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Siemens Heating and D.h.w. Controller RVL481 CE1P2541en
Building Technologies 23 Function block "Legionella function" 20.05.2008
23 Function block "Legionella function"
In the case of d.h.w. heating systems with storage tanks, this function prevents the
formation of legionella bacteria. This is accomplished by periodically heating the d.h.w.
to a certain temperature level.
23.1 Operating lines
Line Function, parameter Factory setting (range) Unit
147 Periodicity of the legionella function 1 (0…7)
148 Time of legionella function 05:00 (00:00…24.00) hh:mm
149 Dwelling time at legionella setpoint 30 (0…360) min
150 Circulating pump operation during the legionella function 1 (0 / 1)
23.1.1 Periodicity of legionella function
The periodicity is displayed on operating line 147.
• Setting 0 ensures that d.h.w. heating to the legionella setpoint takes place once a day
• Settings 1 through 7 ensure that d.h.w. heating to the legionella setpoint takes
place once a week. Setting 1 means every week on Monday, setting 2 every week
on Tuesday, etc.
23.1.2 Time of legionella function
The time of day the legionella function shall be activated can be set on operating
line 48.
23.1.3 Dwelling time at the legionella setpoint
Operating line 149 is used to determine for what period of time the actual d.h.w. tem-
perature must lie above the legionella setpoint (operating line 130) to satisfy the re-
quirement of this function.
23.1.4 Circulating pump operation during the legionella
function
Operating line 150 can be used to select whether the legionella function shall act on the
d.h.w. circulating pump.
• When choosing “0”, the legionella function does not act on the d.h.w. circulating pump
• When choosing “1”, the legionella function acts on the d.h.w. circulating pump
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