Light Oil Ignition And Adjustment - baltur COMIST 26 SP Manual De Instrucciones

DUAL FUEL BURNER'S FIRING INDICATIONS
We suggest to start the burner with the liquid fuel, as in this case the delivery is bound to the nozzle size whilst the gas
delivery can be easily changed by acting on the relative capacity adjuster.
If the burner is in the automatic version, the selector for the fuel change connects a cyclic relay which inserts, thanks to
an auxiliary relay, components for the use of both fuels (valves, pressure switches, pump etc.).
After having changed the position of the selector from gas to light oil and viceversa, it occurs to leave it stopped for at
least 10 seconds which is the time the cyclic relay needs to carry out its program.
Note : If the selector is moved from a position to another before the period of 10 seconds, the cyclic relay stops in the
middle of its program not allowing to use the burner both with gas and with light oil.
PREPARATIONS FOR IGNITION WITH LIGHT OIL
Control that the nozzle applied is suitable for the boiler potentiality.
The table shows delivery rates in kg/h of light oil with respect to the nozzle size and the pump pressure (normally 20 bar
for the 2nd flame). It should be remembered that 1 kg of light oil is equivalent to approximately 10.200 kcal.
When choosing the nozzle (45° spary angle) it should be kept in mind that fuel delivery at the 1st flame must not be
considerably lower than the minimum output of the burner (see the burner rating plate).
Check that the combustion head penetrates the combustion chamber to the extent specified by the boiler
manufacturer. Make sure that the ruturn pipe in the tank has no obstructions, e.g. gate valves closed, plugs etc.
Any eventual obstruction would cause a brekage in the sealing surface situated on the pump shaft or of the flexible
pipe. Eliminate the connection or "bridge" to the 2nd flame thermostat. Open, by loosening, the special fitting which the
pump has been provided with to purge air. When fuel is seen coming out of the air purge device, open the main switch
to stop the motor. The burner is now ready to be started up with light oil.

LIGHT OIL IGNITION AND ADJUSTMENT

1) Check that the pump and fan motors rotate in the right direction.
2) Make sure that the discarge of combustion products can take place freely (chimney lock-gates should be open)
and that there is water in the boiler.
3) Open, as much as considered necessary, the combustion air regulator (see drawing air regulation servomotor
cod. 0002932130) and open by about half the air passage between thehead and the disk by operating the regulating
screw of the flame disk.
4) Disconnect the 2 nd flame thermostat to avoid the ignition of this same flame, close the main switch in order to
connect the burner and wait for it to start up. With the burner operating at 1
combustion air delivery. The pump pressure for the "1
burner and then turn it on again in order to verify that ignition occurs correctly. It should be remembered that, in
order to ensure a soft ignition, it is necessary to regulate in such a way that the quantity of air is the minimum
indispensable. If ignition takes place softly, disconnect the burner from the main switch and make a direct connection
(bridge) between the 2
5) Regulate the combustion air in the position considered necessary for insertion of the 2
(see air regulation servomotor cod. 0002932130).
6) Now, connect again the burner which will start operating with the 1st and 2nd flames. Operate the air regulation
cam of the 2 nd flame in order to adapt its delivery to the specific conditions. The pump pressure for the "2
should be 20 bar.
7) The burner is fitted with a device which optimizes the combustion by reducing or increasing the air passage
between the disk and the head. Maximum smoke intensity permissable is n° 2 of the Bacharach scale, with a
Carbon Dioxide (CO
the disk and the head when operating with a reduced fuel delivery. This passage must be proportionately opened
more when the burner is working with a higher fuel delivery. When modifying this position, it is normally necessary
to correct the position of the air regulation shutters of the 1
occurs correctly.
nd
flame thermostat terminals.
) value of between 10 and 13%. It is normally necessary to reduce the air passage between
2
st flame" should be 10 bar. After regulation, turn off the
st nd
and 2 flames, and subsequently, verify that ignition
20
st
flame correct, if necessary, the
nd
flame
nd flame"