Application 5
EI.65.D4.02
57
6.3.6 Application 5
System diagram 5A
Heat circuit and 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 the outdoor temperature is below 2 °C.
Hot-water circuit The motor valve M2 controls the charging temperature, which is measured by the
sensor S4. The upper and lower storage tank temperatures are measured by the
sensors S6 and S7, respectively. A low S6 temperature causes the charging pump
P2 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 S5. The circulation pump
P3 is controlled according to the 7-day program.
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