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5.3.6. Buffer DHW load
The DHW heating from the thermal store is turned on at an active heat request for DHW and
if the temperature at the thermal store sensor is at least 8°C higher than at the DHW sensor.
The DHW heating from the thermal store is shut down if the temperature difference between
the thermal store and HW storage tank is less than 4 °C or if the temperature at the DHW
sensor has reached the desired value and no DHW heat request is present.
5.3.7. DHW priority
If this function is activated, the reference flow temperature during a DHW heating will be set
to the minimum flow temperature (5.1.9). Reducing the output of the heating circuit can bring
substantially shorter time of DHW heating up.
5.3.8. DHW sensor
Here the DHW sensor is selected.
5.3.9. PV contact
This sensor input could be used as a PV-contact to signal overflow from a Photovoltaic
System. If the PV-Contact is closed, the mode of DHW heating is changed to „comfort“ (the
desired DHW temperature will be set to the value of 5.3.4 DHW Comfort).
For information about the operation and the connection of PV contact, refer to the
technical description of your PV system.
5.4. 14 day reference value (14 day ref. val.)
The menu is available only if the mode 14 day ref. val. is set in menu 5.1.1.
Setting the program for heating circuit mode 14 day ref. val. In this menu, the start date and
time for the program can be set together with the desired temperatures for the next 14 days.
5.5. Differential thermostat (Difference)
The menu is available only if the differential thermostat is assigned to an output
in menu 7. Special functions.
A differential thermostat that will switch on the output as soon as the switch-on temperature
difference between sensors 5.5.2. and 5.5.3. is reached and switch it off if the switch-off
temperature difference between sensors 5.5.2. and 5.5.3. is not reached any more.
5.5.1. Temperature difference for switching on/off (ΔT DF on / ΔT DF off)
Temperature difference between a source sensor 5.5.2. and consumer sensor 5.5.4. for
switching on (ΔT on) and off (ΔT off) the respective controller output.
5.5.2. Heat source sensor (DF-Source)
Temperature sensor for a heat source (e.g. a solar collector) – a higher temperature is
expected than at the consumer sensor.
5.5.3. Min. source temperature (Diff. Tmin)
Min. temperature at the heat source sensor that will permit the differential thermostat function.
If the temperature Diff. Tmin is not reached at the heat source sensor, the differential thermostat
output contacts will not close.
5.5.4. Consumer sensor (DF-Drain)
Temperature sensor for a consumer (e.g. a thermal store) – a lower temperature is expected
than at the source sensor.