Sequence of Operation
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IOM 1207-6 • TRAILBLAZER
®
MODEL AGZ CHILLERS
Figure 70: Unit Sequence of Operation - Ice Mode (continued)
Yes
Is the ice cycle
complete?
No
Maintain unit capacity.
Begin normal shut down of
all circuits.
Yes
All circuits off.
All circuits begin the shut down sequence simultaneously.
When all circuits have completed shutdown, the unit will remain in the off state until
the start conditions are satisfied again.
Ice building is complete when LWT is less than the Active Setpoint.
Increase unit capacity.
If the second circuit is not running, it will be started now. The unit will try to keep
the load balanced between circuits as the unit capacity is increased.
If both circuits are running, then additional compressors will start based on the
sequencing logic.
Yes
No
Unit at full capacity?
