ABB i-bus FCC/S 1 1 Series Product Manual page 101

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ABB i-bus KNX
Parameters
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7.4.1.1.1.1.3 Dependent Parameter
Type of heating/cooling system
This parameter is not visible if the Basic-stage heating or Basic-stage cooling parameters are de-
activated.
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 Via object only 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 correspond-
ingly parameterized to Automatically.
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7.4.1.1.1.1.4 Dependent Parameter
Heating/Cooling changeover
This parameter is not visible if the Basic-stage heating or Basic-stage cooling parameters are de-
activated.
Options:
The standard value for this parameter depends on the selection in the Type of heating/cooling
system parameter.
• Selection of 4-pipe:
– Automatically: If the Automatically option is selected, the changeover is only made by the
– Via object only: If the changeover is only allowed to be made centrally by a visualization or a
– Via slave and via object: The Heating/Cooling changeover and Request heating/cooling
• Selection of 2-pipe:
If 2-pipe has been selected, the standard value is set to Via object only 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 de-
vice cannot detect which situation is present, the changeover must always be made centrally
and sent to the device using a group object.
2-pipe
4-pipe
Automatically
Via object only
Via slave and via object
controller for the device depending on the setpoint temperature selected. Here the Heating/
Cooling changeover group object is hidden.
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 Via object only. The Heating/Cooling changeover group object is visible.
(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.
FCC/S 1.X.X.1 | 2CDC 508 200 D0211 Rev A 101