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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.
When the flow sensor VFS is active, the set point in the heat exchanger charging circuit is af
-
fected by the system deviation in the storage tank charging circuit when the storage tank charg
-
ing pump is switched on:
If the temperature measured at the flow sensor is smaller than the required charging tempera
-
ture, the set point in the heat exchanger charging circuit is raised by 1 °C every minute.
If the set point in the heat exchanger charging circuit reaches the value in
Maximum charging
temperature
parameter, it is not raised any further; an
Err 10
alarm is generated.
Stop storage tank charging
The controller stops charging the storage tank when the water temperature in the storage tank
measured at sensor SF2 (
DHW demand OFF
) exceeds the set point by 0.1 °C. The primary
valve (Anl 2) or the mixing valve in the DHW circuit are sent pulse signals until the heat
exchanger charging temperature on the primary side at sensor VFT has fallen below the
Heat
exchanger charging pump deactivation limit
.
The heat exchanger charging pump is switched off according to the time schedule and depend-
ing on the temperature. When the flow set point of the primary heating circuit is lower than the
Heat exchanger charging pump deactivation limit
, the heat exchanger charging pump (TLP) is
first switched off when the primary heat exchanger charging temperature at sensor VFT has
dropped to the same level as the flow set point of the primary heating circuit. The heat
exchanger charging pump is switched off at the latest aftert=2xTransit time of the primary
valve.
The storage tank charging pump (SLP) is switched off aftert=2xTransit time of the primary
valve or when the storage tank charging temperature in the secondary circuit at sensor VFS has
fallen below the
Storage tank charging pump deactivation limit
.
The circulation pump is switched on and off according to a time schedule.
Functions
WE Configuration
Storage sensor SF1 ON Co4 -> Fb00 = ON
Storage sensor SF2 ON Co4 -> Fb01 = ON
Flow sensor VFS ON Co4 -> Fb03
Circulation pump OFF Co4 -> Fb04
Storage tank system OFF Co4 -> Fb10 = OFF
Mixing valve always active OFF Co4 -> Fb11
EB 5179 EN 53
System-wide functions