BCU 460, BCU 465 · Edition 11.19
78
Parameters
11 .5 Behaviour during start-up
11 .5 .1 Burner 1 start-up attempts
Parameter A007
This parameter defines the maximum number of pos-
sible start-up attempts of the burner.
Taking into account national standards and require-
ments, it must be clarified whether multiple start-up
attempts are permitted .
In accordance with EN 746-2, a restart may be con-
ducted only if the safety of the installation is not im-
paired.
Multiple start-up attempts are not permitted under
NFPA 86. If no flame forms during start-up, this must
result in a fault lock-out.
If no flame is detected during start-up, an immediate
fault lock-out (A007 = 1) or up to two additional start-
up attempts (A007 = 2, 3) are performed depending on
parameter A007.
Parameter A007 = 1: 1 start-up attempt.
t
SA1
t
Z
02
00
t
E 04
8888
ϑ
L1
V1
V2
V3
1
35
L
51
22
60
61
62
96
82
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
E 04
will flash
in the BCU display depending on the burner operating
mode.
Parameter A007 = 2, 3:
2 or 3 start-up attempts.
t
SA1
t
Z
02
00
t
01 02
t
SA1
t
Z
88
ϑ
L1
V1
V2
V3
t
W
E 04
1
35
L
51
22
60
61
62
96
82
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 parameterized
start-up attempt, this will result in a BCU safety shut-
down with subsequent fault lock-out. The fault mes-
sage
E 04
will flash in the BCU display depending on the
burner operating mode.