Cooling Functions; Cooling Circuit - Viessmann Vitotronic 200 Operating Instructions Manual

Terminology
(cont.)

Cooling functions

The natural cooling and active cooling functions are
supported depending on the heat pump type and the
installed accessories.
Brine/water heat pumps:
"Natural cooling"
■
With this function, the temperature level of the
ground is transferred directly to the heating/cooling
circuit or the separate cooling circuit. Compared with
active cooling, the available cooling capacity is lower
in natural cooling mode. As the compressor is
switched off, this function is very energy efficient and
therefore suitable for constant cooling.
■ "Active cooling"
If the natural cooling capacity is insufficient and the
necessary accessories are installed, the control unit
can automatically switch to active cooling mode.
In active cooling mode, the temperature of the heat
transfer medium cooled underground is reduced
even further before it is transferred to the heating/
cooling circuit or separate cooling circuit. As a result,
the available cooling capacity is significantly higher
compared to natural cooling.
Constant cooling operation results in increased
power consumption as the compressor is in opera-
tion in addition to the circulation pumps.
You can enable and block the active cooling mode
individually.
Cooling curve
See "Heating curve/cooling curve".

Cooling circuit

See "Heating/cooling circuits".
Output matching
In heat pumps with output-dependent control, the com-
pressor speed is automatically matched to the required
output. Heat pumps with output-dependent control are
therefore more efficient than heat pumps without out-
put adjustment.
Ventilation
See "Controlled domestic ventilation".
Air/water heat pumps:
■ "Natural cooling"
is not available.
■ "Active cooling"
Cooling takes place by reversing the heat pump
operation. A high cooling capacity is available.
When utilising power generated on site, the power
consumption of the compressor can automatically
adapt to the power available from the photovoltaic sys-
tem. This optimises the utilisation of power generated
on site.
Appendix
93