Application 6
EI.65.D4.02
61
6.3.7 Application 6
System diagram 6A
Common primary heat exchanger for a heat circuit and a hot-water circuit with
tank charging system.
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 the outdoor temperature is below 2 °C.
Hot-water circuit The motor valve M1 controls the charging temperature measured by the sensor S5,
which in its turn controls the temperature level at S1. The upper and lower storage
tank temperatures are measured by the sensors S6 and S7, respectively. A low S6
temperature causes the charging pump P3 to start and the pump is stopped when a
high temperature is measured at S7. It is possible to limit the return temperature
measured by S2. The pump P4 maintains circulation through the storage tank but
is not controlled by the ECL 2000.
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