Art. No. SC 1000 KNX
"Heating and cooling" mixed operating mode
In the "Heating and cooling" mixed operating mode, the controller is capable of triggering
heating and cooling systems. In this connection, you can set the change-over behaviour of the
operating modes...
-
"Change-over between heating and cooling" parameter in the "Room temperature control
-> Controller general -> Setpoints" parameter branch set to "Automatic".
In this case, a heating or cooling mode will be automatically activated, depending on the
room temperature determined and on the given temperature basic setpoint, or on the
deadband, respectively. If the room temperature is within the preset deadband neither
heating nor cooling will take place (both command values = "0"). If the room temperature is
higher than the cooling temperature setpoint cooling will take place. If the room
temperature is lower than the cooling temperature setpoint heating will take place.
When the heating/cooling operating mode is changed over automatically, the information
can be actively sent to the bus via the object "Heating/cooling change-over" to indicate
whether the controller is working in the heating mode ("1" telegram) or in the cooling mode
("0" telegram). In this connection, the "Automatic heating/cooling change-over
transmission" parameter specifies when an operating mode change-over will be
transmitted...
Setting "On changing the operating mode": in this case, a telegram will be transmitted
solely on change-over from heating to cooling (object value = "0") or from cooling to heating
(object value = "1"), respectively.
- Setting "On changing the output command value": with this setting, the current operating
mode will be transmitted whenever there is a modification of the output command value. If
the command value = "0" the operating mode which was active last will be transmitted. If
the room temperature determined is within the deadband, the operating mode activated last
will be retained in the object value until a change-over to the other operating mode takes
place, if necessary. In addition, the object value can be output in cycles when automatic
switch-over is being made.
The "Cyclical transmission heating/cooling change-over" parameter enables cyclic
transmission (factor > "0" setting) and specifies the cycle time.
With an automatic operating mode change-over, it should be noted that under certain
circumstances there will be continuous change-over between heating and cooling if the
deadband is too small. For this reason, you should, if possible, not set the deadband
(temperature difference between the setpoint temperatures for the comfort heating and
cooling modes) below the default value (2 K).
Page 168 of 347
Software "Smart Control 501511"
Functional description