baltur TBG 35 PN Notice D'instructions page 13

STARTING UP AND REGULATION WITH METH-
ANE GAS
1) Check that combustion head penetrates the combustion cham-
ber 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 modula-
tion 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 posi-
tion (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 sup-
plied, 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
that is at least 8 % or O
to an optimal value of 10 % or 0
It is essential to check, with a suitable instrument, that the per-
centage of carbon monoxide (CO) present in the fumes does
not exceed the limit set by regulations at the time of installation.
11) After setting the burner to the minimum thermal output, put the mod-
ulation connector switch to the MAX position. The air adjustment
servomotor is put at "maximum" and consequently also the gas
supply reaches the maximum thermal output. Afterwards a check
is carried out on the quantity of gas supplied, by reading the meter.
With the burner on at the maximum supply available,
the gas output is found by calculating the difference be-
tween two readings exactly one minute apart. The differ-
ence between the two readings should be multiplied by
sixty in order to obtain the flow per hour (60 minutes).
Multiplying the flow per hour (m
of the gas, the power supplied in kcal/h is obtained which
must corrispond or be very close to that required by the
boiler (lower calorific power for methane = 8550 kcal/h).
11 / 20
0006081437_201005
) value for the methane
2
=6% at minimum burner supply up
2
= 3% for maximum supply.
2
3
/h) by the calorific power
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