Description Of Operation - baltur BTG 3,6 P Manuel D'instructions

DESCRIPTION OF OPERATION

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 and it is
detected by its own control device, thus allowing the continuation
and completion of the ignition phase. In the case of flame failure,
the command and control equipment activates a "safety shut down"
within 3 seconds from the opening of the gas valves (operating
and safety). In case of 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.
IGNITION AND ADJUSTMENT
WITH METHANE GAS
In order to proceed with ignition, if the burner is three-phase, check
that the motor rotation direction is correct. It is indispensable to carry
out a purge of the air contained in the pipeline, if it had not been
carried out when connecting the burner to the gas pipeline. As a
precaution, special care should be taken and doors and windows
should be opened. Open the pipe fitting on the pipeline situated near
the burner and then open the gas shut-off valve(s) a little. When the
characteristic odour of gas can be smelled, close the shut-off valve.
Wait long enough for the gas in the room to disperse, depending
on local conditions, then connect the burner to the gas pipe again.
Then proceed as follows:
• Make sure that the discharge of combustion products can take
place freely (chimney gates should be open) and that there is
water in the boiler.
• Open as much as considered necessary, the combustion air
regulator, (see 8920/1 - 8943) and open by about one third the
air passage between the head and the flame disk (diffuser) see
"Combustion head regulation".
• Operate the regulators incorporated in the gas valves in such
a way as to obtain the gas delivery presumed necessary (see
0002910310).
• Disconnect the 2 flame thermostat and give current to the
nd
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 1 flame) will be inserted. The valves open
st
completely and gas delivery is limited to the position at which
the flow regulator incorporated in the 1
manually regulated. At first ignition, successive "shut downs"
could occur, due to the following reasons:
- The gas piping not being purged of the air sufficiently, so that
the gas flow is insufficient to ensure a stable flame.
- "Lock out" with flame presence could be caused by flame
instability in the ionisation area, due to an incorrect air/gas
ratio. This can be solved by changing the amount of air and/or
gas supplied, so as to find the right ratio. This problem could
- It may occur that the ionisation current is disturbed by the
• With the burner on, adapt flow rate to the required value, by
reading the meter. The flow rate can be modified using the
special regulator incorporated on the valve (see the following
pages for a description on how to regulate the valves).
• Check that combustion occurs correctly by using the appropriate
instruments (CO
0.1%).
• After this adjustment, switch the burner off and on again a few
times to check if ignition is correct. With the burner disconnected
from the main switch, connect the 2
regulate the special device on the servomotor in such a way as
to obtain an opening of the air shutter presumed necessary for
the 2
incorporated in the valve to allow for the correct delivery
presumed necessary for the 2
• Now close the main switch to start up the burner. When the
burner is lit, it is necessary to check as previously shown, the
gas flow and the combustion with the appropriate instruments.
Depending on the tests performed, vary the gas and relative
combustion air flow in order to adapt output to that required for
the specific case (boiler power). It is also necessary to check if
the CO
for natural gas and CO = 0.1%).
• Check the efficiency of the safety devices, block devices (by
unplugging the ionisation electrode cable), air pressure switch,
gas pressure switch and thermostats.
• It must be specified that if the contact is not closed during
working, the control box will carry out its cycle, but the ignition
transformer will not be inserted and the gas valves will not
flame valve has been
st
open. Consequently, the burner will go to shut down. Check
that the air pressure switch functions properly with burner
operating at 1
it reaches intervention point and the burner should go to shut
down. Release the burner by pushing the appropriate button
and readjust the pressure switch until preventilation air pressure
can be detected.
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also be caused by an incorrect distribution of air/gas in the
combustion head. This can be solved with the combustion
head adjustment device by further closing or opening the
air passage between the combustion head and gas diffuser.
discharge current of the ignition transformer (the two currents
have a common path on the burner's "mass") so the burner
locks out due to an insufficient ionisation. This can be solved
by inverting the input (230V side) of the ignition transformer
(the places of the two wires that give voltage to the transformer
are exchanged). This problem could also be caused by the
burner's casing not being properly "earthed". We must point
out that the minimum value of the ionisation current to ensure
the operation of the equipment is shown on the wiring diagram.
max.= about 10% for natural gas - CO max. =
2
flame (see 8920/1). Open as well the gas flow regulator
nd
flame (main flame).
nd
and CO values are adequate (CO
2
The pressure switch connection circuit foresees a self-check,
so the contact that should be closed in stand-by (the valve
is stopped so no air pressure in the burner) must actually
create this condition. Otherwise the command and control
equipment will not be activated (the burner will not start up).
flame only, increase the regulating value until
st
flame thermostat and
nd
max. = about 10%
2