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B Flame is established
•
flame relay (FR) is energised, whereupon terminals 8 and 3 are linked. Opening of
preheater thermostat contact does not shut down the burner during flame.
•
burner has started
•
post-ignition 2 s (control from terminal 7).
C Control unit/burner in normal operating condition
•
control program of control unit ends
•
burner remains operating supervised by control unit (flame) and controlled by
regulating thermostat.
D Controlled shut-down with regulating thermostat
•
burner motor stops
•
solenoid valve closes
•
flame
extinguishes.
See chapter ”Control Functions in the Event of Faults”.
