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Technical Documentation
Fume circuit.
Operation.
The products of combustion, after investing the water-
gas exchanger (3), are conveyed to a draught diverter
(5) on top of which the fume 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 fume extraction is controlled by a special
pressure switch (4), the operation of which enables or
prevents the burner from igniting.
Fume pressure switch (4).
Positioned in the top inner part of the sealed chamber
and detects, by means of special pressure points, the
difference in pressure between the top of the draught
diverter (the point where the extractor is positioned
and operates) and the inside of the sealed chamber.
Operation of this switch causes a microswitch (S3) to
close. This affects the adjustment board and either
enables or prevents burner ignition.
Fan (1).
The extractor operates downstream of the combustion
chamber and is fitted vertically in the top part of the
draught diverter (5) from which it extracts the fumes
and conveys these into the exhaust pipes to which the
boiler is connected.
STCS ed 07/02
Technical Documentation
It is controlled by the adjustment board and its
operation coincides with that of the burner.
8
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