Honeywell BCU 460 Technical Information page 76

Parameters
The precondition for this operating mode is that an
external flame supervision device ensures the pres-
ence of the flame in a fail-safe manner indirectly via
the temperature. For this purpose, we recommend a
safety temperature monitor with double thermocouple
(DIN 3440). The flame must be monitored again by
conventional means (UV sensor or flame rod) in the
event of sensor discontinuity or short-circuit, failure of
the safety temperature monitor or power failure.
Only if the temperature at the furnace wall has ex-
ceeded 750°C may voltage be applied to the HT input
(terminal 6) so as to activate High temperature mode.
00 02
t
Z
t
SA1
If the temperature in the furnace chamber drops below
750°C, the HT input must be disconnected from the
electrical power supply and the furnace must then be
operated with flame control.
BCU 460, BCU 465 · Edition 11.19
03 04 8888
L
L1
35
1
ϑ
6
HT
51
22
60
V1
61
V2
62
V3
82
96
t
t
FS1
The BCU then responds, depending on setting:
Parameter A006 = 0: Off.
The High temperature mode function is switched off.
Flame control takes place dependent on the setting in
parameter I004 (using flame rod, UVS sensor or UVC
sensor).
Parameter A006 = 3: continuous operation.
04 04
The burner remains in operation and the BCU performs
flame control again (recommended in the case of ioni-
zation control or UV control with UVC).
▼
8888
L
L1
35
1
ϑ
6
HT
51
22
60
V1
61
V2
62
V3
82
96
t
76