Starting Up And Regulation With Methane Gas - baltur TBG 35 PN Manual De Instrucciones

STARTING UP AND REGULATION
WITH METHANE GAS
1) Check that combustion head penetrates the
combustion chamber by the amount requested
by the manufacturer of the boiler. Check that the
air adjustment device that closes the air on the
combustion head is in correct position for the fuel
supply required (the air passage between the
diffuser disk and the head must be slightly reduced
for low combustion supply and relatively open
when combustion supply is higher). See chapter
"Combustion head adjustment".
2) 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 union on the pipeline situated near the burner
and then open a little the gas cut-off cock (or cocks).
When the characteristic odour of gas can be smelled,
close the cut-off cock. Wait long enough for the gas in
the room to disperse, depending on local conditions,
then connect the burner to the gas pipe again.
3) Check that there is water in the boiler and that the
system's gate valves are open.
4) Make absolutely sure that the products of combustion
can be released freely (boiler and flue dampers must
be open).
5) Make sure that the voltage of the electric line to
which the burner is to be connected, corresponds
to that required by the burner and that the electrical
connections (motor or principle line) have been
prepared to match the voltage rating available.
Check that all electrical connections made on-site are
performed correctly as shown in our wiring diagram.
6) Apply a pressure gauge of appropriate scale to the
pressure intake of gas to indicate the adjustment
value (if the amount of pressure to be used permits,
it is preferable to use a water column instrument;
do not use instruments with indicator hands for low
pressures). Rotate the manual head gas pressure
adjustment device to the position which is best
with respect to the modulation maximum thermal
output and the furnace characteristics, following the
instructions laid out in the section "Manual head gas
pressure adjustment device".
7) Put the adjustment cam on the air adjustment
electric servomotor (see adjustment instructions
0002933651) in the positions which are presumed to
be appropriate in proportion to the minimum thermal
output, the modulation maximum and the ignition
thermal output.
8) Set the desired ratio between gas and air pressure,
following the adjustment instructions of the pneumatic
valve in the attached manual for the gas train installed
9) For initial adjustment operate the burner manually
using the appropriate modulation connector supplied
as standard (see section "instructions for manual
operation of burner"). Now switch on the main switch.
Preventilation is carried out with air open and therefore, at
!
the same time, the regulation servomotor is switched on and
completes the full opening stroke cycle up to the "maximum"
setting. Only when the adjustment servomotor has returned
to the "ignition" position will the control equipment proceed
with its program switching on the transformer and the ignition
gas valve.
During preventilation, make sure that the air pressure
switch changes its status (from the closed position
without pressure measurement to the closed position
with pressure measurement).
If the pressure switch does not detect sufficient
pressure (and does not change status), neither
the transformer nor the pilot flame gas valve are
activated and the equipment locks out. However, an
occasional lock-out during the first stage of ignition is
normal, as air is still present in the valve train pipeline.
The air must be vented to obtain a stable flame. To
release, press the "reset" button (13) (see diagram
0002936140).
When first switching on, repeated "lock outs" may occur
due to:
a) The gas piping not being freed of the air sufficiently
and so the gas quantity is not enough to provide a
stable flame.
b) "lock out" with flame present may be caused by
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 also be caused by a wrong air/
gas distribution in the combustion head. This can
be remedied with the combustion head adjustment
device by closing or opening the air passage further
between combustion head and gas diffuser.
10) Put the burner to minimum thermal output
modulation position (air damper control servomotor
at minimum) putting the modulation connector (see
section "instructions for manual operation of burner")
to the MIN position, checking the size and appearance
of the flame, correcting if necessary. To this end
follow the relative instructions of the pneumatic
valve installed. Afterwards a check is carried out on
the quantity of gas supplied, by reading the meter.
If necessary the gas supply and the corresponding
combustion air can be corrected as previously
described (points 7 and 8). Subsequently check
combustion with the special instruments. To obtain
a correct air-to-gas ratio, you must find a carbon
dioxide (C0 ) value for the methane that is at least
2
8 % or O =6% at minimum burner supply up to an
2
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