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ABB i-bus KNX
4.1.5.5 4-pipe system,
configuration
© 2010 ABB STOTZ-KONTAKT GmbH
Planning and application
In a 4-pipe system two separate heat exchangers (for HEATING and
COOLING) are available. Warm and cold water is provided centrally to two
separate pipe systems (of 2 pipes each).
The thermostat onsite decides if heating or cooling is applied. The
thermostat sends either a separate heating and cooling signal, or a common
heating/cooling signal. If only one signal is sent for HEATING and
COOLING, an additional signal decides if the system is in heating or cooling
mode and the valve that has to be controlled.
The Fan Coil Actuator directly controls the fan and provides two
communication objects for control of the valves.
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