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5790 733 - 07
Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Burner Control Unit
State description:
Burner Control Unit Flow Diagram
(continued)
Phase
Display
Description
Duration
System start
“A”
System start
10 seconds
Fan ramp-up, system start
max. 20 seconds
Forced ventilation, system start
20 seconds
Relay test
”P“
Fan ramp-up for valve test
max. 20 seconds
Safety relay test
0.9 second
Relay/valve test V1
2 seconds
Test time V1
1.1 seconds
Relay/valve test V2
2 seconds
Test time V2
1.1 seconds
Start-up meter, initialization
0.1 second
Standby
”0“
Standby
0 ... seconds
Start-up
”1“
Flame signal amplifier, test
max. 50 seconds
Gas fan, air pressure switch and boiler water
temperature sensor test
max. 20 seconds
“2“
Fan ramp-up
max. 20 seconds
“3”
Pre-purge
10 seconds
Adjusting start-up load, test WD1
1.9 seconds
“4”
Pre-ignition
2 seconds
“5”
Ignition safety time
2.3 seconds
Flame detection safety time
max. 0.51 second
Operation
“6”
Flame stabilizing time
15 seconds
“7”
Start-up partial load
20 seconds
Modulating operation
0 to 24 hours
Adjusting shutdown load
0.1 seconds
Shutdown
“8”
Reheat, test WD2
min. 10 seconds
max. 60 seconds
Fan ramp-up, post-purge
max. 20 seconds
Post-purge
10 seconds
Waiting
”U“
Waiting for restart
5 minutes
”C“
Waiting mains, gas pressure
5 minutes
Fault states
“9”
Forced ventilation fault
20 seconds
“10”
Flame tear-off
0 ... seconds
“11”
Safety shutdown
0 ... seconds
“F”
Fault shutdown
0 ... seconds
