ABB i-bus KNX Product Manual page 61

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ABB i-bus KNX
Parameters
7.4.1.4.1 —
Dependent parameter
Dew point reached when
Options:
This parameter is used to select which object value is to be considered dew point reached on reception.
•
Object value = 0: On the reception of the object value 0, it is evaluated as the "Dew point alarm"
status. Reception of the object value 1 signifies "No dew point alarm".
•
Object value = 1: On the reception of the object value 1, it is evaluated as the "Dew point alarm"
status. Reception of the object value 0 signifies "No dew point alarm".
The controller reacts to the reception of the "Dew point alarm" status with the shutdown of the cooling and
a changeover to Building Protection mode. This mode applies until the dew point alarm is cleared.
However, a change to the heating mode (if possible) is allowed at any time. Here the device continues to
operate normally because the dew point only relates to the cooling and heating counteracts the dropping
below the dew point temperature.
The dew point (or dew point temperature) is the temperature below which condensation is formed. At this
temperature the relative humidity is 100 %. The air can therefore not absorb any moisture. Due to the
formation of condensation, the building may be damaged (damp/formation of mold).
The dew point can be calculated based on the temperature and moisture values or measured by
a sensor.
To prevent dropping below the dew point, the cooling must be reduced or stopped.
Object value = 0
Object value = 1
Note
VC/S 4.x.1 | 2CDC508220D0211 Rev. A 59