3387
14
GB
5.
MAINTENANCE
Disconnect the electric supply to the burner by switching off the main power switch and close the
gas shut-off valve before maintaining or checking the system.
The burner requires scheduled maintenance that must be carried out by qualified personnel and in compli-
ance with local legislation.
Scheduled maintenance is vital for the smooth operation of the burner; it avoids waste of fuel and reduces
harmful emissions into the atmosphere.
THE FUNDAMENTAL OPERATIONS TO CARRY OUT ARE
AS FOLLOWS:
Check at regular intervals that the holes of the gas head
are not obstructed. If they are, clean them with a suitable
tool as shown in the figure 11.
Check there are no occlusions or obstructions in the inlet
or return pipes, in the air suction areas and in the combus-
tion product waste pipe.
Check that the burner and gas train electrical connections
are correct.
Check that the positioning of the air pressure test point is
correct.
Check that the gas train is suited to the burner capacity, the
type of gas used and the network gas pressure.
Check that the positioning of the combustion head is cor-
rect and that it is properly fixed to the boiler.
Check that the air damper is positioned correctly.
Check that the ionisation probe and the electrode are positioned correctly (see Fig. 5).
Check that the air pressure switch and the gas pressure switch are set correctly.
Leave the burner operating in steady state for approx. ten minutes, checking to ensure that all elements
indicated herein have the proper settings for 1
st
and 2
nd
stage.
Then carry out the analysis of the combustion by checking:
CO
2
percentage (%);
CO content (ppm);
NOx content (ppm);
Ionisation current (
μ
A);
Flue gases temperature at the stack.
Fig. 12
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