Bedienungsanleitung Viessmann VITOTRONIC 200 (Seite 95 von 112) (Englisch)

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Heating water buffer cylinder

A heating water buffer cylinder stores thermal energy

for central heating. All heating/cooling circuits are sup-

plied from this buffer cylinder.

Central cooling is possible only over one cooling cir-

cuit. A hydraulic bypass circuit prevents coolant from

entering the heating water buffer cylinder.

For further information on buffer cylinders, see "Buffer

cylinders".

Cascade

See "Heat pump cascade".

Controlled mechanical ventilation

A mechanical ventilation system provides continuous

ventilation of your interior.

The mechanical ventilation system comprises a venti-

lation unit, the ductwork, as well as supply air and

extract air vents.

An outdoor air filter installed in the ventilation unit pro-

tects against the ingress of pollen.

If a Viessmann ventilation unit is connected to the heat

pump control unit, all ventilation functions can be set at

the heat pump control unit.

Operating principle of the ventilation unit

Fig. 68 Example: Vitovent 300-F

ASupply air: e.g. for bedrooms, children's rooms, liv-

ing room

BExhaust air

COutdoor air

DExtract air: e.g. from the kitchen, bathroom, WC

EBypass not active:

Ventilation with heat recovery

FBypass active: ventilation without heat recovery,

e.g. for passive heating or cooling

Ventilation with heat recovery, bypass blocked

The air that is introduced into the rooms (supply air) is

preheated with the heat from the extracted air (extract

air) via a heat exchanger in the ventilation unit. For

this, bypass E is not active.

This means the energy loss is very low, compared to

airing via open windows.

Ventilation without heat recovery, bypass active

When bypass F is active, 100 % of the extract air

flow is routed past the heat exchanger, and filtered

fresh outdoor air at outside temperature is introduced

into the rooms.

Depending on the outside temperature and room tem-

perature, when the bypass is active, cooler or warmer

outdoor air is channelled into the rooms. This means

the rooms are passively cooled or passively heated.

Passive cooling

Cooler outdoor air is supplied to the rooms on cool

summer nights, for example.

The bypass is active for passive cooling if all of the fol-

lowing conditions are met:

Vitovent 200-C:

■It is at least 4 °C warmer inside than outside.

■The room temperature is at least 1 °C higher than

the "Set room temperature" for ventilation.

■The outdoor air is at least 0.5 °C warmer than the

"Min supply air t. byp".

Vitovent 300-F:

■It is at least 4 °C warmer inside than outside.

■The room temperature is at least 1 °C higher than

the "Set room temperature" for ventilation.

■The supply air exceeds the minimum temperature for

passive cooling ("Min supply air t. byp").

Appendix

Terminology (cont.)

5817913

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