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Glossary
19 Glossary
19 .1 Waiting time t
In standby, the waiting time t
background. During the waiting time (display H0), a self-
test is conducted to detect errors in internal and exter-
nal circuit components. If no malfunction is detected,
the BCU can start the burner.
19 .2 Ignition time t
If no malfunction is detected during the waiting time t
the ignition time t
then starts to elapse. Voltage is sup-
Z
plied to gas valves V1 and V2 as well as to the ignition
transformer. The burner is ignited. The duration of the
ignition time is either 1, 2, 3 or 6 s (depending on safety
time t
selected).
SA1
19 .3 Safety interlocks
The limiters in the safety interlock (linking of all the rel-
evant safety control and switching equipment for the
use of the application, e.g. safety temperature limiter,
minimum/maximum gas pressure) must isolate input
from the voltage supply.
19 .4 Safety time on start-up t
This refers to the period of time between switching on
and switching off of the gas valve, when no flame signal
is detected. The safety time on start-up t
BCU 580 · Edition 11.15l
W
starts to elapse in the
W
Z
SA1
(2, 3, 5 or
SA1
10 s) is the minimum operating time of the burner and
burner control unit.
19 .5 Safety time during operation t
08
08
,
W
t
If the flame fails during operation, the output for valve
V2 is disconnected within the safety time t
The default safety time during operation t
ance with EN 298 is 1 second. In accordance with
EN 746-2, the safety time of the installation during
operation (including closing time of the valves) may not
exceed 3 seconds. Note the requirements of the stand-
ards!
SB
SB
88
11
L1
46
1
ϑ1
9
13
V1
5
1
42
1
4
ϑ2
14
V2
8
2
43
2
17-18
41
t
.
SB
in accord-
SB
127
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