IVT PKS 1000, Installer'S Manual, Page: 7 / 36

Passive cooling
6 720 642 838 (2010/03)
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4 Passive cooling
The passive cooling station is designed for operation
connected to liquid/water heat pumps 6-17 kW with
underfloor heating systems or fan convectors. The
cooling station consists of a heat exchanger, a
circulation pump, a mixing valve and a circuit board for
control of cooling operation. In cooling operation the
system works to maintain the room temperature despite
the increasing outdoor temperature for greater comfort.
With passive cooling, the compressor in the heat pump
is not used. Instead, the cooling is controlled by the
collector circuit flow. All heating circuits can be used for
cooling.
4.1 Passive cooling 1
Passive cooling in combination with a fan convector. The
temperature is controlled via a thermostat in the fan
convector. It follows therefore that the fan is deactivated
if the room temperature falls. The temperature can also
be regulated using room temperature sensors. In this
case, the mixing valve to the cooling circuit is closed but
the fan continues to run until the room temperature has
fallen to the specified value. The desired flow
temperature is set by the installer.
The system must be protected from condensation,
either by the flow line temperature being set sufficiently
high that no condensation occurs, or by supplementing
with condensation draining/insulation. It is also possible
to supplement the system with a room transducer for
relative humidity and temperature, which ensures that
the flow line temperature is held at a level so that the
condensation does not build up, and dew point monitor,
which shuts off the cooling function if condensation is
created nonetheless.
4.2 Passive cooling 2
Passive cooling in combination with underfloor heating
system. This solution uses the existing underfloor
heating system to cool the room. The system must be
protected from condensation, either by the installer
setting the flow line temperature sufficiently high that
the no condensation occurs. Alternatively, the room
transducer for relative humidity and temperature is
installed, which gives the controller the opportunity to
establish appropriate flow temperature, which does not
cause condensation. The system can also be
supplemented with a dew point monitor, which
interrupts cooling operation if condensation is created
nonetheless.