Baltur BT 350 DSG Manual User Instructions - Disk And Nozzle
12 / 22
98318_201204
min. 10% to max. 13% with a smoke number not exceeding
2 (Bacharach scale). We remind you that for the first flame
is preferable to limit the quantity of air to the lowest amount
possible needed for safe ignition, even in the most difficult
circumstances.
ADJUSTING THE DISTANCE BETWEEN
DISK AND NOZZLE
The burners are equipped with a device that allows the distance
between disk and nozzle to be varied. The factory set distance
between disk and nozzle should be reduced only if you notice that
the cone of atomised fuel coming out of the nozzle wets the disk
fouling it.
ADJUSTING THE AIR ON THE COMBUSTION
HEAD
The combustion head has a control device that allows the air
passage between the disk and the combustion head to be opened
(move backward) or closed (move forward).
By closing the passage, it is thus possible to obtain a high pressure
upstream of the disk also for low flow rates. The high speed and
turbulence of the air provides for its greater penetration into the
fuel and therefore an excellent mixture and flame stability. High air
pressure upstream of the disk may be necessary to prevent flame
fluctuations, this is particularly essential when the burner works on
the furnace that is pressurised and/or at a high thermal load.
It is clear from the above that the device that closes the air to the
combustion head must be set at a position such as to always obtain
very high air pressure behind the disk. It is advisable to adjust it in
such a way as to obtain a closure of the air at the combustion head
that will require a significant opening of the air shutter that regulates
the suction flow from the burner fan. This must of course be the
case when the burner is working at the required maximum supply.
In practice you have to start the adjustment with the device that
closes the air at the combustion head in an intermediate position,
switching on the burner for an approximate adjustment as explained
previously.
When the maximum required supply is reached, correct the position
of the device closing the air on the combustion head by moving
it forwards or backwards so as to have a suitable air flow for the
delivery, with suction air adjustment shutter sensibly open.
When reducing the air passage on the combustion head, avoid
closing it completely. Perfectly centre with respect to the disk.
Remember that imperfect centring of the combustion head with
respect to the disk may result in bad combustion and overheating
of the head with its subsequent rapid deterioration. Check centring
by looking through the inspection hole placed on the back part of the
burner, then, tighten firmly the two screws fastening the air control
device on the combustion head.
Note:
Check that ignition is correct because if the regulator
is shifted forward, the outgoing air speed may be too high to
permit ignition. In such a case, it is necessary to move the
regulator backwards, degree by degree, until reaching the
position in which the ignition is regular and accept this new
position as definitive. We remind you that for the first flame is
preferable to limit the quantity of air to the strictly lowest amount
possible needed for safe ignition, even in the most difficult
circumstances.
CHECKS
After starting up the burner, check the safety devices (photocell,
block, thermostats).
1) The photocell is the flame control device and so it should trip if
the flame extinguishes during operation (this check should be
made after at least 1 minute from lighting up).
2) The burner should be capable of blocking itself and remain
so when a normal flame does not come on during the ignition
sequence and within the pre-set time on control device. The
lock-out causes the immediate stop of the motor and burner and
the switching on of the corresponding lock-out light indication.
To check the operation of the photocell and lock-out system,
proceed as follows:
a) Start the burner.
b) After at least one minute, remove the photocell from its seat
and pull it out and simulate flame failure by covering the
photocell (use a rag to close the window in the photocell
support). The burner flame should go out.
c) Keep the photocell in the dark and the burner will start again,
but the photocell does not see the light and the burner goes
into lock-out within the time pre-set by equipment program.
The equipment can be reset only manually by pressing the
appropriate push-button. The lock-out efficiency has to be
tested at least two times.
3) To check thermostat efficiency, make the burner work
until the water inside the boiler reaches a temperature
of at least 50°C. Then, use the thermostat control
knob to reduce the temperature until you perceive an
opening click and the burner stopping at the same time.
The thermostat tripping should occur with a deviation of 5 ÷ 10
°C with respect to the control thermometer (boiler thermometer).
Alternatively, change the setting of the thermostat scale making
it correspond to that of the thermometer.
USING THE BURNER
The burner operates fully automatically: it is activated by switching
on the main switch and the control panel switch. Burner operation
is controlled by command and control devices, as described in the
chapter “Operation description”. The “lock-out” position is a safety
position automatically taken up by the burner when a particular part
of the burner or of the system is inefficient. Therefore, it is good
practice, before "resetting" the burner and starting it up again, to
check that there are no defects in the heating plant. The length of
time that the burner stays in the “lock-out” position is without limit.
To unlock, push the appropriate button. Lock-outs can be caused
by transitory irregularities (a little water inside the fuel, air inside the
piping, etc.); in these cases, if the burner is locked it starts up as
usual. When, however, lock-outs occur repeatedly (3 or 4 times),
do not persist in trying to unlock the burner and after checking that
there is fuel in the tank, ask for the assistance of your local Technical