BCU 580 · Edition 11.15l
63
Parameters
10 .3 Behaviour during start-up
10 .3 .1 Burner 1 start-up attempts
Parameter 07
Up to three start-up attempts are possible in certain
conditions . In accordance with EN 746-2, a restart
may be conducted only if the safety of the installa-
tion 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 (P07 = 1) .
This parameter defines the maximum number of pos-
sible start-up attempts of burner 1.
If no flame is detected during start-up, an immediate
fault lock-out (P07 = 1) or up to two additional start-up
attempts (P07 = 2, 3) are performed depending on pa-
rameter 07.
Parameter 07 = 1: 1 start-up attempt.
t
SA1
t
Z
04
t
00
02
5
13
V1
1
14
V2
2
ϑ
1
ϑ
2
8
4
88
1
46
11
9
41
42
L1
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 subse-
quent fault lock-out. The fault message
04
will flash in
the BCU display depending on the burner operating
mode.
Parameter 07 = 2, 3: two or three start-up attempts.
t
SA1
t
Z
t
SA1
t
Z
t
00 02
5
13
V1
1
14
V2
2
ϑ
1
ϑ
2
8
4
88
1
46
11
9
41
42
L1
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,
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
SA1
elapses without a flame signal
having been detected, even after the last parameter-
ized start-up attempt, this will result in a BCU safety
shut-down with subsequent fault lock-out. The fault
message
04
will flash in the BCU display depending on
the burner operating mode.