Art. No. ..5192KRMTSD
Art. No. ..5194KRMTSD
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 the switchover by the corresponding operating mode switchover
object or by room temperature controller operation on the TSM (button function), the frost/heat
protection mode can by activated by a window contact or, alternatively, frost protection can be
activated by an automatic temperature control option. With these options, the window contact or
the automatic function has higher priority. You can use the "frost/heat protection" parameter in
the "room temperature control -> controller general" parameter branch to set the way how such
higher-priority switch-over will take place...
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Frost/heat protection switch-over "via window status"
The 1-bit object, "window status" is enabled. A telegram having the value of = "1" (open
window) and sent to this object will activate the frost/heat protection mode. If this is the
case, the operating mode cannot be deactivated, neither by local operation nor by the
switch-over objects (with the exception of the KNX override object). Only a telegram with
the value of = "0" (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 parameterise a window status delay. This delay can make sense if short
ventilation of the room by opening the window is not supposed to cause an operating mode
switchover. You can use the "window status delay" parameter to set this delay time
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. The value
of the object "window status" is deleted after a reset.
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Frost protection mode switch-over by "automatic frost protection"
For this setting, automatic switch-over 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 the room when windows or external doors
are open. In connection with this function, a quick temperature drop can be detected by
measuring the actual temperature every minute as, for example, is the case when a
window is open. If the temperature decrease detected reaches a parameterised value the
room temperature regulator will automatically switch over to the frost protection mode. You
can use the "automatic frost protection temperature drop" parameter to set the maximum
temperature drop in K/min for switching over to the frost protection mode. After the time
preset by the "frost protection period in automatic mode" parameter has elapsed, the
regulator will return into the mode which was set before frost protection. Re-triggering will
not be possible.
If a new operating mode was received during the frost protection when switching over by
1-byte via the KNX switch-over object, this tracked mode is set according to the automatic
frost protection. If a switch-over was made by 4 x 1 bit during frost protection via the
change-over object, then this newly received mode will be discarded after the end of the
automatic frost protection. The controller then remains in frost protection. Only after that
can the operating mode be switched over by the objects or locally on the device. The KNX
override object has a higher priority than the automatic frost protection mode and can
interrupt the latter.
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The automatic frost protection mode only acts on heating for temperatures below the set
value temperature of the operating mode selected. Thus, no automatic switch-over to frost
protection can take place at room temperatures in the dead band or in the active cooling
mode if the "heating and cooling" operating mode is on. Automatic heat protection
activation is not intended with this parameterization.
Page 120 of 309
Software "Room controller display compact module 146x11"
Functional description
