Viessmann Vitocrossal 200 CM2 186 Service Instruction page 48

Flow Diagram
Burner Control Unit Flow Diagram
State description:
Phase Display
System start "A"
Relay test "P"
Standby "0"
Start-up "1"
"2"
"3"
"4"
"5"
Operation "6"
"7"
Shutdown "8"
Standstill "U"
"C"
Fault states "9"
"10"
"11"
"F"
48
(continued)
Description
System start
Initialization of fault meter
Test power, gas pressure
Fan ramp-up, system start
Forced ventilation, system start
Fan ramp-up for test
Safety relay test
Disable relays BV1 and BV2
Relays BV1 and BV2 test
Ignition relay test
Disable safety relay
Start-up meter, initialization
Standby
Flame signal amplifier, test
Gas fan and air pressure switch test
Fan ramp-up
Pre-purge
Adjusting start-up load, test APS1
Pre-ignition
Ignition safety time
Flame detection safety time
Flame stabilizing time
Start-up partial load
Modulating operation
Adjusting shutdown load
Reheat, test APS2
Fan ramp-up, post-purge
Post-purge
Waiting for restart
Undervoltage condition exists or gas pressure too
low (inlet pressure switch open).
Forced ventilation fault
Flame loss
Safety shutdown
Fault shutdown
Vitocrossal 200 CM2 186 to 311 Service
Duration
10 seconds
0.1 second
1 second
max. 20 seconds
20 seconds
max. 20 seconds
0.9 second
0.9 second
0.9 second
0.9 second
0.9 second.
0.1 second
0 ... seconds
max. 50 seconds
max. 20 seconds
max. 20 seconds
~30 seconds
1.9 seconds
2 seconds
2.3 seconds
max. 51 seconds
15 seconds
20 seconds
0 to 24 hours
0.1 seconds
max. 10 seconds
max. 60 seconds
max. 20 seconds
10 seconds
1 minute
5 minute
20 seconds
0 ... seconds
0 ... seconds
0 ... seconds