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Caution!
However, this setting operation should only be used if the alignment of the flame
sensor, as well as sensitivity and frequency settings as to reliability have fully been
used.
7.1.4 Checking the flame shut-down on fault
Simulate a flame rupture or flame extinction. To this end, shut off the fuel supply to the
burner to be monitored by the flame detector. Check that the signal for shutting-off the
safety valve is triggered off within the period of T
S
< 1 s (on safety period “Operation“ at
t
VOff
= 1 s) after extinction of the flame.
LED „red“ lights
LED „green“ dark
For the IR compact flame detectors of the F 200 K1(2) IR-1 and/or F 200 K1(2) IR -2
types, take into account the special reflection effects caused by the combustion
chamber. Consequently, switch-off tests have to be carried out when the boiler has
the operating temperature. In particular, make sure that the sensitivity of the compact
flame detector is increased only to such a value required to safely and reliably monitor
the flame throughout the operating range of the burner.
7.1.5 Fault on flame detection
Check this function according to section 7.1.2.
1. Interference
Generally, interference becomes apparent by the fact that the intensity indicator of the
device may indicate 100 %, but the green LED (“Flame in“) doesn't light up. Or, the
green LED lights up for a moment, but then it doesn't change its intensity according to
the cycle rhythm and goes out again. This is a cycle synchronisation fault (signal in
both evaluation channel present at the same time). This may chiefly be due to the in-
terference emission of the ignition transformer during ignition.
- Check the shielding and FPE for proper connection to the F 200 K
- Carry out a proper grounding of the ignition transformer
- Check the cables for laying and if required untangle / separate them spa-
tially
2. Excessive temperatures
Make sure that the maximum admissible ambient temperature of 60 °C is not ex-
ceeded at the installation site. In case temperatures are expected to be higher, take
appropriate cooling measures (e.g. cooling air enclosure FS 50 or FS 51, section
14.3). Moreover, make sure that the flame detector casing doesn't heat up beyond this
temperature value due to the impact of the heat radiated by the boiler. Overheating
will result in a sensitivity loss in the first line, or will cause damage to the sensor ele-
ments and with it may result in a total failure of the system.
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