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• 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.
- The “lock out” with flame present may be caused by instabi-
lity in the ionisation area, due to an incorrect air/gas ratio.
• Correct the air flow using the screw(s) -11 near the bearing -12.
- clockwise rotation: the air flow increases
- anticlockwise rotation: the air flow decreases.
• It may occur that the ionisation current is disturbed by the di-
scharge current of the ignition transformer (the two currents
have a common path on the burner’s “mass”) so the burner
locks out due to an insufficient ionisation. Invert the supply
(230V side) of the ignition transformer.
• This problem may also be caused by an insufficient “ground
connection” to the burner’s casing.
SECOND STAGE POWER REGULATION.
After the regulation for first ignition, press the switch on the con-
nector -4 towards the maximum.
Check that the electric servo-
motor second stage gas flow rate regulation cam is positio-
ned at 120°.
• To regulate the gas flow operate the valve pressure regulator.
Consult the instructions related to the installed gas valve model.
Avoid keeping the burner running if the heating capacity is gre-
ater than the maximum amount allowed for the boiler, to avoid
damaging it.
• To regulate the air flow rate, use the screws -12, and correct the
rotation angle of the air shutter and put it in the suitable position
to guarantee the right quantity for the power burned.
• Check the combustion parameters with appropriate instruments
(C02 max= 10%, O2 min=3%, CO max=0,1%)
FIRST STAGE POWER REGULATION.
After regulation of the burner in the second stage, return the bur-
ner to the first stage. Press the switch on the connector -4 towards
the minimum without varying the already performed regulation of
the gas valve.
• Regulate the 1st stage gas flow rate to the required value using
the servomotor's cam for minimum output regulation. (See Ser-
vomotor cam regulation).
• If necessary, correct the combustion air supply adjusting the
screw(s) -12.
• Check the combustion parameters in the 1st stage with ap-
propriate instruments (C02 max= 10%, O2 min=3%, CO
max=0,1%)
• Check the efficiency of the thermostats or boiler pressure swi-
tches (they should shut down the burner when triggered).
ADJUSTING THE FLOW RATE FOR IGNITION
• Once regulation of the minimum output has been carried out,
the burner needs to be switched off and check that ignition
occurs properly. If necessary, it is possible to optimise burner
regulation during ignition, proceeding as follows:
- Regulate the gas flow rate upon ignition, using the cam IV
(see Servomotor cam regulation). It is usually advisable to
set cam IV at a slightly higher angle than the first stage cam
III.
• Correct the air flow rate using the screw(s) (12).
CAUTION / WARNING
After the regulation, check that the Cam V value is greater
than that of Cam IV (5°÷10°).
Summary of Contents for TBG 35 MC
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