Behaviour During Start-Up; Safety Time On Start-Up T; Minimum Burner On Time T; Flame Proving Period T - Honeywell BCU 460 Technical Information

Parameters

4 .4 Behaviour during start-up

4 .4 .1 Safety time on start-up t

Parameter 22
00 02
t
Z
t
SA
This indicates the safety time on start-up t
burner.

4 .4 .2 Minimum burner on time t

Parameter 20
Programmable time in the range from minimum safety
time on start-up t to maximum 25 s during which the
SA
burner remains in operation.
In the case of brief activation of the start-up signal in-
put (ϑ) (e.g. with a pulse), the burner on time t
ed, and the burner remains in operation for at least this
period. This time is independent of the pre-ventilation
time.
BCU 460, BCU 465 · Edition 03.16l
SA
03 04 88
1
5
4
ϑ
7
9
12
V1
14
V2
16-17
18-19
t
t
FS
for the
SA
B
is start-
B

4 .4 .3 Flame proving period t

Parameter 23
00 02
t
Z
t
SA
Programmable time between 0 and 25 s.
This time elapses before the BCU starts the next pro-
gram step so as to give the flame time to stabilize.

4 .4 .4 Burner start-up attempts

Parameter 10
This indicates the number of possible start-up attempts
of the burner.
In accordance with EN 746-2, a maximum of three start-ups
are permitted in specific cases if the safety of the installation
is not impaired. Note the requirements of the Standards!
If no flame is detected or, in the case of BCU 465, if the
air flow fails during start-up, either a fault lock-out oc-
curs 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.
▼
FS
03 04 88
1
5
4
ϑ
7
9
12
V1
14
V2
16-17
18-19
t
t
FS
50