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18
AST 14 C 152/00
4.3 GAS VAL VE ADJUSTMENT
Remove the gas inlet pressure check screw by
means of a small screwdriver, and connect a
manometer in order to verify correct pressure
from the network;
connect a manometer to the gas outlet pressure
check after removing the screw of the gas outlet
check by means of a small screwdriver;
start the boiler in CH mode and to max output
(see paragraph 4.4 “Chimney sweep function);
remove the plastic protective cap A, act on
screw C clockwise to increase pressure and
counter-clockwise to decrease it (fully turn the
screw clockwise in LPG fuelled boilers);
after adjusting max pressure, disconnect the blue coil wire in order to operate the boiler
at minimum output;
adjust minimum pressure by acting on the internal screw of the gas (while holding still
the external screw);
check correct operation of the burner verifying that the ignition is proper and quiet, act
on PACC trimmer of the electronic board when necessary in order to adjust ignition
power (clockwise to increase, anti-clockwise to decrease);
check for gas leaks;
seal once more the cap screw;
once the above procedure is complete, fill in the tag enclosed with the kit and affix it to
the side of the technical data label of the boiler.
4.4 “CHIMNEY SWEEP” FUNCTION
The boiler has a “chimney sweep” function in order to
test boiler combustion efficiency and to adjust the
burner.
Set the boiler selector knob to WINTER mode and
the room thermostat to ON (if available). While the
boiler is operating, press the SPA button with a
pointed tool (A in the picture below); the boiler will
turn OFF and then resume ignition sequence and
proceed operating with a maximum output.
The “Chimney sweep” function running time is 15 minutes.
In order to deactivate the “chimney sweep” function, turn the selector to any position other
than WINTER.
