Application 3
EI.65.D4.02
49
6.3.4 Application 3
System diagram 3A
Common primary heat exchanger for a heat circuit and a hot-water circuit with
indirect control of storage tank.
Heat circuit 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 when the outdoor temperature is below 2 °C.
Hot-water circuit The hot-water circuit is connected to the secondary side of the heat exchanger, in
parallel with the heat circuit. The charging pump P2 performs on/off control of the
storage tank temperature, which is measured by the sensor S6. The circulation
pump P3 is controlled according to the 7-day program. Service-water heating takes
priority over room heating, i.e. the circulation pump P1 in the heat circuit is
stopped during tank charging.
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