baltur BGN 40 DSPGN-ME Manual De Instrucciones página 31

ADJUSTEMENT OF THE AIR FLOW TO THE BURNER HEAD (see BT 8769/2)
The burner head is fitted with a regulator control, which closes or open 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 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 recommended 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 desidered delivery rate. In practice, the setting operation shuld be started with the device
that closed the air to the burner head at an intermediate position, and the burner should be started up for a trial
setting procedure, as described previously. When the 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 centered in
relation to the disk. If it is not perfectly centered, the flame may burn badly and overheat the head, causing rapid
deterioration. The centering 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.
AIR REGULATION PRINCIPLE DIAGRAM FOR GAS BURNERS
31