Siemens AVS75.39 Series User Manual page 63

Frost protection
HC pump
Overtemperature
protection pump
heating circuit
Siemens
Building Technologies
Line no.
HC1 HC2 HC3
810 1110 1410
Under the setting "On", the corresponding HC pump is operated for active plant
frost protection. (see description of plant frost protection)
Line no.
HC1 HC2 HC3
820 1120 1420
In the case of heating plants with pump heating circuits, the flow temperature of the
heating circuit can be higher than the flow temperature called for by the heating
curve, the reason being higher requests from other heat consumers (mixing
heating circuit, DHW charging, external heat demand), or a parameterized
minimum heat pump temperature. As a result of this too high flow temperature, the
pump heating circuit would assume excessive temperatures.
Function "Overtemperature protection for pump heating circuits" ensures that the
energy supply for pump heating circuits corresponds to the demand from the
heating curve by activating / deactivating the pump.
User manual RVS43.345
The settings in detail
Operating line
Frost prot plant HC pump
Off ¦ On
Operating line
Overtemp prot pump circuit
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CE1U2354en_021
2013-09-02