3.2 System layout
The unit is designed for a 2-conductor system. The
system has 2 medium pipes (conductors: Supply
and return flow) for cooling using a cold medium or
heating using a warm medium.
In cooling mode the combined cooling register/
heating register in the indoor unit extracts the heat
from the room air by absorbing it into the operating
medium. A circulation pump transports the heated
medium to a chiller which extracts the heat from
the medium in an evaporator and then passes it on
to the outside air via a cooling cycle in a con-
denser
.
The cooled operating medium is then fed in once
again to the unit medium circuit. With 2-conductor
systems, which are used for cooling or heating, the
heating capacity can be generated through a
chiller with heat pump function or through a boiler
and fed into the circuit. In heating operation, the
indoor unit can deliver the heat from the operating
medium to the room air.
In order to avoid cold air blowing out in heating
mode, it is necessary to consider a minimum tem-
perature of the medium in heating operation.
Fig. 3: Schematic figure without basic hydraulic components
A: Outdoor area
B: Indoor area
1: Chiller
2: Cold water drain
3: Valve for hydronic balancing
4: Condensate drainage line
17
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