BCU 460, BCU 465 · Edition 11.19
99
Parameters
03
02
04
2
1
t
t
FS1
t
SA1
t
VLM
PZL
HT
ϑ
51
61
65
60
6
1
7
36
42
FLO
In Flameless mode, the burner is started with the pre-
ventilation time t
VLM
defined in parameter A028. No
ignition using the transformer takes place during the
safety time t
SA
. The gas valves V1 and V2 are opened at
the start of the safety time t
SA
.
The air pressure switch is queried via terminal 36.
Parameter A074 = 2: High temperature operation with-
out ignition. If the BCU is in High temperature mode,
the ignition (ignition transformer) will not be activated
for the start-up.
11 .8 .13 Over-run time, flameless tNL
Parameter A139
00
A0
A4
t
t
NL
A
88
ϑ
V1
V2
V3
PZL
1
1
35
L
51
22
60
61
62
96
82
36
65
4
In Flameless mode, the actuator (air valve, actuator) will
remain open for the programmed over-run time t
NL
(0
to 60 s) if the start-up signal (
ϑ
) drops out following a
controlled shut-down. The burner control unit closes
the actuator after the elapse of the over-run time t
NL
.