Minimum Burner Pause Time T Bp - Honeywell Krom Schroder PFU 780 Technical Information

Parameters
4 .4 .2 Minimum burner pause time t
Parameter 21
Programmable time between 0 and 250 s.
08 04 05 06
t
BP
An immediate restart of the main burner after a nor-
mal shut-down, a start-up attempt, restart, cooling
or purging is prevented by the pause time. The pause
time starts when the air valve is switched off. If a start-
up signal (ϑ2) is applied before expiry of this time, the
start-up is delayed until the end of the pause time.
After the pause time, the burner is started if the start-
up signal (ϑ) is applied.
The minimum burner pause time t
program sequence to the requirements of the applica-
tion.
PFU 780 · Edition 02.12l
BP
07 08 88
1
5
4
1
7
9
1
12
V1
16-17
1
21
2
9
2
14
V2
28-29
2
18-19
t
t
FS2
t
SA2
serves to adapt the
BP
The time should be set such that the system can be
moved to ignition position, i.e. butterfly valves can be
closed and, possibly, gas can be flared off, before a re-
start occurs.
See examples of application Stage-controlled main
burner with alternating pilot burner and Stage-con-
trolled main burner with permanent pilot burner.
The pause time has an effect on the behaviour of the
main burner only. Background: The pilot burner is only
used in single-stage operation.
30