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NATURAL GAS IGNITION AND
REGULATION
FIRST IGNITION POWER ADJUSTMENT
•
Now turn on the burner panel switch START/STOP switch. The
control equipment is powered and the programmer activates
the burner as described in the chapter “Operation description”.
During pre-ventilation, make sure that the air pressure switch
changes its status. If the air pressure switch does not detect
sufficient pressure, the ignition transformer is not switched on,
nor are the gas valves, therefore the equipment “locks out”.
•
During the first ignition several “lock outs” may occur due to the
following reasons:
•
The gas piping has not been bled from air correctly and so there
is not enough gas to provide a stable flame.
•
A “lock out” with flame presence could be caused by flame
instability 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. The same problem may be caused by incorrect
air/gas distribution in the combustion head. This can be solved
through the combustion head adjustment device, by closing or
opening further the air passage between combustion head and
gas diffuser.
•
Correct the air flow in first stage using the screw(s) (11)
corresponding to the bearing (12).
- Clockwise rotation increases air flow rate;
- In anticlockwise rotation the air flow decreases
SECOND STAGE POWER REGULATION.
•
After adjusting the regulation for the first ignition, turn off the
burner and close the electrical circuit commanding inclusion of
the second stage.
•
Check that the electric servomotor second stage gas flow
rate regulation cam is positioned on 130°.
•
Switch the burner on again activating the main switch (1) on
the synoptic panel. The burner will switch on automatically
and activate the second stage. With the aid of appropriate
instruments, attend to the regulation of the air and gas flow
according to the procedures subsequently described:
•
To regulate the gas flow operate the valve pressure regulator.
Consult the instructions related to the single stage gas valve
model installed.Avoid keeping the burner running if the heating
capacity is greater than the maximum amount allowed for the
boiler, to avoid damaging it.
•
Check the combustion parameters with appropriate instruments
(CO2 MAX=10% O2 MIN= 3% CO MAX=0.1%)
FIRST STAGE POWER REGULATION
After regulation of the burner in the second stage, return the
burner to the first stage. Set the switch on the printed circuit to the
1st stage position without varying the adjustment of the gas valve
already performed previously.
•
Set the first stage gas flow rate to the needed value, as
described above.
•
Adjust the gas flow in the 1st stage to the desired value using
the electric servomotor.
•
If necessary, correct the combustion air supply adjusting the
screw(s) (11) as described previously.
•
Check the combustion parameters in the 1st stage with
appropriate instruments (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 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 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.
•
During burner ignition, when it passes to the first stage, the air/
gas servomotor takes for a few seconds the burner to a delivery
higher than the first stage.
TBML_ACC_REG_001
Содержание TBML 200 MC
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