Issue
Triggered an alarm for a Xenta 121 if the space temperature is too high or low from the setpoint.
Environment
Xenta 121-FC
Xenta 121-HP
Zbuilder
Cause
The Xenta 121 controller has a low spacetemp and a high space temp alarm. These alarms are triggered for the following reasons:
- Low Space temp alarm - In heating mode when space temperature is lower then Setpoint - nciSpaceTempDev
- High Space temp alarm - In Cooling mode when space temperature is higher then Setpoint + nciSpaceTempDev
These alarms can be monitored here:
- Low Space temp alarm - nvoSystemStatus bit 13
- High Space temp alarm - nvoSystemStatus bit 14
Resolution
Specify the nciSpaceTempDev by using the ZBuilder plug-in and accessing the Configuration page. On the Lon\Node screen the Space temperature deviation is editable. The default value is 3.6 deg F or 2.0 deg C.
Use a value that will not trip the alarms erroneously, but still warn if there is a problem.