ABB i-bus KNX Product Manual page 54

®
ABB i-bus KNX
Parameters
7.4.1.2.3 —
Dependent parameter
Heating/cooling changeover
This parameter is not visible if the Basic-stage heating or Basic-stage cooling parameters are deactivated.
Options:
The standard value for this parameter depends on the selection in the Type of heating/cooling system
parameter.
•
Selection of 4-pipe:
o
o
o
•
Selection of 2-pipe:
If 2-pipe has been selected, the standard value is set to Only via object and cannot be changed;
the related Heating/cooling changeover group object is visible. In a 2-pipe system, the same pipe is
used for the supply of hot and cold water. Because the device cannot detect which situation is
present, the changeover must always be made centrally and sent to the device using a group object.
52 2CDC508220D0211 Rev. A | VC/S 4.x.1
Automatically
Only via object
Via slave and via object
Automatically: If the Automatically option is selected, the changeover is only made by the device
controller depending on the setpoint temperature selected. Here the Heating/cooling changeover
group object is hidden.
Only via object: If the changeover is only allowed to be made centrally by a visualization or
a building management system, e.g. if the cooling equipment and heating equipment are not to
operate at the same time for energy-saving reasons, this parameter can also be changed to Only
via object. The Heating/cooling changeover group object is visible.
Via slave and via object: The Heating/cooling changeover and Request heating/cooling (master)
group objects are visible. It is possible to trigger a change between heating and cooling via the
bus using these group objects. The Request heating/cooling (master) group object is used for
connecting to a slave analog room control unit in the context of master/slave communication.