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GENERAL
INTEGRATED FLAME CONTROL
Electronic flame control unit intended for direct ignition of the main burner by means a capacitive discharge spark generator
and flame detection control by means of the ionisation phenomenon.
OPERATING SEQUENCE
When the request contact is closed and after checking for the presence of air (MBS) or closure of the flue gas thermostat
(MB), the self-test starts during which the flame amplifier and the components associated with safety functions are tested.
An amplifier failure due to a flame detected condition or failure of a component that performs a safety function inhibits the
start of the ignition sequence.
After the self-test time the safety time starts during which the spark generating device and the gas electrovalve output are
powered.
If the burner is ignited and the flame signal detected, the spark is maintained active for a time equal to the post-ignition
time (at maximum up to the end of Ts).
If the flame goes out during Ts, the spark is reactivated.
When the safety time has elapsed, the operating condition is reached.
If ignition fails at the first attempt, there is an interventilation time and then a further two ignition attempts. When this time
has elapsed and ignition has failed, a non-volatile locking stop occurs: the power to the gas electrovalve control output
and the spark generating device is cut.
The double attempt is repeated after a further flame detection phase and at each power-on (after 1h).
TIMES AND OPERATING PROGRAM
- Self-test time:
2.2s +10% / -10% A 230VAC 25°C
- Safety time:
10s
- Intervention time at power off:
< 1s
SAFETY TESTS
- At startup and at each periodic inspection the safety functions of the electronic control must be checked.
- Run an operating cycle without fuel and check that the locking stop occurs with relative signalling at the end of the “Safety
time”.
- Run an operating cycle with fuel and check after the safety time has elapsed that when the gas flow is cut off and the
cycle is repeated, the locking stop occurs.
- Check that the intervention of the regulators, limiters or safety devices stop operation in conformity with the type of appli-
cation and the operating modes.
CHECKING THE IONISATION CURRENT (CONTROL UNIT)
The ionisation current must be at least 3-4 times the minimum value ( 4-6µA).
To check the ionisation current use a multimeter with full scale of 200ìA DC.
Should the flame signal be insufficient, check that the end of the detection electrode is fully immersed in the flame and that
the burner body is properly connected to the earth of the control electronics.
