66
Description of state:
Phase
Display
Description
Duration
System
start
"A"
System start
10 s
Fan ramp-up, system start
max. 20 s
Forced ventilation, system start
20 s
Valve test
"P"
Fan ramp-up for valve test
max. 20 s
Safety relay test
0.9 s
Relay/valve test BV 1
2 s
Test time BV 1
1.1 s
Relay/valve test BV 2
2 s
Test time BV 1
1.1 s
Start-up meter, initialisation
0.1 s
Standby
"0"
Standby
0 ... s
Start-up
"1"
Flame signal amplifier, test
max. 50 s
Gas fan, air pressure switch and boiler wa-
ter temperature sensor test
max. 20 s
"2"
Fan ramp-up
max. 20 s
"3"
Pre-purge
10 s
Adjusting start-up load, test WD 1
1.9 s
"4"
Pre-ignition
2 s
"5"
Ignition safety time
2.3 s
Flame detection safety time
max. 0.51 s
Operation
"6"
Flame stabilising time
15 s
"7"
Start-up partial load
20 s
Modulating operation
0 to 24 h
Adjusting shutdown load
0.1 s
Switch off
"8"
Reheat, test WD 2
min. 10 s,
max. 60 s
Fan ramp-up, post-purge
max. 20 s
Post-purge
10 s
Waiting
"U"
Waiting for restart
5 min
"C"
Waiting for mains gas pressure
5 min
Fault states
"9"
Forced ventilation fault
20 s
"10"
Flame tear-off
0 ... s
"11"
Safety shutdown
0 ... s
"F"
Fault shutdown
0 ... s
Burner control unit flow chart
Burner control unit flow chart
(cont.)
5794 780 GB