baltur BGN 200 DSPGN-ME Mode D'emploi page 39

down". This control should also
be carried out when the burner is
already operating. By detaching
the wire that comes from the
ionisation electrode, the control
box should go immediately to
"shut down". In the case of the
UV photoelectric cell, slide the
wire out of its seat on the burner
and verify the "shut down".
15) Check the efficiency of the
boiler thermostats and pressure
switches (this should result in
the burner coming to a stand-
still).
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 (combusti-
ble air) is so high that ignition is
made diffi cult. 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 posi-
tion must be accepted as the
act position. Remember that, for
the ignition fl ame, it is preferable
to limit the quantity of air to the
bare minimum necessary for a
safe ignition, even in the most
demanding cases.
16) Ins tr uc tions for m a nua l
mode working of the burner
Combustion control can be
carried out over the whole mo-
dulation range while manually
controlling the MPA 22 equip-
ment. For this use modulation
connector (B) in the diagram,
which is provided with the burner
as standard. After disconnecting
the 4-pole plug (A) which takes
the signals from the thermostat
or the RWF 40 adjustor, insert
the connector in position (B).
Use the +/- buttons to increase
or reduce the gas and air supply.
After this control, put the 4-pole
plug (A) back in so as to reset
automatic mode modulation.
ADJUSTEMENT OF THE
AIR FLOW TO THE BURNER
HEAD (see BT 8769/1)
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 fl ame stability.
It may be essential to have high air
pressure at the disk, to stop fl ame
pulsation.
This condition is practically indispen-
sable 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 always obtains a level behind the
disk that is much higher than the air
pressure level.
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It is recommended to set the device
with the air to the head closed off,
so that a sizable opening is requi-
red on the air shutter that controls
the fl ow 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, desired delivery rate
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 fl ow in delivery, with the intake
air control shutter well open. When air control shutter well open
reducing the size of the air passage
to the burner head, avoid closing it
completely. Ensure that the burner
head is perfectly centered in rela-
tion to the disk. If it is not perfectly If it is not perfectly
centered, the fl ame may burn badly centered, the fl ame may burn badly
and overheat the head, causing and overheat the head, causing
rapid deterioration. The centering rapid deterioration
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 fl ow 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 diffi cult. 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 po-
sition must be accepted as the set
position. Remember that, for the
fi rst fl ame, it is preferable to limit the
quantity of air to the bare minimum
necessary for a safe ignition, even
in the most demanding cases.