Application 5
EI.65.D4.02
58
System diagram 5B
Heat circuit and hot-water circuit with indirect control of storage tank and con-
tinuous control and regulation of 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 M2 performs continuous control of the hot-water temperature
measured by 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 pump P3
maintains circulation through the heat exchanger and is controlled according to the
7-day program.
To inform the controller that the system requires con-
tinuous control of the tank charging system, the Con-
tinuous setting in the hot-water service menu must be set
to YES.
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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