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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
C
E
B
D
A
F
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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