Natural Gas Starting Up And Regulation - baltur BTG 15 Manual De Instrucciones

NATURAL GAS STARTING UP AND REGULATION

In order to proceed with starting up, it's necessary, if the burner is three-phase, to check that the sense of rotation
of the motor is correct. If not already done so at the moment of connecting the burner to the gas pipeline, it's
indispensable to carry a purge of the air contained in the pipeline. As a precaution, special care should be taken
and doors and windows should be opened. Open the pipe union on the pipeline situated near the burner and
then open a little the cut-off cock (or cocks).When the characteristic odour of gas can be smelled, close the cut-
off cock. Wait until the gas present in the room has dispersed, and then reconnect the burner to the gas pipeline.
Then proceed as follows:
1) Make sure that the discharge of combustion products can take place freely (chimney lock-gates should be
open) and that there is water in the boiler.
2) Set the adjustment damper to the position that is presume to be required. To do this, slacken fastening
screw "C" (see 0002934112) and set index "B" in the desired position using screw "A".
3) Operate the regulators incorporated in the gas valves in such a way as to obtain the gas delivery presumed
necessary.
4) Give current to the burner by opening the main switch. The burners is then turned on and carries out the pre-
ventilation phase. If the air pressure exceeds that value at which the air pressure switch has been set, the
ignition transformer will be connected and, subsequently, the gas valves (safety and operating) will be inserted.
The valves open completely is limited to the position at which the fl ow regulator incorporated in the operating
valve has been manually regulated. At fi rst ignition, successive "shut downs" could occur, due to the following
reasons:
a- The gas pipeline has not been adequately purged of air and therefore the quantity of gas is not suffi cient
to allow for a stable fl ame.
b- A "shut down" with fl ame presence could be caused by fl ame instability in the ionisation zone, due to and
incorrect air/gas ratio. This can be remedied by varying the quantity of air and/or gas delivered, in order to
fi nd the correct ratio. It could also be caused by an incorrect distribution of air/gas in the combustion head.
This can be corrected by operating the regulation device of the combustion head by closing or opening
more the air passage between the head and the gas diffuser. See chapter "Regulation of the combustion
head".
c- It could happen that the ionisation current is help up by the current discharged from the ignition transfor-
mer (the two currents have to run the same course on the burner's "earth") and so the burner goes to
"shut down" due to insuffi cient ionisation. This can be remedied by inverting the input (230V side) of the
ignition transformer (change the places of the two wire that take voltage to the transformer). A shut down
with fl ame presence could also be caused by the burner's casing not being properly "grounded". We
must point out that the minimum value of the ionisation current to ensure the working of the control box is
shown in the electrical diagram; normally the ionisation current is decidedly higher. To check the ionisation
current, connect a microammeter with an adequate scale "in series" to the ionisation circuit. The cable
of the ionisation electrode is equipped with a connector (see circuit diagram) to facilitate the micro-am-
meter connection. The high isolation wire that comes from the electrode must be inserted to the negative
(sign -) of the microammeter.
5) With the burner on, adapt delivery to that desired (methane gas = 8550 kcal/m
readings, the second one exactly one minute after the fi rst one. The difference between the two readings schould
be multiplied by in order to obtain the fl ow per hour (60 minutes). This output can be modifi ed by operating the
special regulator incorporated in the valve (see the last pages for a desciption of how to regulate the valves).
6) Control that combustion occurs correctly by using the appropriate instruments (CO
gas - CO max. = 0.1%).
7) After regulation, turn the burner off and on again several times to check that ignition occurs correctly.
8) When the has started up it is necessary to check as previously shown, the gas delivery and the combustion with
the appropriate instruments. When the results are known, necessary, proceed with varying the gas delivery
and relative combustion air in order to adapt delivery to that required for the specifi c case (boiler potentiality).
It's also necessary to check if the CO
and CO = 0.1%).
9) Control the effi ciency of the safety devices: the "shut down" (by detaching the ionisation electrode cable), the
ONE STAGE NATURAL GAS BURNERS
and CO values are adequate (CO
2
35 / 87
0006080876 ed 2007/02
(for LPG operation see the relative chapter)
) by reading the meter. Take two
3
= about 10% for methane
2
max. = about 10% for methane gas
2