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Yes
Start first circuit.
Load/unload as needed to
satisfy load.
No
Is more capacity
needed to satisfy load?
No
Yes
Has the stage up time
*
delay expired?
Yes
*
Start next circuit.
Load/unload as needed to
*
satisfy load.
No
Can less circuits handle
*
the load?
Yes
*
Shut down one circuit.
* Les points soulignés sont pris en compte uniquement dans les unités à 2 ou 3 circuits
The first 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.
The first circuit will be loaded and unloaded as needed in an attempt to satisfy the
load by controlling LWT to the Active Setpoint.
If a single circuit is not enough to satisfy the load, additional circuits will need to be
started. An additional circuit will be started when all running compressors are
loaded to a specific capacity and the LWT is higher than the Active Setpoint plus
the Stage Up Delta T.
A minimum time must pass between the starting of circuits. The time remaining
can be viewed on the HMI if the minimum password level is active.
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.
All running circuits will now be loaded/unloaded as needed to satisfy the load.
When possible, they will load balance so that running circuits are providing nearly
equal capacity.
As the load drops off, the circuits will unload accordingly. If the LWT drops below
the Active Setpoint minus the Stage Down Delta T, one circuit will shut off. If all
running circuits are unloaded below a minimum value, this can also result in one
circuit shutting off.
A minimum time must pass between the shutting down of circuits. The time
remaining can be viewed on the HMI if the minimum password level is active.
The next circuit to shut off is generally the one with the most run hours.
D–EOMAC00A04-14_02FR - 11/64
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