Air Regulation On The Combustion Head - baltur BTG 6 Manual De Instrucciones

10) Control the efficiency of the safety devices: the "shut
down" (by detaching the ionisation electrode cable), the
air pressure switch, the gas pressure switch, the gas pressure
switch and the thermostats).
!
The pressure switch is self-controlled and trefore it must
close the contact, which is foreseen to be closed at rest, (fan
stops and consequently there is an absence of air pressure in
the burner); if it does not, the control box will not be inserted (the
burner remains at as standstill). It must be specified that if the
contact is not closed during working, the control box will carry
out its cycle, but the ignition transformer will not be inserted and
the gas valves will not open. Consequently, the burner will go
to shut down. Check that the air pressure switch functions
properly with burner operating at 1
regulating value until it reaches intervention point and the bur-
ner should go to shut down. To ublock the burner, press the
E
special pushbutton and return the pressure switch regulator to
a sufficient value in order to measure the air pressure existing
N
during the pre-ventilation phase.
G

AIR REGULATION ON THE COMBUSTION HEAD

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8922/2-000293472)
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The combustion head is equipped with a regulating device which
I
closes and opens the air passage between the disk and the head. By
closing the passage it's possible to achieve high pressure upstream
S
the disk for low inputs as well. High velocity and turbulence ensure
a better penetration in the fuel, an optimum mixture and good flame
H
stability. It might be necessary to have high air pressure upstream
AIR REGULATION AND ELECTRODES-DISK POSITIONING PRINCIPLE DIAGRAM BTG 3,6 - 6
1 regulating screw disk-head (screw in order to open the air
passage between the disk end the head unscrew to close)
2 Disk: attantion: avoid closing it completely
3 Combustion head
4 Reference position disk-head
the disk in order to avoid flame pulsation and it's considered practi-
cally indispensable when the burner is operating with a pressurised
furnace and/or thermal load. It's evident from the above, that the
device which closes the air on the combustion head should be put
in such a position as to always obtain a decidedly high air pressure
value behind the disk. It's advisable to regulate in such a way as
to achieve a closing of the air on the head; this will necessitate a
considerable opening of the air shutter which regulates the flow to
the burner's fan suction. Obviously, these adjustments should be
carried out when the burner is operating at maximum delivery desi-
red. In practice, start regulating by putting the device which closes
the air on the combustion head in an intermediate position, start
up the burner and make trial adjustments as previously described.
When maximum delivery desired has been reached, proceed with
correcting the position of the device which closes the air on the
flame only, increase the
st
combustion head; move it backwards or forwards in such a way as
to obtain an air flow suitable to the delivery, with the air regulation
shutter in suction considerably open.
When reducing the air passage on the combustion head, avoid
closing it completely.
1 Max ignition electrode projection
56 Ionizing electrode projection
5
6
7
8
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Check that ignition occurs regularly, because if the passage
!
between the disk and the head is closed, it could occur that
the air velocity is so high as to render ignition difficult. If this
happens, gradually open the regulator until it reaches the
correct position and ignition occurs regularly. This position
should be definitive. It should alsobe remembered that, for
the 1 flame, it is preferable to limit the quantity of air to that
st
which is strictly indispensable in order to have safe ignition
even in the most difficult circumstances.
Air regulation manual system
Air regulation servomotor only for BTG 3.6P - 6P
Ionizing electrode
Ignition electrode