Applicatio Manual
Universal Interface 4 DIN/NTC EK- CG2-TP
Revisione 1.0.0 - Aggiornato: 04/09/2017
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MAEKCG2TP_EN
Pag. 62
2b
Active
Anticondensation protection
with comparison between
flow temperature (constant
projected value, set as
parameter on ETS and
dewpoint temperature
(calculated by the thermostat)
Software protection that intervenes by closing down the room cooling circuit
when the actual measured flow temperature and received via bus from a
different KNX device is lower than dew-point temperature calculated by the
room thermostat using temperature and relative humidity values. The
communication objects involved are 21 at input: Flow temperature (from bus)
[DPT 9.001 temperature °C] and 45: Cooling out command [DPT 1.001 switch].
3
Active
Anticondensation protection
with dew-point temperature
sending over the bus and
adjustment of the flow
temperature
Software protection that foresees the sending on the bus of the dew-point
temperature calculated by the room thermostat using temperature and relative
humidity values to a KNX device capable of controlling the mixing condition of
the conveying fluid for the cooling circuit. The regulation is performed by the KNX
device receiving the dew-point temperature sent by the thermostat. The
communication object involved is 59: Dew-point temperature [DPT 9.001
temperature °C].
Anticondensation protection modes
If an anticondensation sensor is used, it is necessary use a device provided with a potential-free signalling contact. It is
possible to connect the signalling contact to an input channel of another KNX device, e.g. a pushbutton interface or a
binary input (External sensors (from bus) Anticondensation sensor = enabled). In this case the signal of the sensor is
transmitted to the room temperature controller through the status of a communication object (case 1b of the table).
If the comparison between dew-point temperature calculated by the thermostat and flow temperature of the conveying
fluid is used, there are 3 options:
•
if the flow temperature value is not available (case 2a of the table), you can insert the value used in the project
(parameter Flow temperature (projected));
•
if the flow temperature value is available (case 2b of the table), you enable the Anticondensation Active
parameter for comparison;
•
if an bus actuator capable of intervention on the conveying fluid’s mixing is available, the thermostat sends on
the bus the calculated value of the dew-point temperature; the actuator compares this value with the flow
temperature and, if necessary, modifies the mixing conditions in order to prevent the risk for condensation
formation.
The proper anticondensation protection mode needs to be evaluated during the thermical plant design and depends on
many factors such as type of building, continuity of service and desired comfort level, available KNX devices, and so on.
