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My name is Billy.
The letters in the thermostat should be relatively the same. Can you tell me what terminals are currently used in the old thermostat? And have you obtained new thermostat yet?
In the furnace they are other terminals available. The wires would need to be changed inside the furnace...and possibly the ac depending on how it is wired into furnace. Can you access the furnace?
Ok, The stat wire is using only 4 wires but how many are in the cable?
In the furnace we usually have a choice of wiring r,g,y,w,c......or abcd with a communicating thermostat
Some systems are dedicated and we dont have a choice.
However you can get a communicating Carrier thermostat that uses a,b,c,d and is wifi.
Just Google Carrier (or Bryant) wifi communicating thermostats. These will be a direct changeout with the a,b,c,d terminals.
Your board has a 3 amp fuse to protect low voltage shorts.
AND you turn power off when swapping thermostats. The only damage on an infinity unit would be blowing the 3 amp fuse next to the led light on the circuit board..
Plus if you have issues just return here...once you rate service (5 star system) you have 30 days of follow up.