Siemens AVS75.39 Series User Manual page 144

Full charge
Limitations
Min start temp diff Q33
Startup delay Q33
Mixing pump Q35
Legionella funct mixing
pump
144 / 239
Siemens
Building Technologies
Line no. Operating line
5146 Full charging with B36
No ¦ Yes
To fully charge the DHW storage tank, DHW charging sensor B36 can be used in
place of sensor B31.
The charging process is completed when sensor B36 reaches the required
temperature (DHW setpoint plus line 5140 plus 3 K) and, at the same time, sensor
B3 reaches the required setpoint.
When starting DHW storage tank charging, the intermediate circuit sensor is
considered only if the intermediate circuit pump has been in operation for at least
30 seconds.
Line no. Operating line
5148 Min start temp diff Q33
5149 Startup delay Q33
The intermediate circuit pump Q33 is only started up when the temperature in the
primary circuit (B2, B22, B10, B15, and B25) is above the upper DHW storage tank
temperature (B3) by the temperature difference entered here. This maintain
temperature stratification in the storage tank.
Start up of pump Q33 is delayed compared to the start up by pump Q3 by the set
time. During this period, the primary circuit for DHW charging is heated up.
After the delay expires, pump Q33 switches on if the condition for minimum start-up
temperature is also met.
The functions stratification and restratification is enabled is the mixing pump is
configured.
Line no. Operating line
5160 Legionella funct mixing pump
Off ¦ With charging ¦ With charging and duration
5165 Restratification
No ¦ Yes
5166 Restrat temp min
5167 Restrat temp diff min
Off
The "Off" setting does not use the mixing pump when the legionella function is
active.
During charging
The mixing pump Q35 operate during an active legionella function.
During charging and dwelling period
Mixing pump Q35 is operated during active legionella function and during the
following linger period (line 1646). .
User manual RVS43.345
The settings in detail
CE1U2354en_021
2013-09-02