Application 12
EI.65.D4.02
89
6.3.13 Application 12
System diagram 12
Two heat circuits with common heat exchanger. One heat circuit has a mixing
valve.
Heat circuit 1 The motor valve M1 controls the flow temperature, which is measured by the sen-
sor S1. The return temperature measured by the sensor S2 can be limited. The cir-
culation pump P1 is running when the reference flow temperature is above 20 °C
or the outdoor temperature is below 2 °C.
Heat circuit 2 The mixing valve M2 controls the flow temperature in the mixing circuit, which is
measured by the sensor S4. The flow temperature measured at S4 in heat circuit 2
influences the temperature level at S1 in heat circuit 1. The return temperature
measured by the sensor S5 can be limited. The circulation pump P2 is running
when the reference flow temperature is above 20 °C or the outdoor temperature is
below 2 °C.
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