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Hi I'm Brian and I'm here to help!
I can certainly help with that! If you plan on "merging" the ac and heat thermostat into one, most thermostats are capable of doing that without modifying the equipment. I can help with that too but I'll need the info on your heating equipment and thermostat along with the thermostat cables that connect them.
Click Here for the IOM for your Carrier Air handler (fan coil). Pages 7-9 will be of interest to you. That covers the board and wiring diagram.
Click Here for a vendor that sells an OEM board it is Carrier part number HK61GA001A This part has been obsoleted but is still available.
Click Here for the Superseded part which is an ICM272 control board. It is a direct replacement aftermarket control.
Let me know how I can help further.
Let me know if you have further questions on this subject. Otherwise, please remember to rate before leaving (3 stars or higher please!). Bonuses are always appreciated! Thanks for allowing me to help and thanks for using Just Answer!