Bedienungsanleitung Viessmann Vitocal 151-A (Seite 68 von 76) (Englisch)

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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

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