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Legend
10 Legend
88
Display
88
Blinking display
Ready
Safety interlocks (Limits)
Burner start-up signal
Ignition transformer
Gas valve
Air valve
Purge
P
Ext. air valve control
A
Flame signal
Burner operating signal
Fault signal
Reset
Input signal
Output signal
Flame simulation check
t
Waiting time ≥ 2 s
W
t
Safety time on start-up 3 s, 5 s or 10 s
SA
t
Safety time during operation < 1 s or < 2 s
SB
t
Ignition time 2 s, 3 s or 6 s
Z
t
Flame simulation delay time 25 s
LV
Input/Output safety circuit
BCU 440 · Edition 01.17
33
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