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ABB i-bus KNX
4.1.5.4
3-pipe system,
configuration
© 2010 ABB STOTZ-KONTAKT GmbH
Planning and application
For a continuous control value (1 byte; 0...100%) the threshold values for the
fan speeds can be defined, for example, as follows:
Example
Three speed fan:
Fan speed 1: 1... 29 %
Fan speed 2: 30... 59 %
Fan speed 3: 60...100 %
The 3-pipe system has a similar design to the 4-pipe system.
There is a separate inlet for heating and cooling water as well as two
separate heat exchangers with one valve each. In contrast to a 4-pipe
system the 3-pipe system has a common return for heating and cooling
water.
The Fan Coil Actuator directly controls the fan and provides two
communication objects for control of the valves.
Switch thresholds in the FCA/S:
OFF -> Fan speed 1
Fan speed 1 -> 2
Fan speed 2 -> 3
= 1%
= 30 %
= 60 %
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