Viessmann Vitocrossal 200 Service Instructions For Contractors page 36

Burner control unit
Burner control unit flow chart
Phase Display
Relay test "P"
Standby "0"
Start-up "1"
"2"
"3"
"4"
"5"
Operation "6"
"7"
Shutdown "8"
Waiting "U"
"C"
Fault status "9"
"10"
"11"
"F"
36
(cont.)
Description
Fan ramp-up for test
Safety relay test
Disable relays BV1 and BV2.
Relays test BV1 and BV2
Ignition relay test
Disable safety relay.
Start-up meter, initialisation
Standby
Flame signal amplifier test
Gas fan and air pressure switch 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
Adjust 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
max. 20 s
0.9 s
0.9 s
0.9 s
0.9 s
0.9 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
1 min
5 min
20 s
0 ... s
0 ... s
0 ... s