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EXTERNAL CONTROLLED DHW PRODUCTION
USE OF SOLAR CELL FUNCTION
You can operate your DHW HP environmentally friendly and economically with energy generated by your photovoltaic
solar cell installation. This operation mode uses an increased set point temperature, which can be individually selected and
determines the additional energy storage capacity. In order to use this kind of operating mode, you have to wire the solar cell
inverter exit to the DHW HP controller terminal block and to select in the "SolCel" menu the desired operating mode "HP
only", "EL only" or "HP + EL". See page 13.
Hint. The wiring of the controller determines the operating mode.
Wiring of a solar cell Installation
The potential free contact of the inverter has to be wired to DHW HP controller. The selected connectors of the
terminal block determine the operating mode possible, when the inverter contact is closed. The power level of the
inverter exit can be adjusted. Please do select an appropriate power level in order to ensure a smooth operating
(consider the instructions of the inverter producer). See "wiring diagram", page 12".
Wiring recommendations
SINGLE INVERTER OPERATION:
Connect the inverter exit to the terminal block CN6 connectors 5 –6 (T3). Bridge terminal block CN6 connectors 5 –6 to
terminal block CN5 connectors 3-4 (T4).
TWO INVERTER OPERATIONS:
Connect the first inverter to terminal block CN6 connectors 5 –6 (T3) for HP operation.
Connect the 2nd inverter to terminal block CN5 connectors 3-4 (T4) for auxiliary electrical (EL) operation.
The desired operation mode "only HP", "only EL" or "HP + EL" can be selected via the parameter value of the
"SolCel" parameter.
You operate your DHW HP with self-generated energy, when the inverter contact is closed and the „SolCel" function is
activated. The display indicates the actual preselected operation mode "only HP", "only EL" or "HP + EL". If the inverter
contact re-opens (not enough energy available) the operation mode and the display will be reset to normal operating mode.
The set point for "only HP" can be adjusted in the menu "SC-HP" in between 5°C and Tmax.
Factory setting is 52°C.
The set point for "only EL" or "HP + EL" can be adjusted in the menu "SC-HP" in between 5°C and Tmax.
Factory setting is 53°C.
If the solar function is deactivated, it will change to normal operation mode. with the settings of the normal set point.
The heat pump operates with a hysteresis of +1 -3°C around the set point. The supplementary heating operates with a
hysteresis of +-1°C.
Please take care that the inverter potential free exit is equipped with gold plated contacts because of the low intensity
current.
USE OF HOLIDAY FUNCTION
With the use of the holiday function you are able to lower the power consumption during your holiday and absence from
home. When activated, the hot water production will be locked unless the DHW temperature is equal to "T2 min". See page
11. At the "T2min" temperature level the HP will resume working, in order to protect the device and the installation against
frost. Should the temperature fall below "T2 min" -1°C, the supplementary heating will be released. If the temperature falls
further below "T2 min" -3°C the heat pump will also start. When the temperature reaches "T2 min" +1°C the DHW
production will be locked again.
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