Ignition And Control Sequence - Biasi RIVA PLUS M90S.24S Service Manual

Full sequence ignition device
10.4

Ignition and control sequence

NO
end of ignition
NO
period?
YES
Fig. 42
26
supply from the electronic control circuit
YES
NO
NO
NO
Air pressure switch at
work?
beginning of ignition period
NO
YES interrupts ignition discharges
NO
YES
Air pressure switch at
work?
lock memorised?
Air pressure switch at
rest?
Air pressure switch at
work?
presence of flame?
YES
starts ignition discharges
opens gas valve
flame presence?
closes gas valve
stops fan
memorizes lock
turns on lock--- out light
reset push--- button
pressed?
flame presence?
Safety thermostat
NO
opens the circuit?
NO
NO
cancels lock
YES
starts fan
YES
beginning of wait period
YES
YES
interrupts ignition discharges
gas valve open
YES
NO
YES
closes gas valve