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NATURAL GAS IGNITION AND REGULA-
TION
• Position the first flame gas flow rate regulation cam on the
electric servomotor to an opening angle approximately between
15° and 20°.
•
Now switch on the switch START/STOP switch of the burner
panel. The control equipment thus receives voltage and the
programmer causes the burner to switch on as described in the
chapter “operation description”. During pre-ventilation, make
sure that the air pressure control switch changes its status (from
the closed position without pressure measurement to the closed
position with pressure measurement). If the air pressure switch
does not detect sufficient pressure, the ignition transformer is
not switched on, nor are the gas valves, and so the equipment
is stopped in “lock-out” mode.
• On first switching on repeated “lock outs” may occur due to the
following reasons:
•
The gas piping is not being freed of 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 in
-
stability 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 regulation device, by closing or
opening further the air passage between combustion head and
gas diffuser.
• Correct the first stage air supply flow rate through the screw/s
(12) at the bearing (13).
-
In clockwise rotation the air flow increases
-
In anticlockwise rotation the air flow decreases
• After adjusting the regulation for the first ignition, turn off the
burner and close the electrical circuit commanding inclusion of
the second stage.
DANGER / CAUTION
Check that the electric servomotor second stage gas flow
rate regulation cam is positioned at 130°.
•
Switch the burner on again activating the main switch -1 on the
synoptic panel. The burner will switch on automatically and acti-
vate 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:
• Adjust the gas flow using the valve pressure regulator, until you
obtain optimal combustion values, without modifying the initial
air setting for diesel oil. Consult the instructions related to the
single stage gas valve model installed. Avoid keeping the bur-
ner 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%)
At the end of burner adjustment in the second stage, open the
electric circuit controlling the 2nd stage activation without varying
the regulation of the gas valve already undertaken in the previous
point.
• Set the first stage gas flow rate to the needed value through the
electric servomotor.
•
If necessary, correct the combustion air supply adjusting the
screw/s (12) as described previously.
•
Check the combustion parameters in the 1st stage with ap-
propriate instruments (CO2 MAX=10% O2 MIN= 3% CO
MAX=0.1%)
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