OpenStudio AirChiller Measures & Defrost Schedules

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I'm working on modeling a refrigerated warehouse in OpenStudio, and I'm trying to implement a RefrigerationAirChiller per this older post.

RefrigerationAirChiller.new() requires two arguments, the second of which is a schedule. What's the best way to approach inputting an appropriate defrost schedule for this object? I've tried creating a drop-down style menu but haven't had success getting the existing schedules in the model to appear.

This is my first experience with measure-writing or editing, so any help is appreciated.