Installation manual

SAVIO PLUS COMBI MANUAL 13
5. Electric Diagrams Cont.
5.1 Sequence of Operation
Is
primary circuit temp higher
than selected temp
Request for heat from
thermostat
Circulator off
Ignition device off
Starts the circulator
Supplies the ignition device
YES
NO YES
NO
Is the boiler in lockout?
Air pressure switch open?
Fan starts
Air pressure switch closed?
Begin wait period
Presence of flame?
Air pressure switch closed?
Starts ignitors
Opens gas valve
Begins ignition timing
Flame presence?
Closes gas valve
Stops fan
Interrupts ignitor
Boiler lockout
End of ignition period?
Interrupt igniter
Gas valve open
Reset push – button
pressed
Flame presence?
Safety thermostat
Opens the circuit?
Flame presence?
Close gas valve
NO
YES
YESNO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES