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®
ABB i-bus
EIB / KNX
4.5
Operating mode:
"Fan coil control"
4.5.1
What is a fan coil unit?
© 2004 ABB STOTZ-KONTAKT GmbH
Project design and programming
The application provides the opportunity of controlling a fan coil air-
conditioning device.
If this operating mode is selected, this output has the master function in fan
coil control. On the one hand, it controls fans speed 1 directly while on the
other hand it controls further outputs of switch actuator modules via
communication objects which switch valves and other fan speeds. These
outputs are parameterised in the "Slave" function.
A fan coil unit consists of one or two cooling or heating circuits which are
controlled via valves. The valves are controlled via the outputs of the switch
actuator (on/off). There is also a fan which blows on the heat exchanger. It
can be controlled in stages (generally 3 speeds):
Control value
(example)
0...30%
30...60%
e.g. 60...100%
2-pipe system
With a 2-pipe system, only hot or cold water flows through the fan coil unit.
The device therefore only has one heat exchanger.
4-pipe system
In a 4-pipe system, the fan coil unit has separate connections for hot and
cold water. The device thus has two heat exchangers.
Fan speed
Output 1
Speed 1
ON
Speed 2
OFF
Speed 3
OFF
Output 2
Output 3
OFF
OFF
ON
OFF
OFF
ON
51
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