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Room temperature controller | Operating mode and setpoints
from" parameter to set the maximum temperature drop in K / 4 min for switch-
ing over to the frost protection mode. If the controller detects that the room
temperature has changed by at least the configured temperature jump within
four minutes, frost protection is activated. After the time specified by the "Frost
protection period" parameter has elapsed, the controller again automatically
switches to the operating mode which was set before frost protection or which
was tracked during automatic operation. It is not possible to retrigger an
elapsing frost protection period.
An activated automatic frost protection is cancelled by a setpoint shift, a set-
point change or an increase in the room temperature by 1 Kelvin.
The KNX override object has a higher priority than the automatic frost protec-
tion mode and can interrupt the latter.
The automatic frost protection mode only acts on heating for temperatures be-
low the set value temperature of the operating mode selected. Thus, no auto-
matic switchover to frost protection can take place at room temperatures in the
deadband or in the active cooling mode if the "Heating and cooling" operating
mode is on. Automatic heat protection activation is not intended with this para-
meterization.
Frequent draughts in a room can cause unintentional activation/deactivation of
frost protection when the automatic frost protection mode is active and if the
set temperature decrease is too low. Therefore switching into the frost/heat
protection mode by window contacts should generally be preferred to the auto-
matic option.
Setpoint temperature presetting
Setpoint temperatures can be specified for each operating mode in the ETS as part
of configuration. It is possible to configure the setpoints for the "Comfort", "Standby"
and "Night" modes directly (absolute setpoint presetting) or relatively (derivation from
basic setpoint). The setpoint temperatures can later be adapted during regular opera-
tion by KNX communication objects if desired.
The "Frost/heat protection" operating mode allows the separate configuration
of two temperature setpoints for heating (frost protection) and cooling (heat
protection) solely in the ETS. These temperature values cannot be changed
later during controller operation.
The "Setpoint specification" parameter on the parameter page "Room temperature
controller -> RTCx - General -> Setpoints" defines the way the setpoint temperature
is specified...
–
Setting "relative"
When presetting the set-temperatures for Comfort, Standby and Night mode,
attention has to be paid to the fact that all setpoints depend on each other as
all values are derived from the basic temperature (basic setpoint). The para-
meter "Setpoint temperature - Basic value" on the parameter page "Room
temperature controller -> RTCx - General -> Setpoints" determines the basic
setpoint, which is loaded as a preset value when the device is programmed via
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100
Page 144 of 257
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