Page 67 - Advanced Course
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KNX ADVANCED COURSE
2-pipe system
The basic structure of a 2-pipe system is the same as the other two variants. We still
require a battery for the medium to circulate through and a fan to let the air flow through
the battery. Only one battery however is used in this variant. The heated or cooled
medium is conducted through this battery and the air is thus warmed or cooled.
Depending on the season, the fan coil unit can be used for heating or cooling.
Controller
Figure 42: Structure of the 2-pipe FCU version
There is a further modification of this variant which is found more frequently on the market
with an electrical booster heater integrated in the fan coil unit. Only the cooled medium
then circulates through the battery and the air is heated via the heating system.
Home and Building Management Systems KNX Association
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