Application 4
EI.65.D4.02
53
6.3.5 Application 4
System diagram 4
Common primary heat exchanger for a heat circuit with a mixing valve and a hot-
water circuit with indirect control of storage tank.
Heat circuit The mixing valve M2 controls the flow temperature in the mixing circuit, which is
measured by the sensor S4. The sensor S1 measures the flow temperature on the
secondary side of the heat exchanger. The temperature level here is determined by
S4. The return temperature measured by the sensor S5 can be limited. The circula-
tion pump P1 is running when the reference flow temperature is above 20 °C or
the outdoor temperature is below 2 °C.
Hot-water circuit The motor valve M1 controls the charging temperature, which is measured by S1.
The charging pump P2 is used to perform on/off control of the storage tank
charging. The storage tank temperature is measured using the sensor S6. The cir-
culation pump P3 is controlled according to the 7-day program.
The hot-water circuit is connected to the secondary side of the heat exchanger, in
parallel with the heat circuit, and parallel operation is possible to a limited extent.
When tank charging starts, P2 is started and the charging temperature at S1 is
raised to the desired level. During charging, the mixing valve M2 adjusts the flow
temperature of the heat circuit as well as possible.
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