Thermal Control In The; Mode - Biasi GARDA M90F.24S Service Manual

Electronic starting control p.c.b.
9.11

Thermal control in the "

See functioning with the function
control in the

mode

(sec. 9.12)
Circulator off
Operates motorised valve
Ignition device off
NO
end of ignition
NO
period?
YES
Fig. 39
20
" mode
water from the domestic hot
YES
NO
YES
NO
NO
NO
Air pressure switch at
work?
NO
YES interrupts ignition discharges
NO
YES
Air pressure switch at
work?
Taking
water circuit?
Request for heat from
room thermostat?
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
Is primary circuit
NO
temperature higher than that
selected?
YES
Starts the circulator
YES
Operates motorised valve
Supplies the ignition device
cancels lock
YES
starts fan
YES
beginning of wait period
YES
YES
interrupts ignition discharges
gas valve open
YES
NO
YES
NO
YES
closes gas valve