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When there is no heating operation or when the flow temperature in the system is lower, the
storage tank charging pump is switched on immediately.
If a storage tank thermostat is used, the storage tank charging pump is switched on when the
temperature T =
Charging temperature
– 5 °C is reached at sensor VFS.
Note!
The charging temperature VFS is controlled in system Anl 2 by the primary valve. In all the other
systems (Anl 4, 5, 7, 8, 9 and 10) the mixing valve regulates the charging temperature VFS.
When the Circulations pump function is active, the circulation pump remains in operation ac
-
cording to the time schedule. The pumps is switched off when this function is deactivated.
The Mixing valve always active function allows the heat exchanger to maintain the charging
temperature using the mixing valve. The heat exchanger charging pump remains switched on
and the return flow temperature is not limited outside the times-of-use.
Stop storage tank charging
The controller stops charging the storage tank when the water temperature in the storage tank
measured at sensor SF1 exceeds the temperature T =
Charging temperature
+
Hysteresis
by
0.1 °C. When there is no heating operation or when the flow temperature demand in the system
is lower, the corresponding valve is closed.
The storage tank charging pump is switched off when the charging temperature at sensor VFS
has fallen below the
Storage tank charging pump deactivation limit;
however, at the latest, af-
ter t
= 2 x Transit time of the primary valve.
In the default setting, the storage tank is charged by 5 °C to at least 50 °C when the storage tank
temperature falls below 40 °C. The charging temperature is 55 °C. On completing the storage
tank charging, the heating valve is closed and the charging pump continues to run until the
charging temperature falls below 50 °C.
Functions
WE Configuration
Storage sensor SF1 ON Co4 -> Fb00 = ON
Storage tank system OFF Co4 -> Fb10 = ON
Circulation pump OFF Co4 -> Fb04
Mixing valve always active OFF Co4 -> Fb11
EB 5179 EN 55
Appendix