Bedienungsanleitung Viessmann VITOTRONIC 200 (Seite 91 von 112) (Englisch)

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The enthalpy heat exchanger is able to obtain not only

heat from the extract air, but also a large proportion of

the moisture it contains. This enables the humidity

heat exchanger to create a more pleasant indoor ambi-

ence, particularly during colder times of year, as it pre-

vents the indoor air becoming too dry.

Power-OFF

At times of high demand for electricity, your power sup-

ply utility can block the power supply to your appliance

[Germany]. During this power-OFF period, the mes-

sage "Power-OFF" is shown on the display.

The appliance restarts automatically with the selected

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 auxiliary heaters,

e.g. oil boiler, electric booster heater.

DHW can only be heated during the power-OFF period

using the auxiliary heaters.

Underfloor heating

Underfloor heating systems are slow, low temperature

heating systems that respond only very slowly to short

term temperature changes.

Therefore, heating to the reduced room temperature at

night or switching on "Economy mode" during short

absences does not result in significant energy savings.

Reduced noise operation

Air/water heat pumps have an integrated fan. The

speed of this fan can be reduced with this time pro-

gram. This reduces the noise caused by the fan, e.g.

at night.

Note

The reduced fan speed results in a reduced available

heating output. With air/water heat pumps with output

control, this can be compensated by increasing the

compressor output if required. This will slightly reduce

the seasonal performance factor.

Heating mode/cooling mode

Standard heating mode/cooling mode

For periods when you are at home during the day, you

heat or cool your rooms to the standard room tempera-

ture. Set the periods (time phases) using the time pro-

gram for central heating/cooling.

Reduced heating mode

For periods when you will be absent or during the

night, you heat your rooms to the reduced room tem-

perature. Set the periods using the time program for

central heating/cooling. With underfloor heating sys-

tems, reduced heating mode only yields limited energy

savings (see "Underfloor heating system").

Note

In reduced heating mode, cooling is disabled.

Room temperature-dependent heating/cooling

mode

With room temperature-dependent operation, a room

will be heated or cooled until the selected room tem-

perature has been reached. For this, a separate tem-

perature sensor must be installed in the room.

The heating output/cooling capacity is regulated inde-

pendently of the outside temperature.

Weather-compensated heating/cooling mode

In weather-compensated mode, the flow temperature

is controlled according to the outside temperature. This

means that only the necessary amount of heating or

cooling is provided to heat or cool the rooms to the

room temperature you have selected.

The outside temperature is recorded and transferred to

the heat pump control unit by a sensor fitted outside

the building.

Appendix

Terminology (cont.)

5817913

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