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Siemens Switzerland Ltd
User manual RVS61.843 CE1U2355en_02
HVAC Products 6 The settings in detail 23. November 2007
6.15 Buffer storage tank
Summary
2358A35
B4
B41
B42
A buffer storage tank can be integrated in the plant. It can be
charged via the heat pump, by solar energy or by an electric
immersion heater. In the case of active cooling, it can also be
used for storing cooling energy.
The controller controls heating / cooling and forced charging
of the buffer storage tank, protects it against
overtemperatures and maintains stratification whenever
possible.
Forced charging
Line no. Operating line
4708 Forced charging setp cooling
4709 Forced charg setp heat min
4710 Forced charg setp heat max
4711 Forced charging time
4712 Forced charg duration max
To save electricity costs or to fully charge the storage tank before the heat pump is
locked, forced charging of the buffer storage tank can be triggered. This way, operation
of the heat pump is maintained until the required temperature setpoint for forced
charging (heating / cooling) in the buffer storage tank is reached, or until forced
charging is no longer released, or until the heat pump must be switched off.
When the plant is operating in cooling mode, “Forced charging setp cooling” is used. In
heating mode, the slave point is used for the setpoint. It can be limited with ”Forced
charg setp heat min” (4709) and “Forced charg setp heat max” (4710).
Forced charging can be triggered either via low-tariff input E5 or operating line “Forced
charging time” (4711).
If forced charging is stopped because the heat pump had to be switched off, it will be
resumed as soon as the buffer storage tank temperature has dropped by 5 °C (heating)
or risen by 5 °C (cooling). At this point in time, forced charging must still be released,
and the number of permissible charging abortions must not be exceeded (2893).
Otherwise, the controller waits until forced charging is regularly triggered the next time.
In summer operation, or when all heating circuits are in protective mode, forced
charging is locked.
Forced charging of the buffer storage tank is completed when the “Forced charging
setp cooling“ (4708) is reached. When using setting “---“, forced charging cooling is
deactivated. For forced charging to start, the storage tank temperature at the bottom
must lie at least 2 K above the adjusted setpoint. If there is no sensor at the bottom, the
storage tank sensor at the top is used.
Forced charging setp
cooling
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