seqUenCe of operaTIon
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MODEL AGZ CHILLERS
Figure 48: Unit Sequence of Operation - Cool Mode (continue)
Yes
Start rst circuit.
Additional capacity
needed to satisfy load?
Yes
No
Has the stage up time
delay expired?
No
The rst circuit to start is generally the available circuit with the least number of
starts. This circuit will go through its start sequence at this point.
Maintain unit capacity.
A minimum time must pass between the starting of circuits.
Yes
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.
The unit capacity can be increased if the LWT is above the stage up temperature.
No
Is there enough load to
start chiller?
If both circuits are running, then additional compressors will start based on the
sequencing logic.
Keep pump output on while
chiller is enabled and either
running or ready to run.
The chiller is now ready to start if enough load is present. If the LWT is not higher
than the start up temperature, the unit status will be Auto:Wait for load.
If the LWT is higher than the start up temperature, the unit status will become
Auto. A circuit can start at this time.
Unit at full capacity?
No
Yes
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