Honeywell Krom Schroder BCU 580 - 3.2 BCU 580 program sequence

BCU 580 · Edition 11.15l 23
Function
3.2 BCU 580 program sequence
Parameters 48 and 49 = 0: High/Low control during op-
eration, cooling in standby
Example of application, see page 11 (Two-stage-
controlled main burner with permanent pilot burner)
Switch on BCU 580
▼
In the event of fault signal: reset
▼
00
Safety interlocks
Start-up position/standby
▼
Flame simulation check
▼
PO
External actuation of the air valve for purging
▼
A0
External actuation of the air valve for cooling
▼
H1
Pilot burner start-up with ϑ1 signal
▼
Wait until the running time has elapsed (P42)
▼
02
Safety time 1 t
SA1
running,
ignition in process,
valves V1 and V4 open
▼
If no flame detected:
max. 3 start-up attempts
or fault lock-out
▼
03
Flame proving period 1 t
FS1
running (P95)
▼
In the event of flame failure:
fault lock-out
▼
04
Pilot burner operation signalling contact closes
▼
In the event of flame failure:
restart or fault lock-out
▼
05
Main burner start-up with ϑ2 signal
▼
Wait until the running time has elapsed (P42)
▼
06
Safety time 2 t
SA2
running,
valves for 1
st
gas stage (main burner) open.
▼
If no flame detected:
max. 3 start-up attempts
or fault lock-out
▼
07
Flame proving period 2 t
FS2
running (P97)
▼
In the event of flame failure: fault lock-out
▼