Honeywell Krom Schroeder BCU 480 Manual page 45

Parameters
Restart in the event of flame failure
Parameter 12 = 1: Restart in the event of flame failure.
1x
04 01
>2 s
t
t
SB
Z
t
t
W
If the BCU detects a flame failure after a minimum op-
erating time of 2 s, the valves are closed and the opera-
tion signalling contact is opened within time t
The burner control unit now attempts to restart the
burner once. If the burner does not function, a fault
lock-out occurs. The display blinks and shows the
cause of the fault.
In accordance with EN 746-2, a restart may be con-
ducted only if the safety of the installation is not im-
paired. Restart is recommended for burners which oc-
casionally display unstable behaviour during operation.
The precondition for a restart is that activation of the
restart allows the burner to restart as intended (in all
operating phases). In this case, it must be ensured that
the program sequence started by the BCU matches the
application.
BCU 480 · Edition 03.16l
03 04 88
1
5
4
1
7
9
1
12
V1
16-17
1
18-19
t
t
FS1
SA1
.
SB
45