Description Of State - Viessmann Vitocrossal CRU 800 Service Instructions For Contractors

Flow diagram for burner start

Description of state

Phase "Service"
display
System start "A"
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"
(cont.)
Description
System start
Fan ramp-up, system start
Forced ventilation, system start
Fan ramp-up for test
Safety relay test
Disable BV1 relay.
BV1 relay test
Ignition relay test
Disable safety relay.
Ramp up to flue gas damper test speed.
Check flue gas damper.
Start-up meter, initialisation
Standby
Flame signal amplifier test
Gas fan and air pressure switch test
Fan ramp-up
Pre-purge
Adjust start-up load, WD 1 test.
Pre-ignition
Safety time
Flame stabilising time
Start-up, partial load
Modulating operation
Adjust shutdown load.
Reheating, WD 2 test.
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
Burner control unit
Duration
10 s
max. 20 s
20 s
max. 20 s
0.9 s
0.9 s
0.9 s
0.9 s
0.9 s
5 s
max. 60 s
0.1 s
0 ... s
max. 50 s
max. 20 s
max. 15 min
30 s
25 s
1 s
max. 2.6 s
15 s
12 s
0 to 24 h
10 s
1 s, max. 30 s
max. 20 s
10 s
min. 1 min
min. 5 min
20 s
0.5 s
0 ... s
0 ... s
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