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Viessmann VITOTRONIC 200 Manual

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Mixer
Central heating
A mixer mixes the heated heating water with the
cooled water returning from the heating circuit. The
water, thus brought to the right temperature, is pumped
to the heating circuit by the heating circuit pump. The
heat pump control unit adjusts the heating circuit flow
temperature via the mixer to suit different conditions,
e.g. changing outside temperatures.
Central cooling
The flow temperature is also set via a mixer with cen-
tral cooling.
In addition, the flow temperature is kept above the con-
densation point of the indoor air (dew point) via a
mixer. This prevents condensation forming on the floor.
Buffer cylinder
A buffer cylinder stores a large quantity of heating
water or coolant. This allows the heating/cooling cir-
cuits to be supplied over a longer period without the
heat pump needing to start up, e.g. during power-OFF.
Due to the large buffer volume, the heat pump contin-
ues to operate to heat or cool the buffer cylinder than it
would if there were no buffer cylinder.
Infrequent starting of the heat pump and long runtimes
ensure long and efficient operation.
By adjusting the time program appropriately, you can
use economical night tariff power to heat the buffer cyl-
inder to a higher level, or cool it to a lower level. During
the daytime, the heating/cooling circuits can be sup-
plied with this cheap energy.
The following buffer cylinders can be built into your
system:
■Heating water buffer cylinder: See "Heating water
buffer cylinder".
■Heating water/coolant buffer cylinder: See "Heating
water/coolant buffer cylinder".
Room temperature
■Standard room temperature:
Set the standard room temperature for periods when
you are at home during the day.
■Reduced room temperature:
For periods when you will be absent or during the
night, set the reduced room temperature; see: "Heat-
ing mode/cooling mode".
■Room temperature for ventilation:
This room temperature influences activation of the
bypass: see "Controlled mechanical ventilation".
Return temperature
The return temperature is the temperature at which the
heating water or coolant leaves a system component
such as a heating circuit.
Smart Grid (SG)
To enable you to use Smart Grid, your contractor has
connected the heat pump control unit to the mains
supply via 2 switching contacts. The power supply util-
ity can use these switching contacts to match opera-
tion of the heat pump to the current grid utilisation
level.
Appendix
Terminology (cont.)
5817913
… 98 …


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