Honeywell BCU 465 - BCU 465 Program Sequence

BCU 460, BCU 465 · Edition 11.19 31
Function
3.4 BCU 465 program sequence
Switch on BCU 465
▼
In the event of fault signal: reset
▼
00
Safety interlocks
Start-up position/Standby
▼
A0
The air actuator can be opened for cooling
▼
00
Flame simulation check
(if parameter A003 = 0)
▼
01
Start-up with ϑ signal
▼
Wait until the pause time has elapsed (air actuator in ignition position)
(A062)
If A016 = 1:
verification of air “no flow” state check
▼
A1
P0
Pre-ventilation time after safety shut-down running (A036)
or
pre-purge running
▼
01
Min. pause time running again (parameterA062)
▼
Flame simulation check
(if parameter A003 = 1)
▼
A1
Pre-ventilation time t
VL
running (A036)
▼
A2
Safety time 1 t
SA1
running (A094),
ignition in process,
valves for 1
st
gas stage open and
min. operating time starts to elapse (A061)
▼
If parameter A048 = 1:
air valve opens with 1
st
gas stage
If no flame detected:
max. 3 start-up attempts (A007)
or fault lock-out
▼
A3
Flame proving period 1 t
FS1
running(A095)
▼
In the event of flame failure:
fault lock-out
▼
A4
Operation signalling contact closes,
valve for 2
nd
gas stage opens and
min. operating time t
B
starts to elapse(A061)
▼
In the event of flame failure:
restart or fault lock-out
▼