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Room temperature controller | Operating mode and setpoints
After the delay time has elapsed in the presence detector after a detected
movement ("OFF" telegram), the controller will return to the mode which was
active before presence detection, or it will compensate the telegrams of the
operating mode objects received during presence detection, respectively.
In the event of a device reset (voltage failure, ETS programming operation), an
active presence function is always deleted. In this case, the presence detector
must transmit a new "1"-telegram to the controller to activate the presence
function.
Additional information on the window status and the automatic frost protection
The room temperature controller offers various options to change over into the Frost/
heat protection mode. In addition to switching over by means of the corresponding
operating mode switchover object, frost/heat protection can be activated by a window
contact, or alternatively, the frost protection can be activated by an automatic temper-
ature function. The window contact or the automatic function has higher priority. The
"Frost/heat protection" parameter determines how the switchover to forced frost/heat
protection takes place:
–
Frost/heat protection switchover "via window contact (frost and heat protec-
tion)"
The 1-bit object "Window contact" is enabled. A telegram having the value of =
"ON" (open window) and sent to this object will activate the frost/heat protec-
tion mode. If this is the case, the operating mode cannot be deactivated by the
switchover objects (except for the KNX forced object) or the presence function.
Only a telegram with the value = "OFF" (closed window) will reset the window
status and deactivate the frost/heat protection mode. After this, the operating
mode set before the opening of the window or that mode carried by the bus
while the window was open will be activated.
You can optionally configure a delay for the evaluation of the window status.
Such delay can make sense if short ventilation of the room by opening the
window is not supposed to change the operating mode. The delay time is set
by the "Delay time" parameter and can be between 1 and 255 minutes. The
window status will only be changed and thus the frost/heat protection mode
activated after this parameterized time has elapsed. A setting of "0" will effect
the immediate activation of the frost/heat protection mode when the window is
open. The window status will be in effect in the heating and in the cooling
mode. After a voltage failure or ETS programming operation, the window
status is always inactive.
–
Frost protection mode switchover "via temperature drop (frost protection only)"
For this setting, automatic switchover to the frost protection mode can be
made at times, depending on the room temperature determined.
If there are no window contacts, this setting can prevent unnecessary heating
up of a room when windows or external doors are open.
With this function, a quick temperature drop can be detected by measuring the
actual temperature every 4 minutes as is the case when a window is open in
the winter months, for example. You can use the "Temperature drop detection
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100
Page 143 of 257
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