Viessmann VD2 Series Instructions d'exploitation télécharger pdf (Page 25)

Settings

Changing the heating pattern

Vitocontrol-S, VD2/CT3/CM2

The heating pattern of the boiler is influenced by the outdoor temperature and

the settings of the ”shift” and ”slope” of the ”heating curve”. Heating curves

represent the relationship between the outdoor temperature and the boiler

water or supply temperature. Put simply: the lower the outdoor temperature,

the higher the boiler water or supply temperature.

You can change the setting of the heating curve if you establish, over a prolonged

period during the heating season, that the room temperature does not meet your

requirements.

Please observe the difference in the heating pattern over a sufficiently long

period before altering the settings again.

Short-term changes in the room temperature are carried out with the ”ts”

selector knob or with the ”tm” button.

Please note:

In the factory settings, the slope is set to 1.4 and the shift to 0.

The heating curves shown apply to the following settings:

”Shift of heating curve” = 0

With a different shift setting, the curves are shifted parallel in a vertical direc-

tion.

”Normal room temperature “s” = approx. 20°C / 68°F.

The slope of the heating curve is nor-

mally within the range marked

A for underfloor heating systems,

B for modulating heating systems,

C for heating systems with boiler

water temperatures over 75°C /

167 °F.

Examples

Well insulated house in protected

position (radiator heating):

Slope = 1.2

House in exposed position or

with old heating system

(radiator heating):

Slope = 1.6

5351 341 v1.2

Slope

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Viessmann VD2 Series Instructions d'exploitation Page 25