GENERAL
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EN
2 .6 .2
Controlled shutdown
–
Boiler temperature control interrupts heat request.
–
The fuel-oil solenoid valve closes and the flame is extinguished.
–
The post-ventilation starts: time factory-set at 15 s. After the burner motor switches off.
–
Burner enters standby.
2 .6 .3
Safety function
A safety shutdown occurs:
–
if a flame signal is present during preventilation (flame monitoring)
–
if no flame is produced within 5 seconds (safety time) of start-up (fuel authorisation)
–
if no flame is produced after an unsuccessful restart attempt in the event of 5 flame 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 rectified.
For further information, see the automatic combustion control unit description.
Boiler
temperature
control
General
power
supply
Motor
Ignition
Transformer
Valve
Flame check
Flame
Pre heater
-
-
tr
to
tp
ts
tpp
tpi
LINE
C
15s
5s
7s
<400s
15s
to
Stand-by: the burner is
waiting for heat demand
tr
Pre heater temps
tp
Pre-Purge time
ts
Ignition safety time
tpi
Post-Ignition time
tpp
Post-purge time
Fig. 6
Summary of Contents for Firebird FB 4 R LN
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