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• The engine has not run at least 15 seconds after starting OR
• The unit is in Pretrip OR
• There is an active shutdown alarm.
Defrost may also be initiated automatically at preset intervals by the system
defrost timer or by the defrost air switch.
Defrost mode terminates when all defrost termination temperature sensors
rise higher than 55°F (12.8°C). On remote evaporators, if the DTT is greater
than 25°F (-3.9°C) at the beginning of the defrost, then termination will occur
after the DTT rises 35°F (19.4°C) (Max 80°F) or if the EVOT rises above a
maximum threshold indicating the coil is defrosted.
Should the defrost cycle not end after a maximum of 45 minutes, the defrost
cycle is terminated automatically. “DEFROST NOT COMPLETE” will be
displayed in the MessageCenter.
If defrost terminates on the 45-minute termination timer, the system will wait
1.5 hours of compressor running time before attempting another automatic
defrost cycle. Pressing the manual defrost key will override this mode and
start a defrost cycle.
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