Buderus Logano GC124 II/SP Installation And Service Instructions Manual page 56

16 Boiler inspection and maintenance
START
PHASE 1
Ignition attempt
PHASE 2
Main burner
operating
END
56
Room thermostat (control) signals heat requirement
Ignition spark generator operates
• ignition gas valve opens.
Ignition flame burns, automatic
ignition signals steady ignition
flame.
Pilot flame stand by
• ignition spark generator stops.
• main gas solenoid valve opens.
Main burner operation
• automatic ignition monitors ignition flame.
Specified thermostat value (control) reached
Main and ignition gas valves close, gas burners ex-
tinguished, vent damper closes.
Installation and maintenance instructions Gas Boiler Logano GC124 II/SP • Issue 07/2006
Vent damper opens.
Ignition burner operation
or ignition flame does not burn, au-
tomatic ignition starts ignition at-
tempt, switches off after 90
We reserve the right to make any changes due to technical modifications.
seconds.
Power interruption
System switches off. Does
the system restart when
power is restored?
Pilot flame fault
Main gas valve closes,
ignition module starts
ignition attempt.