Buderus Logano G234X Installation And Maintenance Instructions Manual page 43

Sequence of normal operation
START Room thermostat (control unit) signals heat requirement
vent damper opens.
PHASE 1
ignition attempt
Ignition spark generator is working
pilot gas valve opens.
PHASE 2 Pilot burner operation
Main burner
Ignition flame burns, burner control
unit reports constant ignition flame.
With constant ignition flame
ignition spark generator stops.
Main gas solenoid valve opens.
Main burner operation
ignition module monitors pilot flame.
END Specified thermostat value (control) reached
Close main and pilot gas valve.
Gas burners go out.
Vent damper closes.
Logano G234X - Technical specifications are subject to change without prior notice.
Heating system inspection and maintenance
or ignition flame does not burn, burner
control unit starts ignition attempt,
switches off after 90 seconds.
Power failure
System switches off.
Does the system restart when power
⇐
is restored?
Ignition flame fault
Main gas valve closes.
Ignition module starts ignition
attempt.
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