Maintenance - Use Of The Burner - Air Regulation On The Combustion Head - baltur BGN 34 P Instruction

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.
AIR REGULATION ON THE COMBUSTION HEAD (See BT 8769/1)
The burner head is fitted with a regulator control, which closes or opens the air passage between the disk and the head.
By closing the air passage, a high pressure on the disk can be achieved, for low flow rates as well. The increased
speed and turbulence of the air makes it penetrate with increased force, thus giving a better mixture and greater flame
stability.
It may be essential to have high air pressure at the disk, to stop flame pulsation.
This condition is practically indispensable when the burner is working on a pressurized boiler and/or a high thermic
load. It is clear from the above description that the device that closes the air to the burner head must be taken to a
position where it always obtains a level behind the disk that is much higher than the air pressure level. It is recom-
mended to set the device with the air to the head closed off, so that a sizable opening is required on the air shutter that
controls the flow to the burner fan intake. Obviously, this condition must occur when the burner is working at the
maximum desired delivery rate.
In practice, the setting operation should be started with the device that closes the air to the burner head at an interme-
diate position, and the burner should be started up for a trial setting procedure, as described previously.
maximum desired delivery rate is reached, adjust the position of the device that closes the air to the burner head,
moving it forwards or backwards in order to achieve an adequate air flow in delivery, with the intake air control shutter
well open.
When reducing the size of the air passage to the burner head, avoid closing it completely.
Ensure that the burner head is perfectly centred in relation to the disk.
If it is not perfectly centred, the flame may burn badly and over heat the head, causing rapid deterioration.
The centring can be checked by looking from the inspection hole on the rear part of the burner and then fully tightening
the screws (if present) that hold in position the device that controls the air flow to the burner head.
N.B. Check that the ignition occurs in a regular manner; if the passage between the head and the disk is
closed, it may occur that the speed of the mixture (combustible air) is so high that ignition is made difficult. If
this occurs, then the regulator must be opened gradually until it is in a position where the ignition occurs in a
regular manner, and this position must be accepted as the set position.
Remember that, for the first flame, it is preferable to limit the quantity of air to the bare minimum necessary for
a safe ignition, even in the most demanding cases.
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When the