Overtemp Prot Pump Circuit; Mixing Valve Control - Siemens Albatros2 User Manual

Overtemp prot pump circuit

Mixing valve control

Mixing valve boost
Actuator type
Switching differential 2-
pos
Actuator running time
84/221
Siemens Switzerland Ltd
HVAC Products
Line no.
HC1 HC2 HCP
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 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.
Line no.
HC1 HC2
830 1130
832 1132
833 1133
834 1134
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.
User manual RVS61.843
6 The settings in detail
Operating line
Overtemp prot pump circuit
Operating line
Mixing valve boost
Actuator type
2-position ¦ 3-position
Switching differential 2-pos
Actuator running time
CE1U2355en_02
23. November 2007