The universal RMU7x0B controllers are programmed with the new "H/C changeover" function block, which is used for changeover of the specified "Heating" or "Cooling" mode in 2-pipe systems.
The specified "Heating" or "Cooling" mode can be generated in the controller itself, or received as a "Heating/cooling changeover signal" over the KNX bus.
The following methods of changeover can be programmed for the specified "Heating/Cooling" mode:
Changeover via digital input, e.g. with manual switch or with a changeover thermostat in the flow (already an option with RMU7x0).
Changeover vie analog input, e.g. based on outside air temperature or flow temperature.
Changeover based on the calendar (date): Configured in the "H/C Changeover" function block (calendar symbol selected).
Changeover with operating mode selector: Configured in the "H/C Changeover" function block ("Hand" symbol selected).
Effect of specified mode
The "Heating/Cooling" mode is not affected by the type of changeover.
If several types of changeover are selected, the required operating mode is determined in the following order of priority:
Operating mode selector
H/C changeover input
Heating/cooling by calendar
The required "Heating/Cooling" mode is transmitted by the "changeover controller" to all other controllers in the heating distribution and refrigeration distribution zones.
In a hydraulic circuit, the "Heating/Cooling" mode can be defined in one location only. If several H/C changeover signals in the same distribution zone are distributed over the KNX bus, a fault message is generated.
If possible, the required "Heating/Cooling" changeover command should be activated in the primary controller or generator.
The "H/C changeover" function is activated by setting the operating line "2-pipe system heating/cooling" to "Yes".
Main menu > Commissioning > Extra configuration > Heating/cooling ch'over
|Operating line||Range||Factory setting|
|2-pipe heating/cooling system||No, yes.||No|