Siemens AVS75.39 Series User Manual page 134

Charging control
Flow setpoint boost
Transfer boost
Type of charging
Switching diff
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Siemens
Building Technologies
Line no. Operating line
5020 Flow setpoint boost
5021 Transfer boost
5022 Type of charging
Recharging ¦ Full charging ¦ Full charging legio ¦ Full charg 1st time day ¦ Full
charg 1st time legio
5024 Switching diff
The DHW request to the boiler is made up of the current DHW setpoint plus the
adjustable charging boost.
Heat transfer makes it possible to transport energy from the buffer storage tank to
the DHW storage tank. For that, the current buffer storage tank temperature must
exceed the current DHW storage tank temperature by the amount of the transfer
boost.
The temperature differential can be set here.
DHW charging can be effected with 1 or 2 sensors.
If only 1 sensor is configured (installed), selection "Recharging" applies.
Recharging
The DHW storage tank is charged until the sensor at the top (B3) reaches its
setpoint. The sensor at the bottom (B31) is not taken into consideration.
Full charging
The DHW storage tank is fully charged. Storage tank sensors B3 and B31 must
reach their setpoints.
Full charging legio
The storage tank is charged with sensor B3 only.
For the "Legionella" function, both sensors (B3 and B31) must reach their
setpoints.
Full charg 1st time day
The first DHW storage tank charging in the morning means full charging with
sensors B3 and B31. Further chargings and the "Legionella" function are
performed with B3 only.
Full charg 1st time legio
The first DHW storage tank charging in the morning and the "Legionella" function
mean full charging with sensors B3 and B31. Further chargings are effected with
B3.
If the DHW temperature is lower than the current setpoint minus the switching
differential set here, DHW charging is started.
DHW charging will be terminated when the temperature reaches the current
setpoint.
The first DHW charging is also started when the DHW temperature lies within the
switching differential, provided it does not lie less than K below the setpoint.
User manual RVS43.345
The settings in detail
CE1U2354en_021
2013-09-02