ABB i-bus KNX Product Manual page 53

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ABB i-bus KNX
Parameters
7.4.1.2.2 —
Dependent parameter
Type of heating/cooling system
This parameter is not visible if the Basic-stage heating or Basic-stage cooling parameters are deactivated.
Options:
This parameter must be selected to suit the heating/cooling system in which the device is to be used.
It affects the changeover behavior of the device between heating and cooling.
•
2-pipe: This option is to be selected if the heating and cooling devices actuated are in a
2-pipe system. In this system, only one pipe is used to supply the device with hot and cold water.
It is therefore only ever possible to heat or cool; a changeover is necessary to change. It follows that
the device is not allowed to decide on a change between heating and cooling and the changeover
must always be made via the bus. The Heating/cooling changeover parameter is correspondingly
parameterized to Only via object and cannot be changed.
•
4-pipe: This option is to be selected if the devices actuated are in a 4-pipe system. In a 4-pipe system,
separate pipes are used for the hot and cold water supply.
It is therefore possible to change between heating and cooling at any time. In this situation the
decision can be made centrally, and also by the device. The Heating/cooling changeover parameter is
correspondingly parameterized to Automatically.
2-pipe
4-pipe
VC/S 4.x.1 | 2CDC508220D0211 Rev. A 51