Honeywell BCU 465 - BCU 460 Program Sequence

BCU 460, BCU 465 · Edition 11.19 30
Function
3.3 BCU 460 program sequence
Switch on BCU 460
▼
In the event of fault signal: reset
▼
00
Safety interlocks
Start-up position/Standby
▼
H1
Flame simulation check
(if parameter A003 = 0)
▼
P0
External actuation of the air valve for purging
▼
A0
External actuation of the air valve for cooling
▼
01
Start-up with ϑ signal
▼
Wait until the min. pause has elapsed (parameterA062)
▼
Flame simulation check
(if parameter A003 = 1)
▼
02
Safety time 1 t
SA1
(A094) running,
ignition in process,
valves for 1
st
gas stage open and
min. operating time starts to elapse (A061)
▼
If no flame detected:
max. 3 start-up attempts (A007)
or fault lock-out
▼
03
Flame proving period 1 t
FS1
running(A095)
▼
In the event of flame failure:
fault lock-out
▼
04
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
▼
A4
External actuation of the air valve for capacity control
04
Controlled shut-down via ϑ signal
▼
00
If min. operating time t
B
has elapsed:
operation signalling contact opens,
gas valves close and
min. pause time starts to elapse (A062)