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The PC Station has a configuration item in the Pharos Administrator for which Devices it can release print jobs to, this is where you can tell a particular PC Station to only Device X or Y. This setting is located in the Administrator under Release Stations > [select_a_station] > at the bottom expand Printing > "Related Printers".
If the PC Station is configured with more than one device it will randomly load balance between the two devices, there is no control in this scenario unless the relationship of the Queue - Print Group - Device is a 1 to 1 to 1. Then any jobs seen at the PC Station that came into said Queue, will always go to the 1 to 1 to 1 Device in the end. This is a way to have color jobs to color Queue/Print Group end up at a color Device associated to the PC Station, then do the same configuration for a monochrome job => device.