Honeywell BCU 460 Technical Information page 37

Function
A1
A2
min. burner on time t
If no flame detected or air flow decreases:
A3
In the event of flame failure or air flow failure:
A4
In the event of flame failure or air flow failure:
BCU 460, BCU 465 · Edition 03.16l
If parameter P15 = 0:
flame simulation check
Pre-ventilation time t running (P37)
VL
Safety time t running (P22),
SA
ignition in process,
V1 opens and
starts to elapse (P20)
B
If parameter P30 = 1:
air valve opens with V1
max. 3 start-up attempts
or fault lock-out
Flame proving period t
running (P23)
fault lock-out
Operation signalling contact closes and
V2 opens
restart
or fault lock-out
FS
If both flame and air flow are de-
tected during the safety time t
the flame proving period t
after this safety time has elapsed.
Valve V2 opens and the opera-
tion signalling contact between
terminals 16 and 17 closes. This
completes start-up. An adjustable
min. burner on time t
B
the burner burns for a defined pe-
riod even if the start-up signal (ϑ) is
switched off beforehand.
The burner can also be started
manually with the aid of the switch
on the BCU. Voltage must be ap-
plied continuously to terminals 1, 4
and 5 in order for this to occur.
The BCU can also be operated in
Manual mode for start-up.
▼
,
SA
starts
FS
ensures that
37