GENERAL
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2.6.2 Controlled shutdown
– Boiler temperature control interrupts heat request.
– The fuel-oil solenoid valve closes and the ame is extinguished.
– The post-ventilation starts: time factory-set at 30 s. After the burner motor switches off.
– Burner enters standby.
2.6.3 Safety function
A safety shutdown occurs:
– if a ame signal is present during preventilation (ame monitoring)
– if no ame is produced within 5 seconds (safety time) of start-up (fuel authorisation)
– if no ame is produced after an unsuccessful restart attempt in the event of 5 ame failures
during operation.
A safety shutdown is indicated by the malfunction lamp lighting up and it is then only possible to
reset the burner by pressing the reset button after the cause of the malfunction has been rectied.
For further information, see the automatic combustion control unit description.
1 2 3 4 5 6 87
7s20s
5s
---- 30s
LINE
C
Boiler
temperature
control
power
supply
Motor
Ignition
Transformer
Valve
Flame check
Flame
3
Prepurge time
4
Safety time
5
Post-Ignition time
8
Post-purge
Fig. 6
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