Siemens AVS75.39 Series User Manual page 141

Transfer of heat
Transfer strategy
Heat transfer with
combi storage tank
Siemens
Building Technologies
Line no. Operating line
5130 Transfer strategy
Off ¦ Always ¦ DHW release
5131 Comparison temp transfer
With B3 ¦ With B31 ¦ With B3 and B31
Q11
B3/B31
The following transfer strategies are available:
Off
No transfer takes place with the "Off" setting.
Always
The DHW storage tank is always transferred to nominal setpoint when the DHW
operating mode is switched on. If the "Legionella" function is activated and due, the
heat is transferred until the legionella setpoint is reached.
DHW release
The DHW storage tank is always transferred to the present setpoint per the DHW
release times (OL1620) when the DHW operating mode is switched on. If the
"Legionella" function is activated and due, the heat is transferred until the legionella
setpoint is reached.
The function "With buffer storage tank" (line 5090) is activated (setting "Yes") for
charging with Q3 from the buffer storage tank.
If Q3 was parameterized as a diverting valve (line 5731), or a specific transfer
pump Q11 is installed, Q3 is not used for the transfer of heat.
In the case of a manual DHW push during heat transfer, normal DHW charging to
the nominal DHW setpoint is triggered.
If the buffer storage tank fulfills this temperature demand as well (buffer storage
temperature > DHW nominal setpoint + charging increase), the transfer remains
active and the heat source is not started up.
If a specific transfer pump Q11 is installed, the transfer of heat is also effected
when using a combi storage tank.
If only Q3 is used and heat transfer is in progress, the controller waits until the
DHW section is heated up again by the surrounding storage tank; during this period
of time, neither the generator nor Q3 is put into operation.
If this waiting time is not desired, the "Transfer" function must be deactivated.
User manual RVS43.345
The settings in detail
If the temperature level of the buffer storage tank is
high enough, the DHW storage tank can be
charged by the buffer storage tank. Depending on
the hydraulic circuit, the transfer of heat can be
effected either with charging pump Q3 or transfer
B4
pump Q11, which is specifically parameterized for
this function.
When DHW heating is deactivated, the transfer of
heat is switched off as well.
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CE1U2354en_021
2013-09-02