baltur BTG 3,6P Instruction Manual page 46

ENGLISH
• With the burner turned off from the main switch, connect the second
flame thermostat directly.
• Open also the gas flow rate regulator integrated in the second valve
so as the necessary output for the main flame is enabled.
• Now turn the main switch on to ignite the burner.
• When the burner ignites with the second flame, it is necessary to
check as previously shown, the gas flow and the combustion with
the appropriate instruments.
• On the basis of checks carried out, change if necessary gas delivery
and respective combustion air to adjust delivery to the desired value
according to the specific case (boiler capacity).
• Check the combustion parameters with appropriate instruments
(CO2 MAX=10% O2 MIN= 3% CO MAX=0.1%)
• Control the efficiency of the safety and "shut down" devices (by
disconnecting the ionisation electrode cable), air pressure switch,
gas pressure switch and thermostats.
IMPORTANT
The pressure switch connection circuit is self-controlling.
Therefore, the contact which is meant to be closed in a non-
operating state (fan stopped and thus no air pressure in burner),
should in fact be in this state, otherwise the command/control
equipment will not be switched on (burner remains inoperative).
• If the contact foreseen to close when the unit is operating does not
close, the unit performs its cycle but the ignition transformer does
not start and the gas valves do not open, hence the burner remains
locked 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 unblock the burner, press the special pushbutton and return the
pressure switch regulator to a sufficient value in order to measure
the air pressure existing during the pre-ventilation phase.
AIR PRESSURE SWITCH
The air pressure switch stops the equipment operation if air pressure
is not at the expected value.
The pressure switch must therefore be adjusted so that it is triggered
to close the NO (normally open) contact when the air pressure in the
burner reaches the set value.
If the air pressure switch does not detect a 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 the air pressure switch correct operation, with burner at
the minimum output, increase the adjustment value until reaching the
triggering value which must be followed by the immediate burner lock-
out.
To unblock the burner, press the special pushbutton and return the
pressure switch regulator to a sufficient value in order to measure the
air pressure existing during the pre-ventilation phase.
Air pressure sampling point is upstream the air dampers.
Regulate the air pressure switch after first carrying out all the other
burner adjustments with the air pressure switch adjusted to the start
of the scale.
With the burner operating at a low flow rate (1st flame), slowly turn
the central screw clockwise until the burner locks out.
Then give the screw a half-turn anti-clockwise and repeat burner
start-up to check for proper operation.
If the burner locks out again give the screw another half-turn.
14 / 30
0006160470_202208