Application 17, Type 2 Only
EI.65.D4.02
111
System diagram 17B
Two separate heat circuits connected directly to the district heating network and
with mixing via by-pass valves. Hot-water circuit with indirect and continuous
control of storage tank charging system.
Note:
ECL 2000 Type 2 must be used to control this application.
Heat circuit 1 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.
Heat circuit 2 The motor valve M2 controls the flow temperature, which is measured by the sen-
sor S4. The return temperature measured by the sensor S5 can be limited. The cir-
culation pump P2 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 M3 controls the hot-water temperature measured by S10 continu-
ously. 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 pos-
sible to limit the return temperature measured by S11. The pump P4 maintains cir-
culation through the heat exchanger but is not controlled by the ECL 2000.
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