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5.5 THE FUME DISCHARGE SYSTEM
On the external part of the boiler there is a fume discharge collector with two intakes used to detect the
temperature of the combustion gas and of the fresh air inlet , concentrations of O2, CO2, etc.
5.6 AIR PRESSURE SWITCH
The boiler uses a differential pressure switch to check correct evacuation of the fume:
24kW: Off= 50Pa/0,50mbar;
On= 60Pa/0,60mbar;
28kW: Off= 74Pa/0,74mbar;
On= 89Pa/0,89mbar.
The first pressure value is taken on the fan (intake “L” on the air pressure switch).
The second pressure values is taken inside the combustion chamber (intake “H” on the air pressure switch).
Actually two negative pressure values are used ( in relation to the atmospheric pressure) but that counts
most of all for the air pressure switch, is that there is an appropriate pressure difference ( which can be
measured with a differential pressure gauge connected to the two pressure intakes located on the upper side
of the boiler).
Air pressure switch is carried out always during operation. Any “opening” during operation is always
detected.
6 07 : Pressure switch enabled already before the ignition sequence.
6 P1 : Pressure switch enabling missed with fan turned on.
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