Check Evaporator Sensor Group
refrigeration
Description
After at least 48 hours off, the Evaporator Temperature Sensors differed by more than 3.6°F (2.0°C), and the unit alarms only.
Activation Conditions
The unit has been shut off for at least 48 hours. During wake up, a temperature comparison of the Evaporator Temperature Sensors (RAT, SAT, DTT) is performed. If the highest and the lowest temperature readings are more than 3.6°F (2.0°C) apart this alarm will be activated. The Evaporator Temperature Sensors test for this alarm is only run when main power is off and the unit is not running. When this alarm is in the inactive alarm list, the MessageCenter will display “Check at Next Service Interval” instead of “Status OK”
Unit Behavior
Engine and Electric Operation: Alarm only.
Reset Conditions
The system will continue to monitor the Evaporator Temperature Sensors during each wake up. If the temperature sensors read within 2.7°F (1.5°C) the alarm will clear. If the alarm doesn't clear, the alarm will be displayed as a non-shutdown alarm when the unit is powered up to alert the operator.
Corrective Actions
Refer to the manual troubleshooting procedure.