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 after t = 2 x Transit time of the primary
valve.
The storage tank charging pump (SLP) is switched off after t = 2 x Transit 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
