Honeywell BCU 465 - Bcu 460

BCU 460, BCU 465 · Edition 11.19 38
Low NOx mode (flameless operation)
5.2 BCU..D2
The BCU coordinates the signals for starting the burner
and the fail-safe monitoring of the burner in Flame
mode. In Flameless mode, the BCU switches off the
ignition device and flame control. The furnace cham-
ber temperature must be monitored by a safety tem-
perature monitor (STM) for flameless operation. This
function must satisfy the requirements of a protective
system pursuant to EN746-2.
BCU 460
LM..F3
µC
FCU 500
Process control (PCC)
22
3
81
82
95
96
35
2
P
4
A
1
Start 1
6
HT
7
FLO
PLC
Parameters A006 = 3, A074 = 1 and A078 = 0 must be
set to switch to Low NO
x
mode. The BCU..D2 must
signal via terminal6 that the required temperature for
high temperature operation has been reached. A higher
switching point of 850°C is required for flameless
operation. Flameless mode is enabled via the input at
terminal7: depending on parameterA064, the system
is either switched over immediately or the next time the
burner starts with the parameters of pre-ventilation/
flameless, burner application and settings for the con-
trol element coordinated for flameless operation.
Parameter settings for switching between Flame mode
and Flameless mode, see pages79 (Burner applica-
tion), 96 (Pre-ventilation/flameless), 98 (Com-
bustion mode) and97 (Flameless operation).
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