Viessmann Vitocrossal 300 Service Instructions Manual page 39

Burner control unit flow chart
Phase
08 VPS decision: Valve leak test
09 VPS: Empty intermediate valve space
10 VPS test time: Valve 1
11 VPS: Fill intermediate valve space
12 VPS detection: Gas pressure
13 VPS test time: Valve 2
14 Pre-purge time
16 Ignition setting
17 Gas detection: Min. gas pressure switch
18 Pre-ignition time
19 Ignition safety time (SZA)
20 SZA flame detection
21 Flame stabilising time
23 Transition to control mode
24 Control mode
25 Transition after controlled shutdown
32 Burner run-on time
33 Post-purge time
34 Restart blocking time
01 Waiting for heat demand
In the case of fault shutdown:
35 Gas shortage: Min. gas pressure switch
36 On hold program
(cont.)
Burner control unit flow chart
Duration
0.1 s
1 to 3 s
1 to 240 s
1 to 3 s
0.1 s
1 to 240 s
0 to 1 h
max. 2 min
0 ...
0 to 1 min
0.5 to 9.4 s
0.5 s
1 to 200 s
max. 2 min
0 ...
1 to 30 s
1 to 60 s
0 to 1 h
0 to 1 h
0 ...
0 ...
0 ...
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