ESIE10-01 Functional Control
Part 2 – Functional Description 2–27
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2.2.3 Unit Control States
The unit will always be in one of three states:
■ Off – Unit is not enabled to run.
■ Auto – Unit is enabled to run.
■ Pumpdown – Unit is doing a normal shutdown.
The unit should be in the Off state if any of the following are true:
■ A manual reset unit alarm is active.
■ All circuits are unavailable to start (cannot start even after any cycle timers have expired).
■ The unit mode is ice, all circuits are off, and the ice mode delay is active.
The unit should be in the Auto state if any of the following are true:
■ Unit enabled based on settings and switches.
■ If unit mode is ice, the ice timer has expired.
■ No manual reset unit alarms are active.
■ At least one circuit is enabled and available to start.
■ Low OAT Lockout is not active.
The unit should be in Pumpdown until all running compressors finish pumping down if any of the
following are true:
■ Unit is disabled via settings and/or inputs.
■ Low OAT Lockout is triggered.
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