Application 3
EI.65.D4.02
50
System diagram 3B
Common primary heat exchanger for a heat circuit and a hot-water circuit with
indirect control of storage tank. A changeover valve is used to direct flow to the
heat circuit or to the hot-water storage tank (instead of the pump used in applica-
tion 3A).
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 hot-water circuit is connected to the secondary side of the heat exchanger, in
parallel with the heat circuit. The pump P1 and the changeover valve P2 are used
to perform 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 pro-
gram.
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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