Combustion Head Setting - baltur BT 75 DSNM/D Manual De Instrucciones

See the viscosity-temperature graph relating to the type of oil
used, as a rough guide.

COMBUSTION HEAD SETTING

The burner is equipped with an adjustable (forwards and back-
wards) combustion head to ensure an opening and closure of the
air passage between head and disk. This way, high pressure at the
pre-disk position can be obtained even at low flow. Consequently,
high pressure and air turbulence enable better air penetration into
the fuel giving an optimum mixture and flame stability.
High air pressure in the pre-disk position might be indispensable
to avoid flame pulsation. This state is essential when the burner is
operating with a pressurized furnace and/or at high thermal output.
From what has been said above, it is clear that the combustion head
must be brought into a position giving decidedly high air pressure
behind the disk.
We recommend you to set enough air throttling between disk and
head, in order to open up well the air gate that regulates air flow
to the burner fan aspiration. These conditions must obviously
exist when the burner is operating at maximum output required.
In practice, setting should begin with the combustion head in an
intermediate position.
The burner is ignited and pre-setting should be carried out, as
already explained.
When maximum desired pressure has been achieved, the combu-
stion head position should be corrected, by shifting it either back-
wards or forwards in order to get sufficient air flow in relation to the
fuel supplied, with the air aspiration regulation gate fairly wide open.
If the combustion head is pushed forward (reduction of the passage
between head and disk) full closure must be avoided. When setting
the combustion head make sure you centre it perfectly in relation to
the disk. If the combustion head is not perfectly centred in relation
to the disk, poor combustion and excessive heating of the head
could occur and the latter would, as a result, deteriorate quickly.
You check as follows: with the flame lit, look through the window
on the rear of the burner.
You then fully tighten the two screws that lock the combustion head
into position.
SETTING THE DISTANCE BETWEEN DISK AND
NOZZLE
Burners are equipped with a device that allows the distance
between disk and nozzle to be varied. To change this distance,
turn the three disk fixing screws. By screwing (turning clock-wise)
you reduce the distance between disk and nozzle, by unscrewing
(turning anti-clockwise) you increase the distance between disk and
nozzle. Check that the disk is in a perpendicular position in relation
to air flow, by measuring the distance between the outer edge of
the combustion head and the disk. This position is achieved when
this distance is identical at each of the three disk fixing-regulating
screw positions. The distance between disk and nozzle, set in the
factory, should be reduced only if it is found that the atomized fuel
come exiting from the nozzle wets and dirties the disk.
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