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

PFU 780 · Edition 02.12l 32
Parameters
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
ϑ1
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
ϑ1
ϑ2
2
1
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.
4.5.3 Minimum combustion time t
B
Parameter 20
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
ϑ1
ϑ2
2
1
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
B
is started, and the main
burner remains in operation for at least this period.