KNX Technical Reference Manual
ABB i-Bus
®
KNX Yucus
140
12.34.108 Alarm function – Dew point alarm
Options No
Yes
Note: Only available when the "Device function" parameter is set on either
"Single device" or "Master device" and only available when the "Control function"
parameter is set either on "Cooling", "Cooling with additional stage", "Heating and cooling"
or "Heating and cooling with additional stages".
When refrigerating machines are used, dew may appear on the refrigerant supply lines
during operation as a result of excessive cooling and/or humidity. The dew indicator
reports the dew formation via the "Dew point alarm" object (receiving only).
This causes the controller to switch to a protective mode. This status is indicated by the
corresponding symbol on devices that have a display. Local operation is blocked.
Operation is only possible again after the alarm has been deactivated.
12.34.109 Alarm function – Frost alarm temperature for HVAC and RHCC status (°C)
Options Input from 0 to 15
Note: Only available when the "Device function" parameter is set on either
"Single device" or "Master device".
The RHCC status and HVAC objects have a frost alarm bit. It the input temperature of the
controller drops below the temperature set in this parameter; the frost alarm bit is set in
the status objects. It is reset when the temperature is exceeded.
12.34.110 Alarm function – Heat alarm temperature for RHCC status (°C)
Options Input from 25 to 70
Note: Only available when the "Device function" parameter is set on either
"Single device" or "Master device".
The RHCC status object has a heat alarm bit. If the input temperature of the controller
exceeds the temperature set in this parameter, then the heat alarm bit is set in the status
object. It is reset when the temperature falls below the set temperature.
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