Flame Proving Period T; Minimum Combustion Time T - Honeywell Krom Schroder PFU 780 Technical Information

Parameters

4 .5 .2 Flame proving period t

Pilot burner
Parameter 23
00 02
t
Z
t
SA1
Main burner
Parameter 25
00 02 03 04
t t
Z FS1
t
SA1
Programmable time between 0 and 25 s.
This time elapses before the PFU starts the next pro-
gram step so as to give the flame time to stabilise.
PFU 780 · Edition 02.12l
FS
88
03 04
30a
26e
10e
1
28c
26a
1
16c
V1
18e
V2
2c–4c
1
2e–4e
t
t
FS
88
06 07 08
30a
26e
10e
28c
16c
26a
2c–4c
14a
18e
18a
6a–6e
2e–4e
t t
SA2 FS2

4 .5 .3 Minimum combustion time t

Parameter 20
04
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 (ϑ2) (e.g. with a
pulse), the combustion time t
burner remains in operation for at least this period.
1
V1
1
1
2
V2
2
2
t
B
06 07 88
30a
26e
10e
16c
26a
2c–4c
14a
18e
18a
6a–6e
2e–4e
t
B
is started, and the main
B
1
V1
1
1
2
V2
2
2
t
32