Description Of Operations; Natural Gas Starting Up And Regulation - baltur BTG 3 Notice D'instructions

DESCRIPTION OF OPERATIONS

By closing the main switch, and if the thermostats are closed, voltage
will reach the control box and, after a short time, the burner will start
up according to its pre-established programme. The fan motor will
then be turned on and, when it starts functioning, it will bring about
a pre -washing of the combustion chamber. Subsequently, ignition
is connected and, after three seconds, the safety valve and the
operating (main) valve will open. The flame appears in this way
and, detected by it's own control device, it permit the continuation
and completion of the ignition phase. In the case of flame failure,
the control box activates a "safety shut down" within two seconds
of the opening of the gas valves (operating and safety). When there
is a "safety shut down" the gas valves are immediately re-closed.
To unblock the control box from the safety position, push the red
button on the control panel.
NATURAL GAS STARTING
UP AND REGULATION
• 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.
• Check the voltage on the mains to which the unit is to
be connected: make sure that it corresponds with burner
requirements and that all electrical connections made at the
installation site are effected properly as illustrated in our wiring
diagram.
• Open as much as considered necessary, the combustion air
regulator, and open by about one hird the air passage between
the head and the disk by operating the regulating screw of the
flame disk (diffuser). (See regulation of the combustion head
0002933270).
• Operate the regulators incorporated in the gas valves in such
a way as to obtain the gas delivery presumed necessary. (see
0002910300 and 0002910220).
• 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 flow regulator incorporated
in the operating valve has been manually regulated. At first
ignition, successive "shut downs" could occur, due to the
following reasons:
- The gas pipeline has not been adequately purged of air and
therefore the quantity of gas is not sufficient to allow for a
stable flame.
- A "shut down" with flame presence could be caused by flame
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 find 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
A) Adjustable screw for air damper opening
B) Reference index for air damper opening
C) Completely open damper: reference index in posiion "6"
D) Closed damper: reference index in position "0"
opening more the air passage between the head and the
gas diffuser.
- It could happen that the ionisation current is help up by the
current discharged from the ignition transformer (the two
currents have to run the same course on the burner's "earth")
and so the burner goes to "shut down" due to insufficient
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
flame 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.
• With the burner on, adapt delivery to that desired, by reading
the meter. This output can be modified by operating the special
regulator incorporated in the valve (see the following pages for
a desciption of how to regulate the valves).
• Control that combustion occurs correctly by using the appropriate
instruments (CO
0.1%).
• After regulation, turn the burner off and on again several times
to check that ignition occurs correctly.
• 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 specific case
(boiler potentiality). It's also necessary to check if the CO
CO values are adequate (CO
gas and CO = 0.1%).
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0006080742_201306
= about 10% for methane gas -CO max. =
2
max. = about 10% for methane
2
and
2