter (5) on top of
which the fumes extractor (fan) (1) is fitted.
Fan operation ensures forced expulsion of the fumes and, at
the same time, creates a vacuum in the sealed chamber (2) so
the combustion air can be extracted from outside.
Correct fumes extraction is controlled by a differential pres-
sure switch (4), the operation of which enables or prevents the
burner from igniting.
Flue pressure switch (4).
Positioned in the top inner part of the sealed chamber, it
detects, by means of special pressure points, the pressure
difference between fan output and the inside of the sealed
chamber.
Triggering of this switch causes a contact (S6) to close. This
affects the integrated board and either enables or prevents
burner ignition.
Pressures at which the flue
pressure switch triggers
Super CAESAR
Fan (1).
The extractor operates downstream from the combustion
chamber and is fitted vertically in the top part of the draught
diverter (5).
The fan extracts the fumes and conveys them into the exhaust
STSC ed 09/04
ON OFF
Pa (w.c. mm) Pa (w.c. mm)
52 (5.3) 42 (4.3)
Technical Documentation
pipes to which the boiler is connected.
The fan guarantees the flow of air inside the sealed chamber
at the same time.
It is controlled by the integrated board and its operation co-
incides with that of the burner.
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Super CAESAR