Manual Viessmann Vitodens 222-F - 2023 (page 60 of 68) (English)

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Underfloor heating

Underfloor heating systems are slow, low temperature

heating systems that respond only very slowly to short

term temperature changes.

Heating with reduced room temperature at night there-

fore does not result in any significant energy savings.

Heating mode

Operating modes

To heat your home, the heat generator provides heat

as specified by the set flow temperature. The operating

mode determines whether the flow temperature is

specified with a fixed value or whether it is automati-

cally calculated and adjusted subject to several ancil-

lary conditions.

Your contractor can configure the following operating

modes during commissioning:

■Weather-compensated operation

■Continuous operation

■Room temperature-dependent operation

Comfort mode

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

your home with the comfort room temperature or the

comfort flow temperature, depending on the operating

mode. Set the periods (time phases) with the "Com-

fort" temperature level using the time program for cen-

tral heating.

Continuous operation

In continuous operation the heat generator provides

heating water with a constant flow temperature regard-

less of the outside temperature.

With this operating mode, you can operate several

heating circuits via your control unit.

Standard heating mode

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

your home with the normal room temperature or the

normal flow temperature, depending on the operating

mode. Set the periods (time phases) with the "Stand-

ard" temperature level using the time program for cen-

tral heating.

Room temperature-dependent heating operation

In room temperature-dependent operation a room is

heated until the set room temperature has been

reached. For this, a separate temperature sensor must

be installed in the room.

The heating output is controlled independently of the

outside temperature.

With this operating mode, you can operate one heating

circuit via your control unit. You can input some of the

settings for this heating circuit at your room tempera-

ture controller.

Reduced heating operation

For periods when you will be absent or during the

night, heat your rooms with the reduced room temper-

ature or the reduced flow temperature, depending on

the operating mode. Set the periods (time phases) with

the "Reduced" temperature level using the time pro-

gram for central heating.

With underfloor heating systems, reduced heating

operation only yields limited energy savings (see

"Underfloor heating system").

Weather-compensated heating operation

In weather-compensated operation, the flow tempera-

ture is controlled according to the outside temperature.

More heat is made available at a lower outside temper-

ature than at a higher one.

The outside temperature is captured and transmitted to

the control unit by a sensor fitted outside the building.

With this operating mode, you can operate several

heating circuits via your control unit. If remote control

units are installed in your rooms, you can also adjust

the settings at the remote control units.

Heating curve

Heating curves illustrate the relationship between the

outside temperature, the set room temperature and the

flow temperature. The lower the outside temperature,

the higher the flow temperature.

In order to guarantee sufficient heat with minimum

energy consumption at any outside temperature, the

conditions of your building and system must be taken

into consideration. The heating curve is adjusted by

your contractor for this purpose.

Appendix

Terminology (cont.)

5593212

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Viessmann Vitodens 222-F - 2023 Manual

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