baltur TBG 85 P Manuel D'instructions page 42

• Use the adjuster to set the correct flow for the second flame as
needed. You must not keep the burner running if the capacity
is greater than the maximum amount permitted for the boiler,
or there is a risk it could be damaged. It is therefore best to
stop the burner immediately after the two meter readings.
• Subsequently, with the burner at maximum supply required by
the boiler, check the combustion with the special instruments
and if necessary change the adjustment previously carried out
(air and possibly gas) with just the visual check (CO2 max. =
10 % O2 min =3% - CO max. = 0.1%)
• The air pressure switch is there to prevent the opening of the gas
valves if the air pressure is not at the required level. The pressure
switch must therefore be adjusted to intervene in closing contact
when the air pressure in the burner reaches a sufficient value.
If the air pressure switch does not detect pressure greater
than that calibrated, the equipment runs through its cycle
but does not switch on the ignition transformer and does
not open the gas valves and so the burner "locks-out".
Check that the air pressure switch functions properly with burner
operating at 1st flame only, increase the regulating value until
it reaches intervention point and the burner should go to shut
down. To release the burner, press the release button and adjust
the pressure switch to a sufficient level to detect the existing air
pressure during the preventilation stage.
• The control pressure switches for the gas (minimum) are to
prevent the working of the burner when the pressure of the gas
is not as provided for. It is clear from the specific function of the
pressure switches that the control pressure switch for minimum
pressure must make use of the contact that is closed when the
pressure switch detects pressure greater than that for which it is
regulated. The adjustment of the minimum gas pressure switch
must therefore be carried out when the burner is started up,
in accordance with the pressure that is found at the time. The
triggering (i.e. the opening of the circuit) of any of the pressure
switches when the burner is running (flame on) causes the
burner to stop immediately. When first switching on the burner it
is essential to check the correct working of the pressure switch.
• Check the triggering of the flame detector (ionisation electrode)
by disconnecting the jumper between terminals 30 and 31 on the
printed circuit board and switching on the burner. The equipment
must run through its cycle completely and, three seconds after
the ignition flame has formed, "lock-out". This check must also
be carried out when the burner is already on. Disconnecting the
30 and 31 jumper, the equipment must immediately go into its
"lock-out" action.
• Check that the boiler thermostats or pressure switches are
operating correctly (they must cause the boiler to shut down
when they intervene).
Check that ignition is correct because if the mixer is shifted
forward, the outgoing air speed may be too high to permit
ignition. Move backwards, degree by degree, the mixer until
reaching the position in which the ignition is regular and fix the
new position as definitive. We remind you that is preferable,
in the case of the small flame, to limit the quantity of air to
the lowest amount possible needed for safe ignition, even
in the most difficult circumstances.
IONISATION CURRENT MEASUREMENT
To measure the ionisation current, remove the jumper between
terminals 30-31 on the printed circuit with the burner off (see
diagram). Connect to the terminals a microammeter having a
suitable scale to have the burner restart. Once the flame has
appeared it will be possible to measure the ionisation current, the
minimum value of which ensuring the operation of the equipment
is shown in the specific wiring diagram. At the end of the
measurement, connect the jumper that has been disconnected.
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