BCU 580 · Edition 11.15
61
10 .3 .2 Burner 2 start-up attempts
Parameter 08
Up to three start-up attempts are possible in certain condi-
tions. In accordance with EN 746-2, a restart may be con-
ducted only if the safety of the installation is not impaired.
Note the requirements of the standards!
For FM and CSA approved units, it is only possible to select
one start-up attempt (P08 = 1).
This parameter defines the maximum number of possible
start-up attempts of burner 2.
If no flame is detected during start-up, an immediate fault
lock-out (P08 = 1) or up to two additional start-up attempts
(P08 = 2, 3) are performed depending on parameter 08.
Parameter 08 = 1: 1 start-up attempt.
t
SA1
t
Z
04
06
02
03
00
t
t
FS1
t
SA2
06
5
13
V1
1
14
V2
2
ϑ
1
ϑ
2
8
4
88
1
46
11
9
41
42
L1
1
43
2
If no flame is formed during the start-up so that at the end of
the safety time t
SA1
no flame signal is detected, this will result
in a BCU safety shut-down with subsequent fault lock-out. The
fault message
06
will flash in the BCU display depending on
the burner operating mode.
Parameter 08 = 2, 3: two or three start-up attempts.
t
SA2
t
SA2
t
SA2
t
SA1
t
Z
04
06
02
03
00
t
t
FS1
06
t
W
06
06
05
05
t
W
5
13
V1
1
14
V2
2
ϑ
1
ϑ
2
8
4
88
1
46
11
9
41
42
L1
1
43
2
If no flame is formed during the start-up so that at the end
of the safety time t
SA2
no flame signal is detected, the BCU
closes the gas valves and repeats the start-up. Each start-up
attempt begins with the parameterized start-up behaviour.
If the safety time t
SA2
elapses without a flame signal having
been detected, even after the last parameterized start-up
attempt, this will result in a BCU safety shut-down with sub-
sequent fault lock-out. The fault message
06
will flash in the
BCU display depending on the burner operating mode.
Parameters > Behaviour during start-up
