Viessmann Vitotronic 200 Operating Instructions For The System User page 63

Terminology
Heating/cooling circuits and separate
cooling circuit
■ Heating circuit
A heating circuit is a sealed circuit
between the heat pump and consum-
ers (radiators), in which the heating
water circulates.
A heating system may have several
heating circuits, e.g. one heating cir-
cuit for the rooms occupied by you and
one heating circuit for the rooms of a
separate apartment.
■ Cooling circuit
When cooling via a heating circuit, e.g.
an underfloor heating system, we refer
to a cooling circuit.
■ Separate cooling circuit
A separate cooling circuit is a sealed
circuit that supplies a cooling appli-
ance, such as a fan convector or a
chilled ceiling. Cooling takes place
independently of the outside tempera-
ture.
A separate cooling circuit cannot pro-
vide heating.
Heating circuit pump
Circulation pump for the circulation of the
heating water in the heating/cooling cir-
cuit.
Heating water buffer cylinder
Thermal energy for central heating can
be stored in a heating water buffer cylin-
der. This safeguards the heat supply for
all connected heating circuits even when
the heat pump is not operational for lon-
ger periods, e.g. during a power-OFF
period.
(cont.)
Actual temperature
Current temperature at the time of the
scan, e.g. actual DHW temperature.
Cooling functions
The natural cooling and active cooling
functions are supported subject to the
heat pump type and the installed acces-
sories.
Brine/water heat pumps:
■ Natural cooling
With this function, the temperature
level of the ground is transferred
directly to the heating/cooling circuits.
Compared to active cooling mode, the
available cooling capacity is lower in
natural cooling mode. As the heat
pump is switched off, this function is
very energy efficient and therefore
suitable for permanent cooling.
■ Active cooling
If the natural cooling capacity is insuf-
ficient and the required accessories
are installed, the control unit can auto-
matically switch to active cooling
mode.
In active cooling mode, the tempera-
ture of the heat transfer medium
cooled underground is reduced even
further before it is transferred to the
heating/cooling circuits. As a result,
the available cooling capacity is signif-
icantly higher compared to natural
cooling.
Appendix
63