Bcu 465 Program Sequence - Honeywell BCU 460 Technical Information

Function
00
A0
00
01
A1
01
BCU 460, BCU 465 · Edition 03.16l
A1
Switch on BCU 465
In the event of fault signal: reset
Safety interlock (Limits)
Start-up position/Standby
The air valve can be
opened for cooling.
If parameter P15 = 1:
flame simulation check
Start-up with ϑ signal
Wait until min. burner pause time
t has elapsed (P21)
BP
If parameter P06 = 1: verification of air
"no flow" state check
Pre-ventilation time after
safety shut-down running (P39–41)
Min. burner pause time t
running once again (P21)
If parameter P15 = 0:
flame simulation check
Pre-ventilation time t running (P37)
VL
BP

3 .5 BCU 465 program sequence

Normal start-up
If an "old" fault is still being sig-
nalled after switching on, it will be
necessary to reset this first.
When the safety interlocks are
closed, the BCU reverts to start-up
position and conducts a self-test. If
it does not determine a malfunction
of the internal electronic circuitry or
of the flame sensor, the burner can
be started.
The flame simulation check is con-
ducted during start-up position or
after applying the start-up signal
(ϑ), depending on parameter 15.
After a safety shut-down, first the
pre-ventilation time after safety
shut-down elapses (parameters 39
– 41). Then the min. burner pause
time t runs. The BCU now opens
BP
valve V1 and ignites the burner. The
ignition time t is constant.
Z
▼
36