The Available Modes Set Point must only be changed when the unit switch is off. This is to avoid changing modes of
operation inadvertently while the chiller is running.
Unit Mode is set according to the following table.
NOTE: An “x” indicates that the value is ignored.
7.4.1 Glycol Configuration
If the Available Modes Set Point is set to an option w/Glycol, then glycol operation is enabled for the unit. Glycol operation
must be disabled only when the Available Modes Set Point is set to Cool.
7.5 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 will 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 will 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
The unit will 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 in section 7.2
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