Honeywell BCU 465 - Page 76

BCU 460, BCU 465 · Edition 11.19 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.
t
SA1
t
Z
88880402 0300
ϑ
t
t
FS1
V1
V2
V3
HT
L1
1
35
L
51
22
60
61
62
6
96
82
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.
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.
888804 04
ϑ
t
1
35
L L1
51
22
60
V1
61 V2
62 V3
6
HT
96
82
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).
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