BCU 480 · Edition 03.16l
42
Parameters
4 .5 .4 Burner start-up attempts
Pilot burner
Parameter 10
This indicates the number of possible start-up attempts
of the 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 or if the air flow on the BCU fails
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 at-
tempts must be specified when ordering.
1 start-up attempt
Parameter 10 = 1
t
SA
t
Z
88
02
00
t
4
5
1
7
9
18-19
12
V1
14
V2
16-17
02
ϑ
1
If no flame forms during start-up, a fault lock-out is
performed after expiry of time t
SA
. The display blinks
and shows the cause of the fault.
2 or 3 start-up attempts
Parameter 10 = 2, 3
ϑ
1
t
SA
t
Z
88
02
00
t
4
5
1
7
9
18-19
12
V1
14
V2
16-17
01 02
t
SA
t
Z
t
W
If several start-up attempts are set at the works and if
the BCU detects a flame failure during start-up, it clos-
es valve V1 after the safety time t
SA1
has expired and
attempts to start up again. After the last programmed
start-up attempt has been completed, the burner con-
trol unit conducts a fault lock-out. The display blinks
and shows the cause of the fault.
▼