PFU 780 · Edition 02.12
31
4 .5 .2 Flame proving period t
FS
Pilot burner
Parameter 23
t
SA1
t
Z
04
02
03
00
t
t
FS
26a
16c
18e
2c–4c
88
10e
26e
30a
28c
2e–4e
V1
1
V2
ϑ
1
1
Main burner
Parameter 25
t
SA1
t
Z
04
06
07
08
02
03
00
t
t
FS1
t
SA2
t
FS2
26a
16c
18e
2c–4c
18a
14a
88
10e
26e
30a
28c
2e–4e
6a–6e
V1
1
V2
2
ϑ
1
ϑ
2
2
1
Programmable time between 0 and 25 s.
This time elapses before the PFU starts the next program step
so as to give the flame time to stabilise.
4 .5 .3 Minimum combustion time t
B
Parameter 20
Programmable time to maximum 25 s during which the main
burner remains in operation. In the case of brief activation of
the start-up signal input (
ϑ
2) (e.g. with a pulse), the combustion
time t
B
is started, and the main burner remains in operation
for at least this period.
04
06
07
t
t
B
26a
16c
18e
2c–4c
18a
14a
88
10e
26e
30a
2e–4e
6a–6e
V1
1
V2
2
ϑ
1
ϑ
2
2
1
Parameters > Behaviour during start-up