Honeywell BCU 460 Technical Information page 35

Burner control units
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max. 3 start-up attempts
or fault lock-out
Function
03
Flame proving period t
running (P23)
In the event of flame failure:
fault lock-out
04
Operation signalling
contact closes
and V2 opens
In the event of flame failure:
restart or
fault lock-out
04
Controlled shut-down
via ϑ signal
00
If min. burner on time t
has elapsed:
operation signalling
contact opens,
V1 and V2 close,
min. burner pause time t
starts to elapse (P21)
BCU 460, BCU 465 · Edition 03.16l
FS
The air valve can also be set to
open with V2 or to be activated
externally (display
rameter 30.
B
BP
This completes start-up. An adjustable min.
burner on time t
burns for a defined period even if the start-
up signal (ϑ) is switched off beforehand.
The burner can also be started manually
with the aid of the switch on the BCU. Volt-
age must be applied continuously to termi-
nals 1, 4 and 5 in order for this to occur.
A4
The BCU can also be operated in Manual
) via pa-
mode for start-up.
Start-up without flame signal
If no flame is detected during the safety
time t
SA
up to two further start-up attempts occur.
The required functions and, if applicable,
the number of start-up attempts must be
specified when ordering. (Parameter 10,
"Burner start-up attempts").
Behaviour in the event of flame failure
during operation
If the flame fails during operation, either
an immediate fault lock-out or a restart
occurs. This procedure can be set via the
optical interface (parameter 12, "Burner
restart").
ensures that the burner
B
, either a fault lock-out occurs or
35

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