Bedienungsanleitung Viessmann VITOTRONIC 200 (Seite 99 von 112) (Englisch)

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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 appliance restarts automatically with the selec-

ted operating program as soon as the power supply

utility enables the power supply again.

During power-OFF, central heating is provided by

the heating water buffer cylinder. If no heating water

buffer cylinder is installed or its temperature is too

low, the rooms are heated using the available auxili-

ary heaters, e.g. oil boiler, electric booster heater.

DHW can only be heated during the power-OFF

period using the auxiliary heaters.

2. No excess power, normal grid utilisation:

The heat pump is operated according to its settings

and the agreed conditions (electricity price).

3. Small amount of excess power:

The power supply utility provides the power at no

cost.

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

heat pump is started. To utilise the cheap power,

you can raise the set temperature for the following

functions or lower it for cooling:

■DHW heating

■Heating the heating water buffer cylinder

■Central heating

■Central cooling

■Enable electric booster heater

Note

The functions that can be utilised depend on the

heat pump type.

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 cheap and free

electricity

Electric power consumptions of the heat pump and the

electric booster heater are not taken into account when

calculating the seasonal performance factor.

Example: utilisation of excess power for DHW

heating

Cheap excess power

The heat pump is operated with the excess power from

the power supply utility to heat DHW to the increased

set DHW temperature.

In the time program you have set the time phases dur-

ing which DHW heating is enabled. The power supply

utility may start DHW heating, even outside the set

time phases.

To utilise even more cheap excess electricity for DHW

heating, the standard DHW temperature can be

increased. You can set the value for this temperature

increase.

■Standard DHW temperature:

50 °C

■Increase the DHW temperature when utilising power

generated on site:

10 K (10 Kelvin)

The DHW is heated to 60 °C. If DHW consumption is

the same, the next DHW heating period using power at

the standard tariff is postponed until later.

Free excess power

DHW heating is started immediately, regardless of

your settings in the time program.

The DHW will be heated to the maximum possible

temperature. This temperature has been set by your

contractor.

■Standard DHW temperature:

50 °C

■Max. temperature of your DHW cylinder (set by your

contractor):

65 °C

The DHW is heated to 65 °C. If DHW consumption is

the same, the next DHW heating period using power at

the standard tariff is postponed until later.

Note

■If you enable several functions for Smart Grid, the

functions for DHW heating will have priority over the

functions for central heating.

■The modified set temperatures do not affect the elec-

tric booster heater. The electric booster heater is

switched off at the limits that apply without Smart

Grid. In the example, this is the standard DHW tem-

perature of 50 °C.

Utilisation of power generated on site and utilisa-

tion of excess power from the grid (Smart Grid)

If the utilisation of power generated on site and Smart

Grid are enabled and active, the function with the larg-

est temperature increase or reduction is used.

Appendix

Terminology (cont.)

5817913

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