ABB i-bus
®
KNX
Parameters
FCC/S 1.X.X.1 | 2CDC 508 200 D0211 Rev A 134
7.4.1.2.1.1.12.1
—
Dependent Parameter
Dew point reached when
Options:
Object value = 0
Object value = 1
This parameter is used to select which object value is to be considered dew point reached on re-
ception.
•
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 cool-
ing 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 de-
vice continues to operate normally because the dew point only relates to the cooling and heating
counteracts the dropping below the dew point temperature.
Note
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.
