IOM 1207-6 • TRAILBLAZER
®
MODEL AGZ CHILLERS 80 www.DaikinApplied.com
Figure 67: Unit Sequence of Operation - Cool Mode (continued)
No
Maintain unit capacity
Is load satised?
Yes
Shut down last circuit.
The last circuit running now shuts down.
Maintain unit capacity.
No
Can less circuits handle
the load?
When only one compressor is running, the load may drop o to the point where even
minimum unit capacity is too much. The load has been satised when the LWT
drops below the shutdown temperature. At this time the only running circuit can
shut down.
Yes
Decrease unit capacity
All circuits o.
The unit capacity can be decreasedif the LWTis below the stage down
temperature.
Compressors will shut o as needed in the order determined by sequencing logic.
Has the stage down
Yes
time delay expired?
When last circuit has completed pumpdown, the unit will go back to waiting for
enough load to start.
No
A minimum time must pass between decreases in unit capacity.
Yes
Is unit running at
Yes
minimum capacity?
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