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Siemens Switzerland Ltd. User manual CE1U2354en
HVAC Products The settings in detail 11. May 2007
Legionella function
Line no. Operating line
1640 Legionella function
Off
Periodically
Fixed weekday
1641 Legionella funct periodically
1642 Legionella funct weekday
Monday…Sunday
1644 Legionella funct time
1645 Legionella funct setpoint
1646 Legionella funct duration
1647 Legionella funct circ pump
• Periodically
The legionella function is repeated according to the period of time set (operating line
1641). The legionella setpoint is attained via a solar plant, independent of the period of
time set, the period of time will be newly started.
• Fixed weekday
The legionella function can be activated on a fixed weekday (operating line 1642).
When using this setting, heating up to the legionella setpoint takes place on the
selected weekday, independent of previous storage tank temperatures.
During the time the legionella function is carried out, the DHW circulating pump can be
activated.
During the time the legionella function is carried out, there is a risk of scalding when
opening the taps.
Circulating pump
Line no. Operating line
1660 Circulating pump release
Time program 3/HCP
DHW release
Time program 4/DHW
Time program 5
1661 Circulating pump cycling
1663 Circulation setpoint
When the function is activated, the circulating pump is switched on for 10 minutes
within the release time and then switched off again for 20 minutes.
If a sensor is installed in the DHW distribution pipe, the controller will monitor its actual
value during the time the legionella function is performed. The adjusted setpoint must
be maintained at the sensor during the adjusted “Dwelling time“.
Legionella function
Legionella funct circ pump
Circulating pump cycling
Circulation setpoint
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