Operating principle

The active mixing circuit controls the net thermal power passing through the circuit by mixing cold return water (coming from the end unit return pipes) with hot water from the primary production side. In full load operation the inlet gate of the 3-way mixing valve is completely opened whereas in partial load conditions the 3-way mixing valves is positioned in function of the process value (measured water temperature) and set point (heating curve). In case of long distances the primary bypass is used to reduce the waiting time for hot water to arrive at the 3-way mixing valve. 

Individual components and parameters

1. Secondary pump 
2. 3-way mixing valve
3. Balance valve for pump
4. Balance valve for primary balancing

System check 

As this mixing circuit has a primary bypass, This base circuit needs a primary pump to inject hot water to the secondary side. If the software encounters a missing pump on the primary side of the passive dividing circuit, it will report this as a problem while running the system check.