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Defrost interval
The defrost interval is an estimate of the number of hours between the start of consecutive defrost cycles. You
enter the expected defrost interval time in hours for the first defrost interval. The adaptive defrost feature shortens
or lengthens the defrost interval to reach the defrost termination temperature in the expected defrost duration. This
value provides a starting point for the adaptive defrost algorithm. If the system reaches the defrost termination
temperature before the expected defrost duration elapses, adaptive defrost lengthens the next defrost interval. If
the system reaches the defrost termination temperature after the expected defrost duration time elapses, adaptive
defrost shortens the next defrost interval.
Maximum time between defrosts
Maximum time between defrosts defines the maximum number of hours for any adaptive defrost interval. If the
system calculates a defrost interval that is greater than your defined maximum time, the controller ignores the
calculation and starts the next defrost duration at your defined maximum time.
Minimum time between defrosts
Minimum time between defrosts defines the minimum number of hours for any adaptive defrost interval. If the
system calculates a defrost interval that is less than your defined minimum time, the controller ignores the
calculation and starts the next defrost duration at your defined minimum time.
Blackout period
You can schedule a daily blackout period for adaptive defrost applications. This schedule prevents the occurrence
of defrost cycles during the defined blackout period. Blackout periods are typically scheduled for a regular,
predictable period of high cooling demand. To establish a blackout period for adaptive defrost, set up the blackout
start time and blackout parameters in the defrost setup menu flow.
• Blackout start time: This time is when the blackout period begins. The adaptive defrost algorithm does not
schedule any defrosts from the start to the end of the blackout period. Edit the real-time value to the time at
which the blackout period starts. The real-time value depends on the time format type selected in the time and
date screens in the system setup menu flow.
• Blackout duration: This duration is the number of hours that you add to the blackout start time to form the
blackout period. The blackout period refers to the time interval during which no defrosts occur. Select the
number of minutes for your preferred blackout period duration. The duration starts at the blackout start time.
Universal inputs and alarms
This section provides information about the A5xx Controller’s universal inputs and alarms.
Universal input modes
Set each of the universal inputs to one of the modes in the following table. When you select an input mode, one or
more controller actions associate with that mode.
Notes:
• The A5xx Controller defines alarm actions separately from controller actions.
• The selection of a particular input mode may affect the list of available alarms. For example, Door Open Too
Long becomes a potential alarm only after you define the input as Door Open.
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