Honeywell BCU 465 - Page 82

BCU 460, BCU 465 · Edition 11.19 82
Parameters
The switchover from Flame mode to Flameless mode
is performed either immediately or the next time the
burner is started depending on the setting made in
parameterA064. To switch to Flameless mode, the
HT signal from the STM (terminal6) and the signal for
Flameless mode must be supplied to the BCU from a
separate control unit (terminal7).
In Flameless mode (>850°C), the burner is started
with the pre-ventilation timet
VLM
defined in parameter
A028. No ignition using the transformer takes place
during safety timet
SA1
. The gas valves V1 and V3 are
opened at the start of the safety timet
SA1
.
0302 04
t
t
FS1
t
SA1
t
VLM
65
2
1
3
PZL
51
61
62
60
6
1
7
36
42
HT
ϑ
FLO
The air pressure switch and the position of the IC are
checked via terminal36 on theBCU.