Flow diagram for burner control unit
Description of state:
Phase
Dis-
Description
play
System
"A"
System start
start
Fan ramp-up, system start
Forced ventilation, system start
Valve test
"P"
Fan ramp-up for valve test
Safety relay test
Relay/valve test BV 1
Test time BV 1
Relay/valve test BV 2
Test time BV 2
Start-up meter, initialisation
Standby
"0"
Standby
Start-up
"1"
Flame amplifier test
Gas fan, air pressure switch and boiler water temperature sensor test
"2"
Fan ramp-up
"3"
Pre-purge
Set the start-up load
"4"
Pre-ignition
"5"
Ignition safety time
Flame detection safety time
Operation
"6"
Flame stabilising time
"7"
Start-up, partial load
Modulating operation
Adjusting shutdown load
Shutdown
"8"
Reheat
Fan ramp-up, post-purge
Post-purge
Waiting
"U"
Waiting for restart
"C"
Waiting for mains gas pressure
Fault
"9"
Forced ventilation fault
states
"10"
Flame tear-off
"11"
Safety shutdown
"F"
Fault shutdown
Flow diagram for burner control unit
(cont.)
Duration
10 s
max. 20 s
20 s
max. 20 s
0.9 s
2 s
1.1 s
2 s
1.1 s
0.1 s
0 ... s
max. 50 s
max. 20 s
max. 20 s
10 s
25 s
2 s
2.3 s
max. 0.51 s
15 s
2.5 s
0 to 24 h
0.1 s
min. 0.5 s,
max. 10 s
max. 20 s
10 s
5 min
5 min
20 s
0 ... s
0 ... s
0 ... s
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