Active Cooling - Viessmann Vitocal 300-G Manual

Active cooling

The AC-Box efficiently combines
heating and cooling
The Viessmann AC-Box combines active
and natural cooling in heat pump systems,
thus making them even more versatile
and convenient. The system changes over
automatically according to the required room
temperature. If only a low cooling capacity
is required, natural cooling is sufficient, but
if that is no longer enough active cooling
is added.
Cooling using tiny amounts of energy
With natural cooling, the compressor circuit
is not needed. Only the brine and heating
circuit pumps are operational and utilise the
temperature differential between the rooms
and the ground or groundwater. In this way,
rooms can be cooled very cost effectively.
AC-Box
Keep cool when it gets really hot outside
With active cooling, the compressor circuit
starts to work. The internal control unit, in
conjunction with the AC-Box, reverses the
output and input functions to actively transfer
heat out of the building to the geothermal
probe. The heat can also be used for DHW
heating and any other heating requirements.
Cold water then flows through the heating
circuit or separate cooling circuits – cooled
down to 7°C if required.
Utilising extracted energy
Incidentally, direct use can also be made
of the heat transferred out of the rooms in
this way, for example for DHW heating or to
heat a swimming pool. This means cooling
and heating functions can be combined
extremely effectively.
Well developed technology:
The AC-Box (to the left of the heat
pump) simply starts the relevant
heat pump function – either active or
natural cooling, depending on
the required cooling capacity.