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TWO STAGE PROGRESSIVE NATURAL GAS BURNERS
N° 8721/2/GB
GENERAL DIAGRAM FOR TWO-STAGE L.P.G. PRESSURE REDUCTION
FOR BURNER OR BOILER
Rev. 21/03/90
AIR PRESSURE SWITCH
Regulate the air pressure switch after first carrying out all the other burner
adjustments with the air pressure switch adjusted to the start of the scale.
With the burner operating at the requested power level, slowly turn the central
screw clockwise until the burner locks out.
Then give the screw a half-turn anti-clockwise and repeat burner start-up to
check for proper operation. If the burner locks out again give the knob another
half-turn.
IONIZATION CURRENT
The minimum current needed to run the apparatus is 3µA.
The burner provides a significantly higher current and therefore
does not normally require any checks at all. Should however,
the ionisation current need to be measured a microammeter
must be connected in series to the ionization electrode lead
by opening the connector "C" as illustrated in the figure.
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