baltur GI 1000 Serie Mode D'emploi page 44

Fuel and combustion air flow rates remain at maximum until boiler temperature (pressure in the case of a steam
boiler) nears the set value and causes the modulation control motor to invert rotation.
The return movement of the modulation motor causes a reduction in the flow of fuel and relative combustion air.
The modulation system reaches a position of equilibrium which corresponds to a flow of fuel and relative combus-
tion air equal to the quantity of heat requested by the boiler. With the burner working the in-boiler probe detects
variations in boiler load and automatically sends a signal to the modulation motor to adjust the flow of fuel and
relative combustion air accordingly. If, even with just the minimum flow of fuel and combustion air, the maximum
temperature (or pressure in the case of a steam boiler) is reached, the thermostat (pressure switch in the case of
a steam boiler) will shut down the burner completely.
Subsequently, the temperature (or pressure in the case of a steam boiler) will drop back below the shutdown
setting and the burner will re-ignite as described above.
Bear in mind that the possible flow range, with good combustion, is approximately from 1 to 1/3 of the max flow rate
indicated on the ID plate. Should the flame fail to appear within two seconds of the pilot flame igniting, the control
box places the unit in "lock-out" (complete shutdown of burner with relative warning light).
To "reset" the control box press the appropriate reset button.
Note: The air pressure switch must be adjusted on igniting the burner as a function of the pressure value ob-
served for operation with the pilot flame.
HYDRAULIC DIAGRAM OF THE MAGNET ATOMIZING GROUP, MODULATION
SERVOMOTOR, RETURN PRESSURE REGULATOR, AIR GATES REGULATOR
WITH L.P.G. OR NATURAL GAS PILOT BURNER
44
N° 0002900311