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4.3.14 Setting Maximum Clear Flushing Time
Clear flushing is mainly used for drinking water disinfection where maximum clear flushing times
of more than 10 hours are often implemented. The shut-off valve will close and the flushing valve
open if, for example, the UV transmission in ground water or spring water deteriorates after heavy
rainfall to such an extent that the UV-C sensor signal drops below the safety threshold. Normal
operation of the UV system will be restored as soon as the water quality has improved. The
UV system will switch to flow mode if the UV-C sensor signal does not rise above the safety
threshold again within the maximum clear flushing time.
Presetting 1 min
4.3.15 Setting Lamp Afterglow
In large UV systems for drinking water disinfection it is possible that a longer period of time may
elapse until the shut-off valve closes or the water flow is otherwise interrupted. In this case, the
lamp afterglow function prevents water that has not been properly disinfected from reaching the
consumer while the UV system is switched off.
A lamp afterglow period of 1 minute is sufficient in the majority of cases.
Presetting OFF
4.3.16 Setting Standstill and Intermittent Flushing Time
Standstill flushing is used particularly for the own supply of drinking water. Long periods of time
without tapping off water can be assumed in connection with UV systems in self-supply
applications. In such cases, standstill flushing is recommended in order to avoid impermissible
overheating and radiation of the water.
If a flow control instrument whose contact closes on exceeding a minimum flow rate is
connected to the FLOW switched input of the control, the flushing valve will be opened for the
intermittent flushing period if no water is tapped off within the maximum standstill period.
If no flow control instrument is connected to the FLOW switched input of the control, i.e. the
input is open, the flushing valve will open for the set intermittent flushing time after the maximum
standstill period (periodic flushing).
A maximum standstill flushing period of 5 hours is set in most cases. An intermittent flushing time
of 1 minute is normally sufficient.
No intermittent flushing occurs if the maximum standstill period is set to 00:00.
Presetting 00:00 h:min (maximum standstill period)
1 min (intermittent flushing time)
Intermittent
flushing time
1 min
Maximum
standstill time
00:00 h:min
Control
Maximum clear
flushing time
00:01 h:min
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