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Heating system inspection and maintenance
Logano G234X - Technical specifications are subject to change without prior notice.
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
Main burner
Pilot burner operation
Ignition flame burns, burner control
unit reports constant ignition flame.
or ignition flame does not burn, burner
control unit starts ignition attempt,
switches off after 90 seconds.
With constant ignition flame
ignition spark generator stops.
Main gas solenoid valve opens.
Main burner operation
ignition module monitors pilot flame.
⇐
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.
END Specified thermostat value (control) reached
Close main and pilot gas valve.
Gas burners go out.
Vent damper closes.
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