“I have a Bryant Evolution 48k BTU system and this carrier board worked great. Just remember to remove the model chip from your old board when you swap them for one another. If you do not install the model chip on the new board, your thermostat will not be able to automatically read the size of your outdoor unit and will not operate properly. Additionally you will see an error code 27 on the carrier board which is “improper model chip installed” or something like that. Once I got that installed the unit worked fine.”