Thermal Control In The; Mode - Biasi RIVA COMPACT M90E.24S Service Manual

Electronic starting control p.c.b.
9.13

Thermal control in the "

Circulator on
Is domestic
hot water outlet temperature
YES
lower than that
NO
end of ignition
NO
period?
YES
Fig. 31
22

" mode

Switch in the function mode
YES
NO
required?
YES
NO
NO
NO
Air pressure switch at
work?
NO
YES
interrupts ignition discharges
NO
YES
Air pressure switch at
work?
Taking
water from the domestic hot
water circuit?
lock memorised? NO
Air pressure switch at
rest?
Air pressure switch at
work?
presence of flame?
starts ignition discharges
opens gas valve
beginning of ignition period
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
Circulator off
NO
Ignition device off
Ignition device off
cancels lock
YES
starts fan
YES
beginning of wait period
YES
YES
interrupts ignition discharges
gas valve open
YES
NO
YES
YES
closes gas valve