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the boiler is on standby awaiting a demand for
heat.
A: start-up instruction.
It is given by the boiler regulator or by the domes-
tic hot water regulator.
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this time ends as soon as the fan motor speed
reaches the load programmed for preventilation.
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this time ends as soon as the programmed igni-
tion load is reached.
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appearance of the ignition arc prior to opening the
gas valve, which occurs at the start of phase 35.
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a flame signal should be present (ionisation cur-
rent > 2.8 µA) before the safety time has elapsed.
If this does not occur, another ignition attempt is
made.
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burner operation following a demand for hot wa-
ter (display 6) or heating (display 7).
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the change of operating position to standby is re-
ferred to as a “shut-down” and occurs when the
demand for heat disappears. The gas valve clo-
ses and the combustion residues are evacuated
by post-ventilation.
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blocking time, for test purposes (about 2 s).
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time required to arrive at the programmed air flow
rate.
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the fan remains on during the post-ventilation
phase.
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obligatory passage from the shut-down position
to standby. This phase is also used to bring the
gas control box to the standby position after ex-
ceptional events such as a reset.
ABCD
Readout
90/123456./7. 8
Phase number
60 61 10 30 31 32 33 34 35 36 37 40 50 51 52 53
Heating demand
!
Flame signal
!
!
Temp. limiting safety device
Gas valve
Ignition
PWM
Fan speed
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Signal required
Signal unacceptable
> Condition required to move on the next stage
Range of possible speeds
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