McQuay AGS 225D User Manual

12 OM AGSD-1
Is more capacity
needed to satisfy load?
Has the stage up time
delay expired?
Start next circuit.
Yes
No
Load/unload as needed to
satisfy load.
Yes
No
Load/unload as needed to
satisfy load.
Can less circuits handle
the load?
Yes
Shut down one circuit.
No
Load/unload as needed to
satisfy load.
Is load satisfied?
No
Shut down last circuit.
Yes
The first circuit will load and unload as needed in an attempt to satisfy the load. It
will eventually get to a point where it is considered to be at full load. A circuit is at
full load when it reaches 75% slide target, it reaches the max slide target setting, or
it encounters a problem and is running in an inhibited state.
A minimum time must pass between the starting of circuits.
As the load drops off, the circuits will unload accordingly. If the LWT gets low
enough, or all running circuits unload enough, one circuit can shut off. This can
occur with either two or three circuits running.
When only one circuit is running, the load may drop off to the point where even
minimum unit capacity is too much. The load has been satisfied when the LWT
drops below the shutdown point. At this time the only running circuit can shut down.
All running circuits will now load/unload as needed to satisfy the load. In addition,
they will load balance so that both circuits are providing nearly equal capacity.
The second circuit will go through its start sequence at this point.
Note that a third circuit can be started if available. The two preceding conditions
must again be satisfied after starting the second circuit before starting the third
circuit.
The next circuit to shut off is generally the one with the most run hours.
The remaining running circuit(s) will load/unload as needed to satisfy the load.
The last circuit running now shuts down.
The unit should be ready to start again when the LWT gets high enough. The unit
status at this time will be
Auto:Wait for load .
If a single circuit is not enough to satisfy the load, additional circuits will need to be
started.

McQuay AGS 225D Specifications

General

Brand	McQuay
Model	AGS 225D
Category	Air Compressor
Language	English