Honeywell BCU 460 Technical Information page 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
60
22
66
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
BCU 460, BCU 465 · Edition 11.19
V1 V2
VAS VAG
61
VR..L
(Flameless operation). Flame control is still operational.
It must be ensured that no excess gas occurs.
92