Honeywell BCU 465 - Combustion Mode

BCU 460, BCU 465 · Edition 11.19 98
Parameters
11.8.12 Combustion mode
Parameter A074
The type of combustion in which the ignition takes
place can be set using parameterA074.
Parameter A074 = 0: Flame mode. The burner is al-
ways started with ignition in Flame mode and in High
temperature mode. Flame control is provided in High
temperature mode by the high temperature monitoring
system.
Parameter A074 = 1: Flameless/menox®. Only with
BCU..D2.
FCU
Process Control (PCC)
PZL
DG
BCU 465..F1
µC
V1 V2
616067
65
36
HT
FLO
VR..N
PLC
STM
The High temperature and Flameless mode inputs
(terminals 6 and7) must receive a signal to switch to
Flameless mode. The timing of the switchover is con-
trolled by the parameter “Flameless operation” (A064).
In Flame mode (<850°C), the burner is started con-
ventionally (as with A078=0) with the pre-ventilation
timet
VL
defined in parameter A036. The air control
valve is in the “high” position for Flame mode.
0302 04
2
1
51
61
60
6
1
7
36
t
t
FS1
t
SA1
t
VL
65
PZL
HT
ϑ
42
FLO
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 (FLO) must be supplied to the BCU by
a separate control unit (terminal7).
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