I am trying to convert from a rheem t874r1442 thermostat to a honeywell th5000 and not all of the terminals match. Anyone know how to rewire?

Pam

Are you using this manual to install? http://www.pexuniverse.com/docs/pdf/...tion-guide.pdf This may also explain color codes on the wires. https://www.askmehelpdesk.com/heatin...eat-58313.html What type of system doyou have: boiler, forced hot air, baseboard, etc...