Bedienungsanleitung Viessmann VITOCAL 250-A (Seite 65 von 72) (Englisch)

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Control strategy with constant temperature limits

Your contractor has permanently set the two outside

temperature limits A and B: See Fig. 16 and Fig. 17.

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).

3. Small amount of excess power:

The power supply utility provides the power at a low

price.

If a time phase is active in the time program, the

heat pump is started. To make use of low-cost elec-

tricity, additional energy can be stored in your sys-

tem. For this purpose, your contractor may have

increased (or reduced, for cooling) the set tempera-

ture values for the following functions:

■DHW heating

■Buffer cylinder heating

■Central heating

■Room cooling

4. Large amount of excess power:

The power supply utility provides the excess power

at no cost.

The power supply utility starts the heat pump imme-

diately, even if no time phase is active in the time

program. System components are heated to the

max. possible temperatures or cooled to the min.

possible temperatures.

Information about operation with low-cost and free

electricity

The electric power consumption of the heat pump is

not taken into account when calculating the seasonal

performance factor.

Example: Utilisation of excess power for DHW

heating

Low-cost excess power

The heat pump is operated with excess power from the

power supply utility to heat DHW to the increased set

DHW temperature.

Appendix

Terminology (cont.)

6199646

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