Viessmann VITOCROSSAL 200 Service Instructions Manual page 66

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