Honeywell Rth8500 Wiring Diagram

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Honeywell rth8500 wiring diagram - i replaced a white rogers thermostat type 1f80 51 with a honeywell rthl221 ithe wr thermo was a four wire white green red yellow with a jumper from red to redc the b and o were blank thermostat wire es in various weights if you have heat and ac you ll need 18 5 if you ve only got heat 18 3 is sufficient but you may want to run 18 5 anyway for a bit of future proofing