Application 6
EI.65.D4.02
62
System diagram 6B
Common primary heat exchanger for a heat circuit and a hot-water circuit with
tank charging system. A changeover valve is used to direct flow to the heat circuit
or the hot-water circuit.
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 determines the temperature level at S1. The upper and lower stor-
age 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 tem-
perature measured by S2. The pump P4 maintains circulation through the storage
tank but is not controlled by the ECL 2000. The changeover valve P2 directs water
flow to the heat circuit or to the hot-water circuit. Parallel operation of the heat
and hot-water circuits is not possible.
To inform the controller that a changeover valve is being
used, the Pump function setting of the hot-water service
menu must be set to NO.
Appendix C of this Guide provides an overview of the
service menus. The ECL 2000 User’s Guide (ref. [2])
provides detailed instructions for operating the service
menus.
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