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Glossary
11 .5 Safety time during operation t
04
04
t
SB
If the flame fails during operation, the valve outputs are
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 s. Note the requirements of the Standards!
11 .6 Flame signal
If a flame is detected, the flame detector will supply a
flame signal.
11 . 7 Fault lock-out
In the event of a fault lock-out, the valve and the igni-
tion transformer are disconnected from the electrical
power supply, and a fault is signalled. Resetting must
take place manually following a fault lock-out.
BCU 440 · Edition 01.17
11 .8 Safety interlocks (Limits)
SB
The limiters in the safety interlock (linking of all the rel-
evant safety control and switching equipment for the
88
use of the application, e.g. safety temperature limiter,
1
ϑ
7
minimum/maximum gas pressure) must isolate input
9
12
16-17
18-19
11 .9 Gas valve V1
t
The start fuel flow rate for the burner is released by
gas valve V1. It opens when the safety time on start-up
.
t
SB
switched off again by a controlled shut-down or fault
in accord-
SB
lock-out.
11 .10 Continuous operation
The gas burner runs continuously for more than
24 hours.
from the voltage supply.
starts to elapse. It remains open until the burner is
SA
35
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