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Control strategy
The control strategy specifies in which operating
ranges the heat pump and/or external heat generator
operates.
These operating ranges also depend on the operating
mode set by your heating contractor.
Parallel operation
ABA
+
Fig. 16
ϑAOutside temperature
ALower temperature limit, value dependent on the
control strategy
BUpper temperature limit
The heat pump is switched on for room heating/
room cooling and DHW heating as required.
The external heat generator is switched on for cen-
tral heating and DHW heating as required.
When outside temperature is above the upper tem-
perature limit B:
Room heating/room cooling and DHW heating are
supplied only by the heat pump.
The external heat generator does not start.
When outside temperature is between the two tem-
perature limits:
For normal heat demand, only the heat pump is
switched on.
For increased heat demand, the external heat gen-
erator is switched on in addition to the heat pump.
The heat pump can be switched on for room cool-
ing.
When outside temperature is below the lower tem-
perature 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.
Alternative operation
AA
Fig. 17
ϑAOutside temperature
ATemperature limit, value dependent on the control
strategy
The heat pump is switched on for room heating/
room cooling and DHW heating as required.
The external heat generator is switched on for cen-
tral heating and DHW heating as required.
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.
Appendix
Terminology (cont.)
6199646
64


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