Working Cycle - Ferroli COMPACT ECO 3 Installation And Maintenance Manual

WORKING CYCLE

When switched on the burner motor starts and the 15-second pre-ventilation phase begins.
During this phase the ignition transformer comes on and the inter-electrode arc is generated.
Once pre-ventilation is over the fuel on-off valve opens and the fuel starts flowing out of the
nozzle thus igniting a flame.
After another 3 seconds (post-ignition phase) the inter-electrode arc is switched off. If the
flame fails to appear within 10 seconds of the end of pre-ventilation the burner is shut down.
If the flame accidentally goes out during routine operation an automatic re-ignition sequence
begins. Burner shutdown is indicated by the boiler system warning light and/or by the room
thermostat indicator.
Burner restart is effected by pressing the reset button.
Necessary input signals
Output signals
UK
28
Ignition cycle Ignition failure
t1 Pre-ventilation and pre-ignition
t2 Post-ignition
t3 Max safety time