FUNCTION DESCRIPTION
104
smart Econ - emz-HCW - 180116
Outside the time blocks, the domestic hot water is heated only at a reduced temperature.
Example:
Set temperature 50°C, hysteresis 10K
→
temperature between 40°C and 50°C
In setback mode, the temperature is reduced by the hysteresis
→
Temperature between 30°C and 40°C.
Domestic hot water priority
When domestic hot water priority is activated, all pumps that supply the heating circuits are switched
off during domestic hot water operation or storage tank charging.
Outdoor temperature-controlled setting
In principle, the heating circuits are set to the flow temperature depending on the current outdoor
temperature.
Unmixed heating circuits cannot themselves be individually controlled, as all are necessarily sup-
plied with the same flow temperature.The controlled variable (actual value) is usually the boiler tem-
perature, but system temperature (total flow) or buffer temperature is also possible depending on
the design of the heating system.
Control loops with mixers
If several heating circuits are present in a system and they are to be supplied with different flow tem-
peratures, this is done by using mixers (usually 3-way mixers) and one sensor each for recording
the current flow temperature.
Mixers allow much more precise temperature control than e.g. valves or the permanent switching on
and off of the pumps.
The flow temperature required depending on the outdoor temperature is calculated using the heat-
ing curve.An individual heating curve can be defined for each heating circuit.
Heating curve
The heating curves used for this controller have the special feature that their course can be set pro-
gressively.This is made possible by the fact that the heating curve is determined differently than
usual - not only by two, but by four points.
The four reference points of the outdoor temperature (P1...P4) apply globally, i.e. for all heating
curves.
Set in the menu ›INSTALLER‹ - ›COMMISSIONING‹ - ›BASE OT HEAT CURVE‹, see “Change
heating curve” on page 113
The flow temperature set point belonging to each reference point can be set individually for each
heating curve.This is determined for the first time by the specialist installer during commissioning
and depends on the insulation value of the building and the user's wishes for comfort and warmth.
Set in menu ›HEAT CIRCUITS‹ - ›HEAT CIRCUIT X‹ - ›HEAT CURVE‹
or
›MIXER HEAT CIRC. X‹,
see “›HEAT CIRCUITS‹ menu (Installer)” on page 130
The settings in the ›HEAT CURVE‹ menu are adapted to the heating circuits for radiators, in the
›MIXER HEAT CIRC. X‹ menu to heating circuits for underfloor heating.
