Thermal Control In The " " Mode - Biasi M110.24SM/E Service Manual

9.10
Thermal control in the "
circulator on
Is primary circuit
YES
temperature higher than that
Opeartion lights
starts ignition discharges
Opens gas valve
beginning of ignition period
NO
NO
Is fan rpm
exact?
safety thermostat or flue
NO
temperature probe lock out?
Fig. 9.13
" mode
Switch in the
YES water from the domestic hot
YES
selected?
NO
YES
lock memorised?
starts fan
checks fan rpm
Is fan rpm
NO
exact?
turns on lock--- out light
Opeartion lights
End of wait
YES
period?
YES
End of ignition
period?
NO
YES
YES
YES
function mode
Taking
NO
water circuit?
Main circuit pressure
switch consense?
NO
temperature higher than 110˚C?
YES
flame presence?
NO
flame presence?
NO
closes gas valve
stops fan
interrupts ignition discharges
memorizes lock
turns on lock--- out light
reset push--- button
pressed?
flame presence?
Electronic control/ignition p.c.b.
circulator off
fan still
YES
stop circulator (3min)
NO Operation lights
cancels lock
Is flue
YES
beginning of wait period
YES
interrupts ignition discharges
YES
gas valve open
fan runs
YES
NO
NO
21