Legend - Honeywell Krom Schroder PFU 780 Technical Information

Legend

11 Legend
88
Display
88
Blinking display
Ready
Safety interlocks (Limits)
1 Start-up signal, pilot burner
2
Start-up signal, main burner
Digital input
DI
Ignition transformer
Gas valve
Air valve
Purge
P
Ext. air valve control
A
Flame signal
Operating signal, pilot burner
1
Operating signal, main burner
2
Fault signal
Reset
Input signal
Output signal
Flame simulation check
Waiting time ≥ 2 s
t
W
t Safety time on start-up 3 s, 5 s or 10 s
SA
t Safety time during operation < 1 s or < 2 s
SB
t Ignition time 2 s, 3 s or 6 s
Z
t Flame simulation delay time 25 s
LV
t Flame proving period 0 – 25 s
FS
t Minimum combustion time t
B
t Minimum burner pause time 0 – 250 s
BP
t Low fire over run time 0 s, 5 s, 15 s or 25 s
KN
Input/Output safety circuit
PFU 780 · Edition 02.12l
up to max. 25 s
SA
67