How to Model a Two Compressors Chiller

Recently, I'm modeling a two compressors chiller by EnergyPlus. After reading all the relevant documents, I still did't find anything about multiple compressors. Based on my understanding, the capacity will be changed when the number of working compressors changes. But it will be hard to change the capacity curve in this situation. Does anyone know anything about it? Thanks!

Hi. All the data that I have from commercial manufacturers related to chiller performance with two compressors reflects the performance of the unit as a whole. My opinion is that you have two options:

Look for the manufacturer data to check if you can build energy consumption, efficiency and capacity curves which reflects the performance of the chiller as a single unit with two compressors.
Model two chillers in series with curves for each one. Curves can be equal or different, depending on manufacturer data.