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1) If the air temperature is above 4°C, then the defrosting occurs running both com-
pressor and fan. The fan runs at speed D3 (Fan max speed).
2) If the air temperature is below 4°C, then the defrosting occurs running the com-
pressor and stopping the fan.
Before defrosting is completed the fan stops for a short period to allow the excess
water in the unit to leave the unit from the condensate drain. Defrosting automatically
stops when the temperature of the evaporator (T2) becomes higher than the set point
(D10).
7.6. Photovoltaic Function
The domestic hot water heat pump (DHWHP) can be controlled by a signal from a solar
photovoltaic (PV) converter or an energy meter, either as simple start/stop via a poten-
tial free contact or by a variable signal.
Figure 20 represents possible installation configurations with or without energy meter.
Using the variable signal option, a certain output (DC or mA) from the (PV) inverter or
the energy meter corresponds to a given amount of excess power for use in the DHWHP.
This excess power can be used to activate either the electrical immersion heater, the
heat pump (HP) or both.
Figure 20 – PV installation 1: control signal from inverter. PV installation 2: control signal from energy meter.
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