Air Regulation On The Combustion Head; Use Of The Burner - baltur SPARKGAS 20P - 20PW Mode D'emploi

8) N.B. On some burner models, the thermostat of the 2nd flame must be at 2 contacts (in exchange); please do
refer to the eletric diagram of the specific burner, in case you haven't the thermostat in exchange at two
contacts, please do refer to the diagram 0002050151. With the burner switched off at the general switch,
switch on the second flame thermostat and set it by adjusting the control on the servo so that the air shutter
opening is at the appropriate level for the second flame (see 0002932130). Open the gas flow regulator on the
valve to archive the appropriate delivery rate for the second flame (main flame).
9) Switch off the general switch to start up the burner. When the has started up it is necessary to check as
previously shown, the gas delivery and the combustion with the appropriate instruments. When the results are
known, necessary, proceed with varying the gas delivery and relative combustion air in order to adapt delivery
to that required for the specific case (boiler potentiality). It's also necessary to check if the CO
are adequate (CO max. = about 10% for methane gas and CO = 0.1%).
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10) Control the efficiency of the safety devices: the "shut down" (by detaching the ionisation electrode cable), the
air pressure switch, the gas pressure switch, the gas pressure switch and the thermostats).

AIR REGULATION ON THE COMBUSTION HEAD

The combustion head is equipped with a regulating device which closes and opens the air passage between the disk
and the head. By closing the passage it's possible to achieve high pressure upstream the disk for low inputs as well.
High velocity and turbulence ensure a better penetration in the fuel, an optimum mixture and good flame stability. It
might be necessary to have high air pressure upstream the disk in order to avoid flame pulsation and it's considered
practically indispensable when the burner is operating with a pressurised furnace and/or thermal load. It's evident from
the above, that the device which closes the air on the combustion head should be put in such a position as to always
obtain a decidedly high air pressure value behind the disk. It's advisable to regulate in such a way as to achieve a closing
of the air on the head; this will necessitate a considerable opening of the air shutter which regulates the flow to the
burner's fan suction. Obviously, these adjustments should be carried out when the burner is operating at maximum
delivery desired. In practice, start regulating by putting the device which closes the air on the combustion head in an
intermediate position, start up the burner and make trial adjustments as previously described.
When maximum delivery desired has been reached, proceed with correcting the position of the device which closes
the air on the combustion head; move it backwards or forwards in such a way as to obtain an air flow suitable to the
delivery, with the air regulation shutter in suction considerably open. When reducing the air passage on the
combustion head, avoid closing it completely.
N.B. Check that ignition occurs regularly, because if the passage between the disk and the head is closed, it could occur
that the air velocity is so high as to render ignition difficult. If this happens, gradually open the regulator until it reaches
the correct position and ignition occurs regularly. This position should be definitive.
MAINTENANCE
The burner does not require special maintenance, but it is good practice to check periodically that the gas filter is clean
and that the ignition electrode is efficient. It is also necessary to verify that the ignition electrode's spark is produced
between the same electrode and the disk. The combustion head may need cleaning. During re-assembly, special
attention must be paid to centring exactly the electrodes (ignition and flame detection) in order to avoid them going to
earth or short-circuiting which would result in the "shut down" of the burner.

USE OF THE BURNER

The burner operates fully automatically, therefore it is non necessary to carry out any kind at adjustment during its operating.
The "block" position is a safety position reached by the burner automatically when some of the components of the burners
or the plant do not work properly. It is necessary to check then whether the cause to the problem is a dangerous one before
unblocking the burner. The causes to the block may be temporary, for example when air in inside the pipes.
When it is unblocked, the burner starts operating properly.
If the burner stops three or four times at a stretch, it is necessary either to loock for the problem and solve it or ask for the
intervention of the after sales service. The burner can remain in the "block" position without any limit in time.
In emergency cases it is advisable to close the fuel valve, and to disconnect the burner electrically.
(see BT 8769/2 and 0002932171)
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and CO values
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