When you configure Refiners webpart and if the Managed property doesn’t show in the list of available refiners make sure the Refine property is enabled in the managed property.
- Browse to central administration web site and open search service application –> Queries and Results section and click search schema.
- Search for the Managed properties
- select edit/map property
- Run Full crawl
This property will now show up on the refinement configuration dialog box.