How would one sequence chillers in the following way?

Chiller 1 - up to 150 tons
Chiller 2 - 150-350 tons (Chiller 1 is off in this range)
Chiller 1&2 - 350-500 tons

The Load range tab provides a "max load", but I believe that when I move to step 2 that equest is going to keep both chillers on.
i.e. for an input such as;
Chiller-Seq-Max Load
Chiller 1 - 1 - 150
Chiller 2 - 2 - 350

Should you utilize the different "Load Ranges" here?
The help file for this sections is not as robust as the other help sections.

Thank You

Joe Fleming
E.I., LEED AP BD+C, BEMP