BCU 460, BCU 465 · Edition 11.19 92
Parameters
Parameter A043 = 2: low fire over-run until actuator
feedback. The air actuator is closed with a deactivated
start-up signal in the event of a controlled shut-down.
The gas valves remain open for the programmed dura-
tion depending on parameter A039 (Flame mode) or
A139 (Flameless operation) or until the air actuator is
closed. The gas valves are closed immediately in the
event of a flame failure. A flame failure during the over-
run does not result in a fault lock-out.
Parameter A043 = 3: low fire over-run, time-bound.
BCU 460..F3
µC
VAS VAG
VR..L
V1 V2
61
60
22
66
UVS
The burners are initially powered down to low-fire rate
and remain in operation for the programmed duration
depending on parameter A039 (Flame mode) or A139
(Flameless operation). Flame control is still operational.
It must be ensured that no excess gas occurs.
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