BCU 480 · Edition 03.16l
43
Parameters
Main burner
Parameter 11
This indicates the number of possible start-up attempts
of the main burner.
In accordance with EN 746-2, three start-ups are per-
mitted in specific cases if the safety of the installation
is not impaired (note the requirements of the Stand-
ards).
If no flame is detected during start-up, either a fault
lock-out occurs or 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.
1 start-up attempt
Parameter 11 = 1
t
SA1
t
Z
04
06
02
03
00
t
t
FS1
t
SA2
9
12
V1
1
14
V2
2
2
16-17
1
24
21
06
88
4
5
1
7
18-19
28-29
ϑ
1
ϑ
2
If no flame forms during the start-up of the main burner,
a fault lock-out is performed after expiry of time t
SA2
.
The display blinks and shows the cause of the fault.
2 or 3 start-up attempts
Parameter 11 = 2, 3
t
SA2
t
SA2
t
SA2
t
SA1
t
Z
04
06
02
03
00
t
t
FS1
9
12
V1
1
14
V2
2
2
16-17
1
24
21
06
88
4
5
1
7
18-19
28-29
t
W
06
06
05
05
t
W
ϑ
1
ϑ
2
If several start-up attempts are set at the works and if
the BCU does not detect a flame signal during start-
up, it closes valve V2 after the safety time t
SA2
has
expired and attempts to start up again. After the last
programmed start-up attempt has been completed, the
burner control unit conducts a fault lock-out. The dis-
play blinks and shows the cause of the fault.