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When the outside temperature is above temperature
limit A:
Room heating/room cooling and DHW heating are
supplied only by the heat pump.
The external heat generator does not start.
When the outside temperature is below temperature
limit A:
The heat pump does not operate.
Room heating and DHW heating are supplied only
by the external heat generator.
Room cooling is switched off.
The temperature limits of these operating ranges are
determined in the control strategy.
Ecological control strategy
The control unit specifies the temperature limit A
based on what will achieve the lowest CO2 emissions.
The heat pump control unit calculates the resulting
CO2 emissions on the basis of the primary energy fac-
tors for electricity and fossil fuels.
The primary energy factors are stored in the heat
pump control unit. During an update, the primary
energy factors are automatically updated.
Economical control strategy
The control unit specifies the temperature limit A
based on what will achieve the lowest running costs.
The heat pump control unit calculates the running
costs on the basis of the energy prices you have
entered for electricity and fossil fuels.
You can enter the energy prices via the ViCare app.
Control strategy with constant temperature limits
Your contractor has permanently set the two outside
temperature limits A and B: See Fig. 18 and Fig. 19.
Return temperature
The return temperature is the temperature at which the
heating water or coolant leaves a system component
such as a heating circuit.
Safety valve
Safety equipment that must be installed in the cold
water pipe by your contractor. The safety valve opens
automatically to prevent excess pressure in the DHW
cylinder.
The heating circuits are also equipped with safety
valves.
Smart Grid (SG)
To enable you to use Smart Grid, your contractor has
connected the heat pump control unit to the mains
supply via two switching contacts. The power supply
utility can use these switching contacts to match oper-
ation of the heat pump to the current grid utilisation
level.
The following 4 options for grid utilisation are taken
into account:
1. Not a lot of power in the grid (grid overload):
The power supply utility can block the heat pump if
not a lot of power is available.
The heat pump restarts automatically with the set
operating program as soon as the power supply util-
ity restores the power supply.
During power-OFF, central heating is provided by
the buffer cylinder. If there is no buffer cylinder
installed or its temperature is too low, the rooms will
be heated only by the instantaneous heating water
heater.
Note
Your contractor must enable operation of the instan-
taneous heating water heater during power-OFF
periods.
2. No excess power, normal grid utilisation:
The heat pump is operated according to its settings
and on the agreed terms (electricity price).
Appendix
Terminology (cont.)
6199692
68


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