Air Regulation On The Combustion Head - baltur COMIST 122 DSPGM Manual De Instrucciones

to check that the pressure switches are working properly. With
appropriate adjustment of the regulation components, we can
be sure that the pressure switch will be tripped (opening the
circuit) and shut down the burner.
19) To check the UV photocell and shutdown, proceed as follows:
a) start the burner.
b) After at least one minute from ignition remove the UV photocell
from its seat and simulate a flame failure by covering it with
a dark cloth. The burner flame must turn off, the equipment
must repeat the ignition phase from the beginning and shut
down as soon as the flame turns on.
c) The equipment can only be released manually by pressing the
release button. The burner shutdown efficiency test must be
performed at least twice.
20) Check the efficiency of the boiler pressure switches or
thermostats (they should shut down the burner when triggered).
AIR REGULATION ON THE COMBUSTION
HEAD
The combustion head is provided with an adjustment device that
closes (forward movement) or open (backward movement) the air
passage between disc and head. The passage closure increases
the pressure upstream of the disc also for low flow rates.
The high speed and turbulence of the air makes it penetrate the fuel
better, and therefore obtain an optimal mixture and flame stability. It
may be necessary to have high air pressure upstream of the disc to
prevent flame pulsations. This condition is indispensable when the
burner works with a pressurised furnace and/or has a high heat load.
From what explained above, it is evident that the device closing the
air on the combustion head must be moved in a position that makes
it possible to always obtain a clearly high air pressure behind the
disc. It is recommended to provide an air closure on the head, such
to require a considerable opening of the air gate that adjusts the
burner fan intake flow. Obviously this condition must occur when the
burner operates at the maximum required output. In practice, start
by adjusting the device that closes the air on the combustion head
at an intermediate position, turning on the burner for a preliminary
adjustment as described above.
When the maximum desired flow is reached, correct the position of
the device which closes air on the combustion head by moving it
forward or back so that the air flow is appropriate for the supply, with
the air adjustment gate valve noticeably open. When reducing the
air passage on the combustion head, make sure not to completely
close it. Perfectly center the combustion head with respect to the
disc. A combustion head not perfectly centered to the disc could
lead to a wrong combustion and overheat the same head causing
its early wearing.
Check it by looking through the inspection hole on the burner rear
side, and then fully tighten the screws that lock the air adjustment
device on the combustion head.
Check that ignition is correct because if the regulator
!
is shifted forward, the outgoing air speed may be too
high to permit ignition. If this happens, gradually move
the regulator back to a position in which ignition takes
place correctly, and accept this as the final position.
Remember that for the 1st flame, it is better to limit the
amount of air to the amount strictly necessary to ensure
safe ignition even in the most difficult cases.
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