SCS Controller - Faults and Alarms
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      AL20 - How the 'Return Air Under Temperature' alarm works

      If the cooler temperature has dropped below the normal mode setpoint by a specified amount, the SCS Controller can switch off the compressor and other outputs to protect the asset and trigger an AL20 alarm.

      Review the fault logic for the 'Return Air Under Temperature' alarm in the following graph:

      'Return Air Under Temperature' alarm