BCU 460, BCU 465 · Edition 11.19 96
Parameters
11.8.10 Pre-ventilation/flameless
Parameter A028
This parameter is used to define the time during which
the air valve is open in Flameless mode before the nor-
mal start-up. Suitable for burners starting with full air
capacity.
Adjustable from 0 to 250s.
t
t
Z
A2 A300
t
t
VLM
A1 A4
1
t
FS1
A
88
ϑ
V1
V2
V3
PZL
1
35
L
51
22
60
61
62
96
82
36
65
4
7
6
HT
FLO
After the start-up signal (ϑ) has been applied and the
“no flow” state check has been conducted successfully,
the air valve is opened. Start-up of the burner com-
mences with no interruption of the air supply after ex-
piry of the programmable pre-ventilation timet
VLM
.
Parameter setting for this example sequence:
A074 = 1; A016 = 0, see also page87 (Delayed low air
pressure protection). The gas valve does not open until
the pressure switch has switched.
If the pre-ventilation time in Flameless mode (A028) >
the running time (A042) and there is no signal from the
pressure switch at terminal36 after the elapse of the
running time (A042), the BCU performs a shut-down.
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