Function Block "Legionella Function; Operating Lines; Periodicity Of Legionella Function; Time Of Legionella Function - Siemens RVL481 Basic Documentation

Siemens
Building Technologies
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
147 Periodicity of the legionella function
148

Time of legionella function

149 Dwelling time at legionella setpoint
150

Circulating pump operation during the legionella function

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
Heating and D.h.w. Controller RVL481
23 Function block "Legionella function"
Factory setting (range) Unit
1 (0...7)
05:00 (00:00...24.00) hh:mm
30 (0...360)
1 (0 / 1)
79/118
CE1P2541en
20.05.2008
min