Siemens AVS75.39 Series User Manual page 83

Legionella funct circ
temp diff
Circulating pump
Release of circulating
pump
Circulating pump cycling
Circulation setpoint
Example 1
Example 2
Remote control
Siemens
Building Technologies
The circulating pump continues to operate until the temperature at circulation
sensor B39 achieves setpoint (line 1645) minus the circulation difference
(line 1648),
and the set duration of the function (line 1646) has elapsed.
The error message (Number: 127) is sent is the circulation pipe fails to achieve the
required level for 48 hour.
If the temperature differential is not set, the temperature at sensor B39 is not
monitored during the period of time the "Legionella" function is performed.
Line no. Operating line
1660 Circulating pump release
Time program 3/HC3 ¦ DHW release ¦ Time program 4/DHW ¦ Time program 5
1661 Circulating pump cycling
1663 Circulation setpoint
When using setting "Release DHW", the circulating pump runs when DHW heating
is released. The other settings as per the applicable time program.
When the function is activated, the circulating pump is switched on for a fixed time
of 10 minutes within the release time and then switched off again for 20 minutes.
The circulation pump Q4 switches on as soon as the set value is breach if sensor
B39 is located in the DHW distribution pipe. The pump then operates fixed for 10
minutes or more until the setpoint is once again achieved. A set difference of 8 K
always exists between the setpoint for the DHW storage tank and the setpoint for
sensor B39 (Par 1663). This ensures that the circulation setpoint can be achieved
again and keeps the circulation pump from running continuously.
DHW setpoint: 55°C (nominal setpoint).
Circulation setpoint: 45°C
The circulating pump is activated when the temperature at the sensor drops
below 45 °C and then runs for at least 10 minutes.
DHW setpoint: 50°C
Circulation setpoint: 45°C
The circulating pump is activated when the temperature at the sensor drops
below 42 °C (50 °C – 8 K) and then runs for at least 10 minutes.
Line no. Operating line
1680 Optg mode changeover
None ¦ Off ¦ On ¦ Eco
In the case of external changeover via the Hx inputs, the operating mode for DHW
heating to be used after changeover can be selected.
User manual RVS43.345
The settings in detail
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CE1U2354en_021
2013-09-02