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• Open the manual gas flow rate regulator for the second flame
(main flame) to the necessary extent.
• Now switch the burner on again, turning off the main and control
panel switch. The burner switches on and automatically switches on
the second flame (main flame). Verify the combustion parameters
using the appropriate means and, if necessary, correct the gas and
air output, as indicated in points 4 and 5.
• Use the adjuster to set the correct flow for the second flame as
required for the specific case. You must not keep the burner running
if the flow rate 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 output 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 prevents the opening of the gas valves if
the air pressure is not the foreseen one. The pressure switch must
therefore be adjusted to intervene closing the 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”. To ensure correct working of the air pressure switch,
you must, with burner on and with first flame only, increase
the regulation until it is triggered and immediately locks-out the
burner. 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 pre-ventilation stage.
• The gas control pressure switch (minimum) prevents burner
operation when gas pressure is not the foreseen one. 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. Upon
first switching on the burner it is essential to check for the correct
operation of the pressure switch.
• Check for the triggering of the flame detector (ionisation electrode).
Disconnect the jumper between terminals 30 and 31 on the printed
circuit board and switch on the burner. The equipment must run
through its cycle completely and, three seconds after the ignition
flame has formed, it must “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 “lock-out”.
• Check the efficiency of the thermostats or boiler pressure switches
(they should shut down the burner when triggered).
CAUTION / WARNING
Check that the ignition takes place properly. In the event that
the mixer is too far forward, it may happen that the outgoing
air speed is so high that ignition is difficult. If this happens, the
mixer must be gradually shifted back until it is in a position in
which ignition occurs normally, and this new position can be
regarded as the final position.
Remember that with a small
flame, it is better to limit the amount of air to the amount
strictly indispensable to ensure safe ignition even in the
most difficult cases.
Summary of Contents for TBG 45 P
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