baltur BT 40 DSG Manual De Instrucciones página 50

AIR REGULATION ON THE
COMBUSTION HEAD
8608/1)
The combustion head is fitted
with a regulation device which
closes (move forward) the air flow
between the disk and the head.
Thus by closing the passage, a high
pressure is obtained upstream the
disk also with low flow rates. The
high velocity and turbulence of the
air ensures better penetration in the
fuel, hence an optimal mixture and
flame stability. It might be necessary
to have a high air pressure upstream
the disk to avoid flame pulsation;
this condition becomes practically
essential when the burner works
either with an over pressure furnace
or a high thermal load.
From the above it is evident that
the device which closes the air on
the combustion head should be set
in such a position so as to obtain
always high air pressure behind
the disk.
Close air passage on the burner
head so as to require a considerable
opening of the air shutter which
controls the suction flow of the burner
fan; obviously this condition should
exist when the burner is working at
maximum desired output. As a rule
adjustment should be started with
the device which closes the air flow
on the combustion head set in an
intermediate position, and starting
up the burner for a trial adjustment
as previously stated.
When the maximum desired burner
output is achieved, re-set the
device which closes flow air on the
combustion head either in a forward
or backward position so as to obtain
an air flow suitable for delivery
rate, with the suction air shutter
considerably open. When reducing
the air passage on the combustion
head, do not close it completely.
Line it accurately in respect to
the disk. Remember that if an
accurate alignment is not made in
respect to the disk a bad combustion
and excessive head heating will
result with consequent rapid
deterioration.
Check it through the window in the
back of the burner and then tighten
up the screws which block the air
control device in position on the
combustion head.
INCORRECT REGULATION
(see BT
Combustion air inlet with
very locked shutter
CORRECT REGULATION
Combustion air inlet with
very opened shutter
Remarks: Make sure that start-
up takes place normally,
because if the air control
device has moved forward, it
may happen that the air out-
flow velocity is so high that
starting up proves difficult. In
this case, move the air control
device gradually backward
until it reaches a position
where starting up takes place
normally; this position should
be final.
It is better to keep the amount of
air for the 1st flame to the bare
minimum if a fail-safe ignition is to
be achieved also under the most
critical conditions.
00060807_200709
Combustion head
Air flow large
opening
Combustion head
A i r f l o w q u i t e
locked.
ATTENTION: Avoid
complete locking.
SETTING THE DISTANCE
BETWEEN THE DISK AND
THE NOZZLE
Burners are fitted with a device
which permits to change the distance
between the disk and the nozzle.
The distance between the disk and
the nozzle is set in the factory, and
it should be reduced only if the
atomized fuel cone coming out of
the nozzle wets the disk and fouls
it up.
50 / 98
Control and fixing knobs of
combustion head
Control and fixing knobs of
combustion head