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Siemens Switzerland Ltd User manual RVS61.843 CE1U2355en_02
HVAC Products 6 The settings in detail 23. November 2007
Overtemp prot pump circuit
Line no. Operating line
HC1 HC2 HCP
820 1120 1420 Overtemp prot pump circuit
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 source
temperature. As a result of this too high flow temperature, the pump heating circuit
would assume excessive temperatures.
Function "Overtemperature protection for pump circuits" ensures that the energy supply
for pump heating circuits corresponds to the demand from the heating curve by
activating / deactivating the pump.
Important:
The function may only be activated in plants with buffer or combi storage tanks. In the
case of plants without storage tank, there is a risk of a compressor being in operation
without having a consumer pump running.
Mixing valve control
Line no. Operating line
HC1 HC2
830 1130 Mixing valve boost
832 1132 Actuator type
2-position ¦ 3-position
833 1133 Switching differential 2-pos
834 1134 Actuator running time
The controller adds the mixing valve boost set here to the current flow temperature
setpoint and uses the value as the temperature setpoint for heat generation.
2-position
The controller drives the actuator with only one relay output. When the output delivers a
signal, the valve opens. When there is no signal, the valve closes automatically.
3-position
The controller drives the actuator with 2 relay outputs. One of the outputs is used for
opening the valve and one for closing the valve.
For the 2-position actuator, the "2-position switching differential" must also be adapted.
The switching differential has no impact on 3-position operation.
For 3-position operation, the running time of the mixing valve actuator can be adjusted.
The actuator running time has no impact on 2-position operation.
Mixing valve boost
ctuator type
Switching differential 2-
pos
ctuator running time
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